"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:a16f8f3f-6dd2-4700-89d1-93c89a65aee8","http://resolver.tudelft.nl/uuid:a16f8f3f-6dd2-4700-89d1-93c89a65aee8","Developing a Model to Study the Climate Change Impact on River Bifurcations in Engineered Rivers","Chowdhury, M. Kifayath (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2024","Climate change is responsible for global shifts in precipitation patterns and an overall in-crease in global temperatures. The transi-tions are anticipated to modify the river hydro-graph and sea level. The changes to the hy-drograph are also likely to influence sediment flux. These alterations imply shifts in both up-stream and downstream boundaries for river bifurcations. However, the resulting bifurca-tion response remains uncertain and warrants further investigation. Our objective is to un-derstand the extent of large-scale and long-term response of river bifurcations to climate change. We take the Upper Dutch Rhine bifur-cation region as our case study and develop a 1D hydro-morphodynamic model representing the system to achieve this goal.","river bifurcation; Rhine River; climate change; long term morphological change; Pannerdense Kop","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:4e37e532-a378-4b02-935a-af24b45d6088","http://resolver.tudelft.nl/uuid:4e37e532-a378-4b02-935a-af24b45d6088","A Field Study on Groyne Field Nourishments","Liptiay, E.J.A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)","","2024","Over the past century, the main channel of the Waal has experienced erosion of approx-imately 1-2 metres (Ylla Arb´os et al., 2021; Chowdhury et al., 2023). This erosion leads to various problems such as instability of struc-tures or disruption to shipping. To address this ongoing degradation, a potential solution is the implementation of sediment nourishments.
Recent pilot studies have been conducted in 2016 and 2019 to investigate the feasibility of using sediment nourishments in the main channel of the Dutch Rhine (Becker, 2023). Another possibility of nourishing is to add sed-iment to the groyne fields. Under the influence of currents and ship waves, sediment is ex-pected to be transported to the main channel, causing a groyne field to act as a sand mo-tor. To explore this concept, Rijkswaterstaat initiated a pilot project with sediment nourish-ments in three groyne field clusters along the Waal during the fall of 2023. The pilot includes an extensive measurement campaign.","groyne fields; sediment nourishments; river morphology","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:bb531b96-76c8-499c-bc76-e49002f01190","http://resolver.tudelft.nl/uuid:bb531b96-76c8-499c-bc76-e49002f01190","Accuracy of Numerical Morphological Models based on Simplified Hydrodynamics","Barneveld, H.J. (Wageningen University & Research; HKV Lijn in Water); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chavarrías, V. (Deltares); Hoitink, A.J.F. (Wageningen University & Research)","","2024","Sustainable river management often requires long-term morphological simulations. As the future is unknown, uncertainty needs to be accounted for, which may require probabilistic simulations covering a large parameter domain. Even for one-dimensional models, simulation times can be long. One of the acceleration strategies is simplification of models by neglecting terms in the governing hydrodynamic equations. Examples are the quasi-steady model and the diffusive wave model, both widely used by scientists and practitioners. We established under which conditions these simplified and often more efficient models are accurate.","Numerical modelling; Morphology; Stability Analysis","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:99debde4-f429-47a1-9858-ada00c3e94f8","http://resolver.tudelft.nl/uuid:99debde4-f429-47a1-9858-ada00c3e94f8","Flow partitioning between branches of the Karnali river in Nepal","Gautam, K. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Wolf, M.E. (TU Delft Civil Engineering & Geosciences); Bogaard, T.A. (TU Delft Water Resources); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2024","The dynamics of the bifurcating Karnali river in the western plains of Nepal and India is governed by the geomorphological processes in an alluvial fan. The dynamic branches showcase a notable degree of braiding, dominant channel switching and unequal discharge partitioning. Since recent switching of the dominant channel of Karnali system occurred after an intense monsoon in 2009, the eastern Geruwa branch of the system, which used to be dominant channel passing through the Bardiya National Park, is now receiving a lower share of discharge. This situation exacerbates in the low flow periods when there is very small flow in the Geruwa branch. This decreasing discharge has been associated with depleting diversity of wildlife habitat in Bardiya National Park (Bijlmakers et al., 2023). For sustainable habitat management in the Bardiya National Park, there is a necessity to study the dynamic Karnali river and its two branches, the eastern Geruwa branch and the western Kauriala branch. Activities such as sediment mining, construction of irrigation and hydropower and inter-basin water transfer projects will potentially influence the system dynamics. Our objective is to understand the switching behaviour of the Karnali system to the natural dynamics such as bend sorting (Baar et al., 2020; Parker & Andrews, 1985) of sediments at the location where water from the main Karnali enters the Geruwa branch, and offer understanding of system response to human interventions especially with regards to the distribution of discharge between the Geruwa and Kauriala branches. We combine the technique of field observations and numerical modelling to study the system.","river bifurcation; field observation","en","abstract","","","","","","","","","Civil Engineering & Geosciences","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:629471af-0673-44b0-95ac-10c269f46c67","http://resolver.tudelft.nl/uuid:629471af-0673-44b0-95ac-10c269f46c67","Using an idealized network model as the physical module for a salt intrusion serious game","den Haan, Robert-Jan (University of Twente); Biemond, Bouke (Universiteit Utrecht); Baart, F. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)","","2024","Salt intrusion is a growing problem in many deltas around the world. During periods with low river discharges, salinity upstream in a delta increases and affects freshwater availability, ecology, and other delta functions. For example, in the Rhine-Meuse estuary (the Netherlands), brackish water can reach drinking water intakes about 40 km from the estuary mouth during droughts. Salt intrusion is likely to become more severe in the context of climate change, as a result of sea level rise and a lower river discharge during droughts.
The challenges with salt intrusion for the Netherlands are addressed in the Salti Solutions research program. Within this program the Delta Management Game offers an interactive environment where policy-making stakeholders can experience salt intrusion management and experiment with adaptation and mitigation strategies in the Rhine-Meuse estuary. As a serious game, the goal is for players to “learn by taking actions and by experiencing their effects through feedback mechanisms that are deliberately built into and around the game” (Mayer, 2009, p. 825).
A particular design challenge for serious games is simplifying the environmental system and sufficiently representing the relevant physics, while offering exploratory and experimentation through (near-)instant, interactive feedback. The physical module for salt intrusion in the Delta Management Game should be able to deal with, among others, changes in bathymetry (e.g. depth or width of waterways, adding a sill) of the estuary in the game, while offering relatively quick feedback.","Idealized modelling; Serious game; Salt intrusion; Climate change","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:7721b745-fcd1-46d0-a90c-026364ddb557","http://resolver.tudelft.nl/uuid:7721b745-fcd1-46d0-a90c-026364ddb557","Flow-induced fragmentation and mixing of eDNA for river biodiversity assessment","Dercksen, J.A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Stancanelli, L.M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Trimbos, Krijn B. (Universiteit Leiden); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2024","River restoration is an established method for the rehabilitation of river ecosystems in order to combat the current declines of freshwater biodiversity (Wohl et al., 2005; WWF, 2022). The urgency of restoration is recognized internationally, as the IUCN has proclaimed 2021-2030 to be the ‘Decade on Ecosystem Restoration’ (Cooke et al., 2022). So far only few restoration projects have been evaluated based on monitoring data (England et al., 2021), and there is a need for monitoring techniques to assess restoration practices.
The analysis of environmental DNA (eDNA) has gained popularity in the last decades, as it allows for rapid standardized biomonitoring across the tree of life, requires a reduced dependence on taxonomic expertise for species identification, and it is cheaper than traditional monitoring methods. Depending on the organism, eDNA is shed by its host in forms such as mucous, shed skin cells, and faeces. After release, eDNA is exposed to a wide spectrum of environmental variables that may impact its state, transport capacity, fate, and the subsequent inference made by the practitioner (Barnes and Turner, 2016). Our objective is to study how eDNA quantities are affected by flow and sediment transport in river ecosystems.","environmental DNA; biomonitoring; fragmentation","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:a6969f0a-c0b9-43f3-baec-4f40b4fa8a19","http://resolver.tudelft.nl/uuid:a6969f0a-c0b9-43f3-baec-4f40b4fa8a19","Mitigation of Channel Bed Erosion through Floodplain Lowering and Nourishments","Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat); van Vuren, Saskia (Rijkswaterstaat); Snoek, Yvo (Rijkswaterstaat); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2024","Channel adjustment in engineered rivers is often associated with channel bed incision (e.g., Chowdhury et al., 2023, Czapiga et al., 2022a, 2022b, Ylla Arbós et al., 2021). Channel bed incision reduces the stability of in-river structures, exposes river-crossing cables and pipelines, and the spatial variability of channel bed incision due to less erodible reaches creates shipping bottlenecks.
Various measures have been implemented to cope with these issues. They range from sediment nourishments to erosion control structures (e.g., Habersack and Piégay, 2007). Our objective is to assess the potential of floodplain lowering and sediment nourishments in mitigating large-scale channel bed incision in engineered rivers affected by climate change, considering a spatial scale of hundreds of kilometres. Our domain of interest is the Rhine River between Bonn, Germany, to Gorinchem, Netherlands. This reach has been extensively channelized during the 18th-20th centuries for improved navigation and flood protection (e.g., Ylla Arbós et al., 2021).","channel bed erosion; erosion mitigation; nourishments; numerical modelling","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:5cb0750c-9946-4bdc-acd4-6f3d8f7e240d","http://resolver.tudelft.nl/uuid:5cb0750c-9946-4bdc-acd4-6f3d8f7e240d","Approaches reproducing suspended sediment transport through vegetation","Liu, J. (TU Delft Water Resources; IHE Delft Institute for Water Education); Bregoli, Francesco (IHE Delft Institute for Water Education); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education); Calvani, Giulio (École Polytechnique Fédérale de Lausanne)","","2024","Working as natural filter, well-designed vegetation schemes have been widely applied to improve the quality of water (Aiona, 2013; Stefanakis, 2015). Proper design, however, requires appropriate physics-based modelling of their filtering capacity. Several theoretical models predicting sediment transport in vegetated flow have been proposed: Baptist (2005); Yang and Nepf (2018); Wu et. al. (2021); Tseng and Tinoco (2021); Yagci and Strom (2022); Wang et. al. (2023). Some of them have been implemented in numerical tools (e.g. Caponi et al., 2022; Li et al., 2022) and in particular in Delft 3D (Deltares, 2014). However, they have been mostly designed and verified based on bedload processes, and their performance for suspended load should be further investigated.
This work compares different approaches on their ability to reproduce the effects of vegetation on suspended solids concentration in two-dimensional models built in Delft3D. The work focuses on emerging vegetation, represented as rigid cylinders, and sediment deposition. Comparisons are based on the ability to reproduce flume experiments available in the literature by analysing both flow field and sediment deposition results.","suspended sediment transport; Delft 3D","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:dc5f443d-540c-4451-9e41-529d319cd1e2","http://resolver.tudelft.nl/uuid:dc5f443d-540c-4451-9e41-529d319cd1e2","ResiRiver - Mainstreaming and Upscaling Nature Based Solutions in North West European Rivers","Wilson, Stanford (Rijkswaterstaat); Rem, Nils (Rijkswaterstaat); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat); Snoek, Yvo (Rijkswaterstaat)","","2024","River managers today are faced with the challenge of adapting to climate change while also having to sustainably secure all important functions in a healthy river system for society. Nature-based Solutions (NbS) have proven themselves effective across a multitude of contexts; providing integrative approaches for river restoration, conservation and sustainable management, ensuring both climate change adaptation and contribute to climate change mitigation and biodiversity recovery for generations to come. NbS are multi-faceted and more importantly, they are effective when it comes to addressing complex societal challenges (e.g. reducing flood risk, increasing natural values and biodiversity, ecosystem services and human well-being), as they provide a novel, integrative and coherent approach. Despite the significant and rapidly growing base of scientific evidence regarding the effectiveness of NbS in riverine systems management, the actual uptake and application of NbS on a larger (EU) scale is still in its early phase. From where we stand today, a major barrier to the wider uptake and application of NbS in riverine systems remains (a) our limited experience in scaling solutions beyond their local contexts (so called ‘Upscaling’), and (b) make Nbs as a standard work practice within water management organisations throughout North-West Europe (so called ‘Mainstreaming’). Also, our lack of standardised methods for quantitative assessment and monitoring of ecosystem services and benefits related to NbS hinders replication and application at a wider scale.","nature based solutions; assessment frameworks; international cooperation","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:33e4fff4-45ce-4bde-b007-563a274021ea","http://resolver.tudelft.nl/uuid:33e4fff4-45ce-4bde-b007-563a274021ea","Evaluating the impact of Room for the River flood management measures on vegetation health and diversity in the Netherlands via optical remote sensing","Spriggs, A.M.S. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat); Stancanelli, L.M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2024","Recent policy initiatives in Europe emphasize a movement towards nature-based solutions in flood management; however, a quantitative relationship between specific flood management measures and indicators of ecological health and biodiversity is difficult to establish (Penning et al., 2023). In the Netherlands, several studies have been conducted on floodplain vegetation monitoring; however, these studies are primarily focused on monitoring changes to hydraulic roughness for flood risk assessment (Harezlak et al., 2020; Penning & van de Vries, 2020). These works provide an opportunity to expand upon existing research to explicitly connect river management practices with indicators of floodplain biodiversity change in the Netherlands.
In this study, we utilize publicly available geospatial data to identify changes in land use, vegetation classification and spectral indicators of vegetation health at restoration sites associated with the Room for the River (RftR) program in the Netherlands. Completed in 2018, RftR involved over 30 river management projects constructed to reduce flood risk by lowering peak water levels (Mosselman, 2022).
Our objective is to quantify the impact of ecologically focused RftR projects on habitat heterogeneity and river connectivity in the surrounding floodplains.","river restoration; remote sensing; GIS; biodiversity; Normalized Difference Vegetation Index (NDVI); vegetation classification","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:28bfdc09-6454-4fad-acce-26e7fe7ed1e7","http://resolver.tudelft.nl/uuid:28bfdc09-6454-4fad-acce-26e7fe7ed1e7","On the factors governing river morphology with a look on how rivers adapt to climate","Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education)","","2024","River morphology can be described at different scales: at the basin scale we distinguish the river network; at the reach scale the planform, the slope and average features, such as the width and bankfull water depth; at the cross-section scale the transverse variations of river bed topography; and at smaller scales we observe bedforms and sediment grains. What are the factors that influence the river mophology at the different scales? Does climate govern these factors and if climate changes, how does the river react?
This review addresses these important questions, focusing at the reach and cross-section scales. Important knowledge gaps are related to the channel width formation, a key factor for river morphology. Several predictors based on field data relate the equilibrium width to bankfull discharge, sediment size, vegetation and bank resistance. However, it is not clear if the river width also depends on the conditions at the start of the morphological process. An example are rivers that adapt their morphology after their water and sediment discharge regimes have been altered by an external factor, such as a dam of a change in climate. Does the morphology of these rivers depend also on their previous width?","river morphology; channel width; adaptation to climate","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:af2cf549-dd3d-4ee4-91be-722551118409","http://resolver.tudelft.nl/uuid:af2cf549-dd3d-4ee4-91be-722551118409","Towards a robust and well-functioning Rhine River system that can sustainably provide its geo-ecosystem services","Klijn, F. (TU Delft Policy Analysis; Deltares)","","2024","The policy programme Integrated River Management (IRM) aims to anticipate climate change and to redress the negative consequences of earlier river engineering interventions. Its objective is to first and foremost ensure a well-functioning river system that can provide its essential ‘public’ geo-ecosystem services: safe discharge of floods, reliable freshwater supply, reliable waterways to the hinterland, and good conditions for aquatic and terrestrial ecosystems in the floodplains and beyond. Challenges, however, relate to the changing discharge regime resulting from climate change, and to the conflicting requirements of the various river functions and values. These pose real dilemmas about when to act, how to act, which function or value to support and which one to curb.","Robustness; Discharge capacity; Transformation","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:94b8d501-7ad8-4077-b3c1-620df02a5a27","http://resolver.tudelft.nl/uuid:94b8d501-7ad8-4077-b3c1-620df02a5a27","Oil Spaces: Extended Urbanization from Sea to Land","Hein, C.M. (TU Delft History, Form & Aesthetics)","","2024","Flows of petroleum have shaped buildings, cities and landscape around the world on sea and land. This paper shows how industrially drilled petroleum and its refined products have played a major role in transforming the built environment over the last century and a half, in ways that are often not visible or recognized. Understanding the multiple links between refineries, gas stations, headquarters or cities around the world, and acknowledging the path dependencies that these flows have created, provides a concrete example for extended urbanization and its role in fueling ways of life and visions of progress, modernity, and disaster.
Through detailed international case studies the paper considers petroleum’s role in the development of the built environment and the imagination. It explores how petroleum and its infrastructure have served in shaping extended urbanization as a source of military conflict and political and economic power, inspiring efforts to create territories and reshape geographies and national boundaries. The paper explores ruptures and continuities between colonial and postcolonial frameworks through diverse case studies with diverse functions from around the world, including heritage sites.
By revealing petroleum’s role in organizing and imagining space globally, this paper takes up a key task in imagining the possibilities of a post-oil future. It explores diverse contributions made by students in courses at Delft University of Technology to show visualize them.","petroleumscape; history of urbanism; post-oil futures; extended urbanization","en","abstract","","","","","","","","","","","History, Form & Aesthetics","","",""
"uuid:22163f75-f825-4257-9cf4-7f1c479da4ad","http://resolver.tudelft.nl/uuid:22163f75-f825-4257-9cf4-7f1c479da4ad","Response of Late-Eocene warmth to incipient glaciation on Antarctica","Vermeulen, D.H.A. (TU Delft Environmental Fluid Mechanics); Baatsen, Michiel (Universiteit Utrecht); Heydt, Anna von der (Universiteit Utrecht)","","2024","The Eocene-Oligocene Transition is marked by a sudden δ18O excursion occurring in two distinct phases: a precursor event at 34.15±0.04 Ma and the Earliest Oligocene oxygen Isotope Step at 33.65±0.04 Ma. These events signal a shift from the warm Late-Eocene greenhouse climate to cooler conditions, with temperature decreases of 3-5 °C, and the emergence of the first continent-wide Antarctic Ice Sheet (AIS). Despite clear evidence from proxy data, general circulation models (GCMs) struggle to replicate this Antarctic transition accurately, failing to capture the shift from warm, ice-free to cold, glaciated conditions. Even with unrealistically low pCO2 levels, Late-Eocene Antarctic summers in GCMs remain too warm and moist for snow or ice to survive. This study evaluates CESM1.0.5 simulations conducted by Baatsen et al. (2020), using a 38 Ma geo- and topographical reconstruction, considering different radiative (4 pre-industrial carbon levels (PIC) and 2 PIC) and orbital (present-day insolation and low Antarctic summer insolation) forcings. The climate is found to be highly seasonal, characterised by hot and wet summers and cold and dry winters. While reduced radiative and summer insolation forcing weaken this seasonality, the persistent atmospheric circulation still impedes ice sheet growth by limiting summer snow survival. For that reason, a new simulation is conducted with regional, moderately-sized ice sheets imposed on the continent, in order to investigate their stability and their influence on the atmospheric circulation. These ice sheets demonstrate self-sustaining and even expansion potential under 2 PIC and low summer insolation conditions. However, correlating resulting temperature and precipitation patterns with proxy data proves challenging, given the absence of terrestrial proxies. Extended simulations with coupled GCM-ISM models are therefore recommended, allowing for more dynamic atmosphere-ice-ocean-vegetation feedback mechanisms and dynamic radiative and orbital forcing.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:e9f85596-f8eb-415e-873f-d62683515103","http://resolver.tudelft.nl/uuid:e9f85596-f8eb-415e-873f-d62683515103","Where does the AMOC peak? Assesssing regional variations in North Atlantic Overturning from GLORYS12 ","Katsman, C.A. (TU Delft Environmental Fluid Mechanics); Oldenhuis, D.J. (TU Delft Civil Engineering & Geosciences); Vermeulen, D.H.A. (TU Delft Environmental Fluid Mechanics); Gelderloos, R. (TU Delft Environmental Fluid Mechanics)","","2024","The Atlantic Meridional Overturning Circulation (AMOC) transports vast amounts of heat to high latitudes, and is largely responsible for Western Europe’s relatively mild climate. Climate models project the AMOC will weaken substantially over the 21st century, which impacts weather, climate, sea level and the oceanic carbon cycle. In many studies, the AMOC state is described in a condensed two-dimensional view or even by means of a single metric, which leaves many aspects of its complex 3D-structure underexposed. By revealing the sharp contrast in overturning strength between the western and eastern subpolar gyre (SPG), the recent OSNAP observations emphasized the importance of considering the AMOC in 3D.
In this study, we explore this further by analyzing the characteristics of the overturning in density space in the North Atlantic SPG on a regional scale, and over time periods ranging from seasons to decades. For this, we use model data from the high-resolution GLORYS12 reanalysis, spanning the period 1993-2020. Following the approach applied in OSNAP, the overturning is assessed from alongstream changes in boundary current transport in specific density classes. This analysis is performed for the entire SPG, for its major basins (Iceland Basin, Irminger Sea, and Labrador Sea) and for smaller segments along the boundary currents, thus providing detailed insights in variations of the overturning varies along the entire SPG boundary.
The mean overturning from GLORYS12 for 1993-2020 is 23.8 Sv, distributed as 41%, 29%, and 30% for the Iceland Basin, Irminger Sea, and Labrador Sea respectively, and peaking at increasingly higher densities in alongstream direction. Within each basin, a pronounced seasonal cycle can be identified, with the maximum overturning occurring in March and the minimum in September. Over the entire reanalysis period, the overturning strength in both the Iceland Basin and Irminger Sea exhibits a weak decreasing trend, whereas the Labrador Sea displays a weak increasing trend.
The subdivision in shorter segments reveals large spatial differences in overturning, both with regard to its overall strength and its distribution over density classes. However, these outcomes are less robust than the analyses on the scale of the major basins, as the flow is highly variable and numerical uncertainties associated with offline overturning calculations become more prominent.
Further research is needed to properly interpret these regional variations, and thereby improve our understanding of the AMOC dynamics and its sensitivity to changing oceanic and atmospheric forcing conditions. Linking them to local processes known to govern the overturning (i.e., formation of dense waters in the interior of marginal seas and their export, formation of dense waters within the boundary current system itself and the exchange of waters via overflows) seems a viable route.","","en","abstract","","","","","","","","","Civil Engineering & Geosciences","","Environmental Fluid Mechanics","","",""
"uuid:5230f0c9-a59d-4acd-8cad-d2d8ad9b4bd5","http://resolver.tudelft.nl/uuid:5230f0c9-a59d-4acd-8cad-d2d8ad9b4bd5","Accumulation of floating particles at hydraulic structures","Magherini, A. (TU Delft Civil Engineering & Geosciences); Yan Toe, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Stancanelli, L.M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Wüthrich, D. (TU Delft Hydraulic Structures and Flood Risk); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics)","","2024","Plastic pollution is a threat for all ecosystems due to its effects on people, animals, and environment (Mai et al., 2020). Rivers are estimated to transport around 0.5 millions tons of plastic per year (Strokal et al., 2023). When plastic enters a river system, it is transported downstream towards the sea but it is also likely to accumulate at specific cross sections and locations, including hydraulic structures (Al-Zawaidah et al., 2021), eventually increasing the risk of floods.
Gates, locks, weirs, and bridges are commonly present in rivers and canals and have several functions, including water level reg-ulation, flood safety, and inland water shipping. These can also be found in water treatment plants, hydropower stations as well as debris/plastic collection systems (Honingh et al., 2020). Riverine plastic accumulation is also known to cause geomorphic changes (Al-Zawaidah et al., 2021).
In-depth knowledge on how plastic particles accumulate upstream of hydraulic structures is therefore crucial to understand the processes that affect plastic transport, its influence on the safety and functionality of hydraulic structures and their effects on the hydro- and morphody-namic conditions of the flow (Yan Toe et al., 2022).
In this research experiments were performed using simplified plastic particles to analyse the processes that lead to the instability of accumulated particles upstream of a simple gate.","plastic accumulation; hydraulic structures; carpet instability; erosion","en","abstract","","","","","","","","","Civil Engineering & Geosciences","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:8a7f2545-be14-454e-8cd9-7fe344d9383f","http://resolver.tudelft.nl/uuid:8a7f2545-be14-454e-8cd9-7fe344d9383f","Imaging the magma plumbing system of Ciomadul volcano and the Perşani Volcanic Field and constraining postcollisional magma dynamics","Comeau, M.J. (TU Delft Applied Geophysics and Petrophysics); Hill, Graham J. (Czech Academy of Sciences); Kovacikova, Svetlana (Czech Academy of Sciences); Kamm, Jochen (Geological Survey of Finland); Lukács, Réka (HUN-REN Research Centre for Astronomy and Earth Sciences); Seghedi, Ioan (Academia Română); Grayver, Alexander (Universität zu Köln); Bondár, István (HUN-REN Research Centre for Astronomy and Earth Sciences); Szabolcs, Harangi (Eötvös Loránd University)","","2024","There are indications that some long-dormant or seemingly inactive volcanoes may have potentially active magma storage systems. One such system is Ciomadul volcano, which is located at the south-eastern terminus of the Carpathian volcanic chain (Romania). With the last eruption occurring at ~30 ka, this is the youngest volcano in eastern-central Europe. Understanding the nature and structure of the magma plumbing system is crucial to elucidating the evolution of the volcano and to assessing its hazard potential. This includes the depth, size, and geometry of the magma storage region, the amount and composition of the melt present, and the link between mantle and crustal processes.
Ciomadul is situated in a geodynamically active region about 50 km from the Vrancea zone, where deep earthquakes are frequent. These earthquakes may represent the descent of a dense lithospheric slab beneath a continental collision zone and this may imply an asthenospheric upwelling due to return flow of mantle material. To the north-west of Ciomadul lies a chain of older volcanic complexes, the Călimani–Gurghiu-Harghita volcanic complex; about 40 km west of Ciomadul towards the Transylvanian Basin, a monogenetic basaltic volcanic region was developed at 1.2–0.5 Ma (Perşani volcanic field). Seismic tomography has revealed low-velocity columns through the lithosphere beneath both Ciomadul and Perşani. However, high-resolution images of the complex geometry of the system are lacking.
We report here on a 3-D electrical resistivity model of the region that was generated from 41 magnetotelluric measurements acquired in 2022 that form a 75 km by 75 km array. The data typically had reliable periods from 128 Hz to 4,100+ s. Choosing appropriate locations for measurement was critical, away from sources of cultural electromagnetic noise that can contaminate the signals, as was careful data processing, including applying data pre-selection schemes and manual time windows in addition to standard approaches using robust statistics.
Phase tensor analysis suggests that the data are 3-D at all scales. The 3-D electrical resistivity model reveals conductive anomalies (<10 ohm-m) in the subvolcanic crust. These are interpreted as melt-bearing magma reservoirs distributed in the mid-lower crust (depths of ~10–25 km) and a quasi-vertical conduit extending to the near surface. The crustal reservoir is oriented north-south, has its western margin beneath the surface vent of Ciomadul, and extends ~20 km eastward. These results are consistent with the quantitative petrological models placing the upper melt-bearing silicic crystal mush reservoir at a depth of 5–20 km beneath Ciomadul, and a magma-generation area in the asthenosphere (85–105 km depth). In contrast, no strong conductive anomaly is observed in the crust below Perşani, which fits the magma evolution model, i.e. small batches of mantle-derived magmas ascend rapidly through the crustal column. Our results suggest that Ciomadul, a seemingly inactive volcano, is still underlain by a melt-bearing magma body and therefore can be regarded as having potential for reactivation and further volcanic eruptions.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:13c158e0-a6b0-488d-9254-e81f005884ce","http://resolver.tudelft.nl/uuid:13c158e0-a6b0-488d-9254-e81f005884ce","Regional Magnetotelluric Studies across Mongolia: Report on New Measurements, New Models, and Implications for Intracontinental Deformation, Deep Mineral Systems, and Intraplate Volcanism","Rigaud, Rafael (ETH Zürich); Comeau, M.J. (TU Delft Applied Geophysics and Petrophysics); Batmagnai, Erdenechimeg (Mongolian Academy of Sciences); Kruglyakov, Mikhail (University of Otago); Kuvshinov, Alexey (ETH Zürich); Becken, Michael (University of Münster); Tserendug, Shoovdor (Mongolian Academy of Sciences); Demberel, Sodnomsambuu (Mongolian Academy of Sciences)","","2024","We are investigating the lithospheric properties and lithospheric architecture beneath Mongolia with three-dimensional models of the electrical resistivity generated from magnetotelluric measurements. In addition, thermo-mechanical numerical modelling, with geophysically-guided constraints, is being used to provide valuable insights by testing the mechanical viability of different hypotheses for the temporal evolution and dynamic processes within this region.
Mongolia is located between the relatively stable Siberian craton and the extensional regime near the Baikal rift zone to the north and to the south the North China and Tarim cratons that have a northward-directed compressional regime. Due to its location, it is an excellent region to study intracontinental deformation. Furthermore, enigmatic continental intraplate basaltic volcanism of the Cenozoic age exists across Mongolia. In addition, this region contains economically important mineral zones (copper and gold), with the origin and evolution of the mineral systems linked to the whole-lithosphere architecture, crust-mantle interactions, and mantle convection dynamics.
Magnetotelluric data has been collected across Western, Central, and Eastern Mongolia. Three field campaigns in 2016, 2017, and 2018 collected more than 328 sites on an array (50 km spacing) and along three dense profiles (3-15 km spacing) that focused on the Hangai Dome (plateau) and Gobi-Altai (Arkhangai, Bayankhongor) over an area of approximately 800 km (north-south) by 400 km (east-west). Between 2020 and 2022, the array was extended to the east with 77 sites collected across central-east Mongolia (Bulgan, Selenge, Tuv, Uvurkhangai, Dundgovi; 400 by 200 km), including 34 sites along an 810 km long north-south profile crossing the Mongol-Okhotsk suture zone. In late 2022, 79 measurements were acquired in northern Mongolia across the Hovsgol region and Darhad (200 by 200 km) with an array and several profiles, which connect to data west of Lake Baikal. In early 2023, 38 sites were collected in central-east Mongolia (Umnugovi; 200 by 200 km), completing the eastern array. Later in 2023, a major field campaign was launched that successfully collected 150 measurements in western Mongolia (Zavkhan, Uvs, Govi-Altai, Khovd) over an area of approximately 500 by 400 km. This included an array (50 km spacing) and three dense profiles (5-10 km spacing). This gives approximately 700 magnetotelluric measurements collected over a total area of approximately 1000 km (north-south) by more than 1150 km (east-west).
This is a large area that approaches the scope of several other regional and national magnetotelluric survey programs. What’s more, this dataset fills an important gap between the existing magnetotelluric data across China and the Tibetan Plateau with several profiles across the Siberian Craton, in principle completing a remarkable transect of 4000 km across a variety of tectonic domains.
In this presentation, we will report on the new measurements. They will be integrated into the previously collected dataset, and new models will be generated that incorporate all data. We will also present new models of western, central and eastern Mongolia that provide insights on the properties, structure, and evolution of the Hangai Dome, the Mongol-Okhotsk suture and the Central Asian Orogenic Belt.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:95eddc8d-202b-4355-81ed-44cde9ed6d7b","http://resolver.tudelft.nl/uuid:95eddc8d-202b-4355-81ed-44cde9ed6d7b","Deep plumbing model of the Cenozoic Manzaz / Atakor intraplate volcanic system, Central Hoggar, Northwest Africa, based on electrical resistivity models","Boukhalfa, Zakaria (Centre de Recherche en Astonomie, Astrophysique et Géophysique; Université des Sciences et Technologie Houari Boumedien); Comeau, M.J. (TU Delft Applied Geophysics and Petrophysics); Benhallou, Amel (Centre de Recherche en Astonomie, Astrophysique et Géophysique); Bouzid, Abderrezak (Centre de Recherche en Astonomie, Astrophysique et Géophysique); Bendaoud, Abderrahmane (Université des Sciences et Technologie Houari Boumedien)","","2024","Continental intraplate volcanic systems, with their location far from plate tectonic boundaries, are not well understood: the crustal and lithospheric mantle structure of these systems remain enigmatic and there is no consensus on the mechanisms that cause melt generation and ascent. The Cenozoic saw the development of numerous volcanic provinces on the African plate. This includes the Hoggar volcanic province, located in Northwest Africa, part of the Tuareg shield. It is composed of several massifs with contrasting ages and eruptive styles. The magmatic activity began at around 34 Ma and continued throughout the Neogene-Quaternary. Phonolite and trachyte domes as well as scoria cones and necks are found in the Manzaz and Atakor volcanic districts. In order to image the crustal and lithospheric mantle structure of this region, and to understand the origins and potential mechanisms of the continental intraplate volcanic activity in the Central Hoggar and specifically the Atakor/Manzaz area, we acquired magnetotelluric (MT) measurements from 40 locations and generated a 3-D electrical resistivity model. The model covers an area of about 100 km by 200 km. Images of the subsurface architecture, in terms of electrical resistivity, from the near-surface to the lithospheric mantle, allow us image the deep plumbing system of the volcanic system. Low resistivity features (i.e., conductors) in the crust that are narrow, linear structures trending approximately north-south, are revealed along the two boundaries of the Azrou N’Fad terrane, in the Manzaz area. They likely reflect the Pan-African mega-shear zones, which were reactivated throughout the tectonic evolution of the region. The model reveals that these faults are lithospheric-scale. In addition, the low-resistivity features likely represent the signatures of past fluid flow. The location of the recent Cenozoic volcanic activity was likely influenced by the pre-existing structure. A deep feature of moderate conductivity is located in the upper lithospheric mantle directly beneath the Manzaz and Atakor Volcanic Districts. It may represent the origin of the overlying anomalies and may suggest metasomatism of the sub-continental lithospheric mantle.","intraplate; Hoggar; alkaline volcanism; magnetotelluric; electrical resistivity","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:2615f976-84e5-4f92-ae49-7cec13cae239","http://resolver.tudelft.nl/uuid:2615f976-84e5-4f92-ae49-7cec13cae239","Identifying Business Models of Open Data Intermediaries: A Review","Shaharudin, Ashraf (TU Delft Urban Data Science); van Loenen, B. (TU Delft Urban Data Science); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Open data has many potential benefits including stimulating innovation, enhancing accountability and transparency, and improving the reproducibility and dissemination of research (Janssen et al., 2012; Uhlir and Schröder, 2007; Zhu et al., 2019). However, there are various shortcomings in the current open data initiatives such as the mismatch between the supply and demand of open data, the lack of appropriate software to process data, and confusion regarding data licenses (Johnson et al., 2017; van Loenen et al., 2021). The role of open data intermediaries is considered important to address these weaknesses. Open data intermediaries facilitate the use of and access to open data (Chattapadhyay, 2014; González-Zapata and Heeks, 2015) and build connections among open data stakeholders (Mayer-Schönberger and Zappia, 2011). It follows that open data intermediaries are regarded as one of the priority areas in open data research (Davies and Perini, 2016). Nevertheless, in-depth studies on open data intermediaries are scarce. Within the limited studies, they are found to face several challenges that may undermine their potential contribution to other open data stakeholders. For example, lack of financial planning (Flores, 2020), over-reliance on volunteers (Reggi and Dawes, 2016), and difficulty in securing data experts (Andrason and van Schalkwyk, 2017). Some of these challenges are associated with the lack of development of open data intermediaries’ business models (Kitsios et al., 2021; Reggi and Dawes, 2016). Before any research-based development of their business models can be carried out, a clear view of the existing business models is needed. Given this, the objective of this extended abstract is to review existing business models of open data intermediaries from the academic literature through a systematic literature review (SLR). Section 2 provides a brief background on the concept of a business model. Section 3 describes the research method. Section 4 presents the findings. Last but not least, Section 5 discusses the findings and proposes considerations for future studies.","open data; intermediaries; infomediaries; business models; revenue; value","en","abstract","","","","","","","","","","Engineering, Systems and Services","Urban Data Science","","",""
"uuid:f90457ef-dd90-44d9-b82f-6fb63fbfbfd1","http://resolver.tudelft.nl/uuid:f90457ef-dd90-44d9-b82f-6fb63fbfbfd1","Perfect Fit: Identiteitsgebaseerde virtuele coach die ondersteunt bij stoppen met roken en meer bewegen - Ontwikkeling en geleerde lessen","Versluis, Anke (Leiden University Medical Center); Penfornis, Kristell M. (Universiteit Leiden); van Vliet, Milon (Leiden University Medical Center); Albers, N. (TU Delft Interactive Intelligence); Scheltinga, Bouke (University of Twente); van der Burg, Sven (Netherlands eScience Center); Baccinelli, Walter (Netherlands eScience Center); Meijer, Eline (Leiden University Medical Center)","","2023","","Virtual coach; eHealth intervention; Identity; Development; Leassons learned","nl","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:c2a00e65-4fda-4786-ae79-629db33128be","http://resolver.tudelft.nl/uuid:c2a00e65-4fda-4786-ae79-629db33128be","Investigating the role of ESG bonds and loans in financing housing renovation among social housing providers: a comparative approach to six European countries","Fernández Pérez, A. (TU Delft Urban Development Management); Elsinga, M.G. (TU Delft Urban Development Management); Haffner, M.E.A. (TU Delft Urban Development Management)","","2023","The energy transition across Europe’s built environment will probably be one of the main financial challenges of the coming decades. Renovating the social housing stock to attain the built fabric standards introduced in the European Directive on Energy Performance of Building(EPBD) will require the mobilisation of both public and private funding as envisioned by the European Commission in the Renovation Wave. In this landscape of increased investment needs, Environmental, Social and Governance (ESG) standards have risen to a prominent
position as the main indicators of sustainable investment. While ESG-earmarked funds have grown significantly in the last years, there is widespread concern about the real impact of ESG-funded projects and whether these are in fact bringing additional investment into key transitional activities such as the renovation of the social housing stock. This project poses two questions, first, How does ESG funding interlock with the renovation strategies of social housing providers? And second, How do institutional factors affect the uptake of ESG funding? To answer these questions, this project draws from semi-structured interviews with finance officers from housing providers across six European countries with large social housing stocks: Austria, Germany, The Netherlands, France, Sweden, and the UK. The main objective of this paper is to critically assess the contributions of ESG funding to the energy transition and contextualise it within traditional forms of private and public financing of social housing.","ESG; social housing; energy transition; green finance; sustainability","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:b7b74b8e-19fe-4d47-b919-fd2df521e03c","http://resolver.tudelft.nl/uuid:b7b74b8e-19fe-4d47-b919-fd2df521e03c","Assessment of 2D hydro-morphological processes to support river restoration at Isola Serafini in the Po River (Italy)","Bossinia, Francesco (Politecnico di Torino); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Penning, Ellis (Deltares); Camporeale, Carlo (Politecnico di Torino); Latella, Melissa (Politecnico di Torino)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-13","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:f980f23b-8083-47eb-99e2-8b4a0c571aff","http://resolver.tudelft.nl/uuid:f980f23b-8083-47eb-99e2-8b4a0c571aff","Effects of vegetation on gravel-bed river channel formation","Munir, Yasir (IHE Delft Institute for Water Education; Punjab Irrigation Department); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education); Bregolia, Francesco (IHE Delft Institute for Water Education; Radboud Universiteit Nijmegen); Paudel, Sandesh (Ministry of Agriculture, Energy and Water resources Gandaki Province); Liu, J. (TU Delft Water Resources; IHE Delft Institute for Water Education)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-13","","","Environmental Fluid Mechanics","","",""
"uuid:52e1f943-2507-4ee5-a623-6c03660f52f3","http://resolver.tudelft.nl/uuid:52e1f943-2507-4ee5-a623-6c03660f52f3","Response of the Upper Dutch Rhine Bifurcation Region to Peak flows","Chowdhury, M. Kifayath (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Verbeek, Merel C. (Rijkswaterstaat); Schropp, Max H.I. (Rijkswaterstaat); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-13","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:8319e8ba-37b0-46d6-a2e0-affe4e6a9c13","http://resolver.tudelft.nl/uuid:8319e8ba-37b0-46d6-a2e0-affe4e6a9c13","3D modelling of Saltwater Intrusion into the Haringvliet to support Evidencebased Policy Development","van Leeuwen, B. (Svašek Hydraulics); Bom, S. (Svašek Hydraulics); Kranenburg, W.M. (TU Delft Environmental Fluid Mechanics; Deltares); Coonen, M. (Hydrologic); Muurman, S. (Hydrologic)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-13","","","Environmental Fluid Mechanics","","",""
"uuid:a1c7a00a-5cec-4682-988a-8e1a9d534b73","http://resolver.tudelft.nl/uuid:a1c7a00a-5cec-4682-988a-8e1a9d534b73","To what extent is morphodynamics of Terai Arc Landscape rivers altered by human actions?","Gautam, K. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Roebroeck, M.E. (TU Delft Support Hydraulic Engineering); Bogaard, T.A. (TU Delft Water Resources); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-13","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:a126d5ad-87a6-4369-9dcb-a273468f9a6b","http://resolver.tudelft.nl/uuid:a126d5ad-87a6-4369-9dcb-a273468f9a6b","Comparing hierarchical and inductive methods to characterize social vulnerability. – A Burkina Faso case study","Savelberg, Lotte (Netherlands Red Cross); Homberg, Marc van den (Netherlands Red Cross); Zatarain Salazar, J. (TU Delft Policy Analysis); Casali, Y. (TU Delft Transport and Logistics); Comes, M. (TU Delft Transport and Logistics)","","2023","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:e8138f57-432c-4467-b797-c639119952b3","http://resolver.tudelft.nl/uuid:e8138f57-432c-4467-b797-c639119952b3","Climate change adaptation through integrated management of water reuse technologies","Sangiorgio, Matteo (Politecnico di Milano); Weber, Enrico (Politecnico di Milano); Cananzi, Davide (Politecnico di Milano); Zatarain Salazar, J. (TU Delft Policy Analysis); Micotti, Marco (Politecnico di Milano); Castelletti, Andrea (Politecnico di Milano)","","2023","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:6f2e94f5-7261-4ef3-9afa-6fd3d7e5f3ed","http://resolver.tudelft.nl/uuid:6f2e94f5-7261-4ef3-9afa-6fd3d7e5f3ed","Operations Eclipse Sequencing in Multipurpose Dam Planning","Giuliani, Matteo (Politecnico di Milano); Arnold, Wyatt (Politecnico di Milano); Zatarain Salazar, J. (TU Delft Policy Analysis); Carlino, Angelo (Politecnico di Milano); Castelletti, Andrea (Politecnico di Milano)","","2023","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:64c2836a-8972-4801-964d-a3a50ba2593c","http://resolver.tudelft.nl/uuid:64c2836a-8972-4801-964d-a3a50ba2593c","Periodic train timetable expansion: An integrated model of multi-period train service selection and rolling stock circulation with time-varying passenger demand","Li, Tianqi (Beijing Jiaotong University); Goverde, R.M.P. (TU Delft Transport and Planning)","","2023","The periodic train timetable is one of the most widely used train timetables in passenger railway systems worldwide. However, how to expand well-coordinated daily train services from a single-period timetable pattern is rarely studied. This paper develops a multi-objective mixed integer programming model to solve the periodic train timetable expansion problem, aiming to optimize passenger waiting time and rolling stock operation costs. In our model, the time-varying passenger assignment, train service selection, and rolling stock circulation planning are integrated. Moreover, the rolling stock circulation is considered with a flexible composition mode for efficiency. An ε-constraint method is introduced to explore the Pareto frontier for the multi-objective model and analyze the trade-offs between the service quality and operating cost. The model and analyzing theorem are validated via the real-world case Guangzhou-Shenzhen Intercity Railway transit system.","Periodic train timetable; Rolling stock circulation; Flexible train composition; Time-varying passenger demand; Integrated optimization","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-28","","","Transport and Planning","","",""
"uuid:b5350115-f7f6-4e2b-801b-39cd2b017c52","http://resolver.tudelft.nl/uuid:b5350115-f7f6-4e2b-801b-39cd2b017c52","The Productive Interaction Facility (PROD) – A National Research Infrastructure Facility","Slinger, J (TU Delft Policy Analysis); Ellen, Gerald Jan (Deltares); Vreugdenhil, H.S.I. (TU Delft Policy Analysis)","","2023","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:baf784bd-ed99-4a1b-91f3-1360f1a7c502","http://resolver.tudelft.nl/uuid:baf784bd-ed99-4a1b-91f3-1360f1a7c502","Conflict-free train path planning using ATO timing points","Wang, Z. (TU Delft Transport and Planning); Quaglietta, E. (TU Delft Transport and Planning); Bartholomeus, Maarten (ProRail); Cunillera, A. (TU Delft Transport and Planning); Goverde, R.M.P. (TU Delft Transport and Planning)","","2023","Automatic Train Operation (ATO) is a technology to support or automate train driving for increasing service punctuality, energy efficiency and rail infrastructure capacity. Conflict-free train path planning is crucial to the effective deployment of ATO, which allows ATO-equipped trains to operate according to schedule with different train driving strategies. As different train driving strategies lead to various passing times, current planning practice is inadequate to avoid route conflicts as it only sets target arrival or passing times at stops or major junctions. Therefore, conflict-free train path planning needs the definition of a Train Path Envelope (TPE) that contains time targets or windows defined at discrete locations called timing points to tolerate schedule deviations due to different driving styles. The number and location of the timing points, as well as the associated time targets or windows, is a decision problem. This paper proposes a framework to design a robust set of timing points and their associated time windows in a TPE to enable operational conflict-free train path planning against the driving strategies utilised. This framework relies on a Train Path Slot model which extends the definition of TPE from time windows at a discrete set of locations to an integrated blocking time stairway pattern continuously defined across all locations over a train route. The Train Path Slot model considers three relevant train driving strategies, i.e., energy-efficient driving with or without coasting as well as minimum-time driving considering slight delays. A Linear Programming model is formulated to compute the conflict-free Train Path Slots as constraints for train operation. To meet the optimised Train Path Slots, we analyse several possible sets of timing points in a TPE that are only located at stops or signal positions along the train routes. Those timing point sets are then compared in terms of total Train Path Slot overlap time, capacity, energy efficiency and driving performance indicators. Our research supports infrastructure managers in resolving the imminent problem of timing point determination and TPE computation to reach their capacity goals. At the same time, it allows sufficient driving flexibility for railway undertakings.","ATO-over-ETCS; Automatic Train Operation; Train Path Envelope; Train driving strategies; Timing Point","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-28","","","Transport and Planning","","",""
"uuid:dbcb0d58-27db-4ed9-96d1-782ba902b24f","http://resolver.tudelft.nl/uuid:dbcb0d58-27db-4ed9-96d1-782ba902b24f","Analysis of Safe and Effective Next-Generation Rail Signalling Systems using a FTA-SAN Approach","Aoun, J. (TU Delft Transport and Planning); Goverde, R.M.P. (TU Delft Transport and Planning); Nardone, Roberto (Università degli Studi di Napoli Parthenope); Quaglietta, E. (TU Delft Transport and Planning); Vittorini, Valeria (Università degli Studi di Napoli Federico II)","","2023","Moving Block (MB) and Virtual Coupling (VC) rail signalling will change current train operation paradigm by migrating vital equipment from trackside to onboard to reduce train separation and maintenance costs. Their actual deployment is however constrained by the industry’s need to identify configurations of MB and VC signalling equipment which can effectively guarantee safe train movements even under degraded operational conditions involving component faults. In this paper, we analyse the effectivity of MB and VC in safely supervising train separation under nominal and degraded conditions by using an innovative approach which combines Fault Tree Analysis (FTA) and Stochastic Activity Network (SAN). A FTA model of unsafe train movement is defined for both MB and VC capturing functional interactions and cause effect relations among the different signalling components. The FTA is then used as a basis to apportion signalling component failure rates needed to feed the SAN model. Effective MB and VC train supervision is analysed by means of SAN-based simulations in the specific scenario of an error in the Train Position Reporting (TPR) for five rail market segments featuring different traffic characteristics, namely high-speed, mainline, regional, urban and freight. Results show that the overall approach can support infrastructure managers, railway undertakings, and rail system suppliers in investigating effectiveness of MB and VC in safely supervising train movements in scenarios involving different types of degraded conditions and failure events. The proposed method can hence support the railway industry in identifying effective and safe design configurations of next-generation rail signalling systems.","Moving Block; Virtual Coupling; Safety; Performance; Stochastic Activity Network","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-28","","","Transport and Planning","","",""
"uuid:d2dab5ed-c4f7-4db9-b610-a5809985313a","http://resolver.tudelft.nl/uuid:d2dab5ed-c4f7-4db9-b610-a5809985313a","Extracting Railway Passenger Demand Patterns from Origin-Destination Data for Developing Demand-Oriented Service Plans","van der Knaap, R.J.H. (TU Delft Transport and Planning); de Bruyn, Menno (N.V. Nederlandse Spoorwegen); van Oort, N. (TU Delft Transport and Planning); Huisman, Dennis (Erasmus Universiteit Rotterdam; N.V. Nederlandse Spoorwegen); Goverde, R.M.P. (TU Delft Transport and Planning)","","2023","Train passenger demand fluctuates throughout the day and week and these fluctuations are expected to increase due to the COVID-19 pandemic. In order to let train services, such as the line plan and timetable, match this fluctuating demand, insights are needed into how the demand is changing and for which periods the demand is relatively stable. Hierarchical clustering on origin-destination (OD) data is used to determine for each workday continuous time-of-day periods in which the passenger demand is homogeneous. The periods found for each workday are subsequently used as input in a clustering algorithm to look for similarities and differences between workdays. Both normalized and regular OD matrices are tested as input for the method. In normalized OD matrices, only the structure of the demand is captured, while in the regular OD matrices both the structure and the volume of the demand are included. The methods for finding homogeneous periods in demand during the day and week are applied to a case study covering a large part of the railway network in the Netherlands. We find large differences between the periods based on regular OD matrices and those based on normalized OD matrices. The periods based on regular OD matrices seem more appropriate to use as input for designing a service plan. Comparison of the periods over the week shows that mainly the peak periods on Friday are far away from Monday to Thursday, and hence could benefit from an altered service plan.","Railway passenger demand patterns; Origin-destination data; Clustering; Homogeneous periods","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-28","","","Transport and Planning","","",""
"uuid:730befb8-761a-4729-882f-833836e02af6","http://resolver.tudelft.nl/uuid:730befb8-761a-4729-882f-833836e02af6","An Approximate Conflict Detection and Resolution Model for Moving-Block Signalling by Enhancing RECIFE-MILP","Versluis, N.D. (TU Delft Transport and Planning); Pellegrini, Paola (Université Gustave Eiffel); Quaglietta, E. (TU Delft Transport and Planning); Goverde, R.M.P. (TU Delft Transport and Planning); Rodriguez, Joaquin (Université Gustave Eiffel)","","2023","Conflict detection and resolution models are being developed to support railway traffic management in taking optimised rescheduling decisions in case of disturbances. Existing models mostly concern fixed-block signalling systems, in which minimum train separation distances are determined based on a preset number of blocks representing worst-case braking distances. In a moving-block signalling system, minimum train separation is based on absolute braking distances and hence depends on train speed differently from how fixed-block conflict detection and resolution models. In this paper, we propose a conflict detection and resolution model that approximates moving-block operations. The model enhances the state-of-the-art fixed-block rescheduling model RECIFE-MILP. The enhancements include a reconsideration of the discretisation of the infrastructure, the introduction of a speed profile alternative and a redefinition of the blocking times. We verify the model by comparing the solutions of the moving-block version with the fixed-block version for a specific scenario. The results indicate that the moving-block model can propose different rescheduling decisions than the fixed-block model with a better delay recovery.","Railway traffi c management; Confl ict detection and resolution; Rescheduling; Movingblock signalling; Mixed integer linear programming","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-28","","","Transport and Planning","","",""
"uuid:c6704def-d193-4034-8128-897567d7f00b","http://resolver.tudelft.nl/uuid:c6704def-d193-4034-8128-897567d7f00b","Statistical characterization of simulated wind ramps","Baki, B. (TU Delft Atmospheric Remote Sensing); Basu, S. (TU Delft Atmospheric Remote Sensing); Lavidas, G. (TU Delft Offshore Engineering)","","2023","Wind ramps, or rapid changes in wind speed, are a crucial aspect of atmospheric dynamics and have significant implications for various wind energy applications. For example, wind ramps tend to increase uncertainty in power output predictions. Furthermore, they also induce fatigue damage to wind turbines.
In a recent study, DeMarco and Basu (2018; Wind Energy) used long-term observational data from four geographical locations to characterize the tails of the wind ramp probability distribution functions (pdfs). They showed that the pdfs from these various sites (ranging from offshore to complex terrain) portray quasi-universal behavior. The tails of the pdfs are much heavier than the Gaussian pdf and decay faster with increasing time increments. The tail-index
statistics, computed via the so-called Hill plots, exhibited minimal height dependency up to
approximately one hundred meters above the land or sea surface level. However, wind ramp
statistics at higher altitudes at Cabauw (the Netherlands) were quite distinct.
In the present study, we investigate if state-of-the-art reanalysis datasets capture the intrinsic traits of wind ramp pdfs. Specifically, we make use of the newly released Copernicus European Regional ReAnalysis (CERRA) dataset in conjunction with the popular fifth-generation ECMWF reanalysis (ERA5) dataset. These datasets allow us to describe the characteristics of wind ramp pdfs at high altitudes (up to 500 m). Given the disparity of the spatial resolution of CERRA (~5.5 km) and ERA5 (~32 km) datasets, we are also able to demonstrate the impact of spatial resolution on simulated tail index characteristics. Lastly, the influence of natural climate patterns such as El-Nino and La-Nina on wind ramp pdfs are examined.","","en","abstract","","","","","","","","","","","Atmospheric Remote Sensing","","",""
"uuid:dadefdd0-44d8-4202-b9a8-bd75ebb8fc6c","http://resolver.tudelft.nl/uuid:dadefdd0-44d8-4202-b9a8-bd75ebb8fc6c","Assessing the appropriateness of different climate modelling approaches for the estimation of aviation NOx climate effects","Maruhashi, J. (TU Delft Aircraft Noise and Climate Effects); Mertens, Mariano (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (TU Delft Aircraft Noise and Climate Effects); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects)","","2023","Aviation’s contribution to anthropogenic global warming is estimated to be between 3 – 5% [1]. This assessment comprises two contributions: the well understood atmospheric impact of carbon dioxide (CO2) and the more uncertain non-CO2 effects. The latter pertain to persistent contrails and pollutants like nitrogen oxides (NOx), water vapor (H2O), sulfur oxides (SOx) and soot particles. NOx emissions are involved in non-linear processes that result in the short-term production of ozone (O3) and longer-term destruction of methane (CH4), stratospheric water vapor (SWV), and primary mode ozone (PMO). The aviation-attributable impacts arising from this short-term increase in O3 can vary by more than a factor of 1.5 depending on the selected modelling approach. This O3 increase is associated with the second largest warming effect across aviation’s main climate forcers [1]. We therefore quantify this figure using three modelling approaches (an Eulerian and a Lagrangian tagging scheme as well as a perturbation approach) at three potential aircraft cruise altitudes (200, 250 and 300 hPa) at which NOx pulse emissions are introduced in the Americas, Africa, Eurasia and Australasia. In general, the tagging method computes the contribution by an emission source to the concentration of a chemical species while a perturbation approach consists in calculating the total impact of an emission to the concentration of a species by means of subtracting two simulations: one with all emissions and a second without the specific source’s emissions. We compare results from Eulerian and Lagrangian simulations using the same climate-chemistry code: the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model. With the Eulerian setup, we are able to capture non-linear processes and feedback effects, but not track the transport of emitted species in detail. The Lagrangian setup [2], on the other hand, allows for the accompaniment of thousands of air parcel trajectories, but at the cost of assuming a simplified linear chemistry mechanism. We find that the Lagrangian tagging approach provides the largest estimates for O3 production and radiative forcing (RF), followed by the Eulerian tagging scheme and lastly by the perturbation method. We therefore investigate the appropriateness of each of these in quantifying aviation’s total and marginal climate effects by addressing the following research questions: 1) By how much are the estimates for the short-term NOx-induced O3 perturbation and consequent RF varying across the three modelling approaches and why? 2) How does this RF vary with emission altitude within the upper Troposphere/lower Stratosphere (UTLS)?
[1] Lee, D.S., Fahey, D.W., Skowron, A., Allen, M.R., Burkhardt, U., Chen, Q., Doherty, S.J., Freeman, S., Forster, P.M., Fuglestvedt, J., Gettelman, A., De León, R.R., Lim, L.L., Lund, M.T., Millar, R.J., Owen, B., Penner, J.E., Pitari, G., Prather, M.J., Sausen, R., and Wilcox, L.J.: The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018, Atmos. Environ., 244, 117834, https://doi.org/10.1016/j.atmosenv.2020.117834, 2021.
[2] Maruhashi, J., Grewe, V., Frömming, C., Jöckel, P., and Dedoussi, I. C.: Transport patterns of global aviation NOx and their short-term O3 radiative forcing – a machine learning approach, Atmos. Chem. Phys., 22, 14253–14282, https://doi.org/10.5194/acp-22-14253-2022, 2022.","Model comparison; NOx-O3 effects; Aviation climate impact","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:3fc5dd25-14df-4f58-b6f2-746dfb87f38a","http://resolver.tudelft.nl/uuid:3fc5dd25-14df-4f58-b6f2-746dfb87f38a","The impact of the Self-Portrait's design elements on child engagement in care, children's emotions and cognition, and their personal development","Verkijk, C.M. (Erasmus Universiteit Rotterdam); Tabeau, K.E. (Erasmus Universiteit Rotterdam); Gielen, M.A. (TU Delft Design Conceptualization and Communication); van Veelen, Marie Lise C. (Erasmus MC)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-12-01","","","Design Conceptualization and Communication","","",""
"uuid:ebbd742b-8d8b-4f4b-9c0b-c61bc1ff3d89","http://resolver.tudelft.nl/uuid:ebbd742b-8d8b-4f4b-9c0b-c61bc1ff3d89","Collaborative Berth Allocation with Row Generation Methods for the Core and Nucleolus","Lyu, X. (TU Delft Transport Engineering and Logistics); Lalla-Ruiz, Eduardo (University of Twente); Schulte, F. (TU Delft Transport Engineering and Logistics)","","2023","","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:c1921abf-0f68-4fac-9ba6-760dbda65f80","http://resolver.tudelft.nl/uuid:c1921abf-0f68-4fac-9ba6-760dbda65f80","Bayesian Evidential Learning (BEL) Applied to Mineral Resource Modelling to Reduce Uncertainties","Houben, A.L. (Student TU Delft); Soleymani Shishvan, M. (TU Delft Resource Engineering)","","2023","Mineral resource modelling (MRM) requires enough geological information to define the geological model. The success of a mining project is supported by the accuracy of this model and its interpretation. Major failures can occur as a result of an incorrect degree of uncertainty quantification in the geological/geometallurgical models. There are different techniques in the industry today to reduce uncertainty in MRM. All techniques respect the statistical and geostatistical properties of the constraining data, although they vary in the specifics and the approach and they all rely on the stationarity assumption, which is not a testable hypothesis but rather the choice to collect data from a certain area or domain. This paper aims at developing a framework for reducing associated uncertainties with MRM using Bayesian Evidential Learning (BEL). BEL enables to model posterior distributions in prior model spaces using predefined parameters. It provides an indication of how future data might appear, given the data and model. The Walker Lake dataset is used to test the framework. The objective is to reduce the uncertainty in the prediction of the hardness of the orebody. First, the model is built with data from lithology, mineralogy,
penetration rate and grade. These properties are obtained from samples that are spatially correlated. Then, Monte Carlo realizations are obtained based on the exploration data and the assumed uncertainty range. A relationship needs to be obtained between lithology, grade and mineralogy and hardness variables. PCA is applied to get a better visualization by looking at the most influential properties. The observed data are used to compare and see if the prior model needs to get falsified. It is determined that the penetration rate and the lithology are the most influential properties. After that, Canonical Correlation Analysis (CCA) is applied to find the combination of the variables that have the maximized linearity between the penetration data and the prediction data. The predictions are made and then back-transformed to their original space. Finally, the hardness predictions are not falsified by the observed data from the drillholes. These predictions are used to domain the orebody into soft, medium or hard materials.","","en","abstract","","","","","","","","","","","Resource Engineering","","",""
"uuid:f9c07892-76c4-4599-a99c-5d7ae6c7aef0","http://resolver.tudelft.nl/uuid:f9c07892-76c4-4599-a99c-5d7ae6c7aef0","Rapid Prototyping of Subsurface CO2 Sequestration with Flow Diagnostics","Petrovskyy, Dmytro (Heriot-Watt University); Geiger, S. (TU Delft Applied Geology); Jacquemyn, Carl (Imperial College London); Jackson, Matthew D (Imperial College London); Hampson, Gary J (Imperial College London); Silva, Julio D Machado (University of Calgary); Judice, Sicilia (University of Calgary); Rahman, Fazilatur (University of Calgary); Sousa, Mario Costa (University of Calgary)","","2023","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:90c21381-c6d3-4507-9426-b7731db22aa8","http://resolver.tudelft.nl/uuid:90c21381-c6d3-4507-9426-b7731db22aa8","Fast Modeling of Fault Leakage during CO2 Storage","Ramachandran, Hariharan (Heriot-Watt University); Doster, Florian (Heriot-Watt University); Geiger, S. (TU Delft Applied Geology)","","2023","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:cf820926-7f23-480d-a091-ea0aedfcb32f","http://resolver.tudelft.nl/uuid:cf820926-7f23-480d-a091-ea0aedfcb32f","(Re-) Evaluating the Role of Microbes for Fluid Mud Rheology and Settling","Gebert, J. (TU Delft Geo-engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); de Lucas Pardo, Miguel (Deltares); Amman, Baerbel (Niedersachsen Ports GmbH & Co. KG); Ohle, Nino (Hamburg Port Authority)","","2023","","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:2d05e49c-aadd-494c-aab4-630fbb95bc14","http://resolver.tudelft.nl/uuid:2d05e49c-aadd-494c-aab4-630fbb95bc14","Testing Conditioning Methods for Maintenance Dredging in Ports","Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Bampatzeliou, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Gebert, J. (TU Delft Geo-engineering); Chassagne, C. (TU Delft Environmental Fluid Mechanics); Ohle, Nino (Hamburg Port Authority); Schmekel, Uli (Hamburg Port Authority)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:3ca59e8f-ab8e-423b-99c5-d39eb8c7c790","http://resolver.tudelft.nl/uuid:3ca59e8f-ab8e-423b-99c5-d39eb8c7c790","Sustainable port maintenance strategies: trade-offs between dredging cost and port call efficiency","Sepehri, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); van Koningsveld, M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:0236bacc-5912-4cf3-bca9-bf8b45a09594","http://resolver.tudelft.nl/uuid:0236bacc-5912-4cf3-bca9-bf8b45a09594","Effects of Re-circulation on Sediment Properties: A Case Study in the Seaport Emden","Chamanmotlagh, F.C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Gebert, J. (TU Delft Geo-engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:470864eb-f911-4d3e-98c0-2c1d01f55743","http://resolver.tudelft.nl/uuid:470864eb-f911-4d3e-98c0-2c1d01f55743","Low-cost shaping of electrical stimulation waveforms for bioelectronic medicine with improved efficiency and selectivity","Rashidi, A. (TU Delft Bio-Electronics); Varkevisser, F. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics); Lopes Marta da Costa, T.M. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics)","","2023","Electrical stimulation is proven to be an effective way of neuromodulation in bioelectronic medicine (e.g. cochlear implants, deep brain stimulators, etc.), delivering localized treatment by the means of electrical pulses. To increase the stimulation efficiency and neural-type selectivity, there is an increasing interest to employ non-rectangular stimulation waveforms [1-4]. Even though delivering and storing digital data at the stimulator provides the highest flexibility for generating stimulation waveforms, state-of-the-art approaches suffer either from poor resolution or the requirement of high data bandwidth for wirelessly powered implants [2]. Using Analog waveform generators is an alternative approach at the cost of extra implementation complexity for each type of waveform [3]. To fulfill the same goals as employing arbitrary waveforms for stimulation, we propose to shape the typical rectangular waveform using a programmable first-order low-pass filter, mimicking the natural filtering characteristic of the neural membrane. Using bio-realistic modeling, we show that such a pre-filtered waveform requires less or equal energy for the activation of neurons when compared with other energy-efficient waveforms (e.g. Gaussian). Notably, this comes at the low cost of only one extra programmable parameter (i.e., the filter’s corner frequency), on top of the typical duration and amplitude parameters. The basic concept of this work is driven by the fact that the natural low-pass characteristic of the neuron’s membrane limits the energy transfer efficiency from the stimulator to the cell. Thus, it is proposed to pre-filter the high-frequency components of the stimulus [4]. The method is validated for a Hodgkin-Huxley (HH) axon-cable model using NEURON v8.0 software. The required activation energy is simulated for rectangular, Gaussian, half-sine, triangular, ramp-up, and ramp-down waveforms, all with pulse durations of 10-1000µs, and low-pass filtered with cut-off frequencies of 0.5-50kHz. Simulations show a 51.5% reduction in the required activation energy for the shortest rectangular pulse (i.e., 10-μs pulse width) after filtering at 5kHz. It is also shown that the minimum required activation energy can be decreased by 11.04%, 9.49%, 8.28%, 1.81%, 0.17%, and 0% when an appropriate pre-filter is applied to the rectangular, ramp-down, ramp-up, half-sine, triangular, and Gaussian waveforms, respectively. Finally, a perspective usage of this method to improve the selectivity of electrical stimulation is drawn.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:7dfa8e13-a889-4453-b51f-06ccd53adf9a","http://resolver.tudelft.nl/uuid:7dfa8e13-a889-4453-b51f-06ccd53adf9a","Port Sediments as Carbon Sink and Source","Gebert, J. (TU Delft Geo-engineering); Zander, F. (TU Delft Geo-engineering); Ohle, Nino (Hamburg Port Authority)","","2023","","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:f2a5be8b-c6cc-4798-9970-684416f46492","http://resolver.tudelft.nl/uuid:f2a5be8b-c6cc-4798-9970-684416f46492","Flax fibre metal laminates (FLARE): A bio-based FML alternative combining impact resistance and vibration damping?","Alcaraz, Mathilde (Student TU Delft); Alderliesten, R.C. (TU Delft Structural Integrity & Composites); Mosleh, Yasmine (TU Delft Bio-based Structures & Materials)","","2023","Fibre metal laminates (FML) were originally developed as a hybrid material, to create synergy between the impact resistance of metals and excellent fatigue and corrosion resistance of fibre reinforced polymers, and to overcome the shortcomings of monolithic materials. Yet, the scope of the FML concept is predominantly limited to GLAss REinforced laminates (GLARE) for aerospace structures [1]. However, with the rising concerns about climate change, and the issues of recycling glass fibre composites, a new generation of FMLs with a reduced carbon footprint should be envisaged. This can be achieved by using bio-based fibre reinforced composite layers, particularly flax fibre instead of glass fibre composite, rendering FMLs with lower embodied energy, in which aluminium layers can be easily recycled by incineration with energy recuperation of the flax composite. Flax fibres demonstrate promising specific mechanical properties compared to glass fibres, particularly regarding tensile stiffness and bending stiffness and strength. This means that flax fibres can outperform glass fibres in stiffness-based designs, and in applications in which the loading mode is predominantly in bending. This includes applications in the transportation and construction sectors as well as secondary structures for civil aircraft, such as automotive panels, flooring, and bridge decks. Additionally, flax fibre composites demonstrate high damping capabilities due to the unique hierarchical structure of these fibres. This makes them particularly suitable for applications where vibrational and acoustic damping is of interest which includes many of the above given examples. However, they also have disadvantages such as high moisture absorption that can restrict their use [2]. The FML concept would overcome these limitations and thus allow the introduction of these materials in primary structures.
In this study, the combination of flax fibre reinforced epoxy with thin aluminium layers is realised as a partially biobased alternative to current FMLs, aiming to obtain primarily good vibration damping properties and improved impact resistance. The impact behaviour of the flax fibre reinforced aluminium (FLARE) will be evaluated by low velocity impact and quasi-static indentation tests to identify the role of each material constituent. The results will be compared with a predictive model based on the work of F. Morinière et al. [3]. For the damping properties, to cover a wide range of frequencies and to compare methods, the vibration absorption capacities will be measured by dynamic mechanical analysis and vibration beam tests. The results will be compared to the model predictions from the metal volume fraction method. Finally, this study will give a first overview of the properties of FLARE and will verify the validity of the predictive tools developed for conventional FMLs, which help in the design phase to optimise the structure according to specific requirements","Fibre Metal Laminate; Biocomposite; impact; vibrational damping","en","abstract","","","","","","","","","","","Structural Integrity & Composites","","",""
"uuid:6b22f838-2f11-473a-ac65-ec2e8ebfd859","http://resolver.tudelft.nl/uuid:6b22f838-2f11-473a-ac65-ec2e8ebfd859","Poems In Space: “Au de Cologne/Sour Theater”","Sioli, A. (TU Delft Situated Architecture); Cellucci, V.A. (TU Delft Open Spaces)","","2023","Engaging the masterclass “Eau de Cologne/sour theater” that took place in a recent master-level studio-course of architecture, this paper examines the role of poetry in exploring the stories of a place and in building students’ capacity for storytelling. The masterclass, which lasted for ten days, is titled after a line from Tristan Tzara’s Dadaist poem “Proclamation without Pretention,”[i] chosen to draw attention to the sense of smell in space. Indeed, the students employed poetry to address an element rarely addressed in architectural education: smells and olfactory atmospheres. [...]","","en","abstract","","","","","","","","","","","Situated Architecture","","",""
"uuid:c12ab582-3004-4ec3-89eb-6358db6b2377","http://resolver.tudelft.nl/uuid:c12ab582-3004-4ec3-89eb-6358db6b2377","Net Zero Port Operations: A Literature Review and Conceptual Framework","Tang, X. (TU Delft Transport Engineering and Logistics); Schulte, F. (TU Delft Transport Engineering and Logistics)","","2023","","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:b6ab95db-1deb-4dad-aa24-38210b24cb4c","http://resolver.tudelft.nl/uuid:b6ab95db-1deb-4dad-aa24-38210b24cb4c","Enhancing the AOTF-based NO2 camera with light polarization sensitivity for aerosol retrievals","Dekemper, Emmanuel (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Vanhamel, J. (TU Delft Space Systems Egineering)","","2023","The AOTF-based NO2 camera is a remote sensing instrument primarily aimed at imaging and quantifying the NO2 field above cities or in industrial plumes. The measurement principle consists in acquiring a number of spectral images of the scene at selected wavelengths. Each pixel is therefore recording a discrete spectrum of the radiance collected in its acceptance cone, enabling the retrieval of the NO2 column density in its optical path by application of the DOAS method on the measured spectrum.
The core element of the instrument principle is the acousto-optical tunable filter (AOTF). This device works under the principle of the acousto-optical interaction, the coupling of the light electric field with the modulation of the crystal lattice by a shear acoustic wave created by a transducer. The coupling takes place at a single wavelength, and diffracts that part of the spectrum into another direction. By blocking the undiffracted light beam, and imaging the diffracted order, one can capture a monochromatic image of the scene.
We propose to expand the capabilities of the NO2 camera by exploiting another aspect of the acousto-optic interaction. The coupling between light and sound actually takes place in a birefringent crystal (TeO2), and one usually works with a single linear polarization of the incoming light (e-light, or o-light). The two polarization components are diffracted in different directions. If the current design is modified such that the two components can be imaged, then an information on the degree of linear polarization of the light can be obtained.
In the atmosphere, the scattering of light by air (Rayleigh), and particles (Mie) is controlling the state of polarization of the scattered solar light. Hence, aerosols not only introduce a smooth spectral signatures, but also a change of the state of polarization. The proposed modification of the NO2 camera design can provide some sensitivity on this, potentially enhancing the scientific return of the instrument with aerosol retrievals capabilities. The new instrumental design will be presented, and vector radiative transfer simulations will be produced to estimate the benefit of this change.","AOTF; NO2; light polarization; aerosols","en","abstract","","","","","","","","","","","Space Systems Egineering","","",""
"uuid:6be873e4-c7b0-4fc8-9c26-a54fc64bd855","http://resolver.tudelft.nl/uuid:6be873e4-c7b0-4fc8-9c26-a54fc64bd855","Indoor measurement of the lateral characteristics of a cargo bicycle tyre","Dell'Orto, G. (TU Delft Biomechatronics & Human-Machine Control; Politecnico di Milano); Ballo, F.M. (Politecnico di Milano); Mastinu, G. (Politecnico di Milano); Happee, R. (TU Delft Intelligent Vehicles); Moore, J.K. (TU Delft Biomechatronics & Human-Machine Control)","","2023","The use of bicycles as a cheap and healthy way to travel the “last mile” is spreading widely in the cities. This new way of dealing with short trips, known as “micro-mobility”, is also fostered by the new awareness of the global impact of ICE vehicles and rising fuel costs. In recent years, also cargo bikes are knowing a large use, both for families with children and for delivery purposes. They are featured by a long frame that can carry loads usually placed in between the rider and the front wheel. This requires fairly skilled riders to deal with driving dynamics, different from the common bicycle we are used to (Miller, M., 2023). They can easily reach a speed of 25 km/h (according to the regulations in most EU countries) being usually pedal-assisted. Tyre characteristics may strongly affect bicycle dynamics (Bulsink, V., 2015). This applies even more for cargo bikes as they are featured by remarkable load variation (load/unload configuration), relatively high speed and torque applied to the tyres, both during acceleration and braking phases. In this context, it is important to have a good understanding of tyre characteristics. With the aim of designing safer and more performant bicycles, numerical models are required. Furthermore, existing mechanical models of bicycles mostly ignore tyre dynamics and need to be updated with realistic tyre models (Dell’Orto, G., 2022). Measurements were performed with VeTyT, an indoor test-rig specific for bicycle tyres, designed at the Department of Mechanical engineering of Politecnico di Milano (Figure 1) (Dell’Orto, G., 2022). It is the only test-rig for bicycle tyres complying to the standard ISO 9001-2015. We can measure lateral force and self-aligning torque, as tyre parameters vary. The tyre 20”x2,15 was mounted on a standard aluminum rim and tested on flat track. The specific dimensions of the cargo bicycle wheel forced us to update the test-rig, designing a new steel fork to ensure sufficient stiffness and new steel plates to carry the wheel on flat track (Figure 2). Inflation pressure was set to 400 kPa, as recommended by the manufacturer. Tests were performed applying a vertical load of 411 N and 526 N, according to the technical limits of the test-rig. The camber was set to 0 degree, as first stage of the study. The lateral force and self-aligning torque as function of the slip angle are shown in Figure 3 and Figure 4, respectively. It is clear the difference in outcomes adjusting the vertical load. As the vertical load increases, both the lateral force and the self-aligning torque increase in magnitude as well. As expected, the tyre can generate higher forces with higher vertical load. It is worth noticing that the peak value of lateral force will be reached for very large slip angles (> |6| degrees, as maximum value tested in this study). Tyres for cargo bicycles are designed to carry large loads, therefore we expect to reach saturation conditions for higher vertical forces or, conversely, large slip angles. The cornering stiffnesses are reported in Table 1: for vertical load 526 N it is 23% higher than that found at 411 N.","","en","abstract","","","","","","","","","","","Biomechatronics & Human-Machine Control","","",""
"uuid:cb553c59-24c2-4a80-b325-e49fba8cd5f0","http://resolver.tudelft.nl/uuid:cb553c59-24c2-4a80-b325-e49fba8cd5f0","A study on leaching of crystallisation inhibitor in mortars","Kamat, Ameya (TU Delft Heritage & Architecture); Lubelli, B. (TU Delft Heritage & Architecture); Schlangen, E. (TU Delft Materials and Environment)","","2023","Crystallisation due to commonly occurring salts like sodium chloride (NaCl) is a known cause of damage in the built environment. Use of crystallisation inhibitors is a potential solution to reduce salt decay in building materials. Researchers have reported lower damage when sodium ferrocyanide (NaFeCN), a known NaCl crystallisation inhibitor, is mixed in fresh mortar. However, the high solubility of NaFeCN in water could make it susceptible to leaching and thus diminish its effect over time.","Advection; Diffusion; Crystallisation damage; leaching; sodium chloride; sodium ferrocyanide","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-12-31","","","Heritage & Architecture","","",""
"uuid:75bafa4f-7986-45dd-8fb2-74a33ee2595a","http://resolver.tudelft.nl/uuid:75bafa4f-7986-45dd-8fb2-74a33ee2595a","Effectiveness of User States, Demographics and Traits in Persuading to Quit Smoking","Albers, N. (TU Delft Interactive Intelligence); Neerincx, M.A. (TU Delft Interactive Intelligence); Brinkman, W.P. (TU Delft Interactive Intelligence)","","2023","This document is an encore abstract of the paper “Persuading to Prepare for Quitting Smoking with a Virtual Coach: Using States and User Characteristics to Predict Behavior” presented at AAMAS 2023.","eHealth; Conversational agent; Reinforcement learning","en","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:fe4e5124-9d14-4368-9ce2-bf576853693d","http://resolver.tudelft.nl/uuid:fe4e5124-9d14-4368-9ce2-bf576853693d","Salt weathering: advancements in experimental research on assessment and forecasting","Lubelli, B. (TU Delft Heritage & Architecture)","","2023","Salt weathering is one of the most recurrent damage processes affecting both the natural and the built environment. Due to the complexity of the process, numerical models are rarely applied in practice; accelerated weathering tests in laboratory are still the most common way to assess and forecast durability of (conservation and renovation) building materials.....","salt crystallization damage; accelerated test; RILEM TC 271-ASC","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-12-31","","","Heritage & Architecture","","",""
"uuid:9ccb6ba2-8472-4dee-95e4-58127d44689c","http://resolver.tudelft.nl/uuid:9ccb6ba2-8472-4dee-95e4-58127d44689c","Assessing Indoor Air Quality and ventilation to limit the spread of airborne pathogens – a review","Hobeika, N. (TU Delft Urban Data Science); Garcia Sanchez, C. (TU Delft Urban Data Science); Bluyssen, P.M. (TU Delft Environmental & Climate Design)","","2023","The corona pandemic underlined a lack of Indoor Air Quality (IAQ) and
ventilation. Consequently, to limit the spread of the virus, researchers explored several indicators that, through different approaches, assess IAQ and ventilation performance in indoor spaces. This paper gives an overview of those indicators and assessment methods used to evaluate IAQ and ventilation regimes focusing specifically on airborne pathogens. This review considers studies from before and during the COVID-19 pandemic. The indicators found fit into three categories: dose, building, and occupant-related indicators. Studies exploring assessment methods found in this review are grouped according to their themes: aerosol dispersion, ventilation, infection risk, design parameters, and human behaviour. The review showed a need for a holistic definition for IAQ indicators that includes all indicators and a holistic approach of studying IAQ including all five themes.","indoor air quality; aerosol dispersion; ventilation; numerical modelling; computational fluid dynamics; assessment","en","abstract","","","","","","","","","","","Urban Data Science","","",""
"uuid:2c1382d2-7284-4fab-a5d4-01122d1dc977","http://resolver.tudelft.nl/uuid:2c1382d2-7284-4fab-a5d4-01122d1dc977","Effects of COVID-19 measures on ventilation in secondary schools in the Netherlands","Ding, Er (TU Delft Environmental & Climate Design); Zhang, D. (TU Delft Environmental & Climate Design); Garcia Sanchez, C. (TU Delft Urban Data Science); Bluyssen, P.M. (TU Delft Environmental & Climate Design)","","2023","During the COVID-19 pandemic, the importance of ventilation for ensuring occupants’ health was widely stressed, especially for densely occupied places such as schools (Ding et al, 2022). Correspondingly, new protocols of ventilation were implemented in school buildings among many countries and regions. In the Netherlands, school classrooms were first required to keep the windows and doors open, and later after a national lockdown more stringent measures such as reducing student occupancy were introduced. Previous studies have already shown that the ventilation in a large portion of school classrooms did not meet the requirement (National Ventilation Coordination Team, 2020). However, what are the actual effects of the COVID-19 measures on ventilation in school classrooms remains unclear.
This study aims to investigate 1) the ventilation sufficiency, and 2) the ventilation-related effects of temporary pandemic control and prevention measures in school classrooms under the COVID-19 pandemic.","Classroom; ventilation; indoor air quality; children; COVID-19 pandemic","en","abstract","","","","","","","","","","","Environmental & Climate Design","","",""
"uuid:d140158a-053d-4574-96a7-85a8403a238f","http://resolver.tudelft.nl/uuid:d140158a-053d-4574-96a7-85a8403a238f","University students’ perception of the sound environment at their home study places","Hamida, A.B. (TU Delft Environmental & Climate Design); Eijkelenboom, A.M. (TU Delft Environmental & Climate Design); Bluyssen, P.M. (TU Delft Environmental & Climate Design)","","2023","People are staying indoors for most of their time (on average 90%), where they are exposed to different environmental stimuli (e.g., noise, temperature) that are related to the indoor environmental quality (IEQ) factors (Bluyssen, 2020). Students in higher education spend substantial time at their study places (at home or educational buildings) for their study-related activities (Beckers et al., 2016a). Noise is one of these environmental stimuli that could affect the students’ health and comfort. It was found that noise affected students’ health (Tristan-Hernandez et al., 2017), perception (Dzhambov et al., 2021), and performance (Shu & Ma, 2019). However, previous studies mainly focused on the students’ sound environment perception in classroom settings, while few (e.g., (Ramu et al., 2021) and (Beckers et al., 2016b)) investigated their perception in their study places.
This study aims to identify the sound sources that students are exposed to at their home study places. Furthermore, this study shows to which extent students are satisfied with the sound environment of their study places.","Indoor environmental quality (IEQ); sound environment; study place; sound perception; sound sources; students","en","abstract","","","","","","","","","","","Environmental & Climate Design","","",""
"uuid:a5982ed0-c6ad-4115-87d2-0cb8e35ab84f","http://resolver.tudelft.nl/uuid:a5982ed0-c6ad-4115-87d2-0cb8e35ab84f","The need for occupant-related and building-related indicators in our guidelines for indoor environmental quality","Bluyssen, P.M. (TU Delft Environmental & Climate Design)","","2023","Research has shown that, even though the indoor environmental conditions seem to comply with current guidelines and those conditions seem ‘comfortable’ enough, staying indoors is not good for our health. Reasons for this discrepancy might be the fact that these guidelines are based on single-dose response relationships to prevent negative effects, and that the criteria are determined for an average adult person, ignoring interactions occurring between stressors at human as well as environmental level. The fact that we are dealing with individuals in different scenarios (e.g. homes, offices, schools) and situations (e.g. sitting behind a desk, listening to the teacher, cooking, sleeping,) is ignored.","Indoor environmental quality; standards and guidelines; health and comfort; indicators","en","abstract","","","","","","","","","","","Environmental & Climate Design","","",""
"uuid:ff4d2838-48f7-46e2-b0c5-fa4e12e52c70","http://resolver.tudelft.nl/uuid:ff4d2838-48f7-46e2-b0c5-fa4e12e52c70","Lessons learnt in developing a virtual coach for smoking cessation and physical activity promotion","Penfornis, Kristell M. (Universiteit Leiden); van Vliet, Milon (Leiden University Medical Center); Meijer, Eline (Leiden University Medical Center); Versluis, Anke (Leiden University Medical Center); Albers, N. (TU Delft Interactive Intelligence); Scheltinga, Bouke (University of Twente); van der Burg, Sven (Netherlands eScience Center); Baccinelli, Walter (Netherlands eScience Center)","","2023","Background: Smoking and physical inactivity are two key preventable risk factors of cardiovascular disease. Yet, as with most health behaviors, they are difficult to change. In the interdisciplinary Perfect Fit project, scientists from different fields join forces to develop an evidence-based virtual coach that supports smokers in quitting smoking and increasing their physical activity. Intervention content, design and implementation as well as lessons learnt are presented in the hopes of guiding other research groups working on similar projects.
Methods: Numerous approaches were used and combined to support the development of the Perfect Fit virtual coach. Approaches include literature reviews, empirical studies, collaboration with end-users, content and technical development sprints, interdisciplinary collaboration and iterative proof-of-concept implementation. Findings: The Perfect Fit intervention integrates evidence-based behavioral change techniques as well as new techniques focused on identity change, big data science, sensor technology and personalized real-time coaching. Intervention content of the virtual coaching matches communication preferences and individual needs of end users. Lessons learnt include ways to optimally implement and tailor interactions from the virtual coach (e.g., ‘explain why user is asked for input’, ‘tailor timing and frequency of intervention components’). With regards to the development process, lessons learnt include strategies for effective interdisciplinary collaboration and technical development (e.g., ‘Find a good balance between wishes of end-users and legal possibilities’).
Discussion: The Perfect Fit development process was interactive, iterative and challenging at times. We hope
that our experiences and lessons learnt can inspire and benefit others.","","en","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:d4bcce27-ec6b-4452-9794-242ff0177bd4","http://resolver.tudelft.nl/uuid:d4bcce27-ec6b-4452-9794-242ff0177bd4","Multi-Objective Design Optimization of a Metamaterial-Based Interface","Azevedo Vasconcelos, A.C. (TU Delft Transport Engineering and Logistics); Aragon, A.M. (TU Delft Computational Design and Mechanics); Schott, D.L. (TU Delft Transport Engineering and Logistics); Jovanova, J. (TU Delft Transport Engineering and Logistics)","","2023","Elastic metamaterials have been mostly designed to control structural vibration for a specific frequency range. However, the stresses developed due to the wave propagation are not commonly consider in their design phase. This work proposes a multi-objective design optimization of a metamaterial-based interface to tune its dynamic characteristics, while keeping stresses below the allowed value.","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:bc7b7c65-25ff-4a9b-8413-ce9b60517ebb","http://resolver.tudelft.nl/uuid:bc7b7c65-25ff-4a9b-8413-ce9b60517ebb","Reactivation envelopes of immature and mature faults of Dinantian carbonates targeted for geothermal energy","Kane, E. (TU Delft Applied Geophysics and Petrophysics; Universiteit Utrecht); Pluymakers, Anne (TU Delft Applied Geophysics and Petrophysics); Niemeijer, André (Universiteit Utrecht)","","2023","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:5bd7e1dd-4242-4e47-8271-d93672db7db7","http://resolver.tudelft.nl/uuid:5bd7e1dd-4242-4e47-8271-d93672db7db7","Motion Control of a Pendulum via Magnetic Interaction","Atzampou, P. (TU Delft Dynamics of Structures); Meijers, P.C. (TU Delft Hydraulic Engineering); Tsouvalas, A. (TU Delft Dynamics of Structures; TU Delft Offshore Engineering); Metrikine, A. (TU Delft Offshore Engineering; TU Delft Engineering Structures)","","2023","The present study introduces a modified version of PD Control for the
case of a magnetically controlled pendulum. The response was observed in both
experimental and numerical simulations taking into consideration the non-linearity posed by the system. The modified PD controller was compared to the simple counterpart for further concrete justification of its superiority. The results attained highlight the benefits of the modified PD control in all facets of control
performance, namely the efficiency, the accuracy of the representation of the interaction, the sensitivity on alterations of the control gains as well as the prediction of the experimental response by the numerical simulation. Thus, the control method proposed can serve as a promising foundation for the further development of a non-contact position control technique for offshore wind turbine installation purposes.
Coastal lagoons are constantly evolving dynamic natural ecosystems, shaped over the centuries by natural phenomena and ongoing anthropic interventions. The war between man and nature is waged on various fronts: geo-morphological, climatic, ecological-environmental, architectural, and landscape, as well as in
urban settlements. Despite being a UNESCO World Heritage Site of extraordinary environmental value and beauty, the Wadden Sea, its territories, and its people, are facing an uncertain future, while currently wrestling with a latent climatic, economic-productive, and social crisis. Subsidence increased by gas extraction,
soil erosion, saltwater intrusion, eutrophication, and agricultural water pollution testify to a territory in the throes of long-term repossession by the sea. Unlike large coastal conurbations, these areas are marginal territories, with low levels of urbanization, and are mainly linked to agricultural, fishing, tourist development, and dying industrial activities. Starting from the past, the present, and its legacies, the presented work will present many possible futures of the Wadden Sea and its hinterland.","water and soil landscapes; Wadden Sea landscapes","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:db22cb5b-d584-4382-8e7f-28a1e9513af3","http://resolver.tudelft.nl/uuid:db22cb5b-d584-4382-8e7f-28a1e9513af3","The geology of landscapes: Times, rhythms, palimpsests of the Rhenish crater","Cipriani, L. (TU Delft Landscape Architecture)","","2023","The Hambach mine is one of Europe’s largest and deepest open-cast coal mines. Humans have transformed the landscape to the point of giving life to a new geological era. The mine is the symbol of humanity’s power over territorial, environmental, and climatic transformations at impressive levels of scale and scope. This contribution sums up five different times of the Hambach mine landscape,
with its rhythms and palimpsests: deep geological time, historical time, the rapid anthropogenic time of excavation, the present time of transition towards new forms of energy, and finally, future time with the conversion of the crater into a lake. Time is the driving force of this place in light of the geological, anthropic, and climatic changes. The work presents a reflection on the IDEA League summer workshop held in 2022 by TU Delft in collaboration with Aachen University and Politecnico di Milano.","water and soil landswcapes; geology of landscapes; coal landscapes; mine landscapes","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:850c191c-ad01-4e0d-9526-d1f4b42f78e9","http://resolver.tudelft.nl/uuid:850c191c-ad01-4e0d-9526-d1f4b42f78e9","Do you know what I know?: Understanding risk through collective introspection","Esteban, T.A.O.E. (TU Delft Urban Development Management)","","2023","Risk perception research has been used in flood risk management, environmental policies and programs, and the assessment of environmental attitudes and biases. Survey methods are frequently used in risk perception studies to assess a large population's perception of specific risks such as natural hazards. Others prefer focus group discussions and key informant interviews to target the study's specific risks. While these methods have yielded significant results in understanding a population's perception of the existence or non-existence of risks, as well as the personal effect or lack thereof on the target participants, these targeted risk perception studies have pre-determined risks outlined at their disposal that may condition the participants' thinking. In the City of Rotterdam, The Netherlands, six climate-related threats have been identified by the city that affects the current and future infrastructure and housing development in the city. This include extreme rainfall, flooding, soil subsidence, groundwater level decrease/increase, heat and drought, which affect many of the old houses built on poles because any drop in groundwater and increase in heat and drought weaken these wooden poles. In addition to these threats, the national government is under pressure to build at least 850,000 housing units by 2030 in order to meet current housing demand. Using a speculative design method that allows community participants to think of their own situations the study will explore what for them are existing and future risks, how they cope, and what they aspire to address the perceived existing and future risks. In this way, we will be able to identify interconnections or gaps in a community's risk perception in relation to government policy documents that have identified risks in the communities where participants live. In this study, I hope to find answers to the following questions: What are the current and perceived risks in communities both outside and inside the dike? What environmental and infrastructure changes are taking place in their communities? What effects do these changes have on the participants? And how do they intend to address perceived current and future risks?","climate risk; collective introspection; collective self-inquiry; social justice; climate justice","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:661361f3-f171-42b4-9cd6-f3efc71cd96e","http://resolver.tudelft.nl/uuid:661361f3-f171-42b4-9cd6-f3efc71cd96e","Mapping stakeholders in two delta cities in the Greater Rotterdam Living Lab to improve co-creative approaches to climate change adaptation","Esteban, T.A.O.E. (TU Delft Urban Development Management)","","2023","Homes and communities are becoming more vulnerable to climate change. Particularly now, when the pace of climatic change is increasing, safety and liveability concerns are of the utmost importance. The two coastal delta cities of Rotterdam and Dordrecht make up the Greater Rotterdam Living Lab (GRLL) for the RED&BLUE research project. Both cities have identified urban use cases based on their present priorities for various climate issues. These urban cases are dealing with combined effects of climate change, including extreme rainfall, flooding, changes in groundwater levels, subsidence, heat, and drought, in various stages of development. In some cases, existing housing areas are to be retrofitted for climate-proofing, while others are to be designed as new (additional) housing stock, low density uses developments and future evacuation areas. Different stakeholders are involved in the process of creating and planning these integrated strategies as well as their actual implementation. It is challenging to identify all stakeholders; however, to have real integrated strategies, the less visible stakeholders, including those who will be most affected, need to be acknowledged, identified, and involved in creating solutions. The current study presents an approach for integrated stakeholder mapping. Through interviewing stakeholders currently involved in the urban use cases of the GRLL we (a) identified and categorized relevant stakeholders, (b) map their interests and resources, and (c) identified thematic areas of interests where the stakeholders are involved. The purpose of this research is to demonstrate that there are more stakeholders to be considered and to visualize how different interests are aligned. This in contrast to specifying who the important stakeholders are and how much power they have. By identifying the stakeholders presently involved and in which areas, we would like to contribute to enhancing the co-creation process for climate adaptive strategies that is inherent in a living laboratory.","stakeholder mapping; case study; Rotterdam; Dordrecht; climate adaptation strategies; stakeholder; communities","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:ad1eed9f-d45a-4faa-9c98-de5d39fa49b1","http://resolver.tudelft.nl/uuid:ad1eed9f-d45a-4faa-9c98-de5d39fa49b1","From École des Beaux-Arts to École Sedad Hakkı Eldem: A History of Architecture Education and the Formation of Urban Design Pedagogy in Turkey","Tanis, F. (TU Delft Building Knowledge; Het Nieuwe Instituut Rotterdam)","","2023","Transnational exchanges between France and the Ottoman Empire, the German-speaking world and Turkey, respectively, were foundational in the professionalization of Ottoman-Turkish architects. In regard to changing regimes, the architecture school Sanayi-i Nefise Mektebi in Istanbul was the key node for pedagogical exchanges and the development of a pioneer architectural program. This paper focuses on three periods between 1882 and 1968 marked with pivotal moments of encounters in the history of the architecture school to have a better understanding of the formation of an urban design pedagogy in Turkey.
Established in 1882 by Osman Hamdi, the École des Beaux-Arts served as a model for the architecture school until the appointment of Ernst Egli in 1930. Egli made radical changes to the curriculum in parallel to the modern movement and linked architectural competitions to education. Furthermore, Egli’s suggestion to his assistant Sedad H. Eldem of finding the source of knowledge in vernacular architecture gave a new direction to the architectural pedagogy. From 1936 until his sudden death in 1938, Bruno Taut led the architectural program, placing specific focus on housing in architectural design studios and introducing the concepts of Zeilenbau and Existenzminimum—the theme of the CIAM II held in Frankfurt-am-Main in 1929.
Until the next institutional reform in 1968, Eldem consolidated the architectural program and pedagogy, which are still well-protected today by a staunch three-generation of lecturers. Surveying vernacular architecture has been an educational focus, and Existenzminimum has become the norm in architectural design studios. Eldem expanded architectural education to offices of architect-lecturers who worked on architectural competitions with students. Born from transnational exchanges, the École Sedad Hakkı Eldem ingrained new ways of thinking about architecture and urban design in Turkey through French notions (e.g. atelier, esquisse, béton armé, project) that made Ottoman concepts obsolete and paved a new path for the architecture profession in practice.","","en","abstract","","","","","","","","","","","Building Knowledge","","",""
"uuid:e8609949-deb4-46b7-aba0-89a6812a9ab1","http://resolver.tudelft.nl/uuid:e8609949-deb4-46b7-aba0-89a6812a9ab1","Beginnings of “Architecture and the Computer”: The first conference on digital architectural design at the Boston Architectural Center, 1964","Panigyrakis, Phoebus I. (TU Delft Urban Design)","","2023","On December 5 1964, the Boston Architectural Center organized the first conference on the use and impact of the computer on architectural design and the architectural and engineering professions. Under the title “Architecture and the Computer” the conference centered around technical subjects of computer and design graphics as well as deeper concepts of creativity and design intuition. Although the conference seems to belong to the prehistory of digital architecture the problems that it set continue to attract the interest and anxieties of 21st century architectural discourse. The address will 1) establish the historical context of the 1964 conference (organizers, participants, financing etc.); 2) will present the contributions and questions set by architects (Walter Gropius, Serge Chermayeff, Edward Durrell Stone) and AI foundational experts (Marvin Minsky); 3) and will report on the consecutive coverage of the conference and its subject by the architectural press. Archival material will be presented from: the Boston Architecture College Archives, Columbia University (Serge Chermayeff papers), and Harvard (Walter & Ide Gropius).","architecture history; computing history; conference history; boston","en","abstract","","","","","","","","","","","Urban Design","","",""
"uuid:a510a05d-c61a-48f5-824d-225e610c1d03","http://resolver.tudelft.nl/uuid:a510a05d-c61a-48f5-824d-225e610c1d03","Addressing the Audience: Jaap Bakema and City Exhibitions","van den Heuvel, D. (TU Delft Building Knowledge)","","2023","This paper examines the case of Jaap Bakema (1914-81) as a precursor to participation and co-creation processes in city planning. Besides his architectural practice and prolific teaching, Dutch architect and Team 10 figurehead Bakema was deeply engaged in creating exhibitions to communicate his ideas to layman audiences. He played a role in de-signing the Dutch pavilions for Expo 1958 in Brussels and the one in Osaka in 1970, as well as in the city reconstruction festivals for Ahoy’ and E55, both in Rotterdam. These public events provided Bakema with opportunities to develop his ideological agenda for urban planning in relation to the large-scale modernization processes of the period and a new Dutch national identity within a Cold War geopolitical context, built on the idea of an open society.","Architectural History; Modern Architecture; Urban Design; Jaap Bakema; Exhibitions","en","abstract","","","","","","","","","","","Building Knowledge","","",""
"uuid:9e1f9c28-1c7d-47e4-a5f8-0463f0534dfc","http://resolver.tudelft.nl/uuid:9e1f9c28-1c7d-47e4-a5f8-0463f0534dfc","Optimising the involvement of tenants in the decision-making process for energy efficiency renovation: revealing behavioural barriers of tenants","Stefanie Horian, S.H. (TU Delft Design & Construction Management); Qian, QK (TU Delft Design & Construction Management); Hoekstra, J.S.C.M. (TU Delft Urban Development Management); Visscher, H.J. (TU Delft Design & Construction Management)","","2023","","Energy efficiency; Renovation; Tenants; Behaviour; Transaction Cost; Engagement","en","abstract","","","","","","","","","","","Design & Construction Management","","",""
"uuid:93808d78-d4bf-4e6a-bef1-05c32b0f48b8","http://resolver.tudelft.nl/uuid:93808d78-d4bf-4e6a-bef1-05c32b0f48b8","Effectiveness of window signalling systems in open-plan workplaces: evidence from field work","Yüksel, S. (Student TU Delft); de la Barra Luegmayer, P. (TU Delft Architectural Technology); Boerstra, A.C. (TU Delft Environmental & Climate Design); Luna-Navarro, Alessandra (TU Delft Architectural Technology)","","2023","","Window; Feedback; Behaviour; Satisfaction; Indoor climate; Energy efficiency","en","abstract","","","","","","","","","","","Architectural Technology","","",""
"uuid:02d840e7-2096-4123-8988-d9a5a6ba5b23","http://resolver.tudelft.nl/uuid:02d840e7-2096-4123-8988-d9a5a6ba5b23","Boosting long-term-oriented thinking to promote home energy retrofit: A choice experiment","He, S. (TU Delft Design & Construction Management); Qian, QK (TU Delft Design & Construction Management); de Vries, G. (TU Delft Organisation & Governance)","","2023","","Energy efficiency; home energy retrofit; transaction costs; time preference; choice experiment","en","abstract","","","","","","","","","","","Design & Construction Management","","",""
"uuid:268ed527-69d9-480c-a934-2f537ec7c27d","http://resolver.tudelft.nl/uuid:268ed527-69d9-480c-a934-2f537ec7c27d","Integrated monitoring and evaluation of pilot with longitudinal training walls","Buijse, Tom (Deltares; Wageningen University & Research); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Eerden, Henk (Rijkswaterstaat); Collas, Frank (Radboud Universiteit Nijmegen; Rijkswaterstaat); Verbrugge, Laura (Aalto University; Radboud Universiteit Nijmegen); Paarlberg, Andries (HKV Consultants); Omar, Amgad (Deltares); de Jong, Jurjen (Deltares; Sweco); Chavarrías, Víctor (Deltares)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:4afacb8d-41f7-4b4f-bac6-65a21d6b950c","http://resolver.tudelft.nl/uuid:4afacb8d-41f7-4b4f-bac6-65a21d6b950c","Morphological steering by dredging and deposition in large rivers","Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Roukema, Dirk (Blue Pelican Associates); Ingil, Saki (Flood and Riverbank Erosion Risk Management Investment Program); Rafid, Rashidul Mamur (Flood and Riverbank Erosion Risk Management Investment Program)","","2023","Modifying the riverbed by dredging and deposition is a flexible way of steering the morphological evolution of a river into a desired direction, for instance to improve navigability, mitigate riverbank erosion or improve ecological connectivity. The world’s largest rivers, however, pose limits to the distances and relative amounts of sediment that can be dredged and deposited. The braided-anabranched Brahmaputra-Jamuna river in Bangladesh is 10 km wide and transports about 500 to 1000 million tonnes of sediment per year. We evaluate the effectiveness of two attempts to close channels of this river by dredging and deposition. Closure of a channel at Nolin Bazar in 2012 was annihilated by migration of a large meander bend. Closure of a channel at Sirajganj in the same year, accompanied with the dredging of a new pilot channel, triggered a natural development in the desired direction. We conclude that the success of such interventions depends on the large-scale alignment and evolution of channels upstream, confirming the adage that river engineers should work with the river rather than against it. We recommend giving due account to the large-scale situation, as well as implementing the intervention over a sufficiently long channel stretch to create a buffer for unforeseen erosion.","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:5d69557d-b356-4008-81f4-110937355081","http://resolver.tudelft.nl/uuid:5d69557d-b356-4008-81f4-110937355081","Numerical-modelling and earth-observations for dynamic management of Old Brahmaputra offtake","Omer, Amgad (Deltares); Mahmud, Asheque (Institute of Water Modelling); Yossef, Mohamed (Deltares); Kamal, Farhana Akhter (Institute of Water Modelling); Akter, J. (Center for Environmental and Geographic Information Services); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:3c22d77e-0dde-4534-bd69-807ec057d76d","http://resolver.tudelft.nl/uuid:3c22d77e-0dde-4534-bd69-807ec057d76d","Sustainable management of the navigability of large natural rivers","Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Creech, Calvin (US Army Corps of Engineers); Hiver, Jean-Michel (Vrije Universiteit Brussel); Huber, Nils (Bundesanstalt für Wasserbau)","","2023","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:a31ce01c-bd6a-4e74-a856-f86b2df1e7ae","http://resolver.tudelft.nl/uuid:a31ce01c-bd6a-4e74-a856-f86b2df1e7ae","Floating debris during the 2021 European floods: an experimental study and observations","Poppema, D.W. (TU Delft Hydraulic Structures and Flood Risk); Bennet, Loïc (Université de Liège); Burghardt, Lisa (Rheinisch-Westfälische Technische Hochschule); Wüthrich, D. (TU Delft Hydraulic Structures and Flood Risk); Klopries, Elena-Maria (Rheinisch-Westfälische Technische Hochschule); Erpicum, Sébastien (Université de Liège)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-02-22","","","Hydraulic Structures and Flood Risk","","",""
"uuid:47aa21bd-ed17-4d88-a673-17c281210533","http://resolver.tudelft.nl/uuid:47aa21bd-ed17-4d88-a673-17c281210533","Evaluation of building damage during the July 2021 flash-flood in the Ahr Valley (Germany)","Selvam, Harish (Rheinisch-Westfälische Technische Hochschule); Oetjen, Jan (Rheinisch-Westfälische Technische Hochschule); Wüthrich, D. (TU Delft Hydraulic Structures and Flood Risk); Korswagen, Paul A. (TU Delft Applied Mechanics); Schüttrumpf, Holger (Rheinisch-Westfälische Technische Hochschule)","","2023","","","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:8113395d-2dd1-4e95-9808-c6839c897307","http://resolver.tudelft.nl/uuid:8113395d-2dd1-4e95-9808-c6839c897307","A database and analysis of bridges clogged by floating debris during the 2021 floods","Poppema, D.W. (TU Delft Hydraulic Structures and Flood Risk); Bennet, Loïc (Université de Liège); Burghardt, Lisa (Rheinisch-Westfälische Technische Hochschule); Wüthrich, D. (TU Delft Hydraulic Structures and Flood Risk); Klopries, Elena-Maria (Rheinisch-Westfälische Technische Hochschule); Erpicum, Sébastien (Université de Liège)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-11-09","","","Hydraulic Structures and Flood Risk","","",""
"uuid:747fd72e-bb54-4323-b960-24381df83f39","http://resolver.tudelft.nl/uuid:747fd72e-bb54-4323-b960-24381df83f39","In-situ tidal marsh erodibility under high flow velocities","van den Berg, M. (TU Delft Coastal Engineering); Stoorvogel, Marte (NIOZ Royal Netherlands Institute for Sea Research); Schoutens, Ken (Universiteit Antwerpen); van den Hoven, Kim (Wageningen University & Research); Rikkert, S.J.H. (Deltares); Herman, P.M.J. (TU Delft Environmental Fluid Mechanics; Deltares); Aarninkhof, S.G.J. (TU Delft Civil Engineering & Geosciences)","","2023","Coastal defences such as dikes are increasingly pressured by climate change. Increasing storm surge, extreme rainfall and periods of draught requires evermore strengthening of dikes to maintain flood risk standards. Conventional dike strengthening (i.e., heightening and/or widening) will be either structurally or financially unfeasible. Therefor, engineers are exploring other, more sustainable, methods to ensure future flood safety. A promising method is incorporating tidal marshes in the coastal defence system. Tidal marshes reduce dike loads by wave attenuation, increase bio diversity and ecology and under the right circumstances are able to grow with sea level rise. Moreover, in case of dike failure, resulting in a dike breach and inundation of the hinterland, tidal marshes have been shown to reduce breach erosion rates. This reduction positively affects flood risk. However, in order to quantitatively estimate the effect, dike breach models need to also model tidal marsh erosion. In this study we tested a mature tidal marsh, in-situ, in winter conditions under high flow velocities (up to 2.5 m/s) to measure the erosion and estimate erodibility. We measured little erosion, order millimeters after a cumulative 2-2.5 hours. Small-scale experiments, such as the Jet Erosion Test, showed high resistance to erosion (85-140 Pa) and large varying erodibility (6.5-45 cm3/N·s). By estimating the shear stresses acting on the soil during the experiment we compare the data with the small-scale results. The comparison gives insight in whether the small-scale experiment results can be accurately translated to full-scale erosion. Also, the experiment showed which (erosion) mechanisms are important for tidal marshes during a dike breach.","","en","abstract","","","","","","","","","Civil Engineering & Geosciences","","Coastal Engineering","","",""
"uuid:ee6028ab-e84d-4f8b-8959-601d6439cb81","http://resolver.tudelft.nl/uuid:ee6028ab-e84d-4f8b-8959-601d6439cb81","Determining clock errors of ocean-bottom seismometers: an ambient-noise based method designed for large-scale ocean bottom deployments","Naranjo, D. (TU Delft Applied Geophysics and Petrophysics); Parisi, Laura (King Abdullah University of Science and Technology); Jónsson, Sigurjón (King Abdullah University of Science and Technology); Jousset, Philippe (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences); Werthmüller, D. (TU Delft Geoscience and Engineering); Weemstra, C. (TU Delft Applied Geophysics and Petrophysics)","","2023","The timing of the recordings of ocean-bottom seismometers (OBSs) is critical for accurate earthquake location and Earth model studies. GNSS signals, however, cannot reach OBSs deployed at the ocean bottom. This prevents their clocks from being synchronized with a known reference time. To overcome this, we developed OCloC, a Python package that uses time-lapse cross-correlations of ambient seismic noise to synchronize the recordings of large-scale OBS deployments. By simultaneously quantifying deviations from symmetry of a set of lapse cross-correlations, OCloC recovers the incurred clock errors by means of a least-squares inversion. In fact, because non-uniform noise illumination patterns also break the symmetry of (lapse) cross-correlations, we introduce a distance-based weighted least-squares inversion. This mitigates the adverse effect of the noise illumination on the recovered clock errors. Using noise recordings from the IMAGE project in Reykjanes, Iceland, we demonstrate that OCloC significantly reduces the time and effort needed to detect and correct timing errors in large-scale OBS deployments. In addition, our methodology allows one to evaluate potential timing errors at the time of OBS deployment. These might be caused by incorrect initial synchronization, or by rapidly changing temperature conditions while the OBS is sunk to the sea bottom. Our work advances the use of OBSs for earthquake studies and other applications.","Ocean Bottom Seismometers; Clock drift; Seismology; Ambient Seismic Noise; Least-Squares Inversion","en","abstract","","","","","","","","","","Geoscience and Engineering","Applied Geophysics and Petrophysics","","",""
"uuid:0ca59a86-dd47-41fd-9084-e0c1c6c7c4e2","http://resolver.tudelft.nl/uuid:0ca59a86-dd47-41fd-9084-e0c1c6c7c4e2","Inferences on the shear wave velocity structure below the Reykjanes peninsula (SW Iceland) from transdimensional ambient-noise surface wave tomography","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Rahimi Dalkhani, A. (TU Delft Applied Geophysics and Petrophysics); Ágústsdóttir, Þorbjörg (Iceland GeoSurvey); Guðnason, Egill Árni (Iceland GeoSurvey); Hersir, Gylfi Páll (Independent researcher); Zhang, Xin (University of Edinburgh)","","2023","We report on a Bayesian (i.e., probabilistic) inversion for the shear-wave velocity structure of the Reykjanes peninsula, SW Iceland. Travel times of Rayleigh waves traversing the peninsula served as input to the probabilistic algorithm. These Rayleigh waves were retrieved through the application of seismic interferometry to yearlong recordings of ambient seismic noise. The Reykjanes peninsula is well placed for this technique because it is surrounded by ocean, which implies a relatively uniform seismic noise illumination; the latter being a condition for accurate interferometric surface wave retrieval. The Bayesian algorithm uses a variable model parametrization by employing Voronoi cells in conjunction with a reversible jump Markov chain Monte Carlo sampler. The algorithm is entirely data-driven, meaning that, contrary to conventional deterministic tomographic inversions, the user does not need to define any regularization or parameterization parameters to solve the inverse problem.
The geology in the area of interest is characterized by four NE-SW trending volcanic systems, orientated oblique to the divergent plate boundary cutting across the Reykjanes Peninsula. These are from west to east; Reykjanes, Svartsengi, Fagradalsfjall and Krýsuvík, of which all except Fagradalsfjall host a known high-temperature geothermal field. We observe relatively high shear wave velocity patches close to the Earth’s surface (top two kilometers) at the location of these known high-temperature fields. These high velocity anomalies invert to relatively low shear wave velocities (in comparison to shear wave velocities in the same horizontal plane) at depths greater than 3 km. The latter low-velocity anomalies are relatively small below Reykjanes and Svartsengi. At depths of 5 to 8 km, a low-velocity anomaly extends horizontally below Reykjanes and Svartsengi, correlating relatively well with the inferred brittle-ductile transition below the high-temperature fields at 4-5 km depth. The low-velocity anomaly below Krýsuvík is much larger and coincides with a deep-seated low electrical resistivity anomaly. Horizontally, it coincides with the center of an inflation source at 4–5 km depth. For example, in 2010 this resulted in an uplift exceeding 50 mm/year, but several periods of alternating uplift and subsidence associated with increased seismicity have been observed in Krýsuvík since 2009. Our results both confirm and add details to previous models obtained in the area. Our study demonstrates the potential of Bayesian surface wave inversion as a complementary geophysical tool for geothermal exploration.
The excursion that is centre stage to BK4GR4 is about using three basic concepts (Basisbegrippen) – an instrument to (learn) reading, researching, and understanding the city, while observing the city by means of a particular question (perception), showing what idea the studied project in its urban cultural and social context embodies (representation), and its contribution to the city is, in its physical, societal, cultural and temporal sense (intervention). This urban observation research allows for reading the physical and lived city by means of an academic, systematic manner via differing perspectives: sensory perception; space, dimension, and scale; systems and networks; culture and society; the appropriate methods and techniques, and matching questions. This allows our students for getting a grip on the City as a Design. (2) My presentation will reveal how my students have conducted their plan analyses (Hornbækhus, Gulfosshus, Dronningegården), and in what ways these buildings by Fisker are good in terms of understanding how to apply modest materials and forms in relation to urban identity.","","en","abstract","","","","","","","","","","","Space & Type","","",""
"uuid:9dd0e6b0-0a17-4ea6-915c-07299c6cb1ad","http://resolver.tudelft.nl/uuid:9dd0e6b0-0a17-4ea6-915c-07299c6cb1ad","The Practice of Forensic Structural Engineering in IABSE Member Countries: preliminary review of survey 2022","Palmisano, Fabrizio (Politecnico di Torino; PPV Consulting); Rus, Laurent (Singular Structures Engineering); Terwel, K.C. (TU Delft Applied Mechanics)","","2023","","forensic structural engineering; survey; structural failure; structural collapse","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-22","","","Applied Mechanics","","",""
"uuid:5374840d-35bc-4fea-a6bd-1e5aaf6a6473","http://resolver.tudelft.nl/uuid:5374840d-35bc-4fea-a6bd-1e5aaf6a6473","Surface-waves suppression using seismic interferometry for imaging and monitoring of the Groningen subsurface","Shirmohammadi, F. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics)","","2023","High-resolution seismic reflections are essential for imaging and monitoring applications using data-driven methods such as seismic interferometry (SI) and Marchenko redatuming. For seismic land surveys using sources and receivers at the surface, the surface waves are the dominant noises that mask the reflections. We use SI to suppress surface waves from the reflection dataset. SI is a technique that allows the retrieval of new seismic responses at one receiver from a virtual source at the position of another receiver using, e.g., cross-correlation or convolution.
We processed a two-dimensional seismic reflection dataset acquired along a line in Scheemda, located in the Groningen province of the Netherlands. The sources are placed with a spacing of 2 m, and 601 receivers are placed every 1 m.
We implemented some pre-processing steps, including source signature deconvolution and filtering. Then, we applied SI by cross-correlation by turning receivers into virtual sources to estimate the dominant surface waves. Afterwards, we performed adaptive subtraction with different filter parameters for the matching filter to minimise the difference between the surface waves in the original data and the result of SI.
Comparing the retrieved results from SI with the original data in the time domain and the frequency-wavenumber domain shows that at least some parts of surface waves are suppressed from the dataset, which can help to better visualise reflections for future studies in imaging and monitoring the subsurface.","surface wave; Seismic Interferometry; Land seismic data; reflections; Groningen; DeepNL","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:6b59a8e7-c00e-44c5-a599-e348378b7ef5","http://resolver.tudelft.nl/uuid:6b59a8e7-c00e-44c5-a599-e348378b7ef5","Morphodynamic similarities between rivers in the Terai Arc Landscape","Gautam, K. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Roebroeck, M.E. (TU Delft Support Hydraulic Engineering); Bogaard, T.A. (TU Delft Water Resources); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","Rivers flowing from the highlands to the lowlands, characterize the Terai Arc Landscape (TAL) in Nepal and India, but also the neighbouring region in Bhutan. The sudden change in slope results in deposition of nutrient-rich sediment, which forms large alluvial or fluvial fans that enhance biodiversity and economic activities in the region. Our objective is to identify similarities and differences in hydro-morphodynamics between the TAL rivers, with a focus on the Karnali and Koshi systems in Nepal. It is expected that such insight in river dynamics will aid the sustainability and management of the TAL rivers. To this end, we investigate and compare discharge characteristics, historical flow paths, and morphodynamic characteristics such as channel shifting, braiding, and flow partitioning to identify and understand the fan scale dynamics of the two systems. Hereto we used optical remote sensing images and river discharge time series from Chisapani (Karnali) and Chatara (Koshi) gauging stations. In addition, we conducted a field campaign in November 2022.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:4d976376-dde7-477f-b4e5-d586a73db44c","http://resolver.tudelft.nl/uuid:4d976376-dde7-477f-b4e5-d586a73db44c","Land Reclamation Controls on an Estuarine Regime Shift from a Multichannel to Single Channel Configuration","Schrijvershof, R. A. (Wageningen University & Research; Deltares); van Maren, D.S. (TU Delft Environmental Fluid Mechanics; Deltares; IHE Delft Institute for Water Education); van der Wegen, M. (IHE Delft Institute for Water Education; Deltares); Hoitink, A.J.F. (Wageningen University & Research)","","2023","Deltaic intertidal areas disappear worldwide. This impacts delta morphology, because the extent and physiological character of the tidal floodplains control the tidal regime and, as a result, residual sediment transport patterns. Extensive reclamation of former tidal flats, effectively changing the ratio of channel volume to intertidal storage volume (Vs/Vc), drastically changes the functioning of the estuarine system. This might result in morphodynamic feedback loops that reach a tipping point towards an alternative stable regime (Van Maren et al., 2023). Our capacity to predict the consequences of future land reclamation or depoldering methods, a measure frequently suggested to cope with the effects of sea level rise, is limited, because the conceptual framework describing estuarine response to tidal flat reclamation fails to predict such regime transitions.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Environmental Fluid Mechanics","","",""
"uuid:58f5df46-ff88-4ad5-b5c4-fcbc802f33fb","http://resolver.tudelft.nl/uuid:58f5df46-ff88-4ad5-b5c4-fcbc802f33fb","Are engineered river bifurcations susceptible to tipping?","Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2023","Typically the time scale of river response to change of the controls (i.e., flow duration curve, sediment flux, and sea level) is of the order of decades to centuries. Understanding temporal change and, in particular, abrupt change in channel response is increasingly important in engineered river systems, as abrupt change may negatively affect flood risk, navigation, and freshwater supply. The analysis of abrupt change in engineered systems with a bifurcation (i.e., a single channel splitting into two branches or bifurcates) is complicated by the fact that insight and measured data on the partitioning of water and sediment over the bifurcates are typically lacking. Our objective is to provide insight on whether observed abrupt change of the Pannerden bifurcation in the upper Rhine delta (Netherlands) may be associated with tipping.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:38ef1ca1-793b-4299-abc9-715fa1ac05b3","http://resolver.tudelft.nl/uuid:38ef1ca1-793b-4299-abc9-715fa1ac05b3","Tidal Response to Land Reclamation in Single- and Multichannel Estuarine Systems","Beemster, J.G.W. (Wageningen University & Research); van Maren, D.S. (TU Delft Environmental Fluid Mechanics; Deltares; East China Normal University); Hoitink, A.J.F. (Wageningen University & Research)","","2023","Intertidal areas play a crucial role in controlling tidal hydrodynamics and morphodynamics in estuaries and tidal inlets. As a consequence, widespread land reclamation of the intertidal zone has led to alterations in tidal dynamics and the associated morphodynamics of estuaries worldwide. Comparatively little research has focussed on the impact of width changes on tidal hydrodynamics, and results that do exist are highly ambiguous (Talke and Jay, 2020). Tie channels in between parallel inlets complicate the tidal motion, as multichannel systems exhibit a hydrodynamic response that differs significantly from the response observed in single channel systems. In this study, we combine idealized process-based modelling and historical data analysis to investigate the effects of intertidal land reclamation on the tidal dynamics of single- and multichannel systems. Specifically, we focus on the Scheldt and Pasur-Shibsa estuaries, which represent a single- and multichannel system, respectively.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Environmental Fluid Mechanics","","",""
"uuid:9523b170-8669-44c7-9cf5-c4cd0ec9d566","http://resolver.tudelft.nl/uuid:9523b170-8669-44c7-9cf5-c4cd0ec9d566","Morphodynamic Equilibria in Double-Inlet Systems","Schuttelaars, H.M. (TU Delft Mathematical Physics); Deng, X. (Student TU Delft); De Mulder, T. (Universiteit Gent)","","2023","Tidal basins are connected to the outer sea by one or more tidal inlets. In this presentation, we focus on so-called double inlet systems, i.e., tidal inlet systems with two connecting channels. A typical example is the Marsdiep-Vlie system, located in the Dutch Wadden Sea. Using an idealized morphodynamic model, we aim at directly finding morphodynamic equilibria of double inlet systems and assess their stability. For unstable configurations, the linear stability mechanism will be presented.","","en","abstract","","","","","","","","2024-03-28","","","Mathematical Physics","","",""
"uuid:df47de4c-2523-40a3-8688-3c42b00b416a","http://resolver.tudelft.nl/uuid:df47de4c-2523-40a3-8688-3c42b00b416a","How Do Bifurcations in Engineered Rivers Respond to Sea level Rise?","Chowdhury, M. Kifayath (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2023","River bifurcations divide the water and sediment over two downstream branches or bifurcates. As the changing climate adjusts the boundary conditions (i.e., base level, hydrograph, and sediment flux) for bifurcations, it will affect their flow and sediment partitioning over the bifurcates. Our objective is to provide insight into the response of a bifurcation to sea level rise (SLR). To this end, we compare the response of an idealized bifurcation in an engineered river (i.e., with a fixed planform and width) to SLR to the one of a single channel, using a one-dimensional numerical model system.","River bifurcation; Sea Level Rise; Climate change","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:849b6603-e43a-41bd-af3c-1f35742a5c25","http://resolver.tudelft.nl/uuid:849b6603-e43a-41bd-af3c-1f35742a5c25","Drivers of residual sediment transport in a stratified estuarine channel","Niesten, I. (Wageningen University & Research); Hoitink, A.J.F. (Wageningen University & Research); Huismans, Y. (TU Delft Coastal Engineering; Deltares)","","2023","The bed stability of an estuary is determined by the net import or export of sediment, which in turn is controlled by multiple processes. Apart from the upstream riverine sediment supply, the net sediment flux is largely controlled by tidal hydrodynamics and the associated sediment exchange with the sea. In general, flood dominance causes landward residual sediment transport (sediment import from the sea), and ebb dominance causes seaward residual sediment export to the sea (Guo et al., 2014). In the New Waterway, The Netherlands, , residual fluxes are mainly associated with upstream and downstream advective transport in the salt wedge and in the fresh water layer, respectively. The associated processes have been well documented (De Nijs et al., 2010; Dronkers, 2017), which result in accumulation of sediment near the tip of the salt wedge (De Nijs et al., 2010). While it is known that mixing between freshwater and saltwater layers plays an important role in the residual salinity flux, little is known however about the exchange of sediment between both layers. We aim to quantify and understand the exchange of sediment across the freshwater-saltwater interface based on field data in a stratified tidal channel.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Coastal Engineering","","",""
"uuid:4972e750-4035-4836-a757-255b7b0985fe","http://resolver.tudelft.nl/uuid:4972e750-4035-4836-a757-255b7b0985fe","Biomonitoring in rivers adopting environmental DNA (eDNA)","Stancanelli, L.M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Dercksen, J.A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Wens, A. (Student TU Delft); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2023","A monitoring technique capable of assessing the status of an aquatic ecosystem is needed for reversing negative trends in river biodiversity. Recently, an innovative technique for detecting the degree of biodiversity based on environmental DNA traces (mucus, shed skins etc.) has been proposed (Carraro et al., 2020). This eDNA-based biomonitoring relies on the collection and processing of water samples containing genetic material released by organisms. In recent years, the research community has made significant efforts to advance the identification of species from biological samples, for instance by expanding genetic reference databases. However, eDNA technique implementation is hampered by a lack of knowledge about the dynamics of biological traces in rivers. Here, the aim is to investigate the transport of eDNA in water streams, while considering processes such as degradation and spreading.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:438e40d6-f5a4-4382-9d0e-711044efbc95","http://resolver.tudelft.nl/uuid:438e40d6-f5a4-4382-9d0e-711044efbc95","21st Century Channel Response of the Lower Rhine River to Climate Change","Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2023","Climate change puts pressure on river systems, as it increasingly alters the river controls. Engineered rivers with a fixed planform respond to climate change and human intervention by adjusting the channel slope and bed surface grain size distribution. This response often consists of channel bed incision, over hundreds of kilometres, and during decades to centuries, resulting in serious disruptions of inland navigation, increased flood risk, and ecological degradation. Here we investigate how the lower Rhine River (Bonn, Germany – Vuren, the Netherlands, including the Pannerden bifurcation) continues to adjust to channelization measures of the 19th century (Ylla Arbós et al., 2021), and responds to different climate scenarios of control change over the 21st century, using a schematized one-dimensional numerical model for mixed size sediment.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:4048b2f7-7d81-4c98-8a96-701efebf86b2","http://resolver.tudelft.nl/uuid:4048b2f7-7d81-4c98-8a96-701efebf86b2","Past River Channel Alignments Reconstruction by Combining a Meander Migration Model and Vegetation Succession","Rivera-Soler, L. (Pontificia Universidad Javeriana); Vargas-Luna, A. (Pontificia Universidad Javeriana); Giraldo-Osorio, J. D. (Pontificia Universidad Javeriana); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education)","","2023","Meandering rivers dynamics has intrigued scientists since the nineteen fifties (Hooke, 2013). Meander migration models are regularly used to predict planimetric changes (Crosato, 2018), but they have not considered the figure, the reconstructed historical channel is shown. This alignment was obtained from the analysis of the existent water marks and channel trajectories that can be identified in satellite imagery. reconstruction of their historical alignments. This study deals with the reconstruction of a 9 km long reach of the Bodoquero River (see Figure 1), located in the Caquetá department, Colombia, combining the potential of meander migration models and vegetation succession to validate the modeled historical alignments.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Environmental Fluid Mechanics","","",""
"uuid:e7f05c74-f554-4bc1-bea3-a76a2b3c0b72","http://resolver.tudelft.nl/uuid:e7f05c74-f554-4bc1-bea3-a76a2b3c0b72","Morphodynamics of sand nourishments (sand engines) in eroding sections of the Rhine-Meuse Delta","Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Jumelet, D. (de Vries & van de Wiel); Baars, L. (Rijkswaterstaat)","","2023","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-03-28","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:49259965-c4e4-4dcb-a325-0d60e61f4a81","http://resolver.tudelft.nl/uuid:49259965-c4e4-4dcb-a325-0d60e61f4a81","Towards a miniaturized cuff implant for highly selective US neuromodulation of peripheral nerves","Velea, A. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics)","","2022","In an attempt to reduce the side effects caused by the chemically-based drugs used to treat neurological disorders, the field of bioelectronics has been focusing on the development of smart and reliable solutions that could, ideally, interact with the tissue at a resolution of individual cells.1 Conventionally, electrically-based systems have been used.2 However, increasing the resolution at which they interact with the body leads to the development of invasive electrode arrays, which can cause long-term side effects.3 Another approach, based on acoustic waves, has recently emerged. Ultrasound (US) neuromodulation has been proven to be effective in modulating the response of peripheral nerves, in an in-vivo setup4 and has the potential to achieve higher spatial selectivity.5
In this work, we aim to fabricate an implantable cuff for US neuromodulation, which would employ an array of US transducers to deliver focused US to specific nerve areas in a non-invasive manner. To this end, the potential of different US transducer arrays for peripheral nerve applications is evaluated, assessing the acoustic performances as well as ease of assembly and integration. More specifically, two of the most important parameters that affect neural excitation are the frequency and output pressure generated by the US transducers.4 Conventional bulk PZT transducers can generate a wide range of output pressures but these are not small enough for this application. PZT-based arrays, integrated on CMOS have recently emerged, and will be part of this evaluation6. However, these have not yet been integrated on flexible substrates. On the other hand, micromachined US transducers (MUTs) have been gaining a lot of interest, particularly capacitive MUTs (CMUTs) which can operate at high frequencies, thus reducing the focal point significantly.5 CMUTs can be fabricated on flexible substrates, using biocompatible materials, rendering them a very attractive candidate for the envisioned cuff. However, CMUTs usually feature lower Q factors compared to PZTs, hence the output pressure still has to be evaluated for neuromodulation. In addition, this work will also discuss important characteristics of the materials used for encapsulation, as these should ensure the required flexibility of the cuff without negatively affecting the acoustic performance of the transducers.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:d624bfcc-5d5f-4004-a246-7bd898197712","http://resolver.tudelft.nl/uuid:d624bfcc-5d5f-4004-a246-7bd898197712","Towards an ultrasonically powered efficient multichannel neurostimulator implant","Kolovou Kouri, K. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics)","","2022","During the last few decades, electrical neural stimulators have successfully been employed as a means of treatment for a wide range of neurological disorders. By targeting the peripheral and central nervous systems, electrical neurostimulators activate/inhibit neural activity by manipulating the stimulus- induced electric field arising at the targeted area through diverse electrode configurations. Aiming at reducing the overall size of implanted stimulator systems, these are being designed to be wirelessly powered and batteryless. Technologies for wireless power transfer to implants are mainly based on inductive coupling and, more recently, ultrasonic waves.
To increase the power efficiency and thereby minimize the power consumption of the implant, we have previously proposed a stimulation technique that alters the electric field at the tissue by delivering charge in small packets in a very rapid manner (e.g. 1 Mpps). This charge is consequently accumulated by the tissue’s integrating nature.1 This approach removes the need to ensure continuous accurate control of the stimulus current amplitude, resulting in power savings. To the same end, in an ultrasonically powered system, unnecessary power-conversion blocks can be eliminated, as the incoming ultrasonic wave is harvested, converted into an electrical signal, rectified, and then directly used for stimulation.2
Inspired by the above, this work focuses on providing a discrete-component multi-channel neural stimulator, powered wirelessly through ultrasound (US), to activate and inhibit neural activity. The use of mostly commercially available discrete components will ensure reproducibility by other research labs and help provide a platform technology that can be used as an experimental tool in a variety of applications.3 The US pressure wave obtained at the receiving US transducer will be converted into electrical energy and used both for powering the system as well as to shape the charge packets of the eventual stimulus pulse. In this manner, the need for DC-DC up-conversion, typically needed for neuromodulation, will be eliminated.4 A charge-balancing technique, matching the fast pulse repetition rates (PRR) required for inhibition of neural activity (typically ≥ 5 kHz), will ensure the safety of the implant, while the injected charge will be constantly monitored and adapted for safe and efficacious activation/inhibition.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:57b861a1-33e5-4fc7-8f2d-12d4aa8d3e4b","http://resolver.tudelft.nl/uuid:57b861a1-33e5-4fc7-8f2d-12d4aa8d3e4b","Circular Architecture of Degrowth","Medici, P. (TU Delft Teachers of Practice / AE+T; TU Delft Theory, Territories & Transitions); Cavallo, R. (TU Delft Theory, Territories & Transitions)","","2022","This research focuses on the architecture of degrowth with regard to the Circular Economy (CE) in the built environment and the role of the architect. Today, to achieve a sound CE, the challenge related to the global decoupling of economic growth from environmental degradation has to be addressed. The impossibility of pursuing economic growth in a planet with limited physical resources forces us to face the necessity of limiting growth, especially in wealthy regions. Furthermore, to incentivise sustainable growth in more deprived areas is key, particularly in places providing shelters and better health conditions is mandatory.
Several high-density newly built neighbourhoods, even if positioned as sustainable and circular, often have a negative socio-economic and environmental impact on local communities and less developed world regions from where materials and energy are extracted(Nelson & Schneider, 2018) (Lehtinen, 2018). Economic growth and national GDPs are considered among the essential values in a world with limited energy and material resources, where the population and production of goods are constantly growing. The only possibility to reverse this trend is introducing a global shift in knowledge and culture (Calisto Friant et al., 2020) (Nelson & Schneider, 2018). Both the 1970s and recent years saw architects taking different roles in practice, for instance, increasing social cooperation and decreasing energy and material consumption, contributing thus to degrowth. Against this background, this research aims to elaborate an architectural perspective on the question of growth, exploring emerging practices and reflecting upon the limits and the potentials of their approaches. The outcome will provide insights into how best practices in architecture regarding CE and degrowth can generate alternative roles for architects. This research will analyze and elaborate upon relevant case studies such as De Ceuvel, Amsterdam by Space&Matter; R-Urban, Paris by Atelier Architecture Autog r e (Calisto Friant et al., 2020); the Heckenbeck village, Germany (Grewer & Keck, 2019) and other examples from the 2019 Oslo Architecture Triennale entitled 'Enough: The Architecture of Degrowth (OAT, 2019).'","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-17","","","Teachers of Practice / AE+T","","",""
"uuid:15c8bbbf-8370-42a7-ab96-9244eeaa331d","http://resolver.tudelft.nl/uuid:15c8bbbf-8370-42a7-ab96-9244eeaa331d","The analysis of the climate mitigation potential in terms of O3-Radiative Forcing from aviation NOx using O3 algorithmic climate change functions","Rao, P.V. (TU Delft Aircraft Noise and Climate Effects); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (TU Delft Aircraft Noise and Climate Effects); Yamashita, Hiroshi (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Jöckel, Patrick (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Mertens, Mariano (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Frömming, Christine (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2022","Aviation contributes to 3.5% of anthropogenic climate change in terms of Effective Radiative Forcing (ERF) and 5% in terms of temperature change. Aviation climate impact is expected to increase rapidly due to the growth of air transport sector in most regions of the world and the effects of the COVID-19 pandemic are expected to only have a temporary effect on this growth. While efforts have been made to curb CO2 emissions, non-CO2 effects that are at least equally significant according to recent research, require more attention. The EU Horizon 2020 project ClimOp considers a comprehensive approach to tackling the climate impact of aviation using novel operational measures. One such measure is climate-optimised flight planning, where small deviations can be made in aircraft trajectories to minimise their overall climate impact. Algorithmic Climate Change Functions (aCCFs) are used to estimate the climate impact of local non-CO2 effects such as nitrogen oxide (NOx) emissions (via ozone (O3) formation and methane (CH4) depletion), aviation water vapour (H2O) and contrails using weather variables directly as inputs. By using these functions in an air traffic optimisation module, climate sensitive regions are detected and avoided leading to climate-optimised trajectories. Here, we focus specifically on evaluating the effectiveness of reducing the aviation NOx induced climate impact via O3 formation, using only O3 aCCFs for the optimisation strategy. This is achieved using the chemistry climate model EMAC (ECHAM5/MESSy) and various submodels. A summer and winter day, characterised by high spatial variability of O3 aCCFs are selected, following which, air traffic over the European airspace is optimised with respect to climate as well as operating cost. The air traffic is laterally and vertically optimised separately to enable an evaluation of the horizontal and vertical pattern of O3 aCCFs. It is shown that despite the significant impact of the synoptic situation on the transport of emitted NOx, the climate-optimised flights lead to lower O3 Radiative Forcing (RF) compared to the cost-optimised flights. The study finds that while O3 aCCFs can reduce the climate impact, there are certain discrepancies in the prediction of O3 impact from aviation NOx emissions, as seen for the selected summer day. Although the aCCFs concept is a rough simplification in predicting future pathways of emissions and subsequent climate impact, we could show that it enables a reasonable first estimate. Further research is required to better describe the aCCFs allowing an improved estimate in O3-RF reduction for optimisation approaches.","","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:2a0ca1e3-f03d-49c3-9b0b-52c15010d138","http://resolver.tudelft.nl/uuid:2a0ca1e3-f03d-49c3-9b0b-52c15010d138","Integrated assessment of renewable urban heating systems considering water use, committed emissions and energy justice","Kaandorp, C. (TU Delft Water Resources); van de Giesen, N.C. (TU Delft Water Resources); Abraham, E. (TU Delft Water Resources)","","2022","Transitioning towards renewable heating is important to minimise the use of fossil fuels and abate carbon emissions, because heating accounts for 50% of the final energy consumption and 40% of carbon dioxide emissions globally. In the city of Amsterdam, the Netherlands, the aim is to transition towards renewable heating by 2040 and achieve carbon-neutral heating by 2050 through a neighbourhood-based approach. Such an approach entails that per neighbourhood a renewable heat solution is chosen based on criteria such as carbon emissions, reliability, affordability and feasibility. The impacts of urban heating systems however goes beyond a neighbourhood, and take place on multiple spatial and temporal scales. In this presentation we discuss how a transition towards renewable heating systems can influence the water-energy-land nexus on multiple scales in three ways.
First, heating systems use water locally, but also indirectly through the water footprint embedded in energy carriers. We therefore present an analysis of the direct and indirect water use of heating pathways towards 2050. Second, heating systems which currently have the lowest carbon emissions, may not be the heat option with the lowest carbon emissions in the future. Current decisions for heat options can therefore create non-optimal solutions for minimising carbon emissions in the future. An optimization model to find a mix of heating systems to reduce committed emissions on a neighbourhood scale within a given time period for different scenarios for the insulation of buildings and the decarbonisation of electricity generation is therefore presented. At last, new norms and forms of organising neighbourhood-based heating systems may emerge, potentially creating or exacerbating social inequalities within and beyond the spatial boundaries of a neighbourhood. We therefore present the preliminary results of an analysis on energy justice based on in-depth interviews with urban professionals, dwellers and decision makers in Amsterdam.
By presenting these three studies we aim to address the challenge of multi-scale impacts of transitioning towards renewable urban energy systems and show how energy-water-land nexus research can contribute to decision making for urban infrastructures.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:cae79484-095f-477e-94b3-27a4698775e8","http://resolver.tudelft.nl/uuid:cae79484-095f-477e-94b3-27a4698775e8","An experimental and numerical study of bentonite swelling under constant-volume conditions","Dieudonné, A.A.M. (TU Delft Geo-engineering); Gatabin, Claude (Université Paris-Saclay, Paris); Dridi, Wissem (Université Paris-Saclay, Paris); Talandier, Jean (Agence nationale pour la gestion des déchets radioactifs (ANDRA)); Collin, Frédéric (Université de Liège); Charlier, Robert (Université de Liège)","","2022","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Geo-engineering","","",""
"uuid:fb341c99-20da-4781-a9d2-79adb01238bf","http://resolver.tudelft.nl/uuid:fb341c99-20da-4781-a9d2-79adb01238bf","A Lagrangian study of globally emitted aviation NOx and associated short-term O3 radiative forcing effects","Maruhashi, J. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (TU Delft Aircraft Noise and Climate Effects); Frömming, Christine (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Jöckel, Patrick (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects)","","2022","The resilient growth of air travel demands a comprehensive understanding of the climate effects from aviation emissions. The current level of knowledge of the environmental repercussions of CO2 emissions is considerably higher than that of non-CO2 emissions, which includes nitrogen oxides (NOx), sulfur oxides (SOx), other aerosols like black carbon (BC), water vapor and contrails. Aircraft NOx emissions not only possess a high degree of uncertainty because of the non-linearity of the NOx – O3 chemistry, but are also responsible for producing the second strongest net warming effect out of all non-CO2 climate forcers from aviation, right after contrails [1]. This study employs global-scale simulations to characterize the transport patterns of nitrogen oxides and assess their climate effects across several regions (North America, South America, Africa, Eurasia and Australasia) from January to March and July to September in 2014. Radiative forcing effects from the short-term increase in O3, which are triggered by NOx emissions, are estimated. These emissions, which are introduced at a typical cruising altitude, are modelled as Lagrangian air parcels that are transported within the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model [2]. In order to summarize the dynamical and radiative forcing characteristics of more than 10,000 simulated trajectories, a clustering approach with an adapted distance metric is applied. The method itself is an unsupervised machine learning algorithm, called QuickBundles [3], that is most commonly used in the field of neuroscience. A strong seasonal dependence is found for the contribution of NOx emissions to O3. In terms of residence times, NOx emitted in Northern regions resides mainly in the upper mid-latitudes while those initiated in the South remain mostly in the Tropics. Due to pronounced zonal jets, the location of emission does not necessarily correspond to the region that will be most affected, i.e., an emission starting in N. America in July will induce the greatest warming in Europe.
[1] Lee, D.S., Fahey, D.W., Skowron, A., Allen, M.R., Burkhardt, U., Chen, Q., Doherty, S.J., Freeman, S., Forster, P.M., Fuglestvedt, J., Gettelman, A., De León, R.R., Lim, L.L., Lund, M.T., Millar, R.J., Owen, B., Penner, J.E., Pitari, G., Prather, M.J., Sausen, R., Wilcox, L.J.: The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018, Atmospheric Environment, Volume 244, 2021, 117834, ISSN 1352-2310, https://doi.org/10.1016/j.atmosenv.2020.117834.
[2] Jöckel, P., Kerkweg, A., Pozzer, A., Sander, R., Tost, H., Riede, H., Baumgaertner, A., Gromov, S., Kern, B., Development cycle 2 of the Modular Earth Submodel System (MESSy2), Geoscientific Model Development, 3, 717-752, doi: 10.5194/gmd-3-717-2010, 2010.
[3] Garyfallidis, E., Brett, M., Correia, M. M., Williams, G. B., Nimmo-Smith, I. QuickBundles, a Method for Tractography Simplification. Frontiers in neuroscience, 6, 175. https://doi.org/10.3389/fnins.2012.00175, 2012.","Ozone; Nitrogen oxides; Radiative forcing; Lagrangian; Atmospheric chemistry; Aviation; Climate","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:5ec69f67-bf31-4fdc-ba2e-2855665779cc","http://resolver.tudelft.nl/uuid:5ec69f67-bf31-4fdc-ba2e-2855665779cc","“Bump! - sorry. What’s this? Oh hello!” Do things have stories of their own?","Campos Uribe, A. (TU Delft Space & Type)","","2022","The imaginary encounter above recalls how Aldo van Eyck (1919-1999) explained his de- sign for the Sonsbeek Pavilion (1965-66), which possessed something of the closeness, density and intricacy of things urban, in the sense that people and things met, converged and clashed there. The idea was synthesised in a famous drawing, where Van Eyck care- fully placed each and every art piece creating an animistic network of things or “Thous”, in Martin Buber’s words, that activated space and enabled a situationist dérive. Et Voilà, labyrinthian clarity, the sculpturesbecame alive.
However, little is known that the Van Eycks themselves inhabited not a dissimilar place, a concealed house in the Netherlands that is full of African masks, Aboriginal spears, Pre-Columbian bowls, Avant-Garde paintings and sculptures, drawings, models, and modern poetry books (Fig.). Rumour is that Van Eyck had conversations with these things (“good morning, sculpture”), that he arranged and re-arranged them obsessively, in search of a perfect balance, what he called harmony in motion. He hummed in-between them, a mental exercise to assist his design process, as if he was playing, making up imaginary encounters and discussions.
But, what if he was right? What if things have lives of their own? After years of look-
ing at the things, trying to understand why Van Eyck brought them here, I decided
to perform a Latourian turn. Objects are as important in creating social situations as humans, and, with narrative techniques, it is possible to tell the story from the objects’ perspectives (Fictocriticism, Frichot-Stead); “Where was I crafted? By who? How did I came here? Who is this man (Van Eyck) who looks at me so deeply? What am I doing for him?” These questions enable a different discourse where objects are not a question of aesthetic inspiration only. They are now actors in a long process of extraction, alterity, exotization, renovation of the unfinished project of modernity... Art dealing enters
the scene, together with the travel industry, the discussions around universalism and cultural relativity. As it tuned out, the thing’s tales were a key to unpack the ways do- mesticity, global travels and art collecting can be seen as intersecting fields (intersecting “at home”), and how they sustained Van Eyck’s thinking (and his contemporaries’), from which modern architecture was profoundly re-conceptualised.","","en","abstract","","","","","","","","","","","Space & Type","","",""
"uuid:8e8845a3-07cf-4684-9924-bccc3d969126","http://resolver.tudelft.nl/uuid:8e8845a3-07cf-4684-9924-bccc3d969126","Identifying behavioural change interventions that activate individuals to drive the energy transition process","de Koning, J.I.J.C. (TU Delft Design for Sustainability); Onencan, A.M.","","2022","","","en","abstract","","","","","","","","","","","Design for Sustainability","","",""
"uuid:4995960d-6e1b-4f3c-88a3-b6ad906274d4","http://resolver.tudelft.nl/uuid:4995960d-6e1b-4f3c-88a3-b6ad906274d4","Remote Reconnaissance Mission to the 14th August 2021 Haiti Earthquake; remote sensing and building damage assessments","Whitworth, Michael R. Z. (AECOM, London); Giardina, Giorgia (TU Delft Geo-engineering); Penney, Camilla (University of Cambridge); Di Sarno, Luigi (University of Liverpool); Adams, Keith (Brunel University London); Kijewski-Correa, Tracy (University of Notre Dame); Macabuag, Josh (World Bank/ Independent, London); Foroughnia, Fatemeh (TU Delft Geo-engineering); Macchiarulo, V. (TU Delft Geo-engineering)","","2022","Post-earthquake reconnaissance missions are critical to understand the event characteristics, identify building and infrastructure vulnerabilities, and improve future construction practice. However, in-field missions can present logistic and safety challenges that do not make them viable in every post-disaster scenario. Remote sensing technique can be used to rapidly collect a large amount information that can be used to enrich the post-event learning process. While the possibility to deploy teams in the field remain a valuable asset for an integrated understanding of technical and socio-economic factors, a mix of remote and in-field reconnaissance activities can be a way forward in post-disaster management.
This work presents the results of a hybrid mission mobilised by the Earthquake Engineering Field Investigation Team (EEFIT) after the 2021 Haiti earthquake. On 14 August 2021, a 7.2 magnitude earthquake struck the Tiburon Peninsula in the Caribbean nation of Haiti, approximately 150km east of the capital Port au Prince. The event was followed by numerous aftershocks up to magnitude 5.7, and tiggered over 1000 landslides. Over 2000 people lost their lives, with over 15,000 injured and over 137,000 houses damaged or destroyed. The estimated economic impact is of the order of US$1.6 billion. Due the complex political and security situation in Haiti, coupled with the global pandemic, a full in field mission was not considered feasible, so a hybrid mission was designed instead.
First, open-source information was collected and used to characterise the seismic event, analyse the strong ground motion and compare to established national and international earthquake codes and standard. Second, remote sensing techniques including Interferometric Synthetic Aperture Radar (InSAR) and Optical/Multispectral imagery were used to understand the earthquake mechanism, the ground displacement distribution and the possibility to detect landslide on a regional scale. The general applicability of remote sensing technique in the context of post disaster assessment was also evaluated. Finally, the earthquake impact on different building typologies in Haiti was investigated through the damage assessment of over 2000 buildings comprising schools, hospitals, churches and housing. This was done in collaboration with the Structural Extreme Events Reconnaissance (StEER) team, who mobilised a team of local non-experts to rapidly record building damage.
This talk summarises the mission setup and findings, and discusses the benefits of and difficulties encountered during this hybrid reconnaissance.","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:3cc96a4b-8233-4e86-bdc7-3411f3c16e4b","http://resolver.tudelft.nl/uuid:3cc96a4b-8233-4e86-bdc7-3411f3c16e4b","Two-echelon Multi-trip Vehicle Routing Problem with Synchronization for An Integrated Water- and Land-based Transportation System","Karademir, C. (TU Delft Transport Engineering and Logistics); Alves Beirigo, B. (TU Delft Transport Engineering and Logistics); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Atasoy, B. (TU Delft Transport Engineering and Logistics)","","2022","","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:bd95ae1b-bcfb-4dba-8541-b80215daa4d8","http://resolver.tudelft.nl/uuid:bd95ae1b-bcfb-4dba-8541-b80215daa4d8","To wait or not to wait? A-learning-based approach for on-demand ride-pooling water transport systems","Alves Beirigo, B. (TU Delft Transport Engineering and Logistics); Atasoy, B. (TU Delft Transport Engineering and Logistics)","","2022","","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:fa1e6cb4-6af7-4f35-bc73-c446afd8d68c","http://resolver.tudelft.nl/uuid:fa1e6cb4-6af7-4f35-bc73-c446afd8d68c","Dynamic synchromodal transport planning under uncertainty: A reinforcement learning approach","Zhang, Y. (TU Delft Transport Engineering and Logistics); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Atasoy, B. (TU Delft Transport Engineering and Logistics)","","2022","","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Transport Engineering and Logistics","","",""
"uuid:c6259c87-b009-4c23-8f43-2972a8ed7368","http://resolver.tudelft.nl/uuid:c6259c87-b009-4c23-8f43-2972a8ed7368","Performance of the AOTF-based NO2 camera for urban pollution imaging","Dekemper, Emmanuel (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Vanhamel, J. (TU Delft Space Systems Egineering); Van Roozendael, Michel (Royal Belgian Institute for Space Aeronomy (BIRA-IASB))","","2022","An instrument capable of imaging the field of NO2 in various open-air situations has been designed, manufactured, and tested. It is an improved version of the NO2 camera relying on an AOTF (acousto-optical tunable filter) which has demonstrated, amongst other things, its capability to quantify the NO2 released by power plant smokestacks. The improved version which is presented has a larger field of view, a higher frame rate, and better spectral registration performance.
The working principle of the instrument has been preserved: by driving the AOTF with the appropriate acoustic frequency, a spectral image of the scene captured by the camera is recorded at a particular wavelength. The recording of a number of spectral images allows to form an hypercube: two spatial dimensions, and a spectral one.
While the earlier instrument was relying on a handful of wavelengths to quantify the slant column density of NO2 observed in each pixel line of sight, the new instrument can now record ""continuous"" portions of the visible-light spectrum, typically between 440, and 460nm, where the NO2 exhibits some of its largest absorption lines.
When the target is stable, like the air observed above a city skyline, the NO2 camera has enough time to build a large hypercube, and the spectrum measured in each pixel can be processed by the DOAS (differential optical absorption spectroscopy) method. This approach is better suited when NO2 is expected across the entire scene, not just in the plume of a smokestack for instance.
The new instrument will be presented, and results of measurements performed in an urban context will be shown. The performance of the NO2 camera will be discussed based on the results of an intercomparison with the MAX-DOAS of Uccle, Brussels, and other air quality stations.","NO2; AOTF; imaging photoplethysmography","en","abstract","","","","","","","","","","","Space Systems Egineering","","",""
"uuid:7b861410-1a0c-4837-89f7-59c80e99d58a","http://resolver.tudelft.nl/uuid:7b861410-1a0c-4837-89f7-59c80e99d58a","Towards an investigational platform for a multimodal neuromodulation approach","Panskus, R. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics)","","2022","Over the past decades, neuromodulation has been proven to be an effective treatment for several neurological disorders. Moreover, it continues to be a rapidly evolving field with a wide-ranging potential for biomedical applications. However, efficient and patient-specific targeted neuromodulation remains one of the biggest challenges for implantable devices.
Current studies explore the possibility of using multimodal neuromodulation techniques by combining electrical, thermal, optical, ultrasonic, and/or pharmacological methods to increase the specificity of therapies.1 Moreover, it is hypothesized that the safety profiles and spatiotemporal resolution could potentially increase by combining electrical and ultrasonic methods into a hybrid neuromodulation technique.2 Low-intensity focused ultrasound has the potential to alter the neural response in a wide range of neuronal targets, with an improved spatial resolution.3,4 However, the most effective, reliable, and safe acoustic parameters are currently unknown, especially for the peripheral nervous system, due to the little understanding of the mechanisms that govern this method.5
In this study, we propose an investigational platform that will allow us to explore a variety of ultrasound parameters for a multimodal neuromodulation approach. The platform integrates a custom- adapted system for stimulation and neural recording, commercially available components for the ultrasound stimulation system, and an experimental control unit with a PC interface. The proposed setup facilitates the evaluation of the tested parameters during experiments on explanted nerve models. Here we will describe potential implementations of such a system and discuss challenges that can be faced during experiments on explanted nerves.
This work can be useful to increase our understanding of ultrasound neuromodulation on peripheral nerves and its benefits when integrated into a hybrid platform dedicated to multimodal neuromodulation.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:2d159f93-0e61-4acc-a3c9-3178a7588360","http://resolver.tudelft.nl/uuid:2d159f93-0e61-4acc-a3c9-3178a7588360","3D geomechanical modelling of induced seismicity: Simulated finite-source to moment tensor inversion","Ruan, J. (TU Delft Applied Geophysics and Petrophysics); Masfara, La ODE Marzujriban (TU Delft Applied Geophysics and Petrophysics); Ghose, R. (TU Delft Applied Geophysics and Petrophysics); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics)","","2022","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:d198b488-7b35-42d4-9bef-00f51b34e343","http://resolver.tudelft.nl/uuid:d198b488-7b35-42d4-9bef-00f51b34e343","High-order homogenization for simulating local effects of small-scale structures on seismic waves","Cupillard, Paul (Lorraine University); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics; Shell Global Solutions International B.V.)","","2022","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Applied Geophysics and Petrophysics","","",""
"uuid:1e7fc9b1-6818-4195-b72c-74a408f222bc","http://resolver.tudelft.nl/uuid:1e7fc9b1-6818-4195-b72c-74a408f222bc","Degradation at transition zones in railway tracks: 1-D and 2-D model comparison","Faragau, Andrei B. (TU Delft Dynamics of Structures); van Dalen, K.N. (TU Delft Dynamics of Structures); Metrikine, A. (TU Delft Offshore Engineering; TU Delft Engineering Structures)","","2022","Transition zones in railway tracks are areas with considerable variation of track properties (i.e., foundation stiffness) encountered near structures such as bridges. Due to strong amplification of the railway track’s response, transition zones are prone to rapid degradation. To study this degradation, researchers and engineers have developed models ranging from simple 1-D models (e.g., beam on Winkler foundation) to complex 3-D models with accurate geometry and material behaviour. This study compares a 1-D model to a 2-D one with the aim of assessing if the degradation patterns predicted by the more simplistic model are accurate. We choose a very simple geometry for the 2-D model such that the comparison is restricted to (mainly) the influence of the soil layer (present in the 2-D model) on the predicted degradation at transition zones; incorporating the soil layer makes the response of the supporting structure frequency and wavenumber dependent as well as non-local, characteristics which are not usually incorporated in 1-D models. Preliminary results show that the degradation predicted by the 1-D model is significantly larger than the one in the 2-D model.","","en","abstract","","","","","","","","","","Engineering Structures","Dynamics of Structures","","",""
"uuid:595863ab-e156-4e03-8f28-5b1863c9bed3","http://resolver.tudelft.nl/uuid:595863ab-e156-4e03-8f28-5b1863c9bed3","Harmonic Balance Method for the stationary response of continuous systems with nonlinear hysteretic damping under harmonic excitation","Zhang, J.; Faragau, Andrei B. (TU Delft Dynamics of Structures); van der Esch, I.A.; Metrikine, A. (TU Delft Offshore Engineering; TU Delft Engineering Structures); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2022","Under harmonic excitation, soil exhibits softening behaviour that can be captured through the so-called hyperbolic soil model. The response of systems with such a material model can elegantly be obtained using the classical Harmonic Balance Method (HBM). Soil also exhibits nonlinear hysteretic damping under harmonic excitation, feature which is not incorporated in the hyperbolic soil model. The response of a system that includes also the nonlinear hysteretic damping cannot be obtained using the classical HBM. This work demonstrates the application of an advanced HBM (more specifically, alternating frequency-time HBM) for finite and infinite systems that exhibit softening behaviour and nonlinear hysteretic damping. The purpose of this model is to, in the future, investigate the influence of the nonlinear hysteretic damping on the response of such systems, as opposed to linear viscous or hysteretic damping that is usually adopted. To conclude, we show that the advanced HBM is an effective tool for revealing fundamental characteristics of continuous systems with softening behaviour and nonlinear hysteretic damping whose stationary responses consist of either standing or propagating waves.","","en","abstract","","","","","","","","","","Engineering Structures","Dynamics of Structures","","",""
"uuid:0c3d6825-2b34-4dd3-927d-e9c78c17869e","http://resolver.tudelft.nl/uuid:0c3d6825-2b34-4dd3-927d-e9c78c17869e","Sensing Opportunities in Integrated Photonics (invited tutorial)","Westerveld, W.J. (TU Delft Dynamics of Micro and Nano Systems)","","2022","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Dynamics of Micro and Nano Systems","","",""
"uuid:2a70a6ae-4ac3-46e5-8243-fdd884f40fd6","http://resolver.tudelft.nl/uuid:2a70a6ae-4ac3-46e5-8243-fdd884f40fd6","A holistic view on avulsion dynamics in a dryland river fan based on comprehensive geomorphological analysis","van Toorenenburg, K.A. (Shell Projects & Technology); Donselaar, M.E. (TU Delft Applied Geology); Weltje, G.J. (Katholieke Universiteit Leuven)","","2022","Dryland river fans form by repeated switching (avulsion) of an ephemeral stream as it progrades and accumulates sediment onto a low-gradient alluvial plain. Successive channel belts are organised in a radial pattern through a process of compensational stacking, where each consecutive river path avoids the positive relief left by its predecessors. Several criteria have been proposed for the likelihood of where and when an active channel in such a setting switches its path, including super-elevation, ratio of along-channel slope and cross-floodplain gradient, and hydraulic capacity of crevasses. A key role for the overbank domain is implied in each of these – largely interdependent – parameters for avulsion proneness, but the exact avulsion dynamics remain insufficiently understood.
In this study, we combine differential-GPS measurements and a resampled open-source global digital surface model (DSM) to quantify along-channel changes in hydraulic parameters and reconstruct subtle geomorphology across an undisturbed and non-vegetated dryland river fan. This approach allows us to propose a holistic view on autocyclic avulsion dynamics in prograding dryland river systems.
The results support the idea that the downstream gradient of an active river decreases over time as result of basinward lengthening (by both progradation and increased sinuosity) mirrored by near-channel deposition. This process gradually decreases the drainage effectiveness of the stream profile and elevates the channel belt relative to the surrounding floodplain. Crevasse splays play a key role in determining whether the river switches or not by effectively testing alternative flow paths. Crevasse channels develop along a local path of steepest descent across the floodplain and build out as long as their stream profile is hydrodynamically more favourable than that of their parent channel, after which they heal up. As the river profile lengthens and rises, crevasse splays extend further onto the floodplain until one reaches base level in a shorter distance than the river itself. At this point, it will receive an increasing proportion of total discharge and the parent river is abandoned. The avulsion process is gradual rather than abrupt and its frequency likely increases downstream, resulting in a dendritic pattern of abandoned river paths.
The process proposed here brings together existing criteria for autocyclic avulsion in prograding dryland river systems devoid of vegetation. It incorporates the role of subtle floodplain morphology and the evolution of crevasse splays and explains the resulting depositional architecture. Moreover, our findings enable us to predict when and where a next avulsion will take place, which could help flood risk analysis and mitigation in similar settings.
• How does the measurement of time affect content moderator’s work?
• How much context is needed to take a content moderation decision?
A sample of 1600 pieces of content was coded according to international and national law, as well as on the Community Standards developed by Meta, mimicking a content moderation scenario that includes lex specialis for content moderation – the German Network.","Content Moderation; Digital Services Act; Artificial Intelligence Act; Human Rights; Explainability","en","abstract","","","","","","","","","","","Organisation & Governance","","",""
"uuid:90edefdf-54a6-45e3-8420-ab757d42d967","http://resolver.tudelft.nl/uuid:90edefdf-54a6-45e3-8420-ab757d42d967","Feasibility Study of Monitoring Delft Geothermal Project Using Land Controlled- Source Electromagnetic Method","Eltayieb, M.F.M.I. (TU Delft Applied Geophysics and Petrophysics); Werthmüller, D. (TU Delft Geoscience and Engineering); Drijkoningen, G.G. (TU Delft Applied Geophysics and Petrophysics); Slob, E.C. (TU Delft Applied Geophysics and Petrophysics)","","2022","Delft geothermal project (DAPwell) is a planned geothermal well doublet, where relatively cold water is going to be injected through one well into a low enthalpy geothermal reservoir to produce hot water from the other well. The volume of the cold water around the injection well will increase over time and, in the end, result in a thermal breakthrough. Thus, it is essential to trace the time-lapse change in the volume of the cold water to monitor the DAPwell efficiently. The invaded reservoir volume by the cold water is associated with a decrease in the pore fluid temperature and salinity. This increases the electrical resistivity of the geothermal reservoir, where the cold front is located. Hence, estimating the time-lapse change in the electrical resistivity of the geothermal reservoir can be used to identify the distribution of the cold water. From a theoretical point of view, the controlled-source electromagnetic (CSEM) method can be used to get information about the change in the electrical resistivity within the geothermal reservoir. In this study, we investigate the feasibility of monitoring a geoelectric model of the DAPwell using land CSEM forward modelling. The optimal survey design is investigated as well as the influence of cold water volumetric changes on the time-lapse electric field response. The impact of measurements undesired effects on time-lapse CSEM response is analysed and then synthesized. A subsurface model of the DAPwell is illuminated by a horizontal electric dipole source, which emits a sinusoidal field with several frequencies. Based on the numerical experiments, surface measurements do not pick up sufficient time-lapse signal to use them for field applications. On the other hand, the difference in the z-component of the electric field, determined along a depth section, allows for a successful detection of the electrical resistivity changes within the geothermal reservoir. The correlation between the spatial distribution of the cold water and the difference in time-lapse electric field responses is clarified. Finally, it is noticed that the difference in time-lapse signal is measurable in the presence of the different sources of noise.","","en","abstract","","","","","","","","","","Geoscience and Engineering","Applied Geophysics and Petrophysics","","",""
"uuid:d21944f9-ed1a-4892-8f30-3c1bbc479035","http://resolver.tudelft.nl/uuid:d21944f9-ed1a-4892-8f30-3c1bbc479035","Refine Conceptual Models in A High Enthalpy Geothermal Field","Suherlina, Lily (ETH Zürich); Bruhn, D.F. (TU Delft Reservoir Engineering); O Saar, Martin (ETH Zürich); Brehme, Maren (ETH Zürich)","","2022","The primary goal of this study is to build new and integrated conceptual models for a high temperature field in Indonesia. Providing new data, combining models, visualizing them in 3D is significant to refine previous 2D traditional models, which are limited for reservoir characterization and wellplacement. During field utilization, constantly updating conceptual models helps to verify the pre-existing models and to renew spatial description of the geothermal system. The new geology models aim to refine the description of subsurface units, the fault models help to renew outdated knowledge on structures, temperature and hydrothermal models aim to eludicate new spatial temperature distribution, and geochemistry models serve to link structures with fluid chemistry. New and pre-exisiting subsurface datasets are investigated, processed in Leapfrog and interpreted integratively. The current geology model confirmed the dominant rock types in the Lahendong reservoir: breccia and andesite with a minor fraction of tuff. Also, it shows the spatial distribution of feed-zones with respect to the geological units. The new fault model revealed that the southern reservoir is more structurally controlled than the northern reservoir. A major thrust fault in the south has a vital role as a fluid pathway because the surrounding rocks have low porosity. The updated temperature models show no changes with respect to the temperature range of 250-350 oC compared to previous studies. However, the current model revealed that the southern reservoir still contains higher temperatures than the northern as evidently manifested by the dome-shape of temperature lines. Recent studies suggested local cooling in the southern reservoir, as suggested by the decline of temperatures around faults. The geochemistry model unveils barrier and conductor structures based on electrical conductivity of fluids The current models significantly improve the former subsurface knowledge/studies. They also support a better reservoir characterization and visualization in 3D. The models will be a proper basis for the onward numerical models to identify reservoir behavior in future production scenarios/ operation.","","en","abstract","","","","","","","","","","","Reservoir Engineering","","",""
"uuid:f18ad86f-7198-4ce0-978d-7be8326ecd6a","http://resolver.tudelft.nl/uuid:f18ad86f-7198-4ce0-978d-7be8326ecd6a","Efficiency in Geothermal Operations: Mixtures as working fluids for ORC Power Plants","Galieti, L. (TU Delft Flight Performance and Propulsion); de Servi, C.M. (TU Delft Flight Performance and Propulsion); Colonna, Piero (TU Delft Flight Performance and Propulsion); Silva, Paolo (Politecnico di Milano); Bombarda, Paola (Politecnico di Milano)","","2022","The use of mixtures in place of pure fluids in Organic Rankine Cycle (ORC) power plants is proposed as a possible improvement in terms of efficiency, environmental benefit and safety of the system. In particular, zeotropic mixtures exhibit a temperature variation (or glide) during phase change, because the components have different boiling points. This temperature glide improves the temperature profile matching in the heat exchangers and could in turn increase the overall thermoeconomic efficiency of the power plant, especially if it is air cooled. Even though the solution is theoretically beneficial, its practical feasibility has still to be proven. To this scope, we developed an optimization algorithm that determines the optimal mixture composition and thermodynamic parameters of the cycle and performs the preliminary design of the air cooler of the power plant. As initial case study we chose a heat recovery application and ran single objective optimizations to select the binary mixture that maximizes the power plants thermodynamic efficiency. Initial results show that, when the ratio between the turbine and fan power is high and the maximum temperature is constrained by fluid stability considerations, mixtures with low or no glide are the most efficient. The optimization procedure will eventually be extended to include also the economic aspect and additional studies will be performed for the geothermal application, where mixtures are expected to be much more beneficial due to the lower temperature of the heat source.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:ded5119f-a9ca-45ff-a7fb-395e43ea284f","http://resolver.tudelft.nl/uuid:ded5119f-a9ca-45ff-a7fb-395e43ea284f","Numerical Study of Fluid Loss into a Thief Zone overlying a Geothermal Reservoir","Luo, W. (TU Delft Geo-engineering); Vardon, P.J. (TU Delft Geo-engineering); Cox, Barbara (Hydreco Geomec); Dieudonné, A.A.M. (TU Delft Geo-engineering)","","2022","and boundary connected with aquifer respectively, are discussed. On the basis of these two boundary conditions, several factors that influence the fluid loss process are studied. For the thief zone with no-flow boundary, our key conclusions illustrate that once the pressure front reaches an opening in the sealing, fluid loss occurs. However, fluid loss is substantially limited (leakage rate lower than 0.02 m3/h) within one year of operation. The time at which leakage is limited, is controlled by the permeability shock between the thief zone and reservoir, transmissivity of fracture in sealing layer and injection pressure. In addition, only the injection pressure has a significant influence on the total amount of lost fluid, while the permeability shock and fracture conductivity do not influence it. However, more permeable thief zone and more conductive fracture could be helpful to quickly prevent the fluid loss, since the pressurisation up process can be achieved more quickly, and thus prevent the leakage in the early stage, ensuring a stable injection rate in the long term . In contrast, for the thief zone with fixed-pressure boundary, fluid loss does not stop. Instead, it keeps a constant leakage rate, indicating a continuous fluid loss. However, the increase in fluid pressure remains more limited. In this case, a more permeable thief zone, more conductive opening and higher injection pressure increase the leakage rate, yet reduce the elevated pressure. In conclusion, leakage can be prevented as a result of pressurization up of thief zones sealed by faults, and the only thing to consider in the planning stage is how fast it can be. While for thief zones linked with aquifers, injection plan should be made carefully to avoid induce or promote any fractures in sealing layer, or continuous leakage would occur.","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:15eb916a-58a8-4b03-92eb-0da192a0b24b","http://resolver.tudelft.nl/uuid:15eb916a-58a8-4b03-92eb-0da192a0b24b","Seismic monitoring of Nature’s Heat Geothermal Project in Kwintsheul (Netherlands)","Naranjo, D. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Weemstra, C. (TU Delft Applied Geophysics and Petrophysics)","","2022","In 2018, a geothermal doublet started operating in Kwinstheul, Netherlands, for supplying heat to 64 hectares of greenhouses corresponding to Nature’s Heat joint initiative. This kind of geothermal operation requires extraction, circulation, and reinjection of fluids at a depth of 2.4 km. The reservoir used for the geothermal operation has shown good hydraulic parameters which allow the circulation of the fluid. Several authors agree that this kind of geothermal operation is unlikely to generate felt seismicity, nevertheless, adequate seismic monitoring is critical to guarantee sustainable and safe use of the subsurface. To monitor the operation of Nature’s Heat project, 30 three-component short-period seismic sensors were installed by Delft University of Technology and Seismotech (Greece). A challenge for seismic monitoring in Kwinstheul is the high levels of seismic noise coming from anthropogenic and operational activities. Despite the high background noise levels, a seismic event of Md 0.16 was recorded on July 14, 2019. To understand the relation of the event and improve the safety of the geothermal operation, we are developing an optimized monitoring scheme.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:1049a021-df6e-4d74-bd29-bf3b00de350b","http://resolver.tudelft.nl/uuid:1049a021-df6e-4d74-bd29-bf3b00de350b","Clogging mechanisms in geothermal operations: a case-study of a geothermal field in the Netherlands","Kottsova, A. (TU Delft Reservoir Engineering; ETH Zürich); Bruhn, D.F. (TU Delft Reservoir Engineering); O Saar, Martin (ETH Zürich); Brehme, M. (TU Delft Reservoir Engineering; ETH Zürich)","","2022","The number of geothermal operations worldwide has been actively growing over the last decades. To increase their efficiency, prevent reservoir depletion and avoid environmental issues, produced water is commonly reinjected. Despite these benefits of fluid reinjection, various clogging problems resulting in injectivity decline have been reported by field operators. Research on individual clogging mechanisms is published in various studies. However, fluid injectivity problems are still widely faced, leading to decreased overall productivity and even abandonment of some wells. Therefore, it is essential to better understand reasons of fluid pathway clogging processes and especially their interactions to efficiently predict and prevent them. In this research, we present a theoretical analysis of different clogging mechanisms. The influence of various parameters on different clogging mechanisms from existing experimental studies and field reports has been reviewed and summarized. Additionally, we compared these experimental literature concepts with a real case study of a running geothermal field facing clogging problems in the Netherlands. The study includes a detailed analysis of production data, as well as fluid and filter sample analyses. Results show correlation patterns between concentration changes of chemical species in the fluid, as well as influence of injection parameters (temperature, flow rate) on injectivity. The outcomes were compared to literature examples to generalize the conclusions. This will allow an improved understanding of processes occurring in geothermal fluids during fluid production and reinjection. As a next step of this research, more field data will be analyzed to identify similar trends and correlations as well as the interdependency of injectivity problems.","","en","abstract","","","","","","","","","","","Reservoir Engineering","","",""
"uuid:5796dba9-bd5c-411e-9cf0-24a0b1083806","http://resolver.tudelft.nl/uuid:5796dba9-bd5c-411e-9cf0-24a0b1083806","Aquifer thermal energy storage triplet: Moving towards self-sufficient space heating and cooling","van Esch, M.S. (TU Delft Geo-engineering); Bloemendal, Martin (TU Delft Water Resources; KWR Water Research Institute); Hartog, Niels (KWR Water Research Institute); Vardon, P.J. (TU Delft Geo-engineering)","","2022","Aquifer Thermal Energy Storage (ATES) is mostly used to store heat and cold in groundwater at relatively low temperatures for heating and cooling buildings. These systems emit 3-4 times less CO2 when compared to gas heating, but still require substantial amounts of electricity to run due to the use of a heat pump ( 60%). In typical ATES systems in the Netherlands, when there is a cooling demand, groundwater is pumped from the cold well for cooling, raising the temperature of the water to 18°C which is then injected in the warm well. When there is a heating demand water is pumped from the warm storage well and concentrated using a heat pump to the required heating temperature of the building (40-50°C). This process typically cools down the water to 7°C which is then injected into the cold well. Storing groundwater at a temperature that matches the required heating and cooling temperature can reduce or eliminate the need for a heat pump. This can be achieved by using sustainable sources to supply the heat and cold from the environment (e.g. solar panels, dry coolers). However, the availability of these sources can be insufficient to reach the required temperature level. Therefore a third well is added where water at the return temperature after building heating or cooling is stored, until it can be again heated or cooled to temperatures matching the demand. This is the concept of an ATES triplet. Initial simulations are presented which showa factor of 10 reductions in CO2 emissions compared to conventional systems, while the systems are calculated to have an improved economic performance, although require a higher initial investment. Further research will investigate the subsurface and above ground system layout and operational conditions which impact the economic and environmental performance (CO2,thermal efficiency and pollution).","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:acd3952a-e5fa-41a1-8517-6771b652ed32","http://resolver.tudelft.nl/uuid:acd3952a-e5fa-41a1-8517-6771b652ed32","Readiness for Re-Use of Open Government Data for Solving Societal Problems Based on Public Participation: Kindergartens in the City of Zagreb","Kević, Karlo (University of Zagreb); Miletić, Andrea (University of Zagreb); Kuveždić Divjak, Ana (University of Zagreb); Welle Donker, F.M. (TU Delft Urban Data Science)","","2022","Over the last decade, open data has become a hot topic that researchers and governments all over the world are eager to explore. The term first appeared in a 1995 document from an American scientific agency (Chignard, 2013), but its popularity increased when the U.S. president, Barrack Obama, signed the 2009 Memorandum on Transparency and Open Government, pledging to achieve an unprecedented level of openness in government (Obama, 2009). This memorandum emphasized the importance of creating a system of transparency, public participation, and collaboration through openness.","open data; User perspective; assessment; sociatal problems; Kindergartens","en","abstract","","","","","","","","","","","Urban Data Science","","",""
"uuid:829e405e-da89-4f25-9ae4-fed766cf8614","http://resolver.tudelft.nl/uuid:829e405e-da89-4f25-9ae4-fed766cf8614","Depositional and Diagenetic Heterogeneity Control on Aquifer Quality: a Case Study of the Lower Triassic Sandstones in the Southeastern Part of Netherlands","Cecchetti, E. (TU Delft Applied Geology); Martinius, A.W. (TU Delft Applied Geology; Equinor ASA); Felder, M (Panterra Geoconsultancs); Abels, H.A. (TU Delft Applied Geology)","","2022","A combined study of depositional facies and diagenesis variation was carried out to understand the main controls on aquifer quality of the Middle Buntsandstein in the southeastern part of the Netherlands. Heterogeneities in continental sandstone bodies occur at different spatial scales, ranging from micrometers to hundreds of meters. Commonly, such heterogeneities result from the interaction of depositional processes at various spatial and time scales. These processes partially also influence subsequent diagenetic evolution, hence present-day aquifer properties. Understanding the role of the resulting architectural heterogeneities in controlling the dynamic reservoir behavior is key in determining aquifer properties and improving pre-drilling prediction. The sandstones of the Main Buntsandstein subgroup in the southeastern part of the Netherlands provide an excellent example where different detrital compositions, internal sedimentary architectures, and diverse burial histories have resulted in a wide range of present-day aquifer properties. In the study area, the aquifers are composed of stacked heterogenous alluvial sandstones bodies intercalated with mud-prone intervals deposited in arid to semi-arid conditions. Differences in sediment sources, transport mechanisms, and intrabasinal conditions resulted in a wide distribution of composition and texture. Additionally, the effect of post-depositional burial diagenesis in a basin with complex tectonic history created diverse burial histories across the basin. The study aims to investigate the variation of present-day aquifer hydraulic parameters about changes in aquifer facies and architecture, detrital composition, as well as compaction and cementation during burial. Core sample analysis unfolded a diverse spectrum of sedimentary facies and lithic fragments, which differ between formations. Thin section analysis provides insights about mechanical compaction, cementations, and authigenic phases. By combining these results with petrophysical data on permeability and porosity of core samples, the major controls on present-day aquifer quality can be assessed.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:2970cf09-7d70-40a8-bc14-d16708eeea47","http://resolver.tudelft.nl/uuid:2970cf09-7d70-40a8-bc14-d16708eeea47","Improving Geothermal and Thermal Reservoir Property Prediction of Dutch Geothermal Plays","Kolah Kaj, P. (TU Delft Applied Geology); Abels, H.A. (TU Delft Applied Geology); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Vardon, P.J. (TU Delft Geo-engineering); Kwee, Jasper (IF Technology); Buik, Nick (IF Technology); de Vries, Sjoukje (Energie Beheer Nederland); Drury, Martyn (Universiteit Utrecht); van Eindthoven, Wijnand (DeepAtlas)","","2022","The ambition is to significantly enhance the knowledge, mapping, and prediction of the geological character of Dutch geothermal plays, focussing on thermal and geomechanical properties. The aim is to improve fundamental understanding of the geological causes behind rock properties, the understanding and quantification of the conversion of downhole log responses into rock properties, the statistical approaches to study these properties, and the implementation of rock properties into reservoir models. The study aims at leading to lower research costs for geothermal operators, lower uncertainties concerning production prediction and risk assessment, and improved productivity due to more optimal well placement and production strategies. With that, our fully open-access results will be applicable to all geothermal targets in the Netherlands and thereby be able to calibrate reservoirs, geomechanical and thermal reservoir models with the ultimate goal to optimise the exploitation of geothermal heat in the Netherlands in a sustainable and safe way. The project has a measuring component producing data and geological understanding, a correlating component, linking rock properties to petrophysical log data by various innovative means, and an implementation component setting the findings into geomodel application. Novel microstructural scanning data enables to link the nano-scale rock composition to decimetre scale bedding and logs. The focus will be on pore throats, detrital, authigenic, and new-grown cement and their types and how these relate to flow, and in particular thermal, and mechanical properties of the rocks. Next, petrophysical downhole logging data will be analysed using statistical and machine learning techniques to produce a much enhanced methodology to relate petrophysical log responses to different rock properties. Improved correlations will be produced per play investigated and can be applied to clastic geothermal reservoirs in general. This will allow for quick and improved screening of rock properties through different wells and finally beyond those into white spots.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:9619b816-f0cd-4174-9619-676efb481807","http://resolver.tudelft.nl/uuid:9619b816-f0cd-4174-9619-676efb481807","NCORS Open Data Ecosystem: Beyond Open Data!","Supinajaroen, W. (TU Delft Urban Data Science); van Loenen, B. (TU Delft Urban Data Science); Korthals Altes, W.K. (TU Delft Urban Development Management)","","2022","","Open data; NCORS; GNSS; Thailand; ecosystem","en","abstract","","","","","","","","","","","Urban Data Science","","",""
"uuid:22759e9a-510e-44c1-8ec8-d2bb8ae5c37b","http://resolver.tudelft.nl/uuid:22759e9a-510e-44c1-8ec8-d2bb8ae5c37b","Unlocking the Flexibility of District Heating Pipeline Energy Storage with Reinforcement Learning","Stepanovic, K. (TU Delft Algorithmics); Wu, J. (Flex Technologies); Everhardt, Rob (Flex Technologies); de Weerdt, M.M. (TU Delft Algorithmics)","","2022","","4th generation district heating;; combined heat and power economic dispatch; Markov decision process; Q-learning; pipeline energy storage; mixed-integer nonlinear program","en","abstract","","","","","","","","","","","Algorithmics","","",""
"uuid:8f93b028-7b3e-432e-ae99-021c911272a3","http://resolver.tudelft.nl/uuid:8f93b028-7b3e-432e-ae99-021c911272a3","How Does a River Bifurcation System Respond to Peak Flows? A Case Study of the Upper Dutch Rhine Bifurcation Region","Chowdhury, M. Kifayath (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Verbeek, Merel C. (Rijkswaterstaat); Schropp, Max H.I. (Rijkswaterstaat); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2022","Sediment transport capacity and supply of sediment to a river channel increase significantly during peak flow events. Here we study how a river bifurcation system (partitioning water and sediment over its downstream branches) responds to peak flow events. We focus on the Pannerdense Kop bifurcation in the Dutch Rhine River, an engineered system where planform and channel width are fixed. We analyze water discharge and bed level data measured over the last century. We observe rapid aggradation in one of the branches (Pannerden Channel) following the peak flow events of 1993 and 1995, and little to no bed level change in the other branch (Waal). Prior to the event, both branches eroded, and the upstream part of the Pannerden Channel had a greater erosion rate than the Waal. After the 1993 and 1995 peak flow events, the erosion in the upstream part of the Pannerden Channel slowed significantly, whereas the upstream part of the Waal branch continued to erode (though at a smaller pace than before the peak flow events). This differential erosion has resulted in a gradual increase of water discharge toward the Waal branch. Interestingly, the bifurcation system does not appear to respond equally to all peak flow events. We hypothesize that the bifurcation response to the 1993 and 1995 peak flows differs from previous peak flows because of the sequence of the two events. Between the 1993 and 1995 events, the system may not have had sufficient time to disperse the sediment deposited at the upstream end of the Pannerden channel. Another reason for the response to the 1993 and 1995 peak flows to differ from previous events may be that the channel bed surface within the region of interest has coarsened significantly. This study illustrates the importance of peak flows regarding bifurcation dynamics, and further research is focused on the interaction between bifurcation dynamics and the dynamics of the larger-scale system.","River bifurcation; Pannerdense Kop; Peak flow; Rhine River; Dutch Rhine","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-06-16","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:470f8f06-d7b0-4308-8566-7cc67df996d5","http://resolver.tudelft.nl/uuid:470f8f06-d7b0-4308-8566-7cc67df996d5","Design Recommendations for Safer Election Campaigning Online","Sekwenz, M.T. (TU Delft Organisation & Governance); Wagner, Ben (TU Delft Organisation & Governance)","","2022","The internet is a place where the political opinion of voters is ever more formed on platforms and their user-generated content globally. A sphere in which the right to free- dom of expression, information and free and fair election are core human rights normative safeguards for our democracy. Securing this process for whoever is not an easy task, as examples like the 2016 US election, the Brexit campaign or the events of the 6th of Jan- uary 2021 illustrate. The European Union has taken regulatory action to secure the digital manifestations of elections, by issuing legislation like the General Data Protection Regu- lation, the Artificial Intelligence Act, the Digital Services Act (DSA)or the Proposal for a regulation of the European Parliament and the European council on the transparency and targeting of political advertising. The aim is to make platforms more transparent, regarding their algorithms deciding on recommendations, price of the ad, or to standardize content moderation to a certain degree. Platforms on the other hand use their Terms of Service (ToS) to implement their Community Standards – a selection of law-like clauses allowing for deletion or blocking of content – to set quasi-norms to safeguard democracy on- line. The ToS used by very large platforms (VLOP) according to Art 25 DSA however does not include granular clauses for European campaigning. The more recent design solutions on platforms include advertising repositories, or warning labels attached to problematic content to better inform the public. However, moderation of content addressing the heart of democracy and the democratic process per se is crucial for the status of human rights in Europe. The first decision taken on a piece of content – if it should be uploaded on the platform or not – is usually automated and controlled by machine learning algorithms. The system in place selects the pieces of content that will be decided upon in the next process step by a human. The moderation of political speech, however, is not solely text-based but does include a fine line of sarcastic elements, emojis or visual content to express itself which is another obstacle to moderating in an electoral context. This article, therefore, asks the question about how to better safeguard the right to fair elections, the right to freedom of expression and information in online campaigning and elections adhering to the recent European legislation, such as the GDPR, the DSA and the AIA and the proposal on the transparency and targeting of political advertising? The article answers the question by taking a closer look at the publicly available data published by platforms on behalf of their transparency reports. Furthermore, the ToS and Community Standards should be analyzed and compared. The process and architecture of content moderation for the selected online platforms are described and modelled according to the publicly available information. Only by providing a more concrete look at content moderation design and practice better solutions for the digital future of democracy can be crafted.","","en","abstract","","","","","","","","","","","Organisation & Governance","","",""
"uuid:045701b5-6549-4c0f-a89b-61d9cf56fc4a","http://resolver.tudelft.nl/uuid:045701b5-6549-4c0f-a89b-61d9cf56fc4a","Perceived object motion variance across optical contexts","van Assen, J.J.R. (TU Delft Human Information Communication Design); van Zuijlen, M.J.P. (Kyoto University); Nishida, Shin'ya (Kyoto University; Nippon Telegraph and Telephone Corporation)","","2022","Visual motion computation is challenging under real-world conditions due to continuous contextual changes such as varying lighting conditions and a large range of optical material properties. Due to these changes the retinal optical flow can drastically vary while the physical motion of an object remains constant. Especially materials with high reflective and refractive interactions can cause complex motion patterns. Here we investigate object motion constancy across various optical contexts and if the human visual system compensates for other causal sources in motion.
We performed two experiments. In the first experiment observers had to estimate which of two stimuli was rotating faster around the vertical axis. The stimuli were displayed for 500 ms in a 2-IFC staircase design. For the Match stimulus the illumination, material properties and shape were constant. The stimulus was rendered at a high temporal resolution allowing for small rotational speed changes for the staircase design. The Test stimuli varied in ten optical properties (e.g., matte, glossy, anisotropic, translucent), three illumination maps (sunny, cloudy, indoor), and three shapes (knot, cubic, blobby), the rotational speed remained constant. There were three different conditions in the second experiment: 1. unmasked Match and Test stimulus (same as experiment one); 2. masked Test stimulus (circular gaussian mask, masking outer shape contours); 3. masked Test stimulus and masked Match stimulus where the Match stimulus was replaced by horizontally moving 2D pink noise. In this experiment a subset of the optical conditions was used.
Expanding on our previously presented work [1], we applied three image-based motion capturing models (Figure 1) to gain deeper insights on motion cues that are predictive of human judgements. The models are Lucas-Kanade (optical flow), RAFT (optical flow DNN), FFV1MT (motion energy). First, we found that there are clear illusory differences of perceived rotational speed with even bigger effects when the circular mask was applied. The transparent material with the refractive index of water is systematically perceived to be rotating faster than other materials across all conditions. We performed an RSA (representational similarity analysis) to compare a range of different metrics across conditions and flow models. We find that the gradient of the optical flow is a particularly good predictor of human performance. The gradient emphasizes local speed changes in the optical flow, for example with moving highlights. Another observation is that Lucas-Kanade is most predictive of human performance under most conditions while RAFT is most stable across materials and closest to the ground truth. Our results further suggest that the human visual system does partially compensate for motion flow effects across optical contexts in object motion.
[1] Van Assen, J. J. R., Kawabe, T., & Nishida, S. Y. (2020). Object motion and flow variance across optical contexts. Journal of Vision, 20(11), 458-458.
This work has been supported by a Marie-Skłodowska-Curie Actions Individual Fellowship (H2020-MSCA-IF-2019-FLOW) and by JSPS Kakenhi JP20H05957.","motion; perception; Psychophysics","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-06-01","","","Human Information Communication Design","","",""
"uuid:ceae6e1e-7038-47c8-92e9-844999cb8048","http://resolver.tudelft.nl/uuid:ceae6e1e-7038-47c8-92e9-844999cb8048","Using a Virtual Coach to Quit Smoking: 14 Themes for User Needs","Albers, N. (TU Delft Interactive Intelligence); Neerincx, M.A. (TU Delft Interactive Intelligence; TNO); Penfornis, Kristell M. (Universiteit Leiden); Brinkman, W.P. (TU Delft Interactive Intelligence)","","2022","","Conversational agent; Virtual coach; Behavior change","en","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:6bcbacb2-69e5-4695-86de-454ea980b1ce","http://resolver.tudelft.nl/uuid:6bcbacb2-69e5-4695-86de-454ea980b1ce","Back to Roots: Reconsidering Data-As-Resource to Introduce a Commons-Based Modulating Approach to Open Data","Calzati, S. (TU Delft Urban Data Science)","","2022","This paper takes the lead from the acknowledged ongoing mismatch between open data provision and actual open data demand by users, both public and private. To tackle such mismatch, the paper suggests remodulating data openness through a commons approach, which seeks to account for all data actors’ needs, while maintaining their interests in balance. In other words, data commons enacts an ecosystemic approach by default to data provision and demand, whereby data actors and their relations are mutually co-dependent. Yet, the application of the concept of the commons to data is not straightforward. This is due to data’s hybrid nature, which requires reconsidering the normative understanding of data as a resource, if we really want to develop a governance model that is beneficial to all actors and the whole data ecosystem. Building on recent literature in this direction, the paper will briefly outline the pillars of a commons-based data ecosystem.","data commons; data ecosystem; data resource; open data; openness modulation; EU","en","abstract","","","","","","","","","","","Urban Data Science","","",""
"uuid:23f39fd2-710f-4519-b718-9a34190c99ef","http://resolver.tudelft.nl/uuid:23f39fd2-710f-4519-b718-9a34190c99ef","Operationalizing Justice in Integrated Water Resources Modeling and Management","Yalew, S.G. (TU Delft Policy Analysis); Kwakkel, J.H. (TU Delft Policy Analysis); Zatarain Salazar, J. (TU Delft Policy Analysis); Doorn, N. (TU Delft Ethics & Philosophy of Technology)","","2022","Justice in the allocation and distribution of water is one of the most recent topics in the water resources management literature. This topic, i.e., justice/equity/fairness, is especially noteworthy in integrated water resources management where competing needs, sectors, and societal segments are involved in the utilization of water. Although the concept of justice, such as procedural justice, in general and in water management in particular is not as new, the concept of distributive justice and tools and technics for the allocation and distribution of water resources is very recent. As a result, particularly tools and techniques for the operationalization of such concepts are still lacking.
In this study, we operationalized theoretical justice theories in terms of moral principles into functions and parameters for use with traditional water resources optimization models and frameworks. These moral principles include Utilitarianism (which evaluates measures according to their effect on welfare), Sufficientarianism (which makes sure that each individual gets a sufficient threshold), Prioritarianism (which guarantees extra weight to worse-off individuals), and envy-freeness (which requires that each individual prefers his share to the share of others).
The result of the study as applied in the case study of the Susquehanna basin, USA, displays undertanding and outlooks of various perspectives of fairness on integrated water resources management among competing stakeholders and needs. Such perspectives are presented together with traditional resource efficiency and/or conservation oriented optimization techniques and methods to highlight synergy and trade-offs in integrated water resources management. We think that the methods and approaches presented here will advance the scientific discussion on the operationalization of justice/equity/fairness in real-world modeling and management of integrated water resources.","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:5d084b2e-d41c-43d5-a984-144e80180fd2","http://resolver.tudelft.nl/uuid:5d084b2e-d41c-43d5-a984-144e80180fd2","Distributive justice principles for integrated assessment models: a comparative study on interregional justice","Akoluk, D. (TU Delft Policy Analysis); Zatarain Salazar, J. (TU Delft Policy Analysis); Verbraeck, A. (TU Delft Policy Analysis)","","2022","Justice in the climate context has gained more attention in the last decade. One of the main reasons is the increasingly pervasive and aggressive impact of climate change on societies and economies. Existing inequalities and disparities between sectors, regions, and generations are often exacerbated by proposed or applied policies. Hence, protecting different groups’ rights becomes more and more necessary in the climate change adaptation and mitigation policies. It is therefore essential to understand the subjective notions of the ethical principles that underlie the policies, by categorically examining these principles before taking action.
For this reason, this study explored different distributive justice principles in integrated assessment models using a descriptive approach. It resulted in a classification of the five most common ethical principles: Utilitarianism, Rawlsianism, Egalitarianism, Prioritarianism, and Sufficientarianism. These principles have been operationalized to find the optimal climate policy for future emissions. The principles have been applied to the Regional Integrated Climate-Economy (RICE) model for a comparative analysis on interregional justice.","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:fd7d0e8e-065b-485b-a73a-2a01a0697add","http://resolver.tudelft.nl/uuid:fd7d0e8e-065b-485b-a73a-2a01a0697add","Simplifying lines for the creation of a Space-Scale Cube","Meijers, B.M. (TU Delft Digital Technologies); van Oosterom, P.J.M. (TU Delft Digital Technologies)","","2022","","","en","abstract","","","","","","","","","","","Digital Technologies","","",""
"uuid:7623153b-eda7-4ab6-97fe-263c343c8268","http://resolver.tudelft.nl/uuid:7623153b-eda7-4ab6-97fe-263c343c8268","Phase behaviour study of epoxy asphalt binders with differential scanning calorimetry","Apostolidis, P. (TU Delft Pavement Engineering)","","2022","The glass transition parameters are used to study the miscibility, or lack of it, in polymer modified asphalt binders. In this study, a
quantitative assessment of the contribution of thermodynamics of mixing to glass transition was conducted in a differential scanning
calorimetry for four asphalt binders modified with an elastomeric epoxy system. Especially, the values of heat capacity (Cp)
and subsequently the glass transition temperature (Tg) of all binders were determined to quantify the miscibility based on the
entropic changes. Emphasis was also given on examining the enthalpy of mixing as a function of the composition of epoxy asphalt
binders during curing to ensure that these binders were completely crosslinked for further analyses. In all cases, the positive deviations
of Tg,mix obtained from the ideal mixing rule, or ΔT_(g,mix), led to negative values of the entropy of mixing (ΔS_mix^c),
dictating the presence of internal repulsive forces between the asphalt and epoxy components. The soft in properties and sol type
base binders are also associated with epoxy asphalt binders of low ΔT_(g,mix) values. Overall, the incorporation of the epoxy system
in asphalt binders increases the Tg and decreases the amount of ΔS_mix^c, and such performance imposes the formation of
phase‐separated binders.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-01-21","","","Pavement Engineering","","",""
"uuid:a7ae387e-0d40-43ec-8237-567581990da2","http://resolver.tudelft.nl/uuid:a7ae387e-0d40-43ec-8237-567581990da2","Insight into the compatibility behaviors between various rejuvenators and aged bitumen: Molecular dynamics simulation and experimental validation","Ren, S. (TU Delft Pavement Engineering)","","2022","The compatibility potential of rejuvenators plays an important role in improving the blending degree of rejuvenated bitumen. This study aims at estimating the efficiency of molecular dynamics (MD) simulation in predicting the compatibility between rejuvenators and aged binders, and exploring the influence of rejuvenator type, aging degree of bitumen, and temperature on the compatibility potential. The thermal stability of rejuvenated binders is evaluated to validate the compatibility prediction, and the underlying mechanism for the thermal stability difference between rejuvenators and aged bitumen is explained with the atomic‐scale parameters. The results revealed that the ranking on predicted compatibility and experimentally measured thermal stability for four rejuvenators is the same as AO > BO > NO > EO. The thermodynamic parameters of solubility parameter difference Δδ, Flory‐ Huggins parameter χ, and mixing free energy ΔGm are efficient to estimate the compatibility potential of various rejuvenators with aged bitumen. Moreover, the separation index (SI) parameters based on rheological and chemical indices are available to assess the thermal stability of rejuvenated bitumen. At the molecular scale, the compatibility and thermal stability issues between rejuvenators and aged bitumen are complicated and related to different aspects of the intermolecular interaction, dispersion degree, and molecular mobility.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-01-21","","","Pavement Engineering","","",""
"uuid:23ead287-d1a1-43ea-9e82-0d4cf0b80a04","http://resolver.tudelft.nl/uuid:23ead287-d1a1-43ea-9e82-0d4cf0b80a04","Development of a GPC Chromatograms Decomposition Method for Identifying and Quantifying the Degradation of SBS Polymer Modified Bitumen","Lin, P. (TU Delft Pavement Engineering)","","2022","SBS polymer modified bitumen (SPMB) can notably improve the performance of asphalt pavement and is widely employed on the surface layer of pavements. However, SBS polymer is sensitive to ageing and its degradation evolution is difficult to be quantitatively characterized due to the overlapping of GPC chromatograms. In this research, a chromatogram decomposition method (CDM) is proposed based on a combination of experimental quantitative analysis and mathematical deconvolution methods, which target simultaneous identification and quantification of degraded SBS polymers in SPMB. According to the experimental and analysis results, the overlapped chromatograph peaks of 24 different SPMB binders (different SBS contents, base bitumen types and ageing levels) were successfully decomposed and the degraded SBS polymer was quantitively analyzed by the CDM method. Meanwhile, the CDM analysis parameters of SPMB binders demonstrated a good correlation with the rheological characterization results, indicating the validity of the proposed CDM method. These results revealed the degradation process of SBS polymer during the aging of SPMB, and also provide a promising analytical strategy for the polymer modified bitumen with overlapped GPC chromatograms.
We illustrate the potential of SI with active-source data from numerical acoustic modelling using the Groningen subsurface model. This model describes the natural gas field located in the Groningen province in the northeastern part of the Netherlands. The reservoir of the Groningen gas field is located at depths between 2600 m and 3200 m, the total thickness ranges from approximately 100 m to 300 m. The Groningen field is cut by several fault systems, subdividing the field into a large number of fault blocks, and it is a clear example of induced seismicity by gas production.
We investigate the utilization of non-physical reflections retrieved from surface active-source data using SI by cross-correlation and auto-correlation. With multi-offset gathers, besides physical reflections, we retrieve non-physical reflections as well; by muting undesired reflections, we can retrieve better target-related non-physical reflections. To illustrate the potential of the non-physical reflections for monitoring purposes, we apply velocity changes in the Groningen reservoir. With zero-offset gathers, which are retrieved from SI by auto-correlation, we show that in case of velocity changes, the non-physical reflections show a clear change; furthermore, they show a good agreement with the geometry of specific subsurface layers, specifically with the faulted structure. Thus, we can utilize non-physical reflections for imaging and monitoring in the Groningen reservoir.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:2199086c-d10c-4208-888c-7915d39065fd","http://resolver.tudelft.nl/uuid:2199086c-d10c-4208-888c-7915d39065fd","Collagenous Bioadhesives: Structure-Property Correlations and Hygrothermal Ageing","Mosleh, Yasmine (TU Delft Bio-based Structures & Materials); Gard, W.F. (TU Delft Bio-based Structures & Materials); Breebaart, Iskander (Rijksmuseum); van de Kuilen, J.W.G. (TU Delft Bio-based Structures & Materials; Technische Universität München); Van Duin, Paul (Rijksmuseum); Poulis, J.A. (TU Delft Adhesion Institute)","","2022","Collagen-based bioadhesives, also known as animal glues, are derived from animal parts (e.g. skin, bone, and cartilage). They have been widely used in the production of decorative wood working, paintings, bookbinding, and other historical objects for centuries as well as for their restoration and preservation [1].
Collagen, in which the term (kólla) is derived from the Greek word for glue, is a fibrous structural protein with a hierarchical microstructure at different length scales. Collagen is water insoluble and can be turned into water-soluble gelatine through the denaturation process. Upon denaturation, the triple helix structure in collagen unwinds and turns into random coils giving gelatinous animal glue. Gelatinous animal glue can be dissolved in water and during gelling and subsequent drying, the random protein coils undergo partial renaturation back into triple helices. These triple helices in the adhesive act as physical cross-links leading to a continuous three-dimensional network structure [2]. These microstructural features affect the physical and mechanical performance of the glue at micro and macro scales.
In this study four different adhesives from different animal species both mammalian and fish are investigated. These adhesives are bovine bone, bovine skin, rabbit skin, and fish. For this study, thin films of these adhesives were manufactured using the solution casting method. Physical and mechanical behaviour of the adhesives were characterized using Differential Scanning Calorimetry (DSC), X-ray diffraction (XRD), Bloom strength evaluation, and uniaxial tensile tests.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-01-06","","","Bio-based Structures & Materials","","",""
"uuid:a36590f8-d4ba-46d7-9bb7-aca22fbea945","http://resolver.tudelft.nl/uuid:a36590f8-d4ba-46d7-9bb7-aca22fbea945","Optimal network electrification plan for operation of battery-electric multiple unit regional trains","Kapetanović, M. (TU Delft Transport and Planning); Bešinović, Nikola (TU Delft Transport and Planning); Nunez, Alfredo (TU Delft Railway Engineering); van Oort, N. (TU Delft Transport and Planning); Goverde, R.M.P. (TU Delft Transport and Planning)","","2022","The Netherlands have one of the highest rail electrification rates in the EU with over 75% of the railway network electrified (European Comission, 2018), offering environment-friendly trains operation. However, in order to achieve carbon neutral railway sector by 2050, significant investments are required to further improve environmental performance from trains operation, especially in regional nonelectrified networks with passenger services typically provided by diesel multiple unit (DMU) vehicles. Due to their low utilization, full electrification of such networks is often not economically viable, thus solutions are mainly sought in alternative propulsion system technologies, such as hydrogen fuel-cell multiple unit (FCMU) and battery-electric multiple unit (BEMU) vehicles (Klebsch et al., 2019). One of the main challenges in introducing BEMU trains is determining the electrification plan for the railway network, while satisfying requirements related to quality of service, maintaining current timetable, and vehicle-specific constraints. Previous research on BEMUs operation is mainly focused on continuous partial lines electrification, or eventually limited scenario analysis on intermittent electrification (Abdurahman et al., 2021), with the optimization-based methods still lacking in the literature. This study aims to fill this gap by proposing a method for developing an optimal electrification plan, while minimizing total costs and considering several electrification alternatives for each track section.","battery-electric multiple unit; regional railway transport; partial electrification","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Transport and Planning","","",""
"uuid:88c9b403-42a4-4f3f-80f4-e859f881b672","http://resolver.tudelft.nl/uuid:88c9b403-42a4-4f3f-80f4-e859f881b672","Functional Motion Range of Hand Joints Can Exceed Active Motion Range","Yuan, T. (TU Delft Mechatronic Design); Song, Y. (TU Delft Mechatronic Design); Kraan, Gerald A. (Reinier de Graaf Gasthuis); Goossens, R.H.M. (TU Delft Human-Centered Design; TU Delft Applied Ergonomics and Design)","","2022","This study measured the active range of motion (AROM) and functional range of motion (FROM) of finger joints and explored the relationships between them. The results revealed that the AROM cannot fully cover the FROM in some scenarios with force.","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Human-Centered Design","Mechatronic Design","","",""
"uuid:6a01c505-f21e-43c5-b472-bc93ee5a1a16","http://resolver.tudelft.nl/uuid:6a01c505-f21e-43c5-b472-bc93ee5a1a16","Modelling Trust in Human-AI Interaction: Doctoral Consortium","Mehrotra, S. (TU Delft Interactive Intelligence)","","2021","Trust is an important element of any interaction, but especially when we are interacting with a piece of technology which does not think like we do. Therefore, AI systems need to understand how humans trust them, and what to do to promote appropriate trust. The aim of this research is to study trust through both a formal and social lens. We will be working on formal models of trust, but with a focus on the social nature of trust in order to represent how humans trust AI. We will then employ methods from human computer interaction research to study if these models work in practice, and what would eventually be necessary for systems to elicit appropriate levels of trust from their users. The context of this research will be AI agents which interact with their users to offer personal support.","Trust; AI agents; Values; Value Similarity; Social Situations","en","abstract","","","","","","The author thanks Myrthe L. Tielman and Catholijn M. Jonker for their supervision and support.","","","","","Interactive Intelligence","","",""
"uuid:6e7719a8-0a70-47ec-88cf-8fef9e2d5628","http://resolver.tudelft.nl/uuid:6e7719a8-0a70-47ec-88cf-8fef9e2d5628","Modelling Gaia: towards an Actor-Network modelling framework in archaeology","Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-11","","","Water Resources","","",""
"uuid:94c087f8-790d-4556-8d2e-ad755a8ca616","http://resolver.tudelft.nl/uuid:94c087f8-790d-4556-8d2e-ad755a8ca616","How Co-design Processes Improve Public Space Resilience:: Lessons From Two Urban Parks in the Atacama Desert","Gaete Cruz, M. (TU Delft Urban Development Management); Ersoy, A. (TU Delft Urban Development Management); Czischke, D.K. (TU Delft Housing Management); van Bueren, Ellen (TU Delft Management in the Built Environment)","","2021","With the social, ecological and sanitary pressures on urban settlements
and the public sector being unable to successfully provide such answers
alone, co-design can play a crucial role towards urban transformations
and resilient public spaces. We understand co-design as a process in
which institutional networks of public, private, citizens, non-public
organizations and partnerships collaborate in different levels within
design steps. We understand public spaces as socio-ecological systems
that unfold spatially and functionally. This study posits that co-design can
improve the evolutionary resilience of the public space projects when
the involved institutional networks bring socio-ecological knowledge
and values to such processes of design. The question remains how does
co-design actually influences the socio-ecological resilience of public
spaces? And how can we analyze such co-designed outcomes? This article
proposes a framework to analyze the resilience of co-designed public
spaces, and studies two urban parks in the Atacama Desert. Findings
suggests that a socio-ecological resilience approach to such co-design
processes improves the local context-specificity and suitability of the
designs emphasizing the transformative capacity of such collective urban
spaces. And while doing so, it may improve their legitimacy and set the
basis for the co-operation of such projects. The framework may be useful
for future conceptualizations of urban co-design, as well as to plan such
collaborative urban processes in practice. Although the cases are framed
in Latin America; the findings may be useful elsewhere.","Culture; Context; Public Space; Design; Craftmanship; Symbolic ornamentation; West 8; Framework; Affordance; Meaning in design","en","abstract","","","","","","","","","","Management in the Built Environment","Urban Development Management","","",""
"uuid:68ef1b05-edb2-425c-a540-10a84621301f","http://resolver.tudelft.nl/uuid:68ef1b05-edb2-425c-a540-10a84621301f","The effect of the GIA feedback loop on the evolution of the Antarctic Ice sheet over the last glacial cycle using a coupled 3D GIA – Ice Dynamic model","van Calcar, C.J. (TU Delft Astrodynamics & Space Missions; Universiteit Utrecht); de Boer, Bas (Vrije Universiteit Amsterdam); Blank, B. (TU Delft Astrodynamics & Space Missions); van de Wal, Roderik S W (Universiteit Utrecht); van der Wal, W. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions)","","2021","The Earth’s surface and interior deform due to a changing load of the Antarctic Ice Sheet (AIS) during the last glacial cycle, called Glacial Isostatic Adjustment (GIA). This deformation changes the surface height of the ice sheet and indirectly the groundling line position. These changes in surface height and grounding line position influence the evolution of the AIS and consequently, again the load on the Earth’s surface. As a result, GIA operates as a negative feedback loop and could stabilize the evolution of the AIS. This feedback maybe particularly relevant for relatively low viscosities of the mantle in West Antarctica which lead to a relatively fast response time of the bedrock due to changes in the West Antarctic Ice Sheet loading. Most studies capture this process by ignoring lateral variations in the viscosity of the mantle and the stabilizing GIA feedback loop. Here we present a new method to couple an ice sheet model to a GIA model at a variable timestep in the order of a thousand years. Several experiments have been done using different radial and lateral varying rheologies for simulations of the last glacial cycle. It is shown that the effect of including lateral variations and accounting for the stabilizing GIA feedback is up to 80 kilometers for the grounding line position and 400 meters for the ice thickness. The largest differences are observed close to the grounding line of the Ronne ice shelf and at several locations in East Antarctica. The total ice volume of the AIS increases by 0.5 percent over 5000 years when including the 3D GIA feedback loops in the coupled model. These results quantify the local importance of including GIA feedback effects in ice dynamic models when simulating the Antarctic Ice Sheet evolution over the full glacial cycle.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:ffb4bd76-3be4-47c7-b22b-1be10ea9b593","http://resolver.tudelft.nl/uuid:ffb4bd76-3be4-47c7-b22b-1be10ea9b593","LAB 2 /Educating for the Built Environment: Lifelong and “lifewide” learning in arts, architecture, and engineering","Cavallo, R. (TU Delft Theory, Territories & Transitions); Roth Čerina, M. (University of Zagreb); de Walsche, J. (Universiteit Antwerpen); Hadler, F. (University of Arts, Berlin)","","2021","","","en","abstract","","","","","","Part of the online conference report: Common Ground: Making the Renovation Wave a Cultural Project","","","","","Theory, Territories & Transitions","","",""
"uuid:76950d36-f46e-4ab6-8775-ef031b138ea5","http://resolver.tudelft.nl/uuid:76950d36-f46e-4ab6-8775-ef031b138ea5","Radio wave treatment of soil for pathogen inactivation","Sturm, G.S.J. (TU Delft Energy Technology); van der Wurff, A. (Groen Agro Control); Linnenbank, S. (Koppert Machines B.V.); Bonnet, J. (Stichting Control in Food & Flowers); Koppert, A. (Koppert Machines B.V.)","","2021","","","en","abstract","","","","","","","","","","","Energy Technology","","",""
"uuid:11d239df-af9d-469c-8e44-b396ea56fc2d","http://resolver.tudelft.nl/uuid:11d239df-af9d-469c-8e44-b396ea56fc2d","Experimental and numerical study of the time dependent behavior of fracture propagation in salt rock","Escanellas, Andreu (Universitat Politecnica de Catalunya); Cámara, Eduardo (Universitat Politecnica de Catalunya); Liaudat, J. (TU Delft Geo-engineering); Carol, Ignacio (Universitat Politecnica de Catalunya)","","2021","In underground salt and potash mines, such as the ones in the region of Bages in central Catalonia, long-term deformations and stability of the mine tunnels are strongly influenced by the viscous (creep) behavior of saline rock. Tunnel excavation causes deviatoric stresses which in turn trigger creep strain in the salt rock. It has been often considered that the main consequences of creep are time-dependent convergences with potential consequences for the serviceability of the mine. However, creep deformations may be accompanied by stress redistribution, and potentially also by cracking and fracture, especially if rock exhibits preexisting discontinuities and/or layers separated by weaker contacts. In this way, tunnel crosssections that are perfectly stable after excavation, with time may not only deform, but also approach failure collapse. Traditionally, salt rock has been mainly characterized with regard to the creep behavior, while strength issues have been addressed independently in ways similar to other rock materials, via strength criteria such as Mohr-Coulomb, etc. However, there seem to be very few studies considering the fracture mechanics of salt rock. In this paper, the on-going experimental and numerical research along this line at ETSECCPBUPC is described. This includes standard creep tests as well as mode I fracture Wedge Splitting Tests (WST). WSTs have been performed at different loading rates with the purpose of assessing the time dependency of parameters such as the tensile strength and the specific apparent fracture energy. Preliminary test results show that as the loading rate is increased, the tensile strength seems higher but the apparent fracture decreases. Numerical calculations include finite element simulations of the WST, as it has been done before for other rock types by some of the authors1. Continuum elements with visco-elastic behavior were used to represent the salt rock material, while the fracture path was represented via preinserted zero-thickness interface elements. As a first attempt, the constitutive model used for the interface elements was a (time-independent) elasto-plasticity framework with fracture energybased evolution laws 2 . The preliminary numerical simulations qualitatively reproduce the experimental results, however, it seems that in order to quantitatively fit the experimental results, a new time-dependent constitutive model for the interface elements would be required in which fracture properties and evolution should interact with creep and time-dependent behavior.","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:6bb5eda2-b584-4102-b9ac-18cc0a96cb83","http://resolver.tudelft.nl/uuid:6bb5eda2-b584-4102-b9ac-18cc0a96cb83","Exploring revenue-driven wind turbine design","Mehta, M.K. (TU Delft Wind Energy); von Terzi, D.A. (TU Delft Wind Energy); Zaaijer, M B (TU Delft Wind Energy)","","2021","Traditionally, wind turbine and wind farm designs have been optimized to minimize the cost of energy. Such a design would make sense when bidding in price-based auctions. However, in a future with a high share of renewables and zero subsidies, the wind farm developer could be completely exposed to the volatility of market prices, where the price paid per kWh of energy would not be a constant anymore. The developer might then have to maximize the revenue earned by participating in di_erent energy, capacity, or ancillary services markets. In such a scenario, a turbine designed for maximizing its market value could be more pro_table for the developer compared to a turbine designed for minimizing the Levelized Cost of Electricity (LCoE). This study is in line with this paradigm shift in the _eld of turbine and farm design. The goal is to optimize the de- sign for a new set of objective functions and constraints, and analyze the impact of these new designs on the system as a whole. The power density of the turbine is optimized to maximize the Internal Rate of Return (IRR) and is compared to the turbine design optimized for LCoE. A multivariate model is developed to derive the spot price from the existing nationwide wind power and demand forecast. For the future years, the forecasts are scaled up w.r.t the increase in installed wind turbine capacity and demand derived from trends/government targets. Various scenarios are simulated wherein the installed wind turbine capacity and demand are varied. A gradient-free optimization is performed by using the rotor diameter as a design variable while keeping the machine rating constant. Using IRR as an objective function results in larger rotor sizes enabling the turbine to produce a higher power at lower wind speeds, corresponding to times with higher spot prices. The result of a scenario (Target) where the installed wind turbine capacity follows government targets and demand is extrapolated linearly, is shown in Figure 1a. Here, the power density of a 5 MW baseline turbine is optimized for IRR, where the revenue from the Dutch day-ahead market is considered along with the turbine costs. Results for a single (onshore) turbine will be compared with a similar IRR optimization of power density of a turbine in a sample o_shore wind farm. At a wind farm level, the e_ects of power density variations on the farm layout, wake losses, ca- bling costs, etc. are also included. Moreover, insights into the consequences of optimizing the turbines on 'system-friendliness' are provided. Figure 1b illustrates a comparison between the farm capacity factor and farm power ramps. It is observable that while the capacity factor of the farm with a revenue-driven turbine is higher, the power ramps are steeper as well. A system-level trade-o_ is apparent as higher capacity factors ensure a better supply of demand at lower wind speeds while higher ramps need further compensation. This shows how moving beyond LCoE, by only considering energy markets, might not necessarily produce the most system-friendly turbines. To avoid negative implications, this study emphasizes the need to examine the consequences of selecting a revenue-based objective function on the system as a whole.","wind turbine optimization; Wind Turbine","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:e26c8d7b-1128-41a1-a566-b54b4b72d4b6","http://resolver.tudelft.nl/uuid:e26c8d7b-1128-41a1-a566-b54b4b72d4b6","Decarbonising future heating systems: trade-offs between water use and CO2 emissions","Kaandorp, C. (TU Delft Water Resources); van de Giesen, N.C. (TU Delft Water Resources); Abraham, E. (TU Delft Water Resources)","","2021","Sustainable energy systems can only be achieved when reducing both carbon emissions and water use for energy generation. Water-energy nexus studies are therefore crucial for supporting environmental policy oriented towards the mobilisation of resources in an optimally integrated way. Decarbonizing heating infrastructures is an important part of achieving low-carbon energy systems because they globally account for 50% of the final energy consumption and 40% of the carbon dioxide (CO2) emissions. In our study, we quantitatively assess the changing water usage of the energy sector due to the integration of low carbon heating infrastructures. Multiple future energy mix scenarios were assessed by building a multi-scale energy and water use model that quantifies the direct and virtual water footprint of space heating and hot water use in households, services and industry. In this presentation we show an analysis on the water use of heating pathways towards the year 2050 for the Netherlands and its capital, the city of Amsterdam. Additionally, we present preliminary results from our research about the trade-offs between carbon emission reductions, insulation measures and energy reliability in neighbourhoods in Amsterdam.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:cfb36a11-6c13-4692-a096-d6e5d98d406e","http://resolver.tudelft.nl/uuid:cfb36a11-6c13-4692-a096-d6e5d98d406e","Supporting co-development phase of Nature Based Solution by combined use of Earth Observation and modeling","Alfieri, S.M. (TU Delft Optical and Laser Remote Sensing); Foroughnia, Fatemeh (TU Delft Geo-engineering); Pulvirulenti, Beatrice (University of Bologna); Lindenbergh, R.C. (TU Delft Optical and Laser Remote Sensing); Menenti, M. (TU Delft Optical and Laser Remote Sensing)","","2021","A protected natural area in the Emilia Romagna region, Northern Italy is threatened by hydro-meteorological hazards, particularly sea storms. In the last 50 years the northern part of the Bellocchio Park (Sacca Bellocchio II Nature Reserve, Site code EUAPP0072 - Ferrara, Italy) was interested by an intensive urbanization (Lido di Spina) with the realization of infrastructures, e.g. roads and residential settlements. This land use change led to the construction of embankments and to the conversion of wetlands. These modifications, in combination to even more frequent storm surge events increased coastal erosion. In addition, inland flooding caused by storm surges acts with the reduction of the lagoon and the increase of soil salinity. As an example, the last event occurred in December 2020 eroded a large portion of the Bellocchio beach.
Co-design, co-development and deployment of NBS solutions to reduce storm surge risk in the Bellocchio Park is one of the objectives of the H2020 project OPEn-air laboRAtories for Nature baseD solUtions to Manage environmental risks (OPERANDUM). BellocchioBellochio park is in fact one of the 10 Open Air Laboratories (OAL) where the evidence of mitigation of hydro-meteorological risk by NBS will be demonstrated by the combination of different models, approaches and data.
During the co-design process in the Bellocchio park, potential deployment locations of sand dunes have been identified in collaboration with local authorities devoted to the management of the natural area and to the coast defense (CB and ARSTePC-RER) and an environmental engineering consultant assisting Arpae (IRIS sas). Field visits were devoted to the analysis of the environmental features, strengths and weaknesses of candidate sites.
This work aims to explore the usefulness of the combined use of multisource remote sensing and modeling in decision making during the co-design process of a NBS. The impacts of the most intense extreme storm surge events in the last 30 years have been documented by delineating flooded areas along the coast using Synthetic Aperture Radar and Multispectral image data. Coastal erosion has been also described by means of change detection analysis and very high resolution multispectral EO data. This screening has given a picture of areas at the risk, i.e. the area most likely to be affected by storm-surge events. Auxiliary data like Digital Terrain Models has been assimilated in a dedicated model to produce flood maps under different scenarios, i.e. different locations and size of NBS and different intensities of storm surge.
The integrated analysis was helpful in defining the priority sites, among the ones defined by the stakeholders and engineers, in term of effectiveness for storm surge risk reduction.","","en","abstract","","","","","","","","","","","Optical and Laser Remote Sensing","","",""
"uuid:a5892b60-b43c-4173-9365-6b4670734301","http://resolver.tudelft.nl/uuid:a5892b60-b43c-4173-9365-6b4670734301","Summarising a Framework for the Certification of Reliable Autonomous Systems","Fisher, Michael (University of Liverpool); Schlingloff, Bernd-Holger (Humboldt University; Fraunhofer FOKUS); Mascardi, Viviana (University of Genova); Winikoff, M.D. (Victoria University of Wellington); Rozier, Kristin Yvonne (Iowa State University); Yorke-Smith, N. (TU Delft Algorithmics)","","2021","This extended abstract summarises the contributions from the journal
article Fisher et al.","Autonomous Systems; Reliability; Verification","en","abstract","","","","","","","","","","","Algorithmics","","",""
"uuid:64559f52-6ae2-4a54-aaf5-b0ac81e750fb","http://resolver.tudelft.nl/uuid:64559f52-6ae2-4a54-aaf5-b0ac81e750fb","Efficient long-term one-dimensional morphodynamic modelling in alluvial rivers using simplified models – theory and validation","Barneveld, Hermjan (Wageningen University & Research; HKV Consultant); Hoitink, Ton (Wageningen University & Research); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chavarrias, V. (Deltares)","","2021","","river morphology; numerical modelling; analytical approach","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:943dc921-23ae-4f00-a9af-13dbfc221d70","http://resolver.tudelft.nl/uuid:943dc921-23ae-4f00-a9af-13dbfc221d70","A satellite-image-based method to overcome data scarcity for river morphodynamic modelling","Omer, Amgad (Deltares); Yossef, Mohamed (Deltares); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Yildiz, B. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares; Mugla Sitki Kocman University)","","2021","","Morphological modelling; data scarcity; Bangladesh","en","abstract","","","","","","Accepted Author Manuscript","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:c68d5e98-6b32-42aa-b376-59f5dee3a6b6","http://resolver.tudelft.nl/uuid:c68d5e98-6b32-42aa-b376-59f5dee3a6b6","Damping of ship-induced primary waves in groyne fields","Pasman, R. (TU Delft Hydraulic Structures and Flood Risk); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Bricker, J.D. (TU Delft Hydraulic Structures and Flood Risk); van der Hout, A.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Collas, Frank (Radboud Universiteit Nijmegen); Huthoff, Freek (HKV Consultants; University of Twente)","","2021","","ship-induced waves; ecological preservation; groyne field","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Hydraulic Structures and Flood Risk","","",""
"uuid:6e84c0b2-4886-4e91-8317-ced18fa962a7","http://resolver.tudelft.nl/uuid:6e84c0b2-4886-4e91-8317-ced18fa962a7","Development of Dorsal Root Ganglion (DRG) Multichannel Stimulator Prototype for use in Early Clinical Trials","Kolovou Kouri, K. (TU Delft Bio-Electronics); Soloukey, Sadaf (Erasmus MC); Harhangi, Biswadjiet (Erasmus MC); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics)","","2021","Spinal Cord Injury (SCI) is characterized by a disruption of the spinal pathways connecting the brain to the rest of the body. This can result in an impairment or complete loss of sensory and/or motor functions, depending on the level and severity of the injury. The most common approach of attempting motor recovery using neuromodulation has been through epidural spinal cord electrical stimulation (eSCS), with or without rehabilitation and robotic assistance¹ , ². Dorsal Root Ganglion (DRG) stimulation is a relatively new neuromodulation treatment, which has already been established as a safe and effective treatment for chronic pain. However, its application for motor recovery after SCI has remained unexplored territory. A recent study by Soloukey et al.³ showed the first promising results using L4-level DRG-stimulation to evoke strong and reproducible motor responses in the upper leg muscles of patients with motor complete SCI. The current work presents the development of a prototype stimulator intended for use in early clinical trials for the purpose of further exploring the effects of multi-level DRG-stimulation on motor recovery after SCI. The prototype stimulator is created using commercially available components, focussing primarily on the safety considerations for the use of the prototype in a clinical research environment. The prototype allows for access to multiple leads in parallel to facilitate faster, sequential stimulation, catering for a maximum of 16 leads at once. The final system is equipped with a microcontroller for the programming of the stimulation parameters, a Bluetooth module for the communication with external components (Graphical User Interface (GUI) on a local PC) and tailored connections to the stimulating DRG-leads. The safety and well-being of the patient is set as a first priority, leading to a tailored design and development of the stimulator accordingly. Parameters like the patient's comfort when connected to the device, the safety of the patient and the medical personnel with regards to powering the device through the mains, and protection from any current or DC voltage leakage, are discussed. The prototype is currently undergoing safety evaluation and the complete system design together with these results will be presented during the conference.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:9bf7d34b-ad31-4378-b25a-a1c339e5d1a9","http://resolver.tudelft.nl/uuid:9bf7d34b-ad31-4378-b25a-a1c339e5d1a9","The origin of two-step yielding in natural mud: wall slip or structural reorganization?","Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chassagne, C. (TU Delft Environmental Fluid Mechanics)","","2021","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:e71a4b04-b59c-4e75-a789-7c5969462c36","http://resolver.tudelft.nl/uuid:e71a4b04-b59c-4e75-a789-7c5969462c36","Spatial variability in the yield stress of mud at Port of Hamburg, Germany","Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chassagne, C. (TU Delft Environmental Fluid Mechanics)","","2021","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:643c9ad0-bcde-49ef-8c06-f2ed976a73d8","http://resolver.tudelft.nl/uuid:643c9ad0-bcde-49ef-8c06-f2ed976a73d8","Detailed modelling and monitoring of WID as an efficient harbor siltation maintenance strategy","de Wit, Lynyrd (Deltares); Cronin, Katherine (Deltares); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); van Kessel, Thijs (Deltares)","","2021","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:7be8f9ea-56be-48bc-9dab-5ed50b25136c","http://resolver.tudelft.nl/uuid:7be8f9ea-56be-48bc-9dab-5ed50b25136c","The role of updrafts in the scaling of extreme precipitation in midlatitudes","Bentvelsen, F.P. (Student TU Delft); Lenderink, G. (TU Delft Atmospheric Remote Sensing; Royal Netherlands Meteorological Institute (KNMI)); Siebesma, A.P. (TU Delft Atmospheric Remote Sensing; Royal Netherlands Meteorological Institute (KNMI))","","2021","We investigate the hypothesis that invigoration of convective updrafts under warming conditions contributes to the stronger than Clausius-Clapeyron (CC) scaling. Focus is on a mid-latitude case of extreme precipitation, based on idealised forcing conditions derived for the Netherlands, with strong surface forcing as well as strong forcing from large-scale rising motion associated with the passage of a synoptic scale low pressure or frontal system. Various Large Eddy Simulations (LES) of this composite case have been performed on a 192x192 km domain. By systematically perturbing the atmospheric temperature profile, a large response of cloud dynamics to warming with larger and more vigorous cloud structures in the warmer runs has been found.*
Here, we study these cloud dynamics further by investigating the vertical wind velocity in the cloud (cores). Updrafts play a key role in rain formation by transporting moisture upward in the clouds. We will demonstrate how the distributions of these vertical velocities near the surface and at different levels in the clouds respond to warming in this mid-latitude setting and how they relate to cloud properties as cell size and buoyancy.
We argue that innovative business models—like sustainable product-service system (SPSS)—have the potential to ease the adoption process by overcoming many of its constraints (e.g. unaffordable upfront costs, lack of adequate servicing). These business models, unlike traditional linear approaches of technology transfer, have to take into account a broader network of stakeholders. In this way, the technology becomes an agent of interaction between involved parties. It turns into a dynamic element, connected to other products and well-developed services, that caters multiple farming needs. In our paper, we discuss enablers and barriers for the implementation of an SPSS in smallholder contexts under different scenarios. We analyze them based on evidence from Nepali and Indonesian smallholder communities where a novel hydro-powered pumping technology, known commercially as the Barsha pump, has been deployed. The insights gathered reveal many leverage points to create synergies between farmers, entrepreneurs, financial institutions, non-profit organizations and governmental agencies. They also denote the persistent challenges in the required shift of mindset for such an innovative system to come into full operation.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:dc550299-2bbf-4a44-82d1-11808fc7290b","http://resolver.tudelft.nl/uuid:dc550299-2bbf-4a44-82d1-11808fc7290b","Determining OBS clock drift using ambient seismic noise","Naranjo, D. (TU Delft Applied Geophysics and Petrophysics; King Abdullah University of Science and Technology; Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences); Parisi, Laura (King Abdullah University of Science and Technology); Jousset, Philippe (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences); Weemstra, C. (TU Delft Applied Geophysics and Petrophysics; Royal Netherlands Meteorological Institute (KNMI)); Jónsson, Sigurjón (King Abdullah University of Science and Technology)","","2021","Accurate timing of seismic records is essential for almost all applications in seismology. Wrong timing of the waveforms may result in incorrect Earth models and/or inaccurate earthquake locations. As such, it may render interpretations of underground processes incorrect. Ocean bottom seismometers (OBSs) experience clock drifts due to their inability to synchronize with a GNSS signal (with the correct reference time), since electromagnetic signals are unable to propagate efficiently in water. As OBSs generally operate in relatively stable ambient temperature, the timing deviation is usually assumed to be linear. Therefore, the time corrections can be estimated through GPS synchronization before deployment and after recovery of the instrument. However, if the instrument has run out of power prior to recovery (i.e., due to the battery being dead at the time of recovery), the timing error at the end of the deployment cannot be determined. In addition, the drift may not be linear, e.g., due to rapid temperature drop while the OBS sinks to the seabed. Here we present an algorithm that recovers the linear clock drift, as well as a potential timing error at the onset.
The algorithm presented in this study exploits seismic interferometry (SI). Specifically, time-lapse (averaged) cross-correlations of ambient seismic noise are computed. As such, virtual-source responses, which are generally dominated by the recorded surface waves, are retrieved. These interferometric responses generate two virtual sources: a causal wave (arriving at a positive time) and an acausal wave (arriving at a negative time). Under favorable conditions, both interferometric responses approach the surface-wave part of the medium's Green's function. Therefore, it is possible to calculate the clock drift for each station by exploiting the time-symmetry between the causal and acausal waves. For this purpose, the clock drift is calculated by measuring the differential arrival times of the causal and acausal waves for a large number of receiver-receiver pairs and computing the drift by carrying-out a least-squares inversion. The methodology described is applied to time-lapse cross-correlations of ambient seismic noise recorded on and around the Reykjanes peninsula, SW Iceland. The stations used for the analysis were deployed in the context of IMAGE (Integrated Methods for Advanced Geothermal Exploration) and consisted of 30 on-land stations and 24 ocean bottom seismometers (OBSs). The seismic activity was recorded from spring 2014 until August 2015 on an area of around 100 km in diameter (from the tip of the Reykjanes peninsula).","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:614e875e-2355-4f19-ae08-85f0024f8a44","http://resolver.tudelft.nl/uuid:614e875e-2355-4f19-ae08-85f0024f8a44","Q methodology in low-resource settings: Challenges and best practices","Intriago Zambrano, J.C. (TU Delft Water Resources); Diehl, J.C. (TU Delft Design for Sustainability); Ertsen, M.W. (TU Delft Water Resources)","","2021","Reduction of poverty is a main goal in the global development agenda. The most extreme forms of poverty are mainly rooted in the Global South, and even more engrained in its rurality. Such poverty is not only characterized by infimum incomes, but also by the lack of access to many resources and services: health, sanitation, drinking water, education, etc. Eradication of deep poverty therefore demands a holistic understanding of its causes, as well as the wicked interaction of its many variables. International definitions of (deep) poverty, however, keep resorting to income thresholds (e.g. World Bank’s International Poverty Line) to measure it. In consequence, such definitions may overshadow underlying context-dependent complexities: gender dimensions, urban/rural divide, societal power relationships, local economic dynamics.
Q methodology is a potentially powerful tool to understand better the different nuances of poverty, thus to enable a more effective tackling of its roots. First, as a participatory method, it offers voices to grassroots participants to express their own priorities and concerns. Second, it encompasses rich qualitative data that go beyond oversimplified quantitative thresholds and analyses. Third, as a reductionist technique, it condenses (virtually) infinite positions into clearly identifiable poverty discourses.
At the same time, methodological deployment of Q methodology in low-resource settings, and particularly in rural areas, poses several (underreported) challenges worth to be considered and discussed. These challenges may be exacerbated in light of big shocks, like the current COVID-19 pandemic. Whether related to the concourse development, sorting grid design, P-set sampling, administration, data recording or validation, researchers may encounter a number of concerns/restrictions.
In our work, we analyze these challenges along with proposed corresponding best practices. This analysis is the result of both literature review and first-hand Q methodology administration with smallholders in Nepal, Indonesia and Malawi. Best practices notwithstanding, we advocate for the empowerment of local researchers regarding this technique that remains ‘property’ of the western world. By democratizing the knowledge on its application, we expect local stakeholders to explore and prioritize their needs—and its potential solutions—in a more precise manner.","low resource settings; poverty; methodological challenges; smallholder farming","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-17","","","Water Resources","","",""
"uuid:c5f11da8-6d13-4f8c-8468-816e1d8b5429","http://resolver.tudelft.nl/uuid:c5f11da8-6d13-4f8c-8468-816e1d8b5429","Adaptive Data-Driven Persuasive Communication for a Conversational Agent to Support Behavior Change","Albers, N. (TU Delft Interactive Intelligence); Brinkman, W.P. (TU Delft Interactive Intelligence); Neerincx, M.A. (TU Delft Interactive Intelligence)","","2021","A human therapist continuously adapts how they persuade a client to adhere to a behavior change intervention based on theoretical expertise, past experience with the client as well as other clients, and the client's current situation. We aim at incorporating these elements into the persuasive communication of a conversational agent that acts as a virtual coach for smoking cessation and physical activity increase. The focus thereby is on investigating how three coaching elements, goal-setting, data-monitoring and the assignment of activities, can be designed to enhance treatment adherence. A first experiment is currently finished to 1) get user input for the interaction design based on interaction scenarios, 2) gather data for and test a reinforcement learning-approach to persuading people to do small preparatory activities for smoking cessation and increasing physical activity, and 3) gain insights into the acceptance and perceived motivational impact of the virtual coach used to persuade people.","Conversational agent; Virtual coach; Persuasion; Reinforcement learning; Personalization; Behavior change; Smoking cessation","en","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:3c7edd66-cb2f-40b9-8d76-6239abfcaf51","http://resolver.tudelft.nl/uuid:3c7edd66-cb2f-40b9-8d76-6239abfcaf51","Design-to-Robotic-Production for Circular Approaches in Architecture: ACM Demo","Bier, H.H. (TU Delft History, Form & Aesthetics); Jani, K.; Jain, S.P. (Student TU Delft); Latour, M.T.C. (TU Delft History, Form & Aesthetics); Avrămiea, E.C. (TU Delft History, Form & Aesthetics)","","2021","Design-to-Robotic-Production (D2RP) approaches developed in the Robotic Building lab at Technical University (TU) Delft link computational design to robotic production. They facilitate the development of process, energy, and material efficient approaches in architecture. When combined with circular wood approaches, they help reduce the ecological footprint left behind by construction processes, which is explored here as a workshop in collaboration with Amsterdam University of Applied Sciences (AUAS) as part of a project funded by the Dutch Research Council. The workshop introduced students to subtractive D2RP that was implemented on structurally optimized curvilinear components milled from circular i.e., reused wood.","","en","abstract","","","","","","","","","","","History, Form & Aesthetics","","",""
"uuid:dd3855c1-4365-41c4-b885-829b4aa90542","http://resolver.tudelft.nl/uuid:dd3855c1-4365-41c4-b885-829b4aa90542","Fundamental Challenges for Laser Satellite Communications and Quantum Key Distribution","Saathof, R. (TU Delft Space Systems Egineering); Speretta, S. (TU Delft Space Systems Egineering); Guo, J. (TU Delft Space Systems Egineering); Kuiper, J.M. (TU Delft Space Systems Egineering); Gill, E.K.A. (TU Delft Space Systems Egineering)","","2021","Laser satellite communications provides an attractive application for optical communications. It provides more bandwidth with improved security at potentially a lower cost due to reduced size weight and power (SWAP) and reduced license cost compared to radio frequencies (RF) communications. These advantages have been recognized for years and lead to the successful European data relay service (EDRS) [1]. This service provides the proof that optical communications can be used as a reliable means of satellite communications. In addition, the inherently save quantum key distribution (QKD) technology is demonstrated in a satellite to ground link in [2]...","","en","abstract","","","","","","","","","","","Space Systems Egineering","","",""
"uuid:db3b702f-7963-4992-ae41-42066c26a17c","http://resolver.tudelft.nl/uuid:db3b702f-7963-4992-ae41-42066c26a17c","Challenges in the sampling and characterisation of mining residues for CRMs recovery","Guatame-Garcia, Adriana (TU Delft Resource Engineering); Buxton, M.W.N. (TU Delft Resource Engineering); Kasmaee, Sara (University of Bologna); Tinti, Francesco (University of Bologna); Horta Arduin, Rachel (Université Bordeaux Montaigne); Mas Fons, Aina (Université de Bordeaux); Bodenan, Francoise (Bureau de Recherches Géologiques et Minières (BRGM)); Schick, Joachim (Innovation Center for Extractive Metallurgy, Orano Mining, Bessines-sur-Gartempe)","","2021","The recent Circular Economy Action Plan for Europe1 considers mine waste a secondary source of minerals. These deposits contain potentially economic concentrations of Critical Raw Materials (CRMs), such as Al, Li, Co and REE, which are strategic for the global economy and energy transition. However, there are significant knowledge and technological gaps that hinder their successful recovery. The INCO-Piles 2020 project2 is currently working on the recapitulation, establishment and development of innovative technologies for the sustainable extraction of CRMs from the residuals of mining activities, focusing on Regional Innovation Scheme (RIS) strategic areas. The project includes the definition of potential applications, best practices, and the promotion of technology transfer through round tables that count with international experts' participation.The first Round Table, a hybrid event held in December 2020 with 73 experts from 23 countries, addressed the challenges in recovering CRMs from tailings. The discussions were based on three topics: (1) challenges in sampling and characterisation from mining residue, (2) extraction and processing challenges, and (3) economic and environmental challenges. Regarding the first topic, one of the most significant issues is the inherent heterogeneity of mine waste deposits, which is a product of the mine processing and deposition methods, and the post-depositional weathering reactions. The lack of historical data, particularly for old deposits, hampers the understanding of such processes. A second challenge concerns the specific type of information required for assessing the CRMs potential. Representative geochemical and mineralogical data must be collected and interpreted at different scales (i.e., from individual minerals to tens of meters tall waste rock piles and tailings). The collection of representative samples faces issues related to the accessibility to the mine waste sites, the coverage and the sample contamination (i.e., material mixing) related to sample recovery methods. The scalability can be addressed by a combination of laboratory analyses, in-the-field surveys and remote sensing techniques. Current innovations in the combination of modern analytical instruments for geochemistry and mineralogy (e.g., pXRF, LIBS and portable infrared spectrometers) and the implementation of machine learning and artificial intelligence techniques will contribute to closing the knowledge and technology gaps.Lastly, the discussions included the potential hazards faced during the characterisation and re-intervention of old-sites. Well-known mine wastes issues related to human health, environment and license to operate that can hinder a characterisation campaign must be properly considered before the commencement of a CRMs recovery project. The participants also identified transversal challenges for the three discussion topics, such as the need for regulation and professionals with an appropriate background.All the insights discussed during this First Round Table will serve as a baseline for defining the best practices for characterisation and sampling of CRMs in mine wastes and contributing to increasing the sustainability in the supply of mineral resources and improving old mining sites' environmental quality. 1 EU Circular Economy Action Plan https://ec.europa.eu/environment/circular-economy/ 2 INCO-Piles is a two-year project funded by EIT RawMaterials. More information: https://site.unibo.it/inco-piles-2020/en","","en","abstract","","","","","","","","","","","Resource Engineering","","",""
"uuid:80ac84e0-a352-477f-a593-fcaa58ce3c7e","http://resolver.tudelft.nl/uuid:80ac84e0-a352-477f-a593-fcaa58ce3c7e","The role of citizen science as a tool of public information in water quality management in the Brantas catchment, Indonesia","Pramana, K.E.R. (TU Delft Water Resources); Houser, R.S. (TU Delft Water Resources); Rini, Daru (Ecoton); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:a97ed10e-403e-44b6-ad13-1fc982febf39","http://resolver.tudelft.nl/uuid:a97ed10e-403e-44b6-ad13-1fc982febf39","Effectiveness of electromagnetic and electro-osmosis methods for the treatment of rising damp","Julie, Desarnaud (Belgian Building Research Institute; Royal Institute for Cultural Heritage); Vanhellemont, Yves (Belgian Building Research Institute); Lubelli, B. (TU Delft Heritage & Technology); de Bouw, Michael (Belgian Building Research Institute)","","2021","Rising damp is a very common phenomenon and one of the most important threats for historical buildings. In this paper two non-invasive systems are studied, the first one is based on the interaction of pulsed electromagnetic waves with the porous materials and the second one is based on the active electro-osmosis principle where the natural difference in electric potential between the walls and the ground is annihilated. Within the light of the debates on the real efficiency against rising damp of such techniques in preservation of historical monuments the last 5 years, the development of such an objective test method and the outcomes of the two tested systems provided important findings for the heritage community.","rising damp; electo-osmosis; eletromagnetic techniques","en","abstract","","","","","","","","","","","Heritage & Technology","","",""
"uuid:ce658e0f-6e05-423e-becb-48c21acdf839","http://resolver.tudelft.nl/uuid:ce658e0f-6e05-423e-becb-48c21acdf839","Butterflies, Elephants and Gravity to Model Human-Earth Interactions","Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:6d0d71cf-fc36-4503-8415-ce7ca53ae281","http://resolver.tudelft.nl/uuid:6d0d71cf-fc36-4503-8415-ce7ca53ae281","Development of climate functions for aircraft design","Deck, K.T. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (TU Delft Aircraft Noise and Climate Effects); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects); Vos, Roelof (TU Delft Flight Performance and Propulsion); Proesmans, P. (TU Delft Flight Performance and Propulsion); Linke, Florian (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Kaushik Radhakrishnan, Kaushik (Student TU Delft); Niklaβ, Malte (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2021","Aviation ensures mobility for both passengers and goods. It is important as a transport sector for connections on and between continents. Nevertheless, aviation also contributes to anthropogenic climate change. The e_ects are usually divided in CO2 and non-CO2 e_ects and therefore not only CO2 emissions but also other emissions (e.g., NOx, water vapour or soot) and contrails are covered. To reduce the e_ects of aviation's climate impact, several mitigation options are applied. One approach are climate change functions, which will be addressed here. The concept of climate change functions was used in previous projects, e.g. REACT4C,WeCare, ATM4E. The goal of these functions was to optimize the aircraft routes regarding the calculated climate impact. Climate change functions measure the climate impact per unit emission for a speci_c day, which considers the current meteorological conditions. Climate change functions were previously used to optimize the aircraft routings. The concept should now be applied for the optimization of the aircraft design as well since the promising concept is currently missing for the application of aircraft design optimization. The climate functions for aircraft design will connect the aircraft design with the climate impact of various emission in order to be able to optimize the aircraft design. For the calculation of the functions, it is necessary to de_ne a speci_c application. This application results from a combination of aircraft design parameters. Aircraft design parameters can be for example ight altitude, climb rate, speed or range. Based on a resulting emission inventory, the temperature response can be calculated with the model \AirClim"". This model calculates with the input, _rst, the radiative forcing and based on that the temperature change. The _nal development step is the veri_cation of the climate functions.","","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:13257b94-1dd9-4dd6-8b99-a50f50bb094d","http://resolver.tudelft.nl/uuid:13257b94-1dd9-4dd6-8b99-a50f50bb094d","Analysis of water quality time series for improving the measurement strategy in the Brantas basin, Indonesia","Willard, T.S. (TU Delft Water Resources); Pramana, K.E.R. (TU Delft Water Resources); Pande, S. (TU Delft Water Resources); van Breukelen, B.M. (TU Delft Sanitary Engineering); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:0de2101d-41ec-4b70-b215-fae45833f060","http://resolver.tudelft.nl/uuid:0de2101d-41ec-4b70-b215-fae45833f060","Conceptualizing and implementing an agent-based model of an irrigation system","Lang, D. (TU Delft Water Resources); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-10-09","","","Water Resources","","",""
"uuid:20cb7ee7-6b1f-4540-a816-5ebe88f8ea36","http://resolver.tudelft.nl/uuid:20cb7ee7-6b1f-4540-a816-5ebe88f8ea36","Coproducing a water quality dashboard: Data communication for decision support in the Brantas River basin, Indonesia","Nooy, Christa (Makara); Houser, R.S. (TU Delft Water Resources); Pramana, K.E.R. (TU Delft Water Resources); Nugrahany, Astria (Perum Jasa Tirta 1); Rini, Daru (Ecoton); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:0a6853c3-2b92-4863-8375-a5e83fd38cba","http://resolver.tudelft.nl/uuid:0a6853c3-2b92-4863-8375-a5e83fd38cba","Structuring the water quality policy problem: Applying Q-methodology to explore perspectives in hydrology, government, and community","Houser, R.S. (TU Delft Water Resources); Pramana, K.E.R. (TU Delft Water Resources); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:61a0d62b-165a-4d6b-98d3-145aa8040557","http://resolver.tudelft.nl/uuid:61a0d62b-165a-4d6b-98d3-145aa8040557","Modelling Gaia: towards an Actor-Network modelling framework in archaeology","Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-10-09","","","Water Resources","","",""
"uuid:b61ba492-94e4-4af2-a8f6-fb6a4bcb91ae","http://resolver.tudelft.nl/uuid:b61ba492-94e4-4af2-a8f6-fb6a4bcb91ae","Putting Back Actuation in Pneumatically Actuated Soft Robots: modeling and backstepping control","Stölzle, Maximilian (TU Delft Learning & Autonomous Control); Della Santina, C. (TU Delft Learning & Autonomous Control)","","2021","","Soft Robotics; Nonlinear Control; Backstepping","en","abstract","","","","","","","","","","","Learning & Autonomous Control","","",""
"uuid:d608f671-8162-4d2d-9ab2-5133ae752344","http://resolver.tudelft.nl/uuid:d608f671-8162-4d2d-9ab2-5133ae752344","Culture and Context in Public Space Design: Symbolic ornamentation, local craftsmanship and public participation as a way to enable meaning and affordance","Hussain, A.M. (Student TU Delft); Cattoor, B. (TU Delft Landscape Architecture); Hooimeijer, F.L. (TU Delft Environmental Technology and Design)","","2021","Rapid urbanization and increasing globalization of urban development strategies are resulting in a lack of connection between people and places, and places and their context. Nevertheless, cultural embedding and sense of place have a direct impact on the quality of public space. The purpose of this research is to explore culture and context specific design strategies that enable the production of situated meaning , in turn augmenting the quality of public space. First, an extended framework for the evaluation of public space quality is presented, incorporating Gehl’s Twelve Quality Criteria, as well as aspects from Stobbelaar and Pedroli’s Landscape Identity Circle. Subsequently, three case studies by West 8, located in culturally and spatially diverse contexts and are evaluated against this framework. As a result from this analysis, symbolic ornamentation appears as West 8’s primary design strategy to embed these projects into their cultural and spatial contexts. With the term symbolic ornamentation, we refer to the abstraction of elements from the landscape – history, ecology or culture related – into design elements as a way to incorporate them within a design project. To this, the office deploys three specific strategies: analysis as a parallel and iterative process through the various phases of design, engagement of native collaborators and craftsmanship for local know-how and the facilitation of public participation for various purposes during the design process. The research concludes that cultural meaning is not independent of affordance and that functionality in a project can also evoke a sense of place through appropriate design strategies.","Culture; Context; Public Space; Design; Craftmanship; Symbolic ornamentation; West 8; Framework; Affordance; Meaning in design","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:a646ef7a-0c90-45e3-bada-cfbb8c529408","http://resolver.tudelft.nl/uuid:a646ef7a-0c90-45e3-bada-cfbb8c529408","Third wave of open data: Identifying and overcoming the barriers towards open data of public undertakings","Boone, Frida (Universiteit Utrecht); van Loenen, B. (TU Delft Urban Data Science); Musa, Anamarija (University of Zagreb)","","2021","The creation of open data has seen a series of waves in which every growing resources of data are becoming accessible to a growing number of users from a diversifying number of public entities. The European Commission anticipates this movement by setting a new scope to the re-use of Public Sector Information Directive. Instead of exclusively focussing on Public Sector Information (PSI), the new scope of its successor, the Open Data Directive (ODD), includes data from public undertakings as well. In order for public undertakings to comply with this future legislation, research into the current openness of public undertakings and the barriers to open data is key. This research presents three different levels of openness of data: (1) data is only open for the own organisation, (2) data is open for the internal organisation and trusted parties can use the data, and (3) open data for all. In this case three Dutch public undertakings and several Croatian public undertakings were studied. The data of the public undertakings researched were at different levels of openness and none of the public undertakings are at this moment ready to comply with the future rules when the ODD requirements become mandatory. Barriers that are associated with achieving a higher level of open data are related to institutional, financial, legal, and quality and technical aspects. Overcoming these barriers requires, among other things, highly motivated staff to provide open data.","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Urban Data Science","","",""
"uuid:90203412-cc40-437b-834c-c5b0ec0662ce","http://resolver.tudelft.nl/uuid:90203412-cc40-437b-834c-c5b0ec0662ce","Inclusive designs","Verschuure, G.A (TU Delft Landscape Architecture)","","2021","Abstract 366. This contribution deals with design workshops as part of public participatory processes in (sometimes) stiff processes on the rehabilitation of heritage landscapes.","","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:4d76905a-336b-4dd6-8e96-05dfa6e1bedf","http://resolver.tudelft.nl/uuid:4d76905a-336b-4dd6-8e96-05dfa6e1bedf","Dynamics of Organic Carbon Molecules in Oxbow Lakes of Gangetic Plains","Ghosh, D. (Indian Institute of Science); Kumar, S. (TU Delft Applied Geology); Donselaar, M.E. (TU Delft Applied Geology); Corroto, C. (Agua Y Saneamientos Argentinos (AYSA)); Ghosh, A.K. (Mahavir Cancer Sansthan and Research Centre, Patna (Bihar))","","2021","The Ganges Delta is a key area where elemental contamination of groundwater constitutes a human catastrophe. The delta plain geomorphology comprises a large number of abandoned meander bends or oxbow lakes (Donselaar et al., 2017; Ghosh et al., 2021) characterized by an anoxic environment in the lower part of the lake water column (hypolimnion). Here we present the critical role of these abandoned-river channels forming oxbow lakes. The geomorphological the juxtaposition of (a) abandoned channels (or: oxbow lakes) where the cocktail of organic matter and sediment leads to the release of various elements, (b) the topographically higher point bars where the released elements accumulate in the aquifer and provide a blueprint to explain the origin and localization of elemental toxicity. Dissolved organic matter (DOM) is implicated in the mobilization of elements via microbial metabolic processes. Organic matter (OM) is preserved in this environment and provides a perfect environment for microbial oxidation and mobilization of Fe-oxides. Additional deposition of human-introduced sewage wastes adds to a rich source of nutrients to the indigenous microbial communities.
A multidisciplinary approach was effective in understanding the geomorphology of river meanders, forming abandoned channels, which act as a growth bed for biomass. While acting as an incubator for primary production (lake vegetation dynamics), and subsequent organic debris accumulation (anoxic, hypolimnion water column), where selective preferential preservation of organic carbon compound (anoxic sediment base) occur. We have described how organic compound infiltration, deposition and abundance depends on their hydrophobicity, molecular weights and bioavailability and further, due to diagenetic alteration (microbial metabolic oxidation). Different classes of surface derived organic carbon from vegetation with anthropogenic inputs, can have different effects on the mineral weathering and in controlling the downstream cationic fluxes such as Fe, Mn, As, F etc. and contamination of aquifers in various river plains across the world.
One of the applications of the model will be for ancient Southern Mesopotamia, the pluvial land between the two rivers Euphrates and Tigris. Our knowledge of irrigation management and irrigated-landscapes in southern Mesopotamia fairly scant due to lack of data, but also because attention for the details of irrigation management has been ignored in archaeological analysis to date. IRABM offers options to synchronize the general features of irrigation systems to the specifics of Mesopotamia. How to represent ancient Mesopotamia in IRABM is the key question we address in this paper.
Given the low precipitation, the available water in Mesopotamia’s watercourses for cultivation was vital. This prompted the establishment of irrigated agriculture, leading to its sophisticated irrigation systems over time. Management of irrigation activities is both related to water volumes in the different (levels of) water courses, and to the size of a system. Because of the expanding Mesopotamian society, and this its irrigated areas, the unpredictable water availability, and the threat of water scarcity during the crop growing period, coordinating issues were critical.
How to present ancient Mesopotamian irrigation systems in IRABM and how to fully explore the temporal and spatial coordination issues is our current challenge. Using the standard composition of irrigation systems in the primary canal, secondary canals, and tertiary canals, we can draft sizes of these levels. The cultivated size of agricultural land varied among the different levels of canals. Generally, the primary canal would supply 5 to 6 villages, while the second and tertiary canals might irrigate land in 2 to 3 villages and 1 village, respectively. The main crops were winter crops (barley and wheat). The water regimes of the two rivers are characterized by great, rather unpredictable fluctuations that do not coincide with winter crops.
This presentation will discuss how the data on ancient Mesopotamian irrigation (including water availability in rivers, canals, and fields, and surface areas of irrigated landscapes) can be meaningfully included in an ABM that allows studying how small/short processes contribute to large-scale patterns and processes occurring in irrigation systems.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:dba85f6e-7160-40e6-a55b-50df3dfd7c46","http://resolver.tudelft.nl/uuid:dba85f6e-7160-40e6-a55b-50df3dfd7c46","The Barsha Pump: One Way to (Cleanly) Lift Water, Many Ways to Deliver Smallholder Irrigation","Intriago Zambrano, J.C. (TU Delft Water Resources); Michavila, Jaime (aQysta); Diehl, J.C. (TU Delft Design for Sustainability); Ertsen, M.W. (TU Delft Water Resources)","","2021","","","en","abstract","","","","","","Accepted Author Manuscript","","2021-10-02","","","Water Resources","","",""
"uuid:e6bc3008-417f-44cc-88bd-5eeadbe95cdb","http://resolver.tudelft.nl/uuid:e6bc3008-417f-44cc-88bd-5eeadbe95cdb","Do cyclists need HMIs in future automated traffic?","Berge, S.H. (TU Delft Transport and Planning); Hagenzieker, Marjan (TU Delft Transport and Planning); Farah, H. (TU Delft Transport and Planning); de Winter, J.C.F. (TU Delft Human-Robot Interaction)","","2021","","","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:bc3a8e50-ad59-4934-84dd-e63418ad5a40","http://resolver.tudelft.nl/uuid:bc3a8e50-ad59-4934-84dd-e63418ad5a40","Fluid mud monitoring using optical fibers combined with DAS and DTS","Buisman, M. (TU Delft Applied Geophysics and Petrophysics; Port of Rotterdam); Kiers, Tjeerd (Student TU Delft); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Pefkos, M. (Deltares); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics)","","2021","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:9a817a97-296c-45f6-99d8-1b749865cc4c","http://resolver.tudelft.nl/uuid:9a817a97-296c-45f6-99d8-1b749865cc4c","Impact of organic matter on rheological behavior of fine-grained sediment","Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Zander, F. (TU Delft Geo-engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Gebert, J. (TU Delft Geo-engineering); Chassagne, C. (TU Delft Environmental Fluid Mechanics)","","2021","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:23887cc8-d0fb-45ba-84b9-3fa02f3ee27c","http://resolver.tudelft.nl/uuid:23887cc8-d0fb-45ba-84b9-3fa02f3ee27c","Controls on the effect of organic matter decay on sediment rheological properties","Zander, F. (TU Delft Geo-engineering); Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chassagne, C. (TU Delft Environmental Fluid Mechanics); Gebert, J. (TU Delft Geo-engineering)","","2021","","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:bfadebb2-a02c-4aee-94b3-4d7994080962","http://resolver.tudelft.nl/uuid:bfadebb2-a02c-4aee-94b3-4d7994080962","Testing water injection dredging for regular port maintenance","Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Rutgers, Ronald (Port of Rotterdam Authority); Hupkes, Edwin (Port of Rotterdam)","","2021","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:f703c549-363b-4a36-b6a5-ea50b73ba40f","http://resolver.tudelft.nl/uuid:f703c549-363b-4a36-b6a5-ea50b73ba40f","Remote co-development of a design education toolkit for children rural Kenya","Westerhof, M.B. (Student TU Delft); Gielen, M.A. (TU Delft Design Conceptualization and Communication); van Boeijen, A.G.C. (TU Delft Design Aesthetics); Jowi, James Otieno (SRI Kenya)","","2021","","design education; children; learning through play; rural communities; Covid-19; culture-sensitive design","en","abstract","","","","","","Abstract based on a Master Graduation project by Marten Westerhof, report archived at the TU Delft repository; http://resolver.tudelft.nl/uuid:8ae09e82-28bb-4000-b7da-0613b1e3d0a2","","","","","Design Conceptualization and Communication","","",""
"uuid:b8255881-210d-4409-b9c5-8a9c49c57ae9","http://resolver.tudelft.nl/uuid:b8255881-210d-4409-b9c5-8a9c49c57ae9","Modelling Mineral-Scaling in Geothermal Reservoirs Using Both a Local Equilibrium and a Kinetics Approach","Hussain, A.A.A. (TU Delft Applied Geophysics and Petrophysics); Khoshnevis Gargar, N. (TU Delft Reservoir Engineering); Meulenbroek, B.J. (TU Delft Mathematical Physics); van der Star, Wouter R L (Deltares); Bruining, J. (TU Delft Reservoir Engineering); Claringbould, Johan (Veegeo); Reerink, Ayla (Veegeo); Wolf, K.H.A.A. (TU Delft Applied Geophysics and Petrophysics)","","2021","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:a50a63b9-6e60-482e-8adc-1c95a387f4b1","http://resolver.tudelft.nl/uuid:a50a63b9-6e60-482e-8adc-1c95a387f4b1","Q methodology among smallholders: Challenges and best practices of a participatory approach","Intriago Zambrano, J.C. (TU Delft Water Resources); Diehl, J.C. (TU Delft Design for Sustainability); Ertsen, M.W. (TU Delft Water Resources)","","2021","Smallholder farming is a backbone of millions of livelihoods in the Global South. It provides up to 80% of the food demanded in Sub-Saharan Africa and Asia while scarcely occupying 12% of the global farmland. About 1.5 billion deeply poor households—especially those located in rural areas—depend directly on smallholder agriculture. Stimulating its sustainable intensification is thus of utmost importance in the fulfilment of SDG 2: Zero Hunger and SDG 1: No poverty. Despite decades of (top-down) scientific research, technology transfer and international aid, effective development of this sector remains a summit hard to reach. Profound heterogeneity of smallholder farming systems exacerbates the challenges of this endeavor. Their intricate differences does not only make a single, ultimate development model impractical/impossible, but ignoring them leads us to biases that result in leaving the most disadvantaged out.
We argue that well facilitated participatory research is a sounder way to understand, and hence to act. First, it enables a bottom-up, co-creative process of mutual generation of knowledge together with relevant stakeholders. Second, it gives voice to the (generally) voiceless, therefore turning into a more inclusive and empowering exercise. We resorted to Q-methodology—a powerful qualiquantological participatory method—to explore smallholder adoption of sustainable irrigation technologies in Nepal and Indonesia. We interviewed 19 farmers and 24 experts about the uptake of a hydro-powered water pump commercially known as the Barsha pump. Through this research technique, we found three different viewpoints that placed themselves beyond typical social constructs of smallholder farming (e.g. country, land size). This deeper understanding may become an enabler for a more context-sensitive transfer of farming technology. On the flipside, the implementation of Q methodology in low-resource (rural) settings still poses a number of underreported challenges that are worth discussing, especially in light of big shocks such as the ongoing COVID-19 pandemic. We therefore raise questions such as, which good practices facilitate the application of Q methodology in low-resource settings? How to empower local researchers with a method that remains ‘property’ of developed countries? How to democratize the tools to allow people to learn better about themselves?","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:adc05b56-99c5-4796-8602-d06c6e5aef33","http://resolver.tudelft.nl/uuid:adc05b56-99c5-4796-8602-d06c6e5aef33","An experimental study on trailing edge crack detection for wind turbine blade using airfoil aerodynamic noise","Zhang, Y. (TU Delft Wind Energy); Avallone, F. (TU Delft Wind Energy); Watson, S.J. (TU Delft Wind Energy)","","2021","Recent decades have witnessed more and more wind turbines (WTs) being installed onshore and offshore. Health condition monitoring for WTs structures and components is increasingly becoming a compelling concern for stable power output and operational safety of a wind farm [1]. Blade damages seem to occur with a higher probability ahead of other components (e.g., gearbox and generator) damages [2]. After reviewing traditional damage detection approaches and their limitations [3], in this research a new non-contactable approach to detecting trailing edge (TE) damages is proposed based on airfoil aerodynamic noise measurements using a microphone array. In the experiment, four changeable TE parts with rectangular cracks (damaged width W of 0.2mm, 0.5mm, 1.0mm and 2.0mm) for a NACA0018 airfoil (chord C=200mm, span L=400mm) are designed and an example with W=0.2mm is shown in Fig.(a). The TEs with cracks have the same solid thickness as the baseline one (h_solid=0.76mm, standard NACA0018 airfoil TE thickness with chord of 200mm) but different dimensions of total TE thickness (h=W+h_solid). A phased microphone array with 64 microphones is used for acoustic measurement then beamforming is applied to extract TE noise and source power integration is performed within a 200×200mm2 region centred at TE midpoint [4][5]. Fig.(b) shows sound pressure levels (SPLs) L_p at the integrated region of four damaged cases as well as baseline with the frequency resolution of 10Hz under the freestream velocity U of 35m/s and geometrical angle of attack (AoA) alpha of 0º. The cases with smaller cracks show less remarkable tonal peaks compared with the one of W=2.0mm (~4dB); when the crack size is smaller the spectral peak broadens. These peaks or humps are attributed to the periodic vortex shedding from blunt TEs. Fig.(c) shows the SPL differences Delta L_p between the damaged cases and baseline; frequency is normalized as TE-thickness-based Strouhal number St. Local maxima of Lp are present at approximately St = 0.1 [6]. In the experiment, it is difficult to extract the spectral peaks or humps if the effective AoA (alpha*) [6] is more than 2.40º because the boundary layer on suction side becomes thicker and the asymmetry of boundary layers prevents coherent and periodic vortex shedding [7]. In Fig.(d), the discrete points are the St at peak L_p (St_peak) versus the ratio of TE thickness and averaged displacement thickness of pressure and suction sides (overline delta *) extracted from available cases (U=15m/s, 20m/s, 25m/s, 30m/s and 35m/s); the grey and blue curves are obtained from models reported in [6] with solid angle (Psi) of 20º and 23.76º (baseline solid angle), respectively. The points of St_peak versus thickness ratio show a good agreement with the prediction model [6]. This means that particularly for smaller cracks at the first stage of damaged process, the effect of solid angle can be neglected and considered as a minor and adjunctive factor. The TE thickness retrieved through the application of the model can be used as a prediction of the damage level. Additional data obtained from experiments with turbulent inflow will be presented to assess if the approach proposed is still feasible in more realistic turbulent inflow conditions. Keywords: wind turbine blade; trailing edge crack; damage detection; aerodynamic noise. Images: Link: https://s3-eu-west-1.amazonaws.com/static.vcongress.de/cms/forwind/paper/417dd783-7a7c-424d-a4d3- 55ce31fa41e1.png Description: (a) An example of NACA0018 airfoil with a TE crack of 0.2mm. (b) SPLs with resolution of 10Hz (U=35m/s and alpha=0º). (c) Corresponding SPL differences compared with baseline case normalized as peak St. (d) Relations of peak St and thickness ratio: discrete points are the experimental date; grey and black curves are prediction models Brooks et al. proposed with solid angle of 20º and 23.76º. References: [1] Tautz-Weinert, J. and Watson, S.J., 2016. Using SCADA data for wind turbine condition monitoring–a review. IET Renewable Power Generation, 11(4), pp.382-394. [2] Yang, W., Peng, Z., Wei, K. and Tian, W., 2016. Structural health monitoring of composite wind turbine blades: challenges, issues and potential solutions. IET Renewable Power Generation, 11(4), pp.411-416. [3] Du, Y., Zhou, S., Jing, X., Peng, Y., Wu, H. and Kwok, N., 2020. Damage detection techniques for wind turbine blades: A review. Mechanical Systems and Signal Processing, 141, p.106445. [4] Merino-Martínez, R., Carpio, A.R., Pereira, L.T.L., van Herk, S., Avallone, F., Ragni, D. and Kotsonis, M., 2020. Aeroacoustic design and characterization of the 3D-printed, open-jet, anechoic wind tunnel of Delft University of Technology. Applied Acoustics, 170, p.107504. [5] Carpio, A.R., Avallone, F., Ragni, D., Snellen, M. and van der Zwaag, S., 2020. Quantitative criteria to design optimal permeable trailing edges for noise abatement. Journal of Sound and Vibration, 485, p.115596. [6] Brooks, T.F., Pope, D.S. and Marcolini, M.A., 1989. Airfoil self-noise and prediction. [7] Moreau, D.J. and Doolan, C.J., 2016. Tonal noise production from a wall-mounted finite airfoil. Journal of Sound and Vibration, 363, pp.199-224.","wind turbine blade; trailing edge crack; damage detection; aerodynamic noise","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:7668a767-691f-4e4a-addf-0938a8f4c386","http://resolver.tudelft.nl/uuid:7668a767-691f-4e4a-addf-0938a8f4c386","Sharing in five: the disruptive urban freight transport challenge","van Duin, Ron (TU Delft Transport and Logistics; Rotterdam University of Applied Sciences); van den Band, N. (Rotterdam University of Applied Sciences); de Vries, A. (Rotterdam University of Applied Sciences); Ouasghiri, Mohamed (Rotterdam University of Applied Sciences); Verschoor, P. (Rotterdam University of Applied Sciences); P.M.J., Warffemius (Rotterdam University of Applied Sciences)","","2021","","Sharing logistics","en","abstract","","","","","","","","","","","Transport and Logistics","","",""
"uuid:f1cf2912-b639-4a5c-9bb5-5c26ceb445e6","http://resolver.tudelft.nl/uuid:f1cf2912-b639-4a5c-9bb5-5c26ceb445e6","Modelling dynamic fault slip and seismic wavefield for production-induced seismicity in Groningen","Ruan, J. (TU Delft Applied Geophysics and Petrophysics); Ghose, R. (TU Delft Applied Geophysics and Petrophysics); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics)","","2021","Induced seismicity from a gas-producing region such as Groningen is believed to be caused by reservoir depletion due to long-term gas production. However, because of the complexity and uncertainty regarding the underground structure and composition, it is difficult to quantify the effect on induced seismicity due to gas production. Here we use finite-element modelling to investigate the seismogenic potential of a pre-existing fault reactivated due to fluid depletion, considering different model settings. By applying quasi-static poroelastic loading representing reservoir depletion, the stress and strain fields are derived from the resulting displacement field. The equilibrium of the fault is then evaluated using either rate-and-state or slip-weakening behaviour for friction. When the critical state is reached on the fault, where the shear stress is greater than the friction, the reactivation of the fault takes place. This reactivation is simulated by using a dynamic solver to observe the propagation and the arrest of the dynamic faulting, as well as the resultant wavefield due to seismic slip. By comparing the depletion value at both aseismic and seismic ruptures, and looking at the stress distribution on the fault, the pattern of rupture nucleation, and the resulting seismic wavefield, we are able to evaluate separately the effect of different model settings, including the geometry and material property of both caprock and reservoir, reservoir depletion pattern, and the friction law. Furthermore, by combining our study with the observed seismic wavefield, it is possible to obtain useful insights on the spatial variation in the source region.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:a54e8ca6-6f2f-46d9-8cbf-0daaaa2f83b6","http://resolver.tudelft.nl/uuid:a54e8ca6-6f2f-46d9-8cbf-0daaaa2f83b6","Perfect Fit: een identiteitsgebaseerde virtuele coach die ondersteunt bij stoppen met roken en meer bewegen","Meijer, Eline (Universiteit Leiden); Penfornis, Kristell (Universiteit Leiden); Albers, N. (TU Delft Interactive Intelligence); Scheltinga, Bouke (University of Twente; Roessingh Research and Development); Atsma, Douwe (Universiteit Leiden); Chavannes, Niels (Universiteit Leiden); van der Burg, Sven (Netherlands eScience Center); Brinkman, W.P. (TU Delft Interactive Intelligence); Gebhardt, Winnie (Universiteit Leiden)","","2021","Duurzame gedragsverandering is moeilijk, zelfs wanneer het huidige gedrag een groot risico vormt voor de gezondheid. Gedragsverandering wordt gemakkelijker als het nieuwe gedrag past bij hoe een individu zichzelf ziet (identiteit). Virtuele coaching is veelbelovend om gedrags- en identiteitsverandering te ondersteunen, omdat het altijd beschikbaar is in de eigen omgeving en optimaal kan worden gepersonaliseerd.","Virtual coach; Patient journey; Physical Activity; Behavior change; Smoking cessation; eHealth","nl","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:7dfc1ef5-0188-49ff-885a-b9fab8ed3b62","http://resolver.tudelft.nl/uuid:7dfc1ef5-0188-49ff-885a-b9fab8ed3b62","Water injection for dredging sediment in reservoirs – insights from preliminary experiments","Buffon, P. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; IHE Delft Institute for Water Education); Valero, Daniel (IHE Delft Institute for Water Education); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Franca, M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; IHE Delft Institute for Water Education)","","2021","","Sediment dynamics; Turbidity currents; Sustainable infrastructure","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:df8c3bfb-b3ba-420d-b07e-7ca948b0ae0b","http://resolver.tudelft.nl/uuid:df8c3bfb-b3ba-420d-b07e-7ca948b0ae0b","Impact of Weir Location on Discharge Partitioning in Longitudinal Training Walls","Czapiga, Matthew J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Viparelli, Enrica (University of South Carolina)","","2021","","Longitudinal Training Walls; Hydrodynamics","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:85e0f860-c2e2-423b-8353-bbb31895c144","http://resolver.tudelft.nl/uuid:85e0f860-c2e2-423b-8353-bbb31895c144","Morphological Impacts of Porcupine River Training Structures","Irving, Meghan (Student TU Delft); Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)","","2021","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:7ccdcd17-9ac1-48d4-9c57-47acd8e5012e","http://resolver.tudelft.nl/uuid:7ccdcd17-9ac1-48d4-9c57-47acd8e5012e","Scenarios for Controls of River Response to Climate Change in the Lower Rhine River","Ylla Arbos, C. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2021","","Climate Change; River Controls; Lower Rhine River","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:b0d67253-32f6-4106-8c2b-b77ce7de4246","http://resolver.tudelft.nl/uuid:b0d67253-32f6-4106-8c2b-b77ce7de4246","Insight into the local bed-level dynamics to assist management of multi-functional rivers","van Denderen, R. Pepijn (University of Twente); Paarlberg, Andries J. (HKV Consultants); Augustijn, Denie C.M. (University of Twente); Schielen, R.M.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Rijkswaterstaat)","","2021","","River morphology; bed level dynamics","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:008b34c0-100c-4243-9a30-7ea7b7f26bd4","http://resolver.tudelft.nl/uuid:008b34c0-100c-4243-9a30-7ea7b7f26bd4","Long-term bed level change in the Dutch Rhine branches and its impacts to water availability","Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); van Walsem, Thomas (Rijkswaterstaat)","","2021","","Morphology; flow-distribution; bed degradation","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-08-12","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:d7303900-3284-4ce8-9453-cf77cfcc6d18","http://resolver.tudelft.nl/uuid:d7303900-3284-4ce8-9453-cf77cfcc6d18","On the Power Radiated by Photo Conductive Sources","Fiorellini Bernardis, A. (TU Delft Tera-Hertz Sensing); Zhang, H. (TU Delft Tera-Hertz Sensing); Sberna, P.M. (TU Delft EKL Processing); Bueno Lopez, J. (TU Delft Electronics); Neto, A. (TU Delft Tera-Hertz Sensing); Llombart, Nuria (TU Delft Tera-Hertz Sensing)","","2021","The time evolution of voltages and currents in a pulsed photo conductive antenna (PCA) source is evaluated resorting to a rigorous procedure that stems from semiconductor physics first, to define the phenomena involved in the generation of the photocurrent, and then relies on an equivalent circuit in time domain, providing a direct estimation of the power generated by the PCA as well as its spectral distribution. The circuit model is validated via a campaign of measurements of standard PC antenna sources. The saturation phenomena in the THz radiated power occurring at large optical excitation levels, previously observed by the scientific community and associated to different phenomena, are accurately predicted by the present method, which ascribe their main cause to the feedback from the antenna: indeed, the electromagnetic field generated by the device tend to reduce the strength of the forcing field used to accelerate the photo-carriers.","Equivalent circuit; Photoconductive antennas (PCAs); Terahertz (THz); THz radiated power; THz sources; THz technology","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Tera-Hertz Sensing","","",""
"uuid:807d484a-d5ba-4be5-97b6-e3fcf5a6c452","http://resolver.tudelft.nl/uuid:807d484a-d5ba-4be5-97b6-e3fcf5a6c452","Design Thinking as a strategy to inculcate Problem-based Learning (PBL) in undergraduate education across South Asian Universities","Acharya, Shakuntala (Indian Institute of Science); Bhatt, Apoorv Naresh (Indian Institute of Science); Chakrabarti, Amaresh (Indian Institute of Science); Delhi, Venkata Sk (Indian Institute of Science); Diehl, J.C. (TU Delft Design for Sustainability); Mota, Nelson (TU Delft Space & Type); Jurelionis, Andrius (Kaunas University of Technology); Subra, Riina (Aalto University)","","2021","The Bologna declaration states that, “successful learning and studying in higher education should involve students in deep learning”. However, a survey of faculty across institutes in Nepal and Bhutan highlights that the undergraduate students in engineering and management lack skills needed to be industry-ready.
They face difficulty in getting employed after graduation and if placed, then struggle during their employment due to insufficient practical experience, lack of good communication skills and unawareness of larger socio-economic contexts. The Erasmus+ funded project, “Strengthening Problem-based learning in South Asian Universities”(PBL South Asia) is an endeavour to address these pressing concerns in education quality, employability and overall sustainable development of the region and to imbibe deep learning capabilities. Therefore, as an empirical study to clarify and in turn, inculcate PBL in South Asian undergraduate education, the young faculty of the inexperienced institutes from Nepal and Bhutan, alongside the students from the experienced institutes from India and Europe, were mentored by faculty and researchers from the latter to undertake multidisciplinary case studies.
The strategy of ‘Design Thinking’ was employed to methodologically guide the cases and keep it consistently problem-based, i.e., the learning is driven by the
problem with no one correct solution. Results showed that the participants reflected improvement in problem-solving skills and increased motivation, apart from enhanced collaboration and improved communication ability. Based on these findings, further development of curricula to imbibe PBL in its existing courses and guidelines to train the trainers for implementation of the same, is currently in progress.","University Education; South Asia; PBL; Design Thinking; Design Pedagogy; Problem-based Learning","en","abstract","","","","","","","","","","","Space & Type","","",""
"uuid:1c16fe66-4ba8-45b1-97f2-c331c0d3ce06","http://resolver.tudelft.nl/uuid:1c16fe66-4ba8-45b1-97f2-c331c0d3ce06","Geodynamics of the Romanian Territory Inferred from a Dense Continuous GNSS Network","Muntean, A. (National Institute for Earth Physics); Ambrosius, B.A.C. (TU Delft Astrodynamics & Space Missions); Mocanu, V. (University of Bucharest); Nastase, Eduard Ilie (National Institute for Earth Physics; University of Bucharest)","","2021","Over the last two decades the Romanian territory has been covered by a dense permanent Global Navigation Satellite System (GNSS) network, presently including more than one hundred stations established and maintained by several Romanian agencies. We refer to these as continuous GNSS (cGNSS) stations. For the study presented here we exclusively use the data of the Global Positioning System (GPS), which is the oldest and most widely-used element of GNSS. At the beginning of this century, we realized the potential of cGNSS for scientific purposes. Applications include monitoring of crustal deformations associated with the Carpathian orogen and the neighbouring platforms in Romania, in correlation with tectonic processes in South-East Europe (Africa-Europe plate interactions), observation of (vertical) crustal motions to study the surface expression of deep earthquakes in the Eastern Carpathians Bending Zone (Vrancea region). This study presents the results of our analysis of the aggregated cGNSS measurements in Romania. The results cover the period 2000-2020, but focus on the period 2013-2020 when the majority of the stations became operational. We processed the Receiver Independent Exchange Format (RINEX) daily data (sampled at 30-second intervals) of all available stations. For this purpose, we used the GipsyX scientific GPS analysis software, applying the so-called Precise Point Positioning (PPP) strategy. This resulted in time-series of the horizontal and vertical position components of each station in the International Terrestrial Reference Frame 2014 (ITRF14). Subsequently, the time-series were converted to a stable Eurasian tectonic reference plate using the ITRF14 plate rotation model for Eurasia. All data processing in this study is based on this reference frame. The results of this complex, long-term study indicates that the Romanian territory trends to move slightly southward relative to stable Eurasia, at velocity rates of about 1.0 mm/yr in the north and up to 3.0 mm/yr in the south. This may be an indication of plate-stretching due to slab-rollback of the African plate relative to the Eurasian plate. Until now we did not find an obvious correlation between the deep Vrancea earthquakes and (vertical) surface motions. That is probably because the recent earthquakes were too small.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:c61e9c8d-ade3-421b-995f-cc8a0d4ff26f","http://resolver.tudelft.nl/uuid:c61e9c8d-ade3-421b-995f-cc8a0d4ff26f","The Influence of Situational Complexity, Stress, and Stated Skill on Cyclist Gaze Behaviour","Gadsby, April (Georgia Institute of Technology); Hagenzieker, Marjan (TU Delft Transport and Planning); Watkins, Kari (External organisation); Tsai, James (External organisation)","","2021","","","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:82f762d6-88d3-4fcc-b75a-6eed9f2f3151","http://resolver.tudelft.nl/uuid:82f762d6-88d3-4fcc-b75a-6eed9f2f3151","3D-impaction printing of porous layers","van Ginkel, H.J. (TU Delft Electronic Components, Technology and Materials); Roels, P. (VSPARTICLE); Boeije, M.F.J. (VSPARTICLE); Pfeiffer, T.V. (VSPARTICLE); Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials); Schmidt-Ott, A. (TU Delft ChemE/Materials for Energy Conversion and Storage; VSPARTICLE)","","2020","Porous layers composed of nanoparticles (NPs) have a wide range of (potential) applications including catalysts, (chemical) sensors, thermoelectric materials and electronics. These application domains will profit strongly from our NP printing process which is flexible with respect to i) the composition of the NPs and ii) the possibility of composing arbitrary mixtures of different NPs (external mixtures). Our printer is a combination of a spark ablation NP generator supplying unagglomerated 5 nm particles with a hypersonic impactor equipped with an xyz stage. The profiles of printed lines are measured, and the impact velocity is described by theory. Printed gold lines on a polymer contact lens are sufficiently sintered by the impact energy to show the plasmon mode of gold (“golden“ color).","3D printing; nanoporous; catalysts; sensors; SERS","en","abstract","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:95aa949d-7d16-48db-90b3-752f9c6a1b0e","http://resolver.tudelft.nl/uuid:95aa949d-7d16-48db-90b3-752f9c6a1b0e","Feedback between ice dynamics and bedrock deformation with 3D viscosity in Antarctica","van der Wal, W. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions); van Calcar, C.J. (Student TU Delft); de Boer, Bas (Vrije Universiteit Amsterdam); Blank, B. (TU Delft Astrodynamics & Space Missions)","","2020","class=""MsoNormal"">Over glacial-interglacial cycles, the evolution of an ice sheet is influenced by Glacial isostatic adjustment (GIA) via two negative feedback loops. Firstly, vertical bedrock deformation due to a changing ice load alters ice-sheet surface elevation. For example, an increasing ice load leads to a lower bedrock elevation that lowers ice-sheet surface elevation. This will increase surface melting of the ice sheet, following an increase of atmospheric temperature at lower elevations. Secondly, bedrock deformation will change the height of the grounding line of the ice sheet. For example, a lowering bedrock height following ice-sheet advance increases the melt due to ocean water that in turn leads to a retreat of the grounding line and a slow-down of ice-sheet advance. GIA is mainly determined by the viscosity of the interior of the solid Earth which is radially and laterally varying. Underneath the Antarctic ice sheet, there are relatively low viscosities in West Antarctica and higher viscosities in East Antarctica, in turn affecting the response time of the above mentioned feedbacks. However, most ice-dynamical models do not consider the lateral variations of the viscosity in the GIA feedback loops when simulating the evolution of the Antarctic ice sheet. The method developed by Gomez et al. (2018) includes the feedback between GIA and ice-sheet evolution and alternates between simulations of the two models where each simulation covers the full time period. We presents a different method to couple ANICE, a 3-D ice-sheet model, to a 3-D GIA finite element model. In this method the model computations alternates between the icesheet and GIA model until convergence of the result occurs at each timestep. We simulate the evolution of the Antarctic ice sheet from 120 000 years ago to the present. The results of the coupled simulation will be discussed and compared to results of the uncoupled ice-sheet model (using an ELRA GIA model) and the method developed by Gomez et al. (2018).","","en","abstract","","","","","","","","","","","Physical and Space Geodesy","","",""
"uuid:9486f81d-32a0-44cc-8571-26a1afe918b6","http://resolver.tudelft.nl/uuid:9486f81d-32a0-44cc-8571-26a1afe918b6","Design and Development of the VenSpec-H Instrument","Vanhamel, J. (TU Delft Space Systems Egineering); Vandaele, Ann-Carine (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Neefs, Eddy (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Robert, Séverine (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Jacobs, Lars (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Berkenbosch, Sophie (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Thomas, Ian (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Beeckman, Bram (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Moelans, Wouter (OIP, N.V. Westerring 21); Lesschaeve, Stefan (OIP, N.V. Westerring 21); Algoedt, Aaron (OIP, N.V. Westerring 21); De Vos, Lieve (OIP, N.V. Westerring 21); Vaughan, Matthew (European Space Agency (ESA))","","2020","Introduction:
VenSpec-H (Venus Spectrometer with High resolution), part of ESA’s EnVision M5 mission to Venus, is currently in Phase A (started in January 2019) in which the feasibility of the instrument is studied.
The instrument successfully passed the mid-term mission consolidation review (May 2020). The mission selection review by ESA is planned beginning 2021.
Scientific objectives:
EnVision aims at the investigation of the geo-logical activity on Venus and its relationship with the atmosphere, in order to understand how Venus and Earth could have evolved so differently.
The VenSpec suite consists of VenSpec-H and two other instuments, VenSpec-M, an IR mapper, and VenSpec-U, a UV spectrometer. The overall scientific objective of this suite is to search for temporal variations in surface temperatures and tropospheric concentrations of gases indicative for volcanic eruptions. Additionally, the study of surface-atmosphere interactions and weathering by mapping surface emissivity and tropospheric gas abundances is also part of the mission.
The goal of the VenSpec-H instrument is to target different molecular species related to volcanism and surface changes on Venus. The measurement of the H2O and HDO constituents of the Venus’ atmosphere, as well as the probing of H2O, HDO, CO, OCS, SO2 in a 30 – 40 km altitude range is planned on the nightside and above the cloud top on the dayside. Several spectral windows are used to monitor these constituents in the range of 1 to 2.5 μm. VenSpec-H works in a nadir viewing
geometry.
Instrument design:
VenSpec-H is a spectrometer, hence, the heart of the instrument consists of a spectrometer section where the incoming uniform light is diffracted into its spectral components. This section is cooled down to approximately -45 °C in order to suppress as much as possible the thermal background.
This is achieved by means of a large dedicated radiator. The warm baseplate is kept around 0 °C (by means of a small warm section radiator). The warm baseplate is mounted to the spacecraft deck using three kinematic feet.
The diffracting element in VenSpec-H is an echelle grating. The incoming light is first rendered parallel on a parabolic mirror before it hits the grating. The parallel light diffracted from the grating is focused by a dedicated optical system towards the detector.
The cold spectrometer section is preceded by a warmer band selection section. It is a combination of a filter wheel and a butcher’s block of two horizontal filters (on top of the spectrometer entrance slit).
The spectrometer section is followed by the detector section. The detector is an Integrated Dewar Detector Cooler Assembly (IDDCA). The dewar window sits in the exit aperture of the spectrometer section. The Focal Plane Array (FPA) is located a bit further in the focal plane of the spectrometer exit optics. The FPA is cooled by means of a cryocooler.
Preliminary optical and thermal analysis and modelling has been performed. The instrument design relies partly on heritage from the NOMAD instrument, which is a
spectrometer suite on board ESA’s Trace Gas Orbiter (TGO) satellite, a part of the ExoMars 2016 mission.
Ongoing tests:
Currently, thermo-mechanical prototyping work is performed using the facilities at BIRA-IASB, in order to prove the feasibility of some critical systems. One of the most critical elements in the
VenSpec-H design is the cold section and its interconnection to a warm support structure. Several tests are planned.
In a first series of tests, the thermal conductivity is investigated by using different types of feet. Using a fixed cold temperature at one side, and knowing heat injection at other side, a ΔT can be determined.
In a second series of tests, the mounting mechanism of the cold section onto the warm section using a fixed connection on one side and a gliding pin on the other side, is tested. For this, an instrument prototype (including mass dummies for optical elements) is used, keeping the cold section at -25°C, while the warm base plate is at +20°C, the retraction and dilatation of the cold section is measured using capacitive sensors.
The different results obtained during these tests will be presented at the conference.
Acknowledgements:
This work has been performed with the support of the Belgian Science Policy Office (BELSPO), with the financial and contractual coordination by the ESA Prodex Office.","","en","abstract","","","","","","","","","","","Space Systems Egineering","","",""
"uuid:2308e2d6-bcd6-47fe-aec6-51b285bce461","http://resolver.tudelft.nl/uuid:2308e2d6-bcd6-47fe-aec6-51b285bce461","PRIDE: Ground-based VLBI observations for Spaceborne Probes","Pallichadath, V. (TU Delft Astrodynamics & Space Missions); Gurvits, L. (TU Delft Astrodynamics & Space Missions); Dirkx, D. (TU Delft Astrodynamics & Space Missions); Vermeersen, L.L.A. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions)","","2020","Planetary Radio Interferometry and Doppler Experiment (PRIDE) will exploit the signal recording and processing technology developed originally for Very Lonag Baseline interferometric (VLBI). The essence of PRIDE is in observing the spacecraft radio signal with a network of Earth-based radio telescopes. The PRIDE technique developed at the Joint Institute for VLBI ERIC (JIVE) together with its partners was used for several experiments with several ESA planetary science missions. It has been chosen by ESA as one of the eleven experiments of the Jupiter Icy Moons Explorer (JUICE), the first Large-class mission in the ESA’s Cosmic Vision 2015–2025 program. The mission is scheduled for launch in 2022.","","en","abstract","","","","","","EPSC Abstracts Vol., EPSC2020-647, 2020","","","","","Astrodynamics & Space Missions","","",""
"uuid:6eec96dd-9c5c-47ba-b6d1-fcabb8bdc61a","http://resolver.tudelft.nl/uuid:6eec96dd-9c5c-47ba-b6d1-fcabb8bdc61a","Robustness of climate-optimized trajectories and mitigation Potential: flying atm4e","Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Lührs, Benjamin (Universität Hamburg); Dahlmann, K. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Linke, F. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Shine, K.P. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","Aviation can reduce its climate impact by controlling its CO2-emission and non-CO2 effects, e.g. aviation-induced contrail-cirrus and ozone caused by nitrogen oxide emissions. One option is the implementation of operational measures which aim to avoid those atmospheric regions that are in particular sensitive to non-CO2 aviation effects, e.g. where persistent contrails form. Quantitative estimates of mitigation potentials of such climate-optimized aircraft trajectories are required, when working towards sustainable aviation. Results are presented from a comprehensive modelling approach which is working towards identifying such climate-optimized aircraft trajectories. The overall concept relies on a multi-dimensional environmental change function concept, which is capable of providing environmental impact information to air traffic management (ATM) and which in principal could include the noise and air quality impacts. A one-day case study with a weather situation containing regions with high contrail impacts for European air traffic estimated an overall climate impact reduction of about 30% for an increase of costs of 0.5%, relying on best estimate for climate impact information. The climate impact reduction and mitigation potential varies strongly with individual routes. By using a range of different climate metrics, the robustness of proposed mitigation trajectories is assessed. Sustainable ATM needs to integrate comprehensive environmental impacts and associated forecast uncertainties into route optimisation in order to identify robust eco-efficient trajectories.","climate optimisation; air traffic management; eco-efficient trajectories","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:18472a15-5396-433a-9d16-ac09c8d16a2d","http://resolver.tudelft.nl/uuid:18472a15-5396-433a-9d16-ac09c8d16a2d","Climate impact mitigation potential of european air traffic","Lührs, Benjamin (Hamburg University of Technology); Linke, F. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Shine, K.P. (University of Reading)","","2020","Air traffic contributes to anthropogenic global warming by about 5% due to CO2 emissions (about 1/3) and non-CO2 effects (about 2/3) primarily caused by emissions of NOx and water vapour as well as the formation of contrails. Since aviation is expected to maintain its trend to grow over the next decades, mitigation measures are required counteracting its negative effects upon the environment. One of the promising operational mitigation measures which has been subject of the EU project ATM4E, is climate-optimized flight planning using algorithmic climate change functions describing the climate sensitivity as a function of emission location and time. The methodology developed for the use of algorithmic climate change functions in trajectory optimization is described and results of its application to the planning of about 13,000 intra-European flights on one specific day are presented. The optimization problem is formulated as bi-objective continuous optimal control problem with climate impact and fuel burn being the two objectives. Results on individual flight basis indicate that there are three major classes of different routes which are characterized by different shapes of the corresponding Pareto-fronts. For the investigated scenario, results show a climate impact mitigation potential of about 73% which is related with a fuel penalty of 14.5%. However, a climate impact reduction of 50% can already be achieved with 0.75% additional fuel burn.","climate optimization; eco-efficient trajectories; optimal control","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:2f39abf5-15d9-438a-86f8-6941da3c4a4f","http://resolver.tudelft.nl/uuid:2f39abf5-15d9-438a-86f8-6941da3c4a4f","Energy transition in aviation: The role of cryogenic fuels","Gangoli Rao, A. (TU Delft Flight Performance and Propulsion); Yin, F. (TU Delft Aircraft Noise and Climate Effects)","","2020","Aviation is the backbone of our modern society. At present, around 4.5 Billion passengers travel through the air every year and aviation is responsible for around 5 % of anthropogenic causes of Global Warming (Lee et al, 2009). With the increase in global GDP, the number of travellers is expected to increase to 7.5 Billion by 2037 and to around 15 Billion by 2050. Even though the crude oil prices are low at the moment, with finite petroleum reserves available on our planet, it is expected that the Jet fuel prices will increase in the future. Moreover using kerosene causes several emissions which are bad for the environment. Liquefied Natural gas (LNG) and Liquid Hydrogen (LH2) can provide an attractive alternative for aviation.","aviation; energy transition; cryogenic fuels","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:8cb61bf0-d3c7-4a75-b978-294db6367896","http://resolver.tudelft.nl/uuid:8cb61bf0-d3c7-4a75-b978-294db6367896","A New Constraint Programming Model and Solving for the Cyclic Hoist Scheduling Problem","Wallace, Mark (Monash University); Yorke-Smith, N. (TU Delft Algorithmics)","","2020","The cyclic hoist scheduling problem (CHSP) is a well-studied optimisation problem due to its importance in industry. Despite the wide range of solving techniques applied to the CHSP and its variants, the models have remained complicated and inflexible, or have failed to scale up with larger problem instances. This article re-examines modelling of the CHSP and proposes a new simple, flexible constraint programming formulation. We compare current state-of-the-art solving technologies on this formulation, and show that modelling in a high-level constraint language, MiniZinc, leads to both a simple, generic model and to computational results that outperform the state of the art. We further demonstrate that combining integer programming and lazy clause generation, using the multiple cores of modern processors, has potential to improve over either solving approach alone.","","en","abstract","","","","","","The full version of the paper appeared in the journal Constraints.","","","","","Algorithmics","","",""
"uuid:2ac1a5d8-165d-4faa-9281-08ab016de001","http://resolver.tudelft.nl/uuid:2ac1a5d8-165d-4faa-9281-08ab016de001","Learning What to Attend to: Using Bisimulation Metrics to Explore and Improve Upon What a Deep Reinforcement Learning Agent Learns","Albers, N. (TU Delft Interactive Intelligence); Suau, M. (TU Delft Interactive Intelligence); Oliehoek, F.A. (TU Delft Interactive Intelligence)","","2020","Recent years have seen a surge of algorithms and architectures for deep Re-
inforcement Learning (RL), many of which have shown remarkable success for
various problems. Yet, little work has attempted to relate the performance of
these algorithms and architectures to what the resulting deep RL agents actu-
ally learn, and whether this corresponds to what they should ideally learn. Such
a comparison may allow for both an improved understanding of why certain
algorithms or network architectures perform better than others and the devel-
opment of methods that specically address discrepancies between what is and
what should be learned.","Deep Reinforcement Learning; Representation Learning; Bisimulation Metrics; Markovianity","en","abstract","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:c1a391e1-6c95-464e-89d7-3a7a786ac1ae","http://resolver.tudelft.nl/uuid:c1a391e1-6c95-464e-89d7-3a7a786ac1ae","Early detection of stress changes and failure using acoustic measurements","Veltmeijer, A.V. (TU Delft Applied Geophysics and Petrophysics); Naderloo, M. (TU Delft Applied Geophysics and Petrophysics); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics)","","2020","","","en","abstract","","","","","","Accepted Author Manuscript","","2020-09-13","","","Applied Geophysics and Petrophysics","","",""
"uuid:d5db055c-1269-4f64-aa80-1191386f8483","http://resolver.tudelft.nl/uuid:d5db055c-1269-4f64-aa80-1191386f8483","Climate optimization of aircraft operations and design: A review and implications on modelling requirements Pages","Deck, K.T. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (TU Delft Aircraft Noise and Climate Effects); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects); Vos, Roelof (TU Delft Flight Performance and Propulsion); Proesmans, P. (TU Delft Flight Performance and Propulsion); Linke, Florian (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Kaushik Radhakrishnan, Kaushik (Student TU Delft); Niklaβ, Malte (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","Aviation is a highly necessary transport sector in our modern society. It guarantees mobility on a short- and long-range spectrum and is still a growing sector. However, aviation also contributes signi_cantly to the anthropogenic climate change via CO2 and non-CO2 e_ects. One possibility to reduce the climate impact of aviation would be to optimize the aircraft at the design level. Another possibility is to optimize the operations, e.g. to avoid climate sensitive regions in the ight route. To derive modelling capabilities, we review the climate impact of aviation with a focus on climate optimization of aircraft operations and design. The overall climate impact of aviation based on CO2 and non-CO2 e_ects is analyzed under consideration of contrails and di_erent emissions like CO2, NOx, and H2O. The connection to the related temperature change is shown via the climate sensitivity for each species. An overview over the most common climate metrics, including radiative forcing, global warming potential, global temperature potential, and the average temperature response is given in order to _nd the most suitable climate metric for aircraft design purposes. During previous studies within various projects, e.g. WeCare, REACT4C, and ATM4E, climate optimization strategies for aircraft operations were investigated. The aircraft routes regarding the ight path or altitude can be adjusted in regard to climate considerations, also in dependence on the current weather situation. In these projects, climate change functions and algorithmic climate change functions were developed which could potentially facilitate the climate optimized routings. The aircraft design for climate optimization di_ers from the approach to optimize the design for reduced cost or reduced fuel burn. For the climate impact, ying slow and low is bene_cial which was shown in the project CATS, but this is not reected in the current aircraft design. Therefore, previous studies propose redesigned aircraft. The relation between climate, aircraft operations and aircraft design is used to point out the requirements for modelling resulting from that. The focus is on the connection between climate and operations on one side, and on the connection between climate and design considerations on the other side. Currently, the model capacity for aircraft design does not support the climate optimized design. Therefore, deriving climate functions for aircraft design is highly important which will be one of the main goals in the Clean Sky 2 project GLOWOPT (Global-Warming-Optimized Aircraft Design).","","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:5af1866b-c631-4b35-980e-991aa1c3be47","http://resolver.tudelft.nl/uuid:5af1866b-c631-4b35-980e-991aa1c3be47","Transition radiation in an infinite beam discretely supported by nonlinear springs and dashpots","Faragau, Andrei B. (TU Delft Dynamics of Structures); de Oliveira Barbosa, J.M.; Keijdener, C.; Metrikine, A. (TU Delft Offshore Engineering; TU Delft Engineering Structures); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2020","Transition radiation is emitted when a source moves along a straight line with constant velocity and acts on or near an inhomogeneous medium [1]. It occurs, for example, when trains cross areas with substantial variation of track properties (e.g., foundation stiffness) encountered near rigid structures such as bridges; these areas are called transition zones. Apart from potentially giving rise to vehicle instability, transition radiation has been addressed as one of the causes of track and foundation degradation due to the often strong amplification of the stress and strain fields. This leads to a high frequency of maintenance required for transition zones in areas with soft soils, which can be 3–8 times higher than for the regular parts of the railway track. Wave radiation is also generated due to the periodic variation of the support stiffness (i.e., periodically placed sleepers). The periodically supported beam interacting with a vehicle has been addressed in studies on vehicle instability and on the resonant behaviour of the system [2]. Moreover, it has been shown that the periodic supports play a role in the fatigue and corrugation of both wheel and rail [3]. However, most studies consider either the local variation of the foundation stiffness (i.e., transition zones) or the periodic variation of the support stiffness, and not the combination of the two. Furthermore, studies that consider both scales make use of complex supporting structures and vehicle models such that the influence of the discrete supports on the transition radiation is not clear. This work aims at studying the influence of accounting for the discrete supports on the transition radiation (inside transition zones) and on the plastic deformation that develops in the supporting structure. To this end, a 1-D model is formulated, consisting of an infinite Euler-Bernoulli beam discretely supported by nonlinear springs and dashpots whose characteristics locally vary in space, interacting with a moving loaded oscillator. The solution is obtained using a time-stepping method (i.e., Newmark-β) for the temporal dimension of the system while the finite element method is used to discretise the spatial dimension. The infinite extent of the system is ensured through a set of non-reflective boundary conditions obtained using the Floquet theory. The model presented here can be used for preliminary designs of transition zones in railway tracks. Given the stiffness dissimilarity, the optimum length of the transition zone and the train’s maximum velocity can be obtained such that the damage in the railway track is minimized.","","en","abstract","","","","","","","","","","Engineering Structures","Dynamics of Structures","","",""
"uuid:45546e36-ced3-46af-9265-2b3f3a7f77f6","http://resolver.tudelft.nl/uuid:45546e36-ced3-46af-9265-2b3f3a7f77f6","Smallholder: an inconvenient label in the adoption of water pumping technologies?","Intriago Zambrano, J.C. (TU Delft Water Resources); van Dijk, Ruben (Student TU Delft); van Beusekom, Martin (aQysta); Diehl, J.C. (TU Delft Design for Sustainability); Ertsen, M.W. (TU Delft Water Resources)","","2020","Use of water pumping technologies (WPTs) to drive pressurized systems in smallholder irrigation schemes is one of the key interventions to secure water, hence to increase yields and to potentially alleviate poverty, as well as to foster local and global good security. Whichever the chosen WPT, smallholders face many decision-making variables when considering them: finances, information, technical performance, ease of use, market characteristics, and even environmental concerns are amongst them. We will present evidence that suggests that the way smallholders deal with those factors cannot be predicted based on mere land size-based classifications that are used in many existing policy studies and actual policies. As there are not many specific studies that focus on understanding the influence that the aforementioned variables, directly and indirectly, have on smallholders’ adoption of WPTs, we conducted field work in three different contexts—Nepal, Indonesia and Malawi—to identify the multidimensional gaps and relations between farmer and technology.
Due to the nature of the study, which comprised several (subjective) variables across a number of contexts and individuals, a triangulation of data collection techniques (e.g. direct observations, semi-structured interviews, surveys) was preferred. The main research method was Q-methodology, an increasingly popular inverted technique of factor analysis that combines the strengths of qualitative and quantitative research. Furthermore, one of its main advantages is that representativeness of the subjectivity does not depend on large samples of respondents but rather on their diversity.
By this process, it became evident that clustering farmers under the “smallholders” label—in line with the traditional farm size-based approach—did not reflect their heterogeneity in the WPTs’ adoption process. As a matter of fact, some smallholders are willing (and able, at times) to make substantial investments in WPTs for agricultural irrigation, thus moving away from the “external support-reliant-farmer” image. In conclusion, smallholder’s behaviour, thus decision making, is highly contextualized and cannot be underpinned by solely and simplistically looking at the holding size.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:2d91b03d-6368-480c-abf5-bec4f5ac41d1","http://resolver.tudelft.nl/uuid:2d91b03d-6368-480c-abf5-bec4f5ac41d1","Experimental study on bed-material transport over entrance sills at longitudinal training walls","van Os, Annemarie (Student TU Delft); Lokin, Lieke (University of Twente; HKV Consultants); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Labeur, R.J. (TU Delft Environmental Fluid Mechanics); Osorio, Ana Luisa (External organisation)","","2020","","Longitudinal training walls; Sills; Sediment transport","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-08-14","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:22f29931-cbdd-4d81-aae9-5a96c37aee51","http://resolver.tudelft.nl/uuid:22f29931-cbdd-4d81-aae9-5a96c37aee51","Structural delineation at the Los Humeros geothermal field, Mexico, by P-wave reflection retrieval from noise","Verdel, Arie (TNO); Boullenger, Boris (TNO); Martins, Joana E. (TU Delft Mathematical Geodesy and Positioning; TNO); Obermann, Anne (ETH Zürich); Toledo, Tania (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences); Jousset, Philippe (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)","","2020","","","en","abstract","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:2d185964-ee58-4385-9e56-076be22220a5","http://resolver.tudelft.nl/uuid:2d185964-ee58-4385-9e56-076be22220a5","3D-S wave velocity model of the Los Humeros geothermal field, Mexico, by ambient-noise tomography","Martins, Joana E. (TU Delft Mathematical Geodesy and Positioning; TNO); Obermann, Anne (ETH Zürich); Verdel, Arie (TNO); Jousset, Philippe (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)","","2020","","","en","abstract","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:8e1e13bc-558f-4429-ac59-2befde4d1e10","http://resolver.tudelft.nl/uuid:8e1e13bc-558f-4429-ac59-2befde4d1e10","The contribution of aviation nox emissions to climate change","Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Dahlmann, K. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","The contribution of aviation to anthropogenic climate change results from CO2 and non-CO2 emissions. Latter comprises emissions of nitrogen oxides, water vapour, and aerosols as well as contrail and contrail-cirrus effects. A series of updates can be noted in recent studies related to the effects of NOx-emissions; the inclusion of two physical processes and an updated radiation calculation (see below). However, in our opinion, two further published methodological shortcomings have not been fully considered which leads to a considerable underestimation of the contribution of aviation’s NOx emissions to climate change. First, methane response calculations implicitly assume steady-state instead of an adequate transient development. Second, most studies determine ozone changes caused by switching off or reducing aviation NOx emissions, instead of calculating aviation contributions to ozone. Such methodological simplifications largely underestimate the contribution of the aviation NOx emissions to climate change by a factor of 6 to 7 and can thereby be considered as flaws. Note that the contribution of an emission to climate change (=""status report"") and the contribution of a change in emissions to climate change (=""mitigation option"") require different calculation methods. While for calculating the contribution of emissions to atmospheric compositions (and hence climate change), to which we are referring here, a clear recommendation was made, the methodological approach for evaluating mitigation measures might still be ambiguous, but should certainly not ignore the results of contribution calculations.","","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:8482718c-c0f4-4296-ae4e-d1aa9a2f12cc","http://resolver.tudelft.nl/uuid:8482718c-c0f4-4296-ae4e-d1aa9a2f12cc","Regional sensitivities of air quality to aviation emissions","Domingos de Azevedo Quadros, F. (TU Delft Aircraft Noise and Climate Effects); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects)","","2020","Emissions from civil aviation traffic degrade air quality, causing human health problems that have been estimated to result in ~16 000 premature deaths per year globally, potentially making the cost to society of the air quality impacts even greater than the cost of the climate impact of these emissions. Previous studies have indicated that aviation emissions in specific areas can have impacts of significantly different intensities due to variations in population density and background atmospheric composition. We use the GEOS-Chem global atmospheric chemistry-transport model to investigate the air quality sensitivity to aviation emissions in different regions of the world by performing simulations with increased emissions on different locations at a time and comparing the resulting changes in human exposure to air pollutants (fine particulate matter and ozone). We evaluate the impacts of both landing and take-off (LTO) and cruise level emissions. The simulations are used to investigate the drivers of the differences in air quality sensitivity to emission location, shedding light to the previously observed indications that European air traffic leads to more premature deaths per mass of emissions than North American air traffic. These regionally varying air quality effects imply that regionally non-uniform regulations, if feasible, might provide efficient strategies of mitigating costs associated with air quality impacts.","aviation; air quality; intercontinental pollution; public health","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:e2c6d61a-b2e7-4410-8c44-bf8e05b934bb","http://resolver.tudelft.nl/uuid:e2c6d61a-b2e7-4410-8c44-bf8e05b934bb","How to efficiently design aircraft with minimum climate impact?","Linke, F. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR); Universität Hamburg); Radhakrishnan, K. (Universität Hamburg); Grewe, V. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Vos, Roelof (TU Delft Flight Performance and Propulsion); Niklaß, Malte (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR); Universität Hamburg); Lührs, B. (Hamburg University of Technology); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Dedoussi, I.C. (TU Delft Aircraft Noise and Climate Effects); Proesmans, P. (TU Delft Flight Performance and Propulsion); Deck, K.T. (TU Delft Aircraft Noise and Climate Effects)","","2020","Given the comparably high impact of aircraft emissions, especially their non-CO2 effects, on climate in the order of 5%, aviation stakeholders are required to act to reduce the warming effects of air traffic. Besides new operational procedures, like e.g. climate-optimized routing, this demands the development of completely new global-warming optimized aircraft by aircraft manufacturers. The European Clean Sky 2 project ""Global-Warming Optimized Aircraft Design"" (GLOWOPT) aims at providing aircraft designers an innovative tool to perform aircraft design studies for minimum climate impact, which we call Climate Functions for Aircraft Design (CFAD). The CFAD will substantially change the way aircraft are designed, while maintaining compatibility to existing Multidisciplinary Design Optimization (MDO) methods. The functions need to integrate a lot of information on the typical aircraft usage, including the routes the aircraft will be operated on. This is because, besides the amount of emissions, the impact of aviation non-CO2 effects, such as NOx, H2O as well as contrails, on climate is highly dependent on location (i.e. latitude, longitude) and altitude. So, the representative operating profile of the aircraft needs to be considered in a characteristic route and fleet model. This work will present the interdisciplinary GLOWOPT approach, which comprises expertise on aircraft design, operations, atmospheric physics and climate. Conceptual thoughts on how the complexity of the operating profile in combination with the geographically variable climate impact of aircraft emissions will be reduced such that it can be used in an aircraft design process are given.","Aircraft design; Climate impact; Non-CO2 effects; Climate function; CFAD","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:576d7739-02ec-4079-b6da-d3dbf638792f","http://resolver.tudelft.nl/uuid:576d7739-02ec-4079-b6da-d3dbf638792f","Concept of climate-charged airspace areas","Niklaß, Malte (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Gollnick, V (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR); Hamburg University of Technology)","","2020","Approximately two third of aviation’s climate impact is caused by non-CO2 effects, like the production of ozone and the formation of contrail-cirrus clouds, which can be effectively prevented by re-routing flights around highly climate-sensitive areas. Although climate-optimized re-routing results in slightly longer flight times, increased fuel consumption and higher operating costs, it is up to 60% more climate-friendly. However, if mitigation efforts are associated with a direct increase in costs, this immediately raises the question of the willingness of primarily profit-oriented airlines to act in a more climate-friendly manner and the passengers´ willingness to pay for environmental protection. In order to create an incentive for climate-optimized flying, a climate charge is imposed on airlines when operating in these areas. If climate-charged airspaces (CCAs) are (partly) bypassed, both climate impact and operating costs of a flight can be reduced: a more climate-friendly routing becomes economically attractive (explanation video). By implementing the precautionary and polluter-pays principles of environmental economics, the concept introduces key requirements of a sustainable development into the field of aviation. The proposed extension of the accounting system clearly reduces the discrepancy between the marginal costs estimated by the airlines and the consequential costs for society. Accordingly, this resolves the trade-off between economic viability and environmental compatibility and creates a financial incentive for climate mitigation. The feasibility of this concept is demonstrated on a small route network in the North Atlantic flight corridor (NAFC). If flights are completely re-routed around altered CCAs, on average more than 90 % of the mitigation potential of climate-optimized flying is achieved.","aviation; Non-CO2 Effects; Climate Mitigation; Environmental Policy; Cost-Benefit-Analysis","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:6fb591e7-e3f4-4f9e-bef9-4fb547eb7308","http://resolver.tudelft.nl/uuid:6fb591e7-e3f4-4f9e-bef9-4fb547eb7308","Comparison of various aircraft routing strategies using the air traffic simulation model airtraf 2.0","Yamashita, H. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Yin, F. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Jockel, P. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Kern, Bastian (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Dahlmann, K. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Frömming, C. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","A climate-optimized routing is expected as an operational measure to reduce the climate impact of aviation, whereas this routing causes extra aircraft operating costs. This study performs some air traffic simulations of nine aircraft routing strategies which include the climate-optimized routing, and examines characteristics of those routings. A total of 103 trans-Atlantic flights of an Airbus A330 is simulated for five weather types in winter and for three types in summer over the North Atlantic by using the chemistry-climate model EMAC with the air traffic simulation submodel AirTraf. For every weather type, the climate-optimized routing shows the minimum climate impact, whereas a trade-off exists between the costs and the climate impact. The cost-optimized routing lies between time- and fuel-optimized routings, and minimizes the costs. The aircraft routing for minimum contrail formation shows the second-lowest climate impact, whereas this routing also causes extra costs.","Climate impact of aviation; Climate-optimized routing; North Atlantic weather patterns","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:9c6795c9-1a5a-4be3-9bad-6ffae5588029","http://resolver.tudelft.nl/uuid:9c6795c9-1a5a-4be3-9bad-6ffae5588029","Assessing the climate impact of formation flights","Dahlmann, K. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Matthes, Sigrun (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Yamashita, H. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Unterstrasser, S. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Marks, Tobias (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","An operational measure to aim for mitigation of aviation climate impact that is inspired by migrant birds is to fly in aerodynamic formation. This operational measure adapted to human aircraft would eventually save fuel and is, therefore, expected to reduce the climate impact of aviation. As this method changes beside the total emission also the location of emission it is necessary to assess its climate impact with a climate response model to assure a benefit for climate. Therefore, the climate response model AirClim was adopted to account for saturation effects occurring for formation flight. The results for case studies comprising typical air traffic scenario show that on average the fuel consumption can be decreased by 5%, the climate impact, however, can be reduced by up to 24%.","climate impact; formation flight; mitigation potential; aircraft wake-surfing for efficiency","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:e97a1526-8757-4eb5-a983-40278416d4c1","http://resolver.tudelft.nl/uuid:e97a1526-8757-4eb5-a983-40278416d4c1","Impact on contrails coverage when flying with hybrid electric aircraft","Yin, F. (TU Delft Aircraft Noise and Climate Effects); Grewe, V. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Gierens, K. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","iation is responsible for approximately 5% of global warming and is expected to increase substantially in the future. In the face of the continuing expansion of air traffic, mitigation of the aviation’s climate impact becomes challenging, but imperative. Among various mitigation options, hybrid electric aircraft (HEA) has drawn intensive attention due to its large potential in reducing the greenhouse gas emissions. The non-CO2 effects (especially the contrails) of the HEA on the climate change, however, remains ambiguous. As the first step to understand the climate impact of HEA, this research aims to investigate the impact on the formation of persistent contrails when flying with HEA. The simulation is performed using the Earth System model (EMAC) coupled with a CONTRAIL submodel, where the Schmidt Appleman Criterion (SAC) is adapted to estimate changes in the potential contrail coverage (PCC) globally. The analysis shows that the HEA forms contrails at relatively lower temperature than conventional aircraft. At the same altitude, the reduction in contrails formation is mainly observed in the tropical regions where the temperature is warmer. With a smaller fraction of electric power in use, the contrail coverage remains nearly unchanged. As the degree of hybridization increases further to 90%, an exponential reduction in the contrail formation is expected with a maximum value of about 40%.","Contrail formation; hybrid electric aircraft; degrees of hybridization; seasonal effects; regional effects","en","abstract","","","","","","","","","","","Aircraft Noise and Climate Effects","","",""
"uuid:998a1f07-a821-4501-8879-5e66ff8bee03","http://resolver.tudelft.nl/uuid:998a1f07-a821-4501-8879-5e66ff8bee03","The climate impact of hypersonic transport","Emmerig, J. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Jockel, P. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2020","Supersonic transport was the subject of intense debate in the 1970s and commercial operation was eventually abandoned until recently due to economic and environmental concerns. Flight emissions at stratospheric altitude differ from tropospheric emissions mainly in terms of longevity. Long lifetimes of chemically reactive emissions, especially in the presence of the stratospheric ozone layer, require a detailed investigation of the long-term impact of emissions at this altitude.
Recent studies show a faster degradation of stratospheric water vapor with increasing altitude, driven by photolysis and chemical reaction with O1D. This is seen as an opportunity for civil hypersonic transport. However, the climate impact of hypersonic flight has not yet been investigated.
This is why our study focuses on the emissions of hydrogen-powered hypersonic aircraft fleets (H2O, NOx, H2) in the middle and upper stratosphere (27 and 36 km). Three different scenarios based on the HIKARI emission data allow an altitude dependent comparison of hypersonic emissions. The scenarios were simulated with ECHAM5/MESSy (v2.54.0), including a newly developed submodel H2OEMIS to integrate external water vapor emissions into the cycle of specific humidity.
Additional simulations using different models for comparison are planned with Didier Hauglustaine (LSCE) in the context of project 'Stratofly' funded by EU-Horizon 2020.
subject to the fluid source as well as the material properties, e.g., porosity and fluid mobility, which affect the speed and distribution of the stress build-up on the fault and thus the pattern of rupture nucleation. In addition, we implemented a predefined pressure profile to simulate the induced rupture in case of a uniform depletion of the reservoir to allow for a comparison with other studies. The results
provide useful insights on the causality between reservoir-pressure behaviour and the induced seismicity.","induced earthquakes; finite element method; poroelasticity; dynamic rupture; Defmod","en","abstract","","","","","","Accepted Author Manuscript","","2021-02-26","","","Applied Geophysics and Petrophysics","","",""
"uuid:be167d1e-819c-4ca3-985e-17bd7e4d5522","http://resolver.tudelft.nl/uuid:be167d1e-819c-4ca3-985e-17bd7e4d5522","DESHIMA: Integrated Superconducting Spectrometer for Wideband Submillimeter Astronomy","Endo, A. (TU Delft Tera-Hertz Sensing)","","2020","The integrated superconducting spectrometer (ISS) enables ultra-wideband, large field-of-view integral-field-spectrometer designs for mm-submm wave astronomy. DESHIMA (Deep Spectroscopic High-redshift Mapper) is a single-pixel ISS spectrometer for the ASTE 10-m telescope, designed to observe the 220-440 GHz band in a single shot, corresponding to a [CII]-line redshift range of z=3.3-7.6.In this colloquium I will present the instrument concept, design, and first on-sky results of DESHIMA, obtained from October to December 2017 on the ASTE telescope. On the ISS chip of DESHIMA, the signal is captured by a lens-antenna and subsequently travels through a coplanar waveguide made of superconducting NbTiN, from which NbTiN bandpass filters branch out to divide the signal into separate frequency channels. At the output of each filter is a NbTiN/Al hybrid microwave kinetic inductance detector (MKID). The first generation of DESHIMA (DESHIMA 1.0) is a 1-pixel spectrometer that covers the 332-377 GHz band with 49 spectral channels, offering a spectral resolution F/dF ~ 380. We present detection of molecular emission lines from various sources, including a weakly redshifted CO line from the luminous infrared galaxy VV 114. The on-sky performance shows excellent agreement between the design and laboratory measurement in terms of the sensitivity, optical efficiency and beam pattern. In addition, we present wideband spectral maps of extended sources to demonstrate the potential of the ISS technology towards spectroscopic direct imaging. Ongoing upgrades towards the octave-bandwidth full system (DESHIMA 2.0) include the development of a filterbank chip with ~350 channels and higher optical efficiency, a wideband quasioptical design, and observing methods for efficiently removing the atmosphere. DESHIMA is a collaboration between the Netherlands (TU Delft, SRON, Leiden University, +) and Japan (University of Tokyo, Nagoya University, Kitami Institute of Technology, NAOJ, +)
Reference
Endo et al., ""First light demonstration of the integrated superconducting spectrometer,"" Nature Astronomy 3, 989-996 (2019) https://arxiv.org/abs/1906.10216
DESHIMA website: http://deshima.ewi.tudelft.nl
In this study, we investigate how gravity affect foam in fractures. To this end, we have conducted several sets of foam-scan experiments (i.e., a set of constant-total-velocity experiments each with a different gas fractional flow) on three glass model fractures (model A, model B and model C) with hydraulic aperture of 78, 99 and 128 µm respectively.
The models have the same dimensions of 1 m x 0.15 m (L x W) and the same fracture roughness pattern. The transparency of glass models allows a direct investigation of foam texture inside the fracture using a high-speed camera. All experiments have been carried out at 20°C and 1 atm. Nitrogen is the gas phase, and surfactant solution is 1 wt % AOS C14-16.
Experiments were carried out on all three models by placing the model either horizontally or on its side. Stable foam was created and reached local equilibrium in all horizontal-flow experiments, i.e., the rate of foam lamella creation was equal to the rate of destruction. The roughened fracture surface provided sufficient generation sites to re-create foam bubbles in sections further from the entry, hence maintaining a stable foam.
In the sideways flow experiment, the effect of gravity on foam stability was not significant when fracture aperture was small (model A). As hydraulic aperture increased (model B and model C), the effect of gravity was more pronounced. Drier foam propagated along the top part of the fractures and wetter foam along the bottom. Gas saturation was 23% greater at the top than the bottom for model B, and 34% for model C. Foam was still stable during the sideways flow experiments in model B. However, foam breakage alternated with re-generation near the top in model C.
We conclude that the application of foam in vertical natural fractures (meters tall and tens of meter long) with a aperture of hundreds of microns is problematic. The gravity segregation of phases for this foam would disable its capacity to divert gas flow from a tall fracture like our model into the matrix. As a result, there will be a gas-rich regime at the top of the fracture and a liquid-rich regime at the bottom. The regimes segregate more as the aperture increases.
Strong foam can reduce gas mobility by a factor of hundreds, by trapping gas and reducing its relative permeability in situ[1]. To efficiently improve the sweep, foam needs to propagate and maintain its strength at locations further away from the injection well. Foam trapping and propagation are highly dependent on porous media geometry, injection rate, foam quality, etc.
Microfluidic system, a medium integrating flow channels of manipulated structures on the order of tens to hundreds of microns, have been increasingly attractive to oil and gas, chemical and pharmaceutical industries[2]. Microfluidics are also becoming one of the most stimulating research field in foam EOR, because it provides the opportunities to visualize foam behaviour directly, such as foam generation, propagation and foam coarsening[3], etc.
We employ a model similar to microfluidics, directly applicable to flow in geological fractures. The 1-meter-long model represents a fracture channel with one roughened and one smooth wall. It has a width of 15 centimeters and a hydraulic aperture of 128 µm. The model is made of glass plates, therefore enabling direct investigation of foam behaviour through the channel using a high-speed camera. Since roughened glass is available with a range of roughness scales[4], one can relate foam behaviour to the roughness pattern in the channel.
We conduct a series of foam experiments in the model. Local equilibrium of foam (i.e. the rate of bubble generation equals to that of bubble destruction) is reached within our long model. We study the dynamics of gas trapping at different velocities and gas fractional flows.
We observe that velocity affects the fraction of gas which is trapped in the model at low foam qualities. Gas trapping decreases and foam mobility increases as superficial velocity increases. At high foam qualities, the relation between trapped gas and foam mobility is weaker. Gas trapping is insignificant and has little effect on foam mobility. When gas fractional flow increases at high foam qualities, flow alternates between slugs of gas and foam.
safety analysis to calculate the Factor of Safety (FoS). Results of idealised analysis show that the Leaf Area Index (LAI) is coupled to the moisture in the root zone with a time lag, therefore, it is likely that it could be used as an indicator of safety. This proof-of-concept study enables dike managers to use the mentioned parameters as a proxy to identify vulnerable locations along a dike even in an early stage due to the lag correlation. This offers the opportunity to use remote sensing rather than physical inspection or installing sensors, along with history matching, to initially identify vulnerable locations along dikes.","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:4ebcb0ef-4d71-4aae-88ed-ac8a0bdd465a","http://resolver.tudelft.nl/uuid:4ebcb0ef-4d71-4aae-88ed-ac8a0bdd465a","New mass-lumped tetrahedral elements for 3D wave propagation modelling","Geevers, S. (University of Twente); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics; Shell); van der Vegt, J (University of Twente)","","2019","We present a new accuracy condition for constructing mass-lumped elements. This condition is less restrictive than the one previously used and enabled us to construct new mass-lumped tetrahedral elements for 3D wave propagation modelling. The new degree-2 and degree-3 elements require significantly fewer nodes than previous versions and mass-lumped tetrahedral elements of higher degree had not been found before. We also present a new accuracy condition for evaluating the stiffness matrix-vector product. This enabled us to obtain tailored quadrature rules for the new elements that further reduce the computational cost.","mass lumping; tetrahedral element; spectral element; wave equation","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:73cef9b5-2896-49ee-9901-fc9f0486c158","http://resolver.tudelft.nl/uuid:73cef9b5-2896-49ee-9901-fc9f0486c158","Developing an energy satellite for an MRIO virtual laboratory","Lam, K.L. (TU Delft Sanitary Engineering); Daniels, Peter (Griffith University)","","2019","","","en","abstract","","","","","","","","","","","Sanitary Engineering","","",""
"uuid:572215ac-fd17-45c3-8216-b6d4806b854d","http://resolver.tudelft.nl/uuid:572215ac-fd17-45c3-8216-b6d4806b854d","Online misinformation as a designed user experience","Marin, L. (TU Delft Ethics & Philosophy of Technology)","","2019","The ongoing flood of misinformation in online social media is a pervasive feature of digital communications. However, the current conceptualisations of misinformation are not nuanced enough to deal with the online medium by treating online misinformation as the same species of offline misinformation. Because of this lack of differentiation between kinds of misinformation, we are missing out on a chance to clarify what is the epistemic role of the technological medium in turning information or misinformation into belief. This presentation consists of two parts: the first part criticises the classical approaches to online misinformation which are based on the semantic view of information as ""well-formed meaningful data"" (Floridi, 2010). Following this perspective, misinformation would be just false meaningful data. Since the truth and falsity of the data does not hinge on the medium as such, this approach to misinformation in not robust enough to differentiate between examples of online from offline misinformation. I will show several shortcomings of this approach illustrating with some cases of online misinformation. In the second part of the presentation, I will propose a new conceptualisation of misinformation as the experience of unfounded belief which is promoted by certain informational environments, and show that this particular experience can be designed alongside other types of user experience; I will show examples of how certain user interface design choices prime their users for seeking and propagating misinformation. By shifting the attention from the semantic content of the information to the design features of the online informational environment, this presentation proposes to shift the weight from the epistemic concept of misifnormation to an approach more based on philosophy of technology and mediation theory.","","en","abstract","","","","","","","","","","","Ethics & Philosophy of Technology","","",""
"uuid:5eb81346-22d2-43ad-9c97-8b3f726a78b2","http://resolver.tudelft.nl/uuid:5eb81346-22d2-43ad-9c97-8b3f726a78b2","(Co)Algebraic Techniques for Markov Decision Processes","Hansen, H.H. (TU Delft Energie and Industrie); Feys, F.M.V. (TU Delft Energie and Industrie); Moss, Lawrence S. (Indiana University - Purdue University)","","2019","","","en","abstract","","","","","","","","","","","Energie and Industrie","","",""
"uuid:a4458714-78b2-4cf1-a18e-6bf859eed8b7","http://resolver.tudelft.nl/uuid:a4458714-78b2-4cf1-a18e-6bf859eed8b7","A (Co)algebraic Approach to Hennessy-Milner Theorems for Weakly Expressive Logics","Hansen, H.H. (TU Delft Energie and Industrie); Bakhtiari, Zeinab (Lorraine University); Kurz, A (Chapman University)","","2019","","","en","abstract","","","","","","","","","","","Energie and Industrie","","",""
"uuid:847e6127-cf5d-4a52-b4a9-4d3bb7bdbaf8","http://resolver.tudelft.nl/uuid:847e6127-cf5d-4a52-b4a9-4d3bb7bdbaf8","Online misinformation as a problem of embodied cognition","Marin, L. (TU Delft Ethics & Philosophy of Technology)","","2019","This paper argues that the creation and propagation of misinformation in online environments, particularly in social media, is confronted with specific challenges which are not to be found in offline communication. Starting from the widely accepted definition of misinformation as 'deliberate production and distribution of misleading information' (Floridi, 2013) which we designate as the semantic view of misinformation, we aim to provide a different definition of misinformation based primarily on the pragmatics of communication and on the role of the technological environment. While misinformation in online environments is also false and misleading, its main characteristic is the truncated way in which it is perceived and re-interpreted and, we will argue, this way of processing information belongs foremost to the online environment as such rather than to a defective way of information-processing from the side of the epistemic agent. From this pragmatic perspective, sometimes misinformation is true information which is interpreted and propagated in a biased way. One of the major features of the online environments which makes it for a medium prone to mis-interpretation and bias concerns a way of leading to impoverished sensory information processing. Assuming an embodied cognition view – in its compatibilist version, see (Varela et al., 1991; Clark, 1997) - then the environment in which we exercise our cognitive abilities has a deciding role for our ability to function as epistemic agents because through our bodies and we acquire cognitive states dependent on the environment to which our bodies are exposed. Following this embodied cognition assumption, then the online environment presents itself as a challenge through the ways in which it prioritises certain senses while obliterating others: the visual senses are primordial to the detriment of other senses such as touch, smell, and even hearing; moreover, we interact with others in online environments through text messages which favor explicit meanings while tacit communication and other pragmatic aspects of communication relying on body-language and non-verbal signs are lost.
This presentation will describe the constellation of aspects which characterise the pragmatics of communication in online environments and then show why this kind of communicational situation is biased leading to what we will call an 'incomplete pragmatics' of communication. In online environments, we will argue, misunderstandings are the rule and not the exception, because of the dis-embodied and text-biased forms of communication. We will illustrate our theory of incomplete pragmatics of online communication with several case studies of online misinformation based on factually true information which is systematically misunderstood.
References
Clark, A. (1997). Being There: Putting Brain Body and World Together Again. Cambridge, MA: MIT Press. Clark, A. and Chalmers, D. (1998). The extended mind. Analysis, 58, 7-19. Floridi, Luciano. The philosophy of information. OUP Oxford, 2013. Varela, F., Thompson, E., Rosch, E. (1991). The Embodied Mind. Cambridge, MA: MIT Press.","","en","abstract","","","","","","","","","","","Ethics & Philosophy of Technology","","",""
"uuid:c8baa936-fc96-4c0f-a67c-cfaf40111e80","http://resolver.tudelft.nl/uuid:c8baa936-fc96-4c0f-a67c-cfaf40111e80","Single-shot CARS Imaging of Near-Wall Turbulent Reacting Flows","Bohlin, G.A. (TU Delft Flight Performance and Propulsion); El Sioufy, Karim (Student TU Delft); Jainski, C. (Technische Universität Darmstadt); Dreizler, A (Technische Universität Darmstadt); Patterson, B.D. (Sandia National Laboratories, California); Kliewer, C. J. (Sandia National Laboratories, California)","","2019","In practical combustion devices featuring high power densities, the interaction between flames and walls may have a significant impact on the thermodynamic efficiency and the formation of pollutants (e.g. unburned hydrocarbons and carbon monoxide). The common understanding is that at the region near the wall ~ 1 mm, where the solid metal surface is generally much cooler than the impinging flames, steep temperature gradients exist which may result in incomplete combustion and local quenching of the flame. This has been investigated experimentally, by CARS monitoring of temperature- and major species profiles from premixed methane/air flames impinging against a cooled steel side-wall, performed at well-characterized quasi-stationary laminar conditions [1].
In these new experiments, we have employed the same generic burner and CARS imaging system [2], but now operating at significantly enhanced turbulence intensities induced by a turbulence generator grid (blockage ratio 45%, turbulence level 푢푢′/푢푢ത = 6-7%). The complex interplay between the laser diagnostic and the turbulent reacting flow in the near-wall region has been overcome, for instance, with the balanced detection between CARS signals originating from unreacted- and reacted mixtures imaged on the same detector frame, the removal of the laser beams reflecting from the surface, and the suppression of background flame luminosity within the clear aperture of the coherent imaging system. A quick-fitting routine enabling rapid convergence of two-beam femtosecond/picosecond CARS signal analysis has been developed. Correlated statistics have been produced, for instance, on the instantaneous temperature gradients near the wall (position with magnitude). This temperature data supports the recent findings of velocity measurements [3], and adds to the database on this burner system which can be used as a benchmark to improve the fidelity of numerical simulation on near-wall turbulent reacting flows.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:17472c3e-53aa-4f43-a684-4959ca474471","http://resolver.tudelft.nl/uuid:17472c3e-53aa-4f43-a684-4959ca474471","Robust wind farm layout optimization using pseudo-gradients","Quaeghebeur, Erik (TU Delft Wind Energy)","","2019","Wind farms form an ever increasing share of the world’s electricity production capacity. But now that wind energy subsidy schemes are coming to an end, the cost per unit of electricity produced must become structurally lower than the fossil fuel-based power plants society wants replaced. Optimization of the farms’ design [1] is essential to achieving this. So the objective is to minimize the expected cost per unit of electricity. This objective depends on the expectation for the amount of electricity produced and for the farm’s cradle-to-grave costs. We here assume those costs to be fixed, so that the objective becomes maximization of expected electricity production. So we ignore aspects such as cable layout and their impact on the design. Effectively, we consider a fixed number of turbines whose positions can be chosen; this set of positions is called the wind farm layout. However, we must consider the period over which the electricity is produced: The farm lifetime production is important, but so is yearly production, as large inter-year variation poses financial risks. Therefore, we are studying the effect of inter-year variation of the wind resource. A site’s wind resource is represented by the joint probability distribution of wind directions and wind speeds encountered there over time. Specifically, we wish to create optimized layouts that are robust against this inter-year variation. For us—comparing layouts whose profiles of yearly expected production are undominated—, this means that we prefer layouts with a more constant relative performance. We have not fixed a formalization of this robustness concept, but would like to explore imprecise probabilistic options. Calculating the expected power production of a wind farm given a layout and wind resource is computationally expensive, because for each of the many required pairs of wind speed and wind direction a complex wake pattern must be computed. Also, when optimizing, the layout changes each iteration and computationally non-trivial constraints must be satisfied. Of course, considering yearly variation in wind resources yet again multiplies the computational effort required. Even when using simplified wake models runs, our robustness study would be practically infeasible using the classical optimization algorithms [2]. Therefore, we have designed a more efficient optimization approach. It (i) takes downwind, crosswind, and inter-turbine unit vectors, (ii) multiplies these by the power deficits caused by the wakes, and (iii) takes the expectation over the wind resource to create pseudo-gradients, to be used instead of real gradients. It has been shown to be competitive with other approaches in terms of optimal objective value, but substantially faster. We have used pseudo-gradient-based optimization to perform layout optimizations for a realistic site and for a set of wind resources that consists of 35 yearly ones, their average, one with a uniform wind resource, and one with just a single wind direction. Moreover, because wind resource normalization is not needed for the derivation of pseudo-gradients, we also considered the lower and upper envelopes of the 35 yearly wind resources as optimizer inputs. Some conclusions: (i) Inter-year wind resource variation is substantial, i.e., about half the probability mass shifts around. (ii) For the different layouts generated by our algorithm, the inter-year production differences for one layout are larger than differences between different layouts for one single year. (iii) The set of layouts with undominated production profiles is relatively small, mainly due to the fact that relative performance of layouts is mostly stable over the years. (iii) Among these, there exist robust layouts as we defined them, but in a trivial sense, as they are more optimal in general over all yearly wind resources considered. (iv) Therefore, there is no real trade-off achieved yet between robustness and optimality. Further investigation is warranted to determine (i) the impact of the optimization algorithm and its parameter settings, as the results appear to depend chaotically on these settings and (ii) the relevance of optimizing for a specific wind resource.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:99703d6e-a33b-48ce-9812-757cc21c64e8","http://resolver.tudelft.nl/uuid:99703d6e-a33b-48ce-9812-757cc21c64e8","Flexible and efficient site constraint handling for wind farm layout optimization","Quaeghebeur, Erik (TU Delft Wind Energy)","","2019","Wind farm sites can have complex, disconnected shapes and may encompass exclusion zones. Even offshore this is the case, due to sea lanes, underwater pipelines and cables, wrecks, and unidentified buried objects. An example is Borssele Wind Farm Site IV1 (BWFS IV), which is pictured in Figure 11 as the collection of greencolored parcels. Within BWFS IV, as shown in Figure 21, there is an archaeologically significant wreck—red boat—and multiple magnetic anomalies— green dots—that indicate buried objects. Furthermore, regulations require turbines to be placed a certain safety distance—one rotor radius— inside the parcels.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:351f44c4-bbc6-4624-8ced-7aa3c4dd787c","http://resolver.tudelft.nl/uuid:351f44c4-bbc6-4624-8ced-7aa3c4dd787c","Dynamic simulation of masonry materials at different loading velocities using an updated damage delay algorithm of regularization: theory and practical applications","li Piani, T. (TU Delft Applied Mechanics); Weerheijm, J. (TU Delft Applied Mechanics; TNO); Sluys, Lambertus J. (TU Delft Materials- Mechanics- Management & Design)","","2019","Buildings and structures in many cities have recently been exposed to an increased number of highly dynamic hazards. These include not only floods and earthquakes but also man made threats such as ballistic impacts and blasts. Thus, the assessment of the dynamic performance of structures made of quasi-brittle materials must account also for high strain rate loadings. In engineering software, numerical simulations of dynamic failure processes are often carried out in a framework of damage mechanics, in which failure is interpreted as a degradation of the elastic material capacity. However, for many damage models, the link between the implemented numerical functions representing the corresponding physical mechanisms aimed is still a controversial issue. This is also the case because damage models suffer from a numerical pathology which prevents the objective evaluation of failure for different spatial discretization. To solve this issue, non local regularization algorithms are often used to solve mesh dependence, often at the expenses of complex identification procedures and non- trivial code implementation. Instead, a locally regularized rate dependent model has been developed by the authors for the static assessment of unbaked masonry materials made of clay sand and silt [1]. It adapts damage delay functions originally proposed in [2] in a local damage model developed for cementitious materials [3] based on the decomposition of the Dirichlet boundary conditions solved with an implicit solver. The regularization properties of the model were shown in [1] in statics. The regularization properties of the algorithm are analysed in this contribution for the dynamic problem of a bar uniaxially compressed at high velocity deformation rates. Furthermore, the physical background of the delay formulation is interpreted in light of the main failure processes commonly depicted for quasi-brittle materials in dynamic tests. In particular, the material parameters of the delay function in [1] are linked in this study to the bridging processes of micro-cracks starting from initial flaws inside the material and the resulting macro-crack development up to failure. Considering the physics shown in literature for quasi-brittle materials under multi-strain rate tests, the constant parameters in [1] are made functions of internal and environmental factors, namely material mineralogical properties and applied loading rates in this study. The resulting delay formulation produces an improvement in the capability of the model both to address the complete stress-strain curve of the response of traditional masonry materials subjected to a dynamic load and the rate of enhancement of the main mechanical parameters typical for these rate sensitive materials when subjected to multi-strain rates tests. This is shown in this paper by means of theoretical tests and practical applications with regards to the results of an experimental campaign performed by the authors on adobe specimens subjected to dynamic tests at three different strain rates, ranging from statics to Split Hopkinson bar tests.","","en","abstract","","","","","","","","","","Materials- Mechanics- Management & Design","Applied Mechanics","","",""
"uuid:cc565b67-87cc-40ea-ab30-4300b63f3711","http://resolver.tudelft.nl/uuid:cc565b67-87cc-40ea-ab30-4300b63f3711","Housing Justice with the Capability Approach","Kimhur, Boram (TU Delft Urban Development Management)","","2019","The paper explores an idea for framing housing justice with the capability approach, and how the housing justice framework can guide for the inequality reduction in housing. The changes in the world – such as the growth of wealth inequality, housing financialisation, and the rise of the precariat – indicate that the traditional welfare state models and housing policy directions need to be redesigned. The factors creating inequality in housing are no longer confined to the boundary of a ‘state’. This demands us to reexamine the nation-state-based discourse on inequality. There is a growing consensus that a correction is urgently needed, but debates on guiding principles seem absent. The paper aims to open a debate about this topic and suggests that the housing justice framework with the capability approach can play a role as a guide. Three essential subjects of theories of justice are specified to form a base of the idea for housing justice: (a) the characterisation of ideal institutions; (b) metrics of justice (i.e. capabilities); and (c) distributive pattern rules. The paper concludes that the realisation-focused comparative approach to housing justice is plausible in contrast to the approach that primarily focuses on defining ideal institutions. Housing capabilities need to be compared, and the paper suggests three sub-spaces of the housing capabilities metric to make its concept more workable: opportunities, securities and abilities. The scope of housing justice should not be confined to the distribution of holdings – such as adequate housing – and the notion of redistribution of the welfare states. It concludes that the primary task is to monitor to what extent a housing policy is enhancing capabilities of individuals – real housing opportunities to enjoy, rather than to merely monitor whether a policy has reached the perfectly just distributive rule or threshold. Based on the ideas proposed, the paper draws implications for the role of housing research, particularly comparative housing research, in advancing housing justice in society.","Housing policy; justice; inequality; capability approach","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:cc55e566-3e15-4260-91e0-a037024792a5","http://resolver.tudelft.nl/uuid:cc55e566-3e15-4260-91e0-a037024792a5","DARE-TU Project: Co-creation of Affordable and Clean Pumped Irrigation for Smallholders","Intriago Zambrano, J.C. (TU Delft Water Resources); Michavila, Jaime (aQysta); Arenas, Eva (Comillas Pontifical University); Diehl, J.C. (TU Delft Design for Sustainability); Ertsen, M.W. (TU Delft Water Resources)","","2019","","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Water Resources","","",""
"uuid:3179a73b-f698-4c78-b432-32fa3f8da6ce","http://resolver.tudelft.nl/uuid:3179a73b-f698-4c78-b432-32fa3f8da6ce","A review of reports from Dutch organisations on how to reduce residents’ energy use and choices for sustainable technologies at home","Sanders, F.C. (TU Delft Environmental Technology and Design; University of Twente); Overtoom, M.E. (TU Delft Indoor Environment; University of Surrey)","","2019","","","en","abstract","","","","","","","","","","","Environmental Technology and Design","","",""
"uuid:2f2802ad-6071-414b-bb49-bdc5cc171f53","http://resolver.tudelft.nl/uuid:2f2802ad-6071-414b-bb49-bdc5cc171f53","Preliminary analysis of the ionosphere-corrected PPP-RTK user performance.","Psychas, D.V. (TU Delft Mathematical Geodesy and Positioning; Fugro); Verhagen, S. (TU Delft Mathematical Geodesy and Positioning); Liu, Xianglin (Fugro Intersite B.V.)","","2019","","","en","abstract","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:db2b9c15-256e-4320-8dea-923906f4ac27","http://resolver.tudelft.nl/uuid:db2b9c15-256e-4320-8dea-923906f4ac27","Carbon accounting for households – a case study of a community’s emissions","Malik, Arunima (University of Sydney); Lenzen, Manfred (University of Sydney); Lane, Joe (University of Queensland); Lam, K.L. (TU Delft Sanitary Engineering); Geschke, Arne (University of Sydney)","","2019","","","en","abstract","","","","","","","","","","","Sanitary Engineering","","",""
"uuid:4a39f77a-b0db-44d0-a725-f61693547e10","http://resolver.tudelft.nl/uuid:4a39f77a-b0db-44d0-a725-f61693547e10","Drift, Naturally: A Transaffective Unfolding","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2019","","Structural Coupling; Technicity; Individuation; Ethology; Epiphylogenetics","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:44e54716-6f76-45d9-97ce-01478f4d4cf5","http://resolver.tudelft.nl/uuid:44e54716-6f76-45d9-97ce-01478f4d4cf5","Communal Space and Degree of Sharing: The Legacy and Inspiration of Juer Hutong Neighborhood Project","Sun, Wenwen (TU Delft Theory, Territories & Transitions)","","2019","","Chinese dwelling design; communal space; courtyard housing; new quadrangle; public-private gradient; urban regeneration design","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:3d012056-d59b-4d34-8903-bca527acd393","http://resolver.tudelft.nl/uuid:3d012056-d59b-4d34-8903-bca527acd393","Flight Testing, Aerodynamic Parameter Identification and Dynamic Simulation of Rigid and Flexible Kites Applied to Airborne Wind Energy systems","Borobia-Moreno, R. (Carlos III University of Madrid; Spanish National Institute of Aerospace Technology (INTA)); Ramiro-Rebollo, D. (Carlos III University of Madrid); Sanchez Arriaga, Gonzalo (Carlos III University of Madrid); Schmehl, R. (TU Delft Wind Energy)","","2019","Simulation, state estimation, and aerodynamic parameter identification from in-flight data are actual research topics in AWE [1,2]. This work summarizes the status of four infrastructures developed at Universidad Carlos III de Madrid that are related with them: (i) a portable experimental rig for the acquisition of flight data like kite position, velocity, Euler angles, angular velocity, aerodynamic speed, angle of attack and sideslip angles, tether tensions, and wind velocity, (ii) an estimator of the state of the system, including the aerodynamic force and torque (iii) an optimization algorithm to compute the aerodynamic parameters from the estimated state variables, and (iv) the open-source simulator LAKSA, that contains modules aimed at the dynamic simulation and control of fly-gen and ground-gen generation systems, 2- line acrobatic kites, four-line kitesurf kites, and a train of N stacked kites.","","en","abstract","","","","","","green","","","","","Wind Energy","","",""
"uuid:e1bb3595-17ba-4052-8990-19373d115832","http://resolver.tudelft.nl/uuid:e1bb3595-17ba-4052-8990-19373d115832","Steady-State Solver for a Ram-Air Kite Aeroelastic Model Based on Dynamic Relaxation","Thedens, P. (TU Delft Wind Energy; SkySails Power); Bungart, Merlin (SkySails Power); Schmehl, R. (TU Delft Wind Energy)","","2019","We present a computationally efficient steady-state solution method to model the aeroelastic deformation of a ram-air kite for airborne wind energy applications. The kite’s weight in comparison to the aerodynamic forces is small which justifies a quasi-steady analysis, neglecting gravitational and inertial force effects [1]. The approach is suitable to efficiently determine the deformed configuration of a ram-air kite for design and optimization purposes as found in [2]. Because of the expected large deformations and changes in the flow field, fluid-structure interaction has to be taken into account in the analysis.","Airborne Wind Energy; Glasgow","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:0951fbaa-3dbe-4fec-885f-8bddbabf6fc6","http://resolver.tudelft.nl/uuid:0951fbaa-3dbe-4fec-885f-8bddbabf6fc6","Development of a Toolchain for Aero-structural Design of Composite AWE Kites","Candade, A.A. (TU Delft Wind Energy; EnerKíte); Ranneberg, M. (EnerKíte); Schmehl, R. (TU Delft Wind Energy)","","2019","The earlier in the design process the trade-offs between a system’s cost and its performance can be determined, the easier it is to narrowin on an optimal final design. In order to explore the initial design space for composite carbon kites, it is imperative to assess the load couplings effects and its impact on the aerodynamics of the wing, and ultimately the performance of the system’s yield. CFD and 3D finite element methods are currently too computationally expensive to efficiently explore the design space at such an early stage of the design process. This leads to the need for a toolchain that has sufficient modelling fidelity while being efficient enough to be used for conceptual design. An efficient aero-structural toolchain is the focus of this work.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:df170810-3cba-4559-afce-a41b7c181da0","http://resolver.tudelft.nl/uuid:df170810-3cba-4559-afce-a41b7c181da0","EnerKíte - Latest Achievements Towards Next Generation Renewables","Bormann, Alexander (EnerKíte); Vollmer, Claus (EnerKíte); Skutnik, Stefan (EnerKíte); Gebhardt, Christian (EnerKíte); Candade, A.A. (TU Delft Wind Energy; EnerKíte)","","2019","The EnerKíte team has been successful in automation of kite systems for more than a decade. Our first autonomous kite flights with figure of eight patterns took place in May 2008. Since then the technology of the ground-station, the wing and tether and the landing and launching systemhas been systematically developed, implemented and improved ś driven by cost, performance and safety targets derived and approved by customers.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:5fc95147-d21c-4e5f-9520-1cb9e75bb2c4","http://resolver.tudelft.nl/uuid:5fc95147-d21c-4e5f-9520-1cb9e75bb2c4","Small-scale-induced anisotropy of a 3D subsurface model: quantitative analysis and numerical simulations of waves within","Cupillard, Paul (Lorraine University); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics; Shell Global Solutions International B.V.); Irakarama, Modeste (Lorraine University); Mazuyer, Antoine (Lorraine University; Stanford University); Anquez, Pierre (Lorraine University)","","2019","Within the last decade, non-periodic homogenization proved to be an accurate upscaling method for computing smooth equivalent media of elastic models of the earth interior. Doing so, it reveals the seismic anisotropy induced by small-scale structures and it eases the numerical simulation of wave propagation in complex geological settings by preventing from the use of fine and complex meshes or grids, provided that wave simulators can take anisotropy into account. In the present work, we investigate the small-scale-induced anisotropy of a typical subsurface model, namely the SEG-EAGE overthrust, for a fmax = 10Hz wavefield. We find that the amount of anisotropy can reach 20% locally and that orthorhombic anisotropy can be a poor approximation in some areas, suggesting that the analysis of datasets in terms of orthorhomby may be not relevant. However, while low-symmetry classes of anisotropy are naturally handled by the spectral-element method (SEM), they challenge the finite-difference method (FDM) in terms of implementation and computation cost. To estimate the benefit of using homogenized media in either SEM or FDM codes, we perform numerical simulations in both the initial overthrust model and its smooth version, using either regular SEM meshes or FDM grids of different resolution. We compare the obtained waveforms with a reference solution, which allows us to study the accuracy of the simulations as a function of the computation cost for both the SEM and the FDM.","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:fdfcf76b-421a-44a2-b01f-f229dc3ed57e","http://resolver.tudelft.nl/uuid:fdfcf76b-421a-44a2-b01f-f229dc3ed57e","Negotiated Public: An Investigation on the Streetscape of Beijing’s Old City","Sun, Wenwen (TU Delft Theory, Territories & Transitions)","","2019","In Beijing’s old city, the emergence of conflictual practices in the street life have challenged the conventional concepts of ‘public’ and ‘private’, as well as the design principles based on this normative expression. This paper proposes a novel way of reading and understanding the street spaces by exploring a traditional type of street in Beijing— namely the hutong — through its controversial and conflicting spatial practices and ambiguous social expressions. Substantiated by the practice of lived experience, it argues that instead of a given urban condition or an idealised category of urban design, public space is best understood as a dynamic realm negotiated and renegotiated by simultaneous solid and soft interventions from multiple social groups. This argument hopes to open discussions towards a more localised and inclusive understanding of public space in the Chinese city.","appropriation; negotiation; public space; the streetscape","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:96fa470a-2de5-4a02-b939-8086614d232f","http://resolver.tudelft.nl/uuid:96fa470a-2de5-4a02-b939-8086614d232f","Towards an Active Graphene-PDMS Implant","Wardhana, Gandhika K (Student TU Delft); Serdijn, W.A. (TU Delft Bio-Electronics); Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM); Vollebregt, Sten (TU Delft Electronic Components, Technology and Materials)","","2019","Neural interface in the form of microelectrodes are used to monitor and treat spinal cord injury and other neurological disorders by the means of recording and stimulation. Despite of the apparent result of these electrical interventions, understanding of the mechanism behind neural stimulation is still inadequate. The use of optical monitoring during implantation is limited due to the use of opaque electrode partially blocking the implantation site. While the use of transparent conductor for electrode is not uncommon in general electronics where indium tin oxide (ITO) is widely used for displays, however ITO is not suitable for implantation due to its brittle nature[1]. An alternative material to fabricate transparent electrodes is graphene, a single layer of carbon atom forming sp2 hybridization. Its high charge mobility, flexibility, mechanical strength and optical transparency make it suitable for various flexible electronics applications including implantable microelectrode arrays. In biomedical fields, graphene has shown potential application as biosensor, stimulation and recording electrode[2]. Although fabrication of graphene microelectrodes has been previously shown[3], graphene had to be transferred manually for each individual implant. The high temperature needed during graphene deposition makes device fabrication directly on the flexible material impossible. Instead, the fabrication process relies on a transferring process of graphene layer from growing medium with high thermal budget to another desired substrate. Manual transfer process of graphene is a skill-dependant process with low scalability. In this work, a method of fabricating encapsulated graphene electrodes in polydimethylsiloxane (PDMS) with a controlled wafer-scale graphene transfer is proposed. Graphene transfer is done by wafer-assisted PDMS-PDMS bonding to minimalize operator dependency. The novel use of PDMS as encapsulation material for graphene electrode is due to its biocompatibility, flexibility and optical transmittance. Difference in material characteristics, such as the thermal expansion coefficient has become one of the challenges during fabrication process. Despite of these challenges, the prospect of transparent implant has been shown in preliminary testing on optical transmittance of graphene layer on PDMS with up to 77% transmittance in the visible light spectrum. While full characterization of the device is still in progress, further results will be reported during the conference.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:f207c691-66c4-47f5-8985-02919b8cafe3","http://resolver.tudelft.nl/uuid:f207c691-66c4-47f5-8985-02919b8cafe3","Towards a semi-flexible parylene-based platform technology for active implantable medical devices","Bakhshaee Babaroud, N. (TU Delft Bio-Electronics); Kluba, M.M. (TU Delft Electronic Components, Technology and Materials); Dekker, R. (TU Delft Electronic Components, Technology and Materials); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM)","","2019","Active implantable medical devices have been developed for diagnosis, monitoring and treatment of large variety of neural disorders. Since the mechanical properties of these devices need to be matched to the tissue, soft materials, such as polymers are often preferred as a substrate [1]. Parylene is a good candidate, as it is highly biocompatible and it can be deposited/etched using standard Integrated Circuit (IC) fabrication methods/processes. Further, the implantable devices should be smart, a goal that can be accomplished by including ICs. These ICs, often come in the form of additional pre-packaged components that are assembled on the implant in a heterogenous process. Such a hybrid integration, however, does not allow for size minimization, which is so critical in these applications, as otherwise the implants can cause severe damage to the tissue. On the other hand, it is essential that all components are properly packaged to prevent early failure due to moisture penetration [2].
In this work we use a previously developed semi-flexible platform technology based on a Parylene substrate and Pt metallization, which allows integration of electronic components with a flexible substrate in a monolithic process. We use an IC fabrication-based platform that allows for the fabrication of several rigid regions including Application-Specific Integrated Circuits (ASICs) and other components connected to each other by means of flexible interconnects. We aim to add more functionality to this technology and thereby extend it to a platform for a variety of medical applications. An example of such functionality is integrating Light Emitting Diodes (LEDs) for optogenetic stimulation or integrating Capacitive Micromachined Ultrasound Transducers (CMUTs) for ultrasound stimulation or ultrasound wireless power transfer. Since the long-term reliability is critical for implantable devices, we intend to reinforce our implant with an extra Polydimethylsiloxane (PDMS) encapsulation layer that relies on the low viscosity of the uncured rubber to flow in every detail of the surface to prevent void formation [3]. Therefore, this work also focuses on enhancing the adhesion of PDMS to Parylene, as it must remain strong for the required lifetime of the device.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:8a89a169-6efa-44cc-9d5b-2df2b965a708","http://resolver.tudelft.nl/uuid:8a89a169-6efa-44cc-9d5b-2df2b965a708","The influence of soft encapsulation materials on the wireless power transfer links efficiency","Malissovas, Anastasios (Student TU Delft); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM)","","2019","As the era of Bioelectronic medicines (BEms) evolves, new technological challenges are generated, including miniaturized devices that are encapsulated with flexible materials and energized by wireless power transmission (WPT) techniques. Among them, magnetostatic, also known as inductive, and ultrasound (US) are the most viable candidates for shallow and deep applications, respectively. However, the conductive nature of the human tissue with high relative permittivity increases the parasitic components of the printed spiral coils (PSCs), while the acoustic impedance mismatch between the tissue and ultrasound transducers leads to power losses in the WPT link.
This study focuses on the influence of biocompatible, soft, polymeric materials, such as polydimethyloxane (PDMS) and Parylene-C, on the electrical behaviour of the aforementioned externally powered receivers. Unlike previous works, this investigation includes the high gas permeability property of polymers, predicting the electrical impact of moisture absorption. Analytical and simulation models are utilized to discriminate the effect of various packaging schemes and to relate their influence on the WPT link efficiency. Lastly, empirical measurements in air and saline aim to verify the proposed methods.
Early modelling results demonstrate that when a PSC is encapsulated with 50 μm PDMS and submerged into saline, its resonance frequency and quality factor are decreased by 3.6% and 34.2%, respectively. That renders the maximum theoretical WPT link efficiency to be reduced by 9%, compared to free-space propagation in air. Interestingly, when the coating thickness increases to 500μm, the WPT link efficiency drops only by 2.4%.
In the case of US, similar effects are predicted, yet the influence of the coating materials will be different. More specifically, their acoustic impedance decreases the US transducers’ natural frequency of vibration and mechanical quality factor, due to the effect of added mass. In addition, when the coating thickness increases towards the wavelength of the incident US wave inside the material, the aforementioned effects become more evident.
The outcome of this study aims to address the contributing factors on the WPT link power losses from the electronics packaging perspective and to suggest on how the effect of the surrounding medium could be mitigated, improving the WPT link efficiency.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:09467b51-75ee-4ba8-a3d7-5367cb553cf7","http://resolver.tudelft.nl/uuid:09467b51-75ee-4ba8-a3d7-5367cb553cf7","Design of a Multi-Functional Smart Optrode for Electrophysiology and Optogenetics","Martins Da Ponte, R. (TU Delft Bio-Electronics); Huang, C. (TU Delft QN/Zandbergen Lab); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM); Serdijn, W.A. (TU Delft Bio-Electronics)","","2019","Optogenetics is a neuromodulation method that holds great potential for the realization of advanced neuroprostheses due to its precise spatial-temporal control of neuronal activity [1]. The development of novel optogenetic implants (optrodes) may open new doors to investigate complex brain circuitry and chronical brain disorders, such as epilepsy, migraine, autism, Parkinson's disease, etc [2]. Design challenges for the optrode include interference minimization between the µLED drivers and the recording electrodes, selection of proper materials, structures and dimensions to minimize tissue damage, biocompability, and batch production. In this work, we propose the construction of a multi-functional optrode to be used for physiological studies in group-housed, freely-moving rodents. It comprises commercial blue-light µLEDs for optical stimulation, an active electrode array for recording the local field potentials at different depths in the brain, and a time-domain temperature sensor. To accomplish this, silicon bulk micromachining is the essential technique used for the device manufacturation. Process steps include epitaxial growth, layers deposition, geometrical etching, ionic implantation, oxidation and diffusion. For the interconnection of the µLEDs, flip-chip bonding is used. Light intensity and frequency can be controlled via a microcontroller interface assembled on a flexible PCB mounted on the rodent head-stage. The active microelectrode array (MEA) is constructed from a Ti/TiN layer to both meet the biocompatibility requirements and to reduce the electrode-tissue interface impedance, and by this the associated thermal noise. Using a custom, simple, robust and cost-effective BiFET in-house IC technology, the recording amplifiers are monolithically integrated into the MEA to achieve a high signal-to-noise ratio (SNR) and to minimize potential crosstalk coming from the µLED drivers. Using the same BiFET IC technology, a time-domain temperature sensor is monolithically integrated into the optrode to anticipate possible brain tissue temperature changes of more than 1oC that may come from heat dissipation in the µLEDs or circuit power dissipation. Finally, the optrode is coated with a PDMS film to electrically protect the µLEDs from the tissue and avoid uncontrollable electrical stimulation of the brain tissue.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:4bd3e91b-c733-4d10-b2d4-99a7b0b19431","http://resolver.tudelft.nl/uuid:4bd3e91b-c733-4d10-b2d4-99a7b0b19431","Design and Custom Fabrication of a Smart Temperature Sensor for an Organ-on-a-chip Platform","Martins Da Ponte, R. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM); Serdijn, W.A. (TU Delft Bio-Electronics)","","2019","Incubators in cell cultures are used to grow and maintain cells under optimal temperature alongside other key variables, such as pH, humidity, atmospheric conditions etc. As enzymatic activity and protein synthesis proceed optimally at 37.5 oC, a temperature rise can cause protein denaturation, whereas a drop in temperature can slow down catalysis and polypeptide initiation [1]. Inside the incubator, the measurements are gauged according to the temperature of the heating element, which is not exactly the same as that of the cells. Time spent outside the incubator can greatly impact cell health. In fact, out-of-incubator temperature and its change over time are unknown variables to clinicians and researchers, while a considerable number of cell culture losses are attributed to this reason. To accurately monitor the temperature of the culture throughout cell growth, an in situ temperature sensor with at least ±0.5 oC of resolution is of paramount importance. This allows the growth of the cultured cells to be optimized. This work reports on the design and fabrication of a time-mode signal-processing in situ temperature sensor customized for an organ-on-a-chip (OOC) application. The circuit was fabricated using an in-house integrated circuit technology that requires only 7 lithographic steps and is compatible with MEMS fabrication process. The proposed circuit is developed to provide
the first out-of-incubator temperature monitoring of cell cultures on an OOC platform in a monolithic fabrication. Measurement results on wafer reveal a temperature measurement resolution of less than ±0.2 oC (3σ) and a maximum nonlinearity error of less than 0.3% across a temperature range from 25 oC to 100 oC. To the authors’ best knowledge, no in situ temperature-sensing fully integrated on an OOC platform exists to date. This is the first time such integration is being performed using a custom designed circuit fabricated on the same silicon substrate as that of the OOC. The simple, robust, and custom IC technology used for the sensor fabrication grants a very cost-effective integrated
solution in virtue of the reduced cost per wafer along with the large silicon area available on the platform [2]. Moreover, no further complicated assembly and subsequent protection of the prefabricated components is required. This minimizes the extra processing steps, along with the related handling risks, leading to higher yields. Finally, the freedom enjoyed by the MEMSelectronics
co-design offers a large degree of versatility to accomodate electronics in a range of different OOC shapes and structures.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:8f3da347-8b0b-4dcc-987e-2bfa6515f623","http://resolver.tudelft.nl/uuid:8f3da347-8b0b-4dcc-987e-2bfa6515f623","Polymer-Encapsulated Single-Chip Implants for Bioelectronic Medicine","Nanbakhsh, K. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM)","","2019","The main goal of bioelectronic medicine is to, one day, replace conventional chemical drugs with miniaturized implants. This way, tiny electrical pulses will be locally delivered to a small group of neurons in order to influence and modify biological functions. Developing such implants, however, has brought many new challenges both in the technological and biological domains. One technical challenge, is packaging such tiny deceives in a way that protects the sensitive electronics inside from the harsh body environment [2], while, at the same time ensures certain flexibility that allows the implant to conform to the surrounding soft tissue. Conventionally, medical implants have relied on a titanium (Ti) or ceramic box to protect the inside electronics. Driven by the increased functionality offered by CMOS technologies and the need for further miniaturization, in recent years tremendous efforts have been made in designing miniaturized implants by integrating the majority of components on a single chip [3]. Such a single-chip approach, however, would require novel packaging solutions since the box would consume greater volume compared to the chip and greatly limit the flexibility of the implant. Polymer encapsulation could be an alternative packaging solution which meets the physical constraints needed for bioelectronic medicine [1-2]. One main drawback of polymeric encapsulation, however, is the eventual penetration of water through the polymer. For this purpose, extensive efforts have been carried out on finding thin multi-layer coatings that could delay water and ion penetration and thereby, increase device lifetime [3]. Despite the increased protection offered by these layers, it has been shown that device lifetime can still be reduced when exposed to high electric fields. For example, the authors of [4] have found that continuous DC biasing of the device reduced the lifetime by a factor of 13 compared to a state where the devices were idle. In this research, we intend to work towards a single-chip implant by investigating the effect of different electric fields on device lifetimes in soak conditions. For this aim, test structures have been fabricated in standard CMOS technologies and currently being tested in saline. More detailed and up-to-date results will be shared during the conference.","","en","abstract","","","","","","","","","","","Bio-Electronics","","",""
"uuid:68f0a8a6-9efa-4e63-9f50-4e3fa2cdea5c","http://resolver.tudelft.nl/uuid:68f0a8a6-9efa-4e63-9f50-4e3fa2cdea5c","Embedding Small Electronic Components into Tiny Flexible Implants","Pak, A. (TU Delft Bio-Electronics); Serdijn, W.A. (TU Delft Bio-Electronics); Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM)","","2019","Electronic components in the form of application-specific integrated circuits (ASICs) establishing the communication between the body and the implant, such as stimulation and recording, have, nowadays, become essential elements for current and future generations of implantable devices, as medicine is looking into substituting its traditional pharmaceuticals with electroceuticals, or bioelectronic medicines [1].
Protection of implant components inside the body is a mandatory important step to ensure longevity and reliable performance of the device. The package of the implant should act as a bidirectional diffusion barrier protecting the electronics of the device from body liquids, and also preventing diffusion of toxic materials from the implant towards the tissue. At the same time the implant’s outer layer should match the tissue’s mechanical properties in order not to cause scar growth around the implant or damage the body.
Current implants do not completely fulfill the desired properties mentioned above, either lacking hermeticity or softness.
In this work, an embedding process developed at Fraunhofer IZM [2] and used in the semiconductor packaging field for chip encapsulation is proposed to be modified and used for protecting implantable ASICs. Such a method will have a number of advantages, such as miniaturization, in comparison with conventional titanium case packaging. Furthermore, embedding allows to avoid long interconnects, which can be a crucial problem for the device implanted inside a constantly moving body. The other advantage is that the geometry of these interconnects can be well controlled, and the amount of contact pads can be higher than in widely used wire bonding technology, because the distribution of solder bumps during embedding can take place on the whole chip area.
In the proposed process, biocompatible polymer materials, such as ParyleneC and Polyurethane, together with thin glass films will be employed to provide the implant with the required hermeticity and at the same time flexibility. The developed embedding process technology will ensure homogeneous distribution of mechanical stresses, resulting in high reliability for uninterrupted long-term use of smart implants.
Since the seventeenth century country houses and suburban villas were designed in relationship to important landscape elements, creating groups of country estates in so called country estates landscapes [2]. Nowadays, country estates landscapes are valued for climatological, ecological and landscape architectural values as well as culturalhistorical and identity valuesThese heritage landscapes can be seen as large scale greenblue systems in our urbanised landscapes and are contributing to a sustainable living area and are creating place for enhancing biodiversity and life on earth (SDG 11 and 15).
One of the essential structuring elements of country estates landscapes is water, which is to be found on any country estate. Appointing groups of country estates can be used for reading the historic roots of these landscapes, and to create coherent landscapes and identifying a regional narrative, but can function as a starting point to organise cooperation amongst stakeholders to ensure preservation of these large scale heritage landscapes.
Due to climate change, these values are under pressure due to weather extremes like the lack or water during summer interspersed with heavy rainfall in fall and winter. Nowadays, country houses are (more or less) dealing with these issues separately [3]. Cooperation between government, owners and stakeholders is needed to enhance environmental issues on topics like water management and regional identity and so on.
To bridge the private issues in regional cooperation, groups of esattes should be appointed using similarities in landscape elements. The paper start with a theoretical description on how groups of country estates can be organised and it will be applied to cooperation within the brook system Baakse Beek and its country houses, suffering from severe draught in the summer [4].","heritage; Sustainability; SDG","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:b3777d65-a493-4960-9553-964ffa90425d","http://resolver.tudelft.nl/uuid:b3777d65-a493-4960-9553-964ffa90425d","Increase quantum computing technology readiness level through experimentation in space","Correale, G. (TU Delft Wind Energy); Cerrone, Gianluca (Rhea Group); Al-Ars, Z. (TU Delft Computer Engineering); Bertels, K.L.M. (TU Delft FTQC/Bertels Lab; TU Delft (OLD)Quantum Computer Architectures)","","2019","The exploitation of quantum physics and of quantum states superposition and entanglement properties for computing applications has been studied since 1980s [1] [2] for their disrupting potential in the evolution of information theory. Although quantum computing is still in its infancy, experiments have been carried out and proto-types have been developed, showing promising results for future commercial applications [3] [4] [5] [6]. Research in both theoretical and practical areas continues at a frantic pace, and many national governments, research institutions and military funding agencies support quantum computing research to develop quantum computers for both civilian and national security purposes, such as cryptanalysis, genetics, drugs and disease research, materials science and design and so on [2]. Thanks to its computing power, the usage of quantum computing capabilities in orbit would bring priceless benefits to space and enable novel methodologies and technologies to improve both on ground and in space applications. On-board cyber-security, satellite AI, advanced autonomous life support systems for human exploration are only few of the domains which could be dramatically boosted by the availability of this technology. The paper discusses an early study about an experimentation of a quantum computer in orbit as a first step for a future fully qualified flight-ready payload. It discusses the major benefits of a flight experimentation, focusing on the one hand on the objectives and the expected benefits that it will bring to the development of the space borne and on-ground technology, on the other hand on the open questions like the effect of microgravity on the architecture of this technology. It analyses the currently available implementation solutions of quantum computers on ground which are currently prototyped (e.g. IBM Q System One), and provides early results on the identified main technical aspects to be considered to improve the technology readiness level. It highlights the most important challenges to be considered in the design and the added value that the space environment will bring as scientific feedback. Finally, it describes possible scenarios and mission profiles analysed and identified as potential hosting platform candidates, focusing on pros and cons of each of them.","Quantum Computer in Space; Quantum Computing; Space Applications; TRL","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:c3816121-4354-4046-a15b-37cab3d3363f","http://resolver.tudelft.nl/uuid:c3816121-4354-4046-a15b-37cab3d3363f","Fiber optic distributed acoustic sensing for levee monitoring","Aguilar Lopez, J.P. (TU Delft Hydraulic Structures and Flood Risk); Bogaard, T.A. (TU Delft Water Resources); Ruiz, Andres Garcia (Universidad de Alcalá); Herràez, Miguel Gonzàlez (Universidad de Alcalá); Drijkoningen, G.G. (TU Delft Applied Geophysics and Petrophysics)","","2019","","","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:5c54dc71-42b6-4760-af4b-b2033637c83c","http://resolver.tudelft.nl/uuid:5c54dc71-42b6-4760-af4b-b2033637c83c","How hard is it to detect abrupt changes in the statistics of time series?","van Nooijen, R.R.P. (TU Delft Water Resources); Kolechkina, A.G. (TU Delft Water Resources); Zhou, C. (TU Delft Water Resources)","","2019","","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:f8dacbeb-842d-4a71-a269-33a260f4a93e","http://resolver.tudelft.nl/uuid:f8dacbeb-842d-4a71-a269-33a260f4a93e","Validation of existing perception models within the context of motion sickness","Irmak, T. (TU Delft Intelligent Vehicles); Pool, D.M. (TU Delft Control & Simulation); Happee, R. (TU Delft Intelligent Vehicles)","","2019","Background: Motion sickness (MS) as an area of scientific inquiry has mostly seen experimental work. A range of models attempt to predict MS, but have not been validated for a broad selection of sickening motion stimuli. By doing so this study aims to identify models that lead to better sickness predictions. Lastly, the study will also elaborate on the effects of vision, a key factor in motion sickness of automated driving in particular. Methods: Three models of spatial orientation are compared, the TNO model, the Newman model and the probalistic particle filter model. The models are tuned and validated with respect to the perceptual responses to earth-vertical axis rotation, off-vertical axis rotation and centrifugation. Internal conflict terms are used as a proxy for sickness prediction. Sickness responses are evaluated for five motion paradigms: pure roll, pure lateral and vertical acceleration, off-vertical axis rotation and cross-coupled coriolis stimulation. MS susceptibility as a function of frequency is derived for 3D acceleration and rotation for 3 different visual conditions; internal vision, external vision and darkness. Results: Preliminary results show that models do not adequately explain differences in sickness response observed between motion paradigms. For the TNO model, MS susceptibility as function of frequency matches experiments for vertical acceleration in darkness, but not for horizontal plane acceleration. The inclusion of vision shifts the center frequency from 0.2 Hz to 0.1 Hz for vertical acceleration, but does not affect the horizontal response. The Newman model predictions are the least accurate due to a direct coupling between state estimates and conflict terms. The particle filter model shows promise in that parameter variations approximately reproduce the MS susceptibility observed for lateral accelerations. However unlike the TNO & Newman models, it cannot account for vertical motion sickness as by design its predictions are based on the somatogravitic illusion.","","en","abstract","","","","","","","","","","","Intelligent Vehicles","","",""
"uuid:95cc005a-5844-496d-88c6-14d83bc8e119","http://resolver.tudelft.nl/uuid:95cc005a-5844-496d-88c6-14d83bc8e119","A numerical model of a 3-dimensional low-density turbidity current in the deep ocean: testing hypotheses on turbidity currents in deep detail","Azpiroz Zabala, M. (TU Delft Applied Geology); Storms, J.E.A. (TU Delft Applied Geology); van der Vegt, H. (TU Delft Applied Geology; Deltares); Walstra, D.J.R. (Deltares); Obradors-Latre, Arnau (Equinor ASA); Pontén, Anna (Equinor ASA)","","2019","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:1d49096b-83f5-4ec9-8579-1b65e2405669","http://resolver.tudelft.nl/uuid:1d49096b-83f5-4ec9-8579-1b65e2405669","North Atlantic Ocean Circulation around Greenland in CESM 2.0","Ernani da Silva, C. (TU Delft Physical and Space Geodesy); Vizcaino, M. (TU Delft Physical and Space Geodesy); Katsman, C.A. (TU Delft Environmental Fluid Mechanics)","","2019","","","en","abstract","","","","","","","","","","","Physical and Space Geodesy","","",""
"uuid:7b4ca82c-2464-4c62-87ce-0aae6efd9665","http://resolver.tudelft.nl/uuid:7b4ca82c-2464-4c62-87ce-0aae6efd9665","Monitoring the strength development of mud layers in ports and waterways","Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chassagne, C. (TU Delft Environmental Fluid Mechanics)","","2019","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:46dc6f42-faaf-436b-a9f2-3888fc395a6a","http://resolver.tudelft.nl/uuid:46dc6f42-faaf-436b-a9f2-3888fc395a6a","Spatial and temporal variability of the biological activity of tidal Elbe sediments in the Port of Hamburg","Zander, F. (TU Delft Geo-engineering); Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Chassagne, C. (TU Delft Environmental Fluid Mechanics); Gebert, J. (TU Delft Geo-engineering)","","2019","","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:31b42a09-e6e2-4339-b769-74dd49f5a4f2","http://resolver.tudelft.nl/uuid:31b42a09-e6e2-4339-b769-74dd49f5a4f2","Reallocation of sediment within the harbor, part of a green port strategy","Wijdeveld, A.J. (Deltares); Wensveen, Marco (Port of Rotterdam Authority); Groot, Hans (Deltares); Kirichek, Alex (Deltares)","","2019","","","en","abstract","","","","","","","","","","","","","",""
"uuid:f98fd4c0-3b96-441b-8547-c70c45463441","http://resolver.tudelft.nl/uuid:f98fd4c0-3b96-441b-8547-c70c45463441","Rheological characterization of fluid mud in ports and waterways","Shakeel, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Zander, F. (TU Delft Geo-engineering); Gebert, J. (TU Delft Geo-engineering); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Chassagne, C. (TU Delft Environmental Fluid Mechanics)","","2019","","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:dfe50300-d4bf-4b3f-a2ed-ceea9bbcb649","http://resolver.tudelft.nl/uuid:dfe50300-d4bf-4b3f-a2ed-ceea9bbcb649","Effects of Using Avatars in a Game-Based Learning Environment","Lukosch, H.K. (TU Delft Policy Analysis); Broekhans, B. (TU Delft Business Development; TU Delft ESA extension school); Gordijn, J.M.W. (TU Delft Teaching & Learning Services)","","2019","Peer reviewing is an approach often used in digital (higher) education as it represents a possibility to provide feedback to large student groups. However, especially in digital learning contexts, students feel being disconnected from the anonymous group of learners, leading to low-quality feedback. When feedback is open, and counterparts are known, this knowledge can lead to biases when commenting on each other’s work. We developed a game-based learning environment called ‘The Great Library’ that we used to analyse the effect of avatars as game element to limit the effects of both fully anonymous and fully open feedback. Students and teachers using the new game-based learning environment were asked to provide feedback on their experiences with the learning environment and the use of avatars. The responses were compared to the same course provided without game elements. The qualitative data analysis reveals that the introduction of avatars still lacks acceptance on the side of the students, yet that they feel a sense of community in the GBL. Open and direct feedback is still used and appreciated by the students. The anonymity of the peer reviews resulting from the use of the avatars represents a challenge for the student-teacher interaction. The environment and set-up of the course in a whole still needs some adjustment in order to fully support the learning process of the students.","game-based learning; avatar; gamification; peer feedback; peer review; Game-based learning; Peer feedback; Peer review; Gamification; Avatar","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:ff70d58b-e691-43ff-90ed-628e1ff4fd58","http://resolver.tudelft.nl/uuid:ff70d58b-e691-43ff-90ed-628e1ff4fd58","Serendipitous Asteroid Detections with JWST-MIRI","Mueller, Michael (NOVA; Universiteit Leiden; SRON Netherlands Institute for Space Research); Brandl, B.R. (TU Delft Astrodynamics & Space Missions; Universiteit Leiden); Husárová, Lenka (Student TU Delft)","","2019","The James-Webb Telescope, to be launched in 2021, will be a great tool to measure the size of asteroids. Many mid-infrared observations will detect asteroids, whether that's intended or not. We calculate how many asteroids will be detected that way (serendipitously): many thousands, mostly asteroids that are too small to be observable today.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:b26c8c9a-cc00-4dda-8166-5235d5d4ab66","http://resolver.tudelft.nl/uuid:b26c8c9a-cc00-4dda-8166-5235d5d4ab66","In-situ study of corrosion of commercial SD memory card by local electrochemical techniques","Mousavi, M. (TU Delft (OLD) MSE-6); Mol, J.M.C. (TU Delft (OLD) MSE-6); Gonzalez Garcia, Y. (TU Delft (OLD) MSE-6)","","2019","","","en","abstract","","","","","","Abstracts Book","","","","","(OLD) MSE-6","","",""
"uuid:bfdcdf10-16c0-49dd-91ee-a3e4f50fe0df","http://resolver.tudelft.nl/uuid:bfdcdf10-16c0-49dd-91ee-a3e4f50fe0df","In-situ study of corrosion phenomena on electronic devices by local electrochemical techniques","Mousavi, M. (TU Delft (OLD) MSE-6); Mol, J.M.C. (TU Delft (OLD) MSE-6); Gonzalez Garcia, Y. (TU Delft (OLD) MSE-6)","","2019","","","en","abstract","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:86a2f328-6b5c-4749-b02c-90c674d55d11","http://resolver.tudelft.nl/uuid:86a2f328-6b5c-4749-b02c-90c674d55d11","Advancing Analysis Techniques for Plantar Pressure Videos via Open-Access Contributions","Booth, Brian G. (Universiteit Antwerpen); Keijsers, Noël L.W. (Sint Maartenskliniek, Nijmegen); Huysmans, T. (TU Delft Applied Ergonomics and Design; Universiteit Antwerpen); Sijbers, Jan (Universiteit Antwerpen)","","2019","While dynamic plantar pressure measurements are commonly used for clinical evaluation of gait-related problems, computational analysis techniques for these datasets are few and farbetween. To address this issue, we introduce an open-access database of plantar pressure videos for researchers to develop algorithms around.","","en","abstract","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:e80501d9-3ad4-4498-8cf2-44c6238890df","http://resolver.tudelft.nl/uuid:e80501d9-3ad4-4498-8cf2-44c6238890df","Safeguarding Syrian archaeological Heritage: humanities and natural sciences","Nieuwenhuyse, Olivier (Universiteit Leiden); Hiatlih, Khaled (Universiteit Leiden); Hakki, Rasha (Centre for Global Heritage and Development Leiden Delft Erasmus); al-Fakhri, Ayham (Universiteit Leiden); Ngan-Tillard, D.J.M. (TU Delft Geo-engineering); Verlinden, J.C. (TU Delft Mechatronic Design); Lambers, Karsten (Universiteit Leiden); Buch, Katarina (Centre for Global Heritage and Development Leiden Delft Erasmus); Mara, Hubert (Universiteit Leiden)","","2019","","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:cd353f9f-c419-49b1-bc9b-3e895048561e","http://resolver.tudelft.nl/uuid:cd353f9f-c419-49b1-bc9b-3e895048561e","Brutalism and the Welfare State: Histories of Displacement, 1952-2017","van den Heuvel, D. (TU Delft Space & Type)","","2019","Abstract for
The Brutalist Turn conference
Azrieli School of Architecture, Tel Aviv University, and the Azrieli Architectural Archive, Tel Aviv Museum of Art
14-16 April, 2019
My presentation will look into the intersections of New Brutalism and welfare state politics, using the case of Alison and Peter Smithson to unpack some of the dominant myths of the period. I will use some of my recent research findings to hypothesize that when looking at the British welfare state system we are not so much looking at a universalist project of citizens’ emancipation but at a continuation of disruptive development at the cost of lower class communities in particular.
It was Kenneth Frampton who suggested a direct link between the New Brutalism and the welfare state in his famed Modern Architecture: A Critical History (1980, 1985). Yet, the link is not quite substantiated in his 7-page discussion of the architecture of the Smithsons and Stirling and Gowan.
I will first contextualize the case of Robin Hood Gardens and demonstrate its rather exceptional qualities, not only in terms of its architecture, but especially in terms of the local council policies, and the larger history of the construction of the London Docklands and its immediate housing districts.
Secondly, I will highlight some of the propositions as conceptualized by the Smithsons for the welfare state-architecture nexus, and how they – at first optimistically but also naively – developed their ideas over the years, from the cheerfulness of the House of the Future in 1956 to the pessimism of ‘The Violent Consumer’ in 1974, and from an embracing of the ideas of the Labour politician and Minister for Health and Housing Aneurin Bevan as he put down in his testimonial In Place of Fear (1952), to Team 10’s dismissive discussions of the ‘Labour Union Society’ mid-1970s.
My presentation will be concluded with a few observations concerning the afterlife of Robin Hood Gardens, the demise of the British system of planning and housing, and the ruthless metabolism of a ‘superstar city’ like London (Richard Florida, 2017), which devours its own architecture and history in its relentless strife for capitalist hegemony as driven by the speculative logic of global real estate surplus value.
In the research, the material properties of natural sediment from the Markermeer were determined and, the consolidation, drying and undrained shear strength was studied for varying solid compositions. Furthermore, the influence of vegetation and drainage during consolidation and drying was investigated.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:a15a2662-2707-44f8-82f5-9de8f5c569b5","http://resolver.tudelft.nl/uuid:a15a2662-2707-44f8-82f5-9de8f5c569b5","Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation","Velea, Andrada (Student TU Delft); Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Giagka, Vasiliki (TU Delft Bio-Electronics)","","2019","Our aim is to develop a smart neural interface with transparent electrodes to allow for electrical monitoring of the site of interest during optogenetic stimulation of the spinal cord. In this work, we present the microfabrication process for the wafer-level development of such a compact, active, transparent and flexible implant. The transparent, passive array of electrodes and tracks have been developed using graphene, on top of which chips have been bonded using flip-chip bonding techniques. To provide high flexibility, soft encapsulation, using polydimethylsiloxane (PDMS) has been used. Preliminary measurements after the bonding process have shown resistance values in the range of kΩ for the combined tracks and ball-bonds.","","en","abstract","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:db1a1aa9-4a6c-446e-9797-e8f5682fafe8","http://resolver.tudelft.nl/uuid:db1a1aa9-4a6c-446e-9797-e8f5682fafe8","Measuring oblique wave run-up and overtopping with laser scanners","Oosterlo, P. (TU Delft Hydraulic Structures and Flood Risk); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); van der Meer, J.W. (TU Delft Hydraulic Structures and Flood Risk; Van der Meer Consulting Bv; IHE Delft Institute for Water Education); Overduin, Maarten (Infram Hydren); Steendam, Gosse Jan (Infram International); Nieuwenhuis, Jan-Willem (Waterschap Noorderzijlvest); van Vledder, G.P. (TU Delft Environmental Fluid Mechanics); Steetzel, Henk (ARCADIS Nederland); Reneerkens, Michiel (Aqua Vision)","","2019","","Laser scanner; LIDAR; wave run-up; wave overtopping; layer thickness; front velocity; dike grass cover; sea dike; field measurements; dike safety assessment","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:c1be8458-37be-4747-b703-6a11fb8a388b","http://resolver.tudelft.nl/uuid:c1be8458-37be-4747-b703-6a11fb8a388b","Wave modelling and field measurements in a complex estuary","Oosterlo, P. (TU Delft Hydraulic Structures and Flood Risk); van Vledder, G.P. (TU Delft Environmental Fluid Mechanics; Van Vledder Consulting); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); van der Meer, J.W. (TU Delft Hydraulic Structures and Flood Risk; Van der Meer Consulting Bv; IHE Delft Institute for Water Education); Geleynse, Nathanaël (ARCADIS Nederland); Reneerkens, Michiel (Aqua Vision); Steendam, Gosse Jan (Infram International); Veendorp, Marco (Waterschap Noorderzijlvest)","","2019","","","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:e5c73d4f-cfc2-4a8f-bdfe-aa48ce13a17b","http://resolver.tudelft.nl/uuid:e5c73d4f-cfc2-4a8f-bdfe-aa48ce13a17b","Or more houses or more woods: A holistic approach to value historic urban green structures","Verschuure, G.A (TU Delft Landscape Architecture); Dijkstra, C.M. (TU Delft Landscape Architecture)","","2019","This paper advocates a renewed attitude towards our urban nature, recognizing its trees as green heritage with the capability to increase the liveability of urban areas (SDG11). Planting trees in the Dutch public space started in the seventeenth century and cities became famous for its green atmosphere (1). In the agricultural landscape, trees were methodically planted on country estates and along infrastructure, connecting the rural landscape with the cities (2).
Nowadays, green historic elements are highly values, but doesn't het the same assigned priority as built heritage. The ensuring upcoming public discussion (3) shows a lack of understanding the different values of historic green, especially within the framework of climate change, climate mitigation properties of trees in and around cities and the value for the liveability for communities.
This paper describes a new attitude towards valuing historic green structures. Therefore, a model 4) for holistic understanding as simultaneous physical, mental, and social manifestation in the public realm will be described 5). By recognizing these different aspects, historic urban green structures can be understood and discussed as part of green blue systems, perceiving their climatological, ecological, landscape architectural, and culturalhistoric values.","heritage; SDG","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:95ef6718-174c-4bde-b8e5-5ee26ee40c51","http://resolver.tudelft.nl/uuid:95ef6718-174c-4bde-b8e5-5ee26ee40c51","Role of trunk inertia in non-stepping balance recovery","Schumacher, C.A. (TU Delft Biomechatronics & Human-Machine Control; Technische Universität Darmstadt); Berry, Andrew (TU Delft Biomechatronics & Human-Machine Control); Seyfarth, André (Technische Universität Darmstadt); Vallery, H. (TU Delft Biomechatronics & Human-Machine Control)","","2019","Previous research has identified two major non-stepping strategies used to recover balance following mechanical perturbations: ankle and hip strategy [1, 2]. These strategies are selected depending on eg the perturbation magnitude, prior experience, and configuration of the support surface [2] in order to control the posture (upright trunk and leg orientation) and angular momentum [3, 4]. Following an external mechanical perturbation, both body posture and angular momentum depend, in part, on passive properties of the body, such as the amount and distribution of mass. Simple mechanical models, like the inverted pendulum (IP)[4, 5] or the double IP [6] suggest an approximately linear inverse relationship between the inertia of a perturbed body segment and the resultant acceleration and, presumably, also the segment deflection.
Image-to-speech (ITS) is the task of generating a spoken description of an image, in a language that has no written form. ITS can be trained and tested as a neural sequence-to-sequence transduction problem, in which an input sequence of sub-images is encoded, attended, and converted into a sequence of phone symbols, from which an output audio signal can be generated. The quality of ITS output varies dramatically depending on the quality of the phone set. Cheating experiments using a known correct phone set resulted in intelligible and meaningful spoken descriptions, but experiments using a cross-language phone set, or one automatically created using unsupervised methods, do not. Extrapolating beyond current experimental results, a simulated annealing algorithm will be presented that may be capable of finding the globally optimal phone set for matching a given ITS training database.
Speech-to-chat (STC) is the task of converting speech into a variably spelled transcription in the Latin alphabet, similar to the Latin-alphabet transcriptions used in online chat forums to represent colloquial dialects of multi-register languages such as Arabic and Hindi. Such chat transcripts can be easily collected, even from non-speakers of the language. When a non-speaker of the language writes down what she hears using a chat alphabet, she tends to map every phoneme in the utterance language to the most similar phoneme in her own language, where similarity can be defined by a weighted L1 distance between articulatory feature vectors. For this reason, the speech-to-chat paradigm allows us to infer a phone set that's actually pretty close to the unknown phoneme set of the unwritten language. Experiments were performed in which pseudo-under-resourced languages (Cantonese and Vietnamese, neither of which is truly ""unwritten,"" though few people know how to write Cantonese) were transcribed by native speakers, and phonemic transcripts were generated from their transcriptions. Chat-alphabet transcriptions by non-speakers of Cantonese were then clustered in order to estimate the phonemic transcript. Extra information about the Cantonese phonemes (e.g., elicited from non-native transcribers with more than one native language) improves the quality of transcription.
We interpret these two results to mean that defining a better phone set for an unwritten language improves the quality of both image-to-speech and speech-to-chat applications.
of a planet. Clouds usually affect the planet’s observables. We investigate here the effect of partial and variable cloud coverage on the light that is reflected by an
Earth-like exoplanet, exploring not only the total flux but also the linearly and circularly polarized fluxes.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:9ab8bdfd-63ef-4ab4-b88a-56ec30470851","http://resolver.tudelft.nl/uuid:9ab8bdfd-63ef-4ab4-b88a-56ec30470851","Modelling the mechanical response of adobe components under uniaxial loadings","li Piani, T. (TU Delft Applied Mechanics; TNO; Netherlands Defence Academy); Weerheijm, J. (TU Delft Applied Mechanics; TNO); Koene, L. (Netherlands Defence Academy); Sluys, Lambertus J. (TU Delft Materials- Mechanics- Management & Design)","","2018","This paper presents a constitutive relationship to describe the uniaxial response in statics of brick and mortar samples of Adobe. This defines a traditional masonry whose components are made of soil mixture reinforced with fibres. Only recently Adobe has started attracting scientific attention, primarily as a consequence of the dramatic failures these structures have suffered in regions prone to earthquakes due to dynamic loadings. Furthermore, it possesses eco-friendly material properties which are attractive features for western countries forced to reduce the environmental impact of modern building industry. Nevertheless, the mechanical properties of Adobe are still largely neglected, especially with regards to the influence of soil mixture components. The study of the structural performance of masonry starts from the assessment of the material performance of its components. Thus, an extensive characterization campaign was organized and performed by Delft University of Technology and the Military Engineering Laboratory of the Netherlands, in order to characterize the material properties of Adobe components. Three types of bricks and one type of mortar, made with different mixture components proportions, were subjected to granulometry, moisture content, density tests and uniaxial compressive and three point bending tests. Predictive formulations for compressive and tensile strength and deformation values have been proposed by the authors [1]. These relations include the dependency of mixture components and moisture contents. In this paper, constitutive laws are developed for Adobe in pure compression and tension according to the experimental results. In compression, the force-displacement curves were interpolated according to several existing constitutive laws and the model originally developed by Priestley for concrete masonry elements was finally selected as best fitting. Despite the differences in terms of mechanical parameters, the analytical assessment revealed that the experimental force-displacement graphs of all the different types of bricks could be interpolated using the same model with the same calibrating values. Furthermore, the uniaxial response in tension was derived according to an inverse approach. A numerical model recently developed and calibrated with respect to the compressive and bending tests was used to simulate uniaxial tensile tests [2]. Also in this case, a common trend among types was observed. The results of the constitutive modelling frames components of Adobe within the class of quasi brittle (geo)materials, with particular reference to concrete-like materials. This paper presents the experimental results of the tested samples and the related analytical and numerical modelling.","Adobe; brick; mortar; Priestley; tension; compression; Adobe delta model; concrete; quasi brittle","en","abstract","","","","","","","","","","Materials- Mechanics- Management & Design","Applied Mechanics","","",""
"uuid:418aa6a3-4a20-45b6-a3cd-b5641d5683dc","http://resolver.tudelft.nl/uuid:418aa6a3-4a20-45b6-a3cd-b5641d5683dc","The influence of the Sand Engine on the Delfland coastal cell","Roest, Lambertus W.M. (TU Delft Coastal Engineering)","","2018","The Sand Engine is an example of a feeder nourishment that is intended to nourish coastal systems. This strategy is based on placing sediments highly concentrated at one location, from which it is expected to spread alongshore over large distances on decadal timescales.
Here the morphological development of the Sand Engine mega feeder nourishment and the adjacent coastal sections is presented. This study is based on 37 high-resolution topographical surveys, spanning a coastal cell of 17 km alongshore. These data are explored to examine the alongshore spreading in the first five years after construction in 2011, as well as the response at different depth contours in the coastal profile.
The analysis shows that the highly concentrated nourishment supplies sediment to a stretch of coast that is several times the initial length of the nourishment, as the size of the Sand Engine peninsula increased from 2.2 to 5.8km alongshore. The plan-form shape of the peninsula is found to gradually extend alongshore, while reducing in cross-shore extent. This behaviour is found to vary strongly with depth contours. The strongest response was found around the mean sea level iso-bath in contrast to the deeper parts and Aeolian parts of the Sand Engine. This variability in response over depth results in different profile slope development in accretive and erosive areas. In coastal sections which are eroding the sub-tidal slope decreases, while accretive profiles experience a profile slope increment over time. The cross shore extent of the morphologic response shows limited morphodynamic activity below the -8m NAP depth contour and confirms earlier assessments of closure depth at this coast.
The current findings at the Sand Engine imply that mega feeder nourishments can be beneficial to the sediment budget of a larger coastal cell. However, volumes that are deposited around or below the depth of closure (around 15 % for the Sand Engine) may react on much longer time-scales than intended. Therefore, the feeding characteristics of mega feeder nourishments on time-scales of years should be assessed using the nourished volumes above the depth of closure rather than the total volume.","Sand Engine; Sand Motor; Delfland; Sediment transport","en","abstract","","","","","","Abstract to the presentation given at the NCK days 2018.","","","","","Coastal Engineering","","",""
"uuid:f46dd6d4-6be9-4e7b-9262-d0f37f33c996","http://resolver.tudelft.nl/uuid:f46dd6d4-6be9-4e7b-9262-d0f37f33c996","A Si/SiGe based quantum dot with floating gates for scalability","Xue, X. (TU Delft QCD/Vandersypen Lab); Corna, A. (TU Delft QCD/Vandersypen Lab); Samkharadze, Nodar (TU Delft QCD/Vandersypen Lab); Veldhorst, M. (TU Delft QN/Veldhorst Lab); Ishihara, R. (TU Delft QID/Ishihara Lab; TU Delft Quantum Circuit Architectures and Technology); Vandersypen, L.M.K. (TU Delft QuTech Advanced Research Centre; TU Delft QN/Vandersypen Lab)","","2018","","","en","abstract","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-21","","","QCD/Vandersypen Lab","","",""
"uuid:eec53cff-5022-4ecb-979f-5c53b2f0bfa5","http://resolver.tudelft.nl/uuid:eec53cff-5022-4ecb-979f-5c53b2f0bfa5","Modelling the effect of foreign origin on mode choice in two different cycling cultures","Haustein, Sonja (Technical University of Denmark); Kroesen, M. (TU Delft Transport and Logistics); Mulalic, Ismir (Institute for Urban Economic Research)","","2018","","","en","abstract","","","","","","","","","","","Transport and Logistics","","",""
"uuid:bbabab6a-625b-4f23-bb0f-8d7d132f4369","http://resolver.tudelft.nl/uuid:bbabab6a-625b-4f23-bb0f-8d7d132f4369","Possibilities and constraints for the widespread application of solar cooling integrated façades","Prieto Hoces, A.I. (TU Delft Design of Constrution); Knaack, U. (TU Delft Architectural Engineering +Technology); Klein, T. (TU Delft Building Product Innovation); Auer, Thomas (Technische Universität München)","","2018","","","en","abstract","","","","","","","","","","Architectural Engineering +Technology","Design of Constrution","","",""
"uuid:26b0fa55-fe6c-4dd2-a06c-ebf23449dd87","http://resolver.tudelft.nl/uuid:26b0fa55-fe6c-4dd2-a06c-ebf23449dd87","Smart and Multifunctional Materials and their possible application in façade systems","Juaristi Gutierrez, M. (Universidad de Navarra); Monge-Barrio, Aurora (Universidad de Navarra); Knaack, U. (TU Delft Architectural Engineering +Technology); Gómez-Acebo, Tomas (Universidad de Navarra)","","2018","","","en","abstract","","","","","","","","","","Architectural Engineering +Technology","","","",""
"uuid:3050f77d-1fdf-4964-a3ac-a8ea50ba135d","http://resolver.tudelft.nl/uuid:3050f77d-1fdf-4964-a3ac-a8ea50ba135d","S5P/TROPOMI: The first year in orbit","Veefkind, Joris Pepijn (Royal Netherlands Meteorological Institute (KNMI)); Aben, Ilse (SRON Netherlands Institute for Space Research); Dehn, Angelika (European Space Research Institute); Kleipool, Quintus (Royal Netherlands Meteorological Institute (KNMI)); Landgraf, Jochen (SRON Netherlands Institute for Space Research); Loyola, Diego G. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Richter, Andreas (University of Bremen); van Roozendael, Michel (Royal Belgian Institute for Space Aeronomy (BIRA-IASB)); Levelt, Pieternel Felicitas (TU Delft Atmospheric Remote Sensing)","","2018","On 13 October 2017 the European Sentinel 5 Precursor was successfully launched, with on board the TROPOMI (TROPOspheric Monitoring Instrument). TROPOMI is an imaging spectrometer developed by The Netherlands and ESA for monitoring the atmospheric composition, for air quality climate and ozone layer monitoring. The launch of TROPOMI marks the start of operational atmospheric composition measurements from space within the European Copernicus programme, the largest Earth observation programme in the world.
After one month of instrument checkout, the first light of TROPOMI was received in November 2017. During the commissioning phase the TROPOMI instrument settings were optimized. This included an increase in the spatial sampling from 7x7 to 3.5x7 km2(across track x along track), for most of the TROPOMI spectral bands.
The S5P commissioning phase was completed half a year after launch and on 30 April 2018 the routine operations were started. The first batch of data products was publicly released on 11 July 2018. By the time of the AGU fall meeting, almost all the data products must have been released.
TROPOMI has provided very exciting results during its first year in orbit. Very remarkable are the plumes of short-lived gases like NO2, which can extend several tens of kilometers from the source. These plumes were predicted by air quality models; however it requires the spatial resolution of TROPOMI to see them from space. Also, the CO maps have attracted a lot of attention. Because of the high sensitivity for the entire vertical column, both the sources as well as the transport of CO are clearly visible in the TROPOMI data.
The high spatial resolution of the TROPOMI data also poses new challenges. More than for the previous satellite sensors, the need for accurate modelling of the surface reflectance becomes clear. Also, the 3D effects of clouds are now more prominent. All these aspects are also important for the upcoming geostationary missions within the CEOS air quality constellation.
In this presentation an overview will be given of the status of the mission, including the in-orbit calibration and the data products. Specific results will be highlighted that illustrate the new capabilities of TROPOMI and also the challenges that need to be addressed in future updates of the data products.","","en","abstract","","","","","","Abstract A51A-01 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: A51A Advances in an Integrated Global Observing System for Air Quality I","","2019-06-14","","","Atmospheric Remote Sensing","","",""
"uuid:cbf46287-0d6e-4765-9592-960685f8d848","http://resolver.tudelft.nl/uuid:cbf46287-0d6e-4765-9592-960685f8d848","Summary of Results from the NOAA Shale Oil and Natural Gas Nexus (SONGNEX) Study","de Gouw, J.A. (Cooperative Institute for Research in Environmental Sciences); Warneke, C. (NOAA Chemical Sciences Division); Trainer, M. (NOAA Earth System Research Laboratory); Peischl, J. (NOAA Chemical Sciences Division); Ryerson, T.B. (NOAA Chemical Sciences Division); de Bruin, Joep (Student TU Delft); Levelt, Pieternel Felicitas (TU Delft Atmospheric Remote Sensing); Veefkind, Joris Pepijn (Royal Netherlands Meteorological Institute (KNMI)); Vlemmix, T. (TU Delft Atmospheric Remote Sensing)","","2018","In March and April of 2015, the NOAA WP-3D research aircraft made airborne measurements over several different oil and natural gas production regions in the central and western U.S. ranging from North Dakota to Texas. The study was conducted at a time when the domestic production of natural gas was at an all-time high and the production of crude oil near an all-time high, but also when drilling activity had abruptly decreased due to a drop in the price of oil. In this presentation, we will give a summary of the measurement results obtained in the different production regions. Emission fluxes of greenhouse gases (CH4) and air pollutants (VOCs, NOx, air toxics) were determined through mass balance and from enhancement ratios versus methane. While photochemistry was generally weak during the flights, some trace gases showed evidence for secondary formation. Measurements by mass spectrometry showed the presence of some less commonly observed trace gases including nitrogen heterocyclic compounds. Emissions of pollutants are expressed as a fraction of the produced natural gas and crude oil. Such metrics can be compared with emission factors for fossil fuel combustion by other sources (motor vehicles and power plants) and allow a comparison of emissions from different stages in the lifecycle of fossil fuels. We have also studied NOx emissions from oil and natural gas production through trend analysis of the NO2columns from the Ozone Monitoring Instrument. This analysis shows that the drilling of new wells and the extraction of crude oil and natural gas both lead to NOx emissions. These results are compared with a new fuel-based emission inventory for NOx emissions from oil and natural gas production.","","en","abstract","","","","","","Abstract A33C-04 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: A33C Emissions of Atmospheric Pollutants from Oil, Gas, and Coal Operations I","","2019-06-12","","","Atmospheric Remote Sensing","","",""
"uuid:39cfab3d-5259-421f-bc9c-993560598dd4","http://resolver.tudelft.nl/uuid:39cfab3d-5259-421f-bc9c-993560598dd4","Response of an Infinite Beam on a Locally Inhomogeneous and Non-linear Winkler Foundation Excited by a Constant Moving Load","Faragau, Andrei B. (TU Delft Dynamics of Structures); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2018","Transition radiation is emitted when a source moves along a straight line with constant velocity and acts on or near an inhomogeneous medium [1,2]. Transition radiation occurs, for example, when a train crosses an inhomogeneity in the railway track, such as a transition in foundation stiffness. As the velocity of the trains becomes closer to the wave velocity in the subsoil, wave radiation is amplified and may cause plastic deformation in the transition zone.
Studies of transition radiation in finite one-dimensional systems with non-linear
foundation behaviour are available in the literature. However, studies that properly account for the infinite extent of the system are not. To this end, the system composed of an infinite beam resting on a locally inhomogeneous and non-linear Winkler foundation, and subjected to a constant moving load is analysed in this paper. The Winkler foundation is assumed to be piecewise linear, and the system thus behaves linearly between non-linear events. Therefore, the solution can be obtained using a mixed time-frequency method [3]. The use of the Finite Difference Method for the spatial discretization combined with derived non-reflective boundary conditions enables us to simulate the behaviour of an infinite system; the computational domain covers the area with the transition in foundation stiffness. To study the features of the generated wave field in pure form, the load velocity is taken sub-critical, excluding other radiation effects.
Results show that the plastic deformation in the transition zone is a consequence of
constructive interference of the excited free waves and the so-called eigenfield that moves with the load. Increasing the load velocity, decreasing the transition length (i.e., smoothness) and/or increasing the foundation stiffness dissimilarity leads to amplified free wave excitation, and consequently to stronger constructive interference and larger plastic deformation. The model and solution method presented in this paper can be used for preliminary design of transition zones in railway tracks. Given the stiffness jump that has to be bridged and the maximum train velocity, the optimum length of the transition zone can be obtained such that minimum damage results in the railway track.","Moving-load dynamics; Transition radiation; Infinite, inhomogeneous and nonlinear system; Mixed time-frequency method; Non-reflective boundaries","en","abstract","","","","","","Accepted Author Manuscript","","","","","Dynamics of Structures","","",""
"uuid:87df0520-4e38-455e-91e7-3221cda97b81","http://resolver.tudelft.nl/uuid:87df0520-4e38-455e-91e7-3221cda97b81","Observations of Subsurface Meltwater Lake Collapse on an East Antarctic Ice Shelf","Dunmire, Devon R. (University of Colorado); Lhermitte, S.L.M. (TU Delft Mathematical Geodesy and Positioning); Drews, Reinhard (Eberhard Karls Universität Tübingen); Lenaerts, Jan (University of Colorado); Mangel, Adam R. (Colorado School of Mines)","","2018","The presence of meltwater influences Antarctic ice shelf dynamics in a way that is poorly understood. In addition to surface meltwater, subsurface meltwater lakes have been discovered close to the ice shelf grounding line. Drainage and collapse of these subsurface lakes may induce hydrofracturing and poses a potential threat to ice shelf stability. Here, we present direct observations of the near-surface firn and ice shelf structure before and after the collapse of a subsurface meltwater lake near the grounding line of the Roi Baudouin Ice Shelf (RBIS). In February 2016, ground penetrating radar (GPR) data were collected of the subsurface lake, highlighting its depth and extent. Surprisingly, when the field team returned to the site in December 2017 to repeat the GPR surveying, they found that the lake had collapsed. These unique GPR and GPS observations highlight the heterogeneity of the lake structure after collapse and allow us to see structural differences before and after collapse. Continued geophysical monitoring and analysis could provide important information to estimate the volume and hydrodynamics of the interglacial lake (e.g. horizontal vs. vertical drainage). In addition to field data, we use a regional climate model and remote sensing observations to provide an analysis of the climate forcing that may have contributed to the lake collapse. We show that anomalously high surface melting in the summer season of 2016-2017 likely contributed to the collapse. Our results shed light on the impact of subsurface lake collapse on the ice shelf structure, dynamics, and surface height changes, which is essential to understand the impact of meltwater drainage on ice shelf stability.","","en","abstract","","","","","","Abstract C41A-02 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: C41A Advances in Subglacial, Englacial, and Supraglacial Hydrology I","","2019-06-13","","","Mathematical Geodesy and Positioning","","",""
"uuid:35673913-f552-4d31-89c2-3ef400999121","http://resolver.tudelft.nl/uuid:35673913-f552-4d31-89c2-3ef400999121","Young Hydrologic Society (YHS): vision, mission, and strategy","Khatami, Sina (University of Melbourne); Beria, Harsh (University of Lausanne); Claes, Niels (University of Wyoming); van Emmerik, T.H.M. (TU Delft Water Resources)","","2018","The Young Hydrologic Society (YHS) is a grassroots initiative to stimulate the interaction and active participation of early career hydrologists within the hydrological sciences community and beyond. Our vision is to reform hydrologic community towards a more active and inclusive involvement of early career hydrologists. YHS mission is to connect and inform. With YHS, we want to (1) connect early career scientists (ECS) by regularly organizing scientific and professional development sessions/workshops, as well as social events at geoscience conferences e.g. EGU, AGU, and IAHS; (2) inform YHS members about successes/issues of the hydrologic community and the current and future research topics of the field. Social media, such as Twitter, blogs or Facebook have been instrumental for YHS to reach its goals. But we noticed that, even in the era of online communication, face-to-face contact remains to be the most effective way to foster connections globally and raise awareness about our network. Actively participating in workshops, seminars, and roundtable discussions at international conferences requires more resources, but the memories are longer lasting and can be even more meaningful/inspiring than what online posts provides. YHS takes pride in its strategy to diversify and empower National Initiatives (e.g. Canadian YHS) as well as actively collaborate with other ECS networks such as Student Subcommittee of AGU Hydrology Section (H3S), Young Earth System Scientists (YESS) community, and IAHS Early Career Committee. We recommend that diversifying ECS networks, engaging ECS in convening scientific sessions, in addition to expanding ECS-focused workshops/events should be an inalienable component of geoscience conferences.","","en","abstract","","","","","","Abstract ED33E-1133 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: ED33E Early-Career Scientist Networks and Organizations Posters","","2019-06-12","","","Water Resources","","",""
"uuid:8511a3bc-e21c-4993-8438-af7e39c77388","http://resolver.tudelft.nl/uuid:8511a3bc-e21c-4993-8438-af7e39c77388","Marchenko redatuming for multiple prediction and removal in situations with a complex overburden","Staring, M. (TU Delft Applied Geophysics and Petrophysics); Wapenaar, C.P.A. (TU Delft ImPhys/Acoustical Wavefield Imaging; TU Delft Applied Geophysics and Petrophysics)","","2018","Internal multiples can create severe artefacts in seismic imaging, especially when our zone of interest is overlain by a complex overburden. These artefacts can mask structures, which has a strong effect on the interpretation of the image. Therefore, multiple prediction and removal is of significant importance for correct imaging and interpretation in settings with a complex overburden.
We propose an adaptive double-focusing method to predict and subtract the internal multiples that were generated in the overburden. This method is a form of the Marchenko method, that can retrieve the directionally-decomposed Green's functions between virtual sources and virtual receivers anywhere inside the subsurface. The retrieved Green's functions contain all orders of multiple scattering. The method only requires the single-sided reflection response and a smooth velocity model as input. Instead of conventional imaging methods, that assume that the wavefield only consists of single-scattered waves (and thus create imaging artefacts when multiple scattering is present), we now use the multiple-scattered Marchenko wavefields for correct redatuming and imaging.
We apply our method to 2D and 3D field data that were recorded in settings where imaging and interpretation is hindered by a complex overburden. First, we create virtual sources and virtual receivers directly above our zone of interest. Next, we use the retrieved Marchenko wavefields to predict and subtract the internal multiples that were generated in the overburden. Masked structures become visible after multiple removal, which significantly improves the geological interpretability. Therefore, we conclude that the adaptive double-focusing method (Marchenko redatuming) is capable of correctly predicting and removing internal multiples generated in the overburden.","","en","abstract","","","","","","Abstract S24A-03 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: [S24A] Frontiers in Theoretical and Computational Seismology I","","2019-06-11","","","ImPhys/Acoustical Wavefield Imaging","","",""
"uuid:8cd2cb2c-0fa3-4f40-9948-fd853ea80f77","http://resolver.tudelft.nl/uuid:8cd2cb2c-0fa3-4f40-9948-fd853ea80f77","Investigating morphological responses to sediment flux alterations and land use changes in the Mara Wetland, Tanzania","Bregolia, Francesco (IHE Delft Institute for Water Education); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education); Paron, Paolo (IHE Delft Institute for Water Education); McClain, M.E. (TU Delft Water Resources; IHE Delft Institute for Water Education)","","2018","The Mara River is the only perennial river of a vast semi-arid area, including the Mara Serengeti ecoregion in Kenya and Tanzania. The river sustains more than one million inhabitants and millions of wild animals. In its lower reaches, the Mara River forms a wide wetland before flowing into Lake Victoria. The wetland represents a rich ecosystem providing essential services, but it is being threaten by increasing human activities. Farming, grazing, fishing and deforestation to produce charcoal and open new crops have deeply modified the riparian vegetation spatial distribution and the habitat morphology. Additionally, the construction of a new dam is planned immediately upstream of the wetland for irrigation purposes and hydropower.
This work is undertaken to set up a hydro-morphodynamic model to predict the short- and long-term effects of human activities on the Mara Wetland habitat. The model will be a tool to evaluate strategies to mitigate the negative effects of the activities.
The Lower Mara River is poorly gauged and only a few scattered data and observations are available. Therefore, in October - November 2017 (dry period) and May 2018 (wet period) multidisciplinary field work was conducted along a 130 km stretch of the river. An unmanned aerial vehicle (UAV) was used to produce high resolution orthophoto mosaics and digital elevation models of selected areas. The UAV gave topography and ground observations on vegetation type, size and distribution, and other features of unattainable areas. A sonar was used to map the bathymetry of some stretches of river and wetland. River discharge was measured on 4 locations. Bed sediments and water samples were collected from 8 spots to analyse sediment granulometry and suspended sediment concentration. Results suggest that, at wetland inlet, the river is particularly rich in suspended sediment, with measured averaged concentrations of the order of 500 mg L-1 and peaks of 2700 mg L-1. The wetland, thanks to its extent and dense vegetation cover, traps the 90% of the suspended sediments and releases clear waters to the Lake Victoria. The future placement of the dam may have a strong influence: without an adequate management, the dam solid and liquid discharge regulation may further trigger morphological changes and jeopardize the wetland ecosystem.","","en","abstract","","","","","","Abstract B43I-2963 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: B43I The Resilience of Wetland Ecosystems to Multiscale Environmental Changes Posters","","2019-06-13","","","Environmental Fluid Mechanics","","",""
"uuid:8d374430-41ee-4f29-b537-fdb46f08499d","http://resolver.tudelft.nl/uuid:8d374430-41ee-4f29-b537-fdb46f08499d","Evaluating and improving ice sheet clouds, radiation, and precipitation in the Community Earth System Model","Lenaerts, Jan (University of Colorado); Camron, Michael D. (University of Colorado); Kay, Jennifer E. (University of Colorado); van Kampenhout, Leo (Universiteit Utrecht); Gettelman, Andrew (University Corporation for Atmospheric Research); L'Ecuyer, Tristan (University of Wisconsin-Madison); Souverijns, Niels (Katholieke Universiteit Leuven); Izeboud, Maaike (Student TU Delft); Lhermitte, S.L.M. (TU Delft Mathematical Geodesy and Positioning)","","2018","Clouds exert a pivotal control on the mass balance of the Greenland and Antarctic Ice Sheet and therefore their contribution to global sea level. Clouds transport moisture onto the marginal ice sheet, where steep topographic gradients force the air to rise and cool, inducing strong orographic precipitation and leaving the interior ice sheet dry (polar desert). Clouds further regulate the radiation balance at the surface and, consequently, surface melt. Depending on their frequency, phase, and structure, clouds not only mute incoming solar radiation but also enhance longwave radiation at the surface. With the advent of novel observations from space (CloudSat-CALIPSO) and in the field, we now have tools to start evaluating the representation of clouds, precipitation, and ice sheet surface radiation in climate models. Here we evaluate the Community Earth System Model version 1 (CESM1(CAM5)) to represent (1) precipitation frequency and phase, using a CALIPSO cloud simulator; (2) cloud radiative effect comparing to a CloudSat-CALIPSO based product; and (3) snowfall amounts and surface mass balance, comparing to CloudSat, in-situ observations, and regional climate model results. After discussing outstanding cloud biases in CESM1(CAM5), we present our efforts to reduce these in the recently released version 2 (CESM2). We show that clouds are considerably better represented in CESM2, leading to improvements in surface radiation, melt, and surface mass balance, although biases in precipitation phase persist. Our work demonstrates the need for high-quality, long-term observations of clouds and their effect on the ice sheet surface to enable continued climate model improvement.","","en","abstract","","","","","","Abstract A53D-03 presented at 2018 Fall Meeting, AGU, Washington, D.C., 10-14 Dec. Session: A53D Polar Atmospheric Processes and Their Interactions with Land, Ice, and Ocean I","","2019-06-16","","","Mathematical Geodesy and Positioning","","",""
"uuid:728d04d0-8916-4381-bb2c-dfd968a022a7","http://resolver.tudelft.nl/uuid:728d04d0-8916-4381-bb2c-dfd968a022a7","Green’s function method for analyzing the response of an infinite Euler-Bernoulli beam on inhomogeneous elastic foundation interacting with a moving oscillator","Mazilu, Traian (Politehnica University of Bucharest); Faragau, Andrei B. (TU Delft Dynamics of Structures); Lu, T. (TU Delft Railway Engineering); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2018","","Track transition zone; Euler-Bernoulli beam; Green’s function method","en","abstract","","","","","","","","","","","Dynamics of Structures","","",""
"uuid:653fe3df-924a-4b66-8293-fc2747636e73","http://resolver.tudelft.nl/uuid:653fe3df-924a-4b66-8293-fc2747636e73","Transition radiation in an infinite beam supported by a locally inhomogeneous and non-linear Winkler foundation","Faragau, Andrei B. (TU Delft Dynamics of Structures); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2018","","Moving-load dynamics; Transition radiation; Infinite, inhomogeneous and nonlinear system; Mixed time-frequency method; Non-reflective boundaries","en","abstract","","","","","","","","","","","Dynamics of Structures","","",""
"uuid:5c59a0a6-1999-4b7a-8ff5-993894a82dc3","http://resolver.tudelft.nl/uuid:5c59a0a6-1999-4b7a-8ff5-993894a82dc3","Interaction Between a Moving Oscillator and an Infinite Beam on Elastic Foundation with Transition Zone in Stiffness – Green’s Function Approach","Mazilu, Traian (Politehnica University of Bucharest); Faragau, Andrei B. (TU Delft Dynamics of Structures); Lu, T. (TU Delft Railway Engineering); van Dalen, K.N. (TU Delft Dynamics of Structures)","","2018","Transition zones in railway lines are areas between different track structures such as the transition from conventional track (ballasted track) to slab track, to a tunnel or a viaduct. The main feature of a transition zone is that it exhibits a dramatic change in structural behaviour to bridge the difference in the adjacent track parts. This change causes high dynamic loads which contribute to quality deterioration of the track. Two main factors influence the magnitude of the interaction forces between trains and track in transition zones. Firstly, the abrupt change in track stiffness. This stiffness is determined by the mechanical features of the entire track structure; the conventional track is a compliant structure, while slab track, tunnels and viaducts are relatively stiff. A train passing a stiffness change induces a variation of track
deflection under the moving dead loads and, consequently, also a variation in the wheelset’s vertical momentum leading to higher (dynamic) loads. Secondly, settlements of the backfill and its foundation are typically larger than those of stiff structures, leading to unevenness of the track. This abstract deals with the issue of the dynamic analysis of an infinite Euler-Bernoulli beam on elastic foundation with transition in foundation stiffness, subjected to a moving oscillator. This model is one of the simplest ones for a vehicle passing a transition zone. The equations of motion are solved by means of the time-domain Green’s function method using convolution integrals in terms of the unknown contact force. Considering the
track as an aperiodic structure, the Green’s functions (receptances) are calculated in a stationary reference frame (i.e., non-moving sources). Two methods of solution are investigated. The first one is based on the Laplace Transform, where the response consists of a contribution from the initial conditions and one from the moving contact force. By choosing the initial conditions in accordance with the response of a beam with homogenous foundation subjected to a moving load, the free vibrations and waves due to oscillator entrance are suppressed and steady-state behaviour is achieved before the oscillator reaches the transition zone. The second method is based on the Fourier Transform, which automatically ensures this
steady-state behaviour. Both methods are exemplified in the paper. The influence of the length of the transition zone and the speed of the moving oscillator on the contact force are analysed; both sub-critical and super-critical speeds are considered.","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Dynamics of Structures","","",""
"uuid:32c3ddff-fe90-4351-aef6-f0866dc361b6","http://resolver.tudelft.nl/uuid:32c3ddff-fe90-4351-aef6-f0866dc361b6","Assessment of ionospheric corrections for PPP-RTK using regional ionosphere modelling","Psychas, D.V. (TU Delft Mathematical Geodesy and Positioning; Fugro); Verhagen, S. (TU Delft Mathematical Geodesy and Positioning); Liu, X. (Fugro); Memarzadeh, Y. (Fugro); Visser, H. (Fugro); Teunissen, P.J.G. (TU Delft Mathematical Geodesy and Positioning; Curtin University of Technology)","","2018","","","en","abstract","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:d2688b6c-b8c2-491b-8993-e00627fafa78","http://resolver.tudelft.nl/uuid:d2688b6c-b8c2-491b-8993-e00627fafa78","Topology optimization with overhang filter considering accessibility of supports","van de Ven, E.A. (TU Delft Computational Design and Mechanics; Royal Netherlands Aerospace Centre NLR); Langelaar, Matthijs (TU Delft Computational Design and Mechanics); Ayas, C. (TU Delft Computational Design and Mechanics); Maas, Robert (Royal Netherlands Aerospace Centre NLR); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2018","","Topology Optimization; Additive Manufacturing; Accessibility of supports","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:4149ddc1-d80e-41fc-aec7-251024d35ab6","http://resolver.tudelft.nl/uuid:4149ddc1-d80e-41fc-aec7-251024d35ab6","Multistable mechanical metamaterials for 3D positioning","Zhang, Y. (TU Delft Computational Design and Mechanics); Wang, Q. (TU Delft Computational Design and Mechanics); Tichem, M. (TU Delft Micro and Nano Engineering); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2018","","multistability; metamaterials; positioning","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:7563f494-bfb6-4b30-9c2b-d639a8939204","http://resolver.tudelft.nl/uuid:7563f494-bfb6-4b30-9c2b-d639a8939204","Membranic Disjunction: Beyond Digital Parts and Analog Wholes","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2018","","","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:830cdb04-2ee8-43e4-8df6-226aeb3b96ee","http://resolver.tudelft.nl/uuid:830cdb04-2ee8-43e4-8df6-226aeb3b96ee","Athenian Technicities and Urban Black Holes","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2018","","","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:213adc1d-4eb0-47a9-8da9-180c08f0b6aa","http://resolver.tudelft.nl/uuid:213adc1d-4eb0-47a9-8da9-180c08f0b6aa","How to apply the capability approach to housing policy?: Concepts, theories and challenges","Kimhur, Boram (TU Delft Urban Development Management)","","2018","This paper investigates to what extent the capability approach can contribute to housing studies and policy development. The capability approach, pioneered by economist-philosopher Amartya Sen and philosopher Martha Nussbaum, is built upon critical reviews on the norms of welfarism and utilitarianism, and argues that social policy and its evaluative approach need to move beyond them. Social policies have largely focused on material means such as income and wealth or subjective categories such as satisfaction and preferences. In contrast, the capability approach emphasises that the focus should be placed at expanding people’s opportunities and abilities to achieve the things – beings and doings – that they value, instead of limiting to resources or subjective feelings. Traditionally, housing policy studies have deeply been rooted in the norms of the welfare state, welfare economics and its philosophical foundation of utilitarianism. What implications for housing studies can we draw from the capability approach? The paper explores this topic and presents a conceptual discussion on how the capability approach can be applied to the studies on housing policy and its evaluative framework. It will critically review mainstream evaluative approaches in housing policy, and commonly used informational bases, such as the total number of dwellings supplied, housing quality, housing satisfaction and housing affordability, which have been the core indicators to assess overall housing performance. According to the capability approach perspective, the mainstream evaluative approaches tend to ignore other important aspects, such as distribution matters, diversity of human beings and values, and non-utility concerns such as moral issues, rights, and justice. The central concerns of housing policy need to include to what extent a policy expands people’s opportunities and abilities to pursue their housing process, by removing obstacles that people face in the process. In other words, it needs to examine what opportunity and ability deprivations a household has in her process towards achieving the housing – or state of well-dwelling – that she has reason to value. This may include not only the access to finance and land, but also, for instance, access to proper information, gender equality, real human rights, and opportunities for being a stakeholder in the decision-making process of residential area planning. The paper discusses missing perspectives in housing policy studies and preliminary concludes that a capability-oriented housing policy framework could have an added value. The discussion in this paper remains at a theoretical and methodological level. The paper primarily aims to provide a theoretical foundation for further research on defining specific multi-dimensional deprivations in one’s housing process, so that these can be used for evaluating the impact of housing policies. This clearly is a big challenge. However, we think there is great promise in adapting the methods that are used in other scholars’ research in different domains such as health, education, employment and multi-dimensional poverty.","Housing policy; utilitarianism; welfare economics; evaluative approach; capability approach","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:893bde55-d695-4d37-a8e4-b1ac45164f76","http://resolver.tudelft.nl/uuid:893bde55-d695-4d37-a8e4-b1ac45164f76","Comparative case studies of housing and welfare outcomes by using the capability approach","Kimhur, Boram (TU Delft Urban Development Management)","","2018","This presentation summarises the research proposal for developing a model for applying the capability approach to housing studies, and testing the model through a case study in Manila. The conceptual framework of this research lies in a comparative analysis of key theoretical approaches to well-being in the field of welfarism, planning and development: i.e. utilitarian and capability approach. Welfare-housing framework has deeply been rooted in welfarism and utilitarianism. They have been dominant in analysing housing outcomes as well as designing housing policies for low-income groups and the poor. Meanwhile, in development studies, the capability approach has substantially influenced on the research of poverty and well-being, and also on policy recommendations. The capability approach, pioneered by economist-philosopher Amartya Sen, claims that social policy framework and its evaluative approach should move beyond the norms of welfarim and utilitarianism. This research proposes to examine the extent to which the housing policies/programmes in Manila are linked to or influenced by utilitarian and capability approach, and to analyse each policy or programme’s impact on households’ well-being. It first examines what dimensions of capabilities are relevant to housing. Based on the findings, it evaluates the impact of housing programmes on the capabilities identified, and thus eventually well-being of the urban poor. This research aims to examine the applicability of the capability approach and its contributing value to welfarism-oriented practices that are dominant in housing policy and planning field. The case study – a model test – plans to conduct a comparative study of three settlements in Manila, in which public housing, slum upgrading, and community-driven housing programmes have been implemented. The research expects to reveal what aspects are missing or fulfilled in different housing approaches for enhancing the urban poor’s capabilities and well-being, and thus to be able to provide a recommendation for housing policy development as well as its effectiveness evaluation.","capability approach; housing policy; urban poor; well-being; welfarism; utilitarianism","en","abstract","","","","","","","","","","","Urban Development Management","","",""
"uuid:f72d4fb1-c88c-437c-b512-7214139f068a","http://resolver.tudelft.nl/uuid:f72d4fb1-c88c-437c-b512-7214139f068a","A fully coupled hydro-mechanical framework for expansive clays","Dieudonné, A.A.M. (TU Delft Geo-engineering); Charlier, Robert (Université de Liège)","","2018","","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Geo-engineering","","",""
"uuid:8e31b593-3c98-4ed1-a52e-2f244d187f24","http://resolver.tudelft.nl/uuid:8e31b593-3c98-4ed1-a52e-2f244d187f24","Credibility of Formalization: A Renewed Attempt at Forest Titling in Southwest China","Krul, K. (TU Delft Organisation & Governance)","","2018","Formalization has regained popularity in development discourses. Also in China significant efforts of titling are witnessed in the forestry sector. Although initial efforts date back nearly four decades ago, since 2008 a renewed attempt under the Collective Forest Tenure Reform (CFTR) has been introduced. This paper examines whether this instance has contributed to a more credible institutional arrangement of forest tenure. To assess how the reform’s formal objectives are aligned with local state capacities and interests, as well as with farmers’ needs and preferences, it applies the Formal, Actual, Targeted (FAT) institutional framework. Primary data are drawn from a survey (N= 331) in the Wuling Mountain Area (covering four provinces of Southwest China), accompanied by 30 semi-structured interviews with local officials and village cadres. Findings suggest that the reform initially appears credible, as the title is issued and deemed important by both farmers and authorities. However, variation in the implementation and outcomes of the reform have pointed to an institutional compromise that is manifested through nonconforming practices and negligence of local factors. Likened to previous rounds of forest reform, the most recent instance failed to address long-standing issues immanent to China’s forest tenure. The forest certificates have emerged as an ‘empty’ institution, and future changes in the use and value of forest could easily dampen the reform’s efforts and credibility. These findings suggest that caution should be exercised before introducing a land titling program and point to a need for more context-specific approaches to formalization.","Formalization; Titling; Forest Reform; Credibility; FAT institutional framework","en","abstract","","","","","","","","","","","Organisation & Governance","","",""
"uuid:4ee980ff-2f21-4d50-9427-95b824d45434","http://resolver.tudelft.nl/uuid:4ee980ff-2f21-4d50-9427-95b824d45434","Demonstration of a Computationally Efficient Method for Stacking Sequence Blending of Composite Laminates","van Campen, J.M.J.F. (TU Delft Aerospace Structures & Computational Mechanics); van den Oord, Ellen (Student TU Delft)","","2018","Stacking sequence optimisation can be used to increase the strength or stiffness of a composite laminate, or to reduce its weight subject to a strength or stiffness constraint. Optimisation of larger composite structures consisting of multiple panels may result in stacking sequences of adjacent panels that are incompatible with one another. The act of enforcing stacking sequence continuity to ensure structural integrity and manufacturability of a laminated composite laminate is known as blending. This term was first introduced by Zabinsky (1994). In literature, many methods can be found to implement structural continuity by means of stacking sequence blending in one way or another. The complexity of the problem makes the blending of a structure with a large number of adjacent design regions, and thus stacking sequences, prohibitive. This work introduces a computationally efficient method for stacking sequence blending of composite laminates. The presented method is inspired by cellular automata (CA) and relies on the application of a set of simple rules to solve the blending problem. The presented method is demonstrated using the benchmark 18-panel horseshoe blending problem, Soremekun et al. (2002). Each panel is initialized using a genetic algorithm (GA). The result is fed into the CA-scheme. The obtained results are equal to or better than those reported in the literature and were obtained requiring very little operations. This can be attributed to the increased design space of the presented method compared to literature. The computational efficiency makes the presented method especially interesting for composite structures with a large number of design regions. An outlook on the scalability of the presented method and its limits will be given. Soremekun, G. A., Gürdal, Z., Kassapoglou, C. and Toni, D. (2002), ‘Stacking sequence blending of multiple composite laminates using genetic algorithm’, Composite Structures 56(1), 53–62. Zabinsky, Z. B. (1994), ‘Global optimization for composite structural design’, Monthly technical progress report, under contracts NAS1-18889 (report No. 58) and NAS1-20013, task 2 (report 4).","","en","abstract","","","","","","","","","","","Aerospace Structures & Computational Mechanics","","",""
"uuid:f1363e49-669f-4c54-8309-e26172901d5b","http://resolver.tudelft.nl/uuid:f1363e49-669f-4c54-8309-e26172901d5b","Impact of Solubilized and Dispersed Crude Oil on Foam in a Porous Medium","Hussain, A.A.A. (TU Delft Applied Geophysics and Petrophysics); Vincent-Bonnieu, Sebastien (Shell Global Solutions International B.V.); Kamarul Bahrim, R.Z. (Petronas Research); Rossen, W.R. (TU Delft Reservoir Engineering)","","2018","Dispersed and solubilized oil can impact bulk foam stability differently. Though aromatic components are more soluble in water than straight-chain aliphatic components, solubilized aromatics do not necessarily impact bulk foam stability, whereas straight-chain aliphatic components can have a detrimental impact (Lee et al., “Stability of Aqueous Foams in the Presence of Oil: On the Importance of Dispersed vs Solubilized Oil”, Ind. Eng. Chem. Res., 52,pp. 66−72, 2013). However, to our knowledge there is no research on the impact of solubilized oil on foam in porous media.
The impact of the crude oil, as a separate oleic phase, was studied by co-injection of crude oil, surfactant solution and gas in coreflood, on steady-state mobility, captured by the pressure drop across the core. To investigate if the behaviour of steady-state foam with dispersed crude oil can be explained by the solubilized oil components, we perform foam-flooding experiments with surfactant solution previously equilibrated with crude oil. Furthermore, we conduct foam-flooding experiments with solubilized hexane in surfactant solution, to determine if the straight-chain aliphatic components can explain the behaviour of the solubilized crude oil on steady-state foam mobility as it impacts bulk foam in the literature.
The crude oil , as a separate oleic phase, reduces the pressure gradient across the core by a factor of twenty compared to the case without oil. Nonetheless, this pressure gradient was about a factor three higher than we observed by co-injecting crude oil, water without surfactant, and gas, which indicates that some weak foam and emulsion was generated by co-injecting surfactant, crude oil, and gas. In contrast, with solubilized crude oil and with solubilized hexane, the pressure gradient is in the same order of magnitude for co-injection gas and surfactant with and without solubilized oil. These results indicate that solubilized crude oil cannot explain the impact of the crude oil as a separate oleic phase on foam mobility in our case. Furthermore, the impact of solubilized crude oil on steady-state foam mobility cannot be explained as the effect of a solubilized straight-chain aliphatic component such as hexane.
The major result of our work is that the impact of solubilized crude oil on foam does not explain the detrimental impact of crude oil in a separate oleic phase on foam in a porous media. Another result is that though co-injected water, gas and crude oil might not generate strong foam, it can result in somewhat higher pressure gradients with surfactant in the aqueous phase than without surfactant. This is possibly caused by smaller oil droplets in presence of surfactant and a weak foam.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:08c92c05-c96a-4ca0-a9b9-953f119a4671","http://resolver.tudelft.nl/uuid:08c92c05-c96a-4ca0-a9b9-953f119a4671","Impact of surfactant depletion on foam in porous media","Hussain, A.A.A. (TU Delft Applied Geophysics and Petrophysics); Vincent-Bonnieu, S.Y.F. (TU Delft Reservoir Engineering); Rossen, W.R. (TU Delft Reservoir Engineering)","","2018","","Foam; EOR; surfactant concentration","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:784e3069-4662-4b7f-a679-26f6bcc53ca1","http://resolver.tudelft.nl/uuid:784e3069-4662-4b7f-a679-26f6bcc53ca1","Estimating the Impact of Bird Strikes","Metz, I.C. (TU Delft Control & Simulation; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Muhlhausen, Thorsten (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Ellerbroek, Joost (TU Delft Control & Simulation); Hoekstra, J.M. (TU Delft Control & Simulation)","","2018","Bird strikes have the potential to cause severe damage to aircraft. Therefore, measures to reduce the risk of bird strikes are performed at airports. However, this risk is not limited to the airport but is increased in the arrival and departure corridors as well. Consequently, a significant amount of bird strikes occurs outside the direct airport area. To estimate the risk of bird strikes in this extended airport area, a fast-time simulation environment was developed, representing air traffic as well as bird movement. It was verified by performing Monte-Carlo Simulations including real flight plans, a model for realistic bird movements and a comparison to real bird strike data.
In this study, the simulation results were evaluated considering the impact of bird strikes. For this purpose, the kinetic energy of the bird strikes that occurred within the simulation was calculated. Based on the international certification requirements for the impact resistance of engines, windshields and structure, the potential for severe damage was analysed. Finally, the results were compared to a long-term study of damaging bird strikes of the US aviation authorities. The results indicate that the simulation environment allows a reasonable estimation of the damaging potential of bird strikes. The simulation data derives from the Netherlands, while the real bird strike data originates from the US. For further validation and enhancement of the simulation’s bird model, European data from multiple years would be required.","","en","abstract","","","","","","","","","","","Control & Simulation","","",""
"uuid:8f4a968b-f6a9-4083-a4e0-bc977b47f79d","http://resolver.tudelft.nl/uuid:8f4a968b-f6a9-4083-a4e0-bc977b47f79d","IFUP: Workshop on Multi-dimensional Information Fusion for User Modeling and Personalization","Zhu, Feida (Singapore Management University); Zhang, Yongfeng (Rutgers University); Yorke-Smith, N. (TU Delft Algorithmics; American University of Beirut); Guo, Guibing (Northeastern University); Chen, Xu (National Tsing Hua University)","","2018","Recommendation system has became an important component in many real applications, ranging from e-commerce, music app to video-sharing site and on-line book store. The key of a successful recommendation system lies in the accurate user/item profiling. With the advent of web 2.0, quite a lot of multimodal information has been accumulated, which provides us with the opportunity to profile users in a more comprehensive manner. However, directly integrating multimodal information into recommendation system is not a trivial task, because they may be either homogenous or heterogeneous, which requires more advanced method for both fusion and alignment. This workshop aims to provide a platform for discussing the challenges and corresponding innovative approaches in fusing multi-dimensional information for user modeling and recommender systems. We hope more advanced technologies can be proposed or inspired, and also we hope that the direction of integrating different types of information can catch much more attention in both academic and industry.","Information fusion; Multi-dimensional; User modeling","en","abstract","","","","","","","","","","","Algorithmics","","",""
"uuid:ca90c782-36ce-4513-899c-ef530835b6c5","http://resolver.tudelft.nl/uuid:ca90c782-36ce-4513-899c-ef530835b6c5","Use of multiway Partial Least Squares Regression (N-PLS) as model emulator to quantify climate change induced uncertainty in future marine chlorophyll-a concentrations","Mészáros, L. (TU Delft Statistics); van der Meulen, F.H. (TU Delft Statistics); Jongbloed, G. (TU Delft Delft Institute of Applied Mathematics); El Serafy, G.Y.H. (TU Delft Mathematical Physics)","","2018","Traditionally, quantifying climate change induced uncertainty in ecological indicators requires stochastic simulation with a chain of physically-based models describing various processes such as hydrodynamics, waves, sediment transport and ecology. Such Monte Carlo based simulation on the entire model chain, especially with large sample size, is however computationally expensive and often unfeasible. In this paper, it was investigated how regression models can potentially replace physically-based models and predict chlorophyll-a concentration directly from meteorological variables. Since several correlated meteorological variables are used to estimate one ecological response variable, and thus a multi-collinearity problem is present, Partial Least Squares (PLS) regression is considered to be a favourable supervised technique. On the other hand, the climate change projection dataset at hand is multidimensional. This is due to the fact that it contains several variables which are not only varying over time but also over space (spatially distributed). Consequently, a multiway regression model should be applied which can account for the spatial dimension. The multiway PLS regression (N-PLS) algorithm is a promising candidate for this purpose. The N-PLS is an extension of the ordinary two-way PLS regression algorithm to multi-way data, where essentially the bilinear model of predictors is replaced with a multilinear model. In order to test its efficiency, the N-PLS algorithm was compared with other unsupervised and supervised, two-way and multi-way techniques using both synthetic and real datasets. The latter dataset consists of meteorological variables from KNMI (Royal Netherlands Meteorological Institute) and chlorophyll-a concentrations obtained from the Delft3D WAQ ecological model. Firstly, it was confirmed that supervised techniques should be favoured over unsupervised ones, due to their ability to include correlation to the response variable which reduces prediction error. Moreover, the results suggest that by applying multi-way methods improvements can be achieved in the prediction accuracy. The magnitude of these improvements is, however, case dependent. In conclusion, it was found that N-PLS, as a supervised multi-way method, is a promising regression model for the above mentioned purpose. Finally, due to the fast simulation time of the algorithm, it could be suitable for stochastic simulation with large sample size for the assessment of climate change induced uncertainty in coastal ecosystem indicators. Future work will focus on applying the fitted N-PLS model to EURO-CORDEX climate change projections and quantify related uncertainties in the Wadden Sea ecosystem.","","en","abstract","","","","","","","","","","","Statistics","","",""
"uuid:ea6baa28-aa72-44f7-9e72-891f98d3a9fe","http://resolver.tudelft.nl/uuid:ea6baa28-aa72-44f7-9e72-891f98d3a9fe","Is Hyperloop helpful in relieving the environmental burden of long-distance travel?: An explorative analysis for Europe","van Goeverden, C.D. (TU Delft Transport and Planning); Janic, M. (TU Delft Transport and Planning); Milakis, D. (TU Delft Transport and Planning)","","2018","Long-distance travelling accounts for a significant and increasing part of the mileage of person travel and the respective environmental impacts (Van Goeverden et al, 2016). Energy consumption and emissions connected with long-distance travelling might be substantially reduced through use of evacuated tubes of low air resistance, such as the recently proposed Hyperloop transport system (HL). This paper explores the extent to which a fully developed HL network system in Europe could reduce energy consumption and GHG emissions of long-distance passenger transport.","","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:070b83bf-28f0-43d6-b620-668b4ed04d32","http://resolver.tudelft.nl/uuid:070b83bf-28f0-43d6-b620-668b4ed04d32","Adding value through stakeholder processes in integrated coastal management and sea port development in data-poor environments","Vreugdenhil, H.S.I. (TU Delft Policy Analysis; Deltares); Slinger, J (TU Delft Policy Analysis); de Boer, W.P. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ker Rault, PA (Wageningen University & Research); ottow, bouke (Deltares); Giardino, Alessio (Deltares); Briere, Christophe (Deltares)","","2018","A867
Sustainable port development and integrated coastal management (ICM) require: (i) ecosystem-based or integrated design, (ii) a future orientation, (iii) stakeholder-inclusive processes. Stakeholder-inclusive processes, the focus of this paper, increase the diversity of knowledge and the availability of information, and expand the pool of creativity in a development initiative. As such, they address the bounded rationality of a single actor or group of actors with limited information on their coastal (port) system and limited ability to explore and process all potential options for such a system. Stakeholder participation is also considered ‘good governance’, and forms an inherent component of ICM. In this paper we investigate the added value of stakeholder-inclusive processes conducted in the scoping phases of several coastal and port projects in data-poor environments. We evaluate 5 cases: Sustainable port development in Tema (Ghana), ICM in Sao Tome, ICM in Guinee for the island of Kaback, for Grand Bassam (Ivory Coast),and Richards Bay/ Mhlatuze in terms of 7 categories of added value, namely:
1. Data collection/ Ground-truthing: biogeophysical and social aspects
2. System understanding: governance, social and biogeophysical aspects
3. Insight in past and current actions/ strategies
4. Eliciting problem perceptions, values and priorities
5. Developing new solutions/ Creativity: changing scale, issues involved, future visions
6. Process design preferences: who should be involved, how and when
7. Increased support for new coastal and port development strategies.
Overall, we determine that although scoping was the primary focus of the cases, the participatory processes contributed to generating potential solution options, and preparing for evaluation and decision making. The range of potential solution options broadened– more issues were identified, and the fit with the local needs improved. The added value of the participatory process is clarified further by comparing with earlier non-participatory initiatives in some of the case studies. Then, the implemented ‘solutions’ came as a surprise to the local community as stakeholders were not engaged, nor informed about the measures that were implemented.
Finally, the lessons learned from the case studies regarding the added value of stakeholder inclusive approaches within the scoping phase of ICZM and seaport development projects are linked explicitly to data poor situations. In particular, we find indications that data gathering and ground-truthing and developing a shared system understanding and insights on the effects of past and present actions, are particularly valuable.","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:1ee2b473-7142-495c-8e2d-f7dbf66762b5","http://resolver.tudelft.nl/uuid:1ee2b473-7142-495c-8e2d-f7dbf66762b5","How to prepare your River Studies Data for the future with 4TU.Centre for Research Data","Boehmer, J.K. (TU Delft Research Data and Software); Duinker, R.M.E. (TU Delft Research Data and Software); Bentum, M (University of Twente)","","2018","Due to the latest funder requirements on data management and Open Data, documenting and managing research data during the research and preparing it for publication gained in importance. Making research data findable and accessible for decades via a trusted and certified data archive – such as 4TU.Centre for Research Data – and therefore enabling the interoperability and reusability of its content can positively impact the future of river studies.","data management; FAIR data; data archive","en","abstract","","","","","","","","","","","Research Data and Software","","",""
"uuid:c0c60845-70f5-44ca-97cb-b39d6e5a8286","http://resolver.tudelft.nl/uuid:c0c60845-70f5-44ca-97cb-b39d6e5a8286","A transfer-free approach to wafer-scale graphene deposited by chemical vapour deposition","Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Ricciardella, F. (TU Delft Electronic Components, Technology and Materials); Romijn, J. (TU Delft Electronic Components, Technology and Materials); Singh, M. (TU Delft Photovoltaic Materials and Devices); Shi, Shengtai (Student TU Delft); Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials)","","2018","","","en","abstract","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:6afeed6c-2517-4df0-892e-737aafddf1f8","http://resolver.tudelft.nl/uuid:6afeed6c-2517-4df0-892e-737aafddf1f8","Making large free-standing multi-layer graphene/graphitic membranes","Kurganova, Evgenia (ASML); Giesbers, A.J.M. (Philips Innovation Services); Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Notenboom, Arnoud (ASML); Vles, David (ASML); Nasalevich, Maxim (ASML); van Zwol, Peter (ASML)","","2018","","","en","abstract","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:f1bb5682-f88d-4067-9839-e236823ac3b1","http://resolver.tudelft.nl/uuid:f1bb5682-f88d-4067-9839-e236823ac3b1","Development of two-beam femtosecond/picosecond CARS for high-fidelity thermometry in flames","Bohlin, G.A. (TU Delft Flight Performance and Propulsion)","","2018","We develop simultaneous ultrafast CARS thermometry and species detection as a unique tool to investigate combustion modes with reduced emissions of NOx, particulates, CO and unburned hydrocarbons. Coherent anti-Stokes Raman spectroscopy (CARS) has been developed over the last 4 decades for various gas-phase-, plasma-, flame- and combustion applications and is referred to as the “gold standard” for nonintrusive spectroscopic measurements in harsh environments. It is the combination of excellent chemical selectiveness, i.e. the ability in targeting distinct quantum states of individual molecular species, and the coherent properties of the generated signal beam, which makes this technique very powerful. For most of the gas-phase applications, with rapidly changing events ranging from μs to ms, there is a constraint in performing instantaneous measurements and is beneficially fulfilled by the inherent property of the Raman process. It is the time-duration of the probe pulse which ultimately limits the temporal resolution, where today existing techniques, implemented with ultrafast laser systems operate around or even below collision lifetimes. Still, while a reacting flow is fully characterized in three-dimensional space, a limitation of CARS has been its main applicability as a point-wise measurement technique. Establishing ultrafast CARS for single-shot imaging, however, requires designing robust schemes for both the signal generation and the signal detection. Because the physical scalars quantifying an event in a reacting flow exist only for an instantaneous moment of time, laser-scanning or sample-rastering procedures may not be employed. Here we discuss two-beam femtosecond/picosecond CARS relevant for 0D, 1D, and 2D temperature measurements in flames, and we show that single-shot quantitative measurements for major species in combustion are within reach.","Atomic and molecular physics; Nonlinear optics; Ultrafast optics; Laser diagnostics","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:9db3f589-0fba-42f4-ace8-4c117fc6c143","http://resolver.tudelft.nl/uuid:9db3f589-0fba-42f4-ace8-4c117fc6c143","Flame-wall interaction at enhanced turbulence intensities as characterized by ultrafast 1d-cars thermometry","Bohlin, G.A. (TU Delft Flight Performance and Propulsion); El Sioufy, Karim (Student TU Delft); Jainski, C. (Technische Universität Darmstadt); Patterson, B.D. (Sandia National Laboratories, California); Dreizler, A (Technische Universität Darmstadt); Kliewer, C. J. (Sandia National Laboratories, California)","","2018","In practical combustion-based devices, such as internal combustion (IC) engines and gas turbines for power generation, there exists significant interaction between gas-phase combustion and metal surfaces. The nature of this heterogeneous interaction is complex, involving both physical and chemical effects. The metal surface is generally much cooler than impinging flames, and significant heat flux to the metal wall ensues during the flame–wall interaction (FWI). In this work, we investigate FWI in the side-wall quenching canonical configuration obtained with two-beam femtosecond/picosecond 1D-CARS thermometry. The experiments are performed using a generic burner where the turbulence intensities are significantly enhanced by the employment of a turbulence generator grid (blockage 45%). Previously, these operating conditions have only been well-characterized at quasi-stationary conditions (Re = 5000) [Bohlin, A., Jainski, C., Patterson, B.D., Dreizler, A., Kliewer, C.J.: Multiparameter spatiothermochemical probing of flame–wall interactions advanced with coherent Raman imaging. Proc. Combust. Inst. 36, 4557–4564 (2017)]. In these new experiments, complex interplay between the laser diagnostic and the turbulent combustion in the near wall region is overcome, and data is produced, for instance, on the maximum instantaneous temperature gradients versus the position of the flame-front near the wall as determined with direct thermometry contour analysis.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:978040d4-978d-4e0c-8fe7-723ccb448b81","http://resolver.tudelft.nl/uuid:978040d4-978d-4e0c-8fe7-723ccb448b81","A Blockchain-based Micro-Economy of Bandwidth Tokens","de Vos, M.A. (TU Delft Dataintensive Systems); Pouwelse, J.A. (TU Delft Dataintensive Systems)","","2018","A challenging problem in decentralized systems is encouraging long-term cooperative behaviour between strangers. It is often not immediately bene_cial to cooperate without the guarantee of direct reciprocity. Cooperation among entities in the long term results in sustainability while sel_sh behaviour can lead to the collapse and distrust of such communities. This collapse is also referred to as the tragedy-of-the-commons phenomena and is notoriously hard to prevent when considering mutual access to resources [2]. Our aim is to incentivize network participants in _le-sharing communities to cooperate with each other by introducing monetary rewards for good behaviour. We explore whether a _le-sharing ecosystem based on band- width tokens is capable of addressing the tragedy-of-the-commons and increase cooperation and sustainability in general. Blockchain technology is used to achieve tamper-proof accounting of such bandwidth tokens. While blockchain is often used to securely maintain digital currencies without _nancial institutions, our goal is to deploy a distributed ledger to promote cooperation amongst content providers and consumers. Based on this goal, we designed a blockchain with superior scalability, compared to existing blockchain solutions [4]. A high-level system architecture of our micro-economy is presented in Figure 1. The key component of our design is a bandwidth token, irrefutably stored and tracked on our deployed blockchain fabric: TrustChain [4]. TrustChain is speci_cally designed to build trust between interacting strangers and has no hard requirement for global consensus, in comparison to popular blockchain applications. Instead, consensus is reached between transacting parties and fraud is guaranteed to be eventually detected by the means of network gossiping. In contrast to existing blockchains like Bitcoin or Ethereum, each user creates and grows their own chain of transactions [3]. Every transaction in TrustChain is dual-signed and stored in the chains of both transacting parties. Our approach yields superior scalability while signi_cantly reducing storage requirements. Content providers are able to mine or earn bandwidth tokens by uploading content to others using our decentralized _le sharing client Tribler [1]. Token mining is an autonomous process that attempts to optimize the amount of uploaded data by _rst downloading and then uploading a subset of available content. Mining is both bene_cial for the provider, who earns spendable tokens, and the community, where contributed bandwidth results in faster downloads and increased availability of content. Content consumers pay providers for their provided resources with bandwidth tokens. When the di_erence between the amount of uploaded and downloaded bytes (the token balance) of a speci_c user is below a certain threshold, content providers refuse to upload content to these peers, until they contributed a su_cient amount of bandwidth back to the community. This basic but e_ective free-riding policy makes bandwidth tokens usable and ensures that there is a basic demand for them. We address privacy issues arising from sharing content with a deployed and tested Tor-like communication overlay. When this overlay is enabled, an end-to-end encrypted path is constructed with other nodes and tra_c is routed through these nodes. This allows peers to interact with the community in an anonymous way. In contrast to Tor, the anonymous layer as implemented in Tribler is fully decentralized and does not rely on centralized (directory) servers. The system o_ers anonymity at the cost of increased bandwidth requirements","blockchain; cooperation; micro-economy; bandwidth; currency","en","abstract","","","","","","","","","","","Dataintensive Systems","","",""
"uuid:2881779b-a516-4160-b0f1-8e619c68ead6","http://resolver.tudelft.nl/uuid:2881779b-a516-4160-b0f1-8e619c68ead6","We Should Stop Claiming Generality in Our Domain-Specific Language Papers","Harkes, D.C. (TU Delft Programming Languages)","","2018","Our community believes that new domain-specific languages should be as general as possible to increase their impact. However, I argue that we should stop claiming generality for new domain-specific languages. Instead, we should document how domain-specific language based software development is beneficial to the overall software development process.","Domain-specific languages; domain-specific languages; scientific rhetoric","en","abstract","","","","","","","","","","","Programming Languages","","",""
"uuid:731df946-b05b-44f6-a2c1-e7c20f559619","http://resolver.tudelft.nl/uuid:731df946-b05b-44f6-a2c1-e7c20f559619","Ultimate limit state assessment of dyke reliability using the random material point method","Remmerswaal, G. (TU Delft Geo-engineering); Hicks, M.A. (TU Delft Geoscience and Engineering); Vardon, P.J. (TU Delft Geo-engineering)","","2018","This paper investigates embankment reliability based on the ultimate limit state (ULS). The ULS is generally not clearly defined and, especially for flood defences, the ULS is currently under discussion. According to Dutch law [1], flooding which leads to either casualties or substantial financial damage is considered as the ultimate limit state of a flood defence structure. However, initial slope instability is regarded as flood defence failure according to guidelines for the assessment of macro-instability of dykes [2]. Allowing initial failure, but preventing a dyke breach, is not prohibited by the current Dutch regulations and can lead to more efficient design. Analysis of both large deformations as well as the influence of spatial variability of soil properties is important to assess the reliability of a dyke against breaching. This paper uses a new technique called the random material point method (RMPM) [3], which combines MPM [4] for modelling large deformations, with random fields [5] for modelling soil variability, in a Monte Carlo simulation.","","en","abstract","","","","","","","","","","Geoscience and Engineering","Geo-engineering","","",""
"uuid:f7bf0ad6-074d-4fca-b47a-eac2b5a48d45","http://resolver.tudelft.nl/uuid:f7bf0ad6-074d-4fca-b47a-eac2b5a48d45","A case study on technical and social aspects of earth houses in rural India","Kulshreshtha, A. (TU Delft Applied Sciences); Vardon, P.J. (TU Delft Geo-engineering); Mota, Nelson (TU Delft OLD Woningbouw); van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology); Jonkers, H.M. (TU Delft Materials and Environment)","","2018","Earth houses are considered sustainable and affordable as compared to houses built with concrete or fired clay bricks. Moreover, it preserves the vernacular social and spatial traditions (cultural identity) of the community. With rapid industrialization and the increase in popularity of concrete and brick constructions, a decline in earth houses has been observed especially in the rural areas of India. A survey was carried out in four regions of the country (Himachal, Orissa-Jharkhand, Gujarat, Tamil Nadu) to understand the technical and social factors favouring/limiting the construction and everyday use of earth houses. As an outcome of the survey, two specific but opposing motivations were identified: 1. Lowincome families living in traditional earth houses that aspire for a brick or concrete house and 2. Families that have adopted an alternative and sustainable life-style and prefer living in a “natural habitat”. Although the advantages of mud houses, such as better indoor climate, better affordability, and ease of construction and maintenance were widely acknowledged, limitations with regard to abrasion, poor water-resistance and termite infestation were the major technical drawbacks that motivates the aspiration (for concrete/brick house) of lowincome households. However, the social aspects such as a low societal image of earth houses as compared to modern building materials and comparison with fellow community households were the main reasons behind the choice in favour of modern building material over the earth. The identified negative social and technical aspects place new requirements and demands reinvention of earth house as a necessary step toward their acceptance.","Earth house; Social aspiration; Technical issues; Affordable housing","en","abstract","","","","","","","","","Applied Sciences","","Geo-engineering","","",""
"uuid:2244da38-a331-4bc8-998f-811fbe1f6a8f","http://resolver.tudelft.nl/uuid:2244da38-a331-4bc8-998f-811fbe1f6a8f","Evaluation of REScoop interventions to simulate household energy conservation: Results from a survey in six EU countries","Coenen, Frans (University of Twente); Hoppe, T. (TU Delft Organisation & Governance)","","2018","In recent years cooperatives for renewable energy supply (REScoops) have emerged as important new actors in energy markets. They provide their members (i.e., households) with renewably generated energy within a cooperative model that enables members to co-decide on its strategic and tactical goals, plans and business model. REScoops do not only collectively own renewable energy production facilities and supply this to their members. They also use their specific position as energy suppliers to take several actions to persuade their members (households) to engage in energy conservation. Because of their particular organisational and business model as citizens’ initiatives REScoops are in theory well positioned for activities to influence and help their members conserve energy. This particularly has to do with REScoops being in close proximity of their members, which enables them to intervene and influence social structures and social norms. In a previous paper by the authors arguments were presented why and how REScoops do this, presenting a number of policy measures they engage in to persuade their members to conserve energy. Moreover, a number of measures were discussed that have actually been undertaken by REScoops [1]. Although this study disclosed information on the aims, the working mechanism (‘policy theory’), the scope of, and a few experiences with these measures it revealed little about their impact in terms of household energy savings.
In this paper we tap into this issue and pay attention to the evaluation of a number of measures implemented by REScoops. The main research question therefore is how the implementation of selected policy measures by REScoops is experienced by REScoop members, and whether these measures contribute to (self-) reported household energy savings? The measures that will be assessed in this study include both antecedent strategies (i.e. information, awareness making campaigns, workshops, tailored advice ), consequence strategies (i.e. online platform with feedback on energy consumption, billing ) and combinations of those (i.e. integrated, ‘package approaches’ ).
The research of this paper is based on a survey conducted in the period of March-July 2018, among seven REScoops in six EU nations; i.e. Coopérnico (Portugal), Enostra (Italy), Ecopower (Belgium), Enercoop (France), EBO (Denmark), SEV (Southern Tyrol, Italy) and SOM energia (Spain). It comprises one of the few quantitative studies on REScoops in particular and community energy in general, and is thus far the only one that analyses assesses REScoop interventions, in particular on their influence on household energy conservation behaviour.
The analysis of survey data uses a ‘modus operandi’ approach to reveal evidence vis-à-vis the claim that the measures implemented explain for (self-reported) energy savings among households, and counter evidence to alternative explanations. Following this approach a number ways to assess the impact of the measures implemented by REScoops on energy consumption behaviour by households will be conducted; i.e., energy saving actions undertaken by households, and (self-reported) energy savings among households comparing between experiment and control groups (using independent sample T-tests). In addition, data on perceived contribution of the measure to (self-reported) energy savings, and satisfaction with the measure will be analysed. We also analyse the statistical relation between psychological variables, demographics and household energy conservation (using correlation coefficients analysis). Next to the quantitative analysis of the survey data qualitative insights regarding the implementation of selected REScoop measures will be collected and analysed. Following this triangulation of data we judge whether policy measures implemented by REScoops can be deemed effective interventions to stimulate household energy conservation.
This paper contributes to (a) the growing body of literature on REScoops as emerging actors in the energy domain, (b) to the growing body of literature of social innovation (i.e., social intervention) in energy transitions, and (c) to the body of literature in environmental psychology that studies the impact of different types of intervention strategies on household energy consumption and conservation [2].
The research methodology and results presented in this paper are part of the H2020 - REScoop Plus Project. This project has received funding from the European Union’s Horizon-2020 research and innovation programme under grant agreement No. 696084.
This innovation adoption research identifies key opportunities and barriers for asset managers from a case study that considers changing grid conditions on a university campus in the Netherlands. The case illustrates that implementing energy flexibility is certainly not only a problem of data communication and transfer. The paper sets the scene that asset management for energy flexibility also requires detailed consideration and planning of required technical changes in buildings and grids.
But hypothesis testing can be very misleading if not well understood. To many researchers, especially newcomers, even the simpler analyses and tests are seen as a black box where one puts performance scores and gets a p-value which, as they are told, must be smaller than 0.05. Therefore, significance tests are in part responsible of determining what gets published, what research lines to follow, and what project to fund, so it is very important to understand what they really mean and how they should be carried out and interpreted. We will also focus on experimental validity, and will show how a lack of internal or external validity, even if experiments are reliable and repeatable and hypothesis testing is done correctly, can render even your best results invalid. Problems discussed include adversarial examples or the lack of inter-rater agreement when annotating ground truth data.
The goal of this tutorial is to help MIR researchers and developers get a better understanding of how these statistical methods work and how they should be interpreted. Starting from the very beginning of the evaluation process, it will show that statistical analysis is always required, but that too much focus on it, or the incorrect approach, is just harmful. The tutorial will attempt to provide better insight into statistical analysis of results, present better solutions and guidelines, and point the attendees to the larger but ignored problems of evaluation and reproducibility in MIR.","","en","abstract","","","","","","Accepted author manuscript","","","","","Multimedia Computing","","",""
"uuid:a770fd23-db62-4afa-accd-3c1e5b59dcc4","http://resolver.tudelft.nl/uuid:a770fd23-db62-4afa-accd-3c1e5b59dcc4","Modelling for analysis of refraction effects on overtopping in a complex estuary","Oosterlo, P. (TU Delft Hydraulic Structures and Flood Risk); van der Meer, J.W. (TU Delft Hydraulic Structures and Flood Risk); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); van Vledder, G.P. (TU Delft Environmental Fluid Mechanics)","","2018","","numerical wave modelling; SWAN; Eems-Dollard estuary; field measurements; refraction; wave sheltering; wave-wave interactions; numerical diffusion; diffraction","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:03cd30a3-a69d-4a28-9a6b-c20687f09412","http://resolver.tudelft.nl/uuid:03cd30a3-a69d-4a28-9a6b-c20687f09412","LDA analysis of swirling flow in a hydro turbine draft tube","Shtork, Sergey I. (Novosibirsk State University); Litvinov, Ivan V. (Novosibirsk State University); Gorelikov, Evgeny Y. (Novosibirsk State University); Mitryakov, Andrey S. (Novosibirsk State University); Hanjalic, K. (TU Delft ChemE/Transport Phenomena)","","2018","The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the pressure recording by wall-mounted acoustic sensors for a selection of operating conditions reveal different patterns of the swirling flow, with clearly identifiable regimes with the maximum flow pulsations at non-optimal operating conditions. The regimes with distinct precessing vortex cores show notable rearrangement of the velocity fields, accompanied by an increase in the amplitude of the pressure pulsations, as confirmed by the peaks of the spectra of pressure signals from wall-mounted microphones.","Automated LDA; Rapid prototyping; Hydro turbine draft tubes; Precessing vortex core (PVC)","en","abstract","","","","","","","","","","","ChemE/Transport Phenomena","","",""
"uuid:2fa151aa-872e-46a1-96b4-4b5989efd673","http://resolver.tudelft.nl/uuid:2fa151aa-872e-46a1-96b4-4b5989efd673","Characterizing Dynamic Stress Sensitive Fracture Apertures in A DFN Representation: An Example From the Island of Pag (Croatia)","Prabhakaran, R. (TU Delft Applied Geology); Bruna, P.B.R. (TU Delft Applied Geology); Bertotti, G. (TU Delft Applied Geology); Mittempergher, S. (University of Milano-Bicocca); Succo, A. (University of Parma); Bistacchi, A. (University of Milano-Bicocca); Storti, F. (University of Parma); Meda, M. (External organisation)","","2018","Improving the understanding of fluid flow through fracture networks is crucial to the optimum recovery of hydrocarbons in naturally fractured reservoirs. In explicit dual continuum representations of matrix and fractures, it is not just the intensity of fracturing and the topological relationships in the network but also connectivity of hydraulically open fractures that determines effective permeability of the system. Fractured folds often form prolific reservoirs owing to the structural closure they afford and the additional porosity and permeability due to the fold related fracturing. The fracture patterns are of specific interest owing to the complex geometries associated with folding. In this work we utilize a combined outcrop based and numerical approach to characterize fracture patterns, fracture apertures and fluid flow sensitivities using a folded ‘box-type’ anticlinal structure example from the Pag Island, Croatia. The Pag Island is part of the main Adriatic-Dinaridic Carbonate Platform in the External Dinarides region that persisted from the Triassic to the Eocene with Paleocene-Miocene Dinaridic deformation phases. The current day geology consists of up to 1 km thick Cenomanian - Senonian shallow water rudists bearing carbonates and about 650m thick Eocene-Oligocene Nummulitic carbonate successions. We present a 3D structural model of the Pag Island with a Discrete Fracture Network (DFN) digitized representation built from drone photogrammetry. The multiscale fracture patterns in this multilayer folded reservoir analog are classified on the basis of folding stages (pre-, syn-, post folding). FEM geomechanical modeling is used to quantify stress-sensitive heterogeneous fracture apertures with the Barton-Bandis empirical model. Permeability sensitivities of the fracture network are tested using coupled single phase fluid flow and poroelasticity simulations. The results show that hydraulic apertures are extremely sensitive to fracture orientation with respect to the shortening direction and reservoir pressure transients. Our novel approach for coupled flow & geomechanics simulations yields effective permeability tensors that are functions of both matrix and fracture conductivities and also fracture aperture variations in time. We test dynamic closure & dilation of fractures in depletion and injection scenarios and our results stress the importance of dynamic fracture apertures in structurally complex fractured reservoirs.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:aa8d6737-8e05-4af9-834d-952f257eefea","http://resolver.tudelft.nl/uuid:aa8d6737-8e05-4af9-834d-952f257eefea","Multiscale 3d Prediction Of Fracture Network Geometry And Fluid Flow Efficiency In Folded Carbonate Reservoir Analogues; Case Study Of The Island Of Pag (Croatia)","Bruna, P.B.R. (TU Delft Applied Geology); Bertotti, G. (TU Delft Applied Geology); Mittempergher, Silvia (University of Milano-Bicocca); Succo, Andrea (University of Parma); Bistacchi, Andrea (University of Milano-Bicocca); Storti, Fabrizio (University of Parma); Meda, Marco (ENI)","","2018","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:5885871d-b891-4105-a65c-8692649ee772","http://resolver.tudelft.nl/uuid:5885871d-b891-4105-a65c-8692649ee772","Structural style and deformation patterns in folded carbonate platform units: the case study of Pag anticline, External Dinarides, Croatia","Succo, Andrea (University of Parma); Mittempergher, Silvia (University of Milano-Bicocca); Bistacchi, Andrea (University of Milano-Bicocca); Mozafar, Mahtab (University of Parma); Bruna, P.B.R. (TU Delft Applied Geology); Balsamo, Fabrizio (University of Parma); Storti, Fabrizio (University of Parma)","","2018","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:259ea083-7bac-43d8-a4c5-34e79cc001e6","http://resolver.tudelft.nl/uuid:259ea083-7bac-43d8-a4c5-34e79cc001e6","Deformation pattern in the thrust-related Parmelan Anticline (Bornes Massif, Subalpine Chains, Haute-Savoie, France): preliminary results","Berio, Luigi (University of Parma); Balsamo, Fabrizio (University of Parma); Mittempergher, Silvia (University of Milano-Bicocca); Mozafar, Mahtab (University of Parma); Storti, Fabrizio (University of Parma); Bistacchi, Andrea (University of Milano-Bicocca); Bruna, P.B.R. (TU Delft Applied Geology); Bertotti, G. (TU Delft Applied Geology)","","2018","","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:84476b8c-d2b3-48b2-b343-cd4a07808e80","http://resolver.tudelft.nl/uuid:84476b8c-d2b3-48b2-b343-cd4a07808e80","Types of Energy Consumers in Offices","Kwon, M. (TU Delft Climate Design and Sustainability); Remøy, H.T. (TU Delft Real Estate Management)","","2018","The building sector accounts for more than one-third of the total primary energy use and has significant potential for energy saving [1]. However, various physical and social factors affect the energy performance of dynamic systems, such as the indoor climate condition, the building envelope, maintenance, building equipment, operation, and occupant behaviour [2, 3]. Particularly human factors contribute to a high variance in energy consumption [4]. The occupant is a major leading factor for energy use in buildings, since building systems run to provide comfortable working environments for occupants. Many studies have used kWh/m2 /year to compare energy use of buildings [5]. However, the energy use also needs to be measured by occupancy schedule and density of building users [6-8] how many people work in an office; how many hours do they stay inside. The objective of this study is to investigate how much the energy use per person is different before and after office renovation towards energy efficiency, and to identify user types according to occupancy schedule and whether energy use differs between users.","User types; Office building; Office renovation; Workplaces; Energy efficiency","en","abstract","","","","","","","","","","","Climate Design and Sustainability","","",""
"uuid:648a2278-047b-435e-a61c-727ff6705d16","http://resolver.tudelft.nl/uuid:648a2278-047b-435e-a61c-727ff6705d16","Predictive mechanical model for fracture stimulation in an enhanced geothermal system (EGS) context","Lepillier, B.P. (TU Delft Reservoir Engineering); Bruhn, D.F. (TU Delft Reservoir Engineering; Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences); Daniilidis, Alexandros (TU Delft Reservoir Engineering); Bruna, P.B.R. (TU Delft Applied Geology); Bakker, R.R. (TU Delft Reservoir Engineering)","","2018","","","en","abstract","","","","","","Accepted Author Manuscript","","","","","Reservoir Engineering","","",""
"uuid:267deddf-8825-4b24-acd3-a4bf5275072a","http://resolver.tudelft.nl/uuid:267deddf-8825-4b24-acd3-a4bf5275072a","Modelling orbital climate signals in fluvial stratigraphy","Wang, Y. (TU Delft Applied Geology); Abels, H.A. (TU Delft Applied Geology); Storms, J.E.A. (TU Delft Applied Geology); Martinius, A.W. (TU Delft Applied Geology; Statoil Research Centre)","","2018","There are certain orbital cycles influencing the relative position and location of the earth towards the sun, resulting in the cyclic insolation received on the earth, which causes climate changes and subsequent environmental response in the catchment, including precipitation, temperature, and vegetation, and so on. Furthermore, such catchment responses induce cyclic variation of source materials, including sediment supply and water discharge in the entry of a fluvial basin. Climate change related to the 21-kyr precession cycle was proposed as the driver of regularly-alternating river avulsion and overbank phases in the Eocene Willwood Formation, Bighorn Basin, Wyoming, USA 1-2. This study aims to simulate the building-up process of fluvial stratigraphy under the action of precession.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:822544a8-9098-4802-bfdc-be2229e2465d","http://resolver.tudelft.nl/uuid:822544a8-9098-4802-bfdc-be2229e2465d","Sediment deposition and preservation in mouth bar complexes of prograding deltas","van der Vegt, H. (TU Delft Applied Geology); Storms, J.E.A. (TU Delft Applied Geology); Walstra, D.J.R. (TU Delft Coastal Engineering; Deltares); Li, L. (TU Delft Applied Geology); Nordahl, Kjetil (Statoil Research Centre); Martinius, A.W. (TU Delft Applied Geology; Statoil Research Centre); Howes, N.C. (Shell)","","2018","In deltaic deposits, the largest volumes of sandy deposits occur at the delta top (as channel accretion, overbank deposits) and as distinct or amalgamated sandy mouth bars in the upper delta front. We use process-based models to study the sediment distribution in four evolving deltas, each with a different input sediment profile. We show how the mouthbar deposits can preserve a large proportion of the sand preserved in the sedimentary record of deltaic systems.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:628262a8-b839-40d1-8f5e-9721b09d6119","http://resolver.tudelft.nl/uuid:628262a8-b839-40d1-8f5e-9721b09d6119","Modelling astronomical climate signals in fluvial stratigraphy","Wang, Y. (TU Delft Applied Geology); Storms, J.E.A. (TU Delft Applied Geology); Martinius, A.W. (TU Delft Applied Geology; Equinor ASA); Abels, H.A. (TU Delft Applied Geology)","","2018","Orbital climate forcing is demonstrated to result in cyclic changes as reflected in the catchment, including precipitation, temperature, vegetation, sediment supply and water discharge. All of these are known to largely impact alluvial architecture. Climate change related to the 21-kyr precession cycle was proposed as driver of regularly-alternating river avulsion and overbank phases in the Eocene Willwood Formation of the Bighorn Basin, Wyoming, USA (Abels et al. 2013; 2016). This study aims to explore the conditions that are favourable for these climate cyclic signals to be preserved in the fluvial stratigraphy.","","en","abstract","","","","","","","","","","","Applied Geology","","",""
"uuid:44da4f2f-d7f3-4b90-8086-bfbbf5952824","http://resolver.tudelft.nl/uuid:44da4f2f-d7f3-4b90-8086-bfbbf5952824","A Convolutional Neural Network-Based Model for Predicting The Perceived Attractiveness of Urban Places","Psyllidis, A. (TU Delft Web Information Systems); Choiri, Hendra Hadhil (Student TU Delft)","","2018","An understanding of how people perceive attractive or unattractive places in cities is vitally important to urban planning and policy making. Given the subjective nature of human perception and the ambiguous character of attractiveness as an attribute of urban places, it is challenging to quantify and reliably assess the extent to which a place is perceived as attractive or not. It is even more difficult to do this at scale. This research proposes a novel machine learning approach to quantifying and predicting the perceived attractiveness of urban places. It introduces a predictive model, employing a Convolutional Neural Network (CNN), to automatically estimate the attractiveness of places in cities, based on their Google Street View representation. A set of street-level images (four consecutive images make up the panoramic overview of each place) with similar daylight conditions and level of complexity (e.g. amount of people present in a scene) is assessed by means of crowdsourcing, drawing on attractiveness-related factors identified in environmental psychology studies. Using these judgments as ground truth, in combination with a new CNN architecture, the model automatically assesses the perceived attractiveness of any place in a city, by rating them on the basis of a five-point Likert scale score. Moreover, it identifies features of the urban environment that could influence positively or negatively the overall attractiveness of a place. The resulting accuracy of 55.9% and root-mean-square error of 0.70 illustrate that the model holds promise as a scalable and reliable tool for estimating the perceived attractiveness of urban places.","predictive urban analytics; machine learning; convolutional neural networks; urban attractiveness; spatial data science","en","abstract","","","","","","","","","","","Web Information Systems","","",""
"uuid:ef9e8c29-89da-4f37-8eb2-414425c4a995","http://resolver.tudelft.nl/uuid:ef9e8c29-89da-4f37-8eb2-414425c4a995","Building with nature in wetlands: Plants accelerate soil forming processes of newly deposited fine sediments","Dekker, Stefan (Universiteit Utrecht; Open University of the Netherlands); Saaltink, Remon (Universiteit Utrecht); de Boer, Hugo (Universiteit Utrecht); Barciela Rial, M. (TU Delft Environmental Fluid Mechanics); van Kessel, Thijs (Deltares); Griffioen, Jasper (TNO; Universiteit Utrecht); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics); Wassen, Martin (Universiteit Utrecht)","","2018","","","en","abstract","","","","","","Geophysical Research Abstracts Volume 20","","","","","Environmental Fluid Mechanics","","",""
"uuid:724d3e5d-a5ba-43c0-93a2-0f019c7e4b89","http://resolver.tudelft.nl/uuid:724d3e5d-a5ba-43c0-93a2-0f019c7e4b89","Optimization modeling of regional energy systems considering coordination mechanisms","Wang, N. (TU Delft Energie and Industrie); Heijnen, P.W. (TU Delft Energie and Industrie); Verzijlbergh, R.A. (TU Delft Energie and Industrie); Kunneke, R.W. (TU Delft Economics of Technology and Innovation); Herder, P.M. (TU Delft Energy Technology; TU Delft Energie and Industrie)","","2018","Dutch regional municipalities increasingly take an active role in the transition to more sustainable and autonomous energy supply systems, using local energy sources like wind, solar and biomass. The ambition, on the one hand, concerns how an optimal local energy supply system can be designed such that local energy targets can be realized with minimum dependence on the national energy grids. On the other hand, it is of importance to consider the coordination mechanisms between actors such as municipalities, local communities and grid operators, since they will influence the technical configuration of the system. In the literature about renewables-based regional energy systems, the technical optimizations are done mostly from a central planner point of view. Therefore, there lacks a study on the optimization models for regional renewable energy planning that has a comprehensive view on coordination mechanisms and their influence on the system performance. The objective of this work is to enhance the formulation of for self-sufficient regional energy systems by taking coordination mechanisms into account, in order to understand their influences on the system performance. In this paper, a toy model for making optimal long-term investment decisions in electricity generation and transmission will be presented. Two coordination mechanisms, namely one with a central planner, and the other one with a regional market, are considered. In addition, the different modeling approaches for rural and urban energy systems will be discussed. Initial results show that the coordination with a central planner has the least system cost. In the market-based coordination, it is recognized that the degree of shared information and of market participation influences the problem formulation. This results in the cost differences for different coordination mechanisms and for different actors, and thus gives policy implications in the choice of coordination mechanisms and in cost allocation.","Renewable energy sources; regional energy system modeling; optimization methods; coordination mechanisms","en","abstract","","","","","","","","","","","Energie and Industrie","","",""
"uuid:0f35144a-1fbd-4332-9183-d9c71201b9cc","http://resolver.tudelft.nl/uuid:0f35144a-1fbd-4332-9183-d9c71201b9cc","Real -Time Mining: Sensors for materials characterization","Desta, F.S. (TU Delft Resource Engineering); Buxton, M.W.N. (TU Delft Resource Engineering); van der Werff, Harald (University of Twente); Dalm, M. (TU Delft Resource Engineering)","","2018","Sensors are being used as laboratory and in-situ techniques for characterization and definition of raw material properties. However, application of sensor technologies for underground mining resource extraction is very limited and highly dependent on the geological and operational environment. In our study the potential of RGB imaging, Fourier-Transform Infrared Spectroscopy (FTIR) spectroscopy and Hyperspectral imaging for the characterization of polymetallic sulphide minerals in a test case of the Reiche Zeche underground mine was investigated.
sanitation chain (Moriarty et al., 2011; Fonseca et al., 2011).","","en","abstract","","","","","","","","","","","Sanitary Engineering","","",""
"uuid:3a2b9139-7d75-4ad9-8edf-2d1c9bc17981","http://resolver.tudelft.nl/uuid:3a2b9139-7d75-4ad9-8edf-2d1c9bc17981","Facts over feelings: How citizens evaluate responses to uncertainties about power lines","de Vries, G. (TU Delft Organisation & Governance); de Bruijn, J.A. (TU Delft Multi Actor Systems)","","2017","","","en","abstract","","","","","","","","","","Multi Actor Systems","Organisation & Governance","","",""
"uuid:8348ff6f-8bbe-4ee9-9f33-058ee9226a2b","http://resolver.tudelft.nl/uuid:8348ff6f-8bbe-4ee9-9f33-058ee9226a2b","Intensification of biobased chemicals manufacturing","de Haan, A.B. (TU Delft ChemE/Transport Phenomena)","","2017","","","en","abstract","","","","","","","","","","","ChemE/Transport Phenomena","","",""
"uuid:a44ee904-b373-40bb-9ed9-a5ebec4e6205","http://resolver.tudelft.nl/uuid:a44ee904-b373-40bb-9ed9-a5ebec4e6205","Analysis of Sedimentation in the Guayas River at Guayaquil, Ecuador","Barrera Crespo, P.; Becker, A; Ottevanger, W.; Nabi, M.; Giardino, A; de Keizer, O; Arias Hidalgo, M.E.; Sanchez, D.; Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Pazmiño Nelson, N.","","2017","The Equatorian Daule and Babahoyo rivers combine into the tidal Guayas River with the largest estuary on the Pacific coast of South America. The city of Guayaquil, located along the Guayas, is the main port of Ecuador but at the same time the planet’s fourth most vulnerable city for future flooding due to climate change, after Guangzhou, Mumbai and Kolkata. Fluvial sedimentation is seen as one of the factors contributing to the risk of flooding. It increases water levels, it blocks the drainage from urban flooding and water treatment plants, it deteriorates navigation conditions, and it produces a mid-channel bar called “Islota del Palmar”. This bar attracts birds that hinder air traffic around the nearby airport. The growth of this bar pushes currents against the erodible bank along the Samborondón residential area. Sedimentation rates have increased in recent years, which is locally perceived as a result of deforestation in the upper catchment. The planning and design of effective mitigation measures, however, require a more precise understanding of what causes sedimentation. Therefore we carried out a systematic analysis using the new flexible-mesh version of the Delft3D modelling system. We found that sedimentation in the Guayas has no relation with upstream deforestation. Rather, the sediment originates from the downstream estuary instead of the upstream catchment. This complies with the presence of marine sands in the river as reported by a dredging company. We could explain the import of sediment from the asymmetry of the tide, and the recent increase in sedimentation rates to land reclamation and to a decrease of episodic flushing by river floods due to upstream dam construction. Only the deposition of silt and clay in connected stagnant water bodies could perhaps be ascribed to upstream deforestation. These insights will guide the planning and design of effective solutions.","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:9d4355a2-dfa7-4d15-95f0-aace062668bf","http://resolver.tudelft.nl/uuid:9d4355a2-dfa7-4d15-95f0-aace062668bf","Stabilization of the Brahmaputra-Jamuna-Padma-Meghna River corridor, Bangladesh","Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Aminul Haque, A.M.; Klaassen, G.; Sarker, Maminul Haque (Center for Environmental and Geographic Information Services); Shahjahan Siraj, Md.; Islam, M.","","2017","The main rivers of Bangladesh are boon and bane for the country. They supply water and fertile sediments allowing multiple crops per year, hundreds of waterways for navigation, rich fish stock and habitat diversity. But especially the dynamic, unpredictable Brahmaputra influenced rivers erode fertile floodplain land with long established settlements, flood embankments, roads, and all other communal infrastructure. The high sediment load and resulting continuous shifting of river courses impedes navigation and the inflows into the important distributary offtakes. Stabilization of these largest and most unpredictable rivers on the planet presents a huge challenge. Bangladesh has systematically developed the technology and experience to stabilize longer reaches of riverbanks and has commenced towards a holistic approach to stabilizing the Brahmaputra System from the Assam border to the Bay of Bengal. Current developments are concentrated in the Flood and Riverbank Erosion Risk Management Investment Program, from which we present three recent key developments. First, we demonstrate phased gradual stabilization of the 60 km reach just upstream of the confluence with the Ganges following an adaptive approach, responding to massive riverbank erosion but also seizing the opportunities offered by the rivers during particular years towards systematic stabilization and land reclamation. Second, we show how an array of morphological prediction methods and mathematical models, developed over the past 25 years, is used for the planning and the design of interventions for stabilization. Third, we demonstrate our experiences with an innovative construction method for long guiding revetments, consisting of sand-filled geo-textile bags under water. Additionally, we discuss the feasibility, costs, benefits, environmental impacts and social impacts of river stabilization also with special attention to the pivoting role of stable distributary offtakes in the context of a wider river management plan.","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:38f0e80e-d410-43fb-b7ef-c501485502a8","http://resolver.tudelft.nl/uuid:38f0e80e-d410-43fb-b7ef-c501485502a8","Modelling in applied hydraulics: More accurate in decision making than in science?","Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)","","2017","Marked differences occur between modelling in scientific hydraulic research, in hydraulic engineering and in public decision making. This study reviews ifferences in the required accuracy of model results and differences in the choice between physical and numerical modelling. Physical models are used for studying elementary processes and their interactions under controlled conditions in scientific research; for the planning and design of interventions in hydraulic engineering; and for explanation and demonstration in public decision making. Numerical models are powerful tools in scientific research, butfield applications cannot be verified or validated according to rigorous scientific standards. Hydraulic engineers use numerical models for various purposes, some requiring a high accuracy and some not. They are used to uncertainty and deal with this by means of sensitivity analyses or probabilistic approaches. Numerical models are also used for decision making on interventions that affect stakeholders, sometimes even having the last word in corresponding protocols or legislation. The suggested or perceived accuracy of model results is in this context much higher than the real accuracy. This leads to the paradoxical situation that decision makers and stakeholders put higher demands on accuracy than scientists do.","Physical modelling; numerical modelling; validation; design flood levels","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:ce9b02e1-cf03-4c3d-a89e-50f0fe1ef0cb","http://resolver.tudelft.nl/uuid:ce9b02e1-cf03-4c3d-a89e-50f0fe1ef0cb","Requirements and Game Ideas for Social Interaction in Mobile Outdoor Games","Fonseca, Xavier (TU Delft System Engineering); Lukosch, S.G. (TU Delft System Engineering); Lukosch, H.K. (TU Delft Policy Analysis); Tiemersma, S.A. (TU Delft Organisation & Governance); Brazier, F.M. (TU Delft System Engineering)","","2017","Challenging neighbourhoods in large cities most often lack social coherence. Meaningful social interaction between citizens in such neighbourhoods is needed to increase coherence, and games may be a means to this end. This paper reflects on the structure of a dedicated game design workshop with teenagers from 12 to 16 years of age designed to this purpose. The relevance of both the identified requirements and the emergent game ideas are presented and discussed together with directions for future work for design of games for social interaction through participation.","Mobile outdoor games; Social interaction; Requirements; Meaningful interaction","en","abstract","","","","","","","","","","","System Engineering","","",""
"uuid:5c376488-3a64-4cdf-a03b-7c27073d7cb6","http://resolver.tudelft.nl/uuid:5c376488-3a64-4cdf-a03b-7c27073d7cb6","Quantitative microbial risk assessment for an indoor swimming pool with chlorination compared to a UV-based treatment","Peters, M.C.F.M. (TU Delft Sanitary Engineering); Keuten, M.G.A. (TU Delft Sanitary Engineering; Hellebrekers Technieken); de Kreuk, M.K. (TU Delft Sanitary Engineering); Vrouwenvelder, J.S. (TU Delft BT/Environmental Biotechnology); Rietveld, L.C. (TU Delft Water Management); Medema, G.J. (TU Delft Sanitary Engineering)","","2017","Aims Most swimming pools use residual disinfectants like chlorine for disinfection. The use of chlorine has several drawbacks: some waterborne-pathogens are chlorine resistant and disinfection by-products (DBPs) may be formed which are associated with various health risks. Therefore, an alternative treatment was developed which consists of biological sand filtration, ultra-filtration and UV-disinfection. The goal of this study was to compare the microbial risks for bathers in a UV-disinfected pool compared to a chlorinated pool with the use of a quantitative microbial risk assessment. Methods In this microbial risk assessment, the microbial release was calculated from multiple factors such as pool content, number of simultaneous swimmers, duration and frequency of swimming, ingestion of pool water, the hygienic behaviour of swimmers and the actual release of microbial cells per swimmer. The concentration of faecal bacteria was calculated from shedding experiments and known pathogen concentrations in faeces. The Dutch illness probability (283/1000) was used to calculate the number of infected bathers, which were all assumed to sheds 108 faecal pathogens per g faeces. The used reference pathogens were Campylobacter jejuni, E. coli O157:H7 and Salmonella enterica. The removal of pathogens by treatment with UV-disinfection was set to 5-log units, every 4 hours, while during chlorination these 5-log units are known to be achieved in 30 seconds. The dose-response relationship for E. coli and S. enterica was simulated with a beta-Poisson distribution and for C. jejuni a hypergeometric function was used. The yearly risk of infection was calculated separately for each of the bacterial pathogens and a normal range sensitivity analysis was done. Results The average bacterial cell concentration during opening hours in a UV-based swimming pool were the highest for C. jejuni (3.1×10-3 cells L-1) > S. enterica (9.5×10-4 cells L-1) > E. coli (7.2×10-4 cells L-1). These calculated pathogen concentrations were about 180 times higher than calculated pathogen concentrations in a chlorinated swimming pool in which the averaged concentration was 4.0×10-6 cells L-1 for pathogenic E. coli cells. Based on the average pathogen concentration during opening hours, the yearly risk of infection was calculated to be 9.8×10-8 for the chlorinated swimming pool and 1.8×10-5 for the UV-based swimming pool treatment. The yearly risks of infection of a UV-based treated swimming pool were the highest for C. jejuni (1.7×10-3) > E. coli (1.8×10-5) > S. enterica (3.5×10-7). The simulated yearly risk of infection was found to be most sensitive for the number of bathers releasing pathogens. Conclusions The yearly risks of infection of E. coli and S. enterica in a UV-based treated swimming pool were lower than the drinking water guidelines (10-4), but for C. jejuni it was higher. For a more complete picture of the health risks, the effects of disinfection by-products should also be taken into account in future risk assessments, as is the effect of other pathogens like Pseudomonas, Cryptosporidium and Giardia. UV-based treatment might be a good alternative for chlorination for some specific types of swimming pools.","","en","abstract","","","","","","","","","","Water Management","Sanitary Engineering","","",""
"uuid:3399c2bb-b81d-4c0f-a8e1-e799032ce045","http://resolver.tudelft.nl/uuid:3399c2bb-b81d-4c0f-a8e1-e799032ce045","Microbial quality of swimming pool water with treatment without disinfection, with ultrafiltration, with UV-based treatment and with chlorination","Keuten, M.G.A. (TU Delft Sanitary Engineering; Hellebrekers Technieken); Peters, M.C.F.M. (TU Delft Sanitary Engineering); van Dijk, J.C. (TU Delft Sanitary Engineering); van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology); Rietveld, L.C. (TU Delft Water Management)","","2017","Swimming pools are traditionally disinfected with a residual disinfectant such as sodium hypochlorite. Nowadays, swimming water without a residual disinfectant is increasingly popular, as can be seen by the growing number of (natural) swimming ponds (Weilandt 2015), but health risks for bathers do raise concerns for these type of pools, so some form of disinfection is needed (Giampaoli et al. 2014). The combination of ultra-filtration and UV-disinfection for pool water treatment, without a residual disinfectant might be an interesting alternative. The Dutch Innovative Pool project (DIPool) was initiated to explore this new treatment concept, to study its applicability for swimming pools and to verify first system design specifications. The goals of this study were to compare the microbial water quality during treatment without disinfection, treatment with ultra-filtration, treatment with UV-disinfection, treatment with chlorination, and the influence of single treatment steps.
Methods
All treatment concepts were studied in a pilot plant equipped with a pool basin and simulated bathing load, containing only chemical components. Adenosine triphosphate (ATP) and intact cell count measurements were used to monitor the microbial water quality before and after each treatment step at regular intervals in several experiments during 23 days of operation. High pollutant/nutrient conditions without recirculation were used to study the effect of single treatment steps, and recirculation conditions were used to study the effect of accumulation of pollutants/nutrients. A chlorinated pilot plant was used as reference for the alternative disinfection. The influence of a biological activated carbon filtration during chlorinated conditions was also investigated. Both pilot plants were operated at 1 m3/h, with a turnover time of 30 minutes during the recirculation conditions.
Results
The results showed that the microbial quality of pool water with UV-disinfection was similar to that of chlorinated pool water, while pool water treatment without disinfection resulted in a higher microbial number. After 23 days, most of the results during chlorination and UV-disinfection experiments with recirculation were within 103-105 intact cells/mL and 0.2-13 ng intracellular ATP /L which is similar to both bottled and tap water. Treatment steps with the highest reduction in microbial quality were ultrafiltration (UF) in the treatment setup with UV-disinfection and chlorination in the treatment setup with chlorination. The largest increase in microbial quality was observed during residence in the pool basin, which was obvious, and during biological activated carbon filtration. Most important conclusions were that i) the microbial water quality of pool water with a UV-based treatment can be similar to that of pool water with chlorination ii) UF plays an important role in maintaining a low number of micro-organisms during UV-based treatment and iii) P-limitation is an additional method to limit microbial growth in swimming pool water.
The basis of this study lies in hygiene of swimming pools, where it is argued that taking a pre-swim shower would lead to a decrease in release of pollutants in the swimming pool, which in the end would lead to the decrease of health issues as red eyes and asthma. However, previous research has shown that not even half of the swimming pool visitors takes a pre-swim shower. Therefore, interventions are needed to increase pre-swim shower behaviour. Whereas previous research focused on ‘conscious’ behavioural interventions, this research focuses on ‘unconscious’ behavioural interventions, by using watching eyes. Watching eyes create an unconscious feeling of being watched, which lead people to behave in a prosocial way (for example: people litter less). It is argued that when swimming pool visitors are ‘confronted’ with watching eyes, they are more likely to take a pre-swim shower. So, this study aimed to increase pre-swim shower behaviour in swimming pools by using watching eyes.
Methods
Three interventions were designed, either containing watching eyes, a symbol, or a combination of both (see figure 1). This led to three conditions: eyes-only (no symbol), eyes + symbol, and symbol-only(no eyes). A fourth condition was added in which nothing was displayed (no eyes/no symbol): the control condition. Three methods were used to gather data for this study: observations, questionnaires and water quality measurements. Observations were used to monitor actual pre-swim shower behaviour, and the influence of factors as gender, age, carrying belongings, other people showering, et cetera. These factors were found to influence pre-swim shower behaviour in previous research. Questionnaires were used to monitor hygiene perceptions, importance of hygiene, and hygienic behaviour, and about the awareness and understanding of the interventions. It was expected that data about the factors mentioned before could give more insights about how swimming pool visitors feel about hygiene in swimming pools, and about the influence of the interventions. Finally, water quality measurements were used to monitor the release of pollutants in the swimming pool.
Longitudinal training dams (LTDs) are constructed in the River Waal in the Netherlands. They are aligned parallel to the river shore and divide the river into a main and side channel. The existing groynes are removed yielding more discharge capacity at high flows. The side channel creates possibly a sheltered environment for species compared to the traditional groyne field (Collas, 2014). Although the lay-out of the LTDs has been extensively studied using numerical models (e.g. Huthoff et al., 2011), the morphodynamic response is yet unclear and depends strongly on the dimensions (length and height) of the openings. The inlet and openings (see Fig. 1) are sill-type structures which can be changed relatively easy. These sills are designed in such a way that they serve as a barrier for water and bed load sediment. To make long-term morphological predictions, it is necessary to understand the bed load transport processes over these sills. Suspended sediment transport is not considered in this study. We developed an analytical model to predict sediment transport paths on a slope, using a correction on the well-known critical Shields parameter. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:0b1923b3-ad85-4894-afa3-92a8deac5fe9","http://resolver.tudelft.nl/uuid:0b1923b3-ad85-4894-afa3-92a8deac5fe9","The development of scour holes in a tidal area with heterogeneous subsoil under anthropogenic influence","Koopmans, H. (Deltares); Huismans, Y (Deltares); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics)","","2017","Variable flows and fast morphological changes characterize the river system of Bangladesh, which includes the downstream reaches and delta of the Ganges and Brahmaputra rivers, two of the largest rivers in the world. In contrast, fresh water supply around the country largely depends on much smaller distributaries that take off from those large rivers. With the arrival of the dry season and the drop of water levels in the rivers, some of the distributaries become disconnected during several months from their parent rivers because of aggradation at the offtake during the monsoon season. Analysing the evolution of such offtakes from a morphodynamic perspective is fundamental for the definition of effective measures to prevent their closure. However, bed elevation data required to perform such analyses are rarely available, and bathymetric surveys of large rivers are costly and quickly outdated by fast morphological changes. Physics-based numerical models provide a way to fill the gap of unavailable data, while also allowing to explore river morphodynamics beyond the setting of existing rivers.","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Environmental Fluid Mechanics","","",""
"uuid:00b918ae-db0c-43a4-a1ae-58028ed8cdf0","http://resolver.tudelft.nl/uuid:00b918ae-db0c-43a4-a1ae-58028ed8cdf0","The effect of transverse bed slope and sediment mobility on bend sorting","Weisscher, S.A.H. (Universiteit Utrecht); Baar, A.W. (Universiteit Utrecht); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Kleinhans, MG (Universiteit Utrecht)","","2017","style=""margin: 0cm 0cm 10pt;"">Lateral sorting (= bend sorting) is observed in natural meanders, where the inner and outer bend are fairly fine and coarse, respectively (e.g. Julien and Anthony, 2002; Clayton and Pitlick, 2007). This is caused by the mass differences between grains on a transverse slope, leading to coarser grains being dragged down net more than finer grains (Ikeda et al., 1987). The slope of the transverse bed influences the degree of bend sorting greatly. Also vertical sorting occurs. Grainflows at the lee side of dunes result in a net fining upward trend (Kleinhans, 2005). The degree of vertical sorting depends on flow velocity and sediment mixture characteristics. Most previous studies focused on the development of the transverse slope using small ranges of uniform sediment, so spatial sorting was absent. Yet, it was argued that there is a feedback mechanism between bend sorting and the transverse slope (Ikeda et al., 1987). So, it is of key importance to attain better understanding of how sorting in river bends comes about, which can improve current numerical models. It is the objective of this study to examine experimentally the effect of transverse bed slope and sediment mobility on spatial sorting of bed load in a meander. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Environmental Fluid Mechanics","","",""
"uuid:fb3b02cb-216e-40be-a1d7-6ba8504e5120","http://resolver.tudelft.nl/uuid:fb3b02cb-216e-40be-a1d7-6ba8504e5120","Charging Electric Vehicles from Solar Energy: Integrated Converter and Charging Algorithms","Chandra Mouli, G.R. (TU Delft DC systems, Energy conversion & Storage); Van Der Meer, Dennis (External organisation); Bauer, P. (TU Delft DC systems, Energy conversion & Storage); Zeman, M. (TU Delft Electrical Sustainable Energy); Schijffelen, Jos H. (Power Research Electronics BV); van den Heuvel, Mike (Power Research Electronics BV); Kardolus, Menno (Power Research Electronics BV)","","2017","","Electric vehicles; PV system; EV charging; silicon carbide; smart charging; solar energy; MILP","en","abstract","","","","","","","","","","Electrical Sustainable Energy","DC systems, Energy conversion & Storage","","",""
"uuid:33dca673-675e-420e-9e1a-b30831294b54","http://resolver.tudelft.nl/uuid:33dca673-675e-420e-9e1a-b30831294b54","Analysis of Ribb River channel migration: Upper Blue Nile, Ethiopia","Mulatu, C.A. (IHE Delft Institute for Water Education); Crosato, A. (TU Delft Environmental Fluid Mechanics; Deltares); Mynett, A.E. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education)","","2017","style=""margin: 0cm 0cm 10pt;"">The Ribb River is one of the components of the Blue Nile River system located in the North Western part of Ethiopia. It drains to Lake Tana, the source of the Blue Nile River. The Ribb has a length of 130 km, with a catchment area of 1,812 km2. The average yearly rainfall of the catchment is 1300 mm, with 80 % occurring between the months of June and September. The average and daily maximum discharge of the river are 15 m3/s and 220 m3/s, respectively. A large dam and a diversion weir 30 km downstream of the dam are under construction to irrigate 15,000 ha of Fogera flood plain (WWDSE and TAHAL, 2007). Downstream of the dam location, the Ribb is a meandering river with slope ranging from 0.18% to 0.03%. The river bed material is dominated by sand with a gravel component in its upper reaches. Intensive agriculture without any natural resources conservation, deforestation, dike construction, pump irrigation and sand mining are the most impactful activities in the Ribb watershed (Tarekegn et al., 2010; Garede and Minale, 2014). The Lake Tana level is regulated since 1995 for hydropower production, which enhances flooding along the lower river reach. During the 2006 event, 45 people died, 30,000 persons were displaced and 5371 ha of agricultural land were inundated (ENTRO, 2010). To prevent flooding, dikes have been constructed in the lower reach of the river. This study aims to describe current river morphodynamic trends, including planimetric changes for the definition of the pre-dam conditions of the river. The first part of the work is presented here with some preliminary results, focusing on the river planimetric changes. This paper describes the initial state of the study. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Environmental Fluid Mechanics","","",""
"uuid:6fdf7037-0535-411e-ac5c-6d887716d38b","http://resolver.tudelft.nl/uuid:6fdf7037-0535-411e-ac5c-6d887716d38b","Bank erosion processes in waterways","Duro, G. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Kleinhans, M (Universiteit Utrecht); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education)","","2017","style=""margin: 0cm 0cm 10pt;"">Waterways serve for several functions besides transporting goods and people. The ecological importance of navigable rivers has taken much attention during recent decades bringing efforts to improve these natural corridors for fauna and flora (Boeters et al., 1997). Following the policy of the European Water Framework Directive (WFD), many Dutch river reaches have been recently restored through the removal of bank protections in search for better riparian habitats (Florsheim et al., 2009), but they also result exposed to erosive forces. Large uncertainties generally surround the prediction of erosion rates (e.g. Samadi et al., 2009) due to complex flow characteristics in the near-bank region, variable soil properties, etc. A better understanding of bank erosion processes is then of interest to predict erosion rates and improve the design of future interventions. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:dc2b461b-7341-4986-a0a9-9bde04f6ef1f","http://resolver.tudelft.nl/uuid:dc2b461b-7341-4986-a0a9-9bde04f6ef1f","Sediment transport processes on transverse bed slopes","Baar, A.W. (TU Delft Environmental Fluid Mechanics); Weisscher, S.A.H. (Universiteit Utrecht); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Kleinhans, MG","","2017","style=""margin: 0cm 0cm 10pt;"">We experimentally tested the effect of a largerange in helical flow intensity and sedimentmobility on equilibrium transverse slopes,which resulted in a function for slope effectsdepending on bed state and sedimenttransport mode, that deviates from linearfunctions with sediment mobility in literature.Furthermore, we obtained basic relationsfor sorting patterns as a function of transverseslope and sediment mobility ","","en","abstract","","","","","","Host publication:The 10th Symposium on River, Coastal and Estuarine Morphodynamics, Trento-Padova, 15-22 September 2017, Book of Abstracts Editors: Lanzoni, S., Redolfi, M., Zolezzi, G. ISBN (Print): 978-88-8443-752-5","","","","","Environmental Fluid Mechanics","","",""
"uuid:b93d6639-bcfa-4bd3-b2a7-1da65adc6627","http://resolver.tudelft.nl/uuid:b93d6639-bcfa-4bd3-b2a7-1da65adc6627","Ill-posedness in modelling 2D river morphodynamics","Chavarrias Borras, V. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Ottevanger, W. (Deltares); Labeur, R.J. (TU Delft Environmental Fluid Mechanics); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2017","style=""margin: 0cm 0cm 10pt;"">The set of equations used in modelling river morphodynamics needs to be (at least) wellposed to be representative of the real natural phenomenon. As we deal with a time dependent process the solution needs to be wave-like to be well-posed. In other words, the solution must have a domain of dependence and of influence. Otherwise, the future river state influences the present solution, which is physically unrealistic. Based on an analysis of the system of equations to model one-dimensional river morphodynamics with unisize sediment and a Chezy-based friction term, Cordier (2011) concluded that the system is always well-posed. Stecca (2014) extended the analysis to a mixture of sediment with 2 size fractions and concluded that under degradational conditions the system may become ill-posed. This result supported the first analysis that found ill-posedness in mixedsize sediment morphodynamics conducted by RIbberink (1987) assuming a simpler model. Here we extend these analyses by adding the effects of flow curvature which creates an intrinsically 3D flow referred to as secondary or spiral flow (Van Bendegom, 1947). In this study the flow is assumed bi-dimensional which implies that the secondary flow needs to be parameterized. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:7c2c13e9-8ade-4e4e-b8fa-0ce44a0d36c7","http://resolver.tudelft.nl/uuid:7c2c13e9-8ade-4e4e-b8fa-0ce44a0d36c7","Longitudinal training walls: Optimization of river width subdivision","Le, T.B. (Thuy Loi University); Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics)","","2017","style=""margin: 0cm 0cm 10pt;"">Recently, engineers propose longitudinal training walls to replace traditional transverse groynes. This new intervention is expected to maintain a navigation route under low flow conditions while not hampering flow conveyance of the river channel. Navigation occurs mainly in low-land river channels where the formation of alternate bars constitutes a problem which requires mitigation measures like dredging. Le et al. (2015, 2016) found that the starting point of the longitudinal training wall with respect to a steady bar plays an important role on the stability of the bifurcating parallel channels. Starting at a location near the upstream part of the bar leads to side channel silt up. On the contrary, starting at a location near the downstream part of the bar leads to side channel erosion. The most interesting result was that when the longitudinal training wall starts near the bar top, both channels remain open for a long time. However, these results were obtained only for a specific width ratio, ratio between the width of the side and the width of the original channel, B1/B0 = 1/6, under a constant discharge. In practice, the width ratio may vary to obtain specific achievements. Wang et al. (1995) showed that the width ratio plays an important role on the stability of bifurcating channels. So, how the system behaves for different width ratios under variable discharge remains unclear and needs further investigation. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Environmental Fluid Mechanics","","",""
"uuid:e0e8062b-5bef-453a-b088-f0a403633d35","http://resolver.tudelft.nl/uuid:e0e8062b-5bef-453a-b088-f0a403633d35","Dispersion and dynamically one-dimensional modelling of salt transport in estuaries","Daniels, J.A. (Deltares); Huismans, Y (Deltares); Kuijper, C (Deltares); Noort, J.J. (Deltares); Buschman, F. (Deltares); Savenije, Hubert (TU Delft Water Resources)","","2017","style=""margin: 0cm 0cm 10pt;"">An estuary forms the transition between the ocean/sea and a river and within its boundaries fresh and salt water mix. Fresh water intake points may be located within the reach of salt intrusion. In order to justify political and managerial decisions it is thus necessary to understand and be able to predict the process of salt intrusion in estuaries. For one-dimensional dynamic simulation of the hydrodynamics and salinity intrusion the modelling suite SOBEK is available. In the Netherlands this software is used to evaluate the impact of for example measures and climate change on salinity intrusion in the Dutch Rhine Meuse Delta (RMD). Recent validations of SOBEK have mainly focused on water levels and discharges, while less attention was payed to its capability to describe salt transport. Therefore the objective of this research is to obtain a better understanding of dynamic one-dimensional modelling of salt transport and improve the governing formulations with the newest scientific insights ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Water Resources","","",""
"uuid:830a3b32-cd3f-4a27-8b7d-be6f667fe837","http://resolver.tudelft.nl/uuid:830a3b32-cd3f-4a27-8b7d-be6f667fe837","Interaction between opposite river bank dynamics","Bonilla Porras, J.A.; Crosato, A. (TU Delft Environmental Fluid Mechanics; IHE Delft Institute for Water Education); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics)","","2017","style=""margin: 0cm 0cm 10pt;"">Although many studies regarding bank erosion and accretion can be found in the literature, it is not common to find works studying the interaction between opposite banks. Some existing morphodynamic models describe bank erosion as an event that depends on near-bank flow and bed topography, as well as on eroding bank properties. Most developed models do not include opposite bank accretion, with the exception of, e.g. Asahi et al. (2013) and Eke et al. (2014). . These models can represent opposite bank dynamics. Analyses of bank-to-bank interactions, showing for instance where the effects of depositing bank push are felt (where exactly opposite bank erosion occurs), are lacking. Observations by Nanson and Hickin (1983) on the Beatton River, in Canada, suggest that bank accretion is important for opposite bank erosion to occur, in addition to the magnitude and duration of hydrological events. The present study focuses on the interaction between opposite river banks. The aim is to describe how bank accretion influences opposite bank erosion and whether there is a spatial lag in this interaction. This paper presents only some preliminary results. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Environmental Fluid Mechanics","","",""
"uuid:aacbdf93-a99f-45d9-87fb-743bbfd5f93b","http://resolver.tudelft.nl/uuid:aacbdf93-a99f-45d9-87fb-743bbfd5f93b","Closing secondary channels in large sand-bed braided rivers","Ostanek Jurina, T.; Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2017","style=""margin: 0cm 0cm 10pt;"">Large braided rivers have many beneficial roles, from provision of water for agriculture and means of transport to various ecosystem services. However, they are geomorphologically active, which results in problems with bank erosion and navigability. Some of the largest rivers may have bank line shifts of hundreds of meters per year (Baki and Gan, 2012). This leads to loss of homes and good agricultural land, destruction of infrastructure and flood protection works. River training measures are used to combat these problems and reclaim lost land. Conventional structures, mostly developed in smaller watercourses, are problematic in very large and unpredictable braided rivers, due to their required size, cost, inflexibility and environmental disturbance (Nakagawa et al., 2013). More adaptable, cheaper (local materials) and less disturbing measures are required. One promising possibility is the use of recurrent measures (such as bandals) to close aggressive secondary channels (Mosselman, 2006). Coupled with a prediction model for planform changes and erosion (such as Klaassen et al., 1993), this can be a very flexible and efficient way to protect nearby land against bank erosion, start land reclamation or improve navigability. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:271c0272-380a-40be-bfbd-980f5ffba7ec","http://resolver.tudelft.nl/uuid:271c0272-380a-40be-bfbd-980f5ffba7ec","Detect to Avoid: Supporting Aviation Safety with Bird Movement Information","Metz, I.C. (TU Delft Control & Simulation; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Muhlhausen, Thorsten (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Ellerbroek, Joost (TU Delft Control & Simulation); Hoekstra, J.M. (TU Delft Control & Simulation); Kügler, D. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR))","","2017","The presented research evaluates the concept of providing an airport’s Air Traffic Control with a bird strike advisory system. Such a system informs the controller about current and predicted bird movements in the arrival and departure corridors. Based on this information, the controller can decide to delay or reroute air traffic in order to prevent collisions with birds. To evaluate the resulting effects on the airport’s safety and capacity, fast-time simulations merging air traffic and bird movements, will be performed. To represent realistic bird movements, inputs from two different radar types are combined. For the close airport environment, historic bird tracks from avian radar installed at the considered airport serve as source. To cover the arrival and departure corridors up to 3000ft, the altitude up to which the largest majority of bird strikes occur, data from weather radar is used: based on bird densities and speed directions, bird tracks are generated for different altitude bands. The obtained tracks from avian and weather radar are combined in order to retrieve the overall image of bird movements in the close and extended airport area. This paper describes the methods for extracting, generating and finally combining the inputs from the two radar sources, in order to generate realistic bird movements. These will serve as a key input parameter for evaluating the effects of a bird strike advisory system with fast-time simulations.","","en","abstract","","","","","","","","","","","Control & Simulation","","",""
"uuid:3d262349-fa66-4390-b908-122b16f81051","http://resolver.tudelft.nl/uuid:3d262349-fa66-4390-b908-122b16f81051","Quantum nondemolition measurement of light intensity fluctuations in an optomechanical experiment","Pontin, A. (University of Florence; Istituto Nazionale di Fisica Nucleare - Sezione di Firenze); Bonaldi, M. (Trento Institute for Fundamental Physics and Application; Institute of Materials for Electronics and Magnetism, Nanoscience-Trento-FBK Division); Borrielli, Antonio (Trento Institute for Fundamental Physics and Application; Institute of Materials for Electronics and Magnetism, Nanoscience-Trento-FBK Division); Marconi, L. (CNR-INO); Marino, F. (CNR-INO; Istituto Nazionale di Fisica Nucleare - Sezione di Firenze); Pandraud, G. (TU Delft EKL Processing); Prodi, G.A. (Trento Institute for Fundamental Physics and Application; Università di Trento); Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials); Serra, E. (TU Delft Electronic Components, Technology and Materials; Trento Institute for Fundamental Physics and Application); Marin, F. (University of Florence; CNR-INO; Istituto Nazionale di Fisica Nucleare - Sezione di Firenze; European Laboratory for Non-linear Spectroscopy (LENS))","","2017","Summary form only given. According to quantum mechanics, there exists a class of observables for which is possible to confine the perturbation produced by a continuous measurement to the conjugate variable. Therefore, it is possible to devise experimental schemes that allow estimating the observed variable with arbitrary accuracy, or preparing it in a well-known state. Such schemes are referred to as quantum non-demolition measurements (QND). Among these observables there is the amplitude of the light field. Indeed, it is possible to exploit a movable mirror to implement a QND scheme [1]. Intensity fluctuations of an optical field impinging on it are not affected by the interaction. However, the movable mirror is excited by the associated radiation pressure. This, in turn, affects the phase of the field.We have performed an optomechanical experiment, based on a Fabry-Pérot cavity in which the end mirror is a high Q micro-mechanical device [2], where we have simultaneously measured intensity fluctuations of the field reflected by the cavity and the mirror motion imprinted in the phase fluctuations. By exploiting the correlations between these variables, we demonstrate a reduced uncertainty on intensity fluctuations actually achieving a sub-shot noise level.","","en","abstract","","","","","","","","","","","EKL Processing","","",""
"uuid:c65a8a11-5f72-4ef4-8cf0-6a27997e4617","http://resolver.tudelft.nl/uuid:c65a8a11-5f72-4ef4-8cf0-6a27997e4617","Overhang free topology optimization applied to flow optimization","van de Ven, E.A. (TU Delft Computational Design and Mechanics; Royal Netherlands Aerospace Centre NLR); Verboom, J.M. (Royal Netherlands Aerospace Centre NLR; Student TU Delft); Ayas, C. (TU Delft Computational Design and Mechanics); Langelaar, Matthijs (TU Delft Computational Design and Mechanics); Maas, Robert (Royal Netherlands Aerospace Centre NLR); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2017","","Additive manufacturing; Flow optimization; Overhang; Topology optimization","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:6a80cee8-e86a-4aeb-904d-d4675016c09f","http://resolver.tudelft.nl/uuid:6a80cee8-e86a-4aeb-904d-d4675016c09f","A semi-analytical thermal model of selective laser melting process","Yang, Y. (TU Delft Computational Design and Mechanics); Ayas, C. (TU Delft Computational Design and Mechanics); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2017","","Additive manufacturing; Flow optimization; Overhang; Topology optimization","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:8d0eec42-e313-4b1f-8338-526f1967217f","http://resolver.tudelft.nl/uuid:8d0eec42-e313-4b1f-8338-526f1967217f","A computationally efficient process modelling approach for selective laser melting","Yang, Y. (TU Delft Computational Design and Mechanics); Ayas, C. (TU Delft Computational Design and Mechanics); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2017","","Additive manufacturing; Flow optimization; Overhang; Topology optimization","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:bfbe8b47-b7fe-4591-8ec2-1f10fd87958a","http://resolver.tudelft.nl/uuid:bfbe8b47-b7fe-4591-8ec2-1f10fd87958a","Computational time issues of AM process simulations with a view to large-scale topology optimization","Munro, D.P. (TU Delft Computational Design and Mechanics); Ayas, C. (TU Delft Computational Design and Mechanics); Langelaar, Matthijs (TU Delft Computational Design and Mechanics); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2017","","Additive manufacturing; Flow optimization; Overhang; Topology optimization","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:82a90cb2-2410-43ab-bb60-92029d82aa1e","http://resolver.tudelft.nl/uuid:82a90cb2-2410-43ab-bb60-92029d82aa1e","Topology optimization of part and support structures for additive manufacturing considering machining forces","Langelaar, Matthijs (TU Delft Computational Design and Mechanics)","","2017","","Additive manufacturing; Flow optimization; Overhang; Topology optimization","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:bd24be48-eb8e-4934-9157-82685d439eeb","http://resolver.tudelft.nl/uuid:bd24be48-eb8e-4934-9157-82685d439eeb","Predictive simulations of human walking produce realistic cost of transport at a range of speeds","Ong, Carmichael F. (Stanford University); Geijtenbeek, T. (TU Delft Biomechatronics & Human-Machine Control); Hicks, Jennifer L. (Stanford University); Delp, Scott L. (Stanford University)","","2017","Predictive simulations of human walking have great potential to expand our understanding of locomotion. For instance, they can isolate the effect of specific impairments on observed gait pathologies or aid in designing assistive devices by modeling human-device interactions. Introducing simulated impairments or adding augmentation devices to a model may change kinematics, including preferred walking speed. Experimental studies have characterized cost of transport over a wide range of walking speeds, and have shown that humans prefer walking at a speed that minimizes their cost of transport [1]. The purpose of this study was to use a predictive simulation framework to reproduce experimental energetic cost of transport. We trained a model to walk at speeds between 0.5 and 2.0 m/s and compared our simulated cost of transport to experimental data.","","en","abstract","","","","","","","","","","","Biomechatronics & Human-Machine Control","","",""
"uuid:6c53412d-b1fa-4172-856e-db6979033321","http://resolver.tudelft.nl/uuid:6c53412d-b1fa-4172-856e-db6979033321","Horizontal and Vertical Wind Measurements from GOCE Angular Accelerations","Visser, T. (TU Delft Astrodynamics & Space Missions); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions); de Visser, C.C. (TU Delft Control & Simulation); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2017","Because of the highly accurate accelerometers, the GOCE mission has proven to be a unique source of thermosphere neutral density and cross-wind data. In the current methods, in which only the horizontal linear accelerations are used, the vertical winds cannot be obtained. In the algorithm proposed in this paper, angular accelerations derived from the individual gradiometer accelerations are used to obtain the vertical wind speeds as well. To do so, the measured angular rate and acceleration are combined to find a measurement of the torque acting on the spacecraft. This measurement is then corrected for modeled control torque applied by the magnetic torquers, aerodynamic torque, gravity gradient torque, solar radiation pressure torque, the torque caused by the misalignment of the thrust with respect to the center of gravity, and magnetic torque caused by the operation of several different subsystems of the spacecraft bus. Since the proper documentation of the magnetic properties of the payload were not available, a least squares estimate is made of one hard- and one soft-magnetic dipole pertaining to the payload, on an aerodynamically quiet day. The model for aerodynamic torque uses moment coefficients from Monte-Carlo Test Particle software ANGARA. Finally the neutral density, horizontal cross-wind, and vertical wind are obtained from an iterative process, in which the residual forces and torques are minimized. It is found that, like horizontal wind, the vertical wind responds strongly to geomagnetic storms. This response is observed over the whole latitude range, and shows seasonal variations.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:fcdaf945-8a00-43f4-a375-614839cba37b","http://resolver.tudelft.nl/uuid:fcdaf945-8a00-43f4-a375-614839cba37b","Time-varying perceived motion mismatch due to motion scaling in curve driving simulation","van Leeuwen, T.D.; Cleij, D. (TU Delft Control & Simulation; Max Planck Institute); Pool, D.M. (TU Delft Control & Simulation); Mulder, Max (TU Delft Control & Operations); Bülthoff, Heinrich H. (Max Planck Institute for Biological Cybernetics)","","2017","","","en","abstract","","","","","","","","","","Control & Operations","Control & Simulation","","",""
"uuid:719701f9-a4dc-4f04-a577-a049abfcbef8","http://resolver.tudelft.nl/uuid:719701f9-a4dc-4f04-a577-a049abfcbef8","Measuring and Modeling Driver Steering Behavior: From Compensatory Tracking to Curve Driving","van der El, Kasper (TU Delft Control & Simulation); Pool, D.M. (TU Delft Control & Simulation); Mulder, Max (TU Delft Control & Operations)","","2017","","","en","abstract","","","","","","","","","","Control & Operations","Control & Simulation","","",""
"uuid:dd56be63-6b19-475e-941e-adec1756edc1","http://resolver.tudelft.nl/uuid:dd56be63-6b19-475e-941e-adec1756edc1","A method to assess individualized driver models: Descriptiveness, Identifiability and Realism","Barendswaard, S. (TU Delft Human-Robot Interaction); Pool, D.M. (TU Delft Control & Simulation); Abbink, D.A. (TU Delft Human-Robot Interaction)","","2017","","","en","abstract","","","","","","","","","","","Control & Simulation","","",""
"uuid:5de5dfd8-c7ce-4763-b3e4-11a45792ab0d","http://resolver.tudelft.nl/uuid:5de5dfd8-c7ce-4763-b3e4-11a45792ab0d","Closed-loop wind farm control","van Wingerden, J.W. (TU Delft Team Jan-Willem van Wingerden); Pao, Lucy (University of Colorado); Fleming, Paul (National Renewable Energy Laboratory)","","2017","For wind farm control, the current practice in industry is that every turbine has its own wind turbine controller that will optimize its own performance in terms of power output, load mitigation, and/or reference tracking. However, in several national American and European1 research projects, researchers from industry and academia have shown that if you lower the power set point of the first turbine in a row of turbines you can increase the total amount of energy captured in that row by 2%. These control results were mainly obtained by using engineering models and simplistic scaled wind tunnel experiments. In more recent studies,2 it has been shown that the success of these methodologies highly depend on the atmospheric conditions, the quality of the model, and the variability of the flow within a wind farm. In this presentation, we will present a closed-loop control framework that can mitigate the inevitable uncertainties present in the control-oriented models and that is robust against the time-varying behaviour.","","en","abstract","","","","","","","","","","","Team Jan-Willem van Wingerden","","",""
"uuid:c9c93b5e-64aa-4889-b5b3-ebe012e2b8f1","http://resolver.tudelft.nl/uuid:c9c93b5e-64aa-4889-b5b3-ebe012e2b8f1","Comparison of Levelized Cost of Energy of a 10 MW superconducting and magnetic pseudo direct drive generator targeted for the INNWIND.EU reference turbine","Abrahamsen, Asger Bech (Technical University of Denmark); Liu, D. (TU Delft DC systems, Energy conversion & Storage); Magnusson, Niklas (SINTEF); Thomas, A (Siemens Wind Power); Z., Azar (Siemens Wind Power); Stehouwer, Ewoud (DNV-GL); Hendriks, E (Knowledge Centre WMC); Penzkofer, A. (University of Sheffield); Atallah, K (University of Sheffield); Dragan, R.R. (Magnomatics); .Clark, R.E. (Magnomatics); Deng, F. (Aalborg University); Chen, Z (Aalborg University); Karwatzki, D. (Leibniz Universität); Mertens, A. (Leibniz Universität); Parker, M. (University of Strathclyde); Finney, SJ (University of Strathclyde); Polinder, H.","","2017","Innovative drive trains targeted at 10-20 MW offshore turbines are investigated in the INNWIND.EU project in order to determine the impact on the Levelized Cost of Energy (LCoE) resulting when installed in the ,North sea at 50 m of water [1]. The two main technologies studied are superconducting direct drive (SCDD)[2] and the magnetic pseudo direct drive (PDD) [3] generators, which are both capable to providing compact drive trains with low weight and a small number of moving parts compared to a gearbox based drive train (see figure 1a). Superconducting field coils are used to provide the torque in the direct drive generators, where the armature windings are based on conventional copper wire and magnetic steel laminates operated at ambient temperature. Magnetic pseudo direct drive generators consist of a magnetic gearbox made of an inner free rotor (rotating at a geared up speed to the blade input) and an intermediate drive rotor inserted into an outer static armature winding, where the electricity is harvested.","","en","abstract","","","","","","","","","","","DC systems, Energy conversion & Storage","","",""
"uuid:c43c860d-5384-44a2-81ee-8d49dbea8857","http://resolver.tudelft.nl/uuid:c43c860d-5384-44a2-81ee-8d49dbea8857","Scalable Data Processing System for Satellite Data Mining","Speretta, S. (TU Delft Space Systems Egineering); Ilin, A.","","2017","Distribution and processing of satellite data, being it engineering telemetry or scientific measurements, still poses several challenges. The recent appearance of big constellations dramatically increased the amount of data available, actually making the challenges in data processing and mining even more pressing.
A similar problem was also encountered by web companies such as Google and Facebook that had to focus on better and faster archiving and processing the vast amount of data they were collecting. By looking at the problem from the data processing point of view, in this paper we present the development
of a data distribution and processing architecture suited for small satellite operations. By focusing first on the current trends in distributed ground systems for single satellites and massive constellations, we analyze the requirements from the users prospective. This mandated a system that allows users to receive
data coming from multiple ground stations and satellites in quasi real-time. Many possible satellite data users require also quick and automatic data retrieval, as compared, for example, to big scientific missions where data can only be selected from a catalog and may be delivered to the users with considerable delays. This paper shows the evolution of the system from its first version that used custom-developed application running on a single machine, to a fully scalable and distributed architecture. It was found that scalability is critical to accommodate a big number of ground stations, leading to high peak network loads. Our solution benefits heavily from the developments in data analytics developed by web companies such as Apache Kafka and NoSQL databases, which have to process and categorize petabytes of data daily. Beside a fast and scalable data back-end, we focused on an efficient data processing and dissemination
system that makes heavy use of distributed database systems, peer-to-peer communication to deliver processed data to end users within seconds from reception. Tests performed injecting data of previous space missions (to simulate real data reception) showed limited delays between several interconnected
nodes. The use of distributed database systems, rather than real-time data links, allowed to couple the system directly to data processing engines, like Apache Hadoop, commonly used to perform data mining. This approach provides a scalable and reliable solution based on existing frameworks and adds an efficient
data distribution system for very quick data processing","","en","abstract","","","","","","","","","","","Space Systems Egineering","","",""
"uuid:6a540f33-f408-4565-bd22-a21e0901818f","http://resolver.tudelft.nl/uuid:6a540f33-f408-4565-bd22-a21e0901818f","Retrieving the cloud coverage on Earth-like exoplanets using polarimetry","Rossi, L.C.G. (TU Delft Astrodynamics & Space Missions); Stam, D.M. (TU Delft Astrodynamics & Space Missions); Turbet, M. (Universite Pierre et Marie Curie (UPMC))","","2017","In this work, we analyse linear polarization data of the planet at a distance, obtained with the Extreme Polarimeter (ExPo) on the William Herschel Telescope
on La Palma. These spatially resolved, high-accuracy polarization observations of Venus show faint circular patterns centered on the sub-solar point that are absent in the flux observations. So far, careful analyses have ruled out instrumental effects which leaves us to wonder about atmospheric properties on Venus as the cause of the circular patterns. Using numerical simulations of the flux and polarization of sunlight that is reflected by Venus, we have investigated the relation between the observed patterns and several atmospheric properties, such as variations in particle sizes, composition, density and altitude. We discuss the plausibility of the possible causes in the view of the current knowledge
of the composition and dynamical processes in Venus’s atmosphere.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:d1f5a385-d9dd-4ecb-a800-c9d2c0bf1b52","http://resolver.tudelft.nl/uuid:d1f5a385-d9dd-4ecb-a800-c9d2c0bf1b52","Traces of exomoons in flux and polarization signals of starlight reflected by exoplanets","Berzosa Molina, Javier (Student TU Delft); Stam, D.M. (TU Delft Astrodynamics & Space Missions); Rossi, L.C.G. (TU Delft Astrodynamics & Space Missions)","","2017","The detection of moons around extrasolar planets is one of the main focuses of current and future observatories. These silent companions contribute to the planets' observed signals but are barely detectable with current methods. Numerous gaseous exoplanets are known to orbit in the habitable zones of stars, and the expected abundance of natural satellites and their diversity in composition make them ideal targets when looking for habitable celestial bodies. And moons are suspected to play key roles in stabilizing a planet's rotational axis and hence its climate. We show that an exomoon orbiting an Earth-like exoplanet could be identified by measuring the flux and polarization of starlight reflected by the planet-moon system, allowing the characterization of their orbital motions and physical properties.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:852bdc86-b922-42fb-ae06-67fc7bb84ce1","http://resolver.tudelft.nl/uuid:852bdc86-b922-42fb-ae06-67fc7bb84ce1","Characterization of fluid mud layers for navigational purposes","Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Chassagne, C. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics); Rutgers, Ronald (Port of Rotterdam); Noordijk, Arie (Port of Rotterdam); Nipius, Karoune (Ministry of Infrastructure and the Environment); Velinga, Tiedo (Port of Rotterdam)","","2017","The objective of this study is to get a new insight into in-situ characterization of fluid mud layers. Water Injection Dredging has been performed to create a fluid mud layer in the 8th Petroleumhaven at the Port of Rotterdam. Four measuring tools, conventional multi-beam echo-sounder, DensX, Graviprobe and Rheocable have been used to monitor the fluid mud layer properties over the time.
The results suggest that the currently employed density-based nautical depth criterion has to be revised to ensure more efficient navigation in the vicinity of fluid mud layers","","en","abstract","","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:0484e6ae-75dc-4628-b0cf-6a1700660ae3","http://resolver.tudelft.nl/uuid:0484e6ae-75dc-4628-b0cf-6a1700660ae3","Wave transformation on the mangrove-mud coast of Demak, Indonesia","Tas, S.A.J. (TU Delft Environmental Fluid Mechanics); Gijón Mancheño, A. (TU Delft Environmental Fluid Mechanics); Herman, P.M.J. (TU Delft Environmental Fluid Mechanics; Deltares); Reniers, A.J.H.M. (TU Delft Environmental Fluid Mechanics); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics)","","2017","In this paper the typical hydrodynamics on mangrove-mud coasts are studied. Worldwide, these coasts experience serious erosion problems, and while the importance of mangrove ecosystems is becoming widely recognised, mangrove restoration projects frequently fail due to poor understanding of the system, especially the hydrodynamics. Therefore, a landscape model of the eroding coastline of the Demak district in Indonesia is developed to analyse the typical hydrodynamics associated to mangrove-mud coasts. Owing to the fine sediment, these coastlines are characterised by gentle slopes, in the order of 1:1000 or less. Both the theoretical and numerical wave transformation have to be re-evaluated on such slopes, which is done by combining models with field measurements. Also the current patterns and density effects are studied in detail to generate a full understanding of the hydrodynamics on mangrove-mud coasts.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:8139712d-5e77-4457-9b63-e952248e01c5","http://resolver.tudelft.nl/uuid:8139712d-5e77-4457-9b63-e952248e01c5","The Importance of Wind-induced Sediment Fluxes on Tidal Flats","Colosimo, I. (TU Delft Environmental Fluid Mechanics); van Prooijen, Bram (TU Delft Environmental Fluid Mechanics); van Maren, D.S. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics); Reniers, A.J.H.M. (TU Delft Environmental Fluid Mechanics)","","2017","Port maintenance and nature preservation are two often conflicting aspects of coastal management. Within a Pilot Project in the Western Wadden Sea (the Netherlands - see Figure1a) we test a win-win solution that could reduce harbour siltation while simultaneously stimulate saltmarsh development.
For this purpose, fine material, dredged in the Port of Harlingen, is used to increase the bed level of the intertidal flats at North-East of the harbour. The sediment is not disposed directly on the mudflat but at the North-East edge of the Kimstergat Channel (Figure1b). The strategy is based on the presumption that the flood dominant system results in an extra net sediment transport onto the Koehool Mudflat (Figure1b). The imposed higher mud supply will gradually feed the mudflat (hence the name of the project: The Mud Motor) and is expected to accelerate the rate of bed level increase and, as consequence, the switch from a bare to a vegetated mudflat state.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:d0ee96bf-1b65-45d3-964b-1b41d3a23758","http://resolver.tudelft.nl/uuid:d0ee96bf-1b65-45d3-964b-1b41d3a23758","Estuarine morphodynamic adaptation to sediment supply and human activities: A case study of turbidity maximum","Zhu, C. (TU Delft Coastal Engineering; East China Normal Univeristy); Guo, L (East China Normal University); Tian, B. (East China Normal University); He, Q (East China Normal University); Wang, Zhengbing (TU Delft Coastal Engineering; Deltares)","","2017","Estuarine morphodynamics undergo significant changes due to declined sediment supply from river, rising sea-level, and human interferences (Syvitski and Saito, 2007; Syvitski et al., 2009). The Yangtze Estuary is such a case whose decadal morphodynamic evolution was broadly examined. It was documented that the subaqueous delta shifted from deposition to erosion since the early 2000s due to sediment supply reduction after the Three Gorges Dam (Yang et al., 2015) while some others reported that the estuary mouth bar area sustains accretion until 2010 (Luan et al., 2016; Zhu et al., 2016). The mouth bar area of the Yangtze Estuary is where the turbidity maximum exists. To clarify the morphodynamic changes therein, we examine the two large scale shoals, i.e. the Hengsha flat and the Jiuduan shoal, based on bathymetric data between 1958 and 2016 and satellite images since 1985.","","en","abstract","","","","","","","","","","","Coastal Engineering","","",""
"uuid:8ddd8731-404d-4ea8-82a6-d8c69858f96e","http://resolver.tudelft.nl/uuid:8ddd8731-404d-4ea8-82a6-d8c69858f96e","The effect of initial conditions on the consolidation of mud","Barciela Rial, M. (TU Delft Environmental Fluid Mechanics); van den Bosch, Barend; Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares); van Paassen, L.A. (TU Delft Geo-engineering); Griffioen, Jasper (Universiteit Utrecht; TNO); van Kessel, Thijs (Deltares)","","2017","Sediment is becoming scarce. Therefore, soft sediments are progressively being used for nature building. The MarkerWadden is an example of an ongoing Building with Nature (BwN) project which aims to improve the ecology of Lake Markermeer (The Netherlands) by creating a wetland with the cohesive sediments from the bed of the lake. It represents one of the first projects using fresh unconsolidated mud as a filling material. However, building with these fine sediments represents a
great challenge, because of their complex properties.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:5eacfb85-efdf-43f6-a862-8661b54c6cc7","http://resolver.tudelft.nl/uuid:5eacfb85-efdf-43f6-a862-8661b54c6cc7","An efficient consolidation model for morphodynamic simulations in low SPM-environments","Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares); Zhou, Zeng (Hohai University); Battista, Guilia (Deltares); van Kessel, Thijs (Deltares); Jagers, Bert (Deltares); van Maren, D.S. (Deltares); van der Wegen, Mick (IHE Delft Institute for Water Education)","","2017","This paper presents a fast consolidation model suitable for long-term morphodynamic simulations. This model is applicable for muddy systems where sedimentation rates are smaller than consolidation rates, assuming quasi-equilibrium of the consolidating bed. It compares to the consolidation model developed by Sanford (2008). However, in that model, a heuristic, exponential density profile was used. Instead, the current model is derived from the full consolidation (Gibson) equation. The model’s material parameters (hydraulic conductivity, consolidation coefficient and strength) can therefore be derived from soil mechanical experiments in the laboratory.
Dynamic caches have been proposed to adapt this balance to the workload type. Similarly, dynamic processors aim to execute workloads as efficient as possible to being able to balance between exploiting Instruction-level parallelism (ILP) and Thread-level parallelism (TLP). To support this, they consist of multiple processing components and caches that have adaptable interconnects
between them. Depending on the workload characteristics, these can connect them together to form a large core that exploits ILP, or split them up to form multiple cores that can run multiple threads (exploiting TLP). In this paper, we propose a cache system that is able to further exploit this additional connectivity
of a dynamic VLIW processor by being able to forward cache accesses to multiple cache blocks while the processor is running in multi-threaded (‘split’) mode. Additionally, only requests to global data are broadcasted, while accesses to local data are kept private. This will improve the hit rates similar to existing cache
sharing schemes, but reduce the penalty due to stalling the other subcores. Local accesses are recognized by distinguishing memory accesses relative to the stack frame pointer. Results show that our cache exhibits similar miss rate reductions as shared caches (up to 90% and on average 26%), and reduces the number of
broadcasted accesses by 21%.","","en","abstract","","","","","","","","","","","Computer Engineering","","",""
"uuid:745ea79f-88c9-4c9e-9f22-58319c7111e3","http://resolver.tudelft.nl/uuid:745ea79f-88c9-4c9e-9f22-58319c7111e3","Geometric effects on the flux and polarization signals of Jupiter-sized exoplanets","Palmer, Chris (Student TU Delft); Rossi, L.C.G. (TU Delft Astrodynamics & Space Missions); Stam, D.M. (TU Delft Astrodynamics & Space Missions)","","2017","The direct detection of reflected starlight from exoplanets marks the beginning of a new era in the characterization of extrasolar planetary atmospheres. The flux and in particular the linear polarization signals from such planets are sensitive to atmospheric structure and composition, but other effects may also contribute to observed signals. We investigate the influence of an exoplanet’s shape and orbit
orientation on its flux and polarization signature, and compare it against the influence of a variable cloud cover.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:ed00e679-a7c1-4307-80ec-38c9524ed869","http://resolver.tudelft.nl/uuid:ed00e679-a7c1-4307-80ec-38c9524ed869","Constructing a Consensus Phylogeny from a Leaf-Removal Distance: (Extended Abstract)","Chauve, Cedric (Simon Fraser University); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Lafond, Manuel (University of Ottawa); Scornavacca, Celine (Université de Montpellier); Weller, Mathias (Université de Montpellier)","","2017","","Computational biology; Phylogenetics; Parameterized algorithms; Approximation; Consensus trees; Leaf deletion","en","abstract","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:94817399-559f-40f4-9661-f9bcf50c22ef","http://resolver.tudelft.nl/uuid:94817399-559f-40f4-9661-f9bcf50c22ef","IEA Wind Task 37 System Modeling Framework and Ontology for Wind Turbines and Plants","Dykes, K (National Renewable Energy Laboratory); Sanchez Perez Moreno, S. (TU Delft Wind Energy); Zahle, Frederik (Technical University of Denmark); Ning, A (Brigham Young University); McWilliam, M. (Technical University of Denmark); Zaaijer, M B (TU Delft Wind Energy)","","2017","This presentation will provide an overview of progress to date in the development of a system modeling framework and ontology for wind turbines and plants as part of the larger IEA Wind Task 37 on wind energy systems engineering. The goals of the effort are to create a set of guidelines for a common conceptual architecture for wind turbines and plants so that practitioners can more easily:
• Share descriptions of wind turbines and plants across multiple parties and reduce the Effort for translating
descriptions between models,
• Integrate different models together and collaborate on model development, and
• Translate models among different levels of fidelity in the system.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:e3d75a9d-3e76-4721-b59f-fd782aaa29aa","http://resolver.tudelft.nl/uuid:e3d75a9d-3e76-4721-b59f-fd782aaa29aa","OWFgraph: A graph database for the offshore wind farm domain","Quaeghebeur, Erik (TU Delft Wind Energy); Sanchez Perez Moreno, S. (TU Delft Wind Energy); Zaaijer, M B (TU Delft Wind Energy)","","2017","The construction and management of an offshore wind farm involves many disciplines, e.g. meteorology and economics. It is hard for a single researcher to keep an overview of all the relevant concepts, models, and tools from these disciplines. Nevertheless, this is needed when performing integrated modeling or analysis in the offshore wind farm domain. To help researchers keep this overview, we present OWFgraph, a knowledge base for the offshore wind farm domain, implemented as a graph database that is meant to be open and ever-improving.
A graph database stores content in nodes and relationships. A relationship is a directed edge between two nodes. In our implementation, each of the nodes and relationships can have multiple properties, i.e., key-value pairs; moreover, nodes can have multiple labels, whereas relationships have only a single type.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:29add911-d613-4b96-9807-876ab2cafd9d","http://resolver.tudelft.nl/uuid:29add911-d613-4b96-9807-876ab2cafd9d","Investigating circular patterns in linear polarization observations of Venus","Mahapatra, G. (TU Delft Astrodynamics & Space Missions); Stam, D.M. (TU Delft Astrodynamics & Space Missions); Rossi, L.C.G. (TU Delft Astrodynamics & Space Missions); Rodenhuis, M. (Universiteit Leiden); Snik, Frans (Universiteit Leiden); Keller, C.U. (Universiteit Leiden)","","2017","In this work, we analyse linear polarization data of the planet at a distance, obtained with the Extreme Polarimeter (ExPo) on the William Herschel Telescope
on La Palma. These spatially resolved, high-accuracy polarization observations of Venus show faint circular patterns centered on the sub-solar point that are absent in the flux observations. So far, careful analyses have ruled out instrumental effects which leaves us to wonder about atmospheric properties on Venus as the cause of the circular patterns. Using numerical simulations of the flux and polarization of sunlight that is reflected by Venus, we have investigated the relation between the observed patterns and several atmospheric properties, such as variations in particle sizes, composition, density and altitude. We discuss the plausibility of the possible causes in the view of the current knowledge
of the composition and dynamical processes in Venus’s atmosphere.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:653a62aa-127a-4e66-8b27-6abd2bf64700","http://resolver.tudelft.nl/uuid:653a62aa-127a-4e66-8b27-6abd2bf64700","Model and trajectory optimization for an ideal laser-enhanced solar sail","Carzana, L. (Student TU Delft); Dachwald, Bernd (FH Aachen University of Applied Sciences); Noomen, R. (TU Delft Astrodynamics & Space Missions)","","2017","A laser-enhanced solar sail is a solar sail that is not solely propelled by solar radiation but additionally by a laser beam that illuminates the sail. This way, the propulsive acceleration of the sail results from the combined action of the solar and the laser radiation pressure onto the sail. The potential source of the laser beam is a laser satellite that coverts solar power (in the inner solar system) or nuclear power (in the outer solar system) into laser power. Such a laser satellite (or many of them) can orbit anywhere in the solar system and its optimal orbit (or their optimal orbits) for a given mission is a subject for future research. This contribution provides the model for an ideal laser-enhanced solar sail and investigates how a laser can enhance the thrusting capability of such a sail. The term ”ideal” means that the solar sail is assumed to be perfectly reflecting and that the laser beam is assumed to have a constant areal power density over the whole sail area. Since a laser beam has a limited divergence, it can provide radiation pressure at much larger solar distances and increase the radiation pressure force into the desired direction. Therefore, laser-enhanced solar sails may make missions feasible, that would otherwise have prohibitively long flight times, e.g. rendezvous missions in the outer solar system. This contribution will also analyze exemplary mission scenarios and present optimial trajectories without laying too much emphasis on the design and operations of the laser satellites. If the mission studies conclude that laser-enhanced solar sails would have advantages with respect to ”traditional” solar sails, a detailed study of the laser satellites and the whole system architecture would be the second next ste","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:a7564b59-8695-4174-a28c-0fe299bdc177","http://resolver.tudelft.nl/uuid:a7564b59-8695-4174-a28c-0fe299bdc177","Robustness and stability of integrated stochastic optimization approaches for scheduling trains and railway infrastructure","Centulio, G. (TU Delft Transport Engineering and Logistics); Meng, Lingyun; D'Ariano, Andrea; Corman, F. (TU Delft Transport Engineering and Logistics)","","2017","This work addresses a tactical railway traffic management problem focused on the opti-mization of train dispatching decisions and timing decisions related to short-term main-tenance works in a railway network subject to disturbed process times. This is modeled as a mixed-integer programming formulation in which the traffic flow and track mainten-ance variables, constraints and objectives are integrated under a stochastic environment. The resulting bi-objective optimization problem is to minimize the deviation from a sche-duled plan and to maximize the number of aggregated maintenance works. The two ob-jectives require to schedule competitive train operations versus maintenance works on the same infrastructure elements. Numerical experiments are performed on a realistic railway network. We measure the quality of the integrated solutions in terms of their robustness to random perturbations of the train travel times and of the maintenance works. Pareto op-timal methods are compared for the bi-objective problem. We also evaluate the impact of introducing routing stability constraints in order to force the trains to keep the same route among the different stochastic disturbed scenarios. The experiments show that forcing the routing stability reduces the routing flexibility and the ability to optimize the two perfor-mance indicators when dealing with stochastic disturbances of process times.","","en","abstract","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:85edde26-e9d9-4074-8b60-567d1c72fffa","http://resolver.tudelft.nl/uuid:85edde26-e9d9-4074-8b60-567d1c72fffa","On the kidney shape of the wake of a HAWT in yaw","Berdowski, T.J. (TU Delft Wind Energy); Ferreira, Carlos (TU Delft Wind Energy); van Zuijlen, A.H. (TU Delft Aerodynamics); van Bussel, G.J.W. (TU Delft Wind Energy)","","2017","A PhD project is being carried out on the topic of far-wake aerodynamics of Horizontal Axis Wind Turbines (HAWTs) in yawed conditions, which has a large relevance for wind farm design and optimization. Characteristic for a turbine in yaw are the inherent unsteady and non-uniform rotor loading, and the typical wake deflection and strong three-dimensional deformation effects under influence of self-induction (see figure 1). Investigation of HAWTs in yaw is important, as the larce-scale eddies of the turbulent atmosphere dictate that a wind turbine is in practise always operating in unsteady yaw, while the resulting wake effects are already significant for small yaw angles. Despite this relevance, research into the far-wake of yawed wind turbines has been very limited and the symmetry assumptions on which common wake engineering models are based conflict with the physics of the skewed wake of a yawed turbine. Nevertheless, there is an increasing interest into this topic, as it is recognized that the effect of wake deflection can be exploited as a way to optimize the overall wind farm power production through active yaw control. For this purpose, simple two-dimensional models are applied for approximating the wake deflection, but which are unable to capture the typical three-dimensional deformation effects. In summary, there is a large gap of fundamental knowledge on wake physics in yawed conditions, and what the relevance of these phenomena is on the development and issues like the re-energization process of the far-wake. To bridge this gap, the PhD project aims at improving our understanding of the wake physics of HAWTs in yaw and to draft guidelines for reduced-order models that can be applied for wind farm design and optimization. In support of this aim, the objective is to analyze the different physical “modes” that play a role in the yawed wake, through a numerial and experimental investigation of the skewed wakes aft of HAWTs and actuator discs. The results from these investigations are collected (along with results from third parties) into a high-fidelity benchmark database for model validation purposes and to be able to derive the reduced-order models. For the current conference, results will be presented of both two- and three-dimensional free-wake vortex simulations of an actuator disc in yaw. The focus is put on the crescent or kidney shaped convective wake deformation (figure 1), which is naturally not present in a two-dimensional simulation. The magnitude of this phenomenon is investigated as function of the yaw angle and thrust coefficient, and the effect on global wake parameters is assessed such as the wake deflection and velocity profile. The outcomes of this investigation are relevant for assessing the validity of two-dimensional assumptions made in current yaw models regarding the wake deflection, definition of the wake center and width, and the wake profile.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:8f17912c-580f-4c95-b33b-b12c56f460e3","http://resolver.tudelft.nl/uuid:8f17912c-580f-4c95-b33b-b12c56f460e3","Passive and active flow augmentation: From diffusers to multi-rotor machines","De Oliveira Andrade, G.L. (TU Delft Wind Energy); Balbino dos Santos Pereira, R. (TU Delft Wind Energy); van Bussel, G.J.W. (TU Delft Wind Energy); Avallone, F. (TU Delft Wind Energy); Ragni, D. (TU Delft Wind Energy)","","2017","Flow augmentation consists in modifying mass flow across the actuation plane of a rotor to enhance energy extraction or propulsive efficiency. The talk sketches the distinction between passive and active rotor augmentation strategies. Power coefficient trends are compared analytically while numerical results illustrate differences in flow topology. Rotors are stylized as actuator disks that exert homogeneous normal forces on the steady flow of inviscid fluids to highlight the distinctive features of each augmentation principle. Passive augmentation principles have been well documented because they guide the design of ducted, shrouded and diffuser-augmented wind turbines1-6. These axisymmetric bodies decrease average static pressures on the rotor plane to increase mass flux and power coefficient. Rotor-body interactions are dominated by conservative forces5,7: the bodies don’t exchange energy with the fluid but act as augmenting devices and affect global energy balance by changing rotor state. Virtual work arguments show that bodies exert streamwise forces4,6 that can be related with the power coefficient through the law of de Vries1,6. Active flow augmentation is a rather recent theoretical concept8. Its simplest energy extraction embodiment consists of an upstream actuator that accelerates flow onto a downstream actuator. This augmentation strategy is coined as active because the upstream actuator injects (spends) energy into the flow for the downstream actuator to extract (produce) energy from a greater mass flux than if it were alone. The interaction mechanism depends on the action of non-conservative forces and actuators interact exclusively through changes in total flow enthalpy when they are sufficiently far apart. No pressure interactions occur in this asymptotic case and a closed solution exists together with an analytical power coefficient law. Parallels can be drawn with wake ingestion propeller setups9 but no practical energy extraction realizations have been attempted yet. Passive and active flow augmentation concepts are different but we hope that parallels between them shed further light on the physics of energy extraction from ideal fluid flows. The communication concludes with a few reflections meant to trigger an open discussion about the implications and applicability of the discussed theories.","","en","abstract","","","","","","","","","","","Wind Energy","","",""
"uuid:85cbd3b4-9db6-436e-b01f-6b2cca849c8a","http://resolver.tudelft.nl/uuid:85cbd3b4-9db6-436e-b01f-6b2cca849c8a","Experimental characterization of individual pitch controlled vertical axis wind turbine","LeBlanc, B.P. (TU Delft Wind Energy); de la Garza Cuevas, R.; Ferreira, Carlos (TU Delft Wind Energy)","","2017","Research into the Vertical Axis Wind Turbine (VAWT) has been progressing over the last few years due to
the large shift in design constraints for large floating offshore wind turbines by leveraging tools and experience
from research beginning in the 1970s and lasting until the HAWT established market dominance in the 1990s. The beginning studies looking into the feasibility of large VAWT turbines on offshore floating platforms have been largely positive and suggest a large cost savings when comparing to equivalent HAWT turbines. These savings assume certain platform cost reductions as well as ease of operations and maintenance due to the possibility of systems being removed, like the active yaw system, and ease of access to significant components such as the gearbox and generator. In order to realize these cost gains, and perhaps identify more, it is necessary to improve the aerodynamic control of the rotor.
Flameless combustion, named as Moderate or Intense Low-oxygen Dilution (MILD) combustion or high-temperature air combustion (HiTAC), is a promising technology to improve the thermal efficiency while suppressing NOx formation in combustion systems. Flameless combustion can occur when fresh air (and/or fuel) streams are sufficiently diluted by entrained combustion products before reactions take place. It has recently been experimentally studied on laboratory-scale setups because of scientific challenges, environmental concerns and its potential industrial applications. Some burning features in flameless combustion have been observed in jet-in-hot-coflow burners which use hot coflows generated by a secondary burner or diluting air with N2 or/and CO2 to mimic the diluted air which is actually diluted by burnt gases entrainment in furnaces. With the help of highspeed cameras, the time-resolved studies on such burners have been done experimentally. E. Oldenhof et al. [1] reported that the jet-in-hot-coflow flame is stabilized by autoignition kernels and the entrainment of hot oxidizer plays an important role in the formation of autoignition kernels[2]. As O2 level in coflow is reduced, reaction zone becomes less intense leading to a greater degree of partial premixing in these flames[3]. P. R. Medwell et al.[4] also concluded that large-scale vortices can lead to a weakening of the flame front or even local extinction leading to a form of partial premixing, and may contribute to the stabilization of the flameless combustion reaction zone. With low level (5% by volume) hydrogen addition in the fuel, the flame also exhibits autoignition kernels, but this was not observed at higher level (10% and 25%) hydrogen addition cases[5]. However, how can these findings be related to the flames in a furnace is still unclear because of the lack of similar experimental observations in furnace.","","en","abstract","","","","","","","","","","","Fluid Mechanics","","",""
"uuid:cc479948-a6be-4669-8781-c6d11ef37de1","http://resolver.tudelft.nl/uuid:cc479948-a6be-4669-8781-c6d11ef37de1","CFD and Chemical Reactor Network approaches to model an inter-turbine burner","Augusto Viviani Perpignan, A.A.V. (TU Delft Flight Performance and Propulsion); Talboom, M.G.; Gangoli Rao, A. (TU Delft Flight Performance and Propulsion)","","2017","style=""margin: 0cm 0cm 10pt;"">The Flameless Combustion (FC) regime is promising to the attainment of lower emissions in gas turbine engines. The well-distributed reactions, with low peak temperatures present in the regime result in lower emissions and acoustic oscillations. However, the attainment of the FC regime on gas turbine engines has not been successful, as most of the previous design attempts failed with respect to combustion efficiency, operational range, or difficulty to integrate in an engine. Along with a novel aircraft concept, a conceptual design of a gas turbine engine with two sequential combustion chambers was presented.1 As the aircraft would allow the use of cryogenic fuels, the first (and main) combustion chamber envisages the use of hydrogen or natural gas. The inter-turbine burner (ITB) is the subsequent chamber, and would operate under the FC regime with conventional fuels.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:de636232-80cc-43b5-860e-63b82772f3ca","http://resolver.tudelft.nl/uuid:de636232-80cc-43b5-860e-63b82772f3ca","Response of SPM concentrations to storms in the North Sea: Investigating the water-bed exchange of fine sediments","Hendriks, H.C.M. (TU Delft Environmental Fluid Mechanics; Deltares); van Prooijen, Bram (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics); Aarninkhof, S.G.J. (TU Delft Coastal Engineering); van der Hout, CM (NIOZ Royal Netherlands Institute for Sea Research); Witbaard, Rob (NIOZ Royal Netherlands Institute for Sea Research)","","2017","Shallow coastal seas are subject to an increasing pressure by offshore operations. Further to a direct influence these operations impose on benthic and pelagic organisms, an indirect influence is caused by changes in sediment dynamics and morphodynamics. Temporal variations in SPM have a large effect on the timing and rate of primary production, thereby also affecting higher trophic levels. Field measurements along the Dutch coast indicate significant seasonal variations in concentrations of SPM (Suijlen and Duin, 2001; Witbaard et al., 2015). These seasonal variations originate from a marked seasonality in wind climate and the occurrence of storms. During storms, increases in SPM occur simultaneously in large parts of the Dutch coastal zone of the North Sea (Suijlen & Duin 2001), demonstrating that on short timescales, the vertical exchange between the sea bed and the water column is dominant. Model concepts with two discrete seabed layers (a fluffy top layer and a sandy lower layer) turned out to capture these fine sediment dynamics, see van Kessel et al. (2011). However, the underlying physical processes resulting in the water-bed exchange of fines are still to be unravelled. Therefore, this study aims to investigate the resuspension of fines from the bed during and after storms, accounting for the tidal variation due to the spring-neap tide cycle. This will lead to a more specific conceptualization and related parameterization of the water-bed exchange, thereby enabling to study both the direct and indirect impact of offshore operations.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:69914913-ac51-46ae-a37e-a41020cd55da","http://resolver.tudelft.nl/uuid:69914913-ac51-46ae-a37e-a41020cd55da","Equilibria and Evolution of Estuarine Fringing Intertidal Mudflats","van Prooijen, Bram (TU Delft Environmental Fluid Mechanics); Grasso, F (Ifremer); le Hir, P (Ifremer); de Vet, P.L.M. (TU Delft Environmental Fluid Mechanics; Deltares); Wang, Zhengbing (TU Delft Coastal Engineering; Deltares); Walles, B (NIOZ Royal Netherlands Institute for Sea Research); Ysebaert, Tom (NIOZ Royal Netherlands Institute for Sea Research; Wageningen University & Research)","","2017","Fringing intertidal flats are common features of elongated estuaries. We generalized the geometry of profiles of individual intertidal flats towards a common relationship, based on extensive measurement data of various estuaries. We found a strong linear relation between the width, slope and height of linear intertidal flat profiles, which also yields well for the mild-sloped upper part of convex-up profiles. Deviations of this linear relation at the lower steeper part of the flats are the result of dominating alongshore currents.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:89fcef74-483b-43c4-8e3a-b689827c2c97","http://resolver.tudelft.nl/uuid:89fcef74-483b-43c4-8e3a-b689827c2c97","How important is mud transport on large scale estuarine and deltaic morphodynamics?","Guo, L (East China Normal University); Zhu, C. (TU Delft Coastal Engineering; East China Normal University); He, Q (East China Normal University)","","2017","Sediment transport provides a critical bridge between hydrodynamics and morphodynamics. Sediment transport behaviour has obvious impacts on morphodynamic development. Long-term morphodynamic modelling enables examination of large scale morphological patterns, such as channel-shoal patterns in estuaries and deltaic channel structures. Non-cohesive sand is mostly used as the material in shaping morphology. However, most of estuaries and deltas in nature are partly or fully dominated by cohesive sediment or mud. There are researches on sand-mud interactions and their implications on total sediment transport (van Ledden, 2003). It is increasingly aware that adding mud to the system can make a big differences on the large scale morphodynamic development behaviour (Edmond and Slinger, 2009; Gelynese et al., 2010; Caldwel and Edmond, 2014). However mud transport is notoriously difficult to be defined properly in the model given the combined sensitivity to a few fundamental parameters (Partheniades, 1965; Mehta, 2014). It is thus not clearly known how mud have controls on development of large scale morphodynamics and the sensitivity to the mud property.","","en","abstract","","","","","","","","","","","Coastal Engineering","","",""
"uuid:d5449c0d-2852-4b80-ac69-159519347cfc","http://resolver.tudelft.nl/uuid:d5449c0d-2852-4b80-ac69-159519347cfc","Regime shifts in a D3D schematized Scheldt model: recent progress","De Lucas Pardo, M.A. (Deltares); Dijkstra, Y. (Deltares); van Maren, D.S. (TU Delft Environmental Fluid Mechanics; Deltares); Vroom, J (Deltares); van Kessel, T (Deltares); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares)","","2017","The Ems and Loire evolved into hyper-turbid estuaries in the course of the 20th
century. Winterwerp et al. (2013 a, b) argued that narrowing and deepening of these
rivers induced a regime shift towards these hyper-turbid conditions. This regime
shift was presumed to be driven by a positive feed-back between tidal
amplification, tidal asymmetry and sediment-induced drag reduction. As also the
Sea Scheldt was/is subject to narrowing and deepening, Winterwerp et al. reasoned
that also this river may be at risk to become hyper-turbid.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:af4558bb-6823-43a7-9825-99e2bf246811","http://resolver.tudelft.nl/uuid:af4558bb-6823-43a7-9825-99e2bf246811","Sediment trapping in the Zeebrugge Coastal Turbidity Maximum","van Maren, D.S. (TU Delft Environmental Fluid Mechanics); Vroom, J (Deltares)","","2017","The mechanisms leading to the formation and maintenance of a Coastal Turbidity Maximum (CTM) along the Belgian coastline was investigated using a complex 3D numerical model. Interpretation of model results suggests that the sediment concentration in this CTM may have strongly increased as a result of human interventions in the 1980’s. The large amount of sediment that became available
then triggered self-organizing mechanisms that maintain or strengthen the CTM.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:5561eccb-d11d-42dc-a277-41bcfd0e7956","http://resolver.tudelft.nl/uuid:5561eccb-d11d-42dc-a277-41bcfd0e7956","Wave attenuation by brushwood dams in a mud-mangrove coast","Gijón Mancheño, A. (TU Delft Environmental Fluid Mechanics); Tas, S.A.J. (TU Delft Environmental Fluid Mechanics); Herman, P.M.J. (TU Delft Environmental Fluid Mechanics; Deltares); Reniers, A.J.H.M. (TU Delft Environmental Fluid Mechanics); Uijttewaal, W.S.J. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics)","","2017","During recent decades, mangrove forests have experienced severe degradation due to unsustainable land use. Restoration of mangrove ecosystems requires the recovery of their habitat, considering ecology, hydrology, hydrodynamics, and sediment transport. In a first pilot in 2013, brushwood dams were built on the eroding coast of Demak, Indonesia, in order to emulate the function of mangrove roots and provide the physical conditions for natural colonization. However, at present there is little research on how soft structures affect the local hydrodynamics. The present study aims to improve the understanding of wave attenuation by permeable brushwood dams in Demak, combining field observations and hydrodynamic modelling using Delft3D. The findings of the study will be used to develop a landscape bio-morphodynamic model, which will be applied for planning future mangrove restoration efforts.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:a3e49e38-2005-4ede-a34d-4ea208eb98d2","http://resolver.tudelft.nl/uuid:a3e49e38-2005-4ede-a34d-4ea208eb98d2","Seasonal variation of sediment flocculation and the modeling thereof as function of biochemical factors","Deng, Z. (East China Normal University); He, Q (East China Normal University); Chassagne, C. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics)","","2017","The flocculation process and modelling of suspended sediment transport in estuarine regions is a hot topic in estuarine science[Winterwerp, 1999]. The flocculation is greatly influenced by biochemical parameters[De Lucas Pardo, 2014]. In this paper, we analyse the impact of algae on the processes of flocculation in the Yangtze Estuary, and we identify the mechanisms which are responsible for their changes. The amount of algae (phytoplankton biomass) is linked to the chlorophyll α concentration which we measured[Uncles et al., 1998]. The measurements were performed in the maximum turbidity zone. The seasonal variations of phytoplankton lead to changes in the flocculation dynamics and the composition of suspended particle matter. We recorded the floc size changes in the Yangtze Estuary and we found that: (1) the flocs are significantly influenced by tidal dynamics, as the floc size during slack water is larger than ebb tide and flood tide, (2) there is a correlation between the Chlorophyll concentration and sediment concentration, (3) the floc size is correlated to the algae-sediment mass ratio, (4) in winter, with high salinity and small river discharge, the region has a significant stratification and the floc size was smaller than the one in summer","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:ed9b3dd1-a63d-4b7a-be01-5c40a353b7ef","http://resolver.tudelft.nl/uuid:ed9b3dd1-a63d-4b7a-be01-5c40a353b7ef","High sensitive CVD graphene-based gas sensors operating under environmental conditions","Ricciardella, F. (TU Delft Electronic Components, Technology and Materials); Vollebregt, S. (TU Delft Electronic Components, Technology and Materials); Polichetti, T. (ENEA Research Center); Alfano, B. (ENEA UTTP-MDB); Massera, E. (ENEA UTTP-MDB); Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials)","","2017","","","en","abstract","","","","","","Accepted author manuscript","","","","","Electronic Components, Technology and Materials","","",""
"uuid:e7c26410-8a20-46c4-aaf9-3e5e99052baf","http://resolver.tudelft.nl/uuid:e7c26410-8a20-46c4-aaf9-3e5e99052baf","Trends in flood exposure and vulnerability: Europe 1870–2016","Paprotny, D. (TU Delft Hydraulic Structures and Flood Risk); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk); Morales Napoles, O. (TU Delft Hydraulic Structures and Flood Risk)","","2017","Objectives
Since the beginning of the second industrial revolution in the second half of the 19th century, Europe’s society and economy has been profoundly transformed. The population doubled in the last 150 years, together with more than fourfold increase in number of dwellings and 30-fold increase in production value in real terms. At the same time, rural population dropped, and share of agriculture in production declined from 30% to a mere 2%. Cities that once have been small and very densely populated evolved into less cramped, but quickly sprawling metropolitan areas. All those trends were not without effect on flood exposure and vulnerability, two crucial components of flood risk. The study aims to reevalute reported flood losses (population killed or affected, monetary value of losses, inundated area) so that for each flood event that occurred since 1870, flood losses relative to potential damage given the size of the flood event could be calculated.
Methods
In order to be able to calculate potential losses during any flood event within the study’s timeframe, a set of high-resolution maps of land use, population, production and assets distribution is needed. Firstly, such detailed maps of population and land use at 100 m resolution was compiled for year 2011/2012. From this ‘baseline’ other maps for other time points (decenially 1870–1970 and five-yearly 1975–2020) could be calculated. However, for those other time points we only know the total population and land use at regional level. Hence, for each time step, the population and the different land use classes had to be redistributed inside each region in order to match the regional totals. Several methodologies were used in order to provide the best approximation for each land use class and population. Most effort was put to estimate past and future residential urban areas (where most population lives) and lands used by agriculture and infrastructure. A database of population, land use and economy at NUTS 3 regions was compiled for this study. Estimates of production and assets were disaggregated from regional or national level to a 100 m grid based on population and land use. Information on flood events, each with a flood extent defined using NUTS 3 regions, was also collected. Finally, the exposure maps were intersected with flood zones taken from pan-European flood hazard models.
Results","flood losses; flood risk; NUTS regions","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:9ee2c258-aa9c-4ca2-9c03-44d7a6e9abc4","http://resolver.tudelft.nl/uuid:9ee2c258-aa9c-4ca2-9c03-44d7a6e9abc4","The contribution of disaster management to integrated flood risk management strategies: lessons learned from the Netherlands","Kolen, B. (TU Delft Safety and Security Science; HKV Consultants); van Alphen, J","","2017","An integrated flood risk management (IFRM) strategy consist of a comprehensive set of measures to reduce the risk: protective measures (to reduce the probability of a flood), and land use planning and disaster management (to reduce the consequences of a flood. In the Netherlands this is called a ‘multiple layer safety approach’, other countries refer to ‘multiple lines of defence’. In the development of IFRM strategies one of the main challenges is to define the contribution of disaster management to the reduction of risk, especially when experience with floods is rare and flood awareness is limited.","floodrisk management; disaster management; evacuation strategy","en","abstract","","","","","","","","","","","Safety and Security Science","","",""
"uuid:fdea4442-4fec-42b5-be01-cd4c46f4805f","http://resolver.tudelft.nl/uuid:fdea4442-4fec-42b5-be01-cd4c46f4805f","Forensic analyses and hindcasting of the Breitenhagen levee failure","Kool, J.J. (TU Delft Hydraulic Structures and Flood Risk); Kanning, W. (TU Delft Hydraulic Structures and Flood Risk); Jommi, C. (TU Delft Geo-engineering); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk)","","2017","The hindcasting of levee failures can provide valuable information about levee strength, strength models and dominant factors that contribute to failure. It is however not always clear how and why a levee failed as evidence (such as detail subsoil composition) is not present anymore.","Flood defences; Forensic analyses; Statistical analyses","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:b56ecaa6-80a8-46b0-aef8-f7487d7d5a13","http://resolver.tudelft.nl/uuid:b56ecaa6-80a8-46b0-aef8-f7487d7d5a13","Real time floodrisk management","Kolen, B. (TU Delft Safety and Security Science; HKV Consultants); Zethof, Marit (HKV Consultants); de Bruijn, Karin (Deltares); Hazenoot, Evert (Waterschap Rivierenland)","","2017","The central issue for authorities (as well as the public) is how and when to respond to forecasted extreme water levels on rivers, lakes and along the coast and large-scale flooding is an actual risk. The decision-making process is influenced by contradicting information, overloads and gaps in information, rumours, uncertainties in forecasts, the consequences of a flood and the effectiveness of measures. Emergency measures can be taken to reduce the probability of flooding(e.g. placing sand bags), other measures can be taken to reduce the consequences of a flooding (such as evacuation of inhabitants). For many of these measures, decisions are made days or hours prior to the expected moment of occurrence of the flooding. Using forecasts of water levels, by definition uncertain, and forecasts of the strength of levees, decisions can be made based on the acceptability of the actual flood risk level. The concept of risk can be used to prioritise measures in case of limited time.","emergency management; flood risk; uncertainty; mapping","en","abstract","","","","","","","","","","","Safety and Security Science","","",""
"uuid:0f8efd93-6415-4b33-baf2-53ffa12bb956","http://resolver.tudelft.nl/uuid:0f8efd93-6415-4b33-baf2-53ffa12bb956","Organizational Learning to Unleash Creative Capacity of Contractors","Tromp, E. (TU Delft Policy Analysis; Deltares); Bots, P.W.G. (TU Delft Policy Analysis)","","2017","In the Netherlands, technical innovations for dike strengthening rarely become mainstream. A case study of the redesign process of the dike between Kinderdijk and Schoonhovenseveer suggests that benefitting from the creative capacity of contractors requires organizational learning.","Organizational learning; Innovations; Flood Defences","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:ca2a919d-adf8-410d-b079-3171a7e47954","http://resolver.tudelft.nl/uuid:ca2a919d-adf8-410d-b079-3171a7e47954","Compensation for spatial flood measures in Austria, Germany, and the Netherlands: A social justice perspective","Doorn, N. (TU Delft Ethics & Philosophy of Technology); Hartmann, T (Universiteit Utrecht); Thaler, Thomas (BOKU-University of Natural Resources and Life Sciences)","","2017","In view of the anticipated climate change, many countries face increasing risks of flooding. In many countries, flood protection measures will need to be taken in the coming years to protect flood prone areas from the increased risk of flooding. Since the end of the 20th century, the traditional hard flood protection measures are increasingly complemented with land use and spatial instruments.","regulatory taking; loss; compensation; spatial measures","en","abstract","","","","","","","","","","","Ethics & Philosophy of Technology","","",""
"uuid:54774cc1-0458-44d7-8310-1c885ab4e192","http://resolver.tudelft.nl/uuid:54774cc1-0458-44d7-8310-1c885ab4e192","Decision-making in the case of a flood-threat","Veerhuis, Lex (HKV Consultants); Kolen, B. (TU Delft Safety and Security Science; HKV Consultants); Kok, M. (TU Delft Hydraulic Structures and Flood Risk; HKV Consultants); Riedstra, D. (Ministry of Infrastructure and the Environment)","","2017","Design-criteria for flood-defences have a legal character in the Netherlands. Formerly, these flood protection standards were based on design-waterlevels, where a flood defence was implicitly supposed not to fail below this waterlevel. Since knowledge regarding dike-failure improved, a new risk approach has been developed based on a social cost-benefit analysis which addresses a monetary value to a (prevented) fatality. Also, loss of life is part of the risk analysis. The main improvement of the new approach is the explicit inclusion of failure probabilities in flood-risk calculations. A recent floodrisk study showed the risk of flooding for some regions in the Netherlands is larger than previously thought [Rijkswaterstaat 2015].","","en","abstract","","","","","","","","","","","Safety and Security Science","","",""
"uuid:c86d79c7-85e6-4e0d-ace5-0b83720ed523","http://resolver.tudelft.nl/uuid:c86d79c7-85e6-4e0d-ace5-0b83720ed523","Optimization of flood risk reduction through multiple lines of defence","van Berchum, E.C. (TU Delft Hydraulic Structures and Flood Risk); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk); Timmermans, Jos (TU Delft Policy Analysis); Brody, S.D. (Texas A&M University at Galveston)","","2017","loods can have a huge impact on the regions they affect. The impact of these disasters can be reduced with a flood risk management system. Flood-prone regions often require a combination of interventions to reduce the risk to an acceptable level. The amount of risk reduction provided by various interventions can be quantified using probabilistic risk analysis.","flood defences; Flood risk reduction; economic optimization; flood risk modelling","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:ecc2a78e-675d-4af3-8f67-840a27d2063d","http://resolver.tudelft.nl/uuid:ecc2a78e-675d-4af3-8f67-840a27d2063d","Local smoothing edge preserving filters","Al-sawaf, F. (TU Delft Structural Integrity & Composites); Groves, R.M. (TU Delft Structural Integrity & Composites)","","2017","Mathematical research breakthroughs, in the domain of image processing filters, were recently accomplished by combining non-local means smoothing operations with polynomial regression techniques. We show how inherently noisy speckle interferograms can benefit from these methods, which have been shown to achieve near-optimal noise removal, while maximally preserving edge information corresponding to phase jump locations in optically captured phase fields.","","en","abstract","","","","","","","","","","","Structural Integrity & Composites","","",""
"uuid:d56c47d7-b76e-41c4-ad1e-f69cf3d9f5a4","http://resolver.tudelft.nl/uuid:d56c47d7-b76e-41c4-ad1e-f69cf3d9f5a4","Transparent Restoration","Barou, L. (TU Delft Applied Mechanics); Bristogianni, T. (TU Delft Applied Mechanics); Oikonomopoulou, F. (TU Delft Structural Design & Mechanics)","","2017","This paper investigates the application of structural glass in restoration and conservation practices in order to highlight and safeguard our built heritage. Cast glass masonry is introduced in order to consolidate a half-ruined historic tower in Greece, by replacing the original parts of the façade that are missing. Dry connections between the elements contribute to a completely reversible system that complies with the conservation guidelines suggested by the Venice Charter, while the interlocking nature of the glass units ensures the overall stability and the desired structural consolidation of the monument.","restoration; structural glass; cast glass; dry connection; interlocking geometry; reversibility","en","abstract","","","","","","","","","","","Applied Mechanics","","",""
"uuid:ebf7e31f-cb59-421f-944b-df88634217a5","http://resolver.tudelft.nl/uuid:ebf7e31f-cb59-421f-944b-df88634217a5","Refitting Vacancy for the Creative Industry: A Strategy to Create and Maintain a Creative Community","Geraedts, Rob P. (TU Delft Design & Construction Management); Remøy, H.T. (TU Delft Real Estate Management); van der Hoek, A.","","2017","The high vacancy rate in the office building market in the Netherlands is mainly explained by an overproduction of office space. The demand is expected to decrease further due to aging of the population, a changing economy and the decreasing need for space. A possible new end-user is the creative industry. The different working standards of this industry lead to different use of office space than the large-scale offices of the production economy. Adaptive reuse can create a solution for the need of new accommodations in this part of the office market. In this research a strategy has been developed that explains which characteristics a vacant office building must meet to be reused for the creative industry, which facilities it must offer and how tenants should be selected and managed. The possibilities have been researched by a detailed literature research, three in-depth case studies with successful redevelopments for the creative industry in Eindhoven, Rotterdam and Amsterdam and interviews with several experts in practice.","Adaptive reuse; Creative industry; Office buildings; Strategy; Sustainable","en","abstract","","","","","","","","","","","Design & Construction Management","","",""
"uuid:9109aa94-3961-47ce-9f81-97b15f317efd","http://resolver.tudelft.nl/uuid:9109aa94-3961-47ce-9f81-97b15f317efd","Improving CRE decision making at Oracle: Implementing the PAS procedure with a brute force approach","De Visser, Hylke; Arkesteijn, M.H. (TU Delft Real Estate Management); Binnekamp, R. (TU Delft Real Estate Management); de Graaf, R.P. (TU Delft Real Estate Management)","","2017","Purpose–Alignment of corporate real estate to a corporation’s business strategy is a long-standing issue. In the past multiple models have been developed to support this process, but research shows that they fall short on certain parts of the CRE alignment activity, often lack transparency and fail to choose the real estate strategy that delivers most value to the organisation. The Preference-based Accommodation Strategy (PAS) procedure has been proposed as a solution to these issues and results in two pilots are positive. However, to optimise the results, a brute force approach should be implemented in the procedure. This paper reports on a pilot study wherein this PAS procedure 3.0 was tested and evaluated.
Approach–A literature study is conducted to develop a theoretical basis for the implementation of a brute force approach in the PAS procedure. This procedure is implemented in a pilot study by building a mathematical model. During the pilot the users improved the reflection of their preferences in the model, in an iterative process of manually designing portfolio alternatives. A brute force approach is applied to the final model to yield the optimum portfolio alternative. The implementation of the brute force approach is evaluated and it is determined if the approach yields a higher preference rating than the stakeholders can achieve by manual design.
Findings–The pilot study shows that the brute force approach is able to improve the results over the manual design and yields a 7% increase in the real estate alignment compared to the current portfolio. The evaluation results reveal that the implementation process results in acceptance of- and trust in the model. Moreover, the users are very positive about the PAS and indicate that the model better reflects their preferences than their current process. They even indicate that they want to incorporate the tool in their daily decision-making process.
Implications–This pilot study was less complex than previous pilots, therefore the PAS procedure 3.0 should be tested in more complex pilots to discover the boundaries of the brute force approach but to use it where possible. This pilot study has shown that the PAS procedure 3.0 is able to improve the corporate real estate (CRE) decision-making process and hereby improve the corporate real estate (CRE) alignment. This will result in more added value of real estate to the businesses in which the tool is used.","Corporate real estate management; Preference measurement; CRE Alignment; Decision support systems; Decision-making","en","abstract","","","","","","","","","","","Real Estate Management","","",""
"uuid:99a01965-b5dc-4e82-a37a-b1ef6891be16","http://resolver.tudelft.nl/uuid:99a01965-b5dc-4e82-a37a-b1ef6891be16","Re-thinking Istanbul's waterfronts: Halicport and Galataport projects","Tanis, F. (TU Delft OLD History of Architecture & Urban Planning)","","2017","","","en","abstract","","","","","","","","","","","OLD History of Architecture & Urban Planning","","",""
"uuid:49a802e0-f4b6-4a98-a6db-0b0b509f1d5e","http://resolver.tudelft.nl/uuid:49a802e0-f4b6-4a98-a6db-0b0b509f1d5e","What is served for breakfast?: An empirical analysis of CRE strategies and organizational culture","Nase, I. (TU Delft Real Estate Management); Arkesteijn, M.H. (TU Delft Real Estate Management)","","2017","The quote Culture eats strategy for breakfast was made famous by Mark Field, president at Ford, in 2006 and has ever since been a guiding principle in management practice of corporations operating across the globe. General management profession has widely embraced culture as a key factor in strategy design. However, in corporate real estate (CRE) management it appears to be implicit within organizational differences at best or lacking proper consideration at worst. Analyzing the interrelationships between corporate real estate strategies and organizational culture is essential for delivering value to multinationals.
and crossing of organizational boundaries require re-evaluation of
both workplace design and service delivery. However, the processes and
structures of workplace management are still traditional and managers,
together with outsourced service providers, often fail to serve the needs
of mobile employees.","Workplace development; Mobile work; Services; Servitization; Business models","en","abstract","","","","","","","","","","","Real Estate Management","","",""
"uuid:8193601c-367b-4018-b1fd-9c21543b4207","http://resolver.tudelft.nl/uuid:8193601c-367b-4018-b1fd-9c21543b4207","ShoreScape: sustainable co-evolution of the natural and built environment along sandy shores","Wijnberg, K.M.; Nijhuis, S. (TU Delft Landscape Architecture); Hulscher, SJMH; van Bergen, J. (TU Delft Landscape Architecture); Meyer, Han (TU Delft OLD Urban Compositions); Hoonhout, B.; Janssen, M.; Hoekstra, J.D.; de Groot, A.V.; Goessen, P.; van Gelder-Maas, C.","","2017","The land-sea interface is a very attractive location for humans to settle. In the case of low lying, sedimentary coastlines this can be a risky location, as these shorelines are inherently dynamic in nature. Accelerating rates of relative sea level rise will increase coastal erosion, creating world-wide growing demands for coastal protection along urbanized shores. Starting point of this project is that the key to sustainably adapt to this situation is to be found in smart, pro-active sediment management using ‘building-with-nature’ (BwN) approaches, rather than in traditional reactive approaches involving expansion of static, hard coastal defense structures.","","en","abstract","","","","","","","","","","","Landscape Architecture","","",""
"uuid:47a8f8ed-feb1-4e89-a032-ab712ad69dff","http://resolver.tudelft.nl/uuid:47a8f8ed-feb1-4e89-a032-ab712ad69dff","Meta-Corporate Real Estate Management: Some preliminary thoughts","Heywood, Christopher (University of Melbourne); Arkesteijn, M.H. (TU Delft Real Estate Management)","","2017","Purpose: This paper advances the concept of meta-Corporate Real Estate Management (metaCREM) as an adjunct to existing knowledge work in the field. It argues for its existence and relevance, and suggests a number of areas where research with such a focus could occur to advance knowledge in the field.
Method: The method is what might be called a 'reflective argument' based on the authors’ lengthy engagement in the field and their recent metatheoretical work on CREM.
Findings: MetaCREM is identified together with multiple meta-objects that are forms of meta-work applicable to metaCREM. This established that meta-work already occurs in CREM. A landscape of potential areas for research was identified that encompassed existing work and potential areas of future endeavour.
Implications: The paper's implications are largely for theory and theorisation. Relevance to practice is secondary through potential improvements to theorisation of problems that may flow on to practice.
Sediment management measures are becoming increasingly popular as they are considered sustainable from both economic and environmental point of view. For example, aimed at counteracting river bed degradation, sediment nourishments have been carried out in the German reaches of the Rhine river while a nourishment pilot study has recently taken place at the Dutch Rhine and a nourishment project has been scheduled for the Danube by the Austrian water management authorities. Moreover, sediment management measures are implemented in various ecological restoration projects (e.g. Trinity river in U.S. and Nunome river in Japan) as sediments and their characteristics form the habitats of the biota, as well as in river training projects around the world.","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:f17977b4-b1a0-466f-b586-98345fa0d2bc","http://resolver.tudelft.nl/uuid:f17977b4-b1a0-466f-b586-98345fa0d2bc","Causes of long-term bed degradation in rivers: Setup of research","Siele, Meles (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Blom, A. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Frings, R. (Rheinisch-Westfälische Technische Hogeschool); Viparelli, Enrica (University of South Carolina)","","2017","style=""margin: 0cm 0cm 10pt;"">The main objective of this research is to improve our understanding of the relative contribution of the causes of long-term bed degradation in Rhine and other degrading rivers. That is, the research is intended to quantify past channel adjustment processes, mainly bed degradation and bed surface coarsening over time and space, and to predict future trends, in bed elevation and bed surface texture, resulting from past interventions. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:a15480b4-6798-40ac-ab94-e166d42d568f","http://resolver.tudelft.nl/uuid:a15480b4-6798-40ac-ab94-e166d42d568f","Influence of Salinity on the Coastal Turbidity Maximum in the Southern Bight of the North Sea","Nguyen, D. (Antea Group; Flanders Hydraulics Research); Vanlede, J.D.S.M. (TU Delft Environmental Fluid Mechanics; Flanders Hydraulics Research); de Maerschalck, B (Flanders Hydraulics Research)","","2017","In the Southern Bight of the North Sea, a Coastal Turbidity Maximum (CTM) can be observed in the Belgian coastal area around the port of Zeebrugge. Understanding the dynamics of this turbidity maximum is of great importance in coastal zone management. Our research studies the CTM with a numerical process model","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:2b1c9b0c-1c1d-41a9-8bce-7f302491aa7b","http://resolver.tudelft.nl/uuid:2b1c9b0c-1c1d-41a9-8bce-7f302491aa7b","Mud dynamics in the harbor of Zeebrugge","Vanlede, J.D.S.M. (TU Delft Environmental Fluid Mechanics; Flanders Hydraulics Research); Dujardin, Arvid (Flanders Hydraulics Research; Antea Group); Fettweis, Michael (Operational Directorate Natural Environment)","","2017","One year of SPM concentration (SPMC) and Velocity data are analyzed to gain insight in the mud dynamics in the harbor of Zeebrugge. Seasonal dynamics are inferred from satellite images, depth soundings and SPMC data.","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:9aa5d468-a790-468a-b1a3-088c215aa8d1","http://resolver.tudelft.nl/uuid:9aa5d468-a790-468a-b1a3-088c215aa8d1","Closure of offtakes in Bangladesh: Use of numerical models to overcome data scarcity for the initial assessment of remedial measures","Vila-Santamaria, R.; de Jongste, A.L. (Witteveen+Bos); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","","2017","Variable flows and fast morphological changes characterize the river system of Bangladesh, which includes the downstream reaches and delta of the Ganges and Brahmaputra rivers, two of the largest rivers in the world. In contrast, fresh water supply around the country largely depends on much smaller distributaries that take off from those large rivers. With the arrival of the dry season and the drop of water levels in the rivers, some of the distributaries become disconnected during several months from their parent rivers because of aggradation at the offtake during the monsoon season. Analysing the evolution of such offtakes from a morphodynamic perspective is fundamental for the definition of effective measures to prevent their closure. However, bed elevation data required to perform such analyses are rarely available, and bathymetric surveys of large rivers are costly and quickly outdated by fast morphological changes. Physics-based numerical models provide a way to fill the gap of unavailable data, while also allowing to explore river morphodynamics beyond the setting of existing rivers.","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:9f7bbd33-6a43-4d98-8bdc-b0377bdee012","http://resolver.tudelft.nl/uuid:9f7bbd33-6a43-4d98-8bdc-b0377bdee012","Planning Manuals as Tools for Modernization and Nation Building: The circulation of ideas through German-speaking architects and urban planners in Turkey, 1923-1950","Tanis, F. (TU Delft 100% Research; TU Delft History, Form & Aesthetics); Hein, C.M. (TU Delft History, Form & Aesthetics); van Bergeijk, H.D. (TU Delft History, Form & Aesthetics)","","2017","In the early 20th century, the modern movement triggered the international circulation of knowledge through architects and urban planners. One mode of this dissemination was the invitation of French- and German-speaking architects and urban planners to build modern cities in foreign countries. A notable example was the case of Turkey. Between 1923 and 1950, a number of German-speaking architects and urban planners had considerable impact on the country’s built environment. During this period, German building manuals became tools for the dissemination of architectural ideas and consequently played a crucial role in modernization of the Turkish nation, founded in 1923. This paper investigates the function of the building manual in the process of nation building in the early republican period in Turkey. Through an analysis of key publications, including Camillo Sitte’s Der Städte-Bau nach seinen künstlerischen Grundsätzen; Reinhard Baumeister’s “Stadt-Erweiterungen in technischer, baupolizeilicher und wirthschaftlicher Beziehung”, Theodor Fischer’s Sechs Vorträge über Stadtbaukunst, the paper offers an analysis of the key figures and ideas involved in this process, and the relationship between architectural and political ideals that emerged through the manuals.
The new Turkish Republic sought to establish itself as a modern nation that was distanced from the Ottoman Empire. The invitation of foreign experts to advise on the design and planning of Turkish cities was part of this modernization process: for example, Carl Christoph Lörcher was assigned to work on Ankara’s plan in 1924, Herman Jansen’s plan for Ankara came into effect in 1928. In addition to working directly with the government, these practitioners were also involved in the development of the Turkish architectural education system. Ernst Egli, for example, was assigned as a professor to Istanbul Fine Arts University in order to reshape the architecture programme. The influence of German architects continued during the Second World War. When the Nazis took power in 1933, a number of German professors began to work at the Turkish universities. German speaking professors also worked as practicing architects, such as Clemens Holzmeister, Martin Wagner, Hans Poelzig, Bruno Taut, Paul Bonatz, etc. These figures introduced key European ideas, including the Siedlung and the “Garden City”, in written and built form which subsequently influenced the production of Turkish manuals, and thus influenced the construction of the modern nation.
The circulation of the ideas during this construction has been seen in several directions. The architects and urban planners were invited by the government, so that they carried their knowledge which is under influence of Sitte, Baumeister, Howard etc. Sitte’s 1889 dated book Der Städtebau nach seinen Künstlerischen Grundsätzen was translated in Turkish by Celal Esat Arseven in 1926; Kemali Soylemezoglu translated the lectures of Theodor Fischer Sechs Vorträge über Stadtbaukunst (1919) in 1941, 1942 and 1945 in the Turkish magazine called “Arkitekt”.","planning manuals; modernisation; Turkey","en","abstract","","","","","","","","","","","100% Research","","",""
"uuid:11f3d80d-0da5-4566-922b-0fce0d3329c9","http://resolver.tudelft.nl/uuid:11f3d80d-0da5-4566-922b-0fce0d3329c9","Evaluation of a multi-steerable catheter for cardiac interventions in a 3D-printed heart model","Ali, A. (TU Delft Medical Instruments & Bio-Inspired Technology); de Winter, J.C.F. (TU Delft Biomechatronics & Human-Machine Control); Dodou, D. (TU Delft Medical Instruments & Bio-Inspired Technology); Breedveld, P. (TU Delft Medical Instruments & Bio-Inspired Technology)","","2017","To overcome the challenges presented by complex 3-dimensional shapes and tortuous vasculature in the cardiovascular environment, we previously developed a prototype of a multi-steerable catheter having 4 DOFs controlled by two joysticks [1]. However, it remains unknown whether the added steering possibilities are beneficial in the cardiovascular anatomy. With this research we aimed to investigate the effect of 0-DOF, 2-DOF, and 4-DOF catheter systems on surgical performance in a cardiovascular model.","","en","abstract","","","","","","","","","","","Medical Instruments & Bio-Inspired Technology","","",""
"uuid:074af0bf-9145-40f0-8d0d-ccbdc64de54f","http://resolver.tudelft.nl/uuid:074af0bf-9145-40f0-8d0d-ccbdc64de54f","Taming the Jamuna: Effects of river training in Bangladesh","Bryant, S. (University of Alberta); Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)","","2017","style=""margin: 0cm 0cm 10pt;"">The 10 km wide Jamuna river in Bangladesh is one of the most morphologically active rivers in the world, with bank erosion rates of up to 500 m per year (Mutton and Haque 2004). Such extreme river migration in the center of Bangladesh, one of the most densely populated and impoverished regions in the world, displaces roughly 60,000 people per year (Mutton and Haque 2004). To alleviate this, the Government of Bangladesh has committed to stabilizing and narrowing it’s major rivers with the Flood and Riverbank Erosion Risk Management Investment Program (FRERMIP) (ADB 2016). FRERMIP is investigating numerous training scenarios and final stabilized widths (4-8 km). These scenarios are combinations of works (spur dikes, dredging) at different locations and activation rates (i.e. construction schedules) which FRERMIP seeks to optimize for cost, navigation, bank erosion prevention and flood mitigation. However, little is understood about how these proposals may affect the sediment balances in Bangladesh. The Jamuna combines with the Ganges and Upper Meghna to form the world’s second largest delta: the Bengal delta. Due to the high sediment load delivered from these Himalayan rivers, accretion rates in the delta have been in the order of 5 km2/yr (Sarker et al. 2011). Changes in the supplied sediment to the delta may reduce this accretion, amplifying the consequences of sea level rise. A better understanding of how proposed trainings will affect the sediment supply to the delta can help decision makers weigh the pros and cons of implementation, and prepare for these impacts on the delta. ","","en","abstract","","","","","","A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:a7f0bb8c-492d-4c90-bad1-32b454f59a1e","http://resolver.tudelft.nl/uuid:a7f0bb8c-492d-4c90-bad1-32b454f59a1e","Real estate implications of transitions in Dutch health care institutions","Brand, Alexander (AAG); Bollinger, Daan (AAG); de Jong, P. (TU Delft Design & Construction Management); van der Voordt, Theo (TU Delft Real Estate Management)","","2017","Due to structural changes in laws and regulations and ways of financing, Dutch health care organisations are in a phase of reorientation and transition. As such, many strategical issues have to be solved that will influence their corporate real estate strategy. In such a dynamic context real estate represents a high risk. The transition requires increased transparency and understanding of performance. The current Dutch situation can be described as:
•Increased vacancy arouses. Hypothesis: Health care organisations prevent vacancy by disposing of or reinvestments in existing locations, with improved quality of the remaining real estate.
•Lower rates and increased uncertainty. Hypothesis: The response will consists of increased focus, demanding a proper preparation.
•A growing dilemma of lower budget for real estate and high need for investments. Hypothesis: The level of available financial resources for the renewal of the stock and guaranteed sound management is questionable.
The purpose of the research is to test these hypotheses in order to gain a better understanding of the qualitative and quantitative (financial) mutations in health care real estate and to bridge the gap between the current supply and the future demand.
To which extent are Dutch health care organisations ready to realise the transition by the introduction of new concepts, in order to meet the future demand of health care real estate?
Based on a survey, relevant real estate related data including performance parameters has been collected by AAG, a consultancy firm and shared service centre for health and care, in 2015 and 2016. This database is the starting point for benchmark analyses on the resilience and flexibility of health care organisations to provide the required transition.
The data include qualitative data about the location, building, and user experience, and quantitative information (financial, physical, features). Mapping the current situation (IST) generates a better understanding of the (im)possibilities of the health care real estate in the Netherlands (1). In order to forecast the effects of the transition it is necessary to use future scenarios (SOLL) to reveal resilience and flexibility (2). Such scenarios are qualitative as well as quantitative – determining the possible maximum investment and improvement (3). These scenarios will be hold against the actual plans of the health care organisation (4).
Over the last two decades, many governments and private companies have invested tens of billions of US Dollars in the development of geographic information, largely to serve specific communities (e.g., agriculture, urban/rural planning, and mining) within local, state, national, international, and even global contexts. The focus has increasingly shifted towards a platform for integrating geographic information by means of SDIs. SDIs facilitate access to existing geospatial data and services necessary to successfully use GIS. Moreover, SDIs facilitate the exchange and sharing of geospatial data between stakeholders within the geographic information community. This community mainly includes mapping agencies, universities, governmental and nongovernmental organizations, and private companies.
Geoportals can be considered as gateways to SDI. They are not a repository where data are simply stored, but can be seen as a one-stop shop for geospatial data, sourced from numerous agencies. The performance of geoportals can vary enormously depending on numerous factors, such as the functionalities offered, the quality of the information offered, and a user’s capacity.
In 1994, the US Federal Geospatial Data Committee (FGDC) established the National Geospatial Data Clearinghouse, aimed at facilitating efficient access to the overwhelming quantity of existing geospatial data (from federal agencies) and coordinating its exchange, with the objective of minimizing duplication (in the collection of expensive geospatial data) and assisting partnerships where common needs exist. The NGDC is considered the earliest implementation of a geoportal. Since 1994, the number of countries implementing national geoportals has steadily grown. As of February 2014, around 120 countries have an operational national geoportal in place and 12 countries initiated projects to launch a geoportal in the short-term (Crompvoets, 2016). Most countries in Asia, Europe, the Middle-East, Oceania, North America, and South America have established a geoportal for their nation, whereas most countries in Africa still have not established such a portal. However, several African initiatives to launch national geoportals appear promising. These national geoportals are evolving worldwide in tandem with national SDIs. A body of literature published in scientific/popular journals and conference proceedings describe the existing experiences (e.g., see conference papers of the Global Spatial Data Infrastructure Association).
National geoportals are continuously evolving. In this context, it is important to have a longitudinal perspective when establishing and maintaining national geoportals. A first detailed study of monitoring all national geoportals worldwide started in 2000 (Crompvoets, 2016). This paper presents the worldwide status of national geoportals in 2016.","Spatial Data Infrastructure; national geoportals","en","abstract","","","","","","Abstracts GSDI 15 World Conference Proceedings: Spatial Enablement in the Smart Homeland","","","","","OLD Geo-information and Land Development","","",""
"uuid:64ac21eb-0f2b-4cda-b8ad-75bdba2b3aec","http://resolver.tudelft.nl/uuid:64ac21eb-0f2b-4cda-b8ad-75bdba2b3aec","Integrated Real Estate Registration and Chinese NSDI to Strengthen the Government Spatial Data Management: Spatial Enablement in the Smart Homeland","Chengfeng, Luo (Chinese Academy of Surveying and Mapping); Minghui, Hao (Chinese Academy of Surveying and Mapping); Crompvoets, Joep (Katholieke Universiteit Leuven); van Loenen, B. (TU Delft OLD Geo-information and Land Development)","","2016","The China Government enacted the Provisional Regulations on Real Estate Registration (RER) in July 2015. These regulations were in full operation from the beginning of 2016. In this context, real estate refers to land, sea, houses, trees and other fixed objects which have spatial distribution and are subject to social and economic activities in the same time. The RER provides opportunities to strengthen the Chinese National Spatial Data Infrastructure (NSDI), because the RER involves spatial information which can be shared with stakeholders of the NSDI. The paper explores the relationship between the Chinese NSDI and RER in order to find a mutual way to inspire their developments in the same time. This exploration includes several issues. First, a clear definition of sharable information is necessary which helps to reduce data duplication and extend the application of Chinese NSDI. Second, there must be a common recognition and strong coordination among powerful ministries which can improve the adjustment of business processes. Third, reasonable mechanisms and feasible approaches should be explored from different perspectives to underpin the spatial governance level. Fourth, government administrators must achieve the strategic benefits of integrating RER and NSDI from multiple perspectives, and fifth the influence and profile should be evaluated based a long term consideration. The development of NSDIs is a dynamic process and the performance of RER is a key point for the Chinese NSDI. By integrating RER, the Chinese NSDI can penetrate to the actual process of government management and improve the capability of spatially assistant decision-making.","NSDI; China; real estate registration; government spatially management","en","abstract","","","","","","Abstracts GSDI 15 World Conference Proceedings: Spatial Enablement in the Smart Homeland","","","","","OLD Geo-information and Land Development","","",""
"uuid:6bdb1ed9-2191-43f5-818b-70c0ac2b0f24","http://resolver.tudelft.nl/uuid:6bdb1ed9-2191-43f5-818b-70c0ac2b0f24","Blueprint for the STIG1.0: Defining core SDI principles and setting up performance indicators","Nushi, B. (TU Delft OLD Geo-information and Land Development); van Loenen, B. (TU Delft OLD Geo-information and Land Development); Crompvoets, Joep (Katholieke Universiteit Leuven)","","2016","Spatial Data Infrastructures (SDIs) have been developed over the last decades all over the world. SDI is the integration of several components to create a platform which enables a wide variety of stakeholders to access, share and use spatial data in an efficient and effective way. To stimulate the SDI development effectively and efficiently, it is key to assess the progress and benefits of the SDI. Currently, several SDI assessment methods exist. However, most assessment methods are analyzing the SDI as a whole, which does not allow understanding their internal dynamics and none of these appear to meet the requirements of practitioners. Thus, SDI decision makers are still without any guidance on the success of their SDI.","","en","abstract","","","","","","Abstracts GSDI 15 World Conference Proceedings: Spatial Enablement in the Smart Homeland","","","","","OLD Geo-information and Land Development","","",""
"uuid:e3bfe15a-b100-4a5e-b204-e36d6a31bedf","http://resolver.tudelft.nl/uuid:e3bfe15a-b100-4a5e-b204-e36d6a31bedf","Urban Correlationism: A Matter of Access","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2016","","","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:ea874d1d-9b2b-4510-a446-ae9caec4fcac","http://resolver.tudelft.nl/uuid:ea874d1d-9b2b-4510-a446-ae9caec4fcac","Deep ocean sound speed characteristics passively derived from the ambient acoustic noise field","Evers, Laeslo G (Royal Netherlands Meteorological Institute (KNMI)); Wapenaar, C.P.A. (TU Delft ImPhys/Acoustical Wavefield Imaging; TU Delft Applied Geophysics and Petrophysics); Heaney, Kevin D (OASIS Inc.); Snellen, M. (TU Delft Aircraft Noise and Climate Effects)","","2016","The propagation of acoustic waves in the ocean strongly depends on the temperature. Low frequency acoustic waves can penetrate the ocean down to depths where few in-situ measurements are available. It is therefore attractive to obtain a measure of the deep ocean temperature from acoustic waves. The latter is especially true if the ambient acoustic noise field can be used instead of deterministic transient signals. In this study the acoustic velocity, and hence the temperature, is derived in an interferometric approach from hydrophone array recordings. The arrays were separated by over 125 km, near Ascension Island in the Atlantic Ocean, at a depth of 800m. Furthermore, the dispersive characteristics of the deep ocean sound channel are resolved based on the retrieved lag times for different modes. In addition, it is shown how the resolution of the interferometric approach can be increased by cross correlating array beams rather than recordings from single-sensor pairs. The observed acoustic lag times between the arrays corresponds well to modeled values, based on full-wave modeling through best-known oceanic models.","","en","abstract","","","","","","","","","","","ImPhys/Acoustical Wavefield Imaging","","",""
"uuid:7a7a5d24-1b58-4e58-aa33-b9b527ea7b41","http://resolver.tudelft.nl/uuid:7a7a5d24-1b58-4e58-aa33-b9b527ea7b41","Application of seismic interferometry by multidimensional deconvolution to ambient seismic noise recorded in Malargüe, Argentina","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Ruigrok, Elmer (Royal Netherlands Meteorological Institute (KNMI)); Huniziker, Jürg (University of Lausanne); Gomez, Martin (Argentina National Atomic Energy Commission); Wapenaar, C.P.A. (TU Delft ImPhys/Acoustical Wavefield Imaging; TU Delft Applied Geophysics and Petrophysics)","","2016","Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, these seismic interferometric responses are retrieved by simple crosscorrelation of recordings made by separate receivers: a first receiver acts as a 'virtual source' whose response is retrieved at the other receivers. When surface waves are retrieved, the newly retrieved responses can be used to extract receiver-receiver phase velocities. These phase velocities often serve as input parameters for tomographic inverse problems. Another application of SI exploits the temporal stability of the multiply scattered arrivals (the coda). For all applications, however, the accuracy of the retrieved responses is paramount. In practice, this accuracy is often degraded by irregularities in the illumination pattern: correct response retrieval relies on a uniform illumination of the receivers. Reformulating the theory underlying seismic interferometry by crosscorrelation as a multidimensional deconvolution (MDD) process, allows for correction of these non-uniform illumination patterns by means of a so-called point-spread function (PSF). We apply SI by MDD to surface-wave data recorded by the Malargüe seismic array in western Argentina. The aperture of the array is approximately 60 km and it is located on a plateau just east of the Andean mountain range. The array has a T-shape, which makes it very well suited for the application of SI by MDD. We select time windows dominated by surface-wave noise traveling in a favorable direction, that is, traversing the line of virtual sources before arriving at the receivers at which we aim to retrieve the virtual-source responses. These time windows are selected based upon the slownesses along the two receiver lines. From the selected time windows, virtual-source responses are retrieved by computation of ensemble-averaged crosscorrelations. Similarly, ensemble-averaged crosscorrelations between the positions of the virtual sources are computed: the PSF. We use the PSF to deconvolve the effect of illumination irregularities and the source function from the virtual-source responses retrieved by crosscorrelation. The combined effect of time-window selection and MDD results in more accurate and temporally stable surface-wave responses.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:97184474-9a44-4ca1-bd90-cc8aa10474af","http://resolver.tudelft.nl/uuid:97184474-9a44-4ca1-bd90-cc8aa10474af","Resilience of Dwellings and the Creation of Livable Historical Residential Areas in China","Zhu, K. (TU Delft History, Form & Aesthetics)","","2016","There are numerous traditional residential buildings in China, but only in the last sixty years have academics studied historic dwellings. Currently,
there are four metropolises, Beijing, Shanghai, Guangzhou, Shenzhen in mainland China, and with a number of unique traditional residential areas,
such as Hutong, Linong, and Qilou. In 1928, due to Liang Sicheng’s contribution, the first Department of Architecture in China was established
and Western theories of conservation were introduced as well. However, due to the Chinese Cultural Revolution, preservation activities were
interrupted in the 1950s. Also, beginning in the middle of the twentieth century, because of their ambition to develop the economy, Chinese elites
attempted to expand their cities and transformed these places in response to the demands of urbanization. Despite learning from the experiences
of other countries, an effective and harmonious development situation has not yet been established in China. The application of preservation
concepts began again in the 1980s by the government; however, most contemporary architectural scholars have no clear knowledge about modern
conservation theories. Even the researchers who have roots in this field might not appropriately explain and apply these theories in practice. From
1997 to 2008, some residential areas were preserved and listed as World Heritage Sites, such as the Ancient City of Pingyao and the Old Town of
Lijiang. All of these sites are located in rural or suburban areas. Comparatively, in urban areas, some inhabitants are suffering from poor living
conditions in high-density neighbourhoods. Indeed, this has become a common phenomenon in China’s cities. Development of modern cities is
a process of capital operation. If residents who live in these historic dwellings or inhabitants who are affected by the circumstances and sites of
those old buildings do not pay attention to protection issues of the traditional dwellings, then our common culture and history will eventually
be eroded. The significance of protection lies not simply in displaying these historic residences, but in continually using sustainable renovation
methods, and maintaining their own characteristics. Moreover, in the developing process, because of shortage of issues of funding, housing
property and ambitions from governments and capitalists, attention to inhabitants’ real lives in the remaining residences will not be seriously
concerned. Accordingly, in this research, answering how to support the sustainable development of traditional residential areas will include an
overview of the history of heritage, dwellings, and neighbourhood preservation, its shifting values, goals, tools, and techniques, and their influence
on preservation activities over the last sixty years in China. First, this study will make an argument about the specific implications of the theories,
principles and values of preservation and their changes. It will also analyze case studies— mainly in Shanghai, Pingyao and Yangzhou — to record
and classify different obstacles in preserving processes and the sustainable development of historical dwellings. With these steps, this study aims to
strike a balance between the preservation of historic dwelling structures and recreating approaches for continuous use in order to benefit both the
economic growth in cities and inhabitants’ lives in historical dwellings.","","en","abstract","","","","","","","","","","","History, Form & Aesthetics","","",""
"uuid:56f30e7c-8baf-4ba2-b2aa-205e5546a1e0","http://resolver.tudelft.nl/uuid:56f30e7c-8baf-4ba2-b2aa-205e5546a1e0","Ulysses’s ship: Becomings of an architectural mind","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2016","","","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:9442720b-f92d-4b41-bc5a-2fa87b47896f","http://resolver.tudelft.nl/uuid:9442720b-f92d-4b41-bc5a-2fa87b47896f","Urban Correlationism: A Matter of Access","Kousoulas, Stavros (TU Delft Theory, Territories & Transitions)","","2016","","","en","abstract","","","","","","","","","","","Theory, Territories & Transitions","","",""
"uuid:92e7726e-c8bb-4de9-b472-c04cf4dcfbc0","http://resolver.tudelft.nl/uuid:92e7726e-c8bb-4de9-b472-c04cf4dcfbc0","Changing realities: Traumatic urbanism as a mode of resilience in intra-war Beirut","Hanna, J.M.K. (TU Delft History, Form & Aesthetics)","","2016","In 1975, and in an ambiance of increasing tension, the streets of Beirut served as a stage for a series of violent events and in a matter of days, the sounds of mortar shells and machine guns provided an applied interpretation of the conflicting interests of the different Lebanese and global political players. With few intermissions and a fluctuating intensity, the urban warfare continued for the following 15 years, and resulted in massive destructions and significant movement of citizen’s displacement. Following its instinct to survive and as a reaction to the on-going conflict, Beirut induced new forms of urbanism to maneuver through the imposed reality. The city became divided into two sides, and the once cosmopolitan vibrant city center, developed into an uninhabited green buffer between the rivals. Checkpoints were introduced to re-mark the acquired territories and the citizens’ relation to their public space was redefined by the fields of snipers’ fire. This metamorphosis of the city, together with the irregular and inconclusive nature of the conflict increased Beirut’s immunity to a fatal end. During the 15 years course of the conflict hopes were revived with every ceasefire and few reconstruction plans were developed. This presentation looks into the spatial production in Beirut under the traumatic conditions of the Lebanese civil war. It argues that the continuous process of spatial production which is displayed in the rearrangement of spaces and everyday urban practices is in itself a demonstration of resilience. It further looks into the opportunities generated by the conflict and how it revealed the shortcomings of the pre-war urban practices. Finally, the presentation builds comparisons between the city’s
resilience in intra- and post-war periods through questioning the inclusive and reconciliatory capacity of the implemented reconstruction projects.","Changing Realities; Traumatic urbanism; resilience; Beirut","en","abstract","","","","","","International Planning History Society Proceedings - History Urbanism Resilience, Vol. 3: Change and Responsive Planning","","","","","History, Form & Aesthetics","","",""
"uuid:fbe53e2a-8c77-417b-9f66-d9960026cab4","http://resolver.tudelft.nl/uuid:fbe53e2a-8c77-417b-9f66-d9960026cab4","Demand forecast for industrial land: Inaccurate and biased?","Louw, E. (TU Delft OLD Urban and Regional Development); Olden, Han","","2016","","Demand forecasts; Industrial land; Planning","en","abstract","","","","","","","","","","","OLD Urban and Regional Development","","",""
"uuid:143f423f-b3e2-4429-9498-3beaeaae96c4","http://resolver.tudelft.nl/uuid:143f423f-b3e2-4429-9498-3beaeaae96c4","Additively manufactured porous biomaterials and implants","Zadpoor, A.A. (TU Delft Biomaterials & Tissue Biomechanics)","","2016","","","en","abstract","","","","","","","","","","","Biomaterials & Tissue Biomechanics","","",""
"uuid:ed52f432-7fc5-4e29-b454-4145cf8644eb","http://resolver.tudelft.nl/uuid:ed52f432-7fc5-4e29-b454-4145cf8644eb","Utilizing AE data and stochastic modelling towards fatigue damage diagnostics and prognostics of composites","Loutas, T. (University of Patras); Eleftheroglou, N. (TU Delft Structural Integrity & Composites)","","2016","The procedure of damage accumulation in composite materials, especially during fatigue loading, is a complex phenomenon which depends on a number of parameters such as ply orientation, material properties, geometrical non-linearities etc. Towards condition based health monitoring and decision making, the need not only for diagnostic but also for prognostic tools rises and draws increasing attention the last few years. The damage process is in general hidden and manifests itself through in-situ structural health monitoring (SHM) data. Due to the hidden nature of the damage accumulation, non-homogenous hidden Semi Markov process (NHHSMP) seems to be a suitable candidate for describing adequately the aforementioned system’s degradation in time. Its non-homogeneous aspect takes into account the system’s ageing. Moreover, the sojourn times in each state are assumed to be generally distributed, not necessarily exponentially distributed, which is a more realistic assumption for real world engineering systems. The SHM observations are coming from acoustic emission (AE) data recorded throughout constant amplitude fatigue testing of open-hole carbon/epoxy coupons. The scatter of the cycles to failure reported is quite large, an expected result of the stochasticity in the material properties and material inhomogeneities. A maximum likelihood approach for the estimation of the model parameters is followed and useful diagnostic and prognostic measures such as the coupon's current degradation level as well as measures the coupon's remaining useful life (RUL) are proposed for the monitoring of structural integrity of composite materials.","composite materials; structural health monitoring; stochastic modeling; fatigue; acoustic emission","en","abstract","","","","","","","","","","","Structural Integrity & Composites","","",""
"uuid:ea4c851a-94bd-40f3-b71d-885c1eaff00c","http://resolver.tudelft.nl/uuid:ea4c851a-94bd-40f3-b71d-885c1eaff00c","Imaging an unknown object in an unknown medium","Snieder, R (Colorado School of Mines); Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics)","","2016","Imaging an unknown object in a medium that is known, such as a medium with constant velocity, is not difficult because one knows exactly where the waves are when they interact with the object. It is much more challenging to image an object in an unknown medium, because in that case one may know the waves that one sends into the medium, but one may does not know the waves that illuminate the object because the waves are distorted during their propagation to the object and back. Yet in many applications the medium is strongly scattering and the wavefield is strongly distorted as it propagates to the object. This is like imaging through frosted glass. How can one create an image in such media? And related to this, how can one focus a wavefield through a complicated medium that one does not know? Inverse scattering methods, as developed in quantum mechanics[1, 2], make it possible to estimate the model or object at a prescribed location without knowing the medium between that location and the point where reflected waves are recorded. These inverse scattering methods are known as the Marchenko equation or Gel’Fand-Levitan equation. Recently, these inverse scattering methods have been generalized to applications in seismology[3, 4, 5, 6] where one seeks to image a target, such as a reservoir, under a complicated overburden, such as a salt body. The main issue we will address is how it is possible that one can image the object at one location without knowing the medium between the observation point and the reconstruction point. The reason why inverse scattering make it possible to do this is that these methods involve an integral equation[7], and the function that one solves for is akin to the Green’s function for the unknown medium. The function obtained by solving the Marchenko equation is, in fact, the incident wavefield that will focus the waves at a specified target location. In order to solve this integral equation one only needs to know a smooth estimate of he velocity model and the reflected waves recorded at the acquisition surface, but the details of the complexity of the medium need not be known. That means there exists a recipe to determine, given the reflected waves, the incident wavefield that focuses at a specified target point. Such focusing is exactly what is needed to determine the image at the target point. There are many applications in geophysics where one seeks to create an image in strongly scattering media. These include hydrocarbon reservoirs under a complicated overburden, the interior of volcanoes, possibly the core mantle boundary, and crustal structure from high-frequency seismic waves.","imaging; inverse scattering","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:9ba1af0b-410c-43ae-b4ad-28bf8499b689","http://resolver.tudelft.nl/uuid:9ba1af0b-410c-43ae-b4ad-28bf8499b689","Planning as curating everyday micro-contexts for a better public policy in the Favelas: The case of the Favela School of Architecture","Chagas Cavalcanti, A.R. (TU Delft OLD Woningbouw)","","2016","","","en","abstract","","","","","","","","","","","OLD Woningbouw","","",""
"uuid:35179b4f-8e77-4b1d-b237-f66acdd5c90a","http://resolver.tudelft.nl/uuid:35179b4f-8e77-4b1d-b237-f66acdd5c90a","Measuring Passenger Travel Time Reliability Using Smart Card Data","Bagherian, M. (University of Queensland); Cats, O. (TU Delft Transport and Planning); van Oort, N. (TU Delft Transport and Planning); Hickman, M (University of Queensland)","","2016","Service reliability is a key performance measure for transit agencies in increasing their service quality and thus ridership. Conventional reliability metrics are established based on vehicle movements and thus do not adequately reflect passenger’s experience. In the past few years, the growing availability of smart card data allows shifting the reliability measures from vehicle’s to passenger’s point of view.
This research introduces two new passenger-oriented measures of transit travel time reliability and a method to measure them using on-board smart card transactions data. These measures reflect both punctuality (deviation from the schedule) and predictability (day to day variation) of the service over the selected spatial-temporal scale. The analysis approach and the mathematical formulation are presented and then applied to the public transport network of The Hague, the Netherlands. The developed method can evaluate passenger-oriented reliability at various spatial-temporal levels, from a single origin-destination pair to a network-wide evaluation.","","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:ed380182-a8d9-4780-a4db-78f2d63f974d","http://resolver.tudelft.nl/uuid:ed380182-a8d9-4780-a4db-78f2d63f974d","Craft and Industry","van Wijk, C.A. (TU Delft OLD History of Architecture & Urban Planning)","","2016","","inaugural speech; decorative art; Delft; teaching collection","en","abstract","","","","","","International Planning History Society Proceedings. History Urbanism Resilience, Volume 7: Planning Theories, Pedagogies and Practices","","","","","OLD History of Architecture & Urban Planning","","",""
"uuid:1924c757-34c2-4f46-9930-6727c6381615","http://resolver.tudelft.nl/uuid:1924c757-34c2-4f46-9930-6727c6381615","No more multiple removal: Construct Primaries then Migrate","Meles, G.A. (University of Edinburgh); Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics); Curt, A (University of Edinburgh)","","2016","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:28ababd6-a8bb-46b8-8145-699d1b07106b","http://resolver.tudelft.nl/uuid:28ababd6-a8bb-46b8-8145-699d1b07106b","Imaging the earth's interior with virtual sources and receivers","Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics); van der Neut, J.R. (TU Delft Applied Geophysics and Petrophysics); Thorbecke, J.W. (TU Delft Applied Geophysics and Petrophysics); Slob, E.C. (TU Delft Applied Geophysics and Petrophysics); Snieder, R (External organisation)","","2016","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:b1aba6ba-e474-4b62-8e68-ec85b8e543b9","http://resolver.tudelft.nl/uuid:b1aba6ba-e474-4b62-8e68-ec85b8e543b9","A new horizon: Using heat to measure distance in high performance metrology solutions","Bijster, R.J.F. (TU Delft Computational Design and Mechanics); Sadeghian Marnani, H. (TNO); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2016","","","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:bcd02397-1787-4823-9873-28ab3dbbfd90","http://resolver.tudelft.nl/uuid:bcd02397-1787-4823-9873-28ab3dbbfd90","Towards an effective reduction of intensity noise in laser diodes","Bijster, R.J.F. (TU Delft Computational Design and Mechanics); Sadeghian Marnani, H. (TNO); van Keulen, A. (TU Delft Computational Design and Mechanics)","","2016","","","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:a477a164-d648-4046-9bfa-57723be9ced4","http://resolver.tudelft.nl/uuid:a477a164-d648-4046-9bfa-57723be9ced4","Meta-instrument: An opto-mechanical platform for imaging near-field optical instruments","Bijster, R.J.F. (TU Delft Computational Design and Mechanics); Klop, W (TNO); Hagen, R. (TNO); Sadeghian Marnani, H. (TNO)","","2016","","","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:c74b17ea-d39e-4536-b218-62227a4a97e7","http://resolver.tudelft.nl/uuid:c74b17ea-d39e-4536-b218-62227a4a97e7","Improved surface-wave response from ambient noise in Malargüe, Argentina, using seismic interferometry by multidimensional deconvolution","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Ruigrok, E.N. (Royal Netherlands Meteorological Institute (KNMI)); Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics); Gomez, M. (Comision Nacional de Energia Atomica)","","2016","Generating new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventially, the new responses are retrieved by simple crosscorrelation of recordings made by separate receivers: a first receiver acts as `virtual source' whose response is retrieved at the other receivers. The newly retrieved responses can be used to extract receiver-receiver phase velocities, which often serve as input parameter for tomographic inverse problems, or which can be linked to temporally varying parameters such as hydrocarbon production and precipitation. For all applications, however, the accuracy of the retrieved responses is of great importance. In practice, this accuracy is often degraded by irregularities in the illumination pattern: correct response retrieval relies on a uniform illumination of the receivers. Reformulating the theory underlying seismic interferometry by crosscorrelation as a multidimensional deconvolution (MDD) process, allows for correction of these non-uniform illumination patterns by means of a so-called point-spread function (PSF). We apply SI by MDD to surface-wave data recorded by the Malargüe seismic array in western Argentina. The aperture of the array is approximately 60 km and it is located on a plateau just east of the Andean mountain range. The array has a T-shape: the receivers along one of the two lines act as virtual sources whose responses are retrieved by the receivers along the other (perpendicular) line of receivers. Because SI by MDD relies on one-way wavefields, we select time windows dominated by surface-wave noise traveling in a favorable direction, that is, traversing the line of virtual sources before arriving at the receivers at which we aim to reconstruct the virtual-source responses. These time windows are selected through a frequency-dependent slowness analysis along the two receiver lines. From the selected time windows, virtual-source responses are retrieved by computation of ensemble-averaged crosscorrelations. Similarly, ensemble-averaged crosscorrelations between virtual sources are computed: the point-spread function. We use the PSF to deconvolve the effect of illumination irregularities and the source function from the virtual-source responses. The combined effect of time-window selection and MDD results in more accurate surface-wave responses.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:3a61299a-0086-48be-ba01-03e7687e7557","http://resolver.tudelft.nl/uuid:3a61299a-0086-48be-ba01-03e7687e7557","Housing Wealth and Aged Care: Issues and Options","Haffner, M.E.A. (TU Delft OLD Housing Systems); Ong, R (Curtin University); Wood, G.A. (Royal Melbourne Institute of Technology University)","","2016","","","en","abstract","","","","","","","","","","","OLD Housing Systems","","",""
"uuid:7a854430-3051-4074-9baf-583e16a779f2","http://resolver.tudelft.nl/uuid:7a854430-3051-4074-9baf-583e16a779f2","Housing Wealth and Aged Care: Policies Compared","Haffner, M.E.A. (TU Delft OLD Housing Systems); Ong, R (Curtin University); Wood, G.A. (Royal Melbourne Institute of Technology University)","","2016","","","en","abstract","","","","","","","","","","","OLD Housing Systems","","",""
"uuid:2fc5e5c0-1ccc-4148-8497-017ce1a58714","http://resolver.tudelft.nl/uuid:2fc5e5c0-1ccc-4148-8497-017ce1a58714","A passive heat tracer experiment to determine the seasonal variation in residence times in a managed aquifer recharge system with DTS","des Tombe, B.F. (TU Delft Water Resources); Bakker, M. (TU Delft Water Resources); Schaars, F (Artesia); van der Made, KJ (Wiertsema & Partners); Calje, R (Artesia); Borst, L. (PWN Drinking Water Supply Company)","","2016","Targeted provisional session N°8.01 The seasonal variation in residence times is determined in a managed aquifer recharge system using a passive heat tracer test. The managed aquifer recharge system consists of a sequence of alternating elongated recharge basins and rows of recovery wells. The temperature of both the water in the recharge basin and the surface influence the temperature in the aquifer. The flow field changes when the temperature changes, as the hydraulic conductivity is a function of the temperature. Fiber optic cables were inserted up to a depth of 20 meters with direct push equipment to measure vertical temperature profiles with DTS. In this fashion, the fiber optic cables are in direct contact with the aquifer and the disturbance of the aquifer is minimal. The measured spatial and temporal temperature variations in the subsurface were modeled with SEAWAT, a coupled flow and heat transport model. MODPATH was used to compute flow paths and residence times. During the winter, a larger fraction of the water moves through the warmer lower part of the aquifer, thereby increasing the residence time. The opposite happens during the summer, when most of the water moves through the warmer upper part of the aquifer, resulting in shorter residence times.","Groundwater; DTS","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:0869c60a-b09b-4ca7-a6eb-2b0294fab9e9","http://resolver.tudelft.nl/uuid:0869c60a-b09b-4ca7-a6eb-2b0294fab9e9","Simulation of an Automated Public Transportation System","Winter, M.K.E. (TU Delft Transport and Planning)","","2016","Simulation of a new mobility service for urban and regional public transportation operated by automated vehicles • The simulation tool determines for a certain demand the required fleet size and the overall driven kilometers while constraining the maximum passenger waiting time • The simulation output allows to estimate the operational and passenger costs and consequently to determine the optimum fleet size for obtaining minimum overall costs","","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:8af03a1d-142d-4d72-b2f9-443cb4395aed","http://resolver.tudelft.nl/uuid:8af03a1d-142d-4d72-b2f9-443cb4395aed","A Network Model for the Kinetics of Bioclogged Flow Diversion for Enhanced Oil Recovery","Lopez Pena, L.A. (TU Delft Numerical Analysis); Meulenbroek, B.J. (TU Delft Mathematical Physics); Vermolen, F.J. (TU Delft Numerical Analysis)","","2016","After the primary extraction in oil reservoirs up to 60 % of the oil remains trapped in the reservoir (Sen, 2008). Therefore, different mechanisms have been developed to get the oil out to the reservoir. One of these techniques is Microbial Enhanced Oil Recovery (MEOR) which is a technique used to produce more oil in a secondary extraction by using microbes in the reservoir. The main effects caused by microbes in oil recovery is the reduction of the interfacial tension between oil and water, wettability change of the rock and bioclogging caused by the growth and development of biofilm. Among these mechanisms, interfacial tension reduction and biclogging is thought to have the greatest impact on recovery (Sen, 2008). In this work, we describe the growth of biofilm, the growth of the microbial population and the transport of nutrients using a pore network model. We follow the previous models of Thullner et al. (Thullner, 2008) and Ezeuko et al. (Ezeuko, 2011) in which the biofilm is considered as a permeable layer. We consider the biofilm and the bacteria separately. Additionally, we assume that once a tube is full with biofilm, this biofilm can spread to the neighboring tubes. Finally, we study the changes in the hydrodynamic properties of the medium caused by the plugging of the pores and we study the flow diversion of water caused by plugging of the high permeability zones.
Without hydrological intervention, the waterquality in the area would suffer significantly from the brackish seepage. To prevent this, each year about 140 million cubic meter of water from the lake Markermeer, which equals a column of 20 cm, is let in at the river Vecht. This water is used to dilute the brackish water and flush it as soon as possible to the bigger parts of the watersystem like the Amsterdam-Rijncanal. However, this supply of a huge volume of water from the Markermeer is the reason that the water quality objectives, as set in the European Water Framework Directive, are not met in the area around the northern part of the river Vecht. Ecologically, this area needs local, fresh seepage from the hills of the Utrechtse Heuvelrug and not the foreign water from the Markermeer, which contains a lot of sulphate. Furthermore, the available amount of fresh water in the Markermeer is expected to become less due to the predicted climate change and the involved waterboards have agreed to reduce the intake from the Markermeer.
Waternet is the merged organisation of:
1) the Waterboard Amstel, Gooi and Vecht,
2) the Surface Water and Sewerage Management of the City of Amsterdam,
3) the Amsterdam Water Supply.
Because Waternet, as a governmental organisation, covers the complete watercycle, innova-tive solutions for the classic problems with brackish seepage can be thought of...
Currently Waternet works on the following research questions: Can the brackish ground-water be extracted by wells, to prevent the brackish seepage to reach the surface water sys-tem of the deep polder? Does this save fresh water from the Markermeer? Can this brackish groundwater be used as a new source for the drinking water supply for the city of Amster-dam? And if so, how can the concentrate be disposed that is created with the purification of the brackish groundwater by the process of reverse osmosis? What are the benefits, the costs and the risks of such a system?
We would like to present a concise but colorful introduction of the current system with the brackish seepage from the polder Horstermeer, and the ideas for using it as a new source for drinking water.
Contact Information: Frank Smits, Waternet, Production Plant Leiduin, Vogelenzangseweg 21, 2114 BA, Vogelenzang, the Netherlands, Mobile Phone: +31 6 532 714 39, Phone: +31 20 608 7546, Email: frank.smits@waternet.nl
A field experiment was designed to study the effectiveness of minimal interventions (short message and pictogram on poster) to increase pre-swim shower behaviour in a holiday park swimming pool. To find the best approach, signs were designed based on different ways of information processing in the human brain (psychology and communication). This study observed the pre-swim shower behaviour of over 1500 bathers during 10 different settings, including 1 baseline, 2 different informative interventions, 2 different normative interventions, two different interventions based on facilitating equipment, and 3 combinations of the most effective (informative + normative, informative + facilities end normative + facilities). The results clearly indicate that the normative approach had the strongest positive effect on pre-swim shower behaviour, with 50% more pre-swim showers taken compared to the baseline condition. Also, improvement of facilities was found to be effective in changing pre-swim shower rates, which also goes for combinations of multiple methods. The variables age, carrying belongings and parental guidance of children and teenagers also appeared to influence pre-swim shower behaviour. Outcomes of the study can be implemented in practice directly.","","en","abstract","","","","","","","","","","","Sanitary Engineering","","",""
"uuid:18c00fa8-8ae6-4dc0-8f0c-66869f950a4f","http://resolver.tudelft.nl/uuid:18c00fa8-8ae6-4dc0-8f0c-66869f950a4f","Measuring the added value in Corporate Real Estate alignment by using the Preference-based Accommodation Strategy design procedure","Arkesteijn, M.H. (TU Delft Real Estate Management); Binnekamp, R. (TU Delft Real Estate Management); de Jonge, H. (TU Delft Real Estate Management)","","2016","One of the long-standing issues in the field of corporate real estate corporate strategy. Extensive research into existing approaches brought valuable insights into steps, components and variables that are needed in the alignment process. Despite that, it is not clear if existing approaches had much uptake in practice and they fall short in a number of aspects. In most models little to no attention is given to the design and selection of the alternative portfolio that adds most value to the organisation. Furthermore, university campus managers have indicated that they need better information and tools to support campus decision making.
The Preference-based Accommodation Strategy design (PAS) procedure is a tool to enhance CRE decision making and has been developed to remove these gaps. In the PAS design procedure decision makers define criteria and iteratively test and adjust these criteria by designing new real estate portfolios. The portfolio design that adds most value to the organisation, i.e. has the highest overall preference is suggested as the portfolio that optimally aligns real estate to corporate strategy. The PAS procedure is iteratively repeated with the participants in a series of interviews and workshops. Two pilot studies have been performed at the Delft University of Technology (DUT). The study into the portfolio of lecture halls showed that stakeholders were able to use the procedure successfully. This paper reports the pilot study for their portfolio of food facilities. The objective of this research is to test if participants are able to perform the PAS procedure. Therefore a mathematical model of the group decision making process is designed and tested.
This pilot study also reveals that the participants by completing the steps in the PAS procedure are able to express their preferences accordingly. They designed an alternative portfolio with a higher overall preference score than their current real estate portfolio. In addition, the design method is evaluated positively. The positive results suggest that designing a strategy by using the PAS procedure is a suitable approach to alignment. The PAS design procedure enables CRE managers to determine the added value of a real estate strategy. Because the PAS design method is generic in nature it can be used for a wide range of real estate portfolios.","Corporate real estate management; decision-making; alignment; decision support system; preference measurement","en","abstract","","","","","","","","","","","Real Estate Management","","",""
"uuid:54a5ebac-1416-49fa-a78c-e9e767b951b7","http://resolver.tudelft.nl/uuid:54a5ebac-1416-49fa-a78c-e9e767b951b7","Sediments and Subgrid: A Great Combination","Volp, N.D. (TU Delft Environmental Fluid Mechanics); van Prooijen, Bram (TU Delft Environmental Fluid Mechanics); Pietrzak, J.D. (TU Delft Environmental Fluid Mechanics); Stelling, G.S. (TU Delft Environmental Fluid Mechanics)","","2016","Long term morphodynamic simulations are used for predicting the impact of climate change and human interventions in our estuarine and coastal regions. The accuracy of this type of simulations suffers generally from low resolution grids. Eventhough high resolution bathymetry data is increasingly more available thanks to new measurement techniques. However, the computational effort for such high resolution simulations is high. Even with increasing computer power and by using the various available techniques for speeding up simulations [Roelvink (2006) ], the computational effort remains high. By introducing a subgrid based method for morphodynamics, we aim at increasing the
accuracy of coarse grid based morphodynamic simulations, without significantly increasing the computational effort. Over the last years, we have gained experience in hydrodynamic modelling using subgrid based methods [i.e. Defina
(2003), Casulli (2009), Volp et al (2013) ]. These methods combine coarse computational grids with high resolution information. In Volp et al (2013 ) we presented a subgrid based, two-dimensional, depth averaged hydrodynamic model, that is inspired by the method presented by Casulli (2009 ). The model makes use of two grids: a (coarse) computational grid and a high resolution subgrid, see Figure 1. The system of equations is solved at the coarse grid, but high resolution information is taken into account. The water level is assumed to be uniform within a computational cell, but the bed and the roughness are allowed to vary within a cell. Therefore, high resolution effects can be taken into account for the computation of cross-sectional areas, cell volumes, advection and friction. This also implies that cells can be wet, partly wet or dry. The solution based on a coarse computational grid improved significantly, when high resolution effects are taken into account. This result is obtained without a significant increase in computational cost.
Coastal flood risk reduction by creating and restoring ecosystems is increasingly seen as a promising supplement to conventional coastal engineering methods. Salt marshes, mangrove forests and reed fields can act as a vegetated foreshore in front of a coastal dike. In such a combined dike-foreshore system, the foreshore plays a role in attenuating storm waves, whereas the dike retains the surge and the remaining wave energy. The current study focuses on the process of wave attenuation by vegetation and, vice versa, the process of breakage of vegetation due to wave action.","salt marsh; vegetation; wave attenuation; estuaries","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:783456a8-77ba-4dd6-91ff-6a1862cc71e7","http://resolver.tudelft.nl/uuid:783456a8-77ba-4dd6-91ff-6a1862cc71e7","Physical Processes Driving the Morphological Evolution of the Roggenplaat Tidal Flat","de Vet, P.L.M. (TU Delft Environmental Fluid Mechanics); van Prooijen, Bram (TU Delft Environmental Fluid Mechanics); Schrijvershof, R. (Deltares); van der Werf, JJ (Deltares); Schrijver, MC (Deltares); Wang, Zhengbing (TU Delft Coastal Engineering)","","2016","The flow velocities in tidal channels are already rather complex by the presence of various tidal components, wind driven flow and estuarine circulations. An extra level of complexity is introduced when the flow on top of an intertidal
flat is considered (Le Hir, 2000). This research aims at understanding the complex flow patterns on top of a large-scale intertidal flat and on assessing the morphological consequences. The focus of this study is on the Roggenplaat, which is with an intertidal area of 14.6 km2 the largest intertidal flat
fully surrounded by channels of the Eastern Scheldt (The Netherlands, see Figure 1). The flat is subject to a mean tidal range of 2.6 m and is characterized by a typical sediment grain size of 0.25 mm. Two large tidal creeks in the Northwest
are the remainder of the merging of separate flats 80-150 years ago. Since the late 1980s, the flats in the Eastern Scheldt have been eroding severely because of the construction of a storm surge barrier and various compartment dams (Louters, 1998). A nourishment of 1.65 million m3 is planned on this flat for 2017, to compensate for its lowering. This study combines the results of an Acoustic Doppler Current Profiler (ADCP) measurement campaign with the results of a numerical model. Apart from validation material for the numerical model, the ADCP data is also analysed individually. The focus of this study is on the present-day hydrodynamics and morphodynamics of the Roggenplaat, which is essential knowledge for the design of appropriate nourishment strategies. Furthermore, physical insights achieved in this study are relevant for the understanding of other large-scale intertidal flats around the world.","intertidal flat; Eastern Scheldt; field measurements; numerical modelling","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:8a5eb35f-8d44-4267-9193-4275bdab429d","http://resolver.tudelft.nl/uuid:8a5eb35f-8d44-4267-9193-4275bdab429d","Hydrodynamics in the mid-field plume region of the Rhine ROFI","Rijnsburger, S. (TU Delft Environmental Fluid Mechanics); Audibert, R.F. (University of Washington); Souza, Alejandro J. (National Oceanography Center); Horner-Devine, Alexander R. (University of Washington); Pietrzak, J.D. (TU Delft Environmental Fluid Mechanics)","","2016","River plumes, also regions of freshwater influence , are important features to understand because of their impact on the current structure, stratification and the transport of fine sediments, nutrients and contaminants. One important river plume is the Rhine ROFI. Prior studies have sought to understand far-field dynamics where cross-shore straining is dominant (Simpson & Souza, 1995; Souza & Simpson,1995; De Boer et al., 2008). However, less is known about the mid-field region of this river plume, where fronts matter as well. Here we use field observations from a 6 week measurement campaign in fall 2014 to investigate the dynamics of the mid-field region of het Rhine ROFI. We will focus on the interaction between far-field processes, such as tidal straining, and near field processes, such as fronts. The Rhine ROFI is of interest because the Dutch coast has been modified by extending the Port of Rotterdam and the construction of the Sand Engine that extends into the southern North Sea. These perturbations might impact the currents, the ROFI and the distribution of fine sediment, nutrients and contaminants. Therefore, the understanding of this is of importance. During September and October 2014, a large field observational campaign was conducted off the Dutch coast close to the sand Engine, 10 km north of the river outflow. Measurements were made at two locations, 2 and 5.5 km offshore (see Figure 1). Moorings, with Conductivity Temperature Depth (CTD) and Optical Backscatter (OBS) instruments at different depths, were deployed to obtain vertical profiles of salinity and suspended sediment concentrations (SSC). In addition, at each location a bottom-mounted Acoustic Doppler Current Profiler (ADCP) measured vertical velocity profiles. Radar images of the area were used to gain surface information, specifically about frontal propagation in the vicinity of the measurement locations. The weather conditions were highly variable during the six week period. There were very calm periods, but also storms, which completely destroyed stratification. The wind direction changed during the campaign as well. In addition to the data, numerical modelling with a 3D hydrostatic model will be used to gain information of the entire mid-field plume.","river plume; in-situ measurements; cross-shore straining; numerical modelling; frontal dynamics","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:52f6b686-dcf9-42f9-8199-c424de0ee794","http://resolver.tudelft.nl/uuid:52f6b686-dcf9-42f9-8199-c424de0ee794","A semi-analytical study on the residual transport of salinity and sediment trapping in well-mixed estuaries","Wei, X. (TU Delft Mathematical Physics); Kumar, M. (TU Delft Mathematical Physics); Schuttelaars, H.M. (TU Delft Mathematical Physics)","","2016","Along-channel and cross-channel sediment transport in tidal estuaries is usually driven by tides, density gradients, Coriolis’s force, wind stress, channel curvature and bathymetric variations. Since the water motion is influenced by density-induced gravitational circulation which in turn affects the salinity distribution, the coupled water motion and salinity has a potentially strong effect on the residual sediment transport, and thus the trapping of fine sediment. To better understand the dynamical effects of water motion and salinity on sediment transport, the salinity field has to be computed consistently. In this work, the water density is assumed to be a function of salinity only, thus ignoring the influence of temperature and assuming the sediment concentration to be low. To obtain the coupled water motion and salinity, the three-dimensional shallow water equations and the salinity equation are solved simultaneously using a perturbation method together with an iterative finite element method (Kumar et al., 2016; Wei et al, in preparation), resulting in a consistent water motion and salinity field. This information is then used to calculate the sediment concentrations, so that the influence of the salt dynamics on sediment transport is prognostically calculated. Owing to the adopted perturbation method, the contribution of various physical processes to residual sediment transport can be studied separately, which allows for a full investigation on individual contribution of each process to longitudinal/lateral transport of salinity and sediment. Moreover, as wind is another important forcing of estuarine circulation (Chen et al., 2009, de Jonge and van Beusekom 1995, Ridderinkhof et al., 2000), the influence of wind stress on estuarine sediment transport will be studied. The present work will bring insights into sediment transport and trapping mechanisms in real estuaries, for example, the Delaware estuary.","lateral circulation; residual transport; sediment; baroclinic forcing; estuaries","en","abstract","","","","","","","","","","","Mathematical Physics","","",""
"uuid:0d7b0f33-2b38-4d20-bed7-7048b2cc2427","http://resolver.tudelft.nl/uuid:0d7b0f33-2b38-4d20-bed7-7048b2cc2427","Net sediment transport by tidal asymmetry in the hyper-turbid Ems River","Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics); Vroom, J. (Deltares); Wang, Zhengbing (TU Delft Coastal Engineering); Krebs, Martin (EMS Waterway Administration)","","2016","","tidal asymmetry; hyper-turbidity; Ems River","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:117aedc3-6c93-4b24-b577-9151b79f4c11","http://resolver.tudelft.nl/uuid:117aedc3-6c93-4b24-b577-9151b79f4c11","EEG as an imaging tool: which inverse method can successfully disentangle sources in proximity?","Kalogianni, K. (TU Delft Biomechatronics & Human-Machine Control); de Munck, Jan C. (Amsterdam UMC); Nolte, Guido (University Medical Center Hamburg-Eppendorf); Vardy, A.N. (TU Delft Biomechatronics & Human-Machine Control); Schouten, A.C. (TU Delft Biomechatronics & Human-Machine Control); van der Helm, F.C.T. (TU Delft Biomechatronics & Human-Machine Control); Daffertshofer, Andreas (Vrije Universiteit Amsterdam)","","2016","The accuracy of EEG source localization depends on the choice of the inverse method, the resolution of the forward model, and the signal to noise ratio (SNR) of the recordings. Since we are interested in disentangling sources in proximity, the goal of our study is to examine the sensitivity of spatial resolution of EEG source reconstruction to a wide variety of factors like reconstruction method, SNR, orientation, inter-dipole distance and depth of the simulated dipoles, etc.
We simulated time series to resemble waveforms of somatosensory evoked potentials. Inter-dipole distances and different dipole orientations were investigated as well as the effect of (realistic) noise. We employed both spherical and realistic head models. Source reconstruction was realized using a conventional stationary dipole model, MUSIC, self-consistent MUSIC (SC-MUSIC) algorithm, and e-LORETA. In addition to the above mentioned methods, a new approach is tested building upon the e-LORETA solution: the topography of the maximum of the e-LORETA distribution is projected out of the data before calculating the next e-LORETA inverse solution in a iterative process. The quality of fit (or localization) was defined as the distance between the simulated point- sources and either the estimated point-sources or the activity distributions by means of the Euclidean distance or of the Earth Mover’’s Distance, respectively. As expected, inter-dipole distances played an important role in the ability of every method to disentangle the simulated sources. Overall, SC-MUSIC appeared best suited for disentangling the two simulated sources even at high-noise simulations.","","en","abstract","","","","","","","","","","","Biomechatronics & Human-Machine Control","","",""
"uuid:d448f934-48ed-43e6-ba28-4818b75e1287","http://resolver.tudelft.nl/uuid:d448f934-48ed-43e6-ba28-4818b75e1287","Highly automated platooning: Effects on mental workload, stress, and fatigue","Heikoop, D.D. (TU Delft Transport and Planning; University of Southampton); de Winter, J.C.F. (TU Delft Biomechatronics & Human-Machine Control); van Arem, B. (TU Delft Transport and Planning); Stanton, Neville A. (University of Southampton)","","2016","Automatically driving platoons of vehicles are a likely candidate for solving many existing issues of road safety and congestion. However, the psychological effects of such technology are yet to be understood. Therefore, by means of a driving simulator experiment, we aimed to assess the psychological effects of driving in a highly automated platoon. The results showed that the type of task had no substantial effect on heart rate and self-reported stress, fatigue, and workload. However, time-on-task substantially reduced participants’ heart rate.
Overall aim and key objectives Advances in optical imaging techniques over the past decades have revolutionized our ability to study chemically reactive flows encountered in air-breathing combustion systems. Emerging technology for unravelling clean- and efficient heat release is needed for advancing new reduced emission technology, and is on the central agenda for a wide variety of energy production- and transport industry. Combustion of fossil fuels remains our largest source of energy production in the world, and global concerns regarding energy security, environmental pollution, and anthropogenic climate change have motivated a large body of research devoted to the experimental measurement and numerical simulation of combustion systems. Clean combustion engineering is the search for improved efficiency by means of strengthen the systems fuel-economy and lowering the emission of NOx, particulates, CO and unburned hydrocarbons (incomplete combustion). New reduced emission technology, greatly rely upon the ability to control the heat release and the exhaust produced by the exothermic reactions between the fuel and the oxidizer in the chemically reactive flow. For the engineering system design, it exist a significant need to inform on the flame-physics involved based on direct observation of the combustion reaction progress and interaction, which is a demanding task for any measurement technique. Chemically reactive flows are inherently multiscale, fully characterized in three-dimensional space and evolving on rapid time-scales. The combustion environment imposes a significant challenge for diagnostics, where it needs to be collected complete information ideally with correlated-field multi-parameter measurement capabilities, exhibiting high spatial and temporal resolution and provided within a snap-shot to freeze the fast dynamics involved. Concurrent detection of major- and minor molecular species (multiplexing) and determining the three most important scalars; the temperature, the flow-field, and the mixture fraction, is vitally important in studies of the reactive flow. The temperature marks the evolution of heat release and energy transfer, while species concentration gradients provide critical information on mixing and chemical reaction. Optical imaging techniques have the advantage of being non-invasive, which means that the studied process is not significantly perturbed by the measurement technique, and allowing for the acquisition of statistics in-situ. Spectroscopy offer intrinsic chemical specificity, in that different classes of molecules have specific spectral signatures serving as unique fingerprints for their identification. Laser-based diagnostics may in general provide measurements with exceptionally high spatial- and temporal resolution, which is important in producing reliable and accurate experimental data. Coherent anti-Stokes Raman spectroscopy (CARS) is one such versatile technique, which has had a profound impact on a wide variety of fields. It was pioneered in composition- and temperature measurements almost 40 years ago, and is referred to as authoritative with the level of accuracy and precision it may provide. A limitation still, has been its main applicability as a single point-measurement technique, where the experimenter needs to raster-scan the measurement samples assembling the spatial image. Because many complex systems can be fully characterized in multidimensional space, there is a large motivation for the advancement of multidimensional CARS imaging techniques.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:d3216f46-be46-4ef3-a446-0f96aea5d7e9","http://resolver.tudelft.nl/uuid:d3216f46-be46-4ef3-a446-0f96aea5d7e9","Validation of standard and extended Eddy Dissipation Concept Model for the Delft Jet-in Hot Coflow (DJHC) flame","Bao, H.; Huang, X. (TU Delft Fluid Mechanics); Roekaerts, D.J.E.M. (TU Delft Fluid Mechanics)","","2016","style=""margin: 0cm 0cm 10pt;"">The Delft Jet-in Hot Coflow (DJHC) burner is used to investigate flameless combustion by imitating the recirculation flow characteristics appearing in a real complex furnace via a hot diluted coflow[1]. A welldefined stream of high temperature, low oxygen concentration combustion products is injected around the fuel jet as oxidizer in order to obtain ‘Moderate and Intense Low-oxygen Dilution (MILD)’ combustion conditions. For a range of jet and coflow conditions detailed experiments were made [2] and also several numerical validation studies, see e.g. [4,5]. The Eddy Dissipation Concept (EDC) model for turbulence chemistry interaction modeling has been widely used for modeling MILD combustion. EDC is providing a closure for the mean chemical source term based on a proposed microstructure of the reacting flow following from energy cascade concepts. It assumes that chemical reactions can only happen in the smallest eddies, whose size are of the same order of magnitude as the Kolmogorov scales, the so-called fine structures. Thus, the fraction of fine structure 훾훾∗ and mean residence time 휏휏∗ (the reciprocal of it denotes the mass exchange between reactants inside fine structure and the surrounding) are necessary for EDC simulation. They are related to turbulent kinetic energy 푘푘 and eddy dissipation rate 휀휀 (which are calculated from turbulent models) via two constants 퐶퐶퐷퐷1 and 퐶퐶퐷퐷2 . It has been confirmed that 휀휀 = 2퐶퐶퐷퐷1푢푢∗3/퐿퐿∗ = 4퐶퐶퐷퐷2푢푢∗2/3퐿퐿∗2.","","en","abstract","","","","","","","","","","","Fluid Mechanics","","",""
"uuid:29a0701e-b692-4d52-83de-1b8a4d07a18b","http://resolver.tudelft.nl/uuid:29a0701e-b692-4d52-83de-1b8a4d07a18b","Effect of dilution in an inter-turbine Flameless combustor","Augusto Viviani Perpignan, A.A.V. (TU Delft Flight Performance and Propulsion); Gangoli Rao, A. (TU Delft Flight Performance and Propulsion)","","2016","style=""margin: 0cm 0cm 10pt;"">Alternatives to combustion in aircraft engines are not expected to become feasible in the decades to come. As the aviation traffic increases and regulations become more stringent, reduction in pollutant emissions are needed. The Flameless Combustion (FC) regime has been one of the promising candidates to achieve lower emissions in gas turbine engines. This combustion regime is characterized by welldistributed reactions, with low peak temperatures, resulting in lower emissions and acoustic oscillations. However, the attainment of the FC regime is not straight forward considering the conditions and requirements of gas turbines. Most of the previous combustor design attempts failed to provide broad operational range, high combustion efficiency, or were difficult to integrate in an engine. Along with a novel aircraft concept, the European project AHEAD (Advanced Hybrid Engines for Aircraft Development) resulted in the conceptual design of a gas turbine engine with two sequential combustion chambers1. As the aircraft concept allows the use of cryogenic fuels, the first combustion chamber was designed to operate with hydrogen or natural gas. The second is the inter-turbine combustor herein studied, which would operate under the FC regime burning conventional fuels.","","en","abstract","","","","","","","","","","","Flight Performance and Propulsion","","",""
"uuid:e9127977-27f5-46d2-8f12-732a789ae796","http://resolver.tudelft.nl/uuid:e9127977-27f5-46d2-8f12-732a789ae796","Biomass gasification in a novel 50kWth indirectly heated bubbling fluidized bed steam reformer","Del Grosso, M. (TU Delft Large Scale Energy Storage); de Jong, W. (TU Delft Large Scale Energy Storage)","","2016","style=""margin: 0cm 0cm 10pt;"">In the global chase towards sustainability and cleaner ways of generating power, the utilization of biomass for clean energy conversion process has become increasingly interesting as biomass is potentially a CO2-neutral energy source. Among the processes known to produce power, gasification represents an attractive and versatile technology to convert wide variety of biomass into product gas mainly composed by CO, H2, CO2, H2O and CH4, that can be used for (combined) heat and power (CHP) production, transportation fuels and chemicals. For small to medium scale biomass gasification, fluidized bed technology is attractive: the process takes place in a bed of small particles fluidised by a suitable gasification medium and the very good gas-solid mixing ensures temperature uniformity through the bed and leads to an excellent mass and heat transfer. In indirectly heated gasification, also known as second generation or allothermal gasification, the heat needed for the desired reactions is provided by ex-situ oxidation reactions and this leads to a higher quality product.","","en","abstract","","","","","","","","","","","Large Scale Energy Storage","","",""
"uuid:94f228dc-5aa9-4048-8589-86f4bade8aed","http://resolver.tudelft.nl/uuid:94f228dc-5aa9-4048-8589-86f4bade8aed","Comparative study of RANS-EDC, LES-CSE and LES-FGM simulations of Delft jet-in-hot-coflow (DJHC) natural gas flames","Roekaerts, D.J.E.M. (TU Delft Fluid Mechanics; Eindhoven University of Technology); Bao, H.; Huang, X. (TU Delft Fluid Mechanics); Vasavan, A. (Eindhoven University of Technology); van Oijen, J.A. (Eindhoven University of Technology); Labahn, J. (University of Waterloo); Devaud, C. (University of Waterloo)","","2016","style=""margin: 0cm 0cm 10pt;"">We report on a comparative study of model predictions of jet-in-hot-coflow flames. TheDelft Jet-in-Hot- Coflow (DJHC) burner was built to mimic the important characteristics of flameless combustion without the complications of a real furnace [1,2]. The DJHC burner has been used to create a turbulent diffusion flame of Dutch Natural Gas in a coflowing oxidizer stream of high temperature with low oxygen concentration. The experimental database contains the results of high speed chemiluminescence imaging, velocity statistics from LDA measurementsand temperature statistics from CARS measurements. In recent years several computational studies have been made using the DJHC burner as validation database [3-9]. It has been shown before that predictions are sensitive to the coflow radial profiles of temperature and oxygen concentration, to there presentation of effects of entrained air, and to turbulence-chemistry interaction and this is also the focus of the present study","","en","abstract","","","","","","","","","","","Fluid Mechanics","","",""
"uuid:d34d8f9f-5afe-45f9-a175-5e5f2899c087","http://resolver.tudelft.nl/uuid:d34d8f9f-5afe-45f9-a175-5e5f2899c087","Sites and services in performance: Housing in Addis Ababa beyond crisis and heroism","Mota, Nelson (TU Delft OLD Woningbouw)","","2016","","","en","abstract","","","","","","","","","","","OLD Woningbouw","","",""
"uuid:2f336a60-f369-456e-ad83-6169a280fa4d","http://resolver.tudelft.nl/uuid:2f336a60-f369-456e-ad83-6169a280fa4d","The Influence of the Indoor Air Quality of the Microclimate Box on the Material Degradation of Historic Objects","Groves, R.M. (TU Delft Structural Integrity & Composites)","","2016","br/>The paper gives an assessment of the Indoor Air Quality (IAQ) within a microclimate box and its influence on the material degradation. IAQ is concerned with maintaining acceptable temperature, humidity and oxygen levels and low pollutant levels in the rooms, cabinets or other enclosed spaces, for humans to live and work, while meeting legal guidelines. In the microclimate box it is concerned with maintaining an acceptable environment for the conservation of historic objects.
As a reference we should first consider the composition of outside air. This is contains approximately 78% nitrogen, 21% oxygen and 1% argon, and varying amounts of water vapour depending on local climate. Further it contains smaller quantities carbon dioxide, sulphur dioxide, nitrous oxides and small particles depending on local pollution levels. Temperature varies by season, time of day and location. Historically records have been kept of some of these parameters of more than 100 years as part of weather monitoring and prediction. The indoor climate in a room in a house, office or museum is modified by the building construction, heating and cooling, and by occupants and objects within the building. An unheated building is buffered from the outdoor climate by the insulation effect of the building itself, but may contain localised microclimates due to airflow (draughts) and solar radiation through the windows. Heating and cooling may be passive, by natural convection and conduction, or active airflow of heated or cooled air. Occupants and objects within the building interact with the Indoor Air Quality, for example breathing in oxygen and expelling carbon dioxide, or outgassing of volatile materials, such as paints.
An IAQ engineer has a range of instruments to monitor the indoor climate. Temperature and relative humidity (RH) can be measured using electronic sensors and if necessary logged at regular intervals over a longer period. Airflows from a heating and ventilation air conditioning (HVAC) system can be measured with an anemometer. Several anemometer types exist and they can measure air velocity and if the aperture size is known, air volume per hour. Air volume per hour allows the calculation of room air changes per hour, which is related to the dilution of pollutants in the air by the HVAC system. Examples of pollutants which can be measured include carbon monoxide (CO), carbon dioxide (CO2) and particulates e.g. PM10s, bacteria, moulds and yeasts. Gaseous particulates, such as CO and CO2 follow an exponential dilution curve due to the air changes and particulates follow a greater that exponential dilution curve as settling of particles also plays a role.
In a sealed microclimate, these air changes are not present, so the buffering effect is enhanced, but the active dilution of pollutants is not present. Published studies have focussed mostly on the buffering effect, while some recent studies, for example at the Metropolitan Museum of Art, measure the gaseous pollutants present. Further there is a lot of information in the literature about the influence of pollutants in outside air causing an enhanced rate of material degradation on historic buildings. This study will bring together these sources of information to assess how the air within microclimate boxes could cause an enhanced rate of chemical degradation of historic objects.
Experimental description: Results from two laboratory experiments will be presented. In both experiments, a two-layer sample consisting of a top layer of epoxy, representing the impervious cap rock, and a lower layer of Bentheimer sandstone (porosity ~ 22%, permeability 1.34 Darcy, density 2080 kg/m3), representing the reservoir rock, is used. In the first experiment, ultrasonic tests using piezoelectric transducers were performed under ambient (room) conditions of temperature and pressure, and water was displaced by ethanol. In the second experiment, elaborate ultrasonic experiments were carried out under controlled (elevated) pressure and temperature conditions mimicking a true CO2 reservoir where supercritical CO2 displaced brine. An array of seismic receiver was used to record the ultrasonic reflections from the top and the bottom of the porous layer.
Results and conclusions: Using non-physical (or ghost) reflections retrieved by seismic interferometry, we could successfully estimate the acoustic wave velocity in the porous reservoir and its temporal change associated with changes in pressure and fluid-content in the pores. The estimation of layer-specific wave-velocity, eliminating effectively the effect of the changes occurring in the overburden and that of source irreproducibility, has been possible for the first time. The advantage of using cross-coherence over cross-correlation in the application of seismic interferometry, in order to address velocity changes in a thin reservoir layer, has been established. It was possible to obtain reliable values of the rock-physical properties from the estimated layer-specific acoustic wave velocity obtained by the proposed approach.","ultrasonics; interferometry; monitoring; CO2; CCS; reflections; seismics","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:c1362afb-ddd5-49ef-8563-f3fcf737532f","http://resolver.tudelft.nl/uuid:c1362afb-ddd5-49ef-8563-f3fcf737532f","Application of seismic interferometry by multidimensional deconvolution to ambient seismic noise recorded in Malargüe, Argentina","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Ruigrok, E.N. (Universiteit Utrecht); Hunziker, J.W. (Swiss Federal Institute of Technology); gomez, Martin (CNEA); Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics)","","2016","Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, these seismic interferometric responses are retrieved by simple crosscorrelation of recordings made
by separate receivers: a first receiver acts as a 'virtual source' whose response is retrieved at the other receivers. When surface waves are retrieved, the newly retrieved responses can be used to extract receiver-receiver phase velocities. These phase velocities often serve as input parameters for tomographic inverse problems. Another application of SI exploits the temporal stability of the multiply scattered arrivals (the coda). For all applications, however, the accuracy of the retrieved responses is paramount. In practice, this accuracy is often degraded by irregularities in the illumination pattern: correct response retrieval relies on a uniform illumination of the receivers. Reformulating the theory underlying seismic interferometry by crosscorrelation as a multidimensional deconvolution (MDD) process, allows for correction of these non-uniform illumination patterns by means of a so-called point-spread function (PSF). We apply SI by MDD to surface-wave data recorded by the Malargüe seismic array in western Argentina. The aperture of the array is approximately 60 km and it is located on a plateau just east of the Andean mountain range. The array has a T-shape, which makes it very well suited for the application of SI by MDD. We select time windows dominated by surface-wave noise traveling in a favorable direction, that is, traversing the line of virtual sources before arriving at the receivers at which we aim to retrieve the virtual-source responses. These time windows are selected based upon the slownesses along the two receiver lines. From the selected time windows, virtual-source responses are retrieved by computation of ensemble-averaged crosscorrelations. Similarly, ensemble-averaged crosscorrelations between the positions of the virtual sources are computed: the PSF. We use the PSF to deconvolve the effect of illumination irregularities and the source function from the virtual-source responses retrieved by crosscorrelation. The combined effect of time-window selection and MDD results in more accurate and temporally stable surface-wave responses.","","en","abstract","","","","","","","Campus only","","","","Applied Geophysics and Petrophysics","","",""
"uuid:0b3576d1-c3b0-441d-bdcf-7ee83440d324","http://resolver.tudelft.nl/uuid:0b3576d1-c3b0-441d-bdcf-7ee83440d324","Seismic interferometry using ghost reflections applied to laboratory measurements for monitoring supercritical CO2 sequestration","Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Ghose, R. (TU Delft Applied Geophysics and Petrophysics); Kirichek, Alex (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Heller, H.K.J. (TU Delft Lab Geoscience and Engineering)","","2016","The seismic method with active sources has proven to be a very valuable tool for CO2 sequestration monitoring. The seismic method can be used for extraction of reservoir quantities like saturation and pore pressure. But nonrepeatability in the positioning of the source and receiver during base and monitoring surveys can deteriorate the accuracy of the estimated changes in the reservoir parameters. Application of seismic interferometry (SI) to reflection recordings on permanent networks of seismic stations could help eliminate the monitoring errors due to the nonrepeatability errors. Retrieving virtual sources at the positions of the stations eliminates the non-repeatability in the source positioning. SI is traditionally applied using crosscorrelation. We show results from application of SI to ultrasonic data of sequestration of supercritical CO2. The data are recorded on a two-layer sample consisting of epoxy (caprock) and Bentheimer sandstone (reservoir). We apply SI by crosscoherence, which has the potential to retrieve results with higher temporal resolution than SI by crosscorrelation. Our aim is to monitor layer-specific changes inside the reservoir during the displacement of brine by supercritical CO2 and during the displacement of supercritical CO2 by brine. To achieve layer-specific monitoring, we retrieve with SI non-physical reflections from the bottom of the sandstone as if source and receiver were placed at the top of the sandstone. The velocities we estimate from the non-physical reflections during injection of brine aiming to displace supercritical CO2 and during injection of supercritical CO2 aiming to displace brine indicate rather similar saturation for both injection cases. We confirm the latter by transmission measurements, but with lower resolution.","","en","abstract","","","","","","","Campus only","","","","Applied Geophysics and Petrophysics","","",""
"uuid:ce922060-117a-4a9a-b160-66987ddc3077","http://resolver.tudelft.nl/uuid:ce922060-117a-4a9a-b160-66987ddc3077","Dutch Estates Landscapes: Method for describing the spatial essence","Verschuure, G.A (TU Delft Landscape Architecture)","","2016","","estate; estates landscape; urban landscape; city; resilience; abolishment of preservation of landscape laws","en","abstract","","","","","","International Planning History Society Proceedings - History Urbanism Resilience, Vol. 4: Planning and Heritage","","","","","Landscape Architecture","","",""
"uuid:794c1a1a-e775-4d3a-a269-d067721c98b6","http://resolver.tudelft.nl/uuid:794c1a1a-e775-4d3a-a269-d067721c98b6","Isolation, appropriation and reintegration: Formal meets informal at the historic Westfort Leprosy Hospital","Clarke, Nicholas (TU Delft Teachers of Practice; University of Pretoria)","","2016","","","en","abstract","","","","","","International Planning History Society Proceedings - History Urbanism Resilience, Vol. 4: Planning and Heritage","","","","","Teachers of Practice","","",""
"uuid:af1d6ab1-cf1e-4739-a440-4271ab9b4a89","http://resolver.tudelft.nl/uuid:af1d6ab1-cf1e-4739-a440-4271ab9b4a89","Bazaar and the Interiorization of the territory","Sanaan Bensi, N. (TU Delft OLD Public Buiding)","","2016","","","en","abstract","","","","","","The publication process is proceeding. The estimated publication date is in May 2017. Because of copyright issues I only upload the abstract of the article here.","","","","","OLD Public Buiding","","",""
"uuid:2037f5c8-5195-42da-b543-48d5ce624cf8","http://resolver.tudelft.nl/uuid:2037f5c8-5195-42da-b543-48d5ce624cf8","Smart tools on campus: a literature study connecting real estate management objectives and positioning technologies","Valks, B. (TU Delft CRE Strategic Portfolio Management); Arkesteijn, M.H. (TU Delft Real Estate Management); den Heijer, A.C. (TU Delft Real Estate Management)","","2016","One of the long-standing issues in the field of corporate real estate management is the alignment of an organisation’s real estate to its corporate strategy. Despite extensive research, existing approaches have not had much uptake in practice and fall short in a number of aspects (H 2011). The hypothesis in this paper is that indoor positioning technology enables us to accurately observe users and measure their behaviour real-time, which improves alignment in two ways: firstly, by improving the current match between supply and demand by giving end users access to this information to help them find vacant work places or their colleagues, and secondly by improving decision-making for the future match by delivering more accurate insight into space use. Reports suggest that significant improvements in space utilization are possible. In the UK, the average utilization for educational space is 27% (SMG 2006); the report suggests that an improvement of 3% (from 27% to 30%) can lead to 10% savings in costs and m2.
The objective of this paper is to provide a framework in which existing research in indoor positioning is positioned in relation to the objectives in CREM. To the best of the authors’ knowledge such an overview does not exist. In the studied papers on positioning techniques the added value for real estate management is just briefly touched upon. Concepts such as better supporting user activities or reducing energy costs are shortly described as potential benefits of the technologies demonstrated in the papers, and almost never are these benefits quantified.
In the literature five measurement objectives can be distinguished: measuring frequency, occupancy, location, movement and behaviour. Measuring frequency is the simplest, after which each subsequent objective becomes more complex. The first findings suggest a clear relationship between these measurement objectives and (1) the measurement method, such as Wi-Fi or Occupancy sensors and (2) the objectives in real estate management, such as supporting user activities and reducing m2 footprint.
The framework presented in the paper provides a useful tool for both practitioners and researchers. For researchers, REM objectives that are not or only slightly touch upon provide a starting point for future research and applications. For practitioners, the framework provides useful information that can help them match their organisation’s objectives and priorities to the prevalent measurement methods.
a Waste Water Treatment Plant (WWTP) that receives sewage from
multiple mixed sewer systems is presented, together with a first rough
solution algorithm. A simplification followed by a naive translation into
a zero-one linear programming problem results in 1152 inequalities for
480 binary variables.","Water Management; Branch and Bound","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:fcde91f3-bb2c-4781-815a-dba4d5b5fe5b","http://resolver.tudelft.nl/uuid:fcde91f3-bb2c-4781-815a-dba4d5b5fe5b","The properties of negation and zero in ringoids as defined by Kulisch","van Nooijen, R.R.P. (TU Delft Water Resources); Kolechkina, A.G. (TU Delft Water Resources)","","2016","In [1,2] Kulisch defines (ordered) ringoids and vectoids to provide a theoretical basis for computer arithmetic and interval arithmetic. One interesting aspect of his treatment is the search for necessary and sufficient conditions for a meaningful notion of negation and zero. In this paper we consider this both from the point of view of functions on the underlying set and from a category theoretical standpoint. It turns out that the conditions provided by Kulisch can be restated in other forms, but that the original form is probably both necessary and sufficient for the intended purpose.","ringoid; computer arithmetic; algebra","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:9323be3d-f473-4615-868c-7c8493741a43","http://resolver.tudelft.nl/uuid:9323be3d-f473-4615-868c-7c8493741a43","Experimental characterisation of Lamb wave propagation through thermoplastic composite ultrasonic welds","Ochôa, Pedro (TU Delft Structural Integrity & Composites); Villegas, I.F. (TU Delft Structural Integrity & Composites); Groves, R.M. (TU Delft Structural Integrity & Composites); Benedictus, R. (TU Delft Aerospace Structures & Materials)","","2016","Ultrasonic welding is a very promising technique for joining thermoplastic composite (TpC) components in aircraft primary structures [1, 2]. The potential introduction of new lightweight structures in civil aviation has been driving the change towards condition-based maintenance (CBM) as an alternative to the regular inspection interval approach [3]. In turn, CBM has been pushing forward the development of structural health monitoring (SHM) technology capable of reliably assessing the structural integrity of a component during flight or at pre-flight checks. Among all of them, Lamb wave techniques are widely recognised as some of the most promising approaches for SHM of composite structures [4].
Accurate quantitative damage assessment can only be performed if ultrasonic response changes can be unambiguously correlated to specific damages. That correlation requires the distinction of benign features from damaging ones. Therefore, before designing an SHM system for any component it is first necessary to understand the influence of several intrinsic characteristics of the undamaged joints on Lamb wave propagation. In the case of TpC ultrasonically welded (UW) joints, the cross-section is characterised by a very thin (~ 0.05 mm) polymeric weld-line between the laminated adherends, and a region within the two laminate layers adjacent to the weld-line which is affected by partial fusion of the matrix during the welding process [1, 2]. Although this heat-affected zone does not have a separation surface as the weld-line, it is expected to have different elastic properties to the rest of laminate.
Despite several computational and experimental investigations about Lamb-wave-based SHM of different types of composite structures, the interaction of Lamb waves with the unique properties of TpCUW joints has not been addressed yet. This paper presents the first experimental study about the influence of weld quality and adherend edge tapering on the propagation of Lamb waves through TpCUW single-lap joints. The main aim of this research is to understand how the guided wave interactions with the internal structure of TpC ultrasonic welds influence the scattering at a single-lap geometry. The conclusions can later be used to develop a model which will assist the design of a Lamb-wave-based SHM system for a TpC structure. The results from this study are also expected to provide some reverse-engineering insight on different weld qualities, ultimately contributing to the improvement of the manufacturing process of TpCUW joints.","","en","abstract","","","","","","","","","","Aerospace Structures & Materials","Structural Integrity & Composites","","",""
"uuid:7d835437-fa8f-4a84-ab62-161448b7c5e7","http://resolver.tudelft.nl/uuid:7d835437-fa8f-4a84-ab62-161448b7c5e7","Perspectives on Structural Health Monitoring of Composite Civil Aircraft","Groves, R.M. (TU Delft Structural Integrity & Composites)","","2016","Safe and cost effective operation are the highest priorities for civil aircraft. Considering that many events that can occur during normal aircraft operation which cause a reduction in the residual strength of the structure, a rigid adherence to inspection and maintenance schedules and timely repair of damage is required. Since Structural Health Monitoring (SHM) has the capability to investigate critical areas of the aircraft structure, it is potentially applicable to a wide range of current civil aircraft, including general aviation, business jets and large passenger aircraft. Although SHM could be extended to the complete aircraft structure in the future, in the shorter term it is more practical to consider the most critical structural elements/assemblies, both for reasons of cost and the time, especially in certification, leading to more standardised procedures in future. On a technical level SHM should be addressed by identifying critical structural elements/assemblies such as: blade stiffened skin panels, sandwich panels, hat stiffened skin panels, multi-rib and multi-spar structures, welded , mechanically-fastened and co-cured joints. For each of these, expected failure modes are assessed and used to determine the expected damage types. Damage sizes which post a risk to the structural integrity of the aircraft are then matched with SHM technologies which have suitable damage detection capability. This paper proposes the use of metrics to quantify the effectiveness and efficiency of the SHM system according to the six most important elements of SHM: Damage event detection, Damage event localization, Damage type detection, Damage extent detection, Damage effect estimation, and Damage prognosis. SHM Technologies are a combination of non-destructive testing techniques, developed further for in-situ monitoring, and new technologies. The techniques considered to have the most potential for SHM of composite aircraft are Acoustic emission, Guided Lamb wave sensing and Fibre optic sensing. SHM comprises part of the Smart Materials and Structures Concept that will be the basis for future Smart and Efficient Aircraft with lightweight structures, on-board monitoring, health diagnosis and adaptive structures. In this concept, optimal sensor positioning, distributed communication networks and algorithms, miniaturisation and energy harvesting are also considered.","","en","abstract","","","","","","","","","","","Structural Integrity & Composites","","",""
"uuid:217651c0-007b-4b40-8c2d-c53cbf1549fd","http://resolver.tudelft.nl/uuid:217651c0-007b-4b40-8c2d-c53cbf1549fd","Computational Challenges of Next Generation Sequencing Pipelines Using Heterogeneous Systems","Houtgast, E.J. (TU Delft Computer Engineering; Bluebee, Rijswijk); Sima, V.M. (Bluebee, Rijswijk); Bertels, K.L.M. (TU Delft Quantum & Computer Engineering; TU Delft FTQC/Bertels Lab); Al-Ars, Z. (TU Delft Computer Engineering)","","2016","We are rapidly entering the era of genomics. The dramatic cost reduction of DNA sequencing due to the introduction of Next Generation Sequencing (NGS) techniques has resulted in an exponential growth of genetics data. The amount of data generated, and its associated processing into useful information, poses serious computational challenges. Here, we give a brief introduction of NGS, show a typical NGS processing pipeline, and show the associated challenges from a computational perspective. A case study is presented where one component of the NGS processing pipeline is accelerated: BWA-MEM, the de-facto industry-standard for the mapping stage. This is a first step in achieving a fully heterogeneously accelerated NGS pipeline.","BWA-MEM; FPGA; GPU; Next Generation Sequencing","en","abstract","","","","","","","","","","Quantum & Computer Engineering","Computer Engineering","","",""
"uuid:a7bb04b7-c3f7-4e57-a772-c43a4f78ed2d","http://resolver.tudelft.nl/uuid:a7bb04b7-c3f7-4e57-a772-c43a4f78ed2d","Time-lapse seismic imaging of the Reykjanes geothermal reservoir","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Obermann, Anne; Blanck, Hanna; Verdel, Arie; Paap, B; Guðnason, Egill Árni; Hersir, Gylfi Páll; Jousset, Philippe; Sigurðsson, Ömar","","2016","We report on the results obtained from a dense seismic deployment over a geothermal reservoir. The reservoir has been producing continuously for almost a decade and is located on the tip of the Reykjanes peninsula, SW Iceland. The seismic stations on top of the reservoir have continuously recorded the ambient seismic wavefield between April 2014 and September 2015. The density of the seismic network makes the data well suited for time-lapse seismic imaging of the reservoir. To that end we compute time-lapse responses through the application of seismic interferometry. These interferometric lapse responses are obtained by simple crosscorrelation of the seismic noise recorded by the different seismic stations. We subsequently evaluate the temporal variation of the coda of these crosscorrelations. The term coda refers to the later arriving, multiple scattered waves. The multiple scattering implies that these waves have sampled the subsurface very densely and hence become highly sensitive to tiny mechanical and structural changes in that subsurface. This sensitivity allows one, in principle at least, to monitor the geothermal reservoir. Preliminary results indeed suggest a relation between the temporal variation of the coda waves and the reservoir. Ultimately, this method may lead to a means to monitor a geothermal reservoir in both space and time.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:0d7e29d3-66e1-47f3-808a-45b295631c4e","http://resolver.tudelft.nl/uuid:0d7e29d3-66e1-47f3-808a-45b295631c4e","Time-lapse seismic imaging of the Reykjanes geothermal reservoir","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Obermann, Anne; Verdel, Arie; Paap, B; Blanck, Hanna; Guðnason, Egill Árni; Hersir, Gylfi Páll; Jousset, Philippe; Sigurðsson, Ömar","","2016","We report on the results obtained from a dense seismic deployment over a geothermal reservoir located on the tip of the Reykjanes peninsula, SW Iceland. The available seismic stations have continuously recorded the ambient-seismic wave field between April 2014 and August 2015. Using seismic interferometry (SI), seismic responses were generated between these receivers. SI allows one to turn one receiver of a receiver pair into a so-called ‘virtual source’, whose response is then retrieved by the other receiver. The retrieved virtual-source response approximates the medium’s Green’s function between the two receiver locations. For the ambientseismic recordings used in this study, virtual-source retrieval involves simple time-averaging of the crosscorrelations between these recordings. The virtual-source responses were retrieved in a time-lapse manner. The temporal variation of the ‘coda’ of these virtual-source responses has been evaluated, where the term coda refers to the later arriving, multiply scattered waves. The multiple scattering implies that these waves have sampled the subsurface very densely and hence have become highly sensitive to tiny mechanical and structural changes in that subsurface. We did not find a clear relation between the temporal variation of the coda waves and the injection/ extraction rates of the geothermal reservoir.","","en","abstract","","","","","","","Campus only","","","","Applied Geophysics and Petrophysics","","",""
"uuid:e4bbbf0e-f348-4706-b68e-3e4b1e714820","http://resolver.tudelft.nl/uuid:e4bbbf0e-f348-4706-b68e-3e4b1e714820","A Symmetric Interior Penalty Discontinuous Galerkin Method with Local Time Stepping for Anisotropic Elasticity Problems","Geevers, Sjoerd (University of Twente); van der Vegt, Jaap (University of Twente); Mulder, W.A. (TU Delft Applied Geophysics and Petrophysics; Shell Global Solutions International B.V.)","","2016","We present and analyse a Symmetric Interior Penalty Discontinuous Galerkin (SIPDG) method combined with an explicit hybrid Local Time Stepping (LTS) scheme for solving seismic wave problems in heterogeneous anisotropic elastic media. The discontinuous Galerkin method allows for local adjustment of the mesh size and approximation order, and can deal with unstructured non-conforming meshes of mixed types. Furthermore, when using orthogonal basis functions and an explicit time integration scheme, the method becomes fully explicit and inherently parallel, making it an attractive method for seismic applications involving large three-dimensional domains, sharp material contrasts, and detailed internal structures.","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:f8bfa554-ca39-4980-88b4-3ed6cb40d490","http://resolver.tudelft.nl/uuid:f8bfa554-ca39-4980-88b4-3ed6cb40d490","The Markerwadden: the influence of the sand fraction on the ripening behaviour of Markermeer sediment","Barciela Rial, M. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares); van Paassen, L.A. (TU Delft Geo-engineering); Griffioen, Jasper (Universiteit Utrecht; TNO); van Kessel, Thijs (Deltares)","","2016","","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:7fca8c80-7009-46ea-9cce-ff9b0490a064","http://resolver.tudelft.nl/uuid:7fca8c80-7009-46ea-9cce-ff9b0490a064","Long-term biogeomorphological behavior of coupled bare intertidal flats and vegetated foreshores","Willemsen, P.W.J.M (University of Twente); Borsje, B.W. (University of Twente; Deltares); Vuik, V. (HKV Consultants); Janssen, S.K.H. (TU Delft Policy Analysis; Deltares); Bouma, T. J. (NIOZ Royal Netherlands Institute for Sea Research); Hulscher, SJMH (University of Twente)","","2016","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:61c1b6d8-7e7c-4f6d-8dbd-8604d14a573e","http://resolver.tudelft.nl/uuid:61c1b6d8-7e7c-4f6d-8dbd-8604d14a573e","Experimental and numerical study of MILD combustion in a lab-scale furnace","Huang, X. (TU Delft Fluid Mechanics); Tummers, M.J. (TU Delft Fluid Mechanics); Roekaerts, D.J.E.M. (TU Delft Fluid Mechanics)","","2016","Mild combustion in a lab-scale furnace has been experimentally and numerically studied. The furnace was operated with Dutch natural gas (DNG) at 10 kW and at an equivalence ratio of 0.8. OH∗chemiluminescence images were taken to characterize the reaction zone. The chemiluminescence intensity is relatively low compared to conventional flames and relatively uniformly distributed in the reaction zone due to the dilution effects of recirculated burnt gases. Visible flames were not observed. To characterize the dilution effects of burnt gases on reactions, flamelets generated with diluted fuel and diluted air, instead of flamelets based on pure fuel and air, were applied in an extended Flamelet Generated Manifold (FGM) approach. Burnt gases at stoichiometric mixture fraction rather than those at global equivalence ratio were considered as diluent, which is more appropriate for furnaces operating at lean condition. The numerical simulations were performed using the open source CFD package-OpenFOAM.","flameless; furnace; MILD; NOx; OpenFOAM; turbulent combustion","en","abstract","","","","","","","","","","","Fluid Mechanics","","",""
"uuid:29bd2a04-aa0b-482b-abec-906ea8bbc8f0","http://resolver.tudelft.nl/uuid:29bd2a04-aa0b-482b-abec-906ea8bbc8f0","Design and preliminary evaluation of a bio-inspired steerable needle","Scali, M. (TU Delft Medical Instruments & Bio-Inspired Technology); Pusch, T.P.; Breedveld, P. (TU Delft Medical Instruments & Bio-Inspired Technology); Dodou, D. (TU Delft Medical Instruments & Bio-Inspired Technology)","","2016","","","en","abstract","","","","","","Abstract 07.03 - Session Medical Robotics","","","","","Medical Instruments & Bio-Inspired Technology","","",""
"uuid:78530c20-e714-4f25-aec2-44923e465978","http://resolver.tudelft.nl/uuid:78530c20-e714-4f25-aec2-44923e465978","Designing homes with meanings: Construction of a tool based on human values","Overtoom, M.E. (TU Delft Environmental Technology and Design); Hekkert, P.P.M. (TU Delft Design Aesthetics)","","2015","Houses were among the first structures that were built, and remain the most common type of building today. The design of housing has been the subject of architecture, while from a psychological point of view the meaning of home has been a major subject of research. These two different viewpoints are combined in this research to provide a tool for designers to design based on values. First a quantitative study was carried out to match activities and spaces in the home to human values (Schwartz, 2000). This resulted in a design-tool that consists of the ten values (hedonism, self-direction, universalism, benevolence, conformity, tradition, power, and achievement) associated activities and spaces, and hierarchical graphs based on space syntax. Lastly opposing spatial features were laid over the two dimensions (openness to change vs. conservation and self-transcendence vs. self-enhancement). Subsequently this tool was used to design seven houses, which were used to find out whether the values designed in the houses were also recognised as such. Houses with values preferred by the interviewees, were chosen more often than values on the other end of the circle, indicating that the tool is of some help when certain meanings need to be communicated by design.","home design; values","en","abstract","","","","","","","Campus only","","","","Environmental Technology and Design","","",""
"uuid:aa6dfd00-3e8d-4bc4-9e1d-fbb25cbe7f09","http://resolver.tudelft.nl/uuid:aa6dfd00-3e8d-4bc4-9e1d-fbb25cbe7f09","Properties of the steel-mortar interface derived by impedance spectroscopy in different environment and curing conditions","Chen, Zhipei (TU Delft Materials and Environment); Koleva, D.A. (TU Delft Materials and Environment); van Breugel, K. (TU Delft Materials and Environment)","","2015","In practice, reinforced concrete structures may encounter different kinds of curing conditions
due to the weather (sun radiation, air moisture and wind), nearby external environment
(seawater, attack of stray current arising from nearby railways), or human factors (insufficient
curing period). In some extreme conditions, the corrosion of embedded steel will occur at early
age, and the pore structure of cementitious material matrix can also be influenced. One of the
significant consequences is the premature failure of steel- matrix interface, which plays
important role for the integrity of a structure during the subsequent service life. This
phenomenon leads frequently to early deterioration and eventually to risky situations for the
stability of structures. In any case, the economic costs inherent to reparation works are
considerable.
Therefore, the state and properties of the steel/cement-based material interface is to
be monitored from early ages, especially under extreme operating conditions. As one of the
nondestructive testing methods, electrochemical impedance spectroscopy (EIS) can be
employed to account for properties at the steel/cement paste interface. EIS measurements are
very useful since they provide the possibility of correlating the dielectric properties and the
microstructure of a cementitious material (derived from the high frequency region), with the
corrosion behavior of the embedded steel (derived from the low frequency region).
In this work, to simulate different curing conditions, standard curing for 28d and “on-air” curing
after 24h were employed. Different groups of reinforced mortar specimens of the same mixture
were designed according to the existence or coexistence of chloride, stray current, and anodic
polarization. The steel-mortar interface properties with age and under different curing conditions
was monitored by EIS measurement. The paper presents the evolution of the fitting parameters,
corresponding to the cementitious material matrix, embedded steel and interaction between
them are explained and compared in terms of different curing conditions. This research is
expected to clarify that the, curing conditions in unusual work environment (as for example stray
current conditions) must be taken into account regarding the behavior of steel-matrix interface at
early age, and some curing methods must be put into practice in order to obtain satisfactory
performance of the reinforced structure before the structure is used at full operational capacity.","steel-mortar interface; curing conditions; impedance spectroscopy","en","abstract","","","","","","","","","","","Materials and Environment","","",""
"uuid:0fd487ad-e0e4-41fb-b45f-4da5767955b4","http://resolver.tudelft.nl/uuid:0fd487ad-e0e4-41fb-b45f-4da5767955b4","Around the world with professor Vening Meinesz onboard the submarine K-XVIII","Root, B.C. (TU Delft Astrodynamics & Space Missions); Hanssen, R.F. (TU Delft Mathematical Geodesy and Positioning); Vermeersen, L.L.A. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions; NIOZ Royal Netherlands Institute for Sea Research); Munnik, M.E. (TU Delft Library Education Services); Vlijm, Rozemarijn (Universiteit Leiden)","","2015","In November 1934, Den Helder, The Netherlands, the start of a remarkable voyage commenced. The Hr. Ms.K-XVIII, a Dutch submarine, was about to set sail to Soerabaya, Indonesia. Onboard was a Dutch professor, Felix Andries Vening Meinesz. He was able to measure the Earth’s gravity field with similar precision as on land for the first time in history using his innovative pendulum apparatus. His ground breaking data and systematic way of working changed the way of performing scientific expeditions.","","en","abstract","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:4d4e0341-4b33-4337-ba78-8263a8f66119","http://resolver.tudelft.nl/uuid:4d4e0341-4b33-4337-ba78-8263a8f66119","Towards Seismoelectric Inversion: Sensitivity Analysis using Resolution Functions","Grobbe, N. (TU Delft Applied Geophysics and Petrophysics); Maas, P. (Student TU Delft); Slob, E.C. (TU Delft Applied Geophysics and Petrophysics); Mulder, W.A. (Shell Global Solutions International B.V.)","","2015","","Seismoelectric; electromagnetic; resolution function; sensitivity analysis","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:6d3efb71-d583-4a26-8ae9-c7febc3eef73","http://resolver.tudelft.nl/uuid:6d3efb71-d583-4a26-8ae9-c7febc3eef73","Overhang angle control and optimal part orientation in topology optimization for additive manufacturing","van de Ven, Emiel (Student TU Delft); Driessen, Anton (Student TU Delft); van Keulen, A. (TU Delft Computational Design and Mechanics); Langelaar, Matthijs (TU Delft Computational Design and Mechanics)","","2015","","Topology Optimization; Additive Manufacturing; Overhang constraints; Part orientation","en","abstract","","","","","","","","","","","Computational Design and Mechanics","","",""
"uuid:cf76860c-3959-498c-bd6b-809b943e16e8","http://resolver.tudelft.nl/uuid:cf76860c-3959-498c-bd6b-809b943e16e8","Planning ATES systems under uncertainty","Jaxa-Rozen, M. (TU Delft Old - TPM-MAS-BA Beleidsanalyse); Kwakkel, J.H. (TU Delft Old - TPM-MAS-BA Beleidsanalyse); Bloemendal, Martin (TU Delft Water Resources)","","2015","","","en","abstract","","","","","","","","","","","Old - TPM-MAS-BA Beleidsanalyse","","",""
"uuid:66eb5bb6-07c0-4d7b-8ea2-dec0c329a43d","http://resolver.tudelft.nl/uuid:66eb5bb6-07c0-4d7b-8ea2-dec0c329a43d","Towards smart grid user engagement through social networking","Huang, Yilin (TU Delft System Engineering); Scepanovic, S (External organisation); Miorandi, D (External organisation); Warnier, Martijn (TU Delft Multi Actor Systems); Brazier, F.M. (TU Delft System Engineering)","","2015","","","en","abstract","","","","","","","","","","Multi Actor Systems","System Engineering","","",""
"uuid:44fa954c-bd0a-46ad-83e7-45d39eaf1e00","http://resolver.tudelft.nl/uuid:44fa954c-bd0a-46ad-83e7-45d39eaf1e00","Parsifal the game: A journey into the uncharted territory of theatre and games","Kortmann, Rens (TU Delft Policy Analysis); Luijten, A (Independent researcher); Brommer, Cecile (Independent researcher)","","2015","Theatrical art and games can mutually benefit each other. In a recent project we explored this proposition. On the one hand, we added game elements to a classical opera performance. The resulting ‘Parsifal the game’ was performed six times for altogether over 400 spectators/players. On the other hand, we investigated how user experiences in simulation games could benefit from an artistic space in which they are played.
We studied how our production encouraged its plaudience (a conflation of the words players and audience) to experience and reflect upon themes such as compassion, sustainable societies, competition, and collaboration. From our work we derived lessons about how our blend of theatre and games may evolve into a new genre of interactive storytelling. Mainly, we learned that the performance had transformed from a space for passively digesting a story into a gameful event for active co-creation of embodied experiences and meaning. Artistic concepts and game-elements strengthened each other to create an immersive environment to experience challenges and pitfalls, but also to collaboratively design new futures. We aim to continue our journey and develop a framework for scientific and artistic research to further this new genre.
In our talk we will discuss our expectations when we started our journey, the obstacles and rapids we encountered on our way, the resulting opera-game, and performances. Finally, we discuss future possibilities, challenges and pitfalls in developing this genre.","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:13043885-19e2-44dc-adef-2155db774832","http://resolver.tudelft.nl/uuid:13043885-19e2-44dc-adef-2155db774832","Weshareit: A Nexus Approach To Nile Basin Water Resources Management","Onencan, A.M. (TU Delft Policy Analysis); Enserink, B. (TU Delft Policy Analysis); Kortmann, Rens (TU Delft Policy Analysis); Thissen, W.A.H. (TU Delft Policy Analysis)","","2015","","River Basin Management; Uncertainty; Decision Support; Serious Gaming; Tradeoff Analysis; Nexus Approach","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:fc61e01c-169f-48f9-afe2-71a134de84ba","http://resolver.tudelft.nl/uuid:fc61e01c-169f-48f9-afe2-71a134de84ba","Exploring social sensing techniques for measuring rainfall and flood response in urban environments","Koole, W. (TU Delft Sanitary Engineering); ten Veldhuis, Marie-claire (TU Delft Sanitary Engineering); Sips, RHJ (IBM Benelux)","","2015","","","en","abstract","","","","","","","","","","","Sanitary Engineering","","",""
"uuid:8c30999e-5987-4092-8d69-446a2d9c2616","http://resolver.tudelft.nl/uuid:8c30999e-5987-4092-8d69-446a2d9c2616","The Resilience Value of Public Transport Development Plans","Cats, O. (TU Delft Transport and Planning)","","2015","Investments in transport are increasingly motivated by the need to improve its resilience – the overall capability to maintain system integrity and functionality. Nonetheless, there is lack of knowledge on how to assess their impact on network resilience. This study investigates the resilience of alternative public transport networks by assessing the consequences of link failures on network performance. A full-scan disruption impact analysis is performed and its implications on travel times and network integrity are analyzed for a public transport expansion plan in Stockholm, Sweden. The results demonstrate that the extended network is considerably more resilient in terms of average performance deterioration as well as worst case scenario. Moreover, the critical links in each network are identified and impact disparity is investigated. The analysis method presented in this study can support the consideration of development plans impacts on network resilience in the planning process.","Resilience; Public Transport; Link Failure; Network Design; Disruption","en","abstract","","","","","","","","","","","Transport and Planning","","",""
"uuid:f27d76b1-ee08-4b28-964e-6bd10a58e462","http://resolver.tudelft.nl/uuid:f27d76b1-ee08-4b28-964e-6bd10a58e462","A new free floating satellite dynamics testbed for hardware-in-the-loop docking experiments","Smisek, J. (TU Delft Control & Simulation; European Space Agency (ESA)); Schiele, A. (TU Delft Biomechatronics & Human-Machine Control; European Space Agency (ESA))","","2015","","","en","abstract","","","","","","","","","","","Control & Simulation","","",""
"uuid:440b8263-4a77-432d-916b-052f6e80004b","http://resolver.tudelft.nl/uuid:440b8263-4a77-432d-916b-052f6e80004b","A Mixed Discretization Scheme for CO2 Leakage Mechanisms","Al-Khoury, Rafid (TU Delft Applied Mechanics); Musivand Arzanfudi, M. (TU Delft Applied Mechanics)","","2015","A computational model for multiple CO2 leakage mechanisms is introduced. Leakage through cap layers and abandoned wellbores are considered. For the first, leakage in a rigid heterogeneous layered medium constituting layers of different physical properties is simulated. Such a leakage exhibits a
discontinuity in the saturation field at the interface between layers. For the second, a one-dimensional compressible two-fluid domain, representing a homogeneous air gas and a multiphase CO2 with a jump at the interface between them, is modelled using the drift-flux model. All important physical
phenomena and processes occurring along the wellbore path, including fluid dynamics, buoyancy, phase change, compressibility, thermal interaction, wall friction, and slip between phases, together with the jump in density and enthalpy between air and CO2, are considered. For both mechanisms, the governing field equations are derived based on the averaging theory and solved numerically using a mixed finite element discretization scheme. This scheme entails solving different balance equations using different discretization techniques, which are tailored to accurately simulate the physical behaviour of the primary state variables. For the cap layer leakage mechanism, the standard Galerkin finite element method is utilized to discretize the water phase pressure field, and a stationary partition of unity finite element method is utilized to discretize the non-wetting phase saturation field. The boundary between layers is embedded
within the finite elements, alleviating the need to use the typical interface elements, and allowing for the use of structured, geometry-independent and relatively coarse meshes. For the wellbore leakage mechanism, the standard Galerkin FEM is utilized to model the diffusive field, and the moving
partition of unity method, together with the level-set method, are utilized to model the advective terms. The numerical results show that this discretization scheme provides an accurate and effectively mesh-independent solution. Due to the significant difference in the time scale between wellbore and
reservoir model, a multi-time-step scheme is proposed. A coupling approach is developed to make the connection between the reservoir and wellbore models. The proposed computational method allows the use of structured, relatively coarse and geometry- and mesh-independent finite element meshes.","","en","abstract","","","","","","","","","","","Applied Mechanics","","",""
"uuid:94557689-f579-40a9-8f43-c2cb89df01e6","http://resolver.tudelft.nl/uuid:94557689-f579-40a9-8f43-c2cb89df01e6","Tunable polaritons from plasmon-phonon coupling in hyperbolic media","Dai, S. (University of California); Ma, Q. (Massachusetts Institute of Technology); Zhu, S. (TU Delft Micro and Nano Engineering); Liu, Mengkun (University of California); Andersen, T. (Massachusetts Institute of Technology); Fei, Z. (University of California); Goldflam, M.D. (University of California); Wagner, M. (University of California); Watanabe, Kenji (National Institute for Materials Science); Taniguchi, T. (National Institute for Materials Science); Thiemens, M. (University of California); Keilmann, F. (Ludwig Maximilians University); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); Jarillo-Herrero, P. (Massachusetts Institute of Technology); Fogler, M. (University of California); Basov, D.N. (University of California)","","2015","","","en","abstract","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:9cdae4f5-8ba8-4d5e-8f2a-32702b4b75f8","http://resolver.tudelft.nl/uuid:9cdae4f5-8ba8-4d5e-8f2a-32702b4b75f8","Improved surface-wave response from ambient noise in Malargüe, Argentina, using seismic interferometry by multidimensional deconvolution","Weemstra, C. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Ruigrok, E.N. (Universiteit Utrecht)","","2015","","","en","abstract","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:6dd0b768-ba84-4768-8b63-d711172a9565","http://resolver.tudelft.nl/uuid:6dd0b768-ba84-4768-8b63-d711172a9565","Physical modelling of landslides induced by rainfall","Askarinejad, A. (TU Delft Geo-engineering)","","2015","Landslides triggered by hydraulic perturbations are initiated by a decrease in the effective stress, and hence the shear strength of the soil, as a result of the increase in pore water pressure which might occur due to either rain infiltration or exfiltration of water from the bedrock. However, several factors including the shape and hydraulic properties of the bedrock, root reinforcement have significant effects on the behaviour of the slope alongside the geo-mechanical properties of the overlaying soil. The complex interactions between these processes impose serious challenges in prediction of the occurrence and extends of this type of landslides. This paper presents the findings of a full scale landslide triggering experiment on a steep forested slope and several centrifuge tests which were performed to investigate the mechanisms leading to the initiation and propagation of the shear deformations in an unsaturated silty sand slope. The results observed from the test site illustrated the close interaction between the pore pressure development and rate of movements. Precursors of movements were detected before the failure using the horizontal soil pressure measurements, and surface and subsurface records. The centrifuge tests also showed that, the geometry of the bedrock, in addition to the hydrogeological effects, and vegetation reinforcement can play an important role in the stability of the slope.","","en","abstract","","","","","","","","","","","Geo-engineering","","",""
"uuid:0eb7fdea-b547-4bb3-a5d8-e1cece41f6fb","http://resolver.tudelft.nl/uuid:0eb7fdea-b547-4bb3-a5d8-e1cece41f6fb","Consolidation and strength development by horizontal drainage of soft mud deposits in Lake Markermeer","Barciela Rial, M. (TU Delft Environmental Fluid Mechanics); Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares); Griffioen, Jasper (Universiteit Utrecht; TNO); van Kessel, Thijs (Deltares)","","2015","","","en","abstract","","","","","","","","","","","Environmental Fluid Mechanics","","",""
"uuid:18af8fac-4ca4-4824-80ac-bc4a9584aad3","http://resolver.tudelft.nl/uuid:18af8fac-4ca4-4824-80ac-bc4a9584aad3","Using geodetic measurements to improve estimates of Antarctica's GIA and present-day mass balance","Gunter, B.C. (Georgia Institute of Technology); Engels, Olga (TU Delft Physical and Space Geodesy); Riva, R.E.M. (TU Delft Physical and Space Geodesy); Meister, R. (Technical University of Denmark); Muir, Alan (University College London (UCL)); King, M.A. (University of Tasmania); van den Broeke, M.R. (Universiteit Utrecht); Hashemi Farahani, H. (TU Delft Physical and Space Geodesy); Ditmar, P.G. (TU Delft Physical and Space Geodesy)","","2015","","","en","abstract","","","","","","","","","","","Physical and Space Geodesy","","",""
"uuid:ae38d8e5-667c-4a4c-ace2-5ba6eae1aeb6","http://resolver.tudelft.nl/uuid:ae38d8e5-667c-4a4c-ace2-5ba6eae1aeb6","The magmatic system beneath Torfajökull volcano, Iceland, throughradar and seismic interferometric analysis","Martins, Joana E. (TU Delft Mathematical Geodesy and Positioning); Hooper, Andy (University of Leeds); Ruigrok, E.N. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Hanssen, R.F. (TU Delft Mathematical Geodesy and Positioning); White, Robert (University of Cambridge); Soosalu, Heidi (Tallinn University)","","2014","Torfajökull is the largest silicic volcanic centre in Iceland lying at the intersection of the rift zone (MidAtlantic Ridge) and the transform zone that connects to Reykjanes peninsula. It erupts infrequently,with only two eruptions in the last 1200 years, the latest of which was over 5 centuries ago. Yet, itsactive tectonic setting, persistent high and low frequency seismicity, deformation and geothermalactivity within its large caldera (18x12 km diameter) indicate the continued presence of a long-lasting magma chamber. Here we speculate on possible geometry, size and depth of the Torfajökullmagma chamber by using radar interferometry (InSAR) and seismic interferometry (SI).Using InSAR time series analysis we detect a surface subsidence pattern at rates of up to ~13 mm yr-1in the SW region of Torfajökull ́s caldera, on-going since at least 1993. The subsidence rate isconstant in time, and perhaps due to a cooling magma chamber. The data can be fit reasonably wellusing a model of a NE-SW oriented spheroidal body at ~5 km depth. As the deflating area correlatesspatially with the area of geothermal activity, deflation may also be the surface response due to anactive hydrothermal circulation.To gain more insight into the geometry of Torfajökull’s magmatic system and rock properties of thesubsurface, we apply ambient noise seismic interferometry (SI) by cross-correlation of ambient noise.With this technique we can detect velocity variations, which can correspond to the edges of dikes ormolten magma bodies. Our tomographic results give reliable results of velocity variations within adepth range of 2 km to 7.5 km. We find high velocity zones that we interpret as old dike intrusions.Low velocity anomalies (>5%), which usually indicate the presence of warmer material, are locatedon the southeast and southwest part of the volcano, outside the volcano caldera.Finally we compare both InSAR and SI results. The hypothesis of a magma chamber under thesubsidence area detected by InSAR does not seem to fit the tomographic results, as the expectededges of a magma body modelled by InSAR are not clearly identified by the SI results. If there is anestablished magma chamber within Torfajökull caldera this is likely to be bellow 7km depth.","InSAR; ambient noise tomography (ANT); volcano; interferometry; Torfajokull volcano","en","abstract","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:11ad55bb-7bb5-47c5-ab11-384dfd96ea4b","http://resolver.tudelft.nl/uuid:11ad55bb-7bb5-47c5-ab11-384dfd96ea4b","Advances in the Rising Bubble Technique for discharge measurement","Hilgersom, K.P. (TU Delft Water Resources); Luxemburg, W.M.J. (TU Delft Water Resources); Willemsen, Geert; Bussmann, Luuk","","2014","Already in the 19th century, d’Auria described a discharge measurement technique that applies floats to find the depth-integrated velocity (d’Auria, 1882). The basis of this technique was that the horizontal distance that the float
travels on its way to the surface is the image of the integrated velocity profile over depth. Viol and Semenov (1964) improved this method by using air bubbles as floats, but still distances were measured manually until Sargent (1981) introduced a technique that could derive the distances from two photographs simultaneously taken from each side of the river bank. Recently, modern image processing techniques proved to further improve the applicability of the method (Hilgersom and Luxemburg, 2012).
In the 2012 article, controlling and determining the rising velocity of an air bubble still appeared a major challenge for the application of this method. Ever since, laboratory experiments with different nozzle and tube sizes lead to advances in our self-made equipment enabling us to produce individual air bubbles with a more constant rising velocity.
Also, we introduced an underwater camera to on-site determine the rising velocity, which is dependent on the water temperature and contamination, and therefore is site-specific. Camera measurements of the rising velocity proved
successful in a laboratory and field setting, although some improvements to the setup are necessary to capture the air bubbles also at depths where little daylight penetrates.","","en","abstract","","","","","","","","","","","Water Resources","","",""
"uuid:a5128330-85fd-4d9b-b4f3-c8d233c83bfa","http://resolver.tudelft.nl/uuid:a5128330-85fd-4d9b-b4f3-c8d233c83bfa","Preliminary identification of minerals in silt- and sand-size grains on mars from phoenix om images using three-channel color photometry","Velbel, M.A. (Michigan State University); Goetz, W. (Max-Planck-Institut fur Sonnensystemforschung); Hecht, M.H. (Jet Propulsion Lab, Pasadena, CA; MIT Haystack Observatory); Hviid, S.F. (Max-Planck-Institut fur Sonnensystemforschung); Madsen, M.B. (University of Copenhagen); Pike, W.T. (Imperial College London); Staufer, U. (TU Delft Micro and Nano Engineering)","","2014","","","en","abstract","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:56df4730-6e51-4d24-9f4e-5a4acb4cf55d","http://resolver.tudelft.nl/uuid:56df4730-6e51-4d24-9f4e-5a4acb4cf55d","Rhine Estuary Closable but Open: An integrated systems approach to floodproofing the Rhine and Meuse estuaries in the 21st century","Rijcken, T. (TU Delft Hydraulic Structures and Flood Risk); Kok, M. (TU Delft Hydraulic Structures and Flood Risk)","","2010","In the spring of 2008, Delft University of Technology wrote a report for the Second Delta Committee, a body set up to advise the Dutch government and parliament on the Netherlands’ long-term flood risk policy. The Delft report included a colourful drawing of a solution for Rotterdam and the Drecht Cities, and the Delta Committee used this image to illustrate their ‘closable-but-open’ recommendation for the Rhine-Meuse estuary and explicitly recommended further research.","","en","abstract","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""