"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:a08a993e-a57c-4bc0-8702-2148a6f1b70e","http://resolver.tudelft.nl/uuid:a08a993e-a57c-4bc0-8702-2148a6f1b70e","Fast particle-mesh code for Milgromian dynamics","Visser, P.M. (TU Delft Mathematical Physics); Eijt, S.W.H. (TU Delft RST/Fundamental Aspects of Materials and Energy); de Nijs, J.V. (Student TU Delft)","","2024","Context. Modified Newtonian dynamics (MOND) is a promising alternative to dark matter. To further test the theory, there is a need for fluid- and particle-dynamics simulations. The force in MOND is not a direct particle-particle interaction, but derives from a potential for which a nonlinear partial differential equation (PDE) needs to be solved. Normally, this makes the problem of simulating dynamical evolution computationally expensive. Aims. We intend to develop a fast particle-mesh (PM) code for MOND (the AQUAL formalism). Methods. We transformed the nonlinear equation for MOND into a system of linear PDEs plus one algebraic equation. An iterative scheme with the fast Fourier transform (FFT) produces successively better numerical approximations. Results. The algorithm was tested for dynamical systems in MOND where analytical solutions are known: the two-body problem, a body with a circular ring, and a spherical distribution of particles in thermal equilibrium in the self-consistent potential. Conclusions. The PM code can accurately calculate the forces at subpixel scale and reproduces the analytical solutions. Four iterations are required for the potential, but when the spatial steps are small compared to the kernel width, one iteration is suffices. The use of a smoothing kernel for the accelerations is inevitable in order to eliminate the self-gravity of the point particles. Our PDE solver is 15 to 42 times as slow as a standard Poisson solver. However, the smoothing and particle propagation takes up most of the time above one particle per 10 3 pixels. The FFTs, the smoothing, and the propagation part in the code can all be parallelized.","gravitation; numerical; planets and satellites: general – planets and satellites: formation; Galaxies: kinematics and dynamics; Galaxies: formation; Cosmology; dark matter theory","en","journal article","","","","","","","","","","","Mathematical Physics","","",""
"uuid:8509576d-038d-475b-a89d-f913de6ec826","http://resolver.tudelft.nl/uuid:8509576d-038d-475b-a89d-f913de6ec826","Investigating the influence of pigmentation on the electrolyte transport properties of organic coatings using ORP-EIS","Madelat, Negin (Vrije Universiteit Brussel); Wouters, Benny (Vrije Universiteit Brussel); Visser, Peter (Akzo Nobel); Jiryaeisharahi, Zahra (Vrije Universiteit Brussel); Marcoen, Kristof (Vrije Universiteit Brussel); Abrahami, S.T. (TU Delft Team Shoshan Abrahami); Hubin, Annick (Vrije Universiteit Brussel); Terryn, H.A. (Vrije Universiteit Brussel); Hauffman, Tom (Vrije Universiteit Brussel)","","2024","In this work, the correlation between electrolyte transport properties and the variation of pigment volume concentration (PVC) in a series of organic coatings is explored. Using an odd random phase electrochemical impedance spectroscopy (ORP-EIS) approach, the diffusion of ions independent from water take-up is analysed. A higher PVC resulted in a more homogeneous coating morphology, which could be associated with a faster diffusion of ions following a Fickian regime and enhanced water uptake. In the case of lower pigment loading, the obtained heterogenous morphology of the coating introduced new challenges to the physical interpretation of the proposed electrochemical equivalent circuit.","GDOES; Ion diffusion; Organic coating; ORP-EIS; Water uptake","en","journal article","","","","","","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.","","2024-05-22","","","Team Shoshan Abrahami","","",""
"uuid:16b3382f-fbfd-4d0a-a848-4bfcebb8840d","http://resolver.tudelft.nl/uuid:16b3382f-fbfd-4d0a-a848-4bfcebb8840d","Review of the state of art of Li-based inhibitors and coating technology for the corrosion protection of aluminium alloys","Li, Z. (TU Delft Team Arjan Mol); Visser, Peter (Akzo Nobel); Hughes, Anthony E. (CSIRO Mineral Resources); Homborg, A.M. (TU Delft Team Arjan Mol; Netherlands Defence Academy); Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2024","The quest for novel alternatives to hexavalent-chromium-based corrosion inhibitors is of utmost significance and urgency. Strict international health and safety regulations, due to growing concerns regarding the impact of hexavalent chromium on human health and the environment, have pushed the commercial introduction of many alternative inhibitor types, but the implementation of alternative active protective primers for structural parts in the aerospace industry is still pending. This endeavour has proven to be remarkably challenging, as the potential replacement coating types must meet numerous functional requirements encompassing cost-effectiveness and exceptional corrosion protection for intrinsically corrosion susceptible aerospace aluminium alloys. In recent years, considerable attention has been drawn to lithium salts as environmentally friendly corrosion inhibitors forming the basis for a novel active protective coating technology. The involvement of lithium ions has been shown to play a pivotal role in the conversion process of aluminium alloy surfaces by stabilizing the reaction products, thereby facilitating the gradual development of a protective layer with a multi-layered configuration, which exhibits considerable variability in morphology, depending on local chemical and electrochemical conditions. The versatility of the lithium-based corrosion protection extends to their application as corrosion inhibiting pigments in organic coatings or as a pre-treatment, directly forming conversion layers, thereby enhancing their practical implementation. However, previous chromate replacement reviews only introduced the promising outcomes provided by the lithium technology, omitting key details of its development and formation mechanism. This paper critically reviews and summarizes the studies conducted to date on lithium-based inhibitor technologies for the corrosion protection of aluminium alloys as well as topics to be investigated in the future.","Aluminium alloy; Coating technology; Corrosion protection; lithium inhibitor","en","journal article","","","","","","","","","","","Team Arjan Mol","","",""
"uuid:5b59bf07-cbe2-4b15-bed7-11cd5ba891ac","http://resolver.tudelft.nl/uuid:5b59bf07-cbe2-4b15-bed7-11cd5ba891ac","GRACE-FO radiation pressure modelling for accurate density and crosswind retrieval","Hladczuk, N.A. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Kodikara, T. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Siemes, C. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering)","","2024","Uncertainties in radiation pressure modelling play a significant role in the thermospheric density and crosswind observations derived from the GRACE-FO accelerometer, especially during low solar activity. Under such conditions, the radiation pressure acceleration matches the magnitude of the aerodynamic acceleration along the track and exceeds it in the cross-track direction. The GRACE-FO mission has been operating for several years at such high altitudes during both low and rising solar activity, providing a perfect opportunity to study the effects of radiation pressure. This research uses ray tracing based on a high-fidelity satellite geometry model to calculate the radiation pressure acceleration. We numerically fine-tuned the coefficients describing the thermo-optical surface properties to obtain more accurate radiation pressure accelerations than those specified in the GRACE-FO mission manual. We also used in situ temperature measurements from thermistors on the solar arrays to model the satellite's thermal emission. These temperature measurements allowed a realistic setup of the thermal model, extended by the parameter describing the efficiency of the solar cells, and reproduced the acceleration of the thermal emission with an accuracy of RMS 0.148 nms−2. The combination of the updated thermal model and the fine-tuning of the surface coefficients improved the accuracy of the crosswind acceleration to an RMS of 0.55 nms−2, compared to an RMS of 4.22 nms−2 when using panel models and instantaneous thermal radiation. We compared the observed crosswind with two models: HWM14 and TIE-GCM. While both models capture most of the salient features of the observed crosswind, HWM14 shows particularly good agreement at high latitudes. Compared to the previously employed radiation pressure model, the crosswind observations have been improved in low and mid-latitudes, especially during periods of higher solar activity. Since the effect of radiation pressure is most significant in the crosswind direction, the effect on density was small compared to previously published datasets.","GRACE-FO; Neutral mass density; Neutral winds; Radiation pressure; Thermal emission; Thermosphere","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:7bc0145f-3e4b-4947-9617-9f71462394be","http://resolver.tudelft.nl/uuid:7bc0145f-3e4b-4947-9617-9f71462394be","A 0D Model for the Comparative Analysis of Hydrogen Carriers in Ship’s Integrated Energy Systems","Van Rheenen, E.S. (TU Delft Ship Design, Production and Operations); Padding, J.T. (TU Delft Complex Fluid Processing); Visser, K. (TU Delft Ship Design, Production and Operations)","","2024","Hydrogen carriers are attractive alternative fuels for the shipping sectors. They are zero-emission, have high energy densities, and are safe, available, and easy to handle. Sodium borohydride, potassium borohydride, dibenzyltoluene, n-ethylcarbazole, and ammoniaborane are interesting hydrogen carriers, with high theoretical energy densities. The exact energy density of these hydrogen carriers depends on the integration of heat and mass with the energy converters. This combination defines the energy efficiency and, thus, the energy density of the system. Using a 0D model, we combined the five carriers with two types of fuel cells (PEM and SOFC), an internal combustion engine and a gas turbine. This resulted in 20 combinations. Despite the limitations of the 0D model and the occasional difficulty of validating input values, this model still produces exciting findings, which are valuable for further research. For the dehydrogenation of both dibenzyltoluene and n-ethylcarbazole, an external hydrogen burner is required if no waste heat resources from the integrated system are available. For the borohydrides, on the other hand, energy integration is essential for reducing cooling power. Dehydrogenation produces substantial energy, but only a fraction of this energy can be used for internal preheating. Dehydrogenation of ammoniaborane produces less energy. Among all hydrogen carriers, both ammoniaborane and sodium borohydride provide energy densities comparable to that of marine diesel oil. In particular, ammoniaborane possesses a remarkably high energy density. Thus, we conclude, that hydrogen carriers are attractive alternative fuels that deserve more attention, including their potential performance for hydrogen imports.
2 for the along-track component and 13 nm/s 2 for the cross-track component. The laser residuals converge at approximately 1.02 cm and the Doppler residuals are on the level of 0.406 mm/s, the radial orbit difference to the CNES POE-F (Precision Orbit Ephemeris version F) orbits narrows to 6.5 mm. Tracking residuals are not evenly distributed for DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) beacons, the South Atlantic Anomaly effect is for instance clearly visible in the first empirical orthogonal function EOF mode of monthly binned DORIS residuals. After consideration of all possible TVG approaches our conclusion is that 3 hourly AOD1B model fields result in a small but visible improvement. The addition of TVG from GRACE and GRACE-FO is implemented in two different ways from which we can select a version that does lead to a reduction in the Doppler tracking residuals and which does reduce the level of solved for empirical accelerations.","Orbit determination; Temporal gravity modelling; Performance analysis","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:fc6a556b-6541-40aa-bf1a-6b19c730880a","http://resolver.tudelft.nl/uuid:fc6a556b-6541-40aa-bf1a-6b19c730880a","CryoSat Long-Term Ocean Data Analysis and Validation: Final Words on GOP Baseline-C","Naeije, M.C. (TU Delft Astrodynamics & Space Missions); Di Bella, Alessandro (ESRIN); Geminale, Teresa (Defence & Aerospace Digital Factory); Visser, P.N.A.M. (TU Delft Space Engineering)","","2023","ESA’s Earth explorer mission CryoSat-2 has an ice-monitoring objective, but it has proven to also be a valuable source of observations for measuring impacts of climate change over oceans. In this paper, we report on our long-term ocean data analysis and validation and give our final words on CryoSat-2’s Geophysical Ocean Products (GOP) Baseline-C. The validation is based on a cross comparison with concurrent altimetry and with in situ tide gauges. The highlights of our findings include GOP Baseline-C showing issues with the ionosphere and pole tide correction. The latter gives rise to an east–west pattern in range bias. Between Synthetic Aperture Radar (SAR) and Low-Resolution Mode (LRM), a 1.4 cm jump in range bias is explained by a 0.5 cm jump in sea state bias, which relates to a significant wave height SAR-LRM jump of 10.5 cm. The remaining 0.9 cm is due to a range bias between ascending and descending passes, exhibiting a clear north–south pattern and ascribed to a timing bias of +0.367 ms, affecting both time-tag and elevation. The overall range bias of GOP Baseline-C is established at −2.9 cm, referenced to all calibrated concurrent altimeter missions. The bias drift does not exceed 0.2 mm/yr, leading to the conclusion that GOP Baseline-C is substantially stable and measures up to the altimeter reference missions. This is confirmed by tide gauge comparison with a selected set of 309 PSMSL tide gauges over 2010–2022: we determined a correlation of R = 0.82, a mean standard deviation of (Formula presented.) cm (common reference and GIA corrected), and a drift of 0.17 mm/yr. In conclusion, the quality, continuity, and reference of GOP Baseline-C is exceptionally good and stable over time, and no proof of any deterioration or platform aging has been found. Any improvements for the next CryoSat-2 Baselines could come from sea state bias optimization, ionosphere and pole tide correction improvement, and applying a calibrated value for any timing biases.","altimetry; CAL/VAL; bias; CryoSat-2; GOP Baseline-C; cross-over and tide gauge analyses","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:fc38c58e-2717-4a41-8564-0d7d0110c59a","http://resolver.tudelft.nl/uuid:fc38c58e-2717-4a41-8564-0d7d0110c59a","Hazard Identification of Hydrogen-Based Alternative Fuels Onboard Ships","Van Rheenen, E.S. (TU Delft Ship Design, Production and Operations); Scheffers, E.L. (TU Delft Ship Design, Production and Operations); Zwaginga, J.J. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations)","","2023","It is essential to use alternative fuels if we are to reach the emission reduction targets set by the IMO. Hydrogen carriers are classified as zero-emission, while having a higher energy density (including packing factor) than pure hydrogen. They are often considered as safe alternative fuels. The exact definition of what safety entails is often lacking, both for hydrogen carriers as well as for ship safety. The aim of this study is to review the safety of hydrogen carriers from two perspectives, investigating potential connections between the chemical and maritime approaches to safety. This enables a reasoned consideration between safety aspects and other design drivers in ship design and operation. The hydrogen carriers AB, NaBH4, KBH4 and two LOHCs (NEC and DBT) are taken into consideration, together with a couple reference fuels (ammonia, methanol and MDO). After the evaluation of chemical properties related to safety and the scope of the current IMO safety framework, it can be concluded that safety remains a vague and non-explicit concept from both perspectives. Therefore, further research is required to prove the safe application of hydrogen carriers onboard ships.","safety; hydrogen carriers; Hazard identification; marine transportation; Marine engineering; Alternative Fuels; Methanol; Ammonia","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:ce210766-ea39-4126-a127-c1bef6386f29","http://resolver.tudelft.nl/uuid:ce210766-ea39-4126-a127-c1bef6386f29","Hydrogen carriers for zero-emission ship propulsion using PEM fuel cells: an evaluation","Van Rheenen, E.S. (TU Delft Ship Design, Production and Operations); Padding, J.T. (TU Delft Complex Fluid Processing); Slootweg, J. C. (Universiteit van Amsterdam); Visser, K. (TU Delft Ship Design, Production and Operations)","","2023","Green hydrogen combined with PEM fuel cell systems is a viable option to meet the demand for alternative maritime fuels. However, hydrogen storage faces challenges, including low volumetric density, fire and explosion risks and transport challenges. We assessed over fifteen hydrogen carriers based on their maritime performance characteristics to determine their suitability for shipboard use. Evaluation criteria included energy density, locally zero-emission, circularity of process, safety, dehydrogenation process, logistic availability and handling. Thus, excluding ammonia and methanol because of these constraints, we found that borohydrides, liquid organic hydrogen carriers and ammoniaborane are the most promising hydrogen carriers to use on ships with PEM fuel cells. Borohydrides, specifically sodium borohydride, have high energy densities but face regeneration issues. The liquid organic hydrogen carrier dibenzyltoluene has a lower energy density but exhibits easy hydrogenation and good handling. Given varying operational demands, we developed a framework to assess the suitability of hydrogen carriers for use in different ship categories. Evaluating the three types of hydrogen carriers, using our framework and considering current practices, shows that these are viable options for almost all ship types. Thus, we have identified three types of hydrogen carriers, which should be the focus of future research.","alternative fuels; Hydrogen; hydrogen carriers; liquid hydrogen carriers; maritime transportation; solid hydrogen carriers","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:45360441-9fe4-4e2a-875a-9bf4be5f9eae","http://resolver.tudelft.nl/uuid:45360441-9fe4-4e2a-875a-9bf4be5f9eae","Daedalus MASE (mission assessment through simulation exercise): A toolset for analysis of in situ missions and for processing global circulation model outputs in the lower thermosphere-ionosphere","Sarris, Theodore E. (Democritus University of Thrace); Tourgaidis, Stelios (Democritus University of Thrace); Pirnaris, Panagiotis (Democritus University of Thrace); Baloukidis, Dimitris (Democritus University of Thrace); Papadakis, Konstantinos (Democritus University of Thrace; Viikki Biocenter 1); Doornbos, Eelco (Royal Netherlands Meteorological Institute (KNMI)); Siemes, C. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions)","","2023","Daedalus MASE (Mission Assessment through Simulation Exercise) is an open-source package of scientific analysis tools aimed at research in the Lower Thermosphere-Ionosphere (LTI). It was created with the purpose to assess the performance and demonstrate closure of the mission objectives of Daedalus, a mission concept targeting to perform in-situ measurements in the LTI. However, through its successful usage as a mission-simulator toolset, Daedalus MASE has evolved to encompass numerous capabilities related to LTI science and modeling. Inputs are geophysical observables in the LTI, which can be obtained either through in-situ measurements from spacecraft and rockets, or through Global Circulation Models (GCM). These include ion, neutral and electron densities, ion and neutral composition, ion, electron and neutral temperatures, ion drifts, neutral winds, electric field, and magnetic field. In the examples presented, these geophysical observables are obtained through NCAR’s Thermosphere-Ionosphere-Electrodynamics General Circulation Model. Capabilities of Daedalus MASE include: 1) Calculations of products that are derived from the above geophysical observables, such as Joule heating, energy transfer rates between species, electrical currents, electrical conductivity, ion-neutral collision frequencies between all combinations of species, as well as height-integrations of derived products. 2) Calculation and cross-comparison of collision frequencies and estimates of the effect of using different models of collision frequencies into derived products. 3) Calculation of the uncertainties of derived products based on the uncertainties of the geophysical observables, due to instrument errors or to uncertainties in measurement techniques. 4) Routines for the along-orbit interpolation within gridded datasets of GCMs. 5) Routines for the calculation of the global coverage of an in situ mission in regions of interest and for various conditions of solar and geomagnetic activity. 6) Calculations of the statistical significance of obtaining the primary and derived products throughout an in situ mission’s lifetime. 7) Routines for the visualization of 3D datasets of GCMs and of measurements along orbit. Daedalus MASE code is accompanied by a set of Jupyter Notebooks, incorporating all required theory, references, codes and plotting in a user-friendly environment. Daedalus MASE is developed and maintained at the Department for Electrical and Computer Engineering of the Democritus University of Thrace, with key contributions from several partner institutions.","daedalus MASE; daedalus mission; GCM; global circulation model; in situ measurements; lower thermosphere ionosphere; LTI","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:ec913c48-20ce-4750-8d57-83cdad827cea","http://resolver.tudelft.nl/uuid:ec913c48-20ce-4750-8d57-83cdad827cea","The effects of fuel type and cathode off-gas recirculation on combined heat and power generation of marine SOFC systems","van Veldhuizen, B.N. (TU Delft Ship Design, Production and Operations); van Biert, L. (TU Delft Ship Design, Production and Operations); Amladi, A. (Rijksuniversiteit Groningen); Woudstra, T. (Rijksuniversiteit Groningen); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (Rijksuniversiteit Groningen)","","2023","An increasing demand in the marine industry to reduce emissions led to investigations into more efficient power conversion using fuels with sustainable production pathways. Solid Oxide Fuel Cells (SOFCs) are under consideration for long-range shipping, because of its high efficiency, low pollutant emissions, and fuel flexibility. SOFC systems also have great potential to cater for the heat demand in ships, but the heat integration is not often considered when assessing its feasibility. This study evaluates the electrical and heat efficiency of a 100 kW SOFC system for marine applications fuelled with methane, methanol, diesel, ammonia, or hydrogen. In addition, cathode off-gas recirculation (COGR) is investigated to tackle low oxygen utilisation and thus improve heat regeneration. The software Cycle Tempo is used to simulate the power plant, which uses a 1D model for the SOFCs. At nominal conditions, the highest net electrical efficiency (LHV) was found for methane (58.1%), followed by diesel (57.6%), and ammonia (55.1%). The highest heat efficiency was found for ammonia (27.4%), followed by hydrogen (25.6%). COGR resulted in similar electrical efficiencies, but increased the heat efficiency by 11.9% to 105.0% for the different fuels. The model was verified with a sensitivity analysis and validated by comparison with similar studies. It is concluded that COGR is a promising method to increase the heat efficiency of marine SOFC systems.","Alternative fuels; Heat integration; Ships; Solid Oxide Fuel Cell; Sustainability; Thermodynamic analysis","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:2d87e9dd-f83e-4e8c-bbfa-df48f3fcacf4","http://resolver.tudelft.nl/uuid:2d87e9dd-f83e-4e8c-bbfa-df48f3fcacf4","Unleashing or domesticating the vitality of citizens' initiatives? The paradoxical relationship between governments and citizens' initiatives in the energy transition","Visser, Vivian (Erasmus Universiteit Rotterdam); van Popering-Verkerk, Jitske (Erasmus Universiteit Rotterdam); Minkman, E. (TU Delft Organisation & Governance); van Buuren, Arwin (Erasmus Universiteit Rotterdam)","","2023","In their quest to create vital cities, West European city governments stimulate citizens to self-organize in citizens' initiatives. This trend it accompanied by conflicting scientific and governmental discourses: on the one hand, citizens' initiatives are praised for giving ‘power to the people’, on the other hand, citizens' initiatives are understood as mere ‘tools’ to roll-out government policies. By adopting a critical-constructive perspective, this study sets out to better understand the paradoxical attitudes of local governments toward the potential of CIs for stimulating urban vitality. We do so by uncovering patterns that explain the opening and closing of spaces for citizens to develop their initiatives. To this end, we conducted an in-depth case study into the relation between the local government and citizens initiatives in the energy transition in Rotterdam (the Netherlands). Our findings reveal that a configuration of different explanatory mechanisms leads to the ‘domestication’ of initiatives, which jeopardizes their unique transformative potential that can contribute to the vitality of cities.","Citizens' initiatives; Community initiatives; Energy transition; Governmentality; Invited space; Self-organization","en","journal article","","","","","","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.","","2023-09-21","","","Organisation & Governance","","",""
"uuid:32cd474b-0c23-4667-bef1-fad322e45b59","http://resolver.tudelft.nl/uuid:32cd474b-0c23-4667-bef1-fad322e45b59","The Effect of Ambient Ageing on the Corrosion Protective Properties of a Lithium-Based Conversion Layer","Li, Z. (TU Delft Team Arjan Mol); Homborg, A.M. (TU Delft Team Arjan Mol; Netherlands Defence Academy); Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia); Visser, Peter (Akzo Nobel); Soleimani, M. (TU Delft Team Peyman Taheri); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2023","The influence of ageing under ambient conditions on the corrosion protective behaviour of a lithium-based conversion layer on AA2024-T3 is studied in this work. Conversion layers aged at ambient conditions for relatively short times (0 h and 4 h), show an initial high degree of corrosion inhibition but a much lower protectiveness after the inhibition stage terminates. Conversion layers with relatively long ageing times (24 h and 72 h) show a rather stable corrosion resistance which is higher than that of short-time aged samples. It is hypothesized that the freshly-formed conversion layer has trapped a certain amount of lithium ions and water molecules, leading to ongoing and heterogeneous growth of the conversion layer with time under ambient indoor conditions. Moreover, conversion layers with short ageing times show early-stage active corrosion protection by lithium-ion release.","ageing; Aluminium alloy; corrosion inhibition; electrochemical noise; lithium-based conversion layer","en","journal article","","","","","","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.","","2023-09-17","","","Team Arjan Mol","","",""
"uuid:02e0378c-9721-43d5-84d9-dcffa08cc9cf","http://resolver.tudelft.nl/uuid:02e0378c-9721-43d5-84d9-dcffa08cc9cf","Transitioning Together, sparking change towards the energy transition: A handbook on Social Contagion","de Koning, J.I.J.C. (TU Delft Design for Sustainability); van Dam, S.S. (TU Delft Design for Sustainability); Boele, Charlotte (Universiteit Utrecht); Buskens, Vincent (Universiteit Utrecht); Chan, Josephine (Student TU Delft); Onencan, Abby (Erasmus Universiteit Rotterdam); Ou, Jiamin (Universiteit Utrecht); Van de Rijt, Arnout (European University Institute); Shah, Jesal (oneUp B.Val); Schneider, Philip (Universiteit Utrecht); Visser, Rose (Student TU Delft)","","2023","Having directly observed one of the most rapidly spreading global pandemics, we understand more than ever the power of contagion. In today’s interconnected world, trends originating in one corner, whether it’s a disease, clothing fashion, or an online social media challenge, can swiftly gain momentum on the opposite side of the globe, often within a matter of days or even hours. This rapid diffusion is enabled by our globalised world and developments in technology and ICT. Social networks and social influence are strong influencers in shaping our attitudes and behaviour. However, this influence can be a double-edged sword. On the one hand, it brings people and cultures together, it facilitates the exchange of information and resources. On the other hand, it can be easily exploited to spread misinformation and exert pressure on individuals to engage in negative behaviours like smoking or violence. This phenomenon is commonly referred to as ‘social contagion.’
In this handbook you can find the result of ENRGISED: Engaging Residents in green energy investments through social networks, complexity and design. In 2019 we saw an impasse in the Dutch energy transition, where many technologies were available but not many people were taking action. Since then, global events, such as Covid 19 and the invasion of Ukraine, have disrupted our world and the energy market. In the midst of these changes we conducted our research. Between 2020 and 2023, we studied the use of social contagion - social influence and the effect of social networks - towards the energy transition in neighbourhoods in the Netherlands.","Social Contagion; Behaviour Change; Energy Transition; Social Influence; Network Theory; Toolkit; Design","en","book","Delft Universtity of Technology","978-94-6366-774-6","","","","","","","","","Design for Sustainability","","",""
"uuid:a2e11353-022f-492b-baed-18ac55ce85aa","http://resolver.tudelft.nl/uuid:a2e11353-022f-492b-baed-18ac55ce85aa","Local scanning electrochemical microscopy analysis of a lithium-based conversion layer on AA2024-T3 at progressive stages of formation","Li, Z. (TU Delft Team Arjan Mol); Li, G. (TU Delft Team Maria Santofimia Navarro); Visser, Peter (Akzo Nobel); Homborg, A.M. (TU Delft Team Arjan Mol; Netherlands Defence Academy); Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2023","Scanning electrochemical microscopy (SECM) is employed to characterize the evolution of local electrochemical surface activity during lithium-based conversion layer formation on legacy aerospace aluminium alloy AA2024-T3. Initially, three types of studied intermetallic particles - S-, θ- and constituent phases - act as active cathodic areas. Subsequently, θ- and constituent phases show passivation preceding that of S-phase particles during the later conversion layer formation stages. The entire surface, including the matrix region, shows a higher reactivity at the beginning and then gradually shows decreasing reactivity. Hydrogen evolution-generated bubbles attach to the alloy surface and locally hinder the conversion layer formation, weakening the corrosion protection the conversion layer provides at those locations.","Aluminium alloy; Inhibitor; Lithium-based conversion layer; SECM","en","journal article","","","","","","","","","","","Team Arjan Mol","","",""
"uuid:b1cc8472-32c6-468b-9eb0-f68793a88ff8","http://resolver.tudelft.nl/uuid:b1cc8472-32c6-468b-9eb0-f68793a88ff8","Design and testing of star tracker algorithms for autonomous optical line-of-sight deep-space navigation","Casini, S. (TU Delft Space Systems Egineering); Cervone, A. (TU Delft Astrodynamics & Space Missions); Monna, G.L.E. (TU Delft Bio-Electronics; Phosphoenix); Visser, P.N.A.M. (TU Delft Space Engineering)","","2023","This paper aims to investigate the capabilities of exploiting optical line-of-sight navigation using star trackers. First, a synthetic image simulator is developed to generate realistic images, which is later exploited to test the star tracker's performance. Then, generic considerations regarding attitude estimation are drawn, highlighting how the camera's characteristics influence the accuracy of the estimation. The full attitude estimation chain is designed and analyzed in order to maximize the performance in a deep-space cruising scenario. After that, the focus is shifted to the actual planet-centroiding algorithm, with particular emphasis on the illumination compensation routine, which is shown to be fundamental to achieving the required navigation accuracy. The influence of the center of the planet within the singular pixel is investigated, showing howthis uncontrollable parameter can lower performance. Finally, the complete algorithm chain is tested with the synthetic image simulator in a wide range of scenarios. The final promising results show that with the selected hardware, even in the higher noise condition, it is possible to achieve a direction's azimuth and elevation angle error in the order of 1-2 arc sec for Venus, and below 1 arc sec for Jupiter, for a spacecraft placed at 1 AU from the Sun. These values finally allow for a positioning error below 1000 km, which is in line with the current non-autonomous navigation state-of-the-art.","","en","journal article","","","","","","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.","","2024-02-05","","Space Engineering","Space Systems Egineering","","",""
"uuid:e5dbdf4d-93ad-4be6-abee-78eee70f1a90","http://resolver.tudelft.nl/uuid:e5dbdf4d-93ad-4be6-abee-78eee70f1a90","Planetary Radio Interferometry and Doppler Experiment (PRIDE) of the JUICE Mission","Gurvits, L. (TU Delft Astrodynamics & Space Missions; Joint Institute for VLBI ERIC); Cimò, Giuseppe (Joint Institute for VLBI ERIC); Dirkx, D. (TU Delft Astrodynamics & Space Missions); Pallichadath, V. (TU Delft Astrodynamics & Space Missions); Altobelli, Nicolas (European Space Astronomy Centre); Bocanegra Bahamon, T.M. (TU Delft Astrodynamics & Space Missions; California Institute of Technology); Cazaux, S.M. (TU Delft Astrodynamics & Space Missions); Vermeersen, L.L.A. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering)","","2023","Planetary Radio Interferometry and Doppler Experiment (PRIDE) is a multi-purpose experimental technique aimed at enhancing the science return of planetary missions. The technique exploits the science payload and spacecraft service systems without requiring a dedicated onboard instrumentation or imposing on the existing instrumentation any special for PRIDE requirements. PRIDE is based on the near-field phase-referencing Very Long Baseline Interferometry (VLBI) and evaluation of the Doppler shift of the radio signal transmitted by spacecraft by observing it with multiple Earth-based radio telescopes. The methodology of PRIDE has been developed initially at the Joint Institute for VLBI ERIC (JIVE) for tracking the ESA’s Huygens Probe during its descent in the atmosphere of Titan in 2005. From that point on, the technique has been demonstrated for various planetary and other space science missions. The estimates of lateral position of the target spacecraft are done using the phase-referencing VLBI technique. Together with radial Doppler estimates, these observables can be used for a variety of applications, including improving the knowledge of the spacecraft state vector. The PRIDE measurements can be applied to a broad scope of research fields including studies of atmospheres through the use of radio occultations, the improvement of planetary and satellite ephemerides, as well as gravity field parameters and other geodetic properties of interest, and estimations of interplanetary plasma properties. This paper presents the implementation of PRIDE as a component of the ESA’s Jupiter Icy Moons Explorer (JUICE) mission.","Doppler tracking; State vector determination; VLBI","en","review","","","","","","","","2024-06-03","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:cd18c56d-d2f7-41b6-9582-f65b8b9362dc","http://resolver.tudelft.nl/uuid:cd18c56d-d2f7-41b6-9582-f65b8b9362dc","Taming complexity of industrial printing systems using a constraint-based DSL: An industrial experience report","Denkers, J. (TU Delft Programming Languages); Brunner, Marvin (Canon Production Printing); van Gool, Louis (Canon Production Printing); Vinju, Jurgen J. (Centrum Wiskunde & Informatica (CWI); Eindhoven University of Technology); Zaidman, A.E. (TU Delft Software Engineering); Visser, Eelco (TU Delft Programming Languages)","","2023","Flexible printing systems are highly complex systems that consist of printers, that print individual sheets of paper, and finishing equipment, that processes sheets after printing, for example, assembling a book. Integrating finishing equipment with printers involves the development of control software that configures the devices, taking hardware constraints into account. This control software is highly complex to realize due to (1) the intertwined nature of printing and finishing, (2) the large variety of print products and production options for a given product, and (3) the large range of finishers produced by different vendors. We have developed a domain-specific language called CSX that offers an interface to constraint solving specific to the printing domain. We use it to model printing and finishing devices and to automatically derive constraint solver-based environments for automatic configuration. We evaluate CSX on its coverage of the printing domain in an industrial context, and we report on lessons learned on using a constraint-based DSL in an industrial context.","constraint programming; digital printing systems; domain-specific languages; industrial experiences","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:ecace56f-01db-4b66-8397-be9829c2c81b","http://resolver.tudelft.nl/uuid:ecace56f-01db-4b66-8397-be9829c2c81b","Experimental evaluation of a solid oxide fuel cell system exposed to inclinations and accelerations by ship motions","van Veldhuizen, B.N. (TU Delft Ship Design, Production and Operations); Zera, E. (SolydEra S.p.A.); van Biert, L. (TU Delft Ship Design, Production and Operations); Modena, S. (SolydEra S.p.A.); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (TU Delft Energy Technology; Rijksuniversiteit Groningen)","","2023","Solid Oxide Fuel Cell (SOFC) systems have the potential to reduce emissions from seagoing vessels. However, it is unknown whether ship motions influence the system's operation. In this research, a 1.5 kW SOFC module is operated on an inclination platform that emulates ship motions, to evaluate the influence of static and dynamic inclinations on the system's safety, operation, and lifetime. The test campaign consists of a static inclination test, a dynamic test, a degradation test, and a high acceleration test. There were no interruptions in the power supply during the different tests, and no detectable gas leakages or safety hazards. Although the SOFC does not fail in any test condition, dynamic inclinations result in forced oscillations in the fuel regulation, which propagate through the system by different feedback loops in the control architecture, leading to significant deviations in the operational parameters of the system. Additionally, for motion periods from 16 to 26 s, reoccurring exceedance of the fuel utilisation results in a gradual reduction of the power supply. Several enhancements are recommended to improve the design of SOFCs and marine fuel cell regulations to ensure their safe operation on ships.","Acceleration; Inclinations; Solid oxide fuel cell; Sustainable shipping; System testing","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:1d6b2af2-166d-4fd7-a139-7a960f722545","http://resolver.tudelft.nl/uuid:1d6b2af2-166d-4fd7-a139-7a960f722545","Corridor Scale Planning of Bunker Infrastructure for Zero-Emission Energy Sources in Inland Waterway Transport","Jiang, M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Baart, F. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares); Visser, K. (TU Delft Ship Design, Production and Operations); Hekkenberg, R.G. (TU Delft Ship Design, Production and Operations); van Koningsveld, M. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Van Oord Dredging and Marine Contractors B.V.)","Li, Yun (editor); Hu, Yaan (editor); Rigo, Philippe (editor); Lefler, Francisco Esteban (editor); Zhao, Gensheng (editor)","2023","The availability of supporting bunker infrastructure for zero-emission energy sources will be key to accommodate zero-emission inland waterway transport (IWT). However, it remains unclear which (mix of) zero-emission energy sources to prepare for, and how to plan the bunker infrastructure in relative positions and required capacity at corridor scale. To provide insight into the positioning and dimensions of bunkering infrastructure we propose a bottom-up energy consumption method combined with agent based network simulation. In the method, we first produce a two-way traffic energy consumption map, aggregated from the energy footprint of individual vessels on the transport network. Next we investigate the potential sailing range of the vessels on the network if they would sail the same routes, but with alternative energy carriers. Based on the sailing range of the vessels for different energy carriers, the maximum inter-distance between refuelling points can be estimated. By aggregating the energy consumptions of all the vessels on the network, we can estimate the required capacity of a given refuelling point. To demonstrate the basic functionality we implement the method to four representative corridor scale inland shipping examples using zero-emission energy sources including hydrogen, batteries, e-NH3, e-methanol and e-LNG. The application in this paper is limited to four abstract cases. A recommended next step is to apply this approach to a more realistic network.","Inland waterway transport; Zero-emission; Bunkering infrastructure; Sustainable energy sources; Energy consumption","en","conference paper","Springer","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:31e29e24-839a-4f14-b558-7e8ddc3e8269","http://resolver.tudelft.nl/uuid:31e29e24-839a-4f14-b558-7e8ddc3e8269","Increasing the sustainable consumption of mainstream consumers: through design and communication","Visser, Mirjam (TU Delft Marketing and Consumer Research)","Schoormans, J.P.L. (promotor); Hultink, H.J. (copromotor); Delft University of Technology (degree granting institution)","2022","This thesis explores why some consumers buy sustainable options and others do not. As well as how this can be altered through targeted marketing communication and design. Sustainable intent is no guarantee for sustainable behaviour, but sustainable intent is also not a necessity for sustainable behaviour. It is the sustainable behaviour that counts. The reasons consumers buy energy-efficient vacuum cleaners makes this clear. Three out of four buyers of energy-efficient vacuum models did buy an energy-efficient vacuum cleaner for other reasons than environmental friendliness. They bought their energy efficient vacuum cleaner for the exact same reasons as those who bought an inefficient model. For neither shoes nor vacuum cleaners, sustainability is a primary buying criteria. On the contrary, there is a bias that sustainability comes at the cost of perceived quality, fashion image or performance. Only when all the main buying criteria are met, sustainability adds differentiation and value. This counts for both “feel” products (such as shoes and clothing) or “think” utilities (such as household appliances and utilities). The highest willingness to buy the sustainable shoe has been reported when the communicated benefit was on personal relevance combined with a green design.
Sustainability and the environmental impact of a product is, for most consumers, abstract and distal. More abstract than the present need which will be solved with the new acquisition. It is also hard, if not impossible, for a layman to compare the environmental costs of product alternatives. Results of comparisons are often context dependent and counter intuitive, which may reduce green trust. To make sustainable products attractive to mainstream consumers, it is necessary, like in mainstream marketing, to focus communication and design on the consumers’ main buying criteria. Deliver sustainability but focus the products’ message and design on the general relevance and needs of the customer or user. Communicating sustainable products is most effective when personal benefits are combined with a linked sustainable benefit such as a health or energy cost reduction. Presenting the energy-efficiency of appliances as a result of broader technological advantages is more effective in creating sustainable purchases than emphasising the communication on the products’ environmental friendliness.
Design should and can counter the bias and negative performance perceptions of sustainability. Consumers perceive the smaller energy-efficient motors in appliances often as less robust and powerful than energy-inefficient ones. Design can counter this perceived underperformance of sustainability with additional volume and weight which both have only a minor effect on the environmental cost. Sustainable utilities should perform as well and still look robust and powerful as less sustainable variants. Sustainable shoes without leather should be also just as comfortable, breathable and fashionable.
Unfortunately, the study after recommendations of buyers of sustainable vacuum cleaners showed sustainable buyers are less positive in their recommendations compared to those who bought unsustainable versions. This makes owners of energy-efficient appliances ineffective in promoting sustainable alternatives, increasing green trust or changing social norms. Differences in satisfaction ratings are not caused by the differences in the energy efficiency of the products but by the differences in the products’ perceived performance, ease of use and value for money. These are all independent of the input power of vacuum cleaners. Additionally, irrespective of the energy efficiency of the vacuum cleaners, higher suction power and increased weight positively mediate the recommendations. Focusing design and communication on these aspects rather than on energy efficiency alone can reduce the perceived green risk and increase green trust in sustainable products.
For energy consuming durables, often the largest part of their environmental cost is realised during the use phase. Eco-design legislation to increase the energy efficiency of appliances and cars prescribes the use of eco-settings to reduce energy consumption. Most of the eco-settings usage is optional and, in most cases, defaults to the unsustainable settings after they are switched off. The washing machine study shows only a few percentages of the theoretical energy savings from the eco-setting being realised. The focus of legislators has not been on user behaviour and the effectivity of these energy efficiency measures. The washing machine study shows energy inefficient users consume three times as much energy as energy efficient users (Chapter 5). The comparison of different design for sustainable behaviour interventions showed elimination of the unsustainable settings, combined with feedback on energy consumption to be far more effective in reducing energy consumption. Design interventions are cost efficient to implement and an effective addition to the technological innovations in motor adaptions and insulations. Feedback also teaches new behaviour.
Sustainability should be implicit and not explicit if it is not relevant for the products’ performance or image. By focusing design and communication on consumer relevance and behaviour, this thesis highlights that it is possible to increase sustainable consumption among mainstream consumers.
2 due to neurosurgical implantation constraints. A transmission range up to 10cm is highly desirable, in order to improve the reliability of the wireless link against e.g., antenna misalignment, etc. Finally, the power consumption of the wireless telemetry should be limited to ~10mW to minimize thermal flux from the module's surface area, avoiding excessive tissue heating. Most of the conventional transcutaneous wireless telemetry systems adopt inductive coupling, but the data-rate is limited to a few Mb/s. A near-infrared (NIR) optical transcutaneous TX using a vertical-cavity-surface-emitting laser (VCSEL) [2] demonstrated a data-rate up to 300Mb/s but suffers from a limited transmission range (4mm) and requires a sub-mm precise alignment between the implant TX and a wearable RX. Impulse-radio UWB (IR-UWB) is promising for the targeted requirements [3]–[5].","Wireless communication; Wireless sensor networks; Power demand; Transmitting antennas; Scalp; Brain-computer interfaces; Telemetry","en","conference paper","IEEE","","","","","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","","","Electronics","","",""
"uuid:2a82b62d-f9d1-4867-9ac2-ffcdc7a64e64","http://resolver.tudelft.nl/uuid:2a82b62d-f9d1-4867-9ac2-ffcdc7a64e64","Operational data-driven energy performance assessment of ships: the case study of a naval vessel with hybrid propulsion","Vasilikis, N. (TU Delft Ship Design, Production and Operations); Geertsma, R.D. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Visser, K. (TU Delft Ship Design, Production and Operations)","","2022","Ship designers hardly ever receive feedback from the actual operation of their designs apart from sea acceptance trials. Similarly, crews operating the vessels do not receive a clear picture of the energy performance and environmental footprint of different options. This paper proposes a methodology based on operational data from continuous monitoring, and applies it to an ocean patrol vessel of the Royal Netherlands Navy in order to identify the impact of diverse operational conditions on energy performance over the whole operating range, but also to examine the decision to equip the vessel with hybrid propulsion. Specifically, it introduces mean energy effectiveness indicator and mean total energy efficiency over discretised vessel speed, as the main tool in quantifying the energy gains and losses to assist in making better-advised design and operational decisions. Moreover, it demonstrates a dataset enrichment procedure, using manufacturers' information, in case not all needed sensors are available. Results suggest that electrical propulsion was 15–25% less efficient than the best mechanical propulsion mode, and on the overall energy performance of the vessel, increasing speed by 1 knot caused a 7% and 14% increase over the minimum (Formula presented.) /mile emissions between 8 and 14, and above 14 knots respectively.","CII; data analysis; EEDI; EEOI; EEXI; hybrid propulsion; KPI; maritime","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:f86c5075-bdf4-4b89-aab7-44c09cc5517b","http://resolver.tudelft.nl/uuid:f86c5075-bdf4-4b89-aab7-44c09cc5517b","Exoplanet cartography using convolutional neural networks","Meinke, K. (Student TU Delft); Stam, D.M. (TU Delft Astrodynamics & Space Missions); Visser, P.M. (TU Delft Mathematical Physics)","","2022","Context. In the near future, dedicated telescopes will observe Earth-like exoplanets in reflected parent starlight, allowing their physical characterization. Because of the huge distances, every exoplanet will remain an unresolved, single pixel, but temporal variations in the pixel’s spectral flux contain information about the planet’s surface and atmosphere.
Aims. We tested convolutional neural networks for retrieving a planet’s rotation axis, surface, and cloud map from simulated single-pixel observations of flux and polarization light curves. We investigated the influence of assuming that the reflection by the planets is Lambertian in the retrieval while in reality their reflection is bidirectional, and the influence of including polarization.
Methods. We simulated observations along a planet’s orbit using a radiative transfer algorithm that includes polarization and bidirectional reflection by vegetation, deserts, oceans, water clouds, and Rayleigh scattering in six spectral bands from 400 to 800 nm, at various levels of photon noise. The surface types and cloud patterns of the facets covering a model planet are based on probability distributions. Our networks were trained with simulated observations of millions of planets before retrieving maps of test planets.
Results. The neural networks can constrain rotation axes with a mean squared error (MSE) as small as 0.0097, depending on the orbital inclination. On a bidirectionally reflecting planet, 92% of ocean facets and 85% of vegetation, deserts, and cloud facets are correctly retrieved, in the absence of noise. With realistic amounts of noise, it should still be possible to retrieve the main map features with a dedicated telescope. Except for face-on orbits, a network trained with Lambertian reflecting planets yields significant retrieval errors when given observations of bidirectionally reflecting planets, in particular, brightness artifacts around a planet’s pole. Including polarization improves the retrieval of the rotation axis and the accuracy of the retrieval of ocean and cloudy map facets.","planets and satellites: surfaces; planets and satellites: oceans; planets and satellites: atmospheres; techniques: photometric; techniques: polarimetric / techniques: image processing","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:8fc54825-0e94-4c83-a443-15c5d36360aa","http://resolver.tudelft.nl/uuid:8fc54825-0e94-4c83-a443-15c5d36360aa","A New Model for the Planetary Radiation Pressure Acceleration for Solar Sails","Carzana, L. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering); Heiligers, M.J. (TU Delft Astrodynamics & Space Missions)","","2022","Solar sailing is a propellantless propulsion method that takes advantage of solar
radiation pressure to generate thrust. The last decades have seen the launch of
several solar-sail missions to demonstrate the technology’s potential for space
exploration and exploitation. Even more missions are scheduled for launch in
the near future, including NASA’s ACS3 and NEA Scout missions and Gama’s
Alpha sailcraft. Although most of these sailcraft have flown – or will fly – in
LEO, where the planetary radiation pressure is strong (up to approximately 20%
of the solar radiation pressure), studies on the perturbing accelerations produced
by the Earth’s albedo and blackbody radiation have been conducted only to a
very limited first-order extent. This paper therefore provides a novel, detailed
analytical model for these perturbing accelerations, valid for double-sided perfectly
reflecting solar sails. The underlying assumptions of the model are presented
and its full derivation is described. A thorough analysis of the blackbody
and albedo radiation pressure accelerations is conducted for a variety of orbital
conditions and Sun-Earth-sail configurations. In order to quantify the accuracy
of the model, a comparison with the state of the art (the finite-disk radiation
source model) is provided. Ultimately, a variety of analyses to quantify the effect
of Earth’s albedo and blackbody radiation on the maneuvering capabilities
of solar sails are provided, using the orbit of the ACS3 mission as reference scenario.
These analyses show that, for an orbit-raising steering law, losses in the
altitude gain of 19.6% of the total gain are incurred over a 10-day orbit-raising
period. Similarly, losses in the inclination gain of up to 25% of the total gain are
observed when implementing an inclination-changing steering law. These results
highlight the non-negligible effect of uncontrolled planetary radiation pressure
acceleration on the maneuvering capabilities of solar sails in LEO.","","en","conference paper","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:01955ba2-a841-49e8-bb5d-a6c9c5262514","http://resolver.tudelft.nl/uuid:01955ba2-a841-49e8-bb5d-a6c9c5262514","The Faculty of Aerospace Engineering at Delft University of Technology","De Breuker, R. (TU Delft Aerospace Structures & Computational Mechanics); Benedictus, R. (TU Delft Structural Integrity & Composites); Bisagni, C. (TU Delft Aerospace Structures & Computational Mechanics); Boneschansker, I. (TU Delft Communication LR); Melkert, J.A. (TU Delft Flight Performance and Propulsion); Snellen, M. (TU Delft Control & Operations; TU Delft Aircraft Noise and Climate Effects); Veldhuis, L.L.M. (TU Delft Flow Physics and Technology; TU Delft Flight Performance and Propulsion); Verdegaal, F.M. (TU Delft Support Aerospace Engineering); Visser, P.N.A.M. (TU Delft Space Engineering; TU Delft Space Systems Egineering); Werij, H.G.C. (TU Delft Aerospace Engineering)","","2022","The Faculty of Aerospace Engineering is one of eight faculties at Delft University of Technology. It is one of the most comprehensive academic and innovation communities worldwide focusing on aerospace engineering. Its 120 professors and 70 researchers are mentoring and teaching around 2,800 BSc/MSc students and more than 350 PhD candidates while working in all aerospace disciplines. It’s a powerhouse in aerospace education, research, and innovation, within the top 10 in the world. Our priority themes? Sustainable aerospace, digital transformation, including Artificial Intelligence, bio-inspired engineering and smart instruments and systems. Here’s our story.","TU Delft; aerospace","en","journal article","","","","","","","","","Aerospace Engineering","Control & Operations","Aerospace Structures & Computational Mechanics","","",""
"uuid:123137a6-11ca-4a84-ba36-4d60e8aa307d","http://resolver.tudelft.nl/uuid:123137a6-11ca-4a84-ba36-4d60e8aa307d","Challenges in Applying Continuous Experimentation: A Practitioners' Perspective","Anderson, K.S. (TU Delft Software Engineering; Vista); Visser, Denise (Bol.com); Mannen, Jan-Willem (ING); Jiang, Yuxiang (Student TU Delft); van Deursen, A. (TU Delft Software Technology)","","2022","Background: Applying Continuous Experimentation on a large scale is not easily achieved. Although the evolution within large tech organisations is well understood, we still lack a good understanding of how to transition a company towards applying more experiments. Objective: This study investigates how practitioners define, value and apply experimentation, the blockers they experience and what to do to solve these. Method: We interviewed and surveyed over one hundred practitioners with regards to experimentation perspectives, from a large financial services and e-commerce organization, based in the Netherlands. Results: Many practitioners have different perspectives on experimentation. The value is well understood. We have learned that the practitioners are blocked by a lack of priority, experience and well functioning tooling. Challenges also arise around dependencies between teams and evaluating experiments with the correct metrics. Conclusions: Organisation leaders need to start asking for experiment results and investing in infrastructure and processes to actually enable teams to execute experiments and show the value of their work in terms of value for customers and business.","Continuous experimentation; Online controlled experiments; A/B testing; Empirical software engineering; ING; bol.com","en","conference paper","IEEE","","","","","","","","","Software Technology","Software Engineering","","",""
"uuid:a5b056bb-c633-4195-acac-b9a35e2c5387","http://resolver.tudelft.nl/uuid:a5b056bb-c633-4195-acac-b9a35e2c5387","Language-parametric static semantic code completion","Pelsmaeker, D.A.A. (TU Delft Programming Languages); van Antwerpen, H. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2022","Code completion is an editor service in IDEs that proposes code fragments for the user to insert at the caret position in their code. Code completion should be sound and complete. It should be sound, such that it only proposes fragments that do not violate the syntactic and static semantic rules of the language. It should be complete, such that it proposes all valid fragments so that code completion can be used to construct all programs. To realize soundness and completeness, code completion should be informed by the language definition. In practice, the implementation of code completion is an additional effort in the implementation of a language.
In this paper, we develop a framework for language-parametric semantic code completion for statically typed programming languages based on their specification of syntax and static semantics, realizing the implementation of a code completion editor service with minimal additional effort. The framework builds on the SDF3 syntax definition formalism and the Statix static semantics specification language. The algorithm reinterprets the static semantics definition to find sound expansions of predicates and solutions to name resolution queries in scope graphs. This allows a search strategy to explore the solution space and synthesize completion proposals. The implementation of the strategy language and code completion algorithm extend the implementation of the Statix solver, and can be used for any language defined in Statix. We demonstrate soundness and completeness of the completion proposal synthesis, and evaluate its performance.","","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:e668432d-3881-4e19-9862-36f0d4b42226","http://resolver.tudelft.nl/uuid:e668432d-3881-4e19-9862-36f0d4b42226","Incremental Type-Checking for Free: Using Scope Graphs to Derive Incremental Type-Checkers","Zwaan, A.S. (TU Delft Programming Languages); van Antwerpen, H. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2022","Fast analysis response times in IDEs are essential for a good editor experience. Incremental type-checking can provide that in a scalable fashion. However, existing techniques are not reusable between languages. Moreover, mutual and dynamic dependencies preclude traditional approaches to incrementality. This makes finding automatic approaches to incremental type-checking a challenging but important open question.
In this paper, we present a technique that automatically derives incremental type-checkers from type system specifications written in the Statix meta-DSL. We use name resolution queries in scope graphs (a generic model of name binding embedded in Statix) to derive dependencies between compilation units. A novel query confirmation algorithm finds queries for which the answer changed due to an edit in the program. Only units with such queries require reanalysis. The effectiveness of this algorithm is improved by (1) splitting the type-checking task into a context-free and a context-sensitive part, and (2) reusing a generic mechanism to resolve mutual dependencies. This automatically yields incremental type-checkers for any Statix specification.
Compared to non-incremental parallel execution, we achieve speedups up to 147x on synthetic benchmarks, and up to 21x on real-world projects, with initial overheads below 10%. This suggests that our framework can provide efficient incremental type-checking to the wide range of languages supported by Statix.","type-checker; incremental type-checking; scope graphs; type systems; name binding; reference resolution; Statix","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:cf6b7014-0874-496f-99b3-e8b192c7e51c","http://resolver.tudelft.nl/uuid:cf6b7014-0874-496f-99b3-e8b192c7e51c","Effective Naval Power Plant Design Space Exploration","de Vos, P. (TU Delft Ship Design, Production and Operations); de van der Schueren, T.A.R. (Pon Power Nederland); Los, S. (Nevesbu); Visser, K. (TU Delft Ship Design, Production and Operations)","","2022","In this paper a Concept Exploration Tool (CET) for naval ship power plants is presented. The ideas behind the CET are introduced as well as the inner workings of the tool. Objective functions for different relevant design criteria (energy efficiency, emissions, signatures, etc.) are shortly discussed, after which the results for a Frigate case study will be shown. Interesting solutions that are outside the well-known zone of conventional configurations, that may lead to new insights and innovative designs, are amongst the results of the CET; demonstrating the advantages of Design Space Exploration. The main development of this CET compared to earlier versions is however in the computational effectiveness of the tool, which is amongst others made possible by so-called Intermediate Design Algorithms (IDeAs). The major improvement in computational time provides additional room for further development of the objective functions used.","Concept Exploration; Early-stage Design; Naval Power Plants (Power & Propulsion System)","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:8c65078d-1c1c-4cbb-a461-f8cf83b61887","http://resolver.tudelft.nl/uuid:8c65078d-1c1c-4cbb-a461-f8cf83b61887","Comparative analysis of alternative fuels for marine SOFC systems","van Veldhuizen, B.N. (TU Delft Ship Design, Production and Operations); van Biert, L. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Hopman, J.J. (TU Delft Ship Design, Production and Operations)","Vladimir, Nikola (editor); Malenica, Sime (editor); Senjanovic, Ivo (editor)","2022","To continue its operations, the marine industry needs to comply with emission regulations. Solid Oxide Fuel Cells (SOFCs) are considered a promising solution, since it can generate energy athigh efficiency and low NOX, SOX and particulate matter emissions. Another advantage of SOFCsis fuel flexibility, meaning several fuels can be applied in SOFC systems. This brings up the question which fuel is most effective for a marine SOFC system. In this research, marine gas oil (benchmark), liquefied hydrogen, biodiesel, Fischer-Tropsch diesel, natural gas, methanol, dimethyl ether, and hydrogenare compared as bunker fuel. A comparison framework is proposed specialised for marine applications. The following decision criteria are selected: production capacity, volumetric/ gravimetric energy density, technological readiness, safety, fuel cost, cost of the fuel storage system, and emissions. The performance indicators are quantified for every fuel based on literature and supplier information.In the end, five alternative fuels are selected for marine SOFC systems on the selected criteria, which wille be used in further research.","Marine fuels; Power generation; SOFC; Emissions","en","conference paper","University of Zagreb","","","","","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","","","Ship Design, Production and Operations","","",""
"uuid:c950f39c-0f4c-43a0-bd01-ddb523303968","http://resolver.tudelft.nl/uuid:c950f39c-0f4c-43a0-bd01-ddb523303968","A review of the potential of hydrogen carriers for zero emission, low signature ship propulsion systems","Van Rheenen, E.S. (TU Delft Ship Design, Production and Operations); Padding, J.T. (TU Delft Complex Fluid Processing); Slootweg, J.C. (Universiteit van Amsterdam); Visser, K. (TU Delft Ship Design, Production and Operations)","","2022","Increasing pressure on the reduction or elimination of the use of fossil fuels in shipping requires the application of new maritime fuel alternatives. Green and circular produced hydrogen as a maritime fuel in fuel cell systems offers a great solution for these concerns. A fuel cell system has a zero emission performance, solid state silent process cycle, graceful degradation and no single point of failure. From a naval perspective, these characteristics very much support operational requirements like a silent propulsion and very low thermal and acoustic signatures as well as the possibility of an air independent system. Storage of hydrogen, however, is an issue. Traditional hydrogen storage in gas or liquefied aggregation has low volumetric density, low flame point, fire and explosion risks and transport challenges. The aim of this literature review is to investigate several hydrogen carriers and evaluate their characteristics on maritime and naval performance. This includes their volumetric and gravimetric density, dehydrogenation process, safety, logistic availability and handling. Over 15 different (types of) hydrogen carriers have been researched. Borohydrides, specifically sodium borohydride appeared to have several advantages, but still has issues with its hydrogenation process and handling due to it being a solid. The liquid organic hydrogen carrier dibenzyl toluene, on the other hand, does not meet the required energy density, but does have favourable additional properties, such as easy hydrogenation and good handling. Both of these are also subject of current research and development: For example, Hydrogenious LOHC Maritime AS, in combination with �stensj? Rederi, is working on a megawatt application for maritime, which should be finished in 2025. The Dutch government funds the SH2IPDRIVE project and the European Interreg North West Europe organization funds the H2SHIPS research project to analyse the shipboard use of these hydrogen carriers and to establish the design and engineering optimization opportunities.","Hydrogen; hydrogen carriers; Solid hydrogen carriers; Liquid hydrogen carriers; Maritime transportation","en","conference paper","IMarEST","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:5b495a9f-d088-497a-a98d-d052d203f82f","http://resolver.tudelft.nl/uuid:5b495a9f-d088-497a-a98d-d052d203f82f","Differential Diagnosis and Molecular Stratification of Gastrointestinal Stromal Tumors on CT Images Using a Radiomics Approach","Starmans, Martijn P.A. (Erasmus MC); Timbergen, Milea J.M. (Erasmus MC); Vos, Melissa (Erasmus MC); Renckens, Michel (Erasmus MC); Grünhagen, Dirk J. (Erasmus MC); van Leenders, Geert J.L.H. (Erasmus MC); Niessen, W.J. (TU Delft ImPhys/Medical Imaging; TU Delft ImPhys/Computational Imaging; Erasmus MC); Visser, Jacob J. (Erasmus MC); Klein, Stefan (Erasmus MC)","","2022","Treatment planning of gastrointestinal stromal tumors (GISTs) includes distinguishing GISTs from other intra-abdominal tumors and GISTs’ molecular analysis. The aim of this study was to evaluate radiomics for distinguishing GISTs from other intra-abdominal tumors, and in GISTs, predict the c-KIT, PDGFRA, BRAF mutational status, and mitotic index (MI). Patients diagnosed at the Erasmus MC between 2004 and 2017, with GIST or non-GIST intra-abdominal tumors and a contrast-enhanced venous-phase CT, were retrospectively included. Tumors were segmented, from which 564 image features were extracted. Prediction models were constructed using a combination of machine learning approaches. The evaluation was performed in a 100 × random-split cross-validation. Model performance was compared to that of three radiologists. One hundred twenty-five GISTs and 122 non-GISTs were included. The GIST vs. non-GIST radiomics model had a mean area under the curve (AUC) of 0.77. Three radiologists had an AUC of 0.69, 0.76, and 0.84, respectively. The radiomics model had an AUC of 0.52 for c-KIT, 0.56 for c-KIT exon 11, and 0.52 for the MI. The numbers of PDGFRA, BRAF, and other c-KIT mutations were too low for analysis. Our radiomics model was able to distinguish GISTs from non-GISTs with a performance similar to three radiologists, but less observer dependent. Therefore, it may aid in the early diagnosis of GIST, facilitating rapid referral to specialized treatment centers. As the model was not able to predict any genetic or molecular features, it cannot aid in treatment planning yet.","Gastrointestinal stromal tumors; Machine learning; Radiomics; Sarcoma; Tomography; X-ray computed","en","journal article","","","","","","","","","","","ImPhys/Medical Imaging","","",""
"uuid:74818156-4a25-4617-9fef-800043334f22","http://resolver.tudelft.nl/uuid:74818156-4a25-4617-9fef-800043334f22","An operational bidding framework for aggregated electric vehicles on the electricity spot market","Visser, L. R. (Universiteit Utrecht); Kootte, M.E. (TU Delft Numerical Analysis); Ferreira, A. C. (Universiteit van Amsterdam); Sicurani, O. (Sympower); Pauwels, E. J. (Centrum Wiskunde & Informatica (CWI)); Vuik, Cornelis (TU Delft Numerical Analysis); Van Sark, W. G.J.H.M. (Universiteit Utrecht); AlSkaif, T. A. (Wageningen University & Research)","","2022","Fluctuating electricity prices offer potential economic savings for the consumption of electricity by flexible assets such as Electric Vehicles (EVs). This study proposes an operational bidding framework that minimizes the charging costs of an EV fleet by submitting an optimized bid to the day-ahead electricity market. The framework consists of a bidding module that determines the most cost-effective bid by considering an electricity price and an EV charging demand forecast module. In this study we develop and evaluate several regression and machine learning models that forecast the electricity price and EV charging demand. Furthermore, we examine the composition of a most optimal operational bidding framework by comparing the outcome of the bidding module when fed with each of the forecast models. This is determined by considering the day-ahead electricity price and imbalance costs due to forecast errors. The study demonstrates that the best performing self-contained forecast models with the objective of electricity price and EV charging demand forecasting, do not deliver the best overall results when included in the bidding framework. Additionally, the results show that the best performing framework obtains a 26% cost savings compared to a reference case where EVs are charged inflexibly. This corresponds to an achieved savings potential of 92%. Consequently, along with the developed bidding framework, these results provide a fundamental basis for effective electricity trading on the day-ahead market.","Day ahead electricity market; Electric Vehicles; Forecast; Machine learning; Market trading; Operational bidding framework; Smart charging","en","journal article","","","","","","","","","","","Numerical Analysis","","",""
"uuid:bece3a70-3e53-43a5-b51a-50904a243c41","http://resolver.tudelft.nl/uuid:bece3a70-3e53-43a5-b51a-50904a243c41","Mean value first principle engine model for predicting dynamic behaviour of two-stroke marine diesel engine in various ship propulsion operations","Sui, Congbiao (TU Delft Ship Design, Production and Operations; Harbin Engineering University); de Vos, P. (TU Delft Ship Design, Production and Operations); Stapersma, D. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Hopman, J.J. (TU Delft Ship Design, Production and Operations); Ding, Yu (Harbin Engineering University)","","2022","Analysis of ship propulsion system performance is often performed using detailed hydrodynamic models to assess load changes, which are subsequently compared to static engine limits, or by detailed engine models that are rarely integrated with sufficiently detailed propulsion models for load change estimation. To investigate the dynamic engine (overloading) behaviour and ship propulsion performance under various heavy operating conditions, a Mean Value First Principle Parametric (MVFPP) engine model is integrated into a ship propulsion system model in this paper. An upgraded thermodynamic-based MVFPP model for two-stroke marine diesel engines is presented, in particular a newly developed MVFPP gas exchange model. Based on the integrated propulsion system model of a benchmark ocean-going chemical tanker, the engine dynamic behaviour during ship acceleration, deceleration and crash stop has been investigated. Results show that, during dynamic processes, the engine could be thermally overloaded even if the engine power trajectory is inside the static engine operating envelope. The paper contributes to finding proper indicators for thermal overloading of modern two-stroke marine diesel engines. It is demonstrated that when matching the engine with the propeller and designing the ship propulsion control system, not only the static engine operating envelope, but also the dynamic engine behaviour should be considered.","1D ship propulsion system model; Engine dynamic performance; Thermal loading; Two-stroke marine diesel engine mean value first principle model; Two-zone scavenge model","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:d6f3cef3-d3c7-4de2-abdb-89f0ab249bd9","http://resolver.tudelft.nl/uuid:d6f3cef3-d3c7-4de2-abdb-89f0ab249bd9","CASPA-ADM: a mission concept for observing thermospheric mass density","Siemes, C. (TU Delft Astrodynamics & Space Missions); Maddox, Stephen (Teledyne e2v, Chelmsford); Carraz, Olivier (European Space Agency (ESA)); Cross, Trevor (Teledyne e2v, Chelmsford); George, Steven (RAL Space, Harwell); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Kiss-Toth, Marton (Teledyne e2v, Chelmsford); Pastena, Massimiliano (European Space Agency (ESA)); Visser, P.N.A.M. (TU Delft Space Engineering)","","2022","Cold Atom technology has undergone rapid development in recent years and has been demonstrated in space in the form of cold atom scientific experiments and technology demonstrators, but has so far not been used as the fundamental sensor technology in a science mission. The European Space Agency therefore funded a 7-month project to define the CASPA-ADM mission concept, which serves to demonstrate cold-atom interferometer (CAI) accelerometer technology in space. To make the mission concept useful beyond the technology demonstration, it aims at providing observations of thermosphere mass density in the altitude region of 300–400 km, which is presently not well covered with observations by other missions. The goal for the accuracy of the thermosphere density observations is 1% of the signal, which will enable the study of gas–surface interactions as well as the observation of atmospheric waves. To reach this accuracy, the CAI accelerometer is complemented with a neutral mass spectrometer, ram wind sensor, and a star sensor. The neutral mass spectrometer data is considered valuable on its own since the last measurements of atmospheric composition and temperature in the targeted altitude range date back to 1980s. A multi-frequency GNSS receiver provides not only precise positions, but also thermosphere density observations with a lower resolution along the orbit, which can be used to validate the CAI accelerometer measurements. In this paper, we provide an overview of the mission concept and its objectives, the orbit selection, and derive first requirements for the scientific payload.","Accelerometry; Cold-atom interferometry; Gas–surface interactions; Mass density; Mission design; Neutral winds; Thermosphere","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:1541ff0e-a63d-4738-8bf2-7694fdefe400","http://resolver.tudelft.nl/uuid:1541ff0e-a63d-4738-8bf2-7694fdefe400","Effects of adverse sea conditions on propulsion and manoeuvring performance of low-powered ocean-going cargo ship","Sui, Congbiao (TU Delft Ship Design, Production and Operations; Harbin Engineering University); de Vos, P. (TU Delft Ship Design, Production and Operations); Hopman, J.J. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Stapersma, D. (TU Delft Ship Design, Production and Operations); Ding, Yu (Harbin Engineering University)","","2022","Current EEDI (Energy Efficiency Design Index) regulations striving to reduce the installed engine power on new ships for a low EEDI may lead to underpowered ships having insufficient power when operating in adverse sea conditions. In this paper, the operational safety of a low-powered ocean-going cargo ship operating in adverse sea conditions has been investigated using an integrated ship propulsion, manoeuvring and sea state model. The ship propulsion and manoeuvring performance, especially the dynamic engine behaviour, when the ship is sailing in heavy weather and turning into head sea, have been studied. According to the results, the dynamic engine behaviour should be considered when assessing the ship operational safety, as the static engine operating envelope is inadequate for the safety assessment. The impact of PTO/PTI (power-take-off/in) operation and changing propeller pitch on the ship thrust availability in adverse sea conditions have also been investigated. To protect the engine from mechanical and thermal overloading, compressor surge and over-speeding during dynamic ship operations and/or in high sea states, the engine and propeller should be carefully controlled. The paper shows that if in (heavy) adverse weather the propeller pitch can be reduced or if the shaft generator can work as a motor (PTI), more thrust can be developed which can significantly improve the operational safety of the ship.","Adverse sea; Engine dynamic performance; Low-powered ship; Minimum propulsion power; Ship operational safety","en","journal article","","","","","","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","","","Ship Design, Production and Operations","","",""
"uuid:ce490610-1628-4c1e-8942-5106152b9566","http://resolver.tudelft.nl/uuid:ce490610-1628-4c1e-8942-5106152b9566","A machine learning approach for propeller design and optimization: Part II","Doijode, P.S. (TU Delft Ship Design, Production and Operations); Hickel, S. (TU Delft Aerodynamics); van Terwisga, T.J.C. (TU Delft Ship Hydromechanics and Structures; Maritime Research Institute Netherlands (MARIN)); Visser, K. (TU Delft Ship Design, Production and Operations)","","2022","We propose and analyse an optimization method that uses a machine learning approach to solve multi-objective, constrained propeller optimization problems. The method uses an online learning strategy where explainable supervised classifiers learn the location of the Pareto front and advise search strategies. The classifiers are trained with orthogonal features that capture geometric variation in radial distribution of pitch, skew, camber and chordlength. Based on orthogonal features, the classifiers predict whether or not a design lies on the Pareto front. If the design is predicted to lie on the Pareto front, the method verifies this with an evaluation. If the design is predicted to not lie on the Pareto front with a high confidence level, then the design is ignored. This skipped evaluation reduces the computational effort of optimization. The method is demonstrated on a cavitating, unsteady flow case of the Wageningen B-4 70 propeller with P/D = 1.0 operating in the Seiun-Maru wake. Compared to the classical Non-dominated Sorting Genetic Algorithm — III (NSGA-III) the optimization method is able to reduce 30% of evaluations per generation while reproducing a comparable Pareto front. Trade-offs between suction side, pressure side, tip-vortex cavitation and efficiency are identified from the Pareto front. The non-elitist NSGA-III search algorithm in conjunction with the explainable supervised classifiers also find very diverse solutions. Among the solutions, a design with no pressure side cavitation, low suction side cavitation and reasonable tip-vortex cavitation is found.","Dynamic optimization; Machine learning; Orthogonal parametric model; Propeller design and optimization; Uncertainty","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:a99ac4bd-cf1d-4957-b04c-f6eaa955e3dc","http://resolver.tudelft.nl/uuid:a99ac4bd-cf1d-4957-b04c-f6eaa955e3dc","Small Size Transition-Edge Sensors for Future X-Ray Applications","Taralli, E. (SRON Netherlands Institute for Space Research); de Wit, M. (SRON Netherlands Institute for Space Research); Gottardi, L. (SRON Netherlands Institute for Space Research); Nagayoshi, K. (SRON Netherlands Institute for Space Research); Visser, S. (SRON Netherlands Institute for Space Research); Ridder, M.L. (SRON Netherlands Institute for Space Research); Akamatsu, H. (SRON Netherlands Institute for Space Research); Vaccaro, D. (SRON Netherlands Institute for Space Research); Gao, J.R. (TU Delft ImPhys/Optics; SRON Netherlands Institute for Space Research)","","2022","Large arrays of transition edge sensors (TESs) are the baseline for a number of future space observatories. For instance, the X-ray integral field unit (X-IFU) instrument on board the ATHENA space telescope will consist of ∼ 3000 TESs with high energy resolution (2eV at X-ray energies up to 7 keV). In this contribution we report on the development of an X-ray TES array as a backup detector technology for X-IFU. The baseline readout technology for this mission is time domain multiplexing where the detectors are DC biased. Specifically, we report on the characterization of four different Ti/Au TESs with the following dimensions (L × W): 30 × 15 , 30 × 30 , 50 × 25 and 50×50μm2, all of which are coupled to a 2.3μm thick Au absorber of area 240×240μm2. We have performed our characterization using our standard frequency domain multiplexing readout connecting only pixels at low frequencies, where nonlinear effects due to the AC biasing are negligible. Promising energy resolution has been obtained, for instance 1.78±0.10eV and 1.75±0.10eV at 5.9 keV for the 50 × 25 and 50×50μm2 detectors respectively. Uniformity over a kilo-pixel array (of detectors with the same geometry) has been also studied, confirming the high quality of our fabrication process.","Critical inductance; Energy resolution; Proximity effect; TES; X-IFU","en","journal article","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:223bdd73-fc91-47c9-8b3d-ffb4c20346ff","http://resolver.tudelft.nl/uuid:223bdd73-fc91-47c9-8b3d-ffb4c20346ff","Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors","Nagayoshi, K. (SRON Netherlands Institute for Space Research); de Wit, M. (SRON Netherlands Institute for Space Research); Taralli, E. (SRON Netherlands Institute for Space Research); Visser, S. (SRON Netherlands Institute for Space Research); Ridder, M. L. (SRON Netherlands Institute for Space Research); Gottardi, L. (SRON Netherlands Institute for Space Research); Akamatsu, H. (SRON Netherlands Institute for Space Research); Vaccaro, D. (SRON Netherlands Institute for Space Research); Gao, J.R. (TU Delft ImPhys/Optics; SRON Netherlands Institute for Space Research)","","2022","We report measured Tc of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the Tc drops as W decreases and the declining trend almost perfectly follows Tc/ [mK] = - 738.4 [μ m] 2/ W2+ 91.0 , where Tc(W= ∞) of 91 mK is consistent with the intrinsic Tc of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The Tc shift from the intrinsic Tc should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.","Athena; Bilayer; Microcalorimeter; Proximity effect; TES; Ti/Au; X-IFU; X-ray","en","journal article","","","","","","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","","","ImPhys/Optics","","",""
"uuid:25855216-5394-47bd-9bca-72dca8b4a154","http://resolver.tudelft.nl/uuid:25855216-5394-47bd-9bca-72dca8b4a154","Result of the MICROSCOPE weak equivalence principle test","Touboul, Pierre (CNRS); Métris, Gilles (Laboratoire Lagrange); Rodrigues, Manuel (CNRS); Bergé, Joel (CNRS); Robert, Alain (CNES Centre National d'Etudes Spatiales); Baghi, Quentin (Laboratoire Lagrange; CNRS); André, Yves (CNES Centre National d'Etudes Spatiales); Bedouet, Judicael (ENSIACET); Visser, P.N.A.M. (TU Delft Space Engineering)","","2022","The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a A and a B) of two test masses in terms of the Eötvös parameter η ( A,B ) = 2 a A − a B a A + a B . No EP violation has been detected for two test masses, made from platinum and titanium alloys, in a sequence of 19 segments lasting from 13 to 198 h down to the limit of the statistical error which is smaller than 10−14 for η(Ti, Pt). Accumulating data from all segments leads to η(Ti, Pt) = [−1.5 ± 2.3 (stat) ± 1.5 (syst)] × 10−15 showing no EP violation at the level of 2.7 × 10−15 if we combine stochastic and systematic errors quadratically. This represents an improvement of almost two orders of magnitude with respect to the previous best such test performed by the Eöt-Wash group. The reliability of this limit has been verified by comparing the free falls of two test masses of the same composition (platinum) leading to a null Eötvös parameter with a statistical uncertainty of 1.1 × 10−15w = 7.5 Palu earthquake (Sulawesi, Indonesia). With a predominantly strike-slip mechanism, the question remains whether this unexpected tsunami was generated by the earthquake itself, or rather by earthquake-induced landslides. In this study we examine the tsunami potential of the co-seismic deformation. To this end, we present a novel geodetic data set of Global Positioning System and multiple Synthetic Aperture Radar-derived displacement fields to estimate a 3D co-seismic surface deformation field. The data reveal a number of fault bends, conforming to our interpretation of the tectonic setting as a transtensional basin. Using a Bayesian framework, we provide robust finite fault solutions of the co-seismic slip distribution, incorporating several scenarios of tectonically feasible fault orientations below the bay. These finite fault scenarios involve large co-seismic uplift (>2 m) below the bay due to thrusting on a restraining fault bend that connects the offshore continuation of two parallel onshore fault segments. With the co-seismic displacement estimates as input we simulate a number of tsunami cases. For most locations for which video-derived tsunami waveforms are available our models provide a qualitative fit to leading wave arrival times and polarity. The modeled tsunamis explain most of the observed runup. We conclude that co-seismic deformation was the main driver behind the tsunami that followed the Palu earthquake. Our unique geodetic data set constrains vertical motions of the sea floor, and sheds new light on the tsunamigenesis of strike-slip faults in transtensional basins.","fault bend; GPS; InSAR; Palu Bay tsunami; Palu earthquake; transtension","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:1370a28a-1e6d-4c9c-aa36-2ee2c6573615","http://resolver.tudelft.nl/uuid:1370a28a-1e6d-4c9c-aa36-2ee2c6573615","Letter from the guest editors of the topical collection on satellite orbit determination","Tseng, Tzu Pang (National Kaohsiung University of Science and Technology); Visser, P.N.A.M. (TU Delft Space Engineering)","","2022","","","en","contribution to periodical","","","","","","Copyright: Copyright 2021 Elsevier B.V., All rights reserved.","","","","Space Engineering","","","",""
"uuid:bfb4aaec-3a78-4a58-a788-cfd7e23991ba","http://resolver.tudelft.nl/uuid:bfb4aaec-3a78-4a58-a788-cfd7e23991ba","Intrinsically-typed definitional interpreters à la carte","van der Rest, C.R. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Rouvoet, A.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages); Mosses, P.D. (TU Delft Programming Languages)","","2022","Specifying and mechanically verifying type safe programming languages requires significant effort. This effort can in theory be reduced by defining and reusing pre-verified, modular components. In practice, however, existing approaches to modular mechanical verification require many times as much specification code as plain, monolithic definitions. This makes it hard to develop new reusable components, and makes existing component specifications hard to grasp. We present an alternative approach based on intrinsically-typed interpreters, which reduces the size and complexity of modular specifications as compared to existing approaches. Furthermore, we introduce a new abstraction for safe-by-construction specification and composition of pre-verified type safe language components: language fragments. Language fragments are about as concise and easy to develop as plain, monolithic intrinsically-typed interpreters, but require about 10 times less code than previous approaches to modular mechanical verification of type safety.","","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:5936cf9e-101d-4708-8a88-c79338fa03b9","http://resolver.tudelft.nl/uuid:5936cf9e-101d-4708-8a88-c79338fa03b9","Fuel cells systems for sustainable ships","van Biert, L. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations)","Baldi, Francesco (editor); Coraddu, Andrea (editor); Mondejar, Maria E. (editor)","2022","As shipping is setting sail for a sustainable future, the application of fuel cells is increasingly regarded as a promising technology to reduce or fully eliminate emissions. Fuel cells convert the chemical energy in fuels directly into electricity, achieving high efficiencies while emitting no hazardous compounds and producing little noise and vibrations. This chapter provides an overview of different fuel cell systems and discusses the various fuel cell types, working principles and characteristics. Particular attention is given to the low and high temperature polymer electrolyte membrane fuel cell and solid oxide fuel cell, as these are often considered to hold most potential for application in ships. The application of fuel cells is not restricted to the use of pure hydrogen, thus an overview of relevant fuel processing and purification technologies is provided as well. Operational aspects including electrical efficiency, part load performance, load transients, system start-up, heat recovery and combined cycle operation are introduced and subsequently discussed in the context of maritime application. Aspects related to ship design and operation, emission regulation compliance, reliability, availability, maintenance, safety and economics are briefly considered. Finally, an overview of relevant maritime experience and a future outlook are provided.","Fuel processing; Operation; PEMFC; Ships; SOFC","en","book chapter","Elsevier","","","","","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","","","Ship Design, Production and Operations","","",""
"uuid:73419081-f2e5-4fae-acb0-fa2531d86562","http://resolver.tudelft.nl/uuid:73419081-f2e5-4fae-acb0-fa2531d86562","Multi-level chemical characterization of dutch fine recycled concrete aggregates: a comparative study","Nedeljković, Marija (Delft University of Technology, the Netherlands - TNO, the Netherlands); Visser, Jeanette (TNO, the Netherlands); Nijland, Timo G. (TNO, the Netherlands); Valcke, Siska (TNO, the Netherlands); Schlangen, Erik (Delft University of Technology, the Netherlands)","","2021","In the Netherlands, beside cement replacement with more green cement types, there is also an urgent need for alternative materials for natural sand in new concrete in order to make it circular. Furthermore, the recyclers have raised questions regarding upscaling and the potential of fine recycled concrete aggregates (fRCA) in structural concrete elements since the availability of recycled construction rubble is increasing. The variations in their chemical and physical properties and lack of standards for their quality evaluation is the main reason for not yet using fRCA in new concrete. In this paper, an in-depth characterization of different fRCA is performed in order to define their chemical properties. The properties can be eventually related to concrete mix design and performance (next step), so that fRCA can be classified as a material that can be used in more advanced applications. This is achieved with a multi-level chemical characterization of individual and total fractions (0-0.25 mm, 0.25-4 mm and 0-4 mm) for finding type and content of the original sand and cement phases and potential contamination of selected fractions. The tests include quantification of element composition with X-ray fluorescence (XRF), qualitative and quantitative phase analysis with X-ray diffraction (XRD) and Rietveld method. In addition, cement paste content, chlorides and sulfates of each type of fRCA was measured in order to evaluate contamination of studied material. It was shown that fRCA from different origins have similar chemical and mineralogical composition and contain comparative chloride content. The chemical composition testing can provide a first line control regarding composition and potential contamination of fRCA. After that, it can be decided which additional tests are necessary to be done in order to evaluate the suitability of fRCA for replacement of primary natural fine aggregates in new concrete.","XRF; Fine recycled concrete aggregates; phases; contamination","en","conference paper","","","","","","","","","","","","","",""
"uuid:64a2277f-c223-4a95-85e1-e3b6ef143ac6","http://resolver.tudelft.nl/uuid:64a2277f-c223-4a95-85e1-e3b6ef143ac6","Solar-sail control laws for perturbed Earth-bound trajectories","Carzana, L. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering; TU Delft Astrodynamics & Space Missions); Heiligers, M.J. (TU Delft Astrodynamics & Space Missions)","","2021","Solar sailing is a spacecraft propulsion method relying solely on solar radiation pressure to provide thrust and is therefore propellantless by nature. Although it represents a practical and promising propulsion system particularly suited for heliocentric flight regimes, near-term sailcraft missions will remain Earth-bound due to the current technology readiness level. This paper aims to show the suitability of solar sailing for planetocentric applications for future Earth-bound solar-sail missions. In Earth orbit, the sailcraft is subjected to perturbations absent or negligible in heliocentric flight, including the effect of eclipses, non-spherical gravity and aerodynamic drag. The magnitude of these perturbations can be comparable to, or even exceed that of solar radiation pressure and their effect on the solarsail dynamics should be investigated to ensure the sailcraft’s transfer capabilities and controllability. This paper does so by including the gravitational and aerodynamic perturbations in the optimal control problem. From this formulation, steering laws can be derived to optimally change individual orbital elements. These newly derived steering laws form an extension to the laws found by McInnes for unperturbed solar-sail Earth-bound motion. By accounting for the perturbations in the derivation of the steering laws, their effect can be exploited by the sailcraft to achieve orbits otherwise unreachable. The improved maneuverability will be quantified based on the established increase of the targeted orbital element. A range of different starting orbits will be considered to characterize how the perturbations affect the solar-sail maneuvering capabilities in different orbital regimes. As demonstration of the real need for this investigation, NASA’s Advanced Composite Solar Sail System (ACS3) mission will be considered as real-case scenario. This mission is scheduled for launch in mid-2022 and may benefit from the steering laws derived in this paper to proof the maneuverability of solar sails in Earth orbit.","solar sail; trajectory optimization; steering law; Earth-bound; aerodynamic drag; ACS3 mission","en","conference paper","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:e82edb9a-f8ad-4187-b430-1a48f92ddd0c","http://resolver.tudelft.nl/uuid:e82edb9a-f8ad-4187-b430-1a48f92ddd0c","De Sint-Elisabethsvloed: Feiten en fictie","Schiereck, Gerrit Jan (Rijkswaterstaat); Visser, P.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering)","van Asperen, Hanneke (editor); Eekhout, Marianne (editor); Jensen, Lotte (editor)","2021","","","nl","book chapter","De Bezige Bij","","","","","","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:95996364-24b0-4974-a772-b514b4e4990d","http://resolver.tudelft.nl/uuid:95996364-24b0-4974-a772-b514b4e4990d","Analytical framework for mutual approximations: Derivation and application to Jovian satellites","Fayolle-Chambe, M.S. (TU Delft Astrodynamics & Space Missions); Dirkx, D. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering); Lainey, V. (PSL Research University)","","2021","Context. The apparent close encounters of two satellites in the plane of the sky, called mutual approximations, have been suggested as a different type of astrometric observation to refine the moons' ephemerides. The main observables are then the central instants of the close encounters, which have the advantage of being free of any scaling and orientation errors. However, no analytical formulation is available yet for the observation partials of these central instants, leaving numerical approaches or alternative observables (i.e. derivatives of the apparent distance instead of central instants) as options. Aims. Filling that gap, this paper develops an analytical method to include central instants as direct observables in the ephemerides estimation and assesses the quality of the resulting solution. Methods. To this end, the apparent relative position between the two satellites is approximated by a second-order polynomial near the close encounter. This eventually leads to an expression for mutual approximations' central instants as a function of the apparent relative position, velocity, and acceleration between the two satellites. Results. The resulting analytical expressions for the central instant partials were validated numerically. In addition, we ran a covariance analysis to compare the estimated solutions obtained with the two types of observables (central instants versus alternative observables), using the Galilean moons of Jupiter as a test case. Our analysis shows that alternative observables are almost equivalent to central instants in most cases. Accurate individual weighting of each alternative observable, accounting for the mutual approximation's characteristics (which are automatically included in the central instants' definition), is however crucial to obtain consistent solutions between the two observable types. Using central instants still yields a small improvement of 10-20% of the formal errors in the radial and normal directions (RSW frame), compared to the alternative observables' solution. This improvement increases when mutual approximations with low impact parameters and large impact velocities are included in the estimation. Conclusions. Choosing between the two observables thus requires careful assessment, taking into account the characteristics of the available observations. Using central instants over alternative observables ensures that the state estimation fully benefits from the information encoded in mutual approximations, which might be necessary depending on the application of the ephemeris solution.","Astrometry; Ephemerides; Methods: analytical; Planets and satellites: individual: Galilean moons","en","journal article","","","","","","","","2022-07-27","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:969d6fca-550f-4db2-95da-91cf02e68e2c","http://resolver.tudelft.nl/uuid:969d6fca-550f-4db2-95da-91cf02e68e2c","MPC Framework for the Energy Management of Hybrid Ships with an Energy Storage System","Antonopoulos, S. (Student TU Delft; Damen Naval BV); Visser, K. (TU Delft Ship Design, Production and Operations); Kalikatzarakis, Miltiadis (Damen Naval BV); Reppa, V. (TU Delft Transport Engineering and Logistics)","","2021","This paper proposes an advanced shipboard energy management strategy (EMS) based on model predictive control (MPC). This EMS aims to reduce mission-scale fuel consumption of ship hybrid power plants, taking into account constraints introduced by the shipboard battery system. Such constraints are present due to the boundaries on the battery capacity and state of charge (SoC) values, aiming to ensure safe seagoing operation and long-lasting battery life. The proposed EMS can be used earlier in the propulsion design process and requires no tuning of parameters for a specific operating profile. The novelties of the study reside in (i) studying the impact of mission-scale effects and integral constraints on optimal fuel consumption and controller robustness, (ii) benchmarking the performance of the proposed MPC framework. A case study carried out on a naval vessel demonstrates near-optimal and robust behaviour of the controller for several loading sequences. The application of the proposed MPC framework can lead to up to 3.5% consumption reduction due to utilisation of long term information, considering specific loading sequences and charge depleting (CD) battery operation","energy management strategies; model predictive control; hybrid propulsion; energy storage system; ship control","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:abe39665-6670-4e39-bb36-1af5bddb5dcf","http://resolver.tudelft.nl/uuid:abe39665-6670-4e39-bb36-1af5bddb5dcf","Optimal hot metal desulphurisation slag considering iron loss and sulphur removal capacity part I: fundamentals","Schrama, F.N.H. (TU Delft Team Yongxiang Yang; Tata Steel Europe Limited); Beunder, Elisabeth M. (Tata Steel Europe Limited); Panda, Sourav K. (Tata Steel Europe Limited); Visser, Hessel Jan (Tata Steel Europe Limited); Moosavi-Khoonsari, Elmira (Tata Steel Europe Limited); Sietsma, J. (TU Delft Materials Science and Engineering); Boom, R. (TU Delft Team Kevin Rossi); Yang, Y. (TU Delft Team Yongxiang Yang)","","2021","In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process. These iron losses are lower when the slag has a lower viscosity, which can be achieved by changing the slag composition. A lower slag basicity decreases the viscosity of the slag, but also lowers its sulphur removal capacity, therefore optimisation is necessary. In this study, the optimal HMD slag composition is investigated, considering both the sulphur removal capacity and the iron losses. In part I the theory is discussed and in part II the optimal slag is validated with plant data, laboratory experiments and a thermodynamic analysis.","basicity; Hot metal desulphurisation; iron loss; process optimisation; slag; steelmaking; sulphide capacity; viscosity","en","journal article","","","","","","","","","","Materials Science and Engineering","Team Yongxiang Yang","","",""
"uuid:45b5c984-68b9-4799-af32-c182e74bd297","http://resolver.tudelft.nl/uuid:45b5c984-68b9-4799-af32-c182e74bd297","A Gravity Assist Mapping Based on Gaussian Process Regression","Liu, Y. (TU Delft Astrodynamics & Space Missions); Noomen, R. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2021","We develop a Gravity Assist Mapping to quantify the effects of a flyby in a two-dimensional circular restricted three-body situation based on Gaussian Process Regression (GPR). This work is inspired by the Keplerian Map and Flyby Map. The flyby is allowed to occur anywhere above 300 km altitude at the Earth in the system of Sun-(Earth+Moon)-spacecraft, whereas the Keplerian map is typically restricted to the cases outside the Hill sphere only. The performance of the GPR model and the influence of training samples (number and distribution) on the quality of the prediction of post-flyby orbital states are investigated. The information provided by this training set is used to optimize the hyper-parameters in the GPR model. The trained model can make predictions of the post-flyby state of an object with an arbitrary initial condition and is demonstrated to be efficient and accurate when evaluated against the results of numerical integration. The method can be attractive for space mission design.","Circular restricted three-body problem; Gaussian process regression; Gravity assist","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:d8e9c3b3-a66c-4aa0-ad87-525d8c9f7416","http://resolver.tudelft.nl/uuid:d8e9c3b3-a66c-4aa0-ad87-525d8c9f7416","Creating the Illusion of Sportiness: Evaluating Modified Throttle Mapping and Artificial Engine Sound for Electric Vehicles","Melman, T. (TU Delft Human-Robot Interaction; Group Renault; ENSTA); Visser, P. (Group Renault; Student TU Delft); Mouton, Xavier (Group Renault); de Winter, J.C.F. (TU Delft Human-Robot Interaction)","","2021","Modern computerized vehicles offer the possibility of changing vehicle parameters with the aim of creating a novel driving experience, such as an increased feeling of sportiness. For example, electric vehicles can be designed to provide an artificial sound, and the throttle mapping can be adjusted to give drivers the illusion that they are driving a sports vehicle (i.e., without altering the vehicle’s performance envelope). However, a fundamental safety-related question is how drivers perceive and respond to vehicle parameter adjustments. As of today, human-subject research on throttle mapping is unavailable, whereas research on sound enhancement is mostly conducted in listening rooms, which provides no insight into how drivers respond to the auditory cues. This study investigated how perceived sportiness and driving behavior are affected by adjustments in vehicle sound and throttle mapping. Through a within-subject simulator-based experiment, we investigated (1) Modified Throttle Mapping (MTM), (2) Artificial Engine Sound (AES) via a virtually elevated rpm, and (3) MTM and AES combined, relative to (4) a Baseline condition and (5) a Sports car that offered increased engine power. Results showed that, compared to Baseline, AES and MTM-AES increased perceived sportiness and yielded a lower speed variability in curves. Furthermore, MTM and MTM-AES caused higher vehicle acceleration than Baseline during the first second of driving away from a standstill. Mean speed and comfort ratings were unaffected by MTM and AES. The highest sportiness ratings and fastest driving speeds were obtained for the Sports car. In conclusion, the sound enhancement not only increased the perception of sportiness but also improved drivers’ speed control performance, suggesting that sound is used by drivers as functional feedback. The fact that MTM did not affect the mean driving speed indicates that drivers adapted their “gain” to the new throttle mapping and were not susceptible to risk compensation.","OA-Fund TU Delft","en","journal article","","","","","","","","","","","Human-Robot Interaction","","",""
"uuid:ccd9fcfc-6cf5-4447-b8b4-b862ce1b4483","http://resolver.tudelft.nl/uuid:ccd9fcfc-6cf5-4447-b8b4-b862ce1b4483","Scope states: Guarding safety of name resolution in parallel type checkers","van Antwerpen, H. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Moller, Anders (editor); Sridharan, Manu (editor)","2021","Compilers that can type check compilation units in parallel can make more efficient use of multi-core architectures, which are nowadays widespread. Developing parallel type checker implementations is complicated by the need to handle concurrency and synchronization of parallel compilation units. Dependencies between compilation units are induced by name resolution, and a parallel type checker needs to ensure that units have defined all relevant names before other units do a lookup. Mutually recursive references and implicitly discovered dependencies between compilation units preclude determining a static compilation order for many programming languages. In this paper, we present a new framework for implementing hierarchical type checkers that provides implicit parallel execution in the presence of dynamic and mutual dependencies between compilation units. The resulting type checkers can be written without explicit handling of communication or synchronization between different compilation units. We achieve this by providing type checkers with an API for name resolution based on scope graphs, a language-independent formalism that supports a wide range of binding patterns. We introduce the notion of scope state to ensure safe name resolution. Scope state tracks the completeness of a scope, and is used to decide whether a scope graph query between compilation units must be delayed. Our framework is implemented in Java using the actor paradigm. We evaluated our approach by parallelizing the solver for Statix, a meta-language for type checkers based on scope graphs, using our framework. This parallelizes every Statix-based type checker, provided its specification follows a split declaration-type style. Benchmarks show that the approach results in speedups for the parallel Statix solver of up to 5.0x on 8 cores for real-world code bases.","Name resolution; Parallel algorithms; Type checking","en","conference paper","Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing","","","","","","","","","","Programming Languages","","",""
"uuid:f3a48d79-0dd4-4ef4-9042-645dbd9c4d0b","http://resolver.tudelft.nl/uuid:f3a48d79-0dd4-4ef4-9042-645dbd9c4d0b","Comparing the Recommendations of Buyers of Energy-Efficient and Inefficient Vacuum Cleaners","Visser, Mirjam (TU Delft Marketing and Consumer Research); Stevels, A.L.N. (TU Delft Design for Sustainability); Schoormans, J.P.L. (TU Delft Marketing and Consumer Research; TU Delft Design, Organisation and Strategy)","","2021","Although environmental awareness is increasing every year, and most people say they prefer to buy more sustainable products, many still do not act on their promise at the cash counter. Sustainable products are often still perceived to have lower quality or reduced performance. Recom- mendations of sustainable buyers might reduce this perceived risk of sustainability. In this research, the Net-Promotor-Scores (NPS) and the underlying reasons for such recommendations of 888 vacuum cleaner buyers were analyzed. The buyers of energy-efficient vacuum cleaners were found to be significantly less positive about their purchase. A difference in scores is, however, not caused by the difference in the energy efficiency of the products, but by differences in other drivers to recommend a product, such as perceived cleaning performance, ease of use and value for money. Additionally, higher suction power and increased weight positively mediated NPS ratings, irrespective of energy efficiency. Focusing design and communication on these aspects rather than on energy efficiency alone can be used to reduce the perceived green risk and increase trust in sustainable products. In this way, recommendations of buyers of energy-efficient appliances can be an effective additional tool in increasing sustainable consumption.","Appliances; Green marketing; Product satisfaction; Sustainable consumption; Sustainable risk; Word of mouth","en","journal article","","","","","","","","","","Design, Organisation and Strategy","Marketing and Consumer Research","","",""
"uuid:d34ba9a0-2e33-44d0-8018-5010bc72489d","http://resolver.tudelft.nl/uuid:d34ba9a0-2e33-44d0-8018-5010bc72489d","Multi-level chemical characterization of dutch fine recycled concrete aggregates: a comparative study","Nedeljković, Marija (TU Delft Materials and Environment; TNO); Visser, Jeanette (TNO); Nijland, Timo G. (TNO); Valcke, Siska (TNO); Schlangen, E. (TU Delft Materials and Environment)","Ye, Guang (editor); Dong, Hua (editor); Liu, Jiaping (editor); Schlangen, Erik (editor); Miao, Changwen (editor)","2021","In the Netherlands, beside cement replacement with more green cement types, there is also an urgent need for alternative materials for natural sand in new concrete in order to make it circular. Furthermore, the recyclers have raised questions regarding upscaling and the potential of fine recycled concrete aggregates (fRCA) in structural concrete elements since the availability of recycled construction rubble is increasing. The variations in their chemical and physical properties and lack of standards for their quality evaluation is the main reason for not yet using fRCA in new concrete. In this paper, an in-depth characterization of different fRCA is performed in order to define their chemical properties. The properties can be eventually related to concrete mix design and performance (next step), so that fRCA can be classified as a material that can be used in more advanced applications. This is achieved with a multi-level chemical characterization of individual and total fractions (0-0.25 mm, 0.25-4 mm and 0-4 mm) for finding type and content of the original sand and cement phases and potential contamination of selected fractions. The tests include quantification of element composition with X-ray fluorescence (XRF), qualitative and quantitative phase analysis with X-ray diffraction (XRD) and Rietveld method. In addition, cement paste content, chlorides and sulfates of each type of fRCA was measured in order to evaluate contamination of studied material. It was shown that fRCA from different origins have similar chemical and mineralogical composition and contain comparative chloride content. The chemical composition testing can provide a first line control regarding composition and potential contamination of fRCA. After that, it can be decided which additional tests are necessary to be done in order to evaluate the suitability of fRCA for replacement of primary natural fine aggregates in new concrete.","Fine recycled concrete aggregates; phases; contamination; XRF","en","conference paper","Delft University of Technology","","","","","","","","","","Materials and Environment","","",""
"uuid:8b3e3e1e-0bcb-4446-8e03-868ba86ad6f2","http://resolver.tudelft.nl/uuid:8b3e3e1e-0bcb-4446-8e03-868ba86ad6f2","Editors' Choice - Dealloying-Driven Cerium Precipitation on Intermetallic Particles in Aerospace Aluminium Alloys","Kosari, A. (TU Delft Team Yaiza Gonzalez Garcia); Ahmadi, M. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Tichelaar, F.D. (Kavli institute of nanoscience Delft); Visser, P. (Akzo Nobel); Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","Cerium-based compounds have been studied for decades as non-toxic candidates for the protection of aerospace aluminium alloys (AAs) like AA2024-T3. However, the complex heterogeneous microstructure of these alloys has hindered a thorough understanding of the subsequent stages of corrosion protection provided by this class of inhibitors. Thus, this work is devoted to unravelling the interaction mechanisms of different intermetallic particles (IMPs) in AA2024-T3 with cerium nitrate at the nanoscopic scale. This has been fulfilled through detailed top-view and cross-sectional analytical TEM investigations along with electrochemical evaluations. In line with our recent findings, we here report dealloying of IMPs as the main factor governing the rate of local cerium precipitation in contrast to micro-galvanic corrosion between IMPs and the surrounding matrix. Furthermore, we discuss a connection between the electrochemical response of the AA2024-T3 system and the morphological and compositional evolutions of individual IMPs including Al2CuMg, Al2Cu, Al7Cu2Fe(Mn) and Al76Cu6Fe7Mn5Si6 at different stages of a 96-h exposure.","","en","journal article","","","","","","","","","","","Team Yaiza Gonzalez Garcia","","",""
"uuid:5a9d723d-dbec-493d-b147-47905d2eacc5","http://resolver.tudelft.nl/uuid:5a9d723d-dbec-493d-b147-47905d2eacc5","Optimal hot metal desulphurisation slag considering iron loss and sulphur removal capacity part II: evaluation","Schrama, F.N.H. (TU Delft Team Yongxiang Yang; Tata Steel); Beunder, Elisabeth M. (Tata Steel); Panda, Sourav K. (Tata Steel); Visser, Hessel Jan (Tata Steel); Moosavi-Khoonsari, Elmira (Tata Steel); Hunt, Adam (Materials Processing Institute); Sietsma, J. (TU Delft Team Kevin Rossi); Boom, R. (TU Delft Team Kevin Rossi); Yang, Y. (TU Delft Team Yongxiang Yang)","","2021","The optimal hot metal desulphurisation (HMD) slag is defined as a slag with a sufficient sulphur removal capacity and a low apparent viscosity (ηslag) which leads to low iron losses. In part I of this study, the fundamentals behind the optimal slag were discussed. In this part these fundamentals are explored by a Monte Carlo simulation, based on FactSage calculations, plant data analysis and melting point and viscosity measurements of the optimal slag. Furthermore, the applicability of knowing the optimal slag composition for an industrial HMD is discussed.","Hot metal desulphurisation; industrial data; iron loss; Monte Carlo simulation; slag; sulphide capacity; thermodynamics; viscosity and melting point experiments","en","journal article","","","","","","","","","","","Team Yongxiang Yang","","",""
"uuid:3d860084-efd2-430d-8d61-32701d6a6f0c","http://resolver.tudelft.nl/uuid:3d860084-efd2-430d-8d61-32701d6a6f0c","Robust flight-to-gate assignment with landside capacity constraints","L’Ortye, J. (Student TU Delft); Mitici, M.A. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations)","","2021","At the interface between airport airside and landside operations, the assignment of flights to gates is key to ensure efficient operations and a high quality of service for passengers. We propose a mixed-integer linear program for an integrated flight-to-gate assignment that considers both airside as well as landside constraints on the capabilities of facilities such as check-in, security or transfer to handle passengers. Moreover, our assignment is robust in that it constrains the probability of multiple flights being assigned to the same gate. Having obtained an integrated, robust flight-to-gate assignment, we analyse the associated quality of service at the landside facilities. Overall, our model supports the design of a robust, integrated airside-landside assignment of flights to gates at an airport.","Amsterdam Airport Schiphol; flight splitting; Flight-to-gate; landside airport constraints; robust optimization","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:ac6ac5d6-f28d-43ea-bedc-a719ba99cce4","http://resolver.tudelft.nl/uuid:ac6ac5d6-f28d-43ea-bedc-a719ba99cce4","Highly-conformal sputtered through-silicon vias with sharp superconducting transition","Alfaro Barrantes, J.A. (TU Delft EKL Processing); Mastrangeli, Massimo (TU Delft Electronic Components, Technology and Materials); Thoen, David (TU Delft Tera-Hertz Sensing); Visser, Sten (SRON Netherlands Institute for Space Research); Bueno Lopez, J. (TU Delft Electronics; TU Delft Tera-Hertz Sensing); Baselmans, J.J.A. (TU Delft Tera-Hertz Sensing); Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials)","","2021","This paper describes the microfabrication and electrical characterization of aluminum-coated superconducting through-silicon vias (TSVs) with sharp superconducting transition above 1 K. The sharp superconducting transition was achieved by means of fully conformal and void-free DC-sputtering of the TSVs with Al, and is here demonstrated in up to 500μ m-deep vias. Full conformality of Al sputtering was made possible by shaping the vias with a tailored hourglass profile, which allowed a metallic layer as thick as 430 nm to be deposited in the center of the vias. Single-via electric resistance as low as 160 mΩ at room temperature and superconductivity at 1.27 K were measured by a three-dimensional (3D) cross-bridge Kelvin resistor structure. This work establishes a CMOS-compatible fabrication process suitable for arrays of superconducting TSVs and 3D integration of superconducting silicon-based devices. [2020-0354].","Aluminum; Fabrication; Silicon; Sputtering; Superconducting epitaxial layers; Superconducting integrated circuits; Temperature measurement; Through-silicon vias; cryogenic; interconnects; sputtering; superconducting; through-silicon vias","en","journal article","","","","","","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.","","2021-08-31","","","EKL Processing","","",""
"uuid:27b89be1-47de-40a2-94ad-fa074421215d","http://resolver.tudelft.nl/uuid:27b89be1-47de-40a2-94ad-fa074421215d","Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system","Visser, P. (TU Delft (OLD) MSE-6; AkzoNobel); Ranade, S. (Indian Institute of Technology Madras); Laird, J. S. (University of Melbourne); Glenn, A. M. (CSIRO, Mineral Resources); Hughes, A. E. (Deakin University; CSIRO, Mineral Resources); Terryn, H.A. (TU Delft Team Arjan Mol; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","Depletion depths of inorganic components from a scribe edge in a polyurethane primer containing Li2CO3, MgO, BaSO4 and TiO2 beneath a topcoat, were determined using a range of techniques including SEM/EDS and proton induced X-ray and γ-ray emission spectroscopies. SEM of sections cut using an ion beam revealed scribe damage penetrating 20–25 μm away from the scribe edge prior to leaching. After neutral salt spray (NSS) exposure a leached zone developing from the scribe edge was observed. For longer NSS exposure times (>96 h) this leached zone of nearly complete Li and Mg depletion did not develop any deeper than the scribe damaged region indicating that the depletion zone was caused by mechanical damage due to scribing. At short times small voids were formed in Li2CO3 particles within the primer well away from the scribe (100–260 μm) whereas a mixture of void and detachment in and around Li2CO3 particles was observed at longer times. The detachment was assumed to be part of a channel network within clusters of particles. Internal stresses within the primer resulting from buildup of inhibitor dissolution product within the voids were modelled using finite element analysis. It was found that strains related to von Mises stresses were concentrated around the inorganic particles and developed preferentially within the plane of the primer beneath the topcoat with some indication of concentration towards the primer/metal interface. These stresses resulted from osmosis and swelling related to the voids. They were also attributed to the observed cracking of the binder at some locations. Leaching experiments showed that Li was released very rapidly from the primer. The leaching data was modelled using a power law where the mass released is proportional to tn where the n is an index that reflects the kinetic behavior dictated by the evolving primer porosity. In this study n values between 0 and 1 were observed for all species, with Li starting at around 0.7 but rapidly decreasing to close to zero.","Characterisation; Coating; Corrosion; Leaching; Lithium inhibitor","en","journal article","","","","","","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.","","2021-12-08","","","(OLD) MSE-6","","",""
"uuid:0c686221-a2b7-4a07-b469-fc5534b4af17","http://resolver.tudelft.nl/uuid:0c686221-a2b7-4a07-b469-fc5534b4af17","Physical, chemical and mineralogical characterization of Dutch fine recycled concrete aggregates: A comparative study","Nedeljković, Marija (TU Delft Materials and Environment; TNO); Visser, Jeanette (TNO); Nijland, Timo G. (TNO); Valcke, Siska (TNO); Schlangen, E. (TU Delft Materials and Environment)","","2021","In circular concrete design, beside cement replacement with more environmentally friendly cement types, there is also an urgent need for sand replacement with fine recycled concrete aggregates (fRCA). The variations in physical and chemical properties of fRCA and lack of standards for their quality evaluation are the main reasons for not yet using fRCA in new concrete. In this study, an in-depth characterization of different Dutch fRCA is performed in order to examine suitability of fRCA as an alternative material for river sand and define indicators for fRCA quality. These indicators eventually can be related to concrete mix design and performance, so that fRCA can be classified as a material that can be used in structural concrete elements. This is achieved with physical, chemical and mineralogical characterization of individual and total fractions (0–0.250 mm, 0.250–4 mm and 0–4 mm). The physical properties such as grading, density, surface area, water absorption and cement paste content of fRCA were tested. The chemical analyses include quantification of element composition with X-ray fluorescence spectrometry (XRF) and carbonate content with thermogravimetry and mass spectrometry (TG-MS). Potential contamination (chlorides and sulfates) and reactivity of selected fractions were evaluated. In addition, qualitative and quantitative phase analyses with X-ray diffraction (XRD) combined with Rietveld refinement method were performed and supported by optical polarizing-and-fluorescence microscopic (PFM) study. Based on combined experimental approaches, characteristic quality indicators were defined for fRCA. These indicators showed that fRCA were uncontaminated and nonreactive. Despite fRCA were from different origins, they had similar chemical and mineralogical composition and contained comparative chloride content. In contrast, the content and surface area of fine fraction (0–0.250 mm) and particle size distribution of fRCA varied with the source. With this it can be assumed that fRCA will have different effect on the properties of the new concrete.","Circular concrete; Fine recycled concrete aggregates; Microscopic study; Mineralogy; Quality indicators","en","journal article","","","","","","","","","","","Materials and Environment","","",""
"uuid:156e4db9-23f4-40d5-a927-e42bcd1536e9","http://resolver.tudelft.nl/uuid:156e4db9-23f4-40d5-a927-e42bcd1536e9","A gravity assist mapping for the circular restricted three-body problem using Gaussian processes","Liu, Y. (TU Delft Astrodynamics & Space Missions); Noomen, R. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering)","","2021","Inspired by the Keplerian Map and the Flyby Map, a Gravity Assist Mapping using Gaussian Process Regression for the fully spatial Circular Restricted Three-Body Problem is developed. A mapping function for quantifying the flyby effects over one orbital period is defined. The Gaussian Process Regression model is established by proper mean and covariance functions. The model learns the dynamics of flyby's from training samples, which are generated by numerical propagation. To improve the efficiency of this method, a new criterion is proposed to determine the optimal size of the training dataset. We discuss its robustness to show the quality of practical usage. The influence of different input elements on the flyby effects is studied. The accuracy and efficiency of the proposed model have been investigated for different energy levels, ranging from representative high- to low-energy cases. It shows improvements over the Kick Map, an independent semi-analytical method available in literature. The accuracy and efficiency of predicting the variation of the semi-major axis are improved by factors of 3.3, and 1.27×104, respectively.","Gaussian process regression; Gravity assist mapping; Machine learning","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:a45cb92f-335a-4f9f-989f-7819bf4df810","http://resolver.tudelft.nl/uuid:a45cb92f-335a-4f9f-989f-7819bf4df810","Nanoscopic and in-situ cross-sectional observations of Li-based conversion coating formation using liquid-phase TEM","Kosari, A. (TU Delft Team Yaiza Gonzalez Garcia); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Visser, P. (Akzo Nobel); Taheri, P. (TU Delft Team Peyman Taheri); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","Lithium salts have been proposed as promising environmentally friendly alternatives to carcinogenic hexavalent chromium-based inhibitors for the corrosion protection of aerospace aluminium alloys (AAs). Incorporated into organic coatings, lithium salts are released at damaged locations to establish a conversion layer in which distinct sublayers have different barrier characteristics. Thus, detailed knowledge on the sequence of formation events from the early stages of nucleation towards the final multi-layered arrangement is essential for developing and optimising lithium-leaching technology for protective coatings. Here, liquid-phase-transmission electron microscopy (LP-TEM) is employed to observe nanoscopic morphological evolutions in situ during the lithium-based conversion process of AA2024-T3. Thanks to dedicated preparation of delicate sandwiched TEM specimens allowing us to explore the events cross-sectionally, we provide real-time direct mechanistic information on the conversion process from the initiation to an advanced growth stage. In parallel, we perform supplementary ex situ SEM and TEM investigations to support and validate the LP-TEM findings. The unprecedented experimental approach developed and executed in this study provides an inspiring base for studying also other complicated surface conversion processes in situ and at the nanoscopic scale.","","en","journal article","","","","","","","","","","","Team Yaiza Gonzalez Garcia","","",""
"uuid:2fddd5f5-4982-471b-bddc-7337f14017e5","http://resolver.tudelft.nl/uuid:2fddd5f5-4982-471b-bddc-7337f14017e5","Laterally-resolved formation mechanism of a lithium-based conversion layer at the matrix and intermetallic particles in aerospace aluminium alloys","Kosari, A. (TU Delft Team Yaiza Gonzalez Garcia); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Visser, P. (TU Delft (OLD) MSE-6; Akzo Nobel); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","Lithium leaching coatings have recently been developed as eco-friendly active corrosion protection technology for aerospace aluminium alloys (AAs) by the formation of a conversion layer at coating defects. While general conversion layer formation characteristics were studied and reported before, here we study the local layer formation process with sub-micron resolution at and around intermetallic particles (IMPs) in AA2024-T3. Top- and cross-sectional-view morphological electron micrograph observations along with open circuit potential (OCP) measurements are performed, mimicking coating defect conditions upon lithium carbonate leaching from the coating matrix. The results revealed five stages of the conversion process in which the alloy matrix and different IMPs evolve morphologically, compositionally, and electrochemically. Besides, we found a correlation between the OCP response of the AA2024-T3 system and the morphological and compositional evolutions of the alloy matrix and IMPs at different stages of exposure. Passive layer and alloy matrix dissolution leading to surface Cu-enrichment and S-phase dealloying occur at early stages of exposure. They precede the formation of a columnar layer on the alloy, followed by the establishment of a dense-like layer at the final stage. Dealloying of Al2CuMg can assist the conversion process by providing local supersaturation. Through complementary experiments in a sodium carbonate solution and besides X-ray diffraction analysis, we found out that lithium plays a critical role in stabilising the corrosion product throughout the conversion process.","AA2024-T3; Conversion coating; Dealloying; FIB/SEM; Intermetallic particles; Lithium carbonate; Passivation; TEM","en","journal article","","","","","","","","","","","Team Yaiza Gonzalez Garcia","","",""
"uuid:94fc5e34-3aed-4309-884e-2113efc56d57","http://resolver.tudelft.nl/uuid:94fc5e34-3aed-4309-884e-2113efc56d57","An integrated framework of coastal flood modelling under the failures of sea dikes: a case study in Shanghai","Ke, Q. (TU Delft Hydraulic Structures and Flood Risk); Yin, Jiangshan (Nanjing Hydraulic Research Institute); Bricker, J.D. (TU Delft Hydraulic Structures and Flood Risk; University of Michigan); Savage, Nicholas (Met Office); Buonomo, Erasmo (Met Office); Ye, Qinghua (Deltares); Visser, P.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Dong, Guangtao (Shanghai Climate Centre); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk)","","2021","Climate change leads to sea level rise worldwide, as well as increases in the intensity and frequency of tropical cyclones (TCs). Storm surge induced by TC’s, together with spring tides, threatens to cause failure of flood defenses, resulting in massive flooding in low-lying coastal areas. However, limited research has been done on the combined effects of the increasing intensity of TCs and sea level rise on the characteristics of coastal flooding due to the failure of sea dikes. This paper investigates the spatial variation of coastal flooding due to the failure of sea dikes subject to past and future TC climatology and sea level rise, via a case study of a low-lying deltaic city- Shanghai, China. Using a hydrodynamic model and a spectral wave model, storm tide and wave parameters were calculated as input for an empirical model of overtopping discharge rate. The results show that the change of storm climatology together with relative sea level rise (RSLR) largely exacerbates the coastal hazard for Shanghai in the future, in which RSLR is likely to have a larger effect than the TC climatology change on future coastal flooding in Shanghai. In addition, the coastal flood hazard will increase to a large extent in terms of the flood water volume for each corresponding given return period. The approach developed in this paper can also be utilized to investigate future flood risk for other low-lying coastal regions.","Climate change; Coastal flooding; Dike failure; Sea level rise; Tropical cyclone","en","journal article","","","","","","Correction DOI: 10.1007/s11069-021-04935-y","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:8104ecbe-9ca9-470f-ae3d-492881743f9e","http://resolver.tudelft.nl/uuid:8104ecbe-9ca9-470f-ae3d-492881743f9e","Safe-by-design in engineering: An overview and comparative analysis of engineering disciplines","van Gelder, P.H.A.J.M. (TU Delft Safety and Security Science); Taebi, B. (TU Delft Ethics & Philosophy of Technology); van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering); van de Poel, I.R. (TU Delft Ethics & Philosophy of Technology); Asveld, L. (TU Delft BT/Biotechnology and Society); Balkenende, R. (TU Delft Circular Product Design); Hollmann, F. (TU Delft BT/Biocatalysis); van Kampen, E. (TU Delft Control & Simulation); Krebbers, R.J. (TU Delft Programming Languages); de Lange, J. (TU Delft Quantum Communications Lab); Terwel, K.C. (TU Delft Applied Mechanics); Visser, Eelco (TU Delft Programming Languages)","","2021","In this paper, we provide an overview of how Safe-by-Design is conceived and applied in practice in a large number of engineering disciplines. We discuss the differences, commonalities, and possibilities for mutual learning found in those practices and identify several ways of putting those disciplinary outlooks in perspective. The considered engineering disciplines in the order of historically grown technologies are construction engineering, chemical engineering, aerospace engineering, urban engineering, software engineering, bio-engineering, nano-engineering, and finally cyber space engineering. Each discipline is briefly introduced, the technology at issue is described, the relevant or dominant hazards are examined, the social challenge(s) are observed, and the relevant developments in the field are described. Within each discipline the risk management strategies, the design principles promoting safety or safety awareness, and associated methods or tools are discussed. Possible dilemmas that the designers in the discipline face are highlighted. Each discipline is concluded by discussing the opportunities and bottlenecks in addressing safety. Commonalities and differences between the engineering disciplines are investigated, specifically on the design strategies for which empirical data have been collected. We argue that Safe-by-Design is best considered as a specific elaboration of Responsible Research and Innovation, with an explicit focus on safety in relation to other important values in engineering such as well-being, sustainability, equity, and affordability. Safe-by-Design provides for an intellectual venue where social science and the humanities (SSH) collaborate on technological developments and innovation by helping to proactively incorporate safety considerations into engineering practices, while navigating between the extremes of technological optimism and disproportionate precaution. As such, Safe-by-Design is also a practical tool for policymakers and risk assessors that helps shape governance arrangements for accommodating and incentivizing safety, while fully acknowledging uncertainty.","Design for values; Responsible research and innovation; Risk-based design; Safe-by-design; Secure-by-design; Uncertainty","en","journal article","","","","","","","","","","","Safety and Security Science","","",""
"uuid:800a6eb2-bf8e-41d2-aebe-51fabad8fbb4","http://resolver.tudelft.nl/uuid:800a6eb2-bf8e-41d2-aebe-51fabad8fbb4","Challenges to electrochemical evaluation of nanometric sandwiched thin specimens using liquid cells designed for application in liquid-phase TEM corrosion studies","Kosari, A. (TU Delft Team Yaiza Gonzalez Garcia); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Visser, P. (Akzo Nobel); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","Liquid-phase transmission electron microscopy (LP-TEM) has provided corrosion scientists with a unique opportunity to directly correlate nanoscopic morphological and compositional evolutions to the corresponding electrochemical response of corroding thin TEM specimens. Electrochemical liquid cell designs are key components of a LP-TEM study towards an implementation which is representative for realistic exposure conditions of bulk samples. However, the application of commercially available liquid cells in corrosion studies brings along an important shortcoming of galvanic coupling effects due to the inevitable connection of the TEM specimens with Pt patterned electrodes. Here, we introduce an approach of fabricating electrochemical liquid cells to alleviate the current cell design challenge for corrosion studies. Besides, we present a protocol for preparing thin specimens to be electrochemically investigated with our home-made electrochemical liquid cell. We finally confirm the effectiveness of this methodology by electrochemically evaluating thin specimens of AA2024-T3 in an open-cell configuration through open circuit potential and potentiodynamic polarisation measurements.","Electrochemical liquid cell; FIB/SEM; Light alloys; Liquid-phase TEM; Potentiodynamic polarisation","en","journal article","","","","","","","","","","","Team Yaiza Gonzalez Garcia","","",""
"uuid:95d2bdf5-665e-47c0-bbfe-079de34184d0","http://resolver.tudelft.nl/uuid:95d2bdf5-665e-47c0-bbfe-079de34184d0","Influence of sand drying and mixing sequence on the performance of mortars with fine recycled concrete aggregates","Nedeljković, Marija (TU Delft Materials and Environment; TNO); Mylonas, Akis (Student TU Delft; TNO); Wiktor, Virginie (Cugla B.V.); Schlangen, E. (TU Delft Materials and Environment); Visser, Jeanette (TNO)","","2021","Fine recycled concrete aggregates (fRCA, 0–4 mm) are produced from demolished concrete structures and consist of natural aggregates and old cement mortar. The presence of old cement mortar has detrimental effect on the fresh properties and strength of new concrete. This study aims to investigate the working mechanism and effectiveness of different methods for the optimization of mortar mixtures with fRCA. Three streams of fRCA were considered in the approach. As reference material, river sand was used. The river sand was replaced at 0 wt%, 25 wt% and 50 wt% with fRCA. The use of tailor-made superplasticizers (SP's), drying of fRCA, modified content of 0–0.250 mm, modified mixing sequence, increase of cement content were investigated. Once the mortar mixtures were optimized, the reaction kinetics was investigated with isothermal calorimetry. SP was applied to prevent use of additional water and to maintain mix consistency. When the river sand was replaced at 25 wt% with fRCA, no extra cement was needed. The air content of mortars with fRCA was up to 18 %, due to some unforeseen effects. The results indicated that using as received, agglomerated and unwashed fRCA may have a negative effect on the working mechanism of SP leading to high air content in the fresh mortars. Using dried fRCA has substantially decreased air content in mortars. In addition to drying of fRCA, change of mixing sequence has equal or even superior importance to reduction of air content. As a result, the compressive strength was comparable to reference mix with river sand at 25 wt% replacement level, however, the strength of mortars with 50 wt% fRCA was reduced despite that the cement paste content was increased. The use of fRCA did not affect the kinetics and degree of cement hydration in mortars with 25 wt% fRCA. The positive side of this is that the fRCA can be considered as non-reactive.","Agglomeration; Air content; Fine recycled concrete aggregates; Mixing sequence; Mortar; Storage; Superplasticizers","en","journal article","","","","","","","","","","","Materials and Environment","","",""
"uuid:7e1ff16f-85ee-4078-b40c-ed7c44ed22a7","http://resolver.tudelft.nl/uuid:7e1ff16f-85ee-4078-b40c-ed7c44ed22a7","Gas-surface interactions modelling influence on satellite aerodynamics and thermosphere mass density","March, G. (TU Delft Astrodynamics & Space Missions; European Space Agency (ESA)); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Siemes, C. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Space Engineering); Doornbos, Eelco N. (Royal Netherlands Meteorological Institute (KNMI)); Pilinski, Marcin (University of Colorado)","","2021","The satellite acceleration data from the CHAMP, GRACE, GOCE, and Swarm missions provide detailed information on the thermosphere density over the last two decades. Recent work on reducing errors in modelling the spacecraft geometry has greatly reduced scale differences between the thermosphere data sets from these missions. However, residual inconsistencies between the data sets and between data and models are still present. To a large extent, these differences originate in the modelling of the gas-surface interactions (GSI), which is part of the satellite aerodynamic modelling used in the acceleration to density data processing. Physics-based GSI models require in-situ atmospheric composition and temperature data that are not measured by any of the above-mentioned satellites and, as a consequence, rely on thermosphere models for these inputs. To reduce the dependence on existing thermosphere models, we choose a GSI model with a constant energy accommodation coefficient per mission, which we optimize exploiting particular attitude manoeuvres and wind analyses to increase the self-consistency of the multi-mission thermosphere mass density data sets. We compare our results with those based on variable energy accommodation obtained by different studies and semi-empirical models to show the principal differences. The presented comparisons provide novel opportunity to quantify the discrepancies between current GSI models. Among the presented data, density variations with variable accommodation are within ±10%, and peaks can reach up to 15% at the poles. The largest differences occur during low solar activity periods. In addition, we utilize a series of attitude manoeuvres performed in May 2014 by the Swarm A and C satellites, which are flying in close proximity, to evaluate the residual inconsistency of the density observations as a function of the energy accommodation coefficient. Our analysis demonstrates that an energy accommodation coefficient of 0.85 maximizes the consistency of the Swarm density observations during the attitude manoeuvres. Using such coefficient, for Swarm A and Swarm C, the new density would be lower in magnitude with a 4-5% difference. In recent studies, similar energy accommodation coefficients were retrieved for the CHAMP and GOCE missions by investigating thermospheric winds. These new values for the energy accommodation coefficient provide a higher consistency among different missions and models. A comparison of neutral densities between current thermosphere models and observations indicates that semi-empirical models such as NRLMSISE-00 and DTM-2013 significantly overestimate the density, and that an overall higher consistency between the observations from the different missions can be achieved with the presented assumptions. The new densities from this work provide consistencies of 4.13% and 3.65% between the minimum and maximum mean ratios among the selected missions with NRLMSISE-00 and DTM-2013, respectively. A comparison with the WACCM-X general circulation model is also performed. Similar to the other models, WACCM-X seems to provide higher estimates of mass density especially under high and moderate solar activities. This work has the objective to guide density data users over the multiple data sets and highlight the remaining uncertainties associated with different GSI models.","Accelerometer; Atmospheric drag; Gas-surface interactions; Mass density; Satellite aerodynamics; Thermosphere","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:f6948163-0cbb-464e-808b-46253e053a06","http://resolver.tudelft.nl/uuid:f6948163-0cbb-464e-808b-46253e053a06","The science case and challenges of spaceborne sub-millimeter interferometry: the study case of TeraHertz Exploration and Zooming-in for Astrophysics (THEZA)","Gurvits, L. (TU Delft Astrodynamics & Space Missions; Joint Institute for VLBI ERIC); Paragi, Zsolt (Joint Institute for VLBI ERIC); Amils, Ricardo I. (Ign); van Bemmel, Ilse (Joint Institute for VLBI ERIC); Casasola, Viviana (INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna); Conway, John (Onsala Space Observatory); Masania, K. (Joint Institute for VLBI ERIC); Rajan, R.T. (Joint Institute for VLBI ERIC; INAF Istituto di Radioastronomia); Visser, P.N.A.M. (TU Delft Space Engineering)","","2021","Ultra-high angular resolution in astronomy has always been an important vehicle for making fundamental discoveries. Recent results in direct imaging of the vicinity of the super-massive black hole in the nucleus of the radio galaxy M87 by the millimeter VLBI system Event Horizon Telescope (EHT) and various pioneering results of the Space VLBI mission RadioAstron provided new momentum in high angular resolution astrophysics. In both mentioned cases, the angular resolution reached the values of about 10−20 microrcseconds (0.05−0.1 nanoradian). Angular resolution is proportional to the observing wavelength and inversely proportional to the interferometer baseline length. In the case of Earth-based EHT, the highest angular resolution was achieved by combining the shortest possible wavelength of 1.3 mm with the longest possible baselines, comparable to the Earth’s diameter. For RadioAstron, operational wavelengths were in the range from 92 cm down to 1.3 cm, but the baselines were as long as ∼350,000 km. However, these two highlights of radio astronomy, EHT and RadioAstron do not”saturate” the interest to further increase in angular resolution. Quite opposite: the science case for further increase in angular resolution of astrophysical studies becomes even stronger. A natural and, in fact, the only possible way of moving forward is to enhance mm/sub-mm VLBI by extending baselines to extraterrestrial dimensions, i.e. creating a mm/sub-mm Space VLBI system. The inevitable move toward space-borne mm/sub-mm VLBI is a subject of several concept studies. In this presentation we will focus on one of them called TeraHertz Exploration and Zooming-in for Astrophysics (THEZA), prepared in response to the ESA’s call for its next major science program Voyage 2050 (Gurvits et al. 2021). The THEZA rationale is focused at the physics of spacetime in the vicinity of super-massive black holes as the leading science drive. However, it will also open up a sizable new range of hitherto unreachable parameters of observational radio astrophysics and create a multi-disciplinary scientific facility and offer a high degree of synergy with prospective “single dish” space-borne sub-mm astronomy (e.g., Wiedner et al. 2021) and infrared interferometry (e.g., Linz et al. 2021). As an amalgam of several major trends of modern observational astrophysics, THEZA aims at facilitating a breakthrough in high-resolution high image quality astronomical studies.","Mm- and sub-mm astronomy; Radio interferometry; Spaceborne astrophysics; VLBI","en","conference paper","International Astronautical Federation, IAF","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:4c36a4f0-d434-4748-89aa-b30255bc9010","http://resolver.tudelft.nl/uuid:4c36a4f0-d434-4748-89aa-b30255bc9010","Lower-Thermosphere-ionosphere (LTI) quantities: Current status of measuring techniques and models","Palmroth, Minna (Viikki Biocenter 1; Finnish Meteorological Institute (FMI)); Grandin, Maxime (Viikki Biocenter 1); Sarris, Theodoros (Democritus University of Thrace); Doornbos, Eelco (Royal Netherlands Meteorological Institute (KNMI)); Tourgaidis, Stelios (Democritus University of Thrace; Athena Research and Innovation Centre); March, G. (TU Delft Astrodynamics & Space Missions); Siemes, C. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2021","The lower-Thermosphere-ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric part of the LTI is dominated by laws of continuum fluid dynamics and chemistry, while the ionosphere is a plasma system controlled by electromagnetic forces driven by the magnetosphere, the solar wind, as well as the wind dynamo. The LTI is hence a domain controlled by many different physical processes. However, systematic in situ measurements within this region are severely lacking, although the LTI is located only 80 to 200 km above the surface of our planet. This paper reviews the current state of the art in measuring the LTI, either in situ or by several different remote-sensing methods. We begin by outlining the open questions within the LTI requiring high-quality in situ measurements, before reviewing directly observable parameters and their most important derivatives. The motivation for this review has arisen from the recent retention of the Daedalus mission as one among three competing mission candidates within the European Space Agency (ESA) Earth Explorer 10 Programme. However, this paper intends to cover the LTI parameters such that it can be used as a background scientific reference for any mission targeting in situ observations of the LTI.
.","","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:f9a77c51-f130-4cb7-b22b-b291af8a7a10","http://resolver.tudelft.nl/uuid:f9a77c51-f130-4cb7-b22b-b291af8a7a10","Integration of solid oxide fuel cell and internal combustion engine for maritime applications","Sapra, H.D. (TU Delft Ship Design, Production and Operations); Stam, J.N. (TU Delft Energy Technology); Reurings, Jeroen (Ministry of Defence); van Biert, L. (TU Delft Ship Design, Production and Operations); van Sluijs, Wim (Pon Power Nederland); de Vos, P. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (TU Delft Energy Technology); Hopman, J.J. (TU Delft Marine and Transport Technology)","","2021","The current literature on solid oxide fuel cell and internal combustion engine (SOFC-ICE) integration is focused on the application of advanced combustion technologies operating as bottoming cycles to generate a small load share. This integration approach can pose challenges for ships such as restricted dynamic capabilities and large space and weight requirements. Furthermore, the potential of SOFC-ICE integration for marine power generation has not been explored. Consequently, the current work proposes a novel approach of SOFC-ICE integration for maritime applications, which allows for high-efficiency power generation while the SOFC anode-off gas (AOG) is blended with natural gas (NG) and combusted in a marine spark-ignited (SI) engine for combined power generation. The objective of this paper is to investigate the potential of the proposed SOFC-ICE integration approach with respect to system efficiency, emissions, load sharing, space and weight considerations and load response. In this work, a verified zero-dimensional (0-D) SOFC model, engine experiments and a validated AOG-NG mean value engine model is used. The study found that the SOFC-ICE integration, with a 67–33 power split at 750 kWe power output, yielded the highest efficiency improvement of 8.3% over a conventional marine natural gas engine. Simulation results showed that promising improvements in efficiency of 5.2%, UHC and NOx reductions of about 30% and CO2 reductions of about 12% can be achieved from a 33–67 SOFC-ICE power split with comparatively much smaller increments in size and weight of 1.7 times. Furthermore, the study concluded that in the proposed SOFC-ICE system for maritime applications, a power split that favours the ICE would significantly improve the dynamic capabilities of the combined system and that the possible sudden and large load changes can be met by the ICE.","Combined cycle; Dynamic load response; Experiments; Maritime; Modelling and simulations; SOFC-ICE integration","en","journal article","","","","","","","","","","Marine and Transport Technology","Ship Design, Production and Operations","","",""
"uuid:b912879e-859a-4e4d-a4b1-005363811eae","http://resolver.tudelft.nl/uuid:b912879e-859a-4e4d-a4b1-005363811eae","Intrinsically typed compilation with nameless labels","Rouvoet, A.J. (TU Delft Programming Languages); Krebbers, R.J. (TU Delft Programming Languages; Radboud Universiteit Nijmegen); Visser, Eelco (TU Delft Programming Languages)","","2021","To avoid compilation errors it is desirable to verify that a compiler is type correct-i.e., given well-typed source code, it always outputs well-typed target code. This can be done intrinsically by implementing it as a function in a dependently typed programming language, such as Agda. This function manipulates data types of well-typed source and target programs, and is therefore type correct by construction. A key challenge in implementing an intrinsically typed compiler is the representation of labels in bytecode. Because label names are global, bytecode typing appears to be inherently a non-compositional, whole-program property. The individual operations of the compiler do not preserve this property, which requires the programmer to reason about labels, which spoils the compiler definition with proof terms. In this paper, we address this problem using a new nameless and co-contextual representation of typed global label binding, which is compositional. Our key idea is to use linearity to ensure that all labels are defined exactly once. To write concise compilers that manipulate programs in our representation, we develop a linear, dependently typed, shallowly embedded language in Agda, based on separation logic. We show that this language enables the concise specification and implementation of intrinsically typed operations on bytecode, culminating in an intrinsically typed compiler for a language with structured control-flow.","Agda; Co-contextual typing; Code transformations; Compilation; Dependent types; Intrinsically typed; Nameless; Proof relevance; Type safety","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:7e298ebd-799c-4f8a-a312-13d6ebfb90f9","http://resolver.tudelft.nl/uuid:7e298ebd-799c-4f8a-a312-13d6ebfb90f9","Use of fine recycled concrete aggregates in concrete: A critical review","Nedeljković, Marija (TU Delft Materials and Environment; TNO); Visser, Jeanette (TNO); Šavija, B. (TU Delft Materials and Environment); Valcke, Siska (TNO); Schlangen, E. (TU Delft Materials and Environment)","","2021","This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and durability of concretes with fRCA. Based on the systematic review of the published literature, it is impossible to deduce without any further research the guidelines and tools to introduce the widespread application of the fRCA in new concrete whilst keeping the cement contents at least the same or preferably lower. Namely, what is still missing is knowledge on key physico-chemical properties and their relation to the quality of the concrete mix and the concrete performance. This paper sets the foundations for better understanding the quality of fRCA obtained either from parent concrete specifically produced in the laboratory, with controlled crushing and sieving of the recycled aggregates or from field structures. By comparing properties of fRCA with properties of fine natural aggregates, the key limiting properties of fRCA are identified as the high water absorption of fRCA, moisture state of fRCA, agglomeration of particles and adhered mortar. As such, continuous quality of fRCA is hard to be obtained, even though they may be more continuous in terms of chemistry. Advanced characterization techniques and concrete technology tools are needed to account for limiting properties of fRCA in concrete mix design.","Concrete mix design; Durability; Engineering properties; Fine natural aggregates; Fine recycled concrete aggregates; Quality indicators","en","review","","","","","","","","","","","Materials and Environment","","",""
"uuid:7f0c1dae-9f6b-41bd-a7c2-ae6efc53e1ff","http://resolver.tudelft.nl/uuid:7f0c1dae-9f6b-41bd-a7c2-ae6efc53e1ff","The BRAF P.V600E Mutation Status of Melanoma Lung Metastases Cannot Be Discriminated on Computed Tomography by LIDC Criteria nor Radiomics Using Machine Learning","Angus, Lindsay (Erasmus MC); Starmans, M.P.A. (Erasmus MC); Rajicic, Ana (Erasmus MC); Odink, Arlette E. (Erasmus MC); Jalving, Mathilde (University Medical Center Groningen); Niessen, W.J. (TU Delft ImPhys/Medical Imaging; TU Delft ImPhys/Computational Imaging; Erasmus MC); Visser, Jacob J. (Erasmus MC); Sleijfer, Stefan (Erasmus MC); Klein, Stefan (Erasmus MC); van der Veldt, Astrid A.M. (Erasmus MC)","","2021","Patients with BRAF mutated (BRAF-mt) metastatic melanoma benefit significantly from treatment with BRAF inhibitors. Currently, the BRAF status is determined on archival tumor tissue or on fresh tumor tissue from an invasive biopsy. The aim of this study was to evaluate whether radiomics can predict the BRAF status in a non-invasive manner. Patients with melanoma lung metastases, known BRAF status, and a pretreatment computed tomography scan were included. After semi-automatic annotation of the lung lesions (maximum two per patient), 540 radiomics features were extracted. A chest radiologist scored all segmented lung lesions according to the Lung Image Database Consortium (LIDC) criteria. Univariate analysis was performed to assess the predictive value of each feature for BRAF mutation status. A combination of various machine learning methods was used to develop BRAF decision models based on the radiomics features and LIDC criteria. A total of 169 lung lesions from 103 patients (51 BRAF-mt; 52 BRAF wild type) were included. There were no features with a significant discriminative value in the univariate analysis. Models based on radiomics features and LIDC criteria both performed as poorly as guessing. Hence, the BRAF mutation status in melanoma lung metastases cannot be predicted using radiomics features or visually scored LIDC criteria.","Lung neoplasm/metastases; Machine learning; Melanoma; Proto-oncogene proteins B-raf; Tomography; X-ray computed","en","journal article","","","","","","","","","","","ImPhys/Medical Imaging","","",""
"uuid:f5a91615-6a33-4e6f-9753-82068dd7ec97","http://resolver.tudelft.nl/uuid:f5a91615-6a33-4e6f-9753-82068dd7ec97","Dual-contrast computed tomography enables detection of equine posttraumatic osteoarthritis in vitro","Saukko, Annina E.A. (University of Eastern Finland; Turku University Hospital, Kuopio); Nykänen, Olli (University of Eastern Finland; University of Oulu); Sarin, Jaakko K. (University of Eastern Finland; Kuopio University Hospital); Nissi, Mikko J. (University of Eastern Finland; University of Oulu); te Moller, Nikae C.R. (Universiteit Utrecht); Weinans, Harrie (TU Delft Biomaterials & Tissue Biomechanics; University Medical Center Utrecht); Mancini, Irina A.D. (Universiteit Utrecht); Visser, Jetze (University Medical Center Utrecht); Brommer, Harold (Universiteit Utrecht)","","2021","To prevent the progression of posttraumatic osteoarthritis, assessment of cartilage composition is critical for effective treatment planning. Posttraumatic changes include proteoglycan (PG) loss and elevated water content. Quantitative dual-energy computed tomography (QDECT) provides a means to diagnose these changes. Here, we determine the potential of QDECT to evaluate tissue quality surrounding cartilage lesions in an equine model, hypothesizing that QDECT allows detection of posttraumatic degeneration by providing quantitative information on PG and water contents based on the partitions of cationic and nonionic agents in a contrast mixture. Posttraumatic osteoarthritic samples were obtained from a cartilage repair study in which full-thickness chondral defects were created surgically in both stifles of seven Shetland ponies. Control samples were collected from three nonoperated ponies. The experimental (n = 14) and control samples (n = 6) were immersed in the contrast agent mixture and the distributions of the agents were determined at various diffusion time points. As a reference, equilibrium moduli, dynamic moduli, and PG content were measured. Significant differences (p < 0.05) in partitions between the experimental and control samples were demonstrated with cationic contrast agent at 30 min, 60 min, and 20 h, and with non-ionic agent at 60 and 120 min. Significant Spearman's rank correlations were obtained at 20 and 24 h (ρ = 0.482–0.693) between the partition of cationic contrast agent, cartilage biomechanical properties, and PG content. QDECT enables evaluation of posttraumatic changes surrounding a lesion and quantification of PG content, thus advancing the diagnostics of the extent and severity of cartilage injuries.","articular cartilage; cationic contrast agent; contrast-enhanced computed tomography; dual-contrast agent; dual-energy computed tomography; posttraumatic osteoarthritis","en","journal article","","","","","","","","","","","Biomaterials & Tissue Biomechanics","","",""
"uuid:e74302ab-9ef3-4f47-9cfd-14de2b8d873f","http://resolver.tudelft.nl/uuid:e74302ab-9ef3-4f47-9cfd-14de2b8d873f","Performance of the Emprint and Amica Microwave Ablation Systems in ex vivo Porcine Livers: Sphericity and Reproducibility Versus Size","Hendriks, P. (Leiden University Medical Center); Berkhout, W. E.M. (Leiden University Medical Center); Kaanen, C.I. (Leiden University Medical Center); Sluijter, J.H. (Leiden University Medical Center); Visser, I. J. (Leiden University Medical Center); van den Dobbelsteen, J.J. (TU Delft Medical Instruments & Bio-Inspired Technology); de Geus-Oei, L. F. (Leiden University Medical Center; University of Twente); Webb, A. (Leiden University Medical Center); Burgmans, M.C. (Leiden University Medical Center)","","2021","Purpose: To investigate the performance of two microwave ablation (MWA) systems regarding ablation volume, ablation shape and variability. Materials and Methods: In this ex vivo study, the Emprint and Amica MWA systems were used to ablate porcine livers at 4 different settings of time and power (3 and 5 minutes at 60 and 80 Watt). In total, 48 ablations were analysed for ablation size and shape using Vitrea Advanced Visualization software after acquisition of a 7T MRI scan. Results: Emprint ablations were smaller (11,1 vs. 21,1 mL p < 0.001), more spherical (sphericity index of 0.89 vs. 0.59 p < 0.001) and showed less variability than Amica ablations. In both systems, longer ablation time and higher power resulted in significantly larger ablation volumes. Conclusion: Emprint ablations were more spherical, and the results showed a lower variability than those of Amica ablations. This comes at the price of smaller ablation volumes.","Ablation volume; Amica; Emprint; Microwave ablation; Sphericity; Variability","en","journal article","","","","","","","","","","","Medical Instruments & Bio-Inspired Technology","","",""
"uuid:f3c6d6c6-3f78-433b-81a1-c37d9d3a1460","http://resolver.tudelft.nl/uuid:f3c6d6c6-3f78-433b-81a1-c37d9d3a1460","Hybrid sol-gel coatings applied on anodized AA2024-T3 for active corrosion protection","del Olmo, R. (Universidad Complutense de Madrid); Tiringer, U. (TU Delft Team Arjan Mol); Milošev, I. (Jozef Stefan Institute); Visser, P. (Akzo Nobel); Arrabal, R. (Universidad Complutense de Madrid); Matykina, E. (Universidad Complutense de Madrid); Mol, J.M.C. (TU Delft Team Arjan Mol)","","2021","The effect of the presence of an anodic film and hybrid sol-gel coating loaded with corrosion inhibitors was evaluated as a strategy for enhanced barrier and active corrosion protection of aluminium alloy 2024-T3. In this study, AA2024-T3 specimens were anodized in a modified sulphuric-citric acid bath (SCA) as the first layer of a corrosion protective multilayer system and subsequently protected by the application of silica-based hybrid sol-gel coatings. These coatings were doped with LiNO3 and Ce(NO3)3 as corrosion inhibitors and studied in comparison with the inhibitor-free sol-gel coating in terms of morphology, composition and corrosion protection of intact and scribed specimens. The anodized AA2024-T3 with an overlaying inhibitor-free sol-gel coating showed the highest impedance modulus during long-term immersion in 0.1 mol·L−1 NaCl aqueous solution. Active corrosion protection of scribed coated specimens was studied by exposure to a 0.5 mol·L−1 NaCl solution and evaluated by surface analytical techniques. The addition of Li- and Ce-based salts into the hybrid sol-gel formulation showed active corrosion protection compared to the inhibitor-free scribed hybrid sol-gel coating. The Ce-doped sol-gel coating showed less visual corrosion and higher active corrosion protection than the Li-containing one during the long-term immersion test in 0.5 mol·L−1 NaCl. Present findings reveal that the combination of the anodic/hybrid sol-gel layers on AA2024-T3 enhances the corrosion protective properties barrier properties of both stand-alone systems and the incorporation of Li- and Ce-based inhibitors provide active corrosion.","AA2024-T3; Active corrosion protection; Anodizing; Corrosion inhibitor; Sol-gel coating","en","journal article","","","","","","","","","","","Team Arjan Mol","","",""
"uuid:07a9b97f-c4c5-4529-af4d-8d1b331b58b5","http://resolver.tudelft.nl/uuid:07a9b97f-c4c5-4529-af4d-8d1b331b58b5","Configuration Space Exploration for Digital Printing Systems","Denkers, J. (TU Delft Programming Languages); Brunner, Marvin (Canon Production Printing B.V.); van Gool, Louis (Canon Production Printing B.V.); Visser, Eelco (TU Delft Programming Languages)","Calinescu, Radu (editor); Păsăreanu, Corina S. (editor)","2021","Within the printing industry, much of the variety in printed applications comes from the variety in finishing. Finishing comprises the processing of sheets of paper after being printed, e.g. to form books. The configuration space of finishers, i.e. all possible configurations given the available features and hardware capabilities, are large. Current control software minimally assists operators in finding useful configurations. Using a classical modelling and integration approach to support a variety of configuration spaces is suboptimal with respect to operatability, development time, and maintenance burden. In this paper, we explore the use of a modeling language for finishers to realize optimizing decision making over configuration parameters in a systematic way and to reduce development time by generating control software from models. We present CSX, a domain-specific language for high-level declarative specification of finishers that supports specification of the configuration parameters and the automated exploration of the configuration space of finishers. The language serves as an interface to constraint solving, i.e., we use low-level SMT constraint solving to find configurations for high-level specifications. We present a denotational semantics that expresses a translation of CSX specifications to SMT constraints. We describe the implementation of the CSX compiler and the CSX programming environment (IDE), which supports well-formedness checking, inhabitance checking, and interactive configuration space exploration. We evaluate CSX by modelling two realistic finishers. Benchmarks show that CSX has practical performance (<1s) for several scenarios of configuration space exploration.","","en","conference paper","Springer","","","","","","","","","","Programming Languages","","",""
"uuid:11b45415-5342-4efa-aaf5-69592076cb3f","http://resolver.tudelft.nl/uuid:11b45415-5342-4efa-aaf5-69592076cb3f","Creating a New Perspective by Integrating Frames Through Design: An Exploratory Research into the What, Why, and How of Integrated Design","Visser, J.L. (TU Delft Integral Design & Management)","Hertogh, M.J.C.M. (promotor); Badke-Schaub, P.G. (promotor); Delft University of Technology (degree granting institution)","2020","Integrated design is a frequently used term in academics and practice. However, a common ground in the application of terminology, methodology, and description of insights from practice with respect to integrated design is lacking. Therefore, this dissertation describes a framework for integrated design that can be used as a platform for discussion and development. The framework is the result of the exploratory research into the what, why, and how of integrated design, and can be used by anyone who has to deal with integrated design and would like to have more grip on this concept.","","en","doctoral thesis","","978-94-6384-172-6","","","","","","","","","Integral Design & Management","","",""
"uuid:fa6db67a-1a2a-4db3-9f6c-2d14e9398524","http://resolver.tudelft.nl/uuid:fa6db67a-1a2a-4db3-9f6c-2d14e9398524","A multilevel optimization approach to route design and flight allocation taking aircraft sequence and separation constraints into account","Ho-Huu, V. (TU Delft Air Transport & Operations; Ton Duc Thang University); Hartjes, S. (TU Delft Air Transport & Operations); Perez Castan, J.A. (TU Delft Air Transport & Operations; Universidad Politécnica de Madrid); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2020","This paper presents the development of a multilevel optimization framework for the design and selection of departure routes, and the distribution of aircraft movements among these routes, while taking the sequence and separation requirements for aircraft on runways and along selected routes into account. The main aim of the framework is to minimize aircraft noise impact on communities around an airport, and the associated fuel consumption. The proposed framework features two consecutive steps. In the first step, for each given Standard Instrument Departure (SID), multi-objective trajectory optimization is utilized to generate a comprehensive set of possible alternative routes. The obtained set is subsequently used as input for the optimization problem in the second step. In this step, the selection of routes for each SID and the distribution of aircraft movements among these routes are optimized simultaneously. To ensure the feasibility of optimized solutions for an entire operational day, the sequence and separation requirements for aircraft on runways and along selected routes are included in this second phase. In order to address these issues, three novel techniques are developed and added to a previously developed multilevel optimization framework, viz., a runway assignment model, a conflict detection algorithm, and a rerouting technique. The proposed framework is applied to a realistic case study at Amsterdam Airport Schiphol in the Netherlands, in which 599 departure flights and 13 different SIDs are considered. The optimization results show that the proposed model can offer conflict-free solutions, one of which can lead to a reduction in the number of people annoyed of up to 21%, and a reduction in fuel consumption of 8% relative to the reference case solution.","Aircraft allocation; Aircraft noise; Aircraft separation; Airport noise; Conflict detection; Trajectory optimization","en","journal article","","","","","","","","2022-06-25","","","Air Transport & Operations","","",""
"uuid:a48ad4d3-20a1-4ff0-93cf-f56778be51f7","http://resolver.tudelft.nl/uuid:a48ad4d3-20a1-4ff0-93cf-f56778be51f7","Superconducting High-Aspect Ratio Through-Silicon Vias with DC-Sputtered Al for Quantum 3D integration","Alfaro Barrantes, J.A. (TU Delft EKL Processing); Mastrangeli, Massimo (TU Delft Electronic Components, Technology and Materials); Thoen, David (TU Delft Tera-Hertz Sensing); Visser, Sven (SRON Netherlands Institute for Space Research); Bueno Lopez, J. (TU Delft Tera-Hertz Sensing); Baselmans, J.J.A. (TU Delft Tera-Hertz Sensing); Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials)","","2020","This paper presents the fabrication and electrical characterization of superconducting high-aspect ratio through-silicon vias DC-sputtered with aluminum. Fully conformal and void-free coating of 300 μm-deep and 50 μmwide vias with Al, a CMOS-compatible and widely available superconductor, was made possible by tailoring a funneled sidewall profile for the axisymmetric vias. Single-via electric resistance as low as 80.44 mΩ at room temperature and superconductivity below 1.28 K were measured by a crossbridge Kelvin resistor structure. This work thus demonstrates the fabrication of functional superconducting interposer layers, suitable for high-density 3D integration of silicon-based quantum computing architectures.","Aluminum; cryogenic; interconnects; sputtering; superconducting; through-silicon vias","en","journal article","","","","","","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.","","2021-01-31","","","EKL Processing","","",""
"uuid:c5e74433-05bc-4e13-8872-80a0f97a7b69","http://resolver.tudelft.nl/uuid:c5e74433-05bc-4e13-8872-80a0f97a7b69","FlowSpec: A declarative specification language for intra-procedural flow-Sensitive data-flow analysis","Smits, J. (TU Delft Programming Languages); Wachsmuth, G.H. (Oracle Labs); Visser, Eelco (TU Delft Programming Languages)","","2020","Data-flow analysis is the static analysis of programs to estimate their approximate run-time behavior or approximate intermediate run-time values. It is an integral part of modern language specifications and compilers. In the specification of static semantics of programming languages, the concept of data-flow allows the description of well-formedness such as definite assignment of a local variable before its first use. In the implementation of compiler back-ends, data-flow analyses inform optimizations. Data-flow analysis has an established theoretical foundation. What lags behind is implementations of data-flow analysis in compilers, which are usually ad-hoc. This makes such implementations difficult to extend and maintain. In previous work researchers have proposed higher-level formalisms suitable for whole-program analysis in a separate tool, incremental analysis within editors, or bound to a specific intermediate representation. In this paper, we present FlowSpec, an executable formalism for specification of data-flow analysis. FlowSpec is a domain-specific language that enables direct and concise specification of data-flow analysis for programming languages, designed to express flow-sensitive, intra-procedural analyses. We define the formal semantics of FlowSpec in terms of monotone frameworks. We describe the design of FlowSpec using examples of standard analyses. We also include a description of our implementation of FlowSpec. In a case study we evaluate FlowSpec with the static analyses for Green-Marl, a domain-specific programming language for graph analytics.","","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:6252bb29-6613-44d0-8881-fa7ace58530a","http://resolver.tudelft.nl/uuid:6252bb29-6613-44d0-8881-fa7ace58530a","Exploring the response of a resistive soot sensor to AC electric excitation","Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials); Ghaderi, M. (Chalmers University of Technology); Visser, J.H. (Ford Motor Company); Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation; Chalmers University of Technology)","","2020","The resistive particulate matter sensor is a simple device that transduces the presence of soot through impedance change across inter-digital electrodes (IDEs). We investigate the information provided by impedance spectroscopy over the frequency range from 100 Hz to 10 kHz for two purposes. The first is to investigate the opportunities for an improved sensor response to particulate matter (PM), based on the additional information provided by the measurement of both the in-phase (resistive) and out-of-phase (capacitive) components of the change in impedance over this frequency range as compared to DC resistance measurement only. Secondly, the origin of the capacitive response of the device is investigated from the perspective that soot on the device is in the form of bendable dendrites that grow in three dimensions. An IDE structure with the housing acting as an additional suspended electrode for introducing a controllable vertical electric field component has been used for this purpose. The formation of dipoles, due to bending of the charged dendrites, is found to be the source of the capacitive response. Simulation of electrostatic soot deposition reinforces dendritic self-assembly mechanisms, driven by charged particle trajectories along electric field lines. Optical microscopy confirms that dendrites growing out of the substrate plane are sensitive to electric and flow forces, bending when force balances are appropriate. We also apply impedance spectroscopy under varying electric field strengths, showing that capacitive response is only observed when conditions are conducive to dendrite bending in response to the applied AC electric fields.","Aerosol emissions; Dendrite growth; Electrophoresis; Electrostatic soot sensor; Exhaust gas aftertreatment; Impedance spectroscopy; On-board diagnostics; Particulate matter sensing","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:65721ab7-acdb-4527-afde-124f83c0d45d","http://resolver.tudelft.nl/uuid:65721ab7-acdb-4527-afde-124f83c0d45d","Impacts of progressive urban expansion on subsurface temperatures in the city of Amsterdam (The Netherlands)","Visser, P.W. (TU Delft Geo-engineering; Wetsus, European Centre of Excellence for Sustainable Water Technology; KWR Water Research Institute; ARCADIS Nederland); Kooi, Henk (Deltares); Bense, Victor (Wageningen University & Research); Boerma, Emiel (Ministry of Infrastructure and the Environment)","","2020","Subsurface temperatures are substantially higher in urban areas than in surrounding rural environments; the result is a subsurface urban heat island (SUHI). SUHIs and their drivers have received attention in studies world-wide. In this study, a well-constrained data set of subsurface temperatures from Amsterdam, The Netherlands, is presented. The study demonstrates that, through modeling of centuries-long (from fourteenth to twenty-first century) urban development and climate change, along with the history of both the surface urban heat-island temperatures and ground surface temperatures, it is possible to simulate the development and present state of the Amsterdam SUHI. The results provide insight into the drivers of long-term SUHI development, which makes it possible to distinguish subterranean heat sources of more recent times that are localized drivers (such as geothermal energy systems, sewers, boiler basements, subway stations or district heating) from larger-scale drivers (mainly heat loss from buildings and raised ground-surface temperatures due to pavements). Because these findings have consequences for the assessment of the shallow geothermal potential of the SUHIs, it is proposed to distinguish between (1) a regional, long-term SUHI that has developed over centuries due to the larger-scale drivers, and (2) local anomalies caused by anthropogenic heat sources less than one century old.","Geothermal potential; Groundwater temperature; Numerical modeling; Subsurface urban heat island; The Netherlands","en","journal article","","","","","","","","","","","Geo-engineering","","",""
"uuid:9e31fba2-fad1-43e4-93ac-f7ea3b4cc13c","http://resolver.tudelft.nl/uuid:9e31fba2-fad1-43e4-93ac-f7ea3b4cc13c","Fourier series for eclipses on exoplanet binaries","Visser, P.M. (TU Delft Mathematical Physics); Mol, M.A. (TU Delft Electrical Engineering, Mathematics and Computer Science)","","2020","Context. A double planet system or planet binary undergoes eclipses that modify the reflective light curve. In the time domain, the eclipse events are fast and weak. This would make their signal difficult to find and recognize in the phase light curve, even for small inclinations when eclipses happen frequently. However, due to the quasiperiodic nature of the phenomenon, the Fourier transform of the direct reflection signal consists of a double sum of sharp peaks. These peaks can be resolved for large close binaries and sufficiently long observation times with a star coronagraph. Aims. Eclipses modulate the phase curve, having an orbital period 2π/ω, with a contribution from the relative motion in the binary plane of a period 2π/Ω. This leads to a spectral structure with basis frequencies ω and Ω. We aim to characterize these spectra. Methods. We studied the regime of short eclipses that occur when the planet radii are small compared to the planet separation. We derived formulas for the peak amplitudes applicable to homogeneous (Lambertian) planet binaries in circular orbit with small inclination. Results. The effects of an eclipse and of double reflection appear as first- and second-order contributions (in planet radius over separation) in the reflection signal, respectively. Small peaks appear as observable side bands in the spectrum. Identical structures around mΩ are characteristic of short-duration eclipses. Deceasing side bands could indicate double reflection between companions. Conclusions. Fourier analysis of the light curve of non-transiting planets can be used to find planets and their moons. Difficulties in interpreting the structures arise for small planet separation and when there are several moons in mean-motion resonance.","Moon; eclipses; Planets and satellites: detection; methods: analytical; techniques: interferometric; techniques: photometric","en","journal article","","","","","","accepted author manuscript","","","Electrical Engineering, Mathematics and Computer Science","","Mathematical Physics","","",""
"uuid:913a5c7f-d521-445e-82af-a7771849f964","http://resolver.tudelft.nl/uuid:913a5c7f-d521-445e-82af-a7771849f964","Intrinsically-Typed Definitional Interpreters for Linear, Session-Typed Languages","Rouvoet, A.J. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Krebbers, R.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2020","An intrinsically-typed definitional interpreter is a concise specification of dynamic semantics, that is executable and type safe by construction. Unfortunately, scaling intrinsically-typed definitional interpreters to more complicated object languages often results in definitions that are cluttered with manual proof work. For linearly-typed languages (including session-typed languages) one has to prove that the interpreter, as well as all the operations on semantic components, treat values linearly. We present new methods and tools that make it possible to implement intrinsically-typed definitional interpreters for linearly-typed languages in a way that hides the majority of the manual proof work. Inspired by separation logic, we develop reusable and composable abstractions for programming with linear operations using dependent types. Using these abstractions, we define interpreters for linear lambda calculi with strong references, concurrency, and session-typed communication in Agda","Agda; Definitional interpreters; Dependent types; Linear types; Mechanized semantics; Separation logic; Session types; Type safety","en","working paper","ACM DL","978-1-4503-7097-4","","","","","","","","","Programming Languages","","",""
"uuid:d36fccbd-8743-4c36-99ce-f52045ad1fda","http://resolver.tudelft.nl/uuid:d36fccbd-8743-4c36-99ce-f52045ad1fda","Application of in-situ liquid cell transmission electron microscopy in corrosion studies: a critical review of challenges and achievements","Kosari, A. (TU Delft (OLD) MSE-6); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau); Visser, P. (TU Delft (OLD) MSE-6); Terryn, H.A. (TU Delft (OLD) MSE-6); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2020","Identifying corrosion initiation events in metals and alloys demands techniques that can provide temporal and spatial resolution simultaneously. Transmission electron microscopy (TEM) enables one to obtain microstructural and chemical descriptors of materials at atomic/nanoscopic level and has been used in corrosion studies of many metal-electrolyte combinations. Conventionally, ex situ and quasi in situ TEM studies of pre- and post-corroded samples were performed, but possible experimental artifacts such as dehydrated surfaces might not fully represent the real interfacial conditions as compared to those when actually immersed in the electrolyte. Recent advances in liquid cell transmission electron microscopy (LC-TEM) allows for in situ monitoring morphological and even compositional evolutions in materials resulting from interaction with gas or liquid environments. Corrosion science, as a challenging field of research, can benefit from this unparalleled opportunity to investigate many complicated corroding systems in aqueous environments at high resolution. However, “real life” corrosion with LC-TEM is still not straightforward in implementation and there are limitations and challenging experimental considerations for conducting reliable examinations. Thus, this study has been devoted to discussing the challenges of in situ LC-TEM wherein state-of-the-art achievements in the field of relevance are reviewed.","aqueous corrosion; electron beam effect; initiation events; in situ liquid cell TEM; specimen preparation; (S)TEM imaging mode","en","review","","","","","","Accepted Author Manuscript","","2020-02-02","","","(OLD) MSE-6","","",""
"uuid:b5a77843-33bb-4caf-941b-50a5cc5a57d7","http://resolver.tudelft.nl/uuid:b5a77843-33bb-4caf-941b-50a5cc5a57d7","Evolution of the WebDSL runtime: Reliability engineering of the WebDSL web programming language","Groenewegen, D.M. (TU Delft Programming Languages); van Chastelet, E. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Aguiar, Ademar (editor); Chiba, Shigeru (editor); Boix, Elisa Gonzalez (editor)","2020","Web applications are ideal for implementing information systems; they can organize and persist the data in a database, do not require installation on client machines, and can be instantly updated everywhere. However, web programming is complex due to its heterogeneous nature, causing web frameworks to suffer from insufficient or leaky abstraction, weak static consistency checking, and security features that are not enforced. We developed the WebDSL web programming language, which supports direct expression of intent, strong static consistency checking, linguistic abstractions for web programming concerns, and automatically enforces security features for web applications. We have used WebDSL for over 10 years to create information systems for academic workflows with thousands of users. Based on our experiences with these applications, we improved the WebDSL compiler and runtime to increase robustness, performance, and security of applications. In this experience report, we reflect on the lessons learned and improvements made to the language runtime.","compilers; domain-specific languages; experience report; integrated development environments; web applications; web programming; web security","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:ba33cb44-6547-401d-b1a2-1cb0a83a0221","http://resolver.tudelft.nl/uuid:ba33cb44-6547-401d-b1a2-1cb0a83a0221","Impedance Spectroscopy for Enhanced Data Collection of Conductometric Soot Sensors","Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials); Ghaderi, Mohammadamir (Chalmers University of Technology); Bilby, David (Ford Motor Company); Visser, J.H. (Ford Motor Company); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials); Wolffenbuttel, R.F. (Chalmers University of Technology)","","2020","Impedance spectroscopy in the frequency range 100 Hz to 10 kHz has been applied to the Inter-Digitated Electrode (IDE) structure that is conventionally operated as a resistive sensor for the measurement of Particulate Matter (PM). The measurement of both the in-phase (resistive) and out-of-phase (capacitive) components of the impedance over this frequency range provides more data on PM as compared to DC resistance measurement only. Experimental validation confirms a more gradual change in capacitance with soot buildup as compared to the sudden reduction of resistance with dendrite formation. The effect of an additional vertical electric field for an increased capacitive sensitivity due to stimulated soot buildup has been experimentally investigated using the electrically conductive flow housing of the IDE structure as an additional suspended electrode.","Particulate matter sensing; exhaust gas after-treatment; impedance spectroscopy; on-board diagnostics; resistive soot sensor","en","conference paper","IEEE","","","","","Virtual/online event due to COVID-19","","","","","Electronic Components, Technology and Materials","","",""
"uuid:ec4a8679-daab-40bf-b4fc-170f1dd3e2fe","http://resolver.tudelft.nl/uuid:ec4a8679-daab-40bf-b4fc-170f1dd3e2fe","Constructing Hybrid Incremental Compilers for Cross-Module Extensibility with an Internal Build System","Smits, J. (TU Delft Programming Languages); Konat, G.D.P. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2020","Context Compilation time is an important factor in the adaptability of a software project. Fast recompilation enables cheap experimentation with changes to a project, as those changes can be tested quickly. Separate and incremental compilation has been a topic of interest for a long time to facilitate fast recompilation. Inquiry Despite the benefits of an incremental compiler, such compilers are usually not the default. This is because incrementalization requires cross-cutting, complicated, and error-prone techniques such as dependency tracking, caching, cache invalidation, and change detection. Especially in compilers for languages with cross-module definitions and integration, correctly and efficiently implementing an incremental compiler can be a challenge. Retrofitting incrementality into a compiler is even harder. We address this problem by developing a compiler design approach that reuses parts of an existing non-incremental compiler to lower the cost of building an incremental compiler. It also gives an intuition into compiling difficult-to-incrementalize language features through staging. Approach We use the compiler design approach presented in this paper to develop an incremental compiler for the Stratego term-rewriting language. This language has a set of features that at first glance look incompatible with incremental compilation. Therefore, we treat Stratego as our critical case to demonstrate the approach on. We show how this approach decomposes the original compiler and has a solution to compile Stratego incrementally. The key idea on which we build our incremental compiler is to internally use an incremental build system to wire together the components we extract from the original compiler. Knowledge The resulting compiler is already in use as a replacement of the original whole-program compiler. We find that the incremental build system inside the compiler is a crucial component of our approach. This allows a compiler writer to think in multiple steps of compilation, and combine that into an incremental compiler almost effortlessly. Normally, separate compilation à la C is facilitated by an external build system, where the programmer is responsible for managing dependencies between files. We reuse an existing sound and optimal incremental build system, and integrate its dependency tracking into the compiler. Grounding The incremental compiler for Stratego is available as an artefact along with this article. We evaluate it on a large Stratego project to test its performance. The benchmark replays edits to the Stratego project from version control. These benchmarks are part of the artefact, packaged as a virtual machine image for easy reproducibility. Importance Although we demonstrate our design approach on the Stratego programming language, we also describe it generally throughout this paper. Many currently used programming languages have a compiler that is much slower than necessary. Our design provides an approach to change this, by reusing an existing compiler and making it incremental within a reasonable amount of time.","separate compilation; incremental compilation; extensible language definition; stratego; term rewriting","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:f53e9398-8fc2-4634-8e3d-e19314e29e9d","http://resolver.tudelft.nl/uuid:f53e9398-8fc2-4634-8e3d-e19314e29e9d","Gradually typing strategies","Smits, J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2020","The Stratego language supports program transformation by means of term rewriting with programmable rewriting strategies. Stratego's traversal primitives support concise definition of generic tree traversals. Stratego is a dynamically typed language because its features cannot be captured fully by a static type system. While dynamic typing makes for a flexible programming model, it also leads to unintended type errors, code that is harder to maintain, and missed opportunities for optimization. In this paper, we introduce a gradual type system for Stratego that combines the flexibility of dynamically typed generic programming, where needed, with the safety of statically declared and enforced types, where possible. To make sure that statically typed code cannot go wrong, all access to statically typed code from dynamically typed code is protected by dynamic type checks (casts). The type system is backwards compatible such that types can be introduced incrementally to existing Stratego programs. We formally define a type system for Core Gradual Stratego, discuss its implementation in a new type checker for Stratego, and present an evaluation of its impact on Stratego programs.","generic programming; gradual types; strategy; type preserving","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:2fd8de7a-5599-43ea-8e52-dcfe0b7acbb8","http://resolver.tudelft.nl/uuid:2fd8de7a-5599-43ea-8e52-dcfe0b7acbb8","A comparison of steam reforming concepts in solid oxide fuel cell systems","van Biert, L. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (TU Delft Energy Technology)","","2020","Various concepts have been proposed to use hydrocarbon fuels in solid oxide fuel cell (SOFC) systems. A combination of either allothermal or adiabatic pre-reforming and water recirculation (WR) or anode off-gas recirculation (AOGR) is commonly used to convert the fuel into a hydrogen rich mixture before it is electrochemically oxidised in the SOFC. However, it is unclear how these reforming concepts affect the electrochemistry and temperature gradients in the SOFC stack. In this study, four reforming concepts based on either allothermal or adiabatic pre-reforming and either WR or AOGR are modelled on both stack and system level. The electrochemistry and temperature gradients in the stack are simulated with a one-dimensional SOFC model, and the results are used to calculate the corresponding system efficiencies. The highest system efficiencies are obtained with allothermal pre-reforming and WR. Adiabatic pre-reforming and AOGR result in a higher degree of internal reforming, which reduces the cell voltage compared to allothermal pre-reforming and WR. Although this lowers the stack efficiency, higher degrees of internal reforming reduce the power consumption by the cathode air blower as well, leading to higher system efficiencies in some cases. This illustrates that both stack and system operation need to be considered to design an efficient SOFC system and predict potentially deteriorating temperature gradients in the stack.","Adiabatic reforming; Allothermal reforming; Anode off-gas recirculation; Solid oxide fuel cell; Thermal stress; Water recirculation","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:eb9e1ea6-e094-4d47-8250-c57678d8f86a","http://resolver.tudelft.nl/uuid:eb9e1ea6-e094-4d47-8250-c57678d8f86a","Hydrogen-natural gas combustion in a marine lean-burn SI engine: A comparitive analysis of Seiliger and double Wiebe function-based zero–dimensional modelling","Sapra, H.D. (TU Delft Ship Design, Production and Operations); Godjevac, M. (Allseas Engineering); de Vos, P. (TU Delft Ship Design, Production and Operations); Van Sluijs, Wim (Pon Power Nederland); Linden, Youri (Student TU Delft); Visser, K. (TU Delft Ship Design, Production and Operations)","","2020","With increasingly stringent emission regulations, marine natural gas engines need to improve their performance. Various proven advantages of hydrogen-natural gas (H-NG) blends make them a promising enhanced fuel solution. Although modelling of H-NG combustion has been investigated before, mostly using CFD models, the literature on the modelling capabilities of Seiliger-based and Wiebe-based zero-dimensional (0-D) models is limited for H-NG combustion. Especially for the application of marine lean-burn spark-ignited (SI) engines. Therefore, the aim of this paper is to compare the capabilities of Seiliger-based and double Wiebe function-based 0-D models to capture H-NG combustion in a marine SI engine for different H-NG fuel blends, engine leaning (lean-burn operation) and engine loads. In this work, measurements on a turbocharged, SI marine natural gas engine were used to develop a heat release rate model, which was subsequently used as a basis for the Seiliger and double Wiebe function-based H-NG combustion characterization models. Results from the two combustion modelling approaches were compared for different H-NG fuel blends, engine leaning (lean-burn operation) and engine loads. The modelling results were also compared against engine measurements for different experimental conditions. This paper shows that the Seiliger modelling approach can be used to define different physical phenomenon in H-NG combustion, while accurately capturing the effects of hydrogen addition and engine leaning on the H-NG combustion process at varying engine loads. This research also found that the variations in late burn phase present in lean-burn NG and H-NG combustion can be captured using the double-Wiebe modelling approach, however, clear trends of the Wiebe combustion parameters for varying fuel blends and engine loads could not be identified to accurately capture the H-NG combustion process. Furthermore, Wiebe-based modelling approach produced larger errors in the estimations of work output and combustion heat for all test conditions.","Hydrogen-natural gas; Lean-burn combustion; Marine SI engine; Seiliger model; Wiebe model","en","journal article","","","","","","Accepted Author Manuscript","","2022-02-09","","","Ship Design, Production and Operations","","",""
"uuid:f767ffae-d0d8-447f-8bac-09152700a26f","http://resolver.tudelft.nl/uuid:f767ffae-d0d8-447f-8bac-09152700a26f","Study of TES Detector Transition Curve to Optimize the Pixel Design for Frequency-Division Multiplexing Readout","Ridder, M. L. (SRON Netherlands Institute for Space Research); Nagayoshi, K. (SRON Netherlands Institute for Space Research); Bruijn, M. P. (SRON Netherlands Institute for Space Research); Gottardi, L. (SRON Netherlands Institute for Space Research); Taralli, E. (SRON Netherlands Institute for Space Research); Khosropanah, P. (SRON Netherlands Institute for Space Research); Akamatsu, H. (SRON Netherlands Institute for Space Research); van der Kuur, J. (SRON Netherlands Institute for Space Research); Ravensberg, K. (SRON Netherlands Institute for Space Research); Visser, S. (SRON Netherlands Institute for Space Research); Nieuwenhuizen, A. C.T. (SRON Netherlands Institute for Space Research); Gao, J.R. (TU Delft ImPhys/Optics; SRON Netherlands Institute for Space Research; Kavli institute of nanoscience Delft); den Herder, J. W. (SRON Netherlands Institute for Space Research)","","2020","Superconducting transition-edge sensors (TESs) are highly sensitive detectors. Based on the outstanding performance on spectral resolution, the X-ray integral field unit (X-IFU) instrument on-board athena will be equipped with a large array of TES-based microcalorimeters. For optimal performance in terms of the energy resolution, it is essential to limit undesirable nonlinearity effects in the TES detector. Weak-link behavior induced on the TES by superconducting leads is such a nonlinearity effect. We designed and fabricated smart test structures to study the effect of the superconducting leads on the intrinsic transition curve of our TiAu-based TES bilayer. We measured and analyzed the resistance versus temperature transition curves of the test structures. We found relations of long-distance proximity effects with TES length and different lead materials. Based on these results, we can redesign and further optimize our TES-based X-ray detectors.","Frequency-domain multiplexing; Transition-edge sensors; Weak link","en","journal article","","","","","","Accepted Author Manuscript","","2021-03-07","","","ImPhys/Optics","","",""
"uuid:1abeace8-57aa-40f9-a830-4b15881ba149","http://resolver.tudelft.nl/uuid:1abeace8-57aa-40f9-a830-4b15881ba149","Historic storms and the hidden value of coastal wetlands for nature-based flood defence","Zhu, Zhenchang (Universiteit Utrecht; Guangdong University of Technology; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou); NIOZ Royal Netherlands Institute for Sea Research); Vuik, V. (TU Delft Coastal Engineering; HKV Consultants); Visser, P.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering); Soens, Tim (Universiteit Antwerpen); van Wesenbeeck, B (Deltares); van de Koppel, Johan (Universiteit Utrecht; NIOZ Royal Netherlands Institute for Sea Research); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk); Temmerman, Stijn (Universiteit Antwerpen); Bouma, T.J. (NIOZ Royal Netherlands Institute for Sea Research; Universiteit Utrecht)","","2020","Global change amplifies coastal flood risks and motivates a paradigm shift towards nature-based coastal defence, where engineered structures are supplemented with coastal wetlands such as saltmarshes. Although experiments and models indicate that such natural defences can attenuate storm waves, there is still limited field evidence on how much they add safety to engineered structures during severe storms. Using well-documented historic data from the 1717 and 1953 flood disasters in Northwest Europe, we show that saltmarshes can reduce both the chance and impact of the breaching of engineered defences. Historic lessons also reveal a key but unrecognized natural flood defence mechanism: saltmarshes lower flood magnitude by confining breach size when engineered defences have failed, which is shown to be highly effective even with long-term sea level rise. These findings provide new insights into the mechanisms and benefits of nature-based mitigation of flood hazards, and should stimulate the development of novel safety designs that smartly harness different natural coastal defence functions.","","en","journal article","","","","","","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.","","2020-12-29","","","Coastal Engineering","","",""
"uuid:8595149f-9e21-4119-8f28-65581a19ca66","http://resolver.tudelft.nl/uuid:8595149f-9e21-4119-8f28-65581a19ca66","Maintaining transparency of a heated MEMs membrane for enabling long-term optical measurements on soot-containing exhaust gas","Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials); Ghaderi, Mohammadamir (Chalmers University of Technology); Bilby, David (Ford Motor Company); Visser, Jaco H. (Ford Motor Company); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials); Lundgren, Per (Chalmers University of Technology); Enoksson, Peter (Chalmers University of Technology); Wolffenbuttel, R.F. (Chalmers University of Technology)","","2020","Ensuring optical transparency over a wide spectral range of a window with a view into the tailpipe of the combustion engine, while it is exposed to the harsh environment of sootcontaining exhaust gas, is an essential pre-requisite for introducing optical techniques for long-term monitoring of automotive emissions. Therefore, a regenerable window composed of an optically transparent polysilicon-carbide membrane with a diameter ranging from 100 µm up to 2000 µm has been fabricated in microelectromechanical systems (MEMS) technology. In the first operating mode, window transparency is periodically restored by pulsed heating of the membrane using an integrated resistor for heating to temperatures that result in oxidation of deposited soot (600–700 °C). In the second mode, the membrane is kept transparent by repelling soot particles using thermophoresis. The same integrated resistor is used to yield a temperature gradient by continuous moderate-temperature heating. Realized devices have been subjected to laboratory soot exposure experiments. Membrane temperatures exceeding 500 °C have been achieved without damage to the membrane. Moreover, heating of membranes to ΔT = 40 °C above gas temperature provides sufficient thermophoretic repulsion to prevent particle deposition and maintain transparency at high soot exposure, while non-heated identical membranes on the same die and at the same exposure are heavily contaminated.","Heated silicon carbide window; On-board diagnostics; Optical automotive instrumentation; Optical MEMS; Surface regeneration from soot deposits; Suspended membranes; Thermophoretic repulsion of soot","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:050fdc7a-fc0d-4740-93c7-bcb8fa819e49","http://resolver.tudelft.nl/uuid:050fdc7a-fc0d-4740-93c7-bcb8fa819e49","Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coating","Kosari, A. (TU Delft (OLD) MSE-6); Visser, P. (Akzo Nobel); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Eswara, S. (Luxembourg Institute of Science and Technology); Audinot, J. N. (Luxembourg Institute of Science and Technology); Wirtz, T. (Luxembourg Institute of Science and Technology); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Terryn, H.A. (TU Delft (OLD) MSE-6; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2020","This work focuses on the cross-sectional characterization of the protective conversion layer formed on AA2024-T3 by lithium-leaching from a polyurethane coating in a corrosive environment. The layer shows a multi-layered arrangement comprising nanoscopic local phases. Transmission electron microscopy (TEM) and complementary high-resolution secondary ion mass spectroscopy (SIMS) were employed to observe the cross-sections of the entire layer formed at different locations of a 1-mm-wide scribe, in terms of morphology, structure and chemical composition. The conversion layer was comprised of two ubiquitous sublayers; a thin dense layer (i.e. 150 nm) adjacent the alloy substrate and a porous layer. The former represents an amorphous lithium-containing pseudoboehmite phase, Li-pseudoboehmite, whereas the latter is composed of amorphous and crystalline products; an outer columnar layer merely seen on the peripheral region is also crystalline. Through a sandwich structure and the d(003) basal spacing, the crystalline phases were identified as Li-Al layered double hydroxide. Although lithium was found uniformly spread within different regions, the local phases with no/low concentration of lithium were revealed with energy filtered TEM and confirmed with SIMS analysis.","AA2024-T3; Energy Filtered TEM; High Resolution TEM; Layered double hydroxide; Leachable lithium carbonate; SIMS","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:bd409089-f79d-4bcf-acb3-332a56f65d10","http://resolver.tudelft.nl/uuid:bd409089-f79d-4bcf-acb3-332a56f65d10","Fuel consumption and emissions of ocean-going cargo ship with hybrid propulsion and different fuels over voyage","Sui, Congbiao (TU Delft Ship Design, Production and Operations; Harbin Engineering University); de Vos, P. (TU Delft Ship Design, Production and Operations); Stapersma, D. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Ding, Yu (Harbin Engineering University)","","2020","Hybrid propulsion and using liquefied natural gas (LNG) as the alternative fuel have been applied on automobiles and some small ships, but research investigating the fuel consumption and emissions over the total voyage of ocean-going cargo ships with a hybrid propulsion and different fuels is limited. This paper tries to fill the knowledge gap by investigating the influence of the ship mission profile, propulsion modes and effects of different fuels on the fuel consumption and emissions of the ship over the whole voyage, including transit in open sea and manoeuvring in close-to-port areas. Results show that propulsion control and electric power generation modes have a notable influence on the ship's fuel consumption and emissions during the voyage. During close-to-port manoeuvres, propelling the ship in power-take-in (PTI) mode and generating the electric power by auxiliary engines rather than the main engine will reduce the local NOx and HC (hydrocarbons) emissions significantly. Sailing the ship on LNG will reduce the fuel consumption, CO2 and NOx emissions notably while producing higher HC emissions than traditional fuels. The hybridisation of the ship propulsion and using LNG together with ship voyage optimisation, considering the ship mission, ship operations and sea conditions, will improve the ship's fuel consumption and emissions over the whole voyage significantly.","Electric power generating system; Hybrid propulsion; LNG; Mission profile; Power take off/in; Propulsion control; Ship propulsion system","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:7a442b48-f11c-4988-9326-57bdfa35bf67","http://resolver.tudelft.nl/uuid:7a442b48-f11c-4988-9326-57bdfa35bf67","Differential diagnosis and mutation stratification of desmoid-type fibromatosis on MRI using radiomics","Timbergen, Milea J.M. (Erasmus MC); Starmans, Martijn P.A. (Erasmus MC; Student TU Delft); Padmos, Guillaume A. (Erasmus MC); Grünhagen, Dirk J. (Erasmus MC); van Leenders, Geert J.L.H. (Erasmus MC); Hanff, D. F. (Erasmus MC); Niessen, W.J. (TU Delft ImPhys/Medical Imaging; TU Delft ImPhys/Computational Imaging; Erasmus MC); Klein, S. (Erasmus MC); Visser, J.J. (TU Delft Electrical Engineering, Mathematics and Computer Science; Erasmus MC)","","2020","Purpose: Diagnosing desmoid-type fibromatosis (DTF) requires an invasive tissue biopsy with β-catenin staining and CTNNB1 mutational analysis, and is challenging due to its rarity. The aim of this study was to evaluate radiomics for distinguishing DTF from soft tissue sarcomas (STS), and in DTF, for predicting the CTNNB1 mutation types. Methods: Patients with histologically confirmed extremity STS (non-DTF) or DTF and at least a pretreatment T1-weighted (T1w) MRI scan were retrospectively included. Tumors were semi-automatically annotated on the T1w scans, from which 411 features were extracted. Prediction models were created using a combination of various machine learning approaches. Evaluation was performed through a 100x random-split cross-validation. The model for DTF vs. non-DTF was compared to classification by two radiologists on a location matched subset. Results: The data included 203 patients (72 DTF, 131 STS). The T1w radiomics model showed a mean AUC of 0.79 on the full dataset. Addition of T2w or T1w post-contrast scans did not improve the performance. On the location matched cohort, the T1w model had a mean AUC of 0.88 while the radiologists had an AUC of 0.80 and 0.88, respectively. For the prediction of the CTNNB1 mutation types (S45 F, T41A and wild-type), the T1w model showed an AUC of 0.61, 0.56, and 0.74. Conclusions: Our radiomics model was able to distinguish DTF from STS with high accuracy similar to two radiologists, but was not able to predict the CTNNB1 mutation status.","Aggressive; Beta catenin; Fibromatosis; Machine learning; Magnetic resonance imaging; Radiomics","en","journal article","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","ImPhys/Medical Imaging","","",""
"uuid:91dedb8a-175a-44f7-b614-eb5b21c1e0e3","http://resolver.tudelft.nl/uuid:91dedb8a-175a-44f7-b614-eb5b21c1e0e3","In-situ nanoscopic observations of dealloying-driven local corrosion from surface initiation to in-depth propagation","Kosari, A. (TU Delft (OLD) MSE-6); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Visser, P. (Akzo Nobel); Taheri, P. (TU Delft (OLD) MSE-6); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2020","Dealloying is involved in materials science responsible for fabrication of nanoscale structures beneficially but for corrosion degradations detrimentally. Detailed understanding related to the latter is critical for designing corrosion-resistance alloys and dedicated inhibition systems. Thus, direct nanoscopic observations of nano-structural and compositional evolutions during the process are essential. Here using liquid phase-transmission electron microscopy (LP-TEM), for the first time, we show dynamic evolution of intricate site-specific local corrosion linked to intermetallic particles (IMPs) in aerospace aluminium alloys. To thoroughly probe degradation events, oxidation direction is controlled by purposefully masking thin specimens, allowing for observing top-view surface initiation to cross-sectional depth propagation of local degradations. Real-time capturing validated and supported by post-mortem examinations shows a dealloying-driven process that initiates at IMPs and penetrates into the depth of the alloy, establishing macroscopic corrosion pits. Besides, controversial mechanisms of noble-metal redistribution are finally elucidated.","Aerospace aluminium alloys; Copper redistribution; Dealloying; In-situ liquid-phase TEM; Pitting corrosion","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:14a039a4-679d-4ba9-8a16-f55e66daf161","http://resolver.tudelft.nl/uuid:14a039a4-679d-4ba9-8a16-f55e66daf161","Dealloying-driven local corrosion by intermetallic constituent particles and dispersoids in aerospace aluminium alloys","Kosari, A. (TU Delft (OLD) MSE-6); Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft); Visser, P. (Akzo Nobel); Zandbergen, H.W. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft); Terryn, H.A. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2020","Nanoscopic characterization of heterogeneous intermetallic particles (IMPs) which microstructurally and compositionally evolve during local corrosion is crucial in unravelling the mechanisms and sequence of initial and local corrosion events. Herein, we study site-specific initiation events focused on microscopic constituent intermetallic compounds and nanoscopic dispersoids in AA2024-T3 at the nanoscale using a combined quasi in-situ and ex-situ analytical TEM approach. Our findings show a dealloying-driven local corrosion initiation at the studied IMPs that have been considered as cathodic phases traditionally. Besides, local degradation which is a result of galvanic interactions between dealloyed regions of IMPs and their adjacent alloy matrix is largely governed by the intrinsic electrochemical instability of intermetallic compounds.","Aerospace aluminium alloys; Cross-sectional ex-situ TEM; Dealloying; FIB/SEM analysis; Pitting corrosion; Quasi in-situ TEM","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:02d826ba-aab1-45b3-80dd-c0fefb382e41","http://resolver.tudelft.nl/uuid:02d826ba-aab1-45b3-80dd-c0fefb382e41","Cold atom gravimetry for planetary missions","Müller, Fabian (European Space Agency (ESA)); Carraz, Olivier (European Space Agency (ESA)); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); Witasse, Olivier (European Space Agency (ESA))","","2020","Cold Atom Interferometry (CAI) is a promising new technology for gravity missions, enabling measurements with a potential error level that is several orders of magnitude lower compared to classical electro-static accelerometers. Whereas the latter typically suffer from high noise at low frequencies, with biases and scale factor instabilities, cold atom interferometers give an absolute measurement and are highly accurate over the entire frequency range. Especially for planetary missions, drift-free cold atom interferometry can be highly beneficial, because it does not need any on-board calibration. In this work we present the improvement of using a CAI instrument, with respect to classic Doppler-tracking technique, to retrieve the gravity field of Venus and Mars. In order to estimate the performances with many parameters (orbit altitude, mission duration, sensitivity) a scalar scale factor is proposed to fit a simulated CAI instrument on Earth orbit to other celestial bodies. The spherical harmonic degree strength of the gravitational field retrieval is estimated and the results presented here agree with Fast Error Propagation Tools.","","en","journal article","","","","","","","","2022-10-17","","","Astrodynamics & Space Missions","","",""
"uuid:3de3ee46-06f4-4fb6-a138-06629316d146","http://resolver.tudelft.nl/uuid:3de3ee46-06f4-4fb6-a138-06629316d146","Knowing when to ask: Sound scheduling of name resolution in type checkers derived from declarative specifications","Rouvoet, A.J. (TU Delft Programming Languages); van Antwerpen, H. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Krebbers, R.J. (TU Delft Programming Languages; Radboud Universiteit Nijmegen); Visser, Eelco (TU Delft Programming Languages)","","2020","There is a large gap between the specification of type systems and the implementation of their type checkers, which impedes reasoning about the soundness of the type checker with respect to the specification. A vision to close this gap is to automatically obtain type checkers from declarative programming language specifications. This moves the burden of proving correctness from a case-by-case basis for concrete languages to a single correctness proof for the specification language. This vision is obstructed by an aspect common to all programming languages: name resolution. Naming and scoping are pervasive and complex aspects of the static semantics of programming languages. Implementations of type checkers for languages with name binding features such as modules, imports, classes, and inheritance interleave collection of binding information (i.e., declarations, scoping structure, and imports) and querying that information. This requires scheduling those two aspects in such a way that query answers are stable-i.e., they are computed only after all relevant binding structure has been collected. Type checkers for concrete languages accomplish stability using language-specific knowledge about the type system. In this paper we give a language-independent characterization of necessary and sufficient conditions to guarantee stability of name and type queries during type checking in terms of critical edges in an incomplete scope graph. We use critical edges to give a formal small-step operational semantics to a declarative specification language for type systems, that achieves soundness by delaying queries that may depend on missing information. This yields type checkers for the specified languages that are sound by construction-i.e., they schedule queries so that the answers are stable, and only accept programs that are name-and type-correct according to the declarative language specification. We implement this approach, and evaluate it against specifications of a small module and record language, as well as subsets of Java and Scala.","Name Binding; Static Semantics; Statix; Type Checker; Type Systems","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:8f7ac7d7-047f-4231-b2da-8575c0b61bf6","http://resolver.tudelft.nl/uuid:8f7ac7d7-047f-4231-b2da-8575c0b61bf6","The need for sustainable teleconsultation systems in the aftermath of the first COVID-19 Wave","Giunti, Guido (TU Delft Applied Ergonomics and Design; University of Oulu); Goossens, R.H.M. (TU Delft Applied Ergonomics and Design; TU Delft Human-Centered Design); de Bont, Antoinette (Erasmus Universiteit Rotterdam); Visser, J.J. (Erasmus MC); Mulder, Mark (Erasmus MC); Schuit, Stephanie C.E. (Erasmus MC)","","2020","The physical and social distancing measures that have been adopted worldwide because of COVID-19 will probably remain in place for a long time, especially for senior adults, people with chronic conditions, and other at-risk populations. Teleconsultations can be useful in ensuring that patients continue to receive clinical care while reducing physical crowding and avoiding unnecessary exposure of health care staff. Implementation processes that typically take months of planning, budgeting, pilot testing, and education were compressed into days. However, in the urgency to deal with the present crisis, we may be forgetting that the introduction of digital health is not exclusively a technological issue, but part of a complex organizational change problem. This viewpoint offers insight regarding issues that rapidly adopted teleconsultation systems may face in a post–COVID-19 world.","COVID-19; Digital health; Exposure; Organization; Software; Teleconsultation; Telehealth; Telemedicine; OA-Fund TU Delft","en","journal article","","","","","","","","","","Human-Centered Design","Applied Ergonomics and Design","","",""
"uuid:ba5a74b9-feba-4226-a11f-9949cab59372","http://resolver.tudelft.nl/uuid:ba5a74b9-feba-4226-a11f-9949cab59372","Description of the multi-approach gravity field models from Swarm GPS data","De Teixeira Da Encarnação, J. (TU Delft Astrodynamics & Space Missions; The University of Texas at Austin); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); Arnold, Daniel (University of Bern); Bezdek, Ales (Czech Academy of Sciences and Arts); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions; Royal Netherlands Meteorological Institute (KNMI)); Ellmer, Matthias (California Institute of Technology); Guo, Junyi (Ohio State University); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Iorfida, E. (TU Delft Astrodynamics & Space Missions)","","2020","Although the knowledge of the gravity of the Earth has improved considerably with CHAMP, GRACE, and GOCE (see appendices for a list of abbreviations) satellite missions, the geophysical community has identified the need for the continued monitoring of the time-variable component with the purpose of estimating the hydrological and glaciological yearly cycles and long-term trends. Currently, the GRACE-FO satellites are the sole dedicated provider of these data, while previously the GRACE mission fulfilled that role for 15 years. There is a data gap spanning from July 2017 to May 2018 between the end of the GRACE mission and start the of GRACE-FO, while the Swarm satellites have collected gravimetric data with their GPS receivers since December 2013. We present high-quality gravity field models (GFMs) from Swarm data that constitute an alternative and independent source of gravimetric data, which could help alleviate the consequences of the 10-month gap between GRACE and GRACE-FO, as well as the short gaps in the existing GRACE and GRACE-FO monthly time series. The geodetic community has realized that the combination of different gravity field solutions is superior to any individual model and set up the Combination Service of Time-variable Gravity Fields (COST-G) under the umbrella of the International Gravity Field Service (IGFS), part of the International Association of Geodesy (IAG). We exploit this fact and deliver the highest-quality monthly GFMs, resulting from the combination of four different gravity field estimation approaches. All solutions are unconstrained and estimated independently from month to month. We tested the added value of including kinematic baselines (KBs) in our estimation of GFMs and conclude that there is no significant improvement. The non-gravitational accelerations measured by the accelerometer on board Swarm C were also included in our processing to determine if this would improve the quality of the GFMs, but we observed that is only the case when the amplitude of the non-gravitational accelerations is higher than during the current quiet period in solar activity Using GRACE data for comparison, we demonstrate that the geophysical signal in the Swarm GFMs is largely restricted to spherical harmonic degrees below 12. A 750 km smoothing radius is suitable to retrieve the temporal variations in Earth's gravity field over land areas since mid-2015 with roughly 4 cm equivalent water height (EWH) agreement with respect to GRACE. Over ocean areas, we illustrate that a more intense smoothing with 3000 km radius is necessary to resolve large-scale gravity variations, which agree with GRACE roughly at the level of 1 cm EWH, while at these spatial scales the GRACE observes variations with amplitudes between 0.3 and 1 cm EWH. The agreement with GRACE and GRACE-FO over nine selected large basins under analysis is 0.91 cm, 0.76 cm yr-1, and 0.79 in terms of temporal mean, trend, and correlation coefficient, respectively. The Swarm monthly models are distributed on a quarterly basis at ESA's Earth Swarm Data Access (at https://swarm-diss.eo.esa.int/, last access: 5 June 2020, follow Level2longterm and then EGF) and at the International Centre for Global Earth Models (http://icgem.gfz-potsdam.de/series/02_COST-G/Swarm, last access: 5 June 2020), as well as identified with the DOI https://doi.org/10.5880/ICGEM.2019.006 (Encarnacao et al., 2019).","","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:9ca9558a-cf08-4f46-8d2b-634d15c98a31","http://resolver.tudelft.nl/uuid:9ca9558a-cf08-4f46-8d2b-634d15c98a31","Multi-purpose Syntax Definition with SDF3","de Souza Amorim, L.E. (Australian National University); Visser, Eelco (TU Delft Programming Languages)","de Boer, Frank (editor); Cerone, Antonio (editor)","2020","SDF3 is a syntax definition formalism that extends plain context-free grammars with features such as constructor declarations, declarative disambiguation rules, character-level grammars, permissive syntax, layout constraints, formatting templates, placeholder syntax, and modular composition. These features support the multi-purpose interpretation of syntax definitions, including derivation of type schemas for abstract syntax tree representations, scannerless generalized parsing of the full class of context-free grammars, error recovery, layout-sensitive parsing, parenthesization and formatting, and syntactic completion. This paper gives a high level overview of SDF3 by means of examples and provides a guide to the literature for further details.","Parsing; Programming language; Syntax definition","en","conference paper","Springer","","","","","","","","","","Programming Languages","","",""
"uuid:79581fb2-b445-4392-bee5-2758ac1575a4","http://resolver.tudelft.nl/uuid:79581fb2-b445-4392-bee5-2758ac1575a4","Exploring Short-Term Training Effects of Ecological Interfaces: A Case Study in Air Traffic Control","Borst, C. (TU Delft Control & Simulation); Visser, Roeland M. (Netherlands Airport Consultants, Den Haag); van Paassen, M.M. (TU Delft Control & Simulation); Mulder, Max (TU Delft Control & Simulation)","","2019","In many work domains, the push toward higher levels of automation raises the concern of diminishing human expertise. Ecological interfaces could help operators in retaining and potentially even in acquiring expertise as they are hypothesized to lead to a deeper understanding of the work domain. This study explores the short-term impact of ecological interfaces on knowledge development and compares the results with an instruction-based training method. To monitor and compare students' progress, their decision-making strategies, identified from verbal comments recorded in 'think-aloud' simulator sessions, are mapped onto the decision ladder. This method has been applied to an experiment (N=16) aimed at training novices in conflict detection and resolution (CD&R) within a simplified air traffic control context. Results show that the overall CD&R performance in the final measurement sessions, featuring a transfer manipulation, was not significantly different between the 'ecological' and 'instructional' groups. In terms of cognitive behavior, however, students in the ecological group exhibited more laborious rule- and knowledge-based behaviors that sparked goal-oriented thoughts and corresponding control performances beyond the CD&R task. These findings indicate that ecological interfaces can change how people think and approach a control problem, even after removing the support. It is therefore reasonable to believe that ecological interfaces can play an important role in the early stages of deep knowledge development.","Air traffic control (ATC); ecological interface design (EID); human-machine interface; training","en","journal article","","","","","","","","","","","Control & Simulation","","",""
"uuid:36063bcb-0a9b-4a14-bc36-cb18b43eb413","http://resolver.tudelft.nl/uuid:36063bcb-0a9b-4a14-bc36-cb18b43eb413","Cross-wind from linear and angular satellite dynamics: The GOCE perspective on horizontal and vertical wind in the thermosphere","Visser, T. (TU Delft Astrodynamics & Space Missions)","Visser, P.N.A.M. (promotor); Doornbos, E.N. (promotor); de Visser, C.C. (promotor); Delft University of Technology (degree granting institution)","2019","The decay of satellite orbits has been used extensively to obtain thermospheric density measurements. With the introduction of accelerometers in spacecraft, the spatial resolution of these data could be increased. At the same time, the direction of the measured acceleration provides a measure for the direction of the incoming flow, and therefore of the local cross-wind. In this thesis, the angular acceleration of the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite, an Earth explorer by the European Space Agency (ESA), is used as a source for such thermospheric wind data for the first time. The goal is to improve aerodynamic parameter estimates and assess the quality of accelerometer-derived wind data by comparing this new data set to that derived from linear accelerations...","GOCE; Thermospheric wind; Vertical wind; Satellite angular dynamics","en","doctoral thesis","","978-94-028-1787-4","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:f7fd18aa-ff96-4509-b1f7-f017895596b1","http://resolver.tudelft.nl/uuid:f7fd18aa-ff96-4509-b1f7-f017895596b1","An optimization framework for route design and allocation of aircraft to multiple departure routes","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2019","In this article, we present the development of a two-step optimization framework to deal with the design and selection of aircraft departure routes and the allocation of flights among these routes. The aim of the framework is to minimize cumulative noise annoyance and fuel burn. In the first step of the framework, multi-objective trajectory optimization is used to compute and store a set of routes that will serve as inputs in the second step. In the second step, the selection of routes from the sets of pre-computed optimal routes and the optimal allocation of flights to these routes are conducted simultaneously. To validate the proposed framework, we also conduct an analysis involving an integrated (one-step) approach, in which both trajectory optimization and route allocation are formulated as a single optimization problem. A comparison of both approaches is then performed, and their advantages and disadvantages are identified. The performance and capabilities of the present framework are demonstrated using a case study at Amsterdam Airport Schiphol in The Netherlands. The numerical results show that the proposed framework can generate solutions which can achieve a reduction in the number of people annoyed of up to 31% and a reduction in fuel consumption of 7.3% relative to the reference case solution.","Aircraft allocation; Aircraft noise; Airport noise; Departure routes; Noise abatement; Trajectory optimization","en","journal article","","","","","","","","2021-10-17","","","Air Transport & Operations","","",""
"uuid:0bb0af5f-cdfe-4b66-a08c-d21d7ac2a4ec","http://resolver.tudelft.nl/uuid:0bb0af5f-cdfe-4b66-a08c-d21d7ac2a4ec","Towards language-parametric semantic editor services based on declarative type system specifications","Pelsmaeker, D.A.A. (TU Delft Programming Languages; TU Delft Electrical Engineering, Mathematics and Computer Science); van Antwerpen, H. (TU Delft Programming Languages; TU Delft Applied Sciences); Visser, Eelco (TU Delft Programming Languages)","Smaragdakis, Yannis (editor)","2019","New programming languages often lack good IDE support, as developing advanced semantic editor services takes additional effort. In previous work we discussed the operational requirements of a constraint solver that leverages the declarative type system specification of a language to provide language-parametric semantic editor services. In this work we describe the implementation of our solver as a two stage process: inference and search. An editor-service specific search strategy determines how and where the search is conducted, and when it terminates. We are currently implementing and evaluating this idea.","Constraint programming; Constraint solving; Editor services; Semantics; Spoofax; Statix","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","Programming Languages","","",""
"uuid:f69f4d89-bacf-48c8-b4f1-6b6324b23881","http://resolver.tudelft.nl/uuid:f69f4d89-bacf-48c8-b4f1-6b6324b23881","From definitional interpreter to symbolic executor","Mensing, Adrian D. (Student TU Delft); van Antwerpen, H. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Scholliers, Christophe (editor); Chari, Guido (editor)","2019","Symbolic execution is a technique for automatic software validation and verification. New symbolic executors regularly appear for both existing and new languages and such symbolic executors are generally manually (re)implemented each time we want to support a new language. We propose to automatically generate symbolic executors from language definitions, and present a technique for mechanically (but as yet, manually) deriving a symbolic executor from a definitional interpreter. The idea is that language designers define their language as a monadic definitional interpreter, where the monad of the interpreter defines the meaning of branch points. Developing a symbolic executor for a language is a matter of changing the monadic interpretation of branch points. In this paper, we illustrate the technique on a language with recursive functions and pattern matching, and use the derived symbolic executor to automatically generate test cases for definitional interpreters implemented in our defined language.","Definitional Interpreter; Haskell; Monads; Symbolic Execution","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:8231f372-5cb7-48f0-9cf6-c31f73d9585c","http://resolver.tudelft.nl/uuid:8231f372-5cb7-48f0-9cf6-c31f73d9585c","Trajectory optimization of extended formation flights for commercial aviation","Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Hubar, Marco E.G.van Hellenberg","","2019","This paper presents a trajectory optimization study that has been conducted using a recently developed tool for the synthesis and analysis of extended flight formations of long-haul commercial aircraft, with the aim to minimize overall fuel consumption. In extended flight formations, trailing aircraft can attain an appreciable reduction in induced drag and associated reduction in fuel burn by flying in the upwash of the lead aircraft's wake. In the present study, a previously developed multi-phase optimal control (MOC) framework for the synthesis of two-ship flight formations has been extended to include the assembly of three-ship flight formations. Using the extended tool, various numerical experiments have been conducted in relation to the assembly of two-ship and three-ship flight formations in long-haul operations across the North-Atlantic Ocean. Additionally, numerical experiments have been carried out to examine the impact of wind fields on the synthesis and performance of flight formations. Additionally, a parametric investigation has been conducted to assess the sensitivity of the solutions with respect to the degree of the induced drag reduction that might be attained by the trailing aircraft in a formation. The results of the various numerical experiments reveal that formation flight can result in appreciable reductions in fuel burn in comparison to flying solo-particularly when larger formation strings are permitted.","Flight formations; Fuel burn; Trajectory optimization; Wind fields","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:760c6d31-69b3-4bec-8829-4d4758f56f28","http://resolver.tudelft.nl/uuid:760c6d31-69b3-4bec-8829-4d4758f56f28","Towards language-parametric semantic editor services based on declarative type system specifications","Pelsmaeker, D.A.A. (TU Delft Programming Languages); van Antwerpen, H. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Donaldson, Alastair F. (editor)","2019","Editor services assist programmers to more effectively write and comprehend code. Implementing editor services correctly is not trivial. This paper focuses on the specification of semantic editor services, those that use the semantic model of a program. The specification of refactorings is a common subject of study, but many other semantic editor services have received little attention. We propose a language-parametric approach to the definition of semantic editor services, using a declarative specification of the static semantics of the programming language, and constraint solving. Editor services are specified as constraint problems, and language specifications are used to ensure correctness. We describe our approach for the following semantic editor services: reference resolution, find usages, goto subclasses, code completion, and the extract definition refactoring. We do this in the context of Statix, a constraint language for the specification of type systems. We investigate the specification of editor services in terms of Statix constraints, and the requirements these impose on a suitable solver.","Code completion; Constraint solving; Editor services; Name binding; Refactoring; Reference resolution; Semantics; Statix","en","conference paper","Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing","","","","","","","","","","Programming Languages","","",""
"uuid:a2310b6a-3dbe-4d83-a0f2-fb6a9a104e50","http://resolver.tudelft.nl/uuid:a2310b6a-3dbe-4d83-a0f2-fb6a9a104e50","Scopes and frames improve meta-interpreter specialization","Vergu, V.A. (TU Delft Programming Languages); Tolmach, Andrew (Portland State University); Visser, Eelco (TU Delft Programming Languages)","Donaldson, Alastair F. (editor)","2019","DynSem is a domain-specific language for concise specification of the dynamic semantics of programming languages, aimed at rapid experimentation and evolution of language designs. To maintain a short definition-to-execution cycle, DynSem specifications are meta-interpreted. Meta-interpretation introduces runtime overhead that is difficult to remove by using interpreter optimization frameworks such as the Truffle/Graal Java tools; previous work has shown order-of-magnitude improvements from applying Truffle/Graal to a meta-interpreter, but this is still far slower than what can be achieved with a language-specific interpreter. In this paper, we show how specifying the meta-interpreter using scope graphs, which encapsulate static name binding and resolution information, produces much better optimization results from Truffle/Graal. Furthermore, we identify that JIT compilation is hindered by large numbers of calls between small polymorphic rules and we introduce rule cloning to derive larger monomorphic rules at run time as a countermeasure. Our contributions improve the performance of DynSem-derived interpreters to within an order of magnitude of a handwritten language-specific interpreter.","Definitional interpreters; Partial evaluation","en","conference paper","Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing","","","","","","","","","","Programming Languages","","",""
"uuid:5bfa9cf4-93e0-4b4e-81be-fb970a4271a1","http://resolver.tudelft.nl/uuid:5bfa9cf4-93e0-4b4e-81be-fb970a4271a1","Horizontal and vertical thermospheric cross-wind from GOCE linear and angular accelerations","Visser, T. (TU Delft Astrodynamics & Space Missions); March, G. (TU Delft Astrodynamics & Space Missions); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions); de Visser, C.C. (TU Delft Control & Simulation); Visser, P (TU Delft Astrodynamics & Space Missions)","","2019","Thermospheric wind measurements obtained from linear non-gravitational accelerations of the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite show discrepancies when compared to ground-based measurements. In this paper the cross-wind is derived from both the linear and the angular accelerations using a newly developed iterative algorithm. The two resulting data sets are compared to test the validity of wind derived from angular accelerations and quantify the uncertainty in accelerometer-derived wind data. In general the difference is found to be less than 50 m/s vertically after high-pass filtering, and 100 m/s horizontally. A sensitivity analysis reveals that continuous thrusting is a major source of uncertainty in the torque-derived wind, as are the magnetic properties of the satellite. The energy accommodation coefficient is identified as a particularly promising parameter for improving the consistency of thermospheric cross-wind data sets in the future. The algorithm may be applied to obtain density and cross-wind from other satellite missions that lack accelerometer data, provided the attitude and orbit are known with sufficient accuracy.","Angular accelerations; Gravity field and steady-state Ocean Circulation Explorer (GOCE); Thermospheric wind; Vertical wind","en","journal article","","","","","","","","2021-02-01","","","Astrodynamics & Space Missions","","",""
"uuid:dcf9932a-3391-480a-a900-b2697d796d9e","http://resolver.tudelft.nl/uuid:dcf9932a-3391-480a-a900-b2697d796d9e","Active corrosion protection of aerospace aluminium alloys by lithium-leaching coatings","Visser, P. (TU Delft (OLD) MSE-6)","Mol, J.M.C. (promotor); Terryn, H.A. (promotor); Delft University of Technology (degree granting institution)","2019","For decades, scientists and engineers are searching for a safe and environmentally friendly alternative for the toxic chromate corrosion inhibitors in active protective coatings for the protection of aerospace aluminium alloys. In this search many different compounds have been investigated as leachable corrosion inhibitor, but no alternative with equal or better performance compared to chromates has been found yet. In 2010 it was discovered that organic coatings loaded with lithium-salts (Li) as leachable corrosion inhibitor provided very effective and promising corrosion inhibition on aluminium alloys when exposed to industrial accelerated corrosion tests. Initial investigations showed the formation of a corrosion protective layer on the aluminium alloy in a defect area, which appears to be a key feature of these Li-leaching coatings.","Aluminium; Cr(VI)-free; Lithium; Active Protective Coatings; Corrosion Protection; Leaching","en","doctoral thesis","","978-94-6380-267-3","","","","","","","","","(OLD) MSE-6","","",""
"uuid:0e7a5bb9-25f6-4faa-a09f-aaa36c69e8a9","http://resolver.tudelft.nl/uuid:0e7a5bb9-25f6-4faa-a09f-aaa36c69e8a9","Formulating Design Recommendations for the Acceptance of the Use and Results of Point-of-Care Testing in Low- and Middle-Income Countries: A Literature Review","Licher, Yvonne (Student TU Delft); Visser, Jan Simon (Student TU Delft); Van, G.Y. (TU Delft Design for Sustainability); Diehl, J.C. (TU Delft Design for Sustainability)","Badke Schaub, Petra (editor); Kleinsmann, Maaike (editor)","2019","In low- and middle-income countries (LMIC), diagnostics are not always available in remote areas. Hospitals and healthcare centres are often too far from the community, and waiting times are up to a few hours even for relatively simple procedures. Moreover, travelling to the healthcare centre and taking the diagnostic test is frequently unaffordable. Point of Care Tests (POCTs) can improve the availability, accessibility and affordability of the diagnostics by providing the test at the time and place of patient care. Although many POCTs have been developed already, there remain challenges to enable the healthcare workers (HCW) and the patients to use the device in practice. In this paper, we aim to provide a systemic overview of the barriers and opportunities for the adoption of use and acceptance of the results of POCTs based on the literature. The barriers and opportunities were clustered into six themes and used to draw out recommendations for the future design.
e/k<3). It is unknown whether these reductions in the erosion process also occur at relatively high flow velocities, where dilatancy-reduced erosion dominates (ve/k>3). Experiments were executed in a tilting flume to investigate the erosion rate of the sand-bentonite mixtures. In 13 different tests, the dry volume percentage of the bentonite additive, the diameter of the sand particles and the depth-averaged flow velocity were varied. The depth-averaged flow velocities ranged from 1 to 2 m/s and all erosion tests were performed under supercritical flow conditions. The experiments show that the bentonite additive did not influence the strength characteristics of the sand however the permeability did decrease significantly. This proves that the significant decrease of the erosion rate was caused by the decrease of the permeability of the sand and that the test conditions were in the dilatancy-reduced regime.","granular materials; hydraulics & hydrodynamics; slopes - erosion control","en","journal article","","","","","","Accepted Author Manuscript","","","","","Rivers, Ports, Waterways and Dredging Engineering","","",""
"uuid:8c0aa16f-2561-441b-be7c-0a98f590f440","http://resolver.tudelft.nl/uuid:8c0aa16f-2561-441b-be7c-0a98f590f440","Simultaneous design of different aircraft departure routes taking community noise exposure events into account","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","Calvo-Manzano, Antonio (editor); Delgado, Ana (editor); Perez-Lopez, Antonio (editor); Santiago, Jose Salvador (editor)","2019","At many airports, ground track segments may be shared by different departure routes, and the population living underneath these segments is exposed to all aircraft movements which are sent to these routes. This may cause negative community reaction to authorities and policymakers, leading to objections against the expansion of airport and aircraft operations. To take into account this concern in the design of optimal departure routes, a new multi-objective optimization formulation is developed and solved in this study. Besides two conventional objectives, i.e., annoyance and fuel consumption, a new objective is considered in the problem formulation which aims to split a ground track segment shared by two different departure routes into two different parts corresponding to each route. As a consequence, the number of people exposed to all flights operating on these routes is decreased considerably. An optimization problem with three objectives is formed, and solved by a multi-objective evolutionary algorithm based on decomposition (MOEA/D). The reliability and applicability of the developed model are demonstrated through a case study at Amsterdam Airport Schiphol. The obtained simulation results reveal that the proposed approach can offer solutions which can more effectively balance between the considered objectives.","Noise; Environment; Annoyance","en","conference paper","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:df861a98-49a6-456f-83d9-21dc970aae03","http://resolver.tudelft.nl/uuid:df861a98-49a6-456f-83d9-21dc970aae03","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)","","2019","This paper presents an analysis of the ionospheric corrections required to get a significant improvement in PPP-RTK performance. The main aim was to determine the improvement in the position precision and Time-To-First-Fix in the PPP-RTK user side using ionospheric corrections computed from a network. The study consists of two main steps. The first one includes an empirical investigation of the ionosphere model precision necessary to greatly improve the PPP-RTK performance in a simulated environment in terms of precision and convergence time. In the second one, an optimal ionosphere representation was developed to provide precise ionospheric corrections by parameterizing the ionospheric slant delays after the PPP-RTK network processing in terms of ionosphere model coefficients and differential code biases using real GNSS measurements. Experimental results demonstrate that the proposed methodology can be used for reliable regional ionosphere modeling and satellite code bias estimation, due to the consistency of the satellite code bias estimates with those provided from the International GNSS Service Analysis Centres, the high stability of the estimated receiver and satellite code biases and the low least-squares residuals of the network-based ionosphere modeling solution. Finally, it has been shown that the precision of ionospheric corrections at zenith needs to be better than 5 cm to enable faster PPP-RTK solutions.","integer ambiguity resolution; ionospheric corrections; PPP-RTK; regional ionosphere modeling; success rate; time-to-frst-fx","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:65eebe87-2993-4fba-bd09-f9c91ff6b7d4","http://resolver.tudelft.nl/uuid:65eebe87-2993-4fba-bd09-f9c91ff6b7d4","Distributed approach for aerodynamic model identification of the ice aircraft using the alternating direction method of multipliers in combination with simplotope b-splines","van den Aarssen, M.S.T. (Student TU Delft); Visser, T. (TU Delft Astrodynamics & Space Missions); de Visser, C.C. (TU Delft Control & Simulation)","","2019","High performance control allocation methods for the Innovative Control Effectors (ICE) aircraft require accurate onboard aerodynamic models, with preferably first order continuity. Simplotope B-Splines, an extension on Simplex B-Splines, have a high approximation power by using local cost functions. However, enforcing global continuity produces computationally expensive optimization problems. This paper presents a distributed approach, using the Alternating DirectionMethod of Multipliers (ADMM), to reduce the complexity of the B-Coefficients’ estimation. ADMM decouples the simplotopes, and introduces coupling coefficients to enforce global continuity, resulting in a parallel estimation algorithm whose complexity is depending solely on the partition size, being independent of refinement of the model tessellation. Results show that for a 3D model, the distributed algorithm converges steadily to the global solution with a good approximation after a couple hundred iterations. Validation results of the distributed approach were similar to those of the global optimal solution for various noise intensities, and the continuity constraints were satisfied with maximum mismatches below 10-4. The distributed approach has been used to construct a first order continuous aerodynamic model for the ICE aircraft, which has been implemented in Simulink, and proven to perform well compared to the original model.","","en","conference paper","","","","","","","","","","","Control & Simulation","","",""
"uuid:d72961b8-3c5c-4e88-bd8a-3c3a110fc9a1","http://resolver.tudelft.nl/uuid:d72961b8-3c5c-4e88-bd8a-3c3a110fc9a1","Effect of graphite on hot metal desulphurisation","Schrama, F.N.H. (TU Delft (OLD) MSE-3; Tata Steel Europe Limited); Beunder, Elisabeth M. (Tata Steel Europe Limited); Visser, H. (Tata Steel Europe Limited); Boom, R. (TU Delft (OLD) MSE-1); Sietsma, J. (TU Delft Materials Science and Engineering; TU Delft (OLD) MSE-3); Yang, Y. (TU Delft (OLD) MSE-3)","","2019","During the magnesium-lime co-injection process for hot metal desulphurisation, graphite can precipitate as a result of carbon oversaturation. The formed graphite is known to form a layer between the slag and the hot metal. This potentially blocks the sulphides, that are formed during the desulphurisation process, to reach the slag phase thus hampering the desulphurisation efficiency. In this research it was aimed to obtain experimental evidence for the postulated hampering effect of graphite on the hot metal desulphurisation efficiency at an industrial process. In 2018 at Tata Steel in IJmuiden, the Netherlands, the carbon concentration in the hot metal was measured after the reagent injection, instead of being calculated assuming carbon saturation of the hot metal. This provides the opportunity to predict graphite formation during the process. Although a correlation is found between graphite formation and specific magnesium consumption, which is a measure for desulphurisation efficiency, the effect could not be directly proven, as too many other parameters could have influenced the desulphurisation process. Data analysis does show that the observed correlation could not be attributed to temperature and initial sulphur concentration of the hot metal, which are the two most important factors for the desulphurisation efficiency. The observed correlation between graphite formation and desulphurisation efficiency is significant at low initial sulphur concentrations (<225 ppm) and insignificant at high initial sulphur concentrations (>225 ppm). Key Words Hot metal desulphurisation, magnesium consumption, graphite precipitation, kish","Hot Metal Desulphurisation; magnesium consumption; graphite precipitation; kish","en","conference paper","VDeH Verlag Stahleisen","","","","","","","","","Materials Science and Engineering","(OLD) MSE-3","","",""
"uuid:b18f4405-c784-4bf0-8a25-d71e042f85b1","http://resolver.tudelft.nl/uuid:b18f4405-c784-4bf0-8a25-d71e042f85b1","Factors Affecting Cloud Infra-Service Development Lead Times: A Case Study at ING","Huijgens, H.K.M. (ING); Greuter, Eric (ING); Brons, Jerry (ING); Doorn, Evert A. van (ING); Papadopoulos, Ioannis (ING); Martinez, Francisco Morales (Student TU Delft); Aniche, Maurício (TU Delft Software Engineering); Visser, O.W. (TU Delft Computer Science & Engineering-Teaching Team); van Deursen, A. (TU Delft Software Technology)","","2019","The development of Cloud Infra-Services has shifted over the past decade in the direction of a software code development process, also known as infrastructure as code (IaC). Contemporary continuous delivery settings in industry require fast feedback. As a consequence, companies need insight in time spent, especially in the development of such services. We examine a series of 28 Cloud Infra-Services within ING, and explore which factors affect their overall time to market and development time. An initial perception among several stakeholders in the Cloud Infra-Service development process, that Cloud Infra-Services within ING take longer than those in peer companies, is not confirmed by our benchmark. Development team members identified the time to internal market of services to be affected negatively by the portal where consumers can order a service and the Orchestration Workflows and by team dynamics. This perception is supported by additional metrics. We propose that promising ways to reduce lead time include reducing the complexity of the ING environment, by treating Cloud Infra-Services like regular software deliveries and by reducing the dependencies between teams in terms of tooling and collaboration.","","en","conference paper","IEEE","","","","","","","","","Software Technology","Software Engineering","","",""
"uuid:cde4b183-9fd6-4dc1-8988-4ad9de8d95bd","http://resolver.tudelft.nl/uuid:cde4b183-9fd6-4dc1-8988-4ad9de8d95bd","Active corrosion protection of various aluminium alloys by lithium-leaching coatings","Visser, P. (TU Delft (OLD) MSE-6; Akzo Nobel); Terryn, H.A. (TU Delft (OLD) MSE-6; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2019","This study presents the active protective properties of lithium-leaching coatings for a range of aluminium alloys. Coatings with and without lithium carbonate as leachable inhibitor were applied on the aluminium alloys, artificially damaged and exposed to the neutral salt spray. A combined approach of scanning electron microscopy and electrochemical measurements revealed that the lithium carbonate leaching coating provided effective corrosion inhibition on AA2024, AA7075, AA5083, and AA6014 by the formation of a protective layer in the defect area and preventing local corrosion processes despite the different intrinsic electrochemical activity of the alloys.","active corrosion protection; alloy; aluminium; inhibitor; lithium","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:591d29b2-e0b9-4811-982a-6184a06cc22a","http://resolver.tudelft.nl/uuid:591d29b2-e0b9-4811-982a-6184a06cc22a","The hampering effect of precipitated carbon on hot metal desulfurization with magnesium","Schrama, F.N.H. (TU Delft (OLD) MSE-3; Tata Steel Europe Limited); Beunder, Elisabeth M. (Tata Steel Europe Limited); Visser, H. (TU Delft (OLD) MSE-3; Tata Steel Europe Limited); Sietsma, J. (TU Delft Materials Science and Engineering; TU Delft (OLD) MSE-3); Boom, R. (TU Delft (OLD) MSE-1); Yang, Y. (TU Delft (OLD) MSE-3)","","2019","Carbon may precipitate during the hot metal desulfurization (HMD) process as a result of carbon oversaturation because of temperature decrease. The precipitated carbon flakes form a layer between hot metal and slag. It is postulated that this carbon layer hampers desulfurization with magnesium by preventing MgS particles from reaching the slag phase. At Tata Steel in IJmuiden, the Netherlands, carbon in hot metal is measured in 657 heats after reagent injection. With this data, it can be determined whether the hampering effect of precipitated carbon on MgS flotation has a significant effect on the performance of the industrial HMD process. Plant data show a correlation between the precipitated carbon and the specific magnesium consumption for hot metal with a low initial sulfur concentration (below 225 ppm). This correlation cannot be found for hot metal with a higher initial sulfur concentration (above 275 ppm). Furthermore, a sulfur mass balance is made over the converter process, that shows no effect of carbon precipitation during HMD on resulfurization in the converter. The limited experimental accuracy of the plant data prevents a quantitative description of the hampering effect. The measurements do suggest that the effect is small.","carbon precipitation; carbon saturation; hot metal desulfurization; magnesium consumption","en","journal article","","","","","","Gepubliceerd in Special Issue: Highlights from ESTAD 2019","","","","Materials Science and Engineering","(OLD) MSE-3","","",""
"uuid:358c996f-80e4-42f5-8779-1104b0219e93","http://resolver.tudelft.nl/uuid:358c996f-80e4-42f5-8779-1104b0219e93","Increased TGF-β and BMP Levels and Improved Chondrocyte-Specific Marker Expression In Vitro under Cartilage-Specific Physiological Osmolarity","Tan Timur, Ufuk (Universiteit Maastricht; Rheinisch-Westfälische Technische Hogeschool); Caron, Marjolein (Universiteit Maastricht); van den Akker, Guus (Universiteit Maastricht); van der Windt, Anna (Erasmus MC); Visser, Jenny (Erasmus MC); van Rhijn, Lodewijk (Universiteit Maastricht); Weinans, Harrie (TU Delft Biomaterials & Tissue Biomechanics; University Medical Center Utrecht); Welting, Tim (Universiteit Maastricht); Emans, Pieter (Universiteit Maastricht); Jahr, H. (Universiteit Maastricht; Rheinisch-Westfälische Technische Hogeschool)","","2019","During standard expansion culture (i.e., plasma osmolarity, 280 mOsm) human articular chondrocytes dedifferentiate, making them inappropriate for autologous chondrocyte implantation to treat cartilage defects. Increasing the osmolarity of culture media to physiological osmolarity levels of cartilage (i.e., 380 mOsm), increases collagen type II (COL2A1) expression of human articular chondrocytes in vitro, but the underlying molecular mechanism is not fully understood. We hypothesized that TGF-β superfamily signaling may drive expression of COL2A1 under physiological osmolarity culture conditions. Human articular chondrocytes were cultured in cytokine-free medium of 280 or 380 mOsm with or without siRNA mediated TGF-β2 knockdown (RNAi). Expression of TGF-β isoforms, and collagen type II was evaluated by RT-qPCR and immunoblotting. TGF-β2 protein secretion was evaluated using ELISA and TGF-β bioactivity was determined using an established reporter assay. Involvement of BMP signaling was investigated by culturing human articular chondrocytes in the presence or absence of BMP inhibitor dorsomorphin and BMP bioactivity was determined using an established reporter assay. Physiological cartilage osmolarity (i.e., physosmolarity) most prominently increased TGF-β2 mRNA expression and protein secretion as well as TGF-β bioactivity. Upon TGF-β2 isoform-specific knockdown, gene expression of chondrocyte marker COL2A1 was induced. TGF-β2 RNAi under physosmolarity enhanced TGF-β bioactivity. BMP bioactivity increased upon physosmotic treatment, but was not related to TGF-β2 RNAi. In contrast, dorsomorphin inhibited COL2A1 mRNA expression in human articular chondrocytes independent of the osmotic condition. Our data suggest a role for TGF-β superfamily member signaling in physosmolarity-induced mRNA expression of collagen type II. As physosmotic conditions favor the expression of COL2A1 independent of our manipulations, contribution of other metabolic, post-transcriptional or epigenetic factors cannot be excluded in the underlying complex and interdependent regulation of marker gene expression. Dissecting these molecular mechanisms holds potential to further improve future cell-based chondral repair strategies.","bone morphogenetic proteins; chondrocyte; collagen type II; osmolarity; signalling; TGF-β superfamily","en","journal article","","","","","","","","","","","Biomaterials & Tissue Biomechanics","","",""
"uuid:a51521bd-16a3-4d1a-aaa6-69990a128db8","http://resolver.tudelft.nl/uuid:a51521bd-16a3-4d1a-aaa6-69990a128db8","Development of a Ti/Au TES Microcalorimeter Array as a Backup Sensor for the Athena/X-IFU Instrument","Nagayoshi, K. (SRON Netherlands Institute for Space Research); Ridder, M. L. (SRON Netherlands Institute for Space Research); Bruijn, M. P. (SRON Netherlands Institute for Space Research); Gottardi, L. (SRON Netherlands Institute for Space Research); Taralli, E. (SRON Netherlands Institute for Space Research); Khosropanah, P. (SRON Netherlands Institute for Space Research); Akamatsu, H. (SRON Netherlands Institute for Space Research); Visser, S. (SRON Netherlands Institute for Space Research); Gao, J.R. (TU Delft QN/Gao Lab; SRON Netherlands Institute for Space Research; Kavli institute of nanoscience Delft)","","2019","We are developing a transition edge sensor (TES) microcalorimeter array based on a Ti/Au superconducting bilayer, as a backup option for the X-IFU instrument on the Athena X-ray observatory. The array is read out by a frequency-division multiplexing readout system using a 1–5 MHz frequency band. Extensive research collaborations between NASA/Goddard and SRON have led to new design rules for microcalorimeters such as low resistivity of the superconductor bilayer, moderately high ohmic resistance of the TES by changing the aspect ratio and no extra metal strips. We have improved our detector fabrication process according to these design principles and produced TES arrays. Although single-pixel characterizations of these arrays are ongoing, the best energy resolution of 2.0 eV for 5.9 keV X-ray has been observed with a 120 × 20 μm2 TES with a normal resistance of 150 mΩ, biased at 2.2 MHz frequency. This shows that our Ti/Au TES array has a potential to fulfill the detector requirements of the X-IFU instrument.","Athena; Transition edge sensor; X-IFU; X-ray","en","journal article","","","","","","Accepted Author Manuscript","","2020-11-24","","","QN/Gao Lab","","",""
"uuid:9136ee53-ff62-4385-9315-8fe68a9906e3","http://resolver.tudelft.nl/uuid:9136ee53-ff62-4385-9315-8fe68a9906e3","Intrinsic methane steam reforming kinetics on nickel-ceria solid oxide fuel cell anodes","van Biert, L. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (TU Delft Energy Technology)","","2019","Direct internal reforming in solid oxide fuel cells (SOFCs) is advantageous as it enables to heat and steam from the exothermic hydrogen oxidation reaction in the endothermic steam reforming reaction. However, it may increase potentially deteriorating temperature gradients as well. The temperature and concentration profiles can be accurately simulated with adequate SOFC models and intrinsic methane steam reforming (MSR) kinetics. Therefore, this study aims to derive intrinsic MSR kinetics suitable for control-oriented dynamic SOFC models. The individual influences of the methane, steam and hydrogen partial pressures on the MSR reaction are experimentally studied on functional electrolyte supported cells with nickel-gadolinium doped cerium anodes. A non-proportional dependence of the MSR rate on the methane partial pressure and a slight negative dependence on the steam partial pressure are observed, but the effect of the hydrogen partial pressure seems insignificant. Various kinetic rate equations are parameterised with the experimental data and an ideal plug flow reactor model. An intrinsic Langmuir-Hinshelwood mechanism for a rate determining step between associatively adsorbed methane and dissociatively adsorbed steam on the catalyst surface shows good agreement with the experimental data, and is thermodynamically and physically consistent.","","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:2ecf0ea6-b1a9-4e81-9994-2acff9e9b2fa","http://resolver.tudelft.nl/uuid:2ecf0ea6-b1a9-4e81-9994-2acff9e9b2fa","Li leaching from lithium carbonate-primer: An emerging perspective of transport pathway development","Laird, J. S. (University of Melbourne); Visser, P. (TU Delft (OLD) MSE-6; AkzoNobel); Ranade, S. (Indian Institute of Technology Madras); Hughes, A.E. (CSIRO, Mineral Resources; Deakin University); Terryn, H.A. (TU Delft (OLD) MSE-6; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2019","Studies of Li depletion in sections of a Li 2 CO 3 -primer comprising a polyurethane binder, MgO, TiO 2 , BaSO 4 in addition to Li 2 CO 3, were performed using a combination of particle induced γ-ray and X-ray emission spectroscopies along with SEM/EDS analysis. A mixture of depletion behaviours was observed. At the earliest stages (to around 48 h)initial release was confined to the surface. At longer times (168 h)voids developed deeper into the primer and after 500 h Li 2 CO 3 dissolution was observed at places throughout the thickness of the primer to the metal/primer interface. Microscopic transport pathways formed which involved all large inorganic particles. SEM showed that rupture of the polyurethane matrix contributed to network formation. Finite element analysis indicated that rupture may be due to internal stresses around particles isolated in the polyurethane matrix and associated with water uptake. Thus the transport network seemed to be generated by chemical dissolution at the particle/polymer interface and may be enhanced by mechanical degradation due to internal mechanical stresses. The release kinetics of the Li 2 CO 3 inhibitor from the primer was followed as a function of time and the data analysed according to a release behaviour of t n . There was very rapid initial release of Li followed by a slower release of Mg and to a lesser extent Ba. The value of n varied significant with time, but showed a mixture of Fickian release and direct dissolution for Mg and Ba at intermediate times, but transport through a pore network at longer times. The leaching data was interpreted in terms of local transport networks that developed in the primer with time.","Coating; Corrosion; Inhibitor; Leaching; Lithium","en","journal article","","","","","","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.","","2019-11-09","","","(OLD) MSE-6","","",""
"uuid:faa51792-aca3-4c38-907e-6d5653357fe8","http://resolver.tudelft.nl/uuid:faa51792-aca3-4c38-907e-6d5653357fe8","The chemical throwing power of lithium-based inhibitors from organic coatings on AA2024-T3","Visser, P. (TU Delft (OLD) MSE-6; AkzoNobel); Marcoen, K. (Vrije Universiteit Brussel); Trindade, G. F. (University of Surrey); Abel, M. L. (University of Surrey); Watts, J. F. (University of Surrey); Hauffman, T. (Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6); Terryn, H.A. (TU Delft (OLD) MSE-6; Vrije Universiteit Brussel)","","2019","Chemical throwing power, being the distance over which an inhibitor is able to protect a defect effectively, is an important parameter for active protective coatings. This study investigates the chemical throwing power of lithium-based leachable corrosion inhibitors exhibiting different leaching kinetics, from coatings at different inhibitor loading concentrations. The results demonstrate that Li-salt loaded coatings provide corrosion protection of defect areas up to a width of 6 mm. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to detect the lateral spread of Li in the defect areas and provide the chemical speciation of corrosion protective layers in the defect areas.","Active protection; Aluminium; Inhibitor; Lithium; Throwing power; ToF-SIMS","en","journal article","","","","","","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.","","2019-08-11","","","(OLD) MSE-6","","",""
"uuid:e5557766-d027-40c1-99db-1d10ccd2b383","http://resolver.tudelft.nl/uuid:e5557766-d027-40c1-99db-1d10ccd2b383","Dynamic modelling of a direct internal reforming solid oxide fuel cell stack based on single cell experiments","van Biert, L. (TU Delft Ship Design, Production and Operations); Godjevac, M. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Aravind, P.V. (TU Delft Energy Technology)","","2019","Direct internal reforming enables optimal heat integration and reduced complexity in solid oxide fuel cell (SOFC)systems, but thermal stresses induced by the increased temperature gradients may inflict damage to the stack. Therefore, the development of adequate control strategies requires models that can accurately predict the temperature profiles in the stack. A 1D dynamic modelling platform is developed in this study, and used to simulate SOFCs in both single cell and stack configurations. The single cell model is used to validate power law and Hougen-Watson reforming kinetics derived from experiments in previous work. The stack model, based on the same type of cells, accounts for heat transfer in the inactive area and to the environment, and is validated with data reported by the manufacturer. The reforming kinetics are then implemented in the stack model to simulate operation with direct internal reforming. Although there are differences between the temperature profiles predicted by the two kinetic models, both are more realistic than assuming chemical equilibrium. The results highlight the need to identify rate limiting steps for the reforming and hydrogen oxidation reactions on anodes of functional SOFC assemblies. The modelling approach can be used to study off-design conditions, transient operation and system integration, as well as to develop adequate energy management and control strategies.","Cell experiments; Control-oriented; Dynamic modelling; Reforming kinetics; Solid oxide fuel cells; Thermal stress","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:e3f7b9e6-d429-4684-953e-8ac9de32d20c","http://resolver.tudelft.nl/uuid:e3f7b9e6-d429-4684-953e-8ac9de32d20c","High-dynamic baseline determination for the Swarm constellation","Mao, X. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions)","","2019","Baseline determination for the European Space Agency Swarm magnetic field mission is investigated. Swarm consists of three identical satellites -A, -B and -C. The Swarm-A and -C form a pendulum formation whose baseline length varies between about 30 and 180 km. Swarm-B flies in a higher orbit, causing its orbital plane to slowly rotate with respect to those of Swarm-A and -C. This special geometry results in short periods when the Swarm-B satellite is adjacent to the other Swarm satellites. Ten 24-hr periods around such close encounters have been selected, with baseline lengths varying between 50 and 3500 km. All Swarm satellites carry high-quality, dual-frequency and identical Global Positioning System receivers not only allowing precise orbit determination of the single Swarm satellites, but also allowing a rigorous assessment of the capability of precise baseline determination between the three satellites. These baselines include the high-dynamic baselines between Swarm-B and the other two Swarm satellites. For all orbit determinations, use was made of an Iterative Extended Kalman Filter approach, which could run in single-, dual-, and triple-satellite mode. Results showed that resolving the issue of half-cycle carrier phase ambiguities (present in original release of GPS RINEX data) and reducing the code observation noise by the German Space Operations Center converter improved the consistency of reduced-dynamic and kinematic baseline solutions for both the Swarm-A/C pendulum pair and other combinations of Swarm satellites. All modes led to comparable consistencies between the computed orbit solutions and satellite laser ranging observations at a level of 2 cm. In addition, the consistencies with single-satellite ambiguity fixed orbit solutions by the German Space Operations Center are at comparable levels for all the modes, with reduced-dynamic baseline consistency at a level of 1-3 mm for the pendulum Swarm-A/C formation and 3-5 mm for the high-dynamic Swarm-B/A and -B/C satellite pairs in different directions.","Ambiguity fixing; Half-cycle ambiguity; Precise baseline determination; Precise orbit determination; Swarm","en","journal article","","","","","","Accepted author manuscript","","2021-03-27","","","Astrodynamics & Space Missions","","",""
"uuid:9cc51e0f-6994-497e-9887-345c3c3d0c1d","http://resolver.tudelft.nl/uuid:9cc51e0f-6994-497e-9887-345c3c3d0c1d","Optimizing the stoichiometry of ultrathin NbTiN films for high-performance superconducting nanowire single-photon detectors","Zichi, Julien (KTH Royal Institute of Technology); Chang, J. (TU Delft ImPhys/Optics); Steinhauer, Stephan (KTH Royal Institute of Technology); Von Fieandt, Kristina (Uppsala University); Los, J.W.N. (Single Quantum); Visser, G.J. (Single Quantum); Kalhor, N. (Single Quantum); Esmaeil Zadeh, I.Z. (TU Delft ImPhys/Optics); Zwiller, Val (KTH Royal Institute of Technology; Single Quantum)","","2019","The requirements in quantum optics experiments for high single-photon detection efficiency, low timing jitter, low dark count rate and short dead time have been fulfilled with the development of superconducting nanowire single-photon detectors. Although they offer a detection efficiency above 90%, achieving a high time resolution in devices made of amorphous materials is a challenge, particularly at temperatures above 0.8 K. Devices made from niobium nitride and niobium titanium nitride allow us to reach the best timing jitter but, in turn, have stronger requirements in terms of film quality to achieve a high efficiency. Here we take advantage of the flexibility of reactive co-sputter deposition to tailor the composition of NbxTi1-xN superconducting films and show that a Nb fraction of x = 0.62 allows for the fabrication of detectors from films as thick as 9 nm and covering an active area of 20 µm, with a wide detection saturation plateau at telecom wavelengths and in particular at 1550 nm. This is a signature of an internal detection efficiency saturation, achieved while maintaining the high time resolution associated with NbTiN and operation at 2.5K. With our optimized recipe, we reliably fabricated detectors with high critical current densities reaching a saturation plateau at 1550 nm with 80% system detection efficiency and with a FWHM timing jitter as low as 19.5 ps.","","en","journal article","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:b87d2505-3c8f-4e4d-8ed6-bb36c8f29c73","http://resolver.tudelft.nl/uuid:b87d2505-3c8f-4e4d-8ed6-bb36c8f29c73","Characterization of Thermospheric Vertical Wind Activity at 225- to 295-km Altitude Using GOCE Data and Validation Against Explorer Missions","Visser, T. (TU Delft Astrodynamics & Space Missions); March, G. (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)","","2019","Recently, the horizontal and vertical cross wind at 225- to 295-km altitude were derived from linear acceleration measurements of the Gravity field and steady-state Ocean Circulation Explorer satellite. The vertical component of these wind data is compared to wind data derived from the mass spectrometers of the Atmosphere Explorer C and E and Dynamics Explorer 2 satellites. From a statistical analysis of the 120-s moving-window standard deviation of the vertical wind (σ(Vz)), no consistent discrepancy is found between the accelerometer-derived and the mass spectrometer-derived data. The validated Gravity field and steady-state Ocean Circulation Explorer data are then used to investigate the influence of several parameters and indices on the vertical wind activity. To this end, the probability distribution of σ(Vz) is plotted after distributing the data over bins of the parameter under investigation. The vertical wind is found to respond strongly to geomagnetic activity at high latitudes, although the response settles around a maximum standard deviation of 50 m/s at an Auroral Electrojet index of 800. The dependence on magnetic local time changes with magnetic latitude, peaking around 4:30 over the polar cap and around 01:30 and 13:30 in the auroral oval. Seasonal effects only become visible at low to middle latitudes, revealing a peak wind variability in both local summer and winter. The vertical wind is not affected by the solar activity level.","Atmosphere Explorers; Dynamics Explorer 2; Gravity field and steady-state Ocean Circulation Explorer (GOCE); thermospheric vertical wind","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:442fe564-6bd6-4559-9edd-48aac2c85c60","http://resolver.tudelft.nl/uuid:442fe564-6bd6-4559-9edd-48aac2c85c60","Absolute and relative orbit determination for the CHAMP/GRACE constellation","Mao, X. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions)","","2019","Precise orbit determination was investigated for a satellite constellation comprised of two different missions, the CHAllenging Minisatellite Payload (CHAMP) satellite and the Gravity Recovery And Climate Experiment (GRACE) twin satellites. The orbital planes of these two missions aligned closely during March to May 2005, allowing precise baseline determinations between the associated three satellites based on their onboard BlackJack Global Positioning System (GPS) receivers. The GRACE-A/B satellites fly in tandem formation with a baseline of around 220 km, whereas the baselines between CHAMP and the GRACE tandem vary from about 110 to 7500 km during 24-h orbital arcs centered around the points of closest approaches. A number of factors had to be dealt with for orbit determinations, including the cross-talk between the CHAMP GPS main navigation and occultation antennas, the different levels of non-gravitational accelerations, and the rapidly changing geometry that complicates the fixing of integer ambiguities for the GPS carrier-phase observations. Quality assessments of the orbit solutions were based on comparisons with Satellite Laser Ranging (SLR) observations, best orbit solutions had a precision of typically 1.7–2.3 cm. Consistency checks between reduced-dynamic and kinematic orbit solutions were done. For the GRACE baselines, the reduced-dynamic/kinematic baseline consistency was typically better than 1 cm, with an ambiguity fixing success rate of around 94%. The agreement with the K/Ka-Band Radar Ranging (KBR) measurements was about 0.6 mm. For the CHAMP/GRACE pairs, the reduced-dynamic/kinematic baseline consistency varied from 0.5 to 2.5 cm, where better consistency was obtained for shorter arcs.","Antenna pattern; High-dynamic baseline; Integer ambiguity; Precise baseline determination; Precise orbit determination; Satellite constellation","en","journal article","","","","","","Accepted author manuscript","","2021-05-17","","","Astrodynamics & Space Missions","","",""
"uuid:6173d2bb-9e9e-4461-8023-0039b0cd453f","http://resolver.tudelft.nl/uuid:6173d2bb-9e9e-4461-8023-0039b0cd453f","Integrated design and allocation of optimal aircraft departure routes","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2018","This paper presents a new multi-objective optimization formulation for the design and allocation of optimal aircraft departure routes. In the considered problem – besides two conventional objectives based on cumulative noise criteria and fuel burn – a new objective considering the flight frequency is introduced. Moreover, to take advantage of the combination of designing new routes and allocating flights to these routes, two different routes are considered simultaneously, and the distribution of flights over these two routes is addressed in parallel. Then, a new version of the so-called MOEA/D optimization algorithm is developed to solve the formulated optimization problem. Two different case studies, one at Rotterdam The Hague Airport and one at Amsterdam Airport Schiphol in The Netherlands, are carried out to evaluate the reliability and applicability of the proposed approach. The obtained results reveal that the proposed approach can provide solutions which can balance more effectively the concerned metrics such as the number of annoyed people, fuel burn, number of people exposed to certain noise levels, and number of aircraft movements which people are subjected to.","Aircraft allocation; Departure routes; Fuel consumption; Noise abatement; Noise events; Trajectory optimization","en","journal article","","","","","","","","2020-07-17","","","Air Transport & Operations","","",""
"uuid:151190a0-62d4-43b2-9473-c7846d051ac4","http://resolver.tudelft.nl/uuid:151190a0-62d4-43b2-9473-c7846d051ac4","Shaping Forces: Review of two Bridge Design Methodologies towards Architectural and Structural Symbiosis","Smits, J.E.P. (TU Delft OLD Structural Design); Eigenraam, P. (TU Delft Structural Design & Mechanics); Gkaidatzis, R. (TU Delft OLD Structural Design); Visser, Dirk Rinze (BuroHappold Engineering); Wong, Kailin (BuroHappold Engineering); Wassermann-Fry, Stephan (BuroHappold Engineering)","","2018","This paper investigates the symbiotic relationship between the architectural appearance of a bridge and the structural design. The research is done by reviewing and comparing the design methodology employed by the first author in the conceptualization of two of his bridges; an early work from 1997 and a recent work from 2017. The review of the early work describes a design methodology that could be described as intuitive design, whereas the later work is the result of computational from-finding and optimization. Parallels are drawn and the historical development of the toolbox of the architect and the engineer is described. The paper analysis the way the two designs were achieved by looking from the perspective of the architect and that of the engineer, two disciplines that nowadays closely work together on the design of a bridge. The paper concludes by identifying the key design considerations to achieve a beautiful yet structurally sound bridge. The question whether beauty can be the sole result of a rational design process towards the most efficient form according to the laws of mechanics, is addressed. This paper demonstrate the belief that when it comes to the design of a bridge, architecture and structure, form and force, are involved in an interdependable and symbiotic relationship.","Bridge design; Architecture; Structural design; Optimization; Parametric design; Form-finding; Concrete; FRP","en","journal article","","","","","","","","2019-06-01","","","OLD Structural Design","","",""
"uuid:fc400392-9662-4b0f-9675-568ae26d591b","http://resolver.tudelft.nl/uuid:fc400392-9662-4b0f-9675-568ae26d591b","The impact of GPS receiver modifications and ionospheric activity on Swarm baseline determination","Mao, X. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions)","","2018","The European Space Agency (ESA) Swarm mission is a satellite constellation launched on 22 November 2013 aiming at observing the Earth geomagnetic field and its temporal variations. The three identical satellites are equipped with high-precision dual-frequency Global Positioning System (GPS) receivers, which make the constellation an ideal test bed for baseline determination. From October 2014 to August 2016, a number of GPS receiver modifications and a new GPS Receiver Independent Exchange Format (RINEX) converter were implemented. Moreover, the on-board GPS receiver performance has been influenced by the ionospheric scintillations. The impact of these factors is assessed for baseline determination of the pendulum formation flying Swarm-A and -C satellites. In total 30 months of data - from 15 July 2014 to the end of 2016 - is analyzed. The assessment includes analysis of observation residuals, success rate of GPS carrier phase ambiguity fixing, a consistency check between the so-called kinematic and reduced-dynamic baseline solution, and validations of orbits by comparing with Satellite Laser Ranging (SLR) observations. External baseline solutions from The German Space Operations Center (GSOC) and Astronomisches Institut - Universität Bern (AIUB) are also included in the comparison. Results indicate that the GPS receiver modifications and RINEX converter changes are effective to improve the baseline determination. This research eventually shows a consistency level of 9.3/4.9/3.0 mm between kinematic and reduced-dynamic baselines in the radial/along-track/cross-track directions. On average 98.3% of the epochs have kinematic solutions. Consistency between TU Delft and external reduced-dynamic baseline solutions is at a level of 1 mm level in all directions.","Antenna patterns; GPS receiver modifications; Ionospheric scintillation; Precise baseline determination; Swarm satellite","en","journal article","","","","","","","","2020-03-20","","","Astrodynamics & Space Missions","","",""
"uuid:24476b44-b06f-400b-ad30-d10cb0598d16","http://resolver.tudelft.nl/uuid:24476b44-b06f-400b-ad30-d10cb0598d16","Assessment of ionospheric corrections for PPP-RTK using regional ionosphere modeling (PPT)","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","other","","","","","","Power Point Presentatie","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:9ec80485-90af-4dc5-a173-ea1586917a8f","http://resolver.tudelft.nl/uuid:9ec80485-90af-4dc5-a173-ea1586917a8f","A mirroring architecture for sophisticated mobile games using computation‐offloading","Jiang, M. (Universiteit Utrecht); Visser, O.W. (TU Delft Dataintensive Systems); Prasetya, I.S.W.B. (Universiteit Utrecht); Iosup, A. (TU Delft Dataintensive Systems)","","2018","Mobile gaming is already a popular and lucrative market. However, the low performance and reduced power capacity of mobile devices severely limit the complexity of mobile games and the duration of their game sessions. To mitigate these issues, in this article, we explore using computation‐offloading, that is, allowing the compute‐intensive parts of mobile games to execute on remote infrastructure. Computation‐offloading raises the combined challenge of addressing the trade‐offs between performance and power‐consumption while also keeping the game playable. We propose Mirror, a system for computation‐offloading that supports the demanding performance requirements of sophisticated mobile games. Mirror proposes several conceptual contributions: support for fine‐grained partitioning, both offline (set by developers) and dynamic (policy‐based), and real‐time asynchronous offloading and user‐input synchronization protocols that enable Mirror‐based systems to bound the delays introduced by offloading and thus to achieve adequate performance. Mirror is compatible with all games that are tick‐based and user‐input deterministic. We implement a real‐world prototype of Mirror and apply it to the real‐world, complex, popular game OpenTTD. The experimental results show that, in comparison with the non‐offloaded OpenTTD, Mirror‐ed OpenTTD can significantly improve performance and power consumption while also delivering smooth gameplay. As a trade‐off, Mirror introduces acceptable delay on user inputs.","cloud offloading; computation-offloading; fine-grained offloading; mirrored computation; offloadingmobilegames; ,offloadingpolicies; systemarchitecture","en","journal article","","","","","","Special Issue: Combined Special issues on Recent advancements in parallel and distributed algorithms (ICA3PP 2017) and Heterogeneous and unconventional cluster architectures and applications (HUCAA)","","","","","Dataintensive Systems","","",""
"uuid:e7524d66-4003-444b-8654-60068ba7a09b","http://resolver.tudelft.nl/uuid:e7524d66-4003-444b-8654-60068ba7a09b","PIE: A Domain-Specific Language for Interactive Software Development Pipelines","Konat, G.D.P. (TU Delft Programming Languages); Steindorfer, M.J. (TU Delft Programming Languages); Erdweg, S.T. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2018","Context.
Software development pipelines are used for automating essential parts of software engineering processes, such as build automation and continuous integration testing. In particular, interactive pipelines, which process events in a live environment such as an IDE, require timely results for low-latency feedback, and persistence to retain low-latency feedback between restarts.
Inquiry.
Developing an incrementalized and persistent version of a pipeline is one way to reduce feedback latency, but requires implementation of dependency tracking, cache invalidation, and other complicated and error-prone techniques. Therefore, interactivity complicates pipeline development if timeliness and persistence become responsibilities of the pipeline programmer, rather than being supported by the underlying system. Systems for programming incremental and persistent pipelines exist, but do not focus on ease of development, requiring a high degree of boilerplate, increasing development and maintenance effort.
Approach.
We develop Pipelines for Interactive Environments (PIE), a Domain-Specific Language (DSL), API, and runtime for developing interactive software development pipelines, where ease of development is a focus. The PIE DSL is a statically typed and lexically scoped language. PIE programs are compiled to programs implementing the API, which the PIE runtime executes in an incremental and persistent way.
Knowledge.
PIE provides a straightforward programming model that enables direct and concise expression of pipelines without boilerplate, reducing the development and maintenance effort of pipelines. Compiled pipeline programs can be embedded into interactive environments such as code editors and IDEs, enabling timely feedback at a low cost.
Grounding.
Compared to the state of the art, PIE reduces the code required to express an interactive pipeline by a factor of 6 in a case study on syntax-aware editors. Furthermore, we evaluate PIE in two case studies of complex interactive software development scenarios, demonstrating that PIE can handle complex interactive pipelines in a straightforward and concise way.
Importance.
Interactive pipelines are complicated software artifacts that power many important systems such as continuous feedback cycles in IDEs and code editors, and live language development in language workbenches. New pipelines, and evolution of existing pipelines, is frequently necessary. Therefore, a system for easily developing and maintaining interactive pipelines, such as PIE, is important.","domain-specific language; pipeline, interactive software development; incremental","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:1bc61188-f80b-48a9-8984-34cd947131e4","http://resolver.tudelft.nl/uuid:1bc61188-f80b-48a9-8984-34cd947131e4","Towards Zero-Overhead Disambiguation of Deep Priority Conflicts","de Souza Amorim, L.E. (TU Delft Programming Languages); Steindorfer, M.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2018","Context Context-free grammars are widely used for language prototyping and implementation. They allow formalizing the syntax of domain-specific or general-purpose programming languages concisely and declaratively. However, the natural and concise way of writing a context-free grammar is often ambiguous. Therefore, grammar formalisms support extensions in the form of declarative disambiguation rules to specify operator precedence and associativity, solving ambiguities that are caused by the subset of the grammar that corresponds to expressions.
Inquiry Implementing support for declarative disambiguation within a parser typically comes with one or more of the following limitations in practice: a lack of parsing performance, or a lack of modularity (i.e., disallowing the composition of grammar fragments of potentially different languages). The latter subject is generally addressed by scannerless generalized parsers. We aim to equip scannerless generalized parsers with novel disambiguation methods that are inherently performant, without compromising the concerns of modularity and language composition.
Approach In this paper, we present a novel low-overhead implementation technique for disambiguating deep associativity and priority conflicts in scannerless generalized parsers with lightweight data-dependency.
Knowledge Ambiguities with respect to operator precedence and associativity arise from combining the various operators of a language. While shallow conflicts can be resolved efficiently by one-level tree patterns, deep conflicts require more elaborate techniques, because they can occur arbitrarily nested in a tree. Current state-of-the-art approaches to solving deep priority conflicts come with a severe performance overhead.
Grounding We evaluated our new approach against state-of-the-art declarative disambiguation mechanisms. By parsing a corpus of popular open-source repositories written in Java and OCaml, we found that our approach yields speedups of up to 1.73x over a grammar rewriting technique when parsing programs with deep priority conflicts—with a modest overhead of 1–2 % when parsing programs without deep conflicts.
Importance A recent empirical study shows that deep priority conflicts are indeed wide-spread in real-world programs. The study shows that in a corpus of popular OCaml projects on Github, up to 17 % of the source files contain deep priority conflicts. However, there is no solution in the literature that addresses efficient disambiguation of deep priority conflicts, with support for modular and composable syntax definitions.","declarative disambiguation; data-dependent grammars; operator precedence; performance; parsing","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:0f664a13-a4af-4ea4-b230-e69d7bf8f93d","http://resolver.tudelft.nl/uuid:0f664a13-a4af-4ea4-b230-e69d7bf8f93d","How Good Is Your Puppet?: An Empirically Defined and Validated Quality Model for Puppet","Van der Bent, Eduard (Universiteit Utrecht); Hage, Jurriaan (Universiteit Utrecht); Visser, Joost (Software Improvement Group); Gousios, G. (TU Delft Software Engineering)","","2018","Puppet is a declarative language for configuration management that has rapidly gained popularity in recent years. Numerous organizations now rely on Puppet code for deploying their software systems onto cloud infrastructures. In this paper we provide a definition of code quality for Puppet code and an automated technique for measuring and rating Puppet code quality. To this end, we first explore the notion of code quality as it applies to Puppet code by performing a survey among Puppet developers. Second, we develop a measurement model for the maintainability aspect of Puppet code quality. To arrive at this measurement model, we derive appropriate quality metrics from our survey results and from existing software quality models. We implemented the Puppet code quality model in a software analysis tool. We validate our definition of Puppet code quality and the measurement model by a structured interview with Puppet experts and by comparing the tool results with quality judgments of those experts. The validation shows that the measurement model and tool provide quality judgments of Puppet code that closely match the judgments of experts. Also, the experts deem the model appropriate and usable in practice. The Software Improvement Group (SIG) has started using the model in its consultancy practice.","Measurement; Computer languages; Tools; Computational modeling; Sociology; Statistics; Software","en","conference paper","IEEE","","","","","","","","","","Software Engineering","","",""
"uuid:0ad89c60-937c-4351-8461-1d75f1fc7eb8","http://resolver.tudelft.nl/uuid:0ad89c60-937c-4351-8461-1d75f1fc7eb8","An improved MOEA/D algorithm for bi-objective optimization problems with complex Pareto fronts and its application to structural optimization","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2018","The multi-objective evolutionary algorithm based on decomposition (MOEA/D) has been recognized as a promising method for solving multi-objective optimization problems (MOPs), receiving a lot of attention from researchers in recent years. However, its performance in handling MOPs with complicated Pareto fronts (PFs) is still limited, especially for real-world applications whose PFs are often complex featuring, e.g., a long tail or a sharp peak. To deal with this problem, an improved MOEA/D (named iMOEA/D) that mainly focuses on bi-objective optimization problems (BOPs) is therefore proposed in this paper. To demonstrate the capabilities of iMOEA/D, it is applied to design optimization problems of truss structures. In iMOEA/D, the set of the weight vectors defined in MOEA/D is numbered and divided into two subsets: one set with odd-weight vectors and the other with even-weight vectors. Then, a two-phase search strategy based on the MOEA/D framework is proposed to optimize their corresponding populations. Furthermore, in order to enhance the total performance of iMOEA/D, some recent developments for MOEA/D, including an adaptive replacement strategy and a stopping criterion, are also incorporated. The reliability, efficiency and applicability of iMOEA/D are investigated through seven existing benchmark test functions with complex PFs and three optimal design problems of truss structures. The obtained results reveal that iMOEA/D generally outperforms MOEA/D and NSGA-II in both benchmark test functions and real-world applications.","Complicated Pareto fronts (PFs); Multi-objective evolutionary algorithm (MOEA); Multi-objective evolutionary algorithm based on decomposition (MOEA/D); Structural optimization; Truss structures","en","journal article","","","","","","","","2019-10-06","","","Air Transport & Operations","","",""
"uuid:9e98b8e1-f2dd-47b9-9b67-96e3ea34f033","http://resolver.tudelft.nl/uuid:9e98b8e1-f2dd-47b9-9b67-96e3ea34f033","The deep-subsurface sulfate reducer Desulfotomaculum kuznetsovii employs two methanol-degrading pathways","Sousa, Diana Z. (Wageningen University & Research); Visser, M. (Wageningen University & Research); Van Gelder, Antonie H. (Wageningen University & Research); Boeren, Sjef (Wageningen University & Research); Pieterse, M.M. (TU Delft OLD BT/Analytical Biotechnology; Netherlands Proteomics Centre); Pinkse, M.W.H. (TU Delft OLD BT/Analytical Biotechnology; Netherlands Proteomics Centre); Verhaert, P.D.E.M. (TU Delft BT/Afdelingsbureau; Netherlands Proteomics Centre; Universiteit Maastricht; Janssen Pharmaceutica Campus); Vogt, Carsten (Helmholtz Centre for Environmental Research - UFZ); Franke, Steffi (Helmholtz Centre for Environmental Research - UFZ); Kümmel, Steffen (Helmholtz Centre for Environmental Research - UFZ); Stams, Alfons J.M. (Wageningen University & Research; University of Minho)","","2018","Methanol is generally metabolized through a pathway initiated by a cobalamine-containing methanol methyltransferase by anaerobic methylotrophs (such as methanogens and acetogens), or through oxidation to formaldehyde using a methanol dehydrogenase by aerobes. Methanol is an important substrate in deep-subsurface environments, where thermophilic sulfate-reducing bacteria of the genus Desulfotomaculum have key roles. Here, we study the methanol metabolism of Desulfotomaculum kuznetsovii strain 17T, isolated from a 3000-m deep geothermal water reservoir. We use proteomics to analyze cells grown with methanol and sulfate in the presence and absence of cobalt and vitamin B12. The results indicate the presence of two methanol-degrading pathways in D. kuznetsovii, a cobalt-dependent methanol methyltransferase and a cobalt-independent methanol dehydrogenase, which is further confirmed by stable isotope fractionation. This is the first report of a microorganism utilizing two distinct methanol conversion pathways. We hypothesize that this gives D. kuznetsovii a competitive advantage in its natural environment.","","en","journal article","","","","","","","","","","","OLD BT/Analytical Biotechnology","","",""
"uuid:4dc286fd-af6c-4d6b-a59b-bdf446550aa3","http://resolver.tudelft.nl/uuid:4dc286fd-af6c-4d6b-a59b-bdf446550aa3","Intrinsically-Typed Definitional Interpreters for Imperative Languages","Poulsen, C.B. (TU Delft Programming Languages); Rouvoet, A.J. (TU Delft Programming Languages); Tolmach, Andrew (Portland State University); Krebbers, R.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2018","A definitional interpreter defines the semantics of an object language in terms of the (well-known) semantics of a host language, enabling understanding and validation of the semantics through execution. Combining a definitional interpreter with a separate type system requires a separate type safety proof. An alternative approach, at least for pure object languages, is to use a dependently-typed language to encode the object language type system in the definition of the abstract syntax. Using such intrinsically-typed abstract syntax definitions allows the host language type checker to verify automatically that the interpreter satisfies type safety. Does this approach scale to larger and more realistic object languages, and in particular to languages with mutable state and objects?
In this paper, we describe and demonstrate techniques and libraries in Agda that successfully scale up intrinsically-typed definitional interpreters to handle rich object languages with non-trivial binding structures and mutable state. While the resulting interpreters are certainly more complex than the simply-typed lambda-calculus interpreter we start with, we claim that they still meet the goals of being concise, comprehensible, and executable, while guaranteeing type safety for more elaborate object languages. We make the following contributions: (1) A _dependent-passing style_ technique for hiding the weakening of indexed values as they propagate through monadic code. (2) An Agda library for programming with scope graphs and frames, which provides a uniform approach to dealing with name binding in intrinsically-typed interpreters. (3) Case studies of intrinsically-typed definitional interpreters for the simply-typed lambda-calculus with references (STLC+Ref) and for a large subset of Middleweight Java (MJ).
We find that the migrated code has better validatability; it is straightforward to establish that a program ‘does the right thing’. Moreover, the performance is better than the previous hand-written incremental computing solution. The effort spent on modeling business logic is reduced, but integrating that logic in the application and tuning performance takes considerable effort. Thus, the ICL separates the concerns of business logic and performance, but does not reduce effort.","Domain-Specific Languages; Incremental Computing; Information Systems","en","conference paper","Association for Computing Machinery (ACM)","","","","","Accepted Author Manuscript","","","","","Programming Languages","","",""
"uuid:c67aa82a-ce0d-42fc-ba28-fb9e0f1e02b6","http://resolver.tudelft.nl/uuid:c67aa82a-ce0d-42fc-ba28-fb9e0f1e02b6","Declarative specification of indentation rules: A tooling perspective on parsing and pretty-printing layout-sensitive languages","de Souza Amorim, L.E. (TU Delft Programming Languages); Erdweg, S.T. (TU Delft Programming Languages); Steindorfer, M.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Pearce, D. (editor); Friedrich, S. (editor); Mayerhofer, T. (editor)","2018","In layout-sensitive languages, the indentation of an expression or statement can influence how a program is parsed. While some of these languages (e.g., Haskell and Python) have been widely adopted, there is little support for software language engineers in building tools for layout-sensitive languages. As a result, parsers, pretty-printers, program anal-yses, and refactoring tools often need to be handwritten, which decreases the maintainability and extensibility of these tools. Even state-of-the-art language workbenches have little support for layout-sensitive languages, restricting the development and prototyping of such languages. In this paper, we introduce a novel approach to declarative specification of layout-sensitive languages using layout declarations. Layout declarations are high-level specifications of indentation rules that abstract from low-level technicalities. We show how to derive an efficient layout-sensitive generalized parser and a corresponding pretty-printer automatically from a language specification with layout declarations. We validate our approach in a case-study using a syntax definition for the Haskell programming language, investigating the performance of the generated parser and the correctness of the generated pretty-printer against 22191 Haskell files.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:3e2024aa-3ed5-4e8f-baa8-b74a86d2a94c","http://resolver.tudelft.nl/uuid:3e2024aa-3ed5-4e8f-baa8-b74a86d2a94c","Torque model verication for the GOCE satellite","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); Fritsche, Bent (Hyperschall Technologie Göttingen)","","2018","","","en","journal article","","","","","","","","2020-11-01","","","Astrodynamics & Space Missions","","",""
"uuid:9aad733b-23d4-45d7-b52f-331b80c5d029","http://resolver.tudelft.nl/uuid:9aad733b-23d4-45d7-b52f-331b80c5d029","Scopes as Types","van Antwerpen, H. (TU Delft Programming Languages); Poulsen, C.B. (TU Delft Programming Languages); Rouvoet, A.J. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2018","Scope graphs are a promising generic framework to model the binding structures of programming languages, bridging formalization and implementation, supporting the definition of type checkers and the automation of type safety proofs. However, previous work on scope graphs has been limited to simple, nominal type systems. In this paper, we show that viewing scopes as types enables us to model the internal structure of types in a range of non-simple type systems (including structural records and generic classes) using the generic representation of scopes. Further, we show that relations between such types can be expressed in terms of generalized scope graph queries. We extend scope graphs with scoped relations and queries. We introduce Statix, a new domain-specific meta-language for the specification of static semantics, based on scope graphs and constraints. We evaluate the scopes as types approach and the Statix design in case studies of the simply-typed lambda calculus with records, System F, and Featherweight Generic Java.Scope graphs are a promising generic framework to model the binding structures of programming languages, bridging formalization and implementation, supporting the definition of type checkers and the automation of type safety proofs. However, previous work on scope graphs has been limited to simple, nominal type systems. In this paper, we show that viewing scopes as types enables us to model the internal structure of types in a range of non-simple type systems (including structural records and generic classes) using the generic representation of scopes. Further, we show that relations between such types can be expressed in terms of generalized scope graph queries. We extend scope graphs with scoped relations and queries. We introduce Statix, a new domain-specific meta-language for the specification of static semantics, based on scope graphs and constraints. We evaluate the scopes as types approach and the Statix design in case studies of the simply-typed lambda calculus with records, System F, and Featherweight Generic Java.","","en","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:e167152d-540a-4afc-a6b4-636478c2eebe","http://resolver.tudelft.nl/uuid:e167152d-540a-4afc-a6b4-636478c2eebe","Scalable Incremental Building with Dynamic Task Dependencies","Konat, G.D.P. (TU Delft Programming Languages); Erdweg, S.T. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2018","Incremental build systems are essential for fast, reproducible software builds. Incremental build systems enable short feedback cycles when they capture dependencies precisely and selectively execute build tasks efficiently. A much overlooked feature of build systems is the expressiveness of the scripting language, which directly influences the maintainability of build scripts. In this paper, we present a new incremental build algorithm that allows build engineers to use a full-fledged programming language with explicit task invocation, value and file inspection facilities, and conditional and iterative language constructs. In contrast to prior work on incrementality for such programmable builds, our algorithm scales with the number of tasks affected by a change and is independent of the size of the software project being built. Specifically, our algorithm accepts a set of changed files, transitively detects and re-executes affected build tasks, but also accounts for new task dependencies discovered during building. We have evaluated the performance of our algorithm in a real-world case study and confirm its scalability.","scalable; incremental; build; dynamic task dependency","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:5d79b7d0-4b84-47bc-a724-6d0b1e1ae228","http://resolver.tudelft.nl/uuid:5d79b7d0-4b84-47bc-a724-6d0b1e1ae228","Update on thermospheric density products from satellite observations","March, G. (TU Delft Astrodynamics & Space Missions); Visser, T. (TU Delft Astrodynamics & Space Missions); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions); Iorfida, E. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2018","","","en","poster","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:16ee745a-cea9-4f38-ad7e-0dd635c9c0de","http://resolver.tudelft.nl/uuid:16ee745a-cea9-4f38-ad7e-0dd635c9c0de","Improving the consistency of aerodynamic models and thermospheric density and wind data (PP)","Visser, T. (TU Delft Astrodynamics & Space Missions); March, G. (TU Delft Astrodynamics & Space Missions)","","2018","","","en","other","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:95ba9183-d0c5-41c9-ad22-6ed7d87018f2","http://resolver.tudelft.nl/uuid:95ba9183-d0c5-41c9-ad22-6ed7d87018f2","Compositional study of a corrosion protective layer formed by leachable lithium salts in a coating defect on AA2024-T3 aluminium alloys","Marcoen, Kristof (Vrije Universiteit Brussel); Visser, P (TU Delft OLD Virtual Materials and Mechanics; AkzoNobel); Trindade, G. F. (University of Surrey); Abel, M. L. (University of Surrey); Watts, J. F. (University of Surrey); Mol, J.M.C. (TU Delft (OLD) MSE-6); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Hauffman, T. (Vrije Universiteit Brussel)","","2018","Organic primer coatings loaded with environmentally harmful Cr(VI) corrosion inhibitive pigments still play an important role in corrosion protection of aluminium alloys for the aerospace industry. A potential “green” alternative coating system has recently been developed, loaded with lithium salt corrosion inhibitors. Under exposure to neutral salt spray, lithium salts leach from the organic coating into coating defects to induce the formation of a corrosion protective layer. In this work the composition and growth of this protective layer is investigated by time-of-flight secondary ion mass spectrometry (ToF-SIMS). ToF-SIMS imaging is successfully applied to monitor the lateral spread of leaching lithium salts in artificial 1-mm-wide scribes. The chemical composition of the protective layer is revealed by comparing the mass spectra of salt spray exposed scribe areas to the mass spectra of pseudoboehmite and aluminium-lithium layered double hydroxide reference samples. The insights obtained in this work have led to a thorough understanding of the formation mechanism of the protective layer and provide local chemical and structural information which can be linked to corrosion protection behavior.","Aluminium; Coating; Corrosion; Inhibition; Leaching; Lithium; Multivariate analysis; NMF; ToF-SIMS","en","journal article","","","","","","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.","","2018-08-28","","","OLD Virtual Materials and Mechanics","","",""
"uuid:9895af12-53da-41c7-83b2-cf93adcd6bff","http://resolver.tudelft.nl/uuid:9895af12-53da-41c7-83b2-cf93adcd6bff","Roadway to self-healing highways with integrated wireless electric vehicle charging and sustainable energy harvesting technologies","Prasanth, V. (TU Delft DC systems, Energy conversion & Storage); Shekhar, A. (TU Delft DC systems, Energy conversion & Storage); Visser, E.R.A. (Student TU Delft); Scheele, Natalia (Student TU Delft); Chandra Mouli, G.R. (TU Delft DC systems, Energy conversion & Storage); Bauer, P. (TU Delft DC systems, Energy conversion & Storage); Silvester, S. (TU Delft Applied Ergonomics and Design)","","2018","Development of electric mobility and sustainable energy result in new technologies such as contactless electric vehicle charging and roadway energy harvesting methods, but also self-healing asphalt roads. By combining these technologies a new concept of Future Sustainable Roads for Electric Mobility is created and presented in the paper. This paper bridges the gap created by these unilateral technology developments using a multi-disciplinary approach including placing cautions when necessary and suggesting viable alternatives for optimal utilization of these energy transfer and conversion techniques. Through theoretical analysis, simulations, and tests on lab-scale experimental prototypes, the impact of our proposal is showcased. Thermal and loss models are developed for self-healing asphalt. Also, integration study of solar roads and contactless charging is performed. Applying the insight gained from the results, it is discussed how some challenges also pave a way towards interesting opportunities, for instance, infrastructure sharing for material use optimization and efficient mosaic integration. Finally, an economic viability case study is presented for a future Dutch highway with such newly emerging components.","Contactless power transfer; Electric vehicles; Green energy; Inductive healing; IPT; Renewable energy; Self-healing roads","en","journal article","","","","","","","","","","","DC systems, Energy conversion & Storage","","",""
"uuid:e1c4c54d-a3bd-4f1d-a085-01a7160870b3","http://resolver.tudelft.nl/uuid:e1c4c54d-a3bd-4f1d-a085-01a7160870b3","The use of odd random phase electrochemical impedance spectroscopy to study lithium-based corrosion inhibition by active protective coatings","Meeusen, M. (TU Delft (OLD) MSE-6); Visser, P. (TU Delft (OLD) MSE-6; AkzoNobel); Fernández Macía, L. (Vrije Universiteit Brussel); Hubin, A. (Vrije Universiteit Brussel); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2018","In this work, the study of the time-dependent behaviour of lithium carbonate based inhibitor technology for the active corrosion protection of aluminium alloy 2024-T3 is presented. Odd random phase electrochemical impedance spectroscopy (ORP-EIS) is selected as the electrochemical tool to study the corrosion protective properties of a model organic coating with and without lithium carbonate as a function of immersion time, by examination of the non-linearities and non-stationarities in the system. A dedicated qualitative and quantitative analysis allows linking the presence of non-stationarities in a certain frequency range with the (un)stable behaviour of different electrochemical processes. Monitoring of the system with and without lithium corrosion inhibitors during the first 12 h after immersion in a 0.05 M NaCl aqueous solution and modelling the ORP-EIS data with equivalent electrical circuit (EEC) models revealed a relation between the trends in the parameter evolution and the (un)stable behaviour of the morphological changes taking place. This paper shows that the ORP-EIS based methodology allows us to study the behaviour of corrosion inhibitors in an alternative way; the time-dependent behaviour of corrosion inhibitor containing electrochemical systems is highlighted, proving that this a useful approach for further corrosion inhibitor and active protective coating research.","Corrosion; EIS modelling; Inhibitor; Odd random phase EIS; Reliability","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:b9742513-a6f6-4403-b554-3619d17d4b12","http://resolver.tudelft.nl/uuid:b9742513-a6f6-4403-b554-3619d17d4b12","Adaptive pitch control for ships with diesel mechanical and hybrid propulsion","Geertsma, R.D. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Visser, K. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Negenborn, R.R. (TU Delft Transport Engineering and Logistics)","","2018","Shipping urgently needs to reduce its impact on the environment, both due to CO2, NOx and particulate matter (PM) emissions and due to underwater noise. On the other hand, multifunction ships such as offshore support vessels, anchor handling and towing vessels, naval vessels and wind farm construction and support vessels require fast and accurate manoeuvring and need highly reliable systems to support reduced or no crew. Diesel mechanical propulsion with controllable pitch propellers provides high efficiency and low CO2 emissions, but has traditionally been poor in manoeuvrability, can suffer from thermal overloading due to manoeuvring and requires significant measures to meet NOx and PM emission regulations. The control strategy of diesel mechanical propulsion with fixed combinator curves is one of the causes of the poor manoeuvrability, thermal overloading and cavitation noise during manoeuvring, such as slam start and intermediate acceleration manoeuvres. This paper proposes an adaptive pitch control strategy with slow integrating speed control that reduces fuel consumption, CO2, NOx and PM emissions and underwater noise, improves acceleration performance, limits engine loading and prevents engine under- and overspeed. A simulation study with a validated model of a case study Holland class Patrol Vessel demonstrates 5–15% reduction in fuel consumption and CO2 emissions, compared to the baseline transit control mode in the ship speed range from 6 to 15 kts, during constant speed sailing. Moreover, the adaptive pitch control strategy reduces acceleration time from 0 to 15 kts with the slam start procedure by 32% compared to the baseline manoeuvre control mode and by 84% for an intermediate acceleration from 10 to 15 kts, while preventing thermal overloading of the engine, during straight line manoeuvres. Combining this control strategy with hybrid propulsion, running an electric drive in parallel with the propulsion diesel engine, can potentially further reduce fuel consumption at low speeds while also improving acceleration performance even more. Therefore, hybrid propulsion plants with controllable pitch propellers and adaptive pitch control can provide a significant contribution to the urgent reduction of environmental impact of shipping and to the need for more autonomous and reliable ship systems.","Autonomous systems; Emission reduction; Marine systems; Mechanical propulsion; Modelling and simulation; Non-linear control systems","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:6e96b106-6790-4b37-a988-7bbeaae2f04c","http://resolver.tudelft.nl/uuid:6e96b106-6790-4b37-a988-7bbeaae2f04c","On the importance of irreversibility of corrosion inhibitors for active coating protection of AA2024-T3","Visser, P. (TU Delft (OLD) MSE-6; Akzo Nobel); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2018","Inhibitor leaching, fast, effective and irreversible passivation are essential for active protective coatings to protect aluminium alloys. This study presents the comparison of the active protective properties of lithium carbonate and two organic corrosion inhibitors, benzotriazole and 2-mercaptobenzothiazole, on aluminium alloy 2024-T3 with a special focus on the irreversibility of the inhibition. A combined approach of electrochemical measurements, optical observations, surface roughness and weight-loss measurements revealed the reversible inhibition behaviour of benzotriazole and 2-mercaptobenzothiazole on AA2024-T3. On the contrary, lithium carbonate demonstrated fast, effective and irreversible corrosion inhibition, providing the essential characteristics needed for effective active corrosion protection from coatings.","Active protection; Aluminium; Inhibitor; Lithium; Organic; Reversibility","en","journal article","","","","","","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.","","2018-11-30","","","(OLD) MSE-6","","",""
"uuid:a14a5572-b75a-45f1-804c-0221115d8765","http://resolver.tudelft.nl/uuid:a14a5572-b75a-45f1-804c-0221115d8765","Optimization of noise abatement aircraft terminal routes using a multi-objective evolutionary algorithm based on decomposition","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Geijselaers, L.H.; Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","Gherman, B. (editor); Porumbel, I. (editor)","2018","Recently, a multi-objective evolutionary algorithm based on decomposition (MOEA/D) has emerged as a potential method for solving multi-objective optimization problems (MOPs) and attracted much attention from researchers. In MOEA/D, the MOPs are decomposed into a number of scalar optimization sub-problems, and these sub-problems are optimized concurrently by only utilizing the information from their neighboring sub-problems. Thanks to these advantages, MOEA/D has demonstrated to be more efficient than the non-dominated sorting genetic algorithm II (NSGA-II) and other methods. However, its applications to practical problems are still limited, especially in the domain of aerospace engineering. Therefore, this paper aims to present a new application of MOEA/D for the optimal design of noise abatement aircraft terminal routes. First, in order to optimize aircraft noise for aircraft terminal routes while taking into account the interests of various stakeholders, bi-objective optimization problems including noise and fuel consumption are formulated, in which both the ground track and vertical profile of a terminal route are optimized simultaneously. Then, MOEA/D is applied to solve these problems. Furthermore, to ensure the design space of vertical profiles is always feasible during the optimization process, a trajectory parameterization technique recently proposed is also used. This technique aims at reducing the number of model evaluations of MOEA/D and hence the computational cost will decrease significantly. The efficiency and reliability of the developed method are evaluated through case studies for departure and arrival routes at Rotterdam The Hague Airport in the Netherlands.","military aircraft; aircraft rotations; military retirements; SmartBasing","en","conference paper","Elsevier","","","","","","","","","","Air Transport & Operations","","",""
"uuid:a5ef3998-65f4-40b8-a6d0-31d9dd954729","http://resolver.tudelft.nl/uuid:a5ef3998-65f4-40b8-a6d0-31d9dd954729","Using the GOCE star trackers for validating the calibration of its accelerometers","Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2017","A method for validating the calibration parameters of the six accelerometers on board the Gravity field and steady-state Ocean Circulation Explorer (GOCE) from star tracker observations that was originally tested by an end-to-end simulation, has been updated and applied to real data from GOCE. It is shown that the method provides estimates of scale factors for all three axes of the six GOCE accelerometers that are consistent at a level significantly better than 0.01 compared to the a priori calibrated value of 1. In addition, relative accelerometer biases and drift terms were estimated consistent with values obtained by precise orbit determination, where the first GOCE accelerometer served as reference. The calibration results clearly reveal the different behavior of the sensitive and less-sensitive accelerometer axes.","Accelerometer; Bias; Bias drift; Calibration; GOCE; Gradiometer; Scale factor; Star tracker","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:05b0f759-463a-4207-912f-fee5d68bce5b","http://resolver.tudelft.nl/uuid:05b0f759-463a-4207-912f-fee5d68bce5b","Robust flight-to-gate assignment using flight presence probabilities","van Schaijk, Oscar R.P.; Visser, H.G. (TU Delft Air Transport & Operations)","","2017","In this paper we present a novel method to improve the robustness of solutions to the Flight-to-Gate Assignment Problem (FGAP), with the aim to reduce the need for gate re-planning due to unpredicted flight schedule disturbances in the daily operations at an airport. We propose an approach in which the deterministic gate constraints are replaced by stochastic gate constraints that incorporate the inherent stochastic flight delays in such a way so as to ensure that the expected gate conflict probability of two flights assigned to the same gate at the same time does not exceed a user-specified value. The novel approach is integrated into an existing multiple time slot FGAP model that relies on a binary integer programming formulation and is tested using real-life data pertaining to Amsterdam Airport Schiphol. The results confirm that the proposed approach holds out great promise to improve the robustness of the FGAP solutions.","Amsterdam Airport Schiphol; Gate assignment; gate conflict; mathematical programming; robustness; stochastic gate constraints","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:e6481676-502b-4525-8eb0-7621b4cfbe2e","http://resolver.tudelft.nl/uuid:e6481676-502b-4525-8eb0-7621b4cfbe2e","Quantifying deformation in North Borneo with GPS","Bin Mustafar, M.A. (TU Delft Astrodynamics & Space Missions; Universiti Teknologi MARA); Simons, W.J.F. (TU Delft Astrodynamics & Space Missions); Tongkul, Felix (Universiti Malaysia Sabah); Satirapod, Chalermchon (Chulalongkorn University); Omar, Kamaludin Mohd (Universiti Teknologi Malaysia); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2017","The existence of intra-plate deformation of the Sundaland platelet along its eastern edge in North Borneo, South-East Asia, makes it an interesting area that still is relatively understudied. In addition, the motion of the coastal area of North-West Borneo is directed toward a frontal fold-and-thrust belt and has been fueling a long debate on the possible geophysical sources behind it. At present this fold-and-thrust belt is not generating significant seismic activity and may also not be entirely active due to a decreasing shelfal extension from south to north. Two sets of Global Positioning System (GPS) data have been used in this study; the first covering a time period from 1999 until 2004 (ending just before the Giant Sumatra–Andaman earthquake) to determine the continuous Sundaland tectonic plate motion, and the second from 2009 until 2011 to investigate the current deformations of North Borneo. Both absolute and relative positioning methods were carried out to investigate horizontal and vertical displacements. Analysis of the GPS results indicates a clear trend of extension along coastal regions of Sarawak and Brunei in North Borneo. On the contrary strain rate tensors in Sabah reveal that only insignificant and inconsistent extension and compression occurs throughout North-West Borneo. Moreover, station velocities and rotation rate tensors on the northern part of North Borneo suggest a clockwise (micro-block) rotation. The first analysis of vertical displacements recorded by GPS in North-West Borneo points to low subsidence rates along the western coastal regions of Sabah and inconsistent trends between the Crocker and Trusmadi mountain ranges. These results have not been able to either confirm or reject the hypothesis that gravity sliding is the main driving force behind the local motions in North Borneo. The ongoing Sundaland–Philippine Sea plate convergence may also still play an active role in the present-day deformation (crustal shortening) in North Borneo and the possible clockwise rotation of the northern part of North Borneo as a micro-block. However, more observations need to be collected to determine if the northern part of North Borneo indeed is (slowly) moving independently.","GPS; Intra-plate deformation; North Borneo; Sundaland; Tectonic deformation","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:b041348a-29d8-4dc7-8343-f29412a46d87","http://resolver.tudelft.nl/uuid:b041348a-29d8-4dc7-8343-f29412a46d87","A reconfigurable cryogenic platform for the classical control of quantum processors","Homulle, Harald (TU Delft OLD QCD/Charbon Lab); Visser, Stefan; Patra, B (TU Delft OLD QCD/Charbon Lab); Ferrari, Giorgio (Politecnico di Milano); Prati, Enrico (Istituto di Fotonica e Nanotecnologie); Sebastiano, F. (TU Delft (OLD)Applied Quantum Architectures); Charbon-Iwasaki-Charbon, E. (TU Delft (OLD)Applied Quantum Architectures; TU Delft OLD QCD/Charbon Lab)","","2017","The implementation of a classical control infrastructure for large-scale quantum computers is challenging due to the need for integration and processing time, which is constrained by coherence time. We propose a cryogenic reconfigurable platform as the heart of the control infrastructure implementing the digital error-correction control loop. The platform is implemented on a field-programmable gate array (FPGA) that supports the functionality required by several qubit technologies and that can operate close to the physical qubits over a temperature range from 4 K to 300 K. This work focuses on the extensive characterization of the electronic platform over this temperature range. All major FPGA building blocks (such as look-up tables (LUTs), carry chains (CARRY4), mixed-mode clock manager (MMCM), phase-locked loop (PLL), block random access memory, and IDELAY2 (programmable delay element)) operate correctly and the logic speed is very stable. The logic speed of LUTs and CARRY4 changes less then 5%, whereas the jitter of MMCM and PLL clock managers is reduced by 20%. The stability is finally demonstrated by operating an integrated 1.2 GSa/s analog-to-digital converter (ADC) with a relatively stable performance over temperature. The ADCs effective number of bits drops from 6 to 4.5 bits when operating at 15 K.","","en","journal article","","","","","","","","","","","OLD QCD/Charbon Lab","","",""
"uuid:7c30551c-a00a-49c6-809a-48cc28a1b386","http://resolver.tudelft.nl/uuid:7c30551c-a00a-49c6-809a-48cc28a1b386","Semantic versioning and impact of breaking changes in the Maven repository","Raemaekers, S.B.A. (TU Delft Software Engineering; ING); van Deursen, A. (TU Delft Software Technology); Visser, Joost (Software Improvement Group)","","2017","Systems that depend on third-party libraries may have to be updated when updates to these libraries become available in order to benefit from new functionality, security patches, bug fixes, or API improvements. However, often such changes come with changes to the existing interfaces of these libraries, possibly causing rework on the client system. In this paper, we investigate versioning practices in a set of more than 100,000 jar files from Maven Central, spanning over 7 years of history of more than 22,000 different libraries. We investigate to what degree versioning conventions are followed in this repository. Semantic versioning provides strict rules regarding major (breaking changes allowed), minor (no breaking changes allowed), and patch releases (only backward-compatible bug fixes allowed). We find that around one third of all releases introduce at least one breaking change. We perform an empirical study on potential rework caused by breaking changes in library releases and find that breaking changes have a significant impact on client libraries using the changed functionality. We find out that minor releases generally have larger release intervals than major releases. We also investigate the use of deprecation tags and find out that these tags are applied improperly in our dataset.","Semantic versioning; Breaking changes; Software libraries","en","journal article","","","","","","","","","","Software Technology","Software Engineering","","",""
"uuid:08b8f546-7b34-4231-9bfd-4aa61835d88e","http://resolver.tudelft.nl/uuid:08b8f546-7b34-4231-9bfd-4aa61835d88e","Sentinel-1A - First precise orbit determination results","Peter-Contesse, H. (PosiTim UG); Jäggi, Adrian (University of Bern); Fernández, JJ (GMV Innovating Solutions); Escobar, D. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Ayuga, F. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Arnold, D (University of Bern); Wermuth, M. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Hackel, S. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)); Otten, M. (European Space Agency (ESA)); Simons, W.J.F. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); Hugentobler, U. (Technische Universität München); Féménias, P. (European Space Agency (ESA))","","2017","Sentinel-1A is the first satellite of the European Copernicus programme. Equipped with a Synthetic Aperture Radar (SAR) instrument the satellite was launched on April 3, 2014. Operational since October 2014 the satellite delivers valuable data for more than two years. The orbit accuracy requirements are given as 5. cm in 3D. In order to fulfill this stringent requirement the precise orbit determination (POD) is based on the dual-frequency GPS observations delivered by an eight-channel GPS receiver.The Copernicus POD (CPOD) Service is in charge of providing the orbital and auxiliary products required by the PDGS (Payload Data Ground Segment). External orbit validation is regularly performed by comparing the CPOD Service orbits to orbit solutions provided by POD expert members of the Copernicus POD Quality Working Group (QWG). The orbit comparisons revealed systematic orbit offsets mainly in radial direction (approx. 3. cm). Although no independent observation technique (e.g. DORIS, SLR) is available to validate the GPS-derived orbit solutions, comparisons between the different antenna phase center variations and different reduced-dynamic orbit determination approaches used in the various software packages helped to detect the cause of the systematic offset. An error in the given geometry information about the satellite has been found. After correction of the geometry the orbit validation shows a significant reduction of the radial offset to below 5. mm. The 5. cm orbit accuracy requirement in 3D is fulfilled according to the results of the orbit comparisons between the different orbit solutions from the QWG.","Copernicus; GPS; Orbit validation; Phase center variations; Precise orbit determination; Sentinel-1","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:bae51000-f5c7-47fe-aab4-79501d76d8de","http://resolver.tudelft.nl/uuid:bae51000-f5c7-47fe-aab4-79501d76d8de","Particle induced gamma and X-ray emission spectroscopies of lithium based alloy coatings","Laird, Jamie S. (University of Melbourne; CSIRO, Mineral Resources); Hughes, Anthony E. (CSIRO, Mineral Resources; Deakin University); Ryan, C.J. (University of Melbourne; CSIRO, Mineral Resources); Visser, P (TU Delft Materials Science and Engineering; Akzo Nobel); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2017","Lithium based inhibitors in aerospace coatings are seen as excellent replacements for their chromium counterparts which are both carcinogenic and heavier. However, Li is generally difficult to detect and following changes in its distribution due to corrosion is impossible with many standard techniques. Combining MeV Particle Induced Gamma and X-ray emission provides a powerful tool and in this paper we summarise some recent experiments on such coatings using the CSIRO Nuclear Microprobe. PIGE mapping of the LiCO3 particles and their patterning illustrates how the method will be extremely useful in monitoring surface corrosion.","Corrosion; Corrosion inhibitor; Li coatings; Lithium coatings; Nuclear Microprobe (NMP); Particle Induced X-ray Emission (PIXE); μ-Particle Induced Gamma-ray Emission (PIGE)","en","journal article","","","","","","Accepted Author Manuscript","","2019-06-09","","Materials Science and Engineering","(OLD) MSE-1","","",""
"uuid:c597758c-7b7e-4924-91a0-52d5b9badd57","http://resolver.tudelft.nl/uuid:c597758c-7b7e-4924-91a0-52d5b9badd57","Experimental and simulation-based investigations of marine diesel engine performance against static back pressure","Sapra, H.D. (TU Delft Ship Design, Production and Operations); Godjevac, M. (TU Delft Ship Design, Production and Operations); Visser, K. (TU Delft Ship Design, Production and Operations); Stapersma, D. (TU Delft Ship Design, Production and Operations); Dijkstra, Chris (Netherlands Defence Academy)","","2017","After-treatment technologies are adopted in automobiles and ships to meet strict emission regulations, which increase exhaust back pressure. Furthermore, underwater exhaust systems are employed on board ships to save space, and reduce noise and pollution on working decks. However, water at exhaust outlet creates a flow resistance for the exhaust gases, which adds to the back pressure. High back pressure reduces the operating limits of an engine, increases fuel consumption, and can lead to exhaust smoke. While the effects of back pressure were recognized earlier, there is a lack of experimentally validated research on the performance limits of a turbocharged, marine diesel engine against high back pressure for the entire operating window. The focus of this research is to provide a comprehensive understanding of back pressure effects on marine diesel engine performance, and to identify limits of acceptable back pressure along with methods to tackle high back pressure. In this work, a pulse turbocharged, medium speed, diesel engine was tested at different loads and engine speeds; against different values of static back pressure. Additionally, mean value model simulations could be validated and were used to compare the performance of a pulse and constant pressure turbocharged engine against high back pressures of 1 meter water-column (mWC), and for two different values of valve overlap. Using the validated simulation model, the conceptual basis for the engine smoke limit as well as for thermal overloading is investigated. A methodology applying the conceptual basis to define boundaries of acceptable back pressures has been presented in this paper. A combination of pulse turbocharger systems and small valve overlap showed to significantly improve back pressure handling capabilities of engines.","Back pressure; Engine experiments; Marine diesel engine performance; Mean value engine model; Thermal overloading; Underwater exhaust system","en","journal article","","","","","","","","","","","Ship Design, Production and Operations","","",""
"uuid:393b5ea4-e7d6-494a-9e1a-54d786855687","http://resolver.tudelft.nl/uuid:393b5ea4-e7d6-494a-9e1a-54d786855687","Electrochemical evaluation of corrosion inhibiting layers formed in a defect from lithium-leaching organic coatings","Visser, P. (TU Delft (OLD) MSE-6; Akzo Nobel); Meeusen, M. (TU Delft (OLD) MSE-6); Gonzalez Garcia, Y. (TU Delft (OLD) MSE-6); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2017","This work presents the electrochemical evaluation of protective layers generated in a coating defect from lithium-leaching organic coatings on AA2024-T3 aluminum alloys as a function of neutral salt spray exposure time. Electrochemical impedance spectroscopy was used to study the electrochemical properties on a macroscopic scale. An electrochemical model allowed to quantitatively link the electrochemical behavior with the physical model of the layer in the damaged area as studied by scanning electron microscopy. Local potentiodynamic polarization curves obtained from micro-cell measurements showed an increase of the passive range in the defect area due to the formation of a robust protective layer. Scanning vibrating electrode technique measurements confirmed the non-reversible long-term corrosion protection of these generated layers in the coating defect.","aluminium; coating; corrosion; inhibition; leaching; lithium","en","journal article","","","","","","Accepted Author Manuscript","","","","","(OLD) MSE-6","","",""
"uuid:a7ffb975-b4f2-498b-9864-a7b076fabda8","http://resolver.tudelft.nl/uuid:a7ffb975-b4f2-498b-9864-a7b076fabda8","1:1 Ground-track resonance in a uniformly rotating 4th degree and order gravitational field","Feng, J. (TU Delft Astrodynamics & Space Missions); Noomen, R. (TU Delft Astrodynamics & Space Missions); Hou, Xiyun (Nanjing University); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); Yuan, Jianping (Northwestern Polytechnical University)","","2017","Using a gravitational field truncated at the 4th degree and order, the 1:1 ground-track resonance is studied. To address the main properties of this resonance, a 1-degree of freedom (1-DOF) system is firstly studied. Equilibrium points (EPs), stability and resonance width are obtained. Different from previous studies, the inclusion of non-spherical terms higher than degree and order 2 introduces new phenomena. For a further study about this resonance, a 2-DOF model which includes a main resonance term (the 1-DOF system) and a perturbing resonance term is studied. With the aid of Poincaré sections, the generation of chaos in the phase space is studied in detail by addressing the overlap process of these two resonances with arbitrary combinations of eccentricity (e) and inclination (i). Retrograde orbits, near circular orbits and near polar orbits are found to have better stability against the perturbation of the second resonance. The situations of complete chaos are estimated in the e- i plane. By applying the maximum Lyapunov Characteristic Exponent (LCE), chaos is characterized quantitatively and similar conclusions can be achieved. This study is applied to three asteroids 1996 HW1, Vesta and Betulia, but the conclusions are not restricted to them.","1996 HW1; Asteroid; Betulia; Chaos; Equilibrium Points (EPs); Poincaré sections; Resonance width; Stability; Vesta","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:417b7b56-42e9-48d9-b705-6a63d4603729","http://resolver.tudelft.nl/uuid:417b7b56-42e9-48d9-b705-6a63d4603729","Combining impedance spectroscopy with optical absorption spectroscopy in the UV for biofuel composition measurement","Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials); Ghaderi, M. (TU Delft Electronic Instrumentation); Bossche, A. (TU Delft Electronic Instrumentation); Bastemeijer, J. (TU Delft Electronic Instrumentation); de Graaf, G. (TU Delft Electronic Instrumentation); Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation); Soltis, Rick (Ford Motor Company); Visser, Jaco (Ford Motor Company)","","2017","A capacitive probe is generally used in a flex-fuel engine for measuring the ethanol content in biofuel. However, the water content in biofuel of high ethanol content cannot be disregarded or considered constant and the full composition measurement of ethanol, gasoline and water in biofuel is required. Electrical impedance spectroscopy with a customized capacitive probe operating in the 10 kHz to 1 MHz frequency range is combined with optical absorption spectroscopy in the UV spectral range between 230 and 300 nm for a full composition measurement. This approach is experimentally validated using actual fuels and the results demonstrate that electrical impedance spectroscopy when supplemented with optical impedance spectroscopy can be used to fully determine the composition of the biofuel and applied for a more effective engine management. A concept for a low-cost combined measurement system in the fuel line is presented.","Biofuel composition; Fuel sensor; Impedance spectroscopy; Optical absorption spectroscopy; Ternary mixtures","en","conference paper","IEEE","","","","","Accepted author manuscript","","","","","Electronic Components, Technology and Materials","","",""
"uuid:95c563ed-5be5-44db-9365-2c136b1eadfa","http://resolver.tudelft.nl/uuid:95c563ed-5be5-44db-9365-2c136b1eadfa","Particle characterisation and depletion of Li2CO3 inhibitor in a polyurethane coating","Hughes, Anthony (CSIRO, Mineral Resources; Deakin University); Laird, James (CSIRO, Mineral Resources); Ryan, Chris (CSIRO, Mineral Resources); Visser, P. (TU Delft (OLD) MSE-6); Terryn, H.A. (TU Delft (OLD) MSE-1; Vrije Universiteit Brussel); Mol, J.M.C. (TU Delft (OLD) MSE-6)","","2017","The distribution and chemical composition of inorganic components of a corrosion-inhibiting primer based on polyurethane is determined using a range of characterisation techniques. The primer consists of a Li2CO3 inhibitor phase, along with other inorganic phases including TiO2, BaSO4 and Mg-(hydr)oxide. The characterisation techniques included particle induced X-ray and γ-ray emission spectroscopies (PIXE and PIGE, respectively) on a nuclear microprobe, as well as SEM/EDS hyperspectral mapping. Of the techniques used, only PIGE was able to directly map the Li distribution, although the distribution of Li2CO3 particles could be inferred from SEM through using backscatter contrast and EDS. Characterisation was also performed on a primer coating that had undergone leaching in a neutral salt spray test for 500 h. Overall, it was found that Li2CO3 leaching resulted in a uniform depletion zone near the surface, but also much deeper local depletion, which is thought to be due to the dissolution of clusters of Li2CO3 particles that were connected to the external surface/electrolyte interface","primer; Li-inhibited; AA2024; polyurethane; SEM; EDS; PIXE; PIGE; leaching; pigments","en","journal article","","","","","","","","","","","(OLD) MSE-6","","",""
"uuid:7e7b99f4-c497-4291-b152-8d82d1258dc3","http://resolver.tudelft.nl/uuid:7e7b99f4-c497-4291-b152-8d82d1258dc3","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","poster","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"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:8e8d0cc5-4e45-49c7-b884-872bc30608e9","http://resolver.tudelft.nl/uuid:8e8d0cc5-4e45-49c7-b884-872bc30608e9","Systematic functional perturbations uncover a prognostic genetic network driving human breast cancer","Gallenne, Tristan (Netherlands Cancer Institute; Merus BV); Ross, Kenneth N. (Massachusetts General Hospital; Harvard Medical School); Visser, Nils L. (Netherlands Cancer Institute); Desmet, Christian J. (Netherlands Cancer Institute); Wittner, Ben S. (Massachusetts General Hospital; Harvard Medical School); Wessels, L.F.A. (TU Delft Pattern Recognition and Bioinformatics; Netherlands Cancer Institute); Ramaswamy, Sridhar (Massachusetts General Hospital; Harvard Medical School; Broad Institute of MIT and Harvard; Harvard-Ludwig Center for Cancer Research); Peeper, Daniel Ss (Netherlands Cancer Institute)","","2017","Prognostic classifiers conceivably comprise biomarker genes that functionally contribute to the oncogenic and metastatic properties of cancer, but this has not been investigated systematically. The transcription factor Fra-1 not only has an essential role in breast cancer, but also drives the expression of a highly prognostic gene set. Here, we systematically perturbed the function of 31 individual Fra-1-dependent poor-prognosis genes and examined their impact on breast cancer growth in vivo. We find that stable shRNA depletion of each of nine individual signature genes strongly inhibits breast cancer growth and aggressiveness. Several factors within this ninegene set regulate each other's expression, suggesting that together they form a network. The nine-gene set is regulated by estrogen, ERBB2 and EGF signaling, all established breast cancer factors. We also uncover three transcription factors, MYC, E2F1 and TP53, which act alongside Fra-1 at the core of this network. ChIP-Seq analysis reveals that a substantial number of genes are bound, and regulated, by all four transcription factors. The nine-gene set retains significant prognostic power and includes several potential therapeutic targets, including the bifunctional enzyme PAICS, which catalyzes purine biosynthesis. Depletion of PAICS largely cancelled breast cancer expansion, exemplifying a prognostic gene with breast cancer activity. Our data uncover a core genetic and prognostic network driving human breast cancer. We propose that pharmacological inhibition of components within this network, such as PAICS, may be used in conjunction with the Fra-1 prognostic classifier towards personalized management of poor prognosis breast cancer.","Breast cancer; Metastasis; Prognosis; Tumor biology","en","journal article","","","","","","","","","","","Pattern Recognition and Bioinformatics","","",""
"uuid:a39af828-67ed-4b1c-a126-c8f5ef9d4b08","http://resolver.tudelft.nl/uuid:a39af828-67ed-4b1c-a126-c8f5ef9d4b08","A novel machine learning model to predict abnormal Runway Occupancy Times and observe related precursors","Herrema, Floris Friso (EUROCONTROL); Treve, V (EUROCONTROL); Desart, B (EUROCONTROL); Curran, R. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations)","","2017","Accidents on the runway triggered the development and implementation of mitigation strategies. Therefore, the airline industry is moving toward proactive risk management, which aims to identify and predict risk percursors and to mitigate risks before accidents occur. For certain predictions Machine Learning techniques can be used. Although many studies have explored and applied novel Machine Learning techniques on different aircraft Radar and operational Taxi data, the identification and prediction of abnormal Runway Occupancy Times and the observation of related percursors are not well developed. In our previous papers, three feasible methods were introduced: Lasso, Multi-Layer Perceptiona and Neural Networks to predict the Taxi-Out Time on the taxiway and the time to Fly and True Airspeed profile on final approach. This paper presents a new Machine Learing method, where we merge these feasible Machine Learning techniques for prediction the abnormal Runway Occupancy times of unique radar data patterns. Additionally we use in this study the Regression Tree method to observe key related precursors extracted from the top 10 features. Compared with existing methods, the new method no longer requires predefined criteria or domain knowledge. Tests were conductioned using runway and final approach aircraft radar data consisting of 78,321 Charles de Gaulle flights and were benchmarked against 500,000 Vienna flights.","combined machine learning technique; (abnormal) AROT; regression tree and precursors","en","conference paper","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:126706e8-456f-47d5-902d-f8c57a6efbac","http://resolver.tudelft.nl/uuid:126706e8-456f-47d5-902d-f8c57a6efbac","IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition","Harkes, D.C. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Müller, Peter (editor)","2017","Derived values are values calculated from base values. They can be expressed with views in relational databases, or with expressions in incremental or reactive programming. However, relational views do not provide multiplicity bounds, and incremental and reactive programming require significant boilerplate code in order to encode bidirectional derived values. Moreover, the composition of various strategies for calculating derived values is either disallowed, or not checked for producing derived values which will be consistent with the derived values they depend upon. In this paper we present IceDust2, an extension of the declarative data modeling language IceDust with derived bidirectional relations with multiplicity bounds and support for statically checked composition of calculation strategies. Derived bidirectional relations, multiplicity bounds, and calculation strategies all influence runtime behavior of changes to data, leading to hundreds of possible behavior definitions. IceDust2 uses a product-line based code generator to avoid explicitly defining all possible combinations, making it easier to reason about correctness. The type system allows only sound composition of strategies and guarantees multiplicity bounds. Finally, our case studies validate the usability of IceDust2 in applications.","Incremental Computing; Data Modeling; Domain Specific Language","en","conference paper","Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, Germany","","","","","","","","","","Programming Languages","","",""
"uuid:be54178e-9c6d-4c6e-8cc1-ad875386c2c7","http://resolver.tudelft.nl/uuid:be54178e-9c6d-4c6e-8cc1-ad875386c2c7","The semantics of name resolution in Grace","Vergu, V.A. (TU Delft Programming Languages); Haisma, M.A. (TU Delft Electrical Engineering, Mathematics and Computer Science); Visser, Eelco (TU Delft Programming Languages)","Ancona, Davide (editor)","2017","Grace is a dynamic object oriented programming language
designed to aid programming education. We present a formal
model of and give an operational semantics for its object
model and name resolution algorithm. Our main contributions
are a systematic model of Grace’s name resolution using
scope graphs, relating linguistic features to other languages,
and an operationalization of this model in the form of an
operational semantics which is readable and executable. The
semantics are extensively tested against a reference Grace
implementation.","object orientation; dynamic semantics; name resolution","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","Programming Languages","","",""
"uuid:3b0194ed-0690-48fb-a3df-a0a30e0cca13","http://resolver.tudelft.nl/uuid:3b0194ed-0690-48fb-a3df-a0a30e0cca13","IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition (Artifact)","Harkes, D.C. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","","2017","","","","journal article","","","","","","","","","","","Programming Languages","","",""
"uuid:73738044-c41a-4b8d-958f-c70d0fa2ceee","http://resolver.tudelft.nl/uuid:73738044-c41a-4b8d-958f-c70d0fa2ceee","CHAMP, GRACE, GOCE and Swarm Thermosphere Density Data with Improved Aerodynamic and Geometry Modelling","March, G. (TU Delft Astrodynamics & Space Missions); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions)","","2017","Since 2000, accelerometers on board of the CHAMP, GRACE, GOCE and Swarm satellites have provided highresolution thermosphere density data, improving knowledge on atmospheric dynamics and coupling processes in the thermosphere-ionosphere layer. Most of the research has focused on relative changes in density. Scale differences between datasets and models have been largely neglected or removed using ad hoc scale factors. The origin of these variations arises from errors in the aerodynamic modelling, specifically in the modelling of the satellite outer surface geometry and of the gas-surface interactions. Therefore, in order to further improve density datasets and models that rely on these datasets, and in order to make them align with each other in terms of the absolute scale of the density, it is first required to enhance the geometry modelling. Once accurate geometric models of the satellites are available, it will be possible to enhance the characterization of the gassurface interactions, and to enhance the satellite aerodynamic modelling. This presentation offers an accurate approach for determining aerodynamic forces and torques and improved density data for CHAMP, GRACE, GOCE and Swarm. Through detailed high fidelity 3-D CAD models and Direct Simulation Monte Carlo computations, flow shadowing and complex concave geometries can be investigated. This was not possible with previous closed-form solutions, especially because of the low fidelity geometries and the incapability to introduce shadowing effects. This inaccurate geometry and aerodynamic modelling turned out to have relevant influence on derived densities, particularly for satellites with complex elongated shapes and protruding instruments, beams and antennae. Once the geometry and aerodynamic modelling have been enhanced with the proposed approach, the accelerometer data can be reprocessed leading to 81 higher fidelity density estimates. An overview of achieved improvements and dataset comparisons will be provided together with an introduction to the next gas-surface interactions research phase.","","en","poster","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:37de4d8b-4018-443a-8fc9-85054446013b","http://resolver.tudelft.nl/uuid:37de4d8b-4018-443a-8fc9-85054446013b","Multi-domain spectroscopy for composition measurement of water-containing bio-ethanol fuel","Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials); de Graaf, G. (TU Delft Electronic Instrumentation); Bossche, A. (TU Delft Electronic Instrumentation); Bastemeijer, J. (TU Delft Electronic Instrumentation); Ghaderi, M. (TU Delft Electronic Instrumentation); Wolffenbuttel, F.S. (Haagse Hogeschool); Visser, J. (Ford Motor Company); Soltis, R. (Ford Motor Company); Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation)","","2017","Measuring the ethanol/water ratio in biofuel of high ethanol content, such as E85, is important when used in a flex-fuel engine. A capacitive probe is generally used for measuring the ethanol/gasoline ratio. However, the water content in E85 biofuel cannot be disregarded or considered constant and full composition measurement of biofuel is required. Electric impedance spectroscopy with a customized coaxial probe operating in the 10 kHz to 1 MHz frequency range was investigated. An in-depth investigation of the electrical impedance domain has led to the conclusion that additional information is required to unambiguously determine the composition of the ternary biofuel mixture. Among the different options of measurement domains and techniques, optical absorption spectroscopy in the UV spectral range between 230 and 300 nm was found to be the most appropriate. The typical absorbance in the UV range is highly dominated by gasoline, while ethanol and water are almost transparent. This approach is experimentally validated using actual fuels.","Fuel-sensor; Impedance spectroscopy; Biofuel; UV absorption spectroscopy; Composition analysis","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:e16cdc49-6e96-4828-a68d-f4c5266b9128","http://resolver.tudelft.nl/uuid:e16cdc49-6e96-4828-a68d-f4c5266b9128","Microstructure for Thermal Impedance Spectroscopy for Biofuel Composition Measurement","Jiang, Bo (Student TU Delft); Ghaderi, M. (TU Delft Electronic Instrumentation); Bossche, A. (TU Delft Electronic Instrumentation); Visser, Jaco H. (Ford Motor Company); Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation)","","2017","Thermal impedance spectroscopy has been investigated as a non-destructive technique to determine the composition of ternary mixtures of biofuels. The principle of the thermal conductivity detector has been extended for measuring both the thermal conductivity and the thermal capacity of biofuel in the range between 1 to 100 Hz, using an AC-operated polysilicon heater for injecting a sinusoidal heat flux, and another polysilicon strip at a well-defined spacing or thermopile sensors for measuring the in-phase and quadrature components of the resulting AC temperature difference.","thermal impedance spectroscopy; ternary mixture; conductivity; thermopile sensors; thermal conductivity detector","en","conference paper","","","","","","","","","","","Electronic Instrumentation","","",""
"uuid:3a78993b-fd68-49e0-8550-c00400f9cf8e","http://resolver.tudelft.nl/uuid:3a78993b-fd68-49e0-8550-c00400f9cf8e","An Efficient Application of the MOEA/D Algorithm for Designing Noise Abatement Departure Trajectories","Ho-Huu, V. (TU Delft Air Transport & Operations); Hartjes, S. (TU Delft Air Transport & Operations); Visser, H.G. (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2017","In an effort to allow to increase the number of aircraft and airport operations while mitigating their negative impacts (e.g., noise and pollutant emission) on near-airport communities, the optimal design of new departure routes with less noise and fuel consumption becomes more important. In this paper, a multi-objective evolutionary algorithm based on decomposition (MOEA/D), which recently emerged as a potential method for solving multi-objective optimization problems (MOPs), is developed for this kind of problem. First, to minimize aircraft noise for departure routes while taking into account the interests of various stakeholders, bi-objective optimization problems involving noise and fuel consumption are formulated where both the ground track and vertical profile of a departure route are optimized simultaneously. Second, in order to make the design space of vertical profiles feasible during the optimization process, a trajectory parameterization technique recently proposed is employed. Furthermore, some modifications to MOEA/D that are aimed at significantly reducing the computational cost are also introduced. Two different examples of departure routes at Schiphol Airport in the Netherlands are shown to demonstrate the applicability and reliability of the proposed method. The simulation results reveal that the proposed method is an effective and efficient approach for solving this kind of problem.","departure routes; trajectory optimization; noise abatement; Structural optimization; fuel consumption; MOEA/D","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:e373683e-ac75-4100-97d9-1b0d7edb6d77","http://resolver.tudelft.nl/uuid:e373683e-ac75-4100-97d9-1b0d7edb6d77","Design and control of hybrid power and propulsion systems for smart ships: A review of developments","Geertsma, R.D. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Visser, K. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Hopman, J.J. (TU Delft Marine and Transport Technology; TU Delft Ship Design, Production and Operations)","","2017","The recent trend to design more efficient and versatile ships has increased the variety in hybrid propulsion and power supply architectures. In order to improve performance with these architectures, intelligent control strategies are required, while mostly conventional control strategies are applied currently. First, this paper classifies ship propulsion topologies into mechanical, electrical and hybrid propulsion, and power supply topologies into combustion, electrochemical, stored and hybrid power supply. Then, we review developments in propulsion and power supply systems and their control strategies, to subsequently discuss opportunities and challenges for these systems and the associated control. We conclude that hybrid architectures with advanced control strategies can reduce fuel consumption and emissions up to 10–35%, while improving noise, maintainability, manoeuvrability and comfort. Subsequently, the paper summarises the benefits and drawbacks, and trends in application of propulsion and power supply technologies, and it reviews the applicability and benefits of promising advanced control strategies. Finally, the paper analyses which control strategies can improve performance of hybrid systems for future smart and autonomous ships and concludes that a combination of torque, angle of attack, and Model Predictive Control with dynamic settings could improve performance of future smart and more autonomous ships.","Control system technologies; Defence industry; Electrical propulsion; Energy storage; Hybrid propulsion; Marine systems; Non-linear control systems; Power systems; Ship design; Shipbuilding industry","en","review","","","","","","","","","","Marine and Transport Technology","Ship Design, Production and Operations","","",""
"uuid:feeb6cf7-7a44-4863-ad91-24c8ba6219d1","http://resolver.tudelft.nl/uuid:feeb6cf7-7a44-4863-ad91-24c8ba6219d1","Pitch control for ships with diesel mechanical and hybrid propulsion: Modelling, validation and performance quantification","Geertsma, R.D. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Visser, K. (TU Delft Ship Design, Production and Operations; Netherlands Defence Academy); Loonstijn, M.A. (TU Delft Ship Design, Production and Operations); Hopman, J.J. (TU Delft Marine and Transport Technology; TU Delft Ship Design, Production and Operations)","","2017","Ships, in particular service vessels, need to reduce fuel consumption, emissions and cavitation noise while maintaining manoeuvrability and preventing engine overloading. Diesel mechanical propulsion with controllable pitch propellers can provide high fuel efficiency with good manoeuvrability. However, the conventional control strategy with fixed combinator curves limits control freedom in trading-off performance characteristics. In order to evaluate performance of current state-of-the-art and future alternative propulsion systems and their control, a validated propulsion system model is required. To this end, this paper proposes a propulsion model with a Mean Value First Principle (MVFP) diesel engine model that can be parameterised with publicly available manufacturer data and further calibrated with obligatory FAT measurements. The model uses a novel approach to predict turbocharger performance based on Zinner blowdown, the Büchi power and flow balance and the elliptic law for turbines, and does not require detailed information such as compressor and turbine maps. This model predicts system performance within 5% of actual measurements during Factory Acceptance Tests (FAT) of the diesel engines and Sea Acceptance Tests (SAT) of a case study navy ship. Moreover, this paper proposes measures of performance that objectively quantify the fuel consumption, acceleration rate, engine thermal loading and propeller cavitation during trial, design and off-design conditions in specified benchmark manoeuvres, within an hour simulation time. In our experiments, we find that, depending on the control strategy, up to 30% of fuel can be saved, thermal engine loading can be reduced by 90. K, and acceleration time by 50% for a case study Holland class patrol vessel.","Marine systems; Mechanical propulsion; Modelling and simulation; Non-linear control systems; Power systems; Validation","en","journal article","","","","","","","","","","Marine and Transport Technology","Ship Design, Production and Operations","","",""
"uuid:41685693-7431-441e-9ad5-368b132c308b","http://resolver.tudelft.nl/uuid:41685693-7431-441e-9ad5-368b132c308b","Gravity field models derived from Swarm GPS data","De Teixeira Da Encarnação, J. (TU Delft Astrodynamics & Space Missions); Arnold, Daniel (University of Bern); Bezděk, Aleš (Czech Academy of Sciences and Arts); Dahle, Christoph (University of Bern); Doornbos, E.N. (TU Delft Astrodynamics & Space Missions); van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions); Jäggi, Adrian (University of Bern); Mayer-Gürr, Torsten (Graz University of Technology); Sebera, Josef (Czech Academy of Sciences and Arts); Visser, P.N.A.M. (TU Delft Astrodynamics & Space Missions); Zehentner, Norbert (Graz University of Technology)","","2016","It is of great interest to numerous geophysical studies that the time series of global gravity field models derived from Gravity Recovery and Climate Experiment (GRACE) data remains uninterrupted after the end of this mission. With this in mind, some institutes have been spending efforts to estimate gravity field models from alternative sources of gravimetric data. This study focuses on the gravity field solutions estimated from Swarm global positioning system (GPS) data, produced by the Astronomical Institute of the University of Bern, the Astronomical Institute (ASU, Czech Academy of Sciences) and Institute of Geodesy (IfG, Graz University of Technology). The three sets of solutions are based on different approaches, namely the celestial mechanics approach, the acceleration approach and the short-arc approach, respectively. We derive the maximum spatial resolution of the time-varying gravity signal in the Swarm gravity field models to be degree 12, in comparison with the more accurate models obtained from K-band ranging data of GRACE. We demonstrate that the combination of the GPS-driven models produced with the three different approaches improves the accuracy in all analysed monthly solutions, with respect to any of them. In other words, the combined gravity field model consistently benefits from the individual strengths of each separate solution. The improved accuracy of the combined model is expected to bring benefits to the geophysical studies during the period when no dedicated gravimetric mission is operational.","GRACE; Gravity field; High-low satellite-to-satellite tracking; Swarm","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:75e584fa-9f2d-4411-a04a-cbd685e8b418","http://resolver.tudelft.nl/uuid:75e584fa-9f2d-4411-a04a-cbd685e8b418","A Cryogenic 1 GSa/s, Soft-Core FPGA ADC for Quantum Computing Applications","Homulle, Harald (TU Delft OLD QCD/Charbon Lab; TU Delft QuTech Advanced Research Centre); Visser, S.M.C. (TU Delft OLD QCD/Charbon Lab; TU Delft QuTech Advanced Research Centre); Charbon-Iwasaki-Charbon, E. (TU Delft OLD QCD/Charbon Lab; TU Delft QuTech Advanced Research Centre)","","2016","We propose an analog-to-digital converter (ADC) architecture, implemented in an FPGA, that is fully reconfigurable and easy to calibrate. This approach allows to alter the design, according to the system requirements, with simple modifications in the firmware. Therefore it can be used in a wide range of operating conditions, including a harsh cryogenic environment. The proposed architecture employs time-to-digital converters (TDCs) and phase interpolation techniques to reach a sampling rate, higher than the clock frequency (maximum 400 MHz), up to 1.2 GSa/s. The resulting FPGA ADC can achieve a 6 bit resolution (ENOB) over a 0.9 to 1.6 V input range and an effective resolution bandwidth (ERBW) of 15 MHz. This implies that the ADC has an effective Nyquist rate of 30 MHz, with an oversampling ratio of $40\times $. The system non-linearities are less than 1 LSB. The main advantages of this architecture are its scalability and reconfigurability, enabling applications with changing demands on one single platform.","ADC; analog-to-digital converter; calibration; cryogenic; FPGA; reconfigurable; TDC; time-to-digital converter","en","journal article","","","","","","","","","","","OLD QCD/Charbon Lab","","",""
"uuid:bab45902-284f-4f6b-9362-be5b3df7ff20","http://resolver.tudelft.nl/uuid:bab45902-284f-4f6b-9362-be5b3df7ff20","A scalable infrastructure for teaching concepts of programming languages in Scala with WebLab: An experience report","Van Der Lippe, Tim (Student TU Delft); Smith, Thomas (Student TU Delft); Pelsmaeker, Daniël (Student TU Delft); Visser, Eelco (TU Delft Programming Languages)","","2016","In this paper, we report on our experience in teaching a course on concepts of programming languages at TU Delft based on Krishnamurthi's PAPL book with the definitional interpreter approach using Scala as meta-language and using the WebLab learning management system. In particular, we discuss our experience with encoding of definitional interpreters in Scala using case classes, pattern matching, and recursive functions; offering this material in the web-based learning management system WebLab; automated grading and feedback of interpreter submissions using unit tests; testing tests to force students to formulate tests, instead of just implementing interpreters; generation of tests based on a reference implementation to reduce the effort of producing unit tests; and the construction of a product line of interpreters in order to maximize reuse and consistency between reference implementations.","Concepts of programming languages; Definitional interpreters; Scala; Teaching; Testing; WebLab","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:fb5ffb44-712d-430b-b0cf-f9c47d7479c7","http://resolver.tudelft.nl/uuid:fb5ffb44-712d-430b-b0cf-f9c47d7479c7","Principled Syntactic Code Completion using Placeholders","de Souza Amorim, L.E. (TU Delft Programming Languages); Erdweg, S.T. (TU Delft Programming Languages); Wachsmuth, G.H. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Varro, D. (editor); Balland, E. (editor); van der Storm, T. (editor)","2016","Principled syntactic code completion enables developers to change source code by inserting code templates, thus increasing developer efficiency and supporting language exploration. However, existing code completion systems are ad-hoc and neither complete nor sound. They are not complete and only provide few code templates for selected programming languages. They also are not sound and propose code templates that yield invalid programs when inserted. This paper presents a generic framework that automatically derives complete and sound syntactic code completion from the syntax definition of arbitrary languages. A key insight of our work is to provide an explicit syntactic representation for incomplete programs using placeholders. This enables us to address the following challenges for code completion separately: (i) completing incomplete programs by replacing placeholders with code templates, (ii) injecting placeholders into complete programs to make them incomplete, and (iii) introducing lexemes and placeholders into incorrect programs through error-recovery parsing to make them correct so we can apply one of the previous strategies. We formalize our framework and provide an implementation in Spoofax.","Code completion; Ides; Language workbenches","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Programming Languages","","",""
"uuid:aa447937-0d1c-4477-ab4c-f227bbaf90cd","http://resolver.tudelft.nl/uuid:aa447937-0d1c-4477-ab4c-f227bbaf90cd","IceDust: Incremental and eventual computation of derived values in persistent object graphs","Harkes, D.C. (TU Delft Programming Languages); Groenewegen, D.M. (TU Delft Programming Languages); Visser, Eelco (TU Delft Programming Languages)","Krishnamurthi, Shriram (editor); Lerner, Benjamin S. (editor)","2016","Derived values are values calculated from base values. They can be expressed in object-oriented languages by means of getters calculating the derived value, and in relational or logic databases by means of (materialized) views. However, switching to a different calculation strategy (for example caching) in object-oriented programming requires invasive code changes, and the databases limit expressiveness by disallowing recursive aggregation. In this paper, we present IceDust, a data modeling language for expressing derived attribute values without committing to a calculation strategy. IceDust provides three strategies for calculating derived values in persistent object graphs: Calculate-on-Read, Calculate-on-Write, and Calculate-Eventually. We have developed a path-based abstract interpretation that provides static dependency analysis to generate code for these strategies. Benchmarks show that different strategies perform better in different scenarios. In addition we have conducted a case study that suggests that derived value calculations of systems used in practice can be expressed in IceDust.","Data modeling; Domain specific language; Incremental computing","en","conference paper","Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing","","","","","","","","","","Programming Languages","","",""
"uuid:8cfac577-b66d-402d-ad40-ff59c6f42291","http://resolver.tudelft.nl/uuid:8cfac577-b66d-402d-ad40-ff59c6f42291","Scopes describe frames: A uniform model for memory layout in dynamic semantics","Poulsen, C.B. (TU Delft Programming Languages); Neron, P.J.M. (French Network and Information Security Agency (ANSSI); Tolmach, Andrew (Portland State University); Visser, Eelco (TU Delft Programming Languages)","Krishnamurthi, Shriram (editor); Lerner, Benjamin S. (editor)","2016","Semantic specifications do not make a systematic connection between the names and scopes in the static structure of a program and memory layout, and access during its execution. In this paper we introduce a systematic approach to the alignment of names in static semantics and memory in dynamic semantics, building on the scope graph framework for name resolution. We develop a uniform memory model consisting of frames that instantiate the scopes in the scope graph of a program. This provides a language-independent correspondence between static scopes and run-time memory layout, and between static resolution paths and run-time memory access paths. The approach scales to a range of binding features, supports straightforward type soundness proofs, and provides the basis for a language-independent specification of sound reachability-based garbage collection.","Dynamic semantics; Memory layout; Operational semantics; Scope graphs; Type soundness","en","conference paper","Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing","","","","","","","","","","Programming Languages","","",""
"uuid:85913c20-849d-4ae6-99ee-1686587c3a0a","http://resolver.tudelft.nl/uuid:85913c20-849d-4ae6-99ee-1686587c3a0a","Green energy based inductive Self-Healing highways of the future","Prasanth, V. (TU Delft DC systems, Energy conversion & Storage); Scheele, Natalia (Student TU Delft); Visser, Erwin (Student TU Delft); Shekhar, A. (TU Delft DC systems, Energy conversion & Storage); Chandra Mouli, G.R. (TU Delft DC systems, Energy conversion & Storage); Bauer, P. (TU Delft DC systems, Energy conversion & Storage); Silvester, S. (TU Delft Applied Ergonomics and Design)","","2016","This paper deals with a green energy highway in the Netherlands. Here, the development of electric mobility and self-driving cars is introduced. The ideas of wireless power integration with green energy technologies - solar and wind is considered. In case of wind energy, conventional turbines and bladeless vortex are considered as options. Solaroads along the emergency lanes are also investigated. A Dutch highway A12 is considered as a case study and sizing of these energy sources for electric mobility is considered. A grid power demand profile is considered and number of EVs that can be charged hourly is calculated. A preliminary investigation of the combination of IPT and Self-Healing roads is considered in this study.","Asphalt; Roads; State of charge; Electric Vehicles; Green products","en","conference paper","IEEE","","","","","Accepted Author Manuscript","","","","","DC systems, Energy conversion & Storage","","",""
"uuid:1d62a001-7eb5-4faa-9d55-cbe9431c5eee","http://resolver.tudelft.nl/uuid:1d62a001-7eb5-4faa-9d55-cbe9431c5eee","Modelling of injection processes in ladle metallurgy","Visser, H. (TU Delft OLD Metals Processing, Microstructures and Properties; TU Delft (OLD) MSE-3)","Boom, R. (promotor); Yang, Y. (copromotor); Delft University of Technology (degree granting institution)","2016","Ladle metallurgical processes constitute a portion of the total production chain of steel from iron ore. With these batch processes, the hot metal or steel transfer ladle is being used as a reactor vessel and a reagent is often injected in order to bring the composition of the hot metal or steel to the specification of the final product. To control and further improve these processes, often use is made of models that predict the course of the processes. Models derived from first principles of mass and energy transport have the advantage over empirical descriptions that predictions outside the established window of operation can be made. The establishment of such a model, however, requires deeper knowledge of the underlying thermo-chemical processes. The purpose of this work is to provide a uniform method for the development of a model of injection processes in the ladle metallurgy. This will give direction to the development of new models, and will clarify blind spots in the existing knowledge for which further research is required. It is chosen to study two ladle treatments and to develop a reactor model of these, namely the desulphurisation of hot metal by the injection of magnesium and lime, and the modification of inclusions in aluminium killed steel by the injection of calcium.
The hot metal desulphurisation has been studied by microscopic analysis of hot metal samples taken during different heats. The top layer of the bath, where the hot metal is in contact with the slag layer, has also been studied. From these analyses, it follows that during the injection of magnesium, magnesium sulphide particles are formed which continue to be present for some time in the hot metal, grow and later on rise out of the bath. This corresponds to the mechanism as has been proposed by G. Irons and R. Guthrie, based on their experiments on a laboratory scale. Due to the differences in scale, however, the accumulation of magnesium sulphide particles in the hot metal plays a significant role in the explanation of sulphur levels observed in the industrial desulphurisation process. The measurements furthermore show that the rise of the particles to the slag layer is partially obstructed by graphite and Ti (C, N) particles that accumulate in the colder surface layer of the hot metal. This creates a layer with a high concentration of MgS-particles that remain unnoticed but can lead to undesirable sulphur pick up in the converter process. It also appears that the MgS particles that rise to the slag layer react with co-injected lime to form MgO and CaS. In order to prevent sulphur reversal by oxidation of MgS in the ambient air, lime should always be injected in a slight excess. During the injection process, iron droplets are thrown up from the spout area. These droplets slowly sink through the slag layer and do not make it back to the hot metal before the end of the injection process. Based on this it can be explained how the hot metal loss depends on the amount of injected magnesium, the hot metal temperature, and the hot metal titanium content. Because these droplets are entrained with the sulphide containing slag during deslagging, this presents a major cost in the form of loss of hot metal.
Based on these findings, a reactor model of the hot metal desulphurisation has been developed The mixing in the hot metal bath has been described as an ideally mixed tank reactor, wherein the residence time of injected magnesium and lime has been described by a generic model of the bubble plume. An important aspect of the model is that the total sulphur content is formed by the sulphur that is dissolved in the hot metal and the sulphur which is bound in the MgS particles suspended in the hot metal. The specific surface area of the MgS particles is derived from the microscopic observations and the flotation of the MgS particles is described by a first order rate equation. The predicted development of the concentrations of magnesium and sulphur during the duration of the injection is in good agreement with the measurements which have been made with two treatments.
The calcium treatment of aluminium killed steel has been extensively studied by W. Tiekink. Based on the measurements carried out by him on laboratory and industrial scale, the steel bath in the ladle is divided into two reaction zones: a zone plume in which the steel is saturated with calcium and a bulk zone in which initially no calcium is present. In the plume zone CaO and CaS are deposited on the Al2O3 particles. Induced by the bubble plume resulting from the calcium injection, a circulating current flows between these zones. Each zone is modelled by a continuously stirred, ideally mixed tank reactor (CISTR). Carried along with this circulating current, the particles are alternately exposed to high and low levels of calcium activity which ultimately results in a variation in size and composition of the particles. This is modelled by taking a population balance of the particles for each zone containing terms for convection and growth by deposition of CaO and CaS. The results of the model are consistent with the observations when it is assumed that the solubility of calcium in steel amounts to 1 ppm. There is a good prediction of particle sizes and composition, but the CaS content of the particles is slightly overestimated by the model. This is explained by the pick up of oxygen at the surface of the steel which is not yet taken into account in the model.
The final conclusion of this work is that the chemical conversion of the hot metal and steel during ladle metallurgical injection processes can be well modelled with a detailed description of nucleation, growth and rise of the product particles in conjunction with a relatively simple macroscopic description of the flow field in the ladle. This can best be achieved by providing a population balance of the product particles in which, to the extent appropriate, terms for nucleation, growth, convection and flotation are included. The flow field in the ladle then is modelled using three CISTR's coupled by circulating currents of liquid metal. These CISTR's represent the three zones that can be distinguished in a ladle stirred by a bubble plume; the plume zone, the recirculation zone and the stagnant zone above the bottom of the ladle.
This paper presents how Machine Learning (ML) techniques may be used for predicting the T2F and TAS profile on final approach. Different ML techniques will be assessed on their forecast performance, computational time and amount of data needed for delivering a reliable prediction. The techniques will be applied on 2 different major European airports traffic and will be benchmarked against Optimized Runway Delivery (ORD) study using a Model Based Approach (MBA) for deriving the T2F and TAS. As a result the most efficient ML techniques will be applied on two case studies for predicting the T2F and TAS.
Breach growth models are used to predict the breach dimensions and to estimate the flow through the breach. All assessed models pretty well succeed in this. However, starting from various premises and taking into account a (limited) set of different breaching mechanisms, the use of today’s state-of-the-art breach growth models is not entirely trouble free
400 kg m-3). This paper aims to increase the total fly ash content relative to the clinker content, while simultaneously minimizing the total powder content in the concrete to values lower than 300 kg m-3. The motivation for decreasing the total powder content using fly ash as a cement replacement is based on the fact that concrete structures often have an ‘overstrength’ related to excess cement. Consequently, there is potential for using lower amounts of clinker and replacing it by filler, which can reduce the amount of primary raw materials used and CO2 related to clinker production. However, the question arises if sufficient durability of this ‘high filler’ concrete is achieved. In this paper chloride penetration resistance is measured by rapid chloride migration and diffusion tests on both laboratory mixes and samples from pilot projects. Also, electrical resistivity and polarization-and-fluorescence microscopy (PFM) are used to evaluate the development of the microstructure in time. The results show possibilities and limitations of high filler concrete in achieving long service life.","","en","journal article","Heron","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","","",""
"uuid:c46d95b0-aae6-4dd9-aa9a-759bee35d577","http://resolver.tudelft.nl/uuid:c46d95b0-aae6-4dd9-aa9a-759bee35d577","Natural and Flexible Error Recovery for Generated Modular Language Environments","De Jonge, M.; Kats, L.C.L.; Soderberg, E.; Visser, E.","","2012","Author's version of the work published in: ACM Transactions on Programming Languages and Systems (TOPLAS), 34 (4), 2012; doi:10.1145/2400676.2400678. Integrated development environments (IDEs) increase programmer productivity, providing rapid, interactive feedback based on the syntax and semantics of a language. Unlike conventional parsing algorithms, scannerless generalized-LR parsing supports the full set of context-free grammars, which is closed under composition, and hence can parse languages composed from separate grammar modules. To apply this algorithm in an interactive environment, this paper introduces a novel error recovery mechanism. Our approach is language-independent, and relies on automatic derivation of recovery rules from grammars. By taking layout information into consideration it can efficiently suggest natural recovery suggestions.","languages; algorithms; design; error recovery; generalized parsing","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:eaf6f0c1-a653-4415-a1a0-52217e4a9b72","http://resolver.tudelft.nl/uuid:eaf6f0c1-a653-4415-a1a0-52217e4a9b72","Measuring Library Stability Through Historical Version Analysis","Raemaekers, S.B.A.; Van Deursen, A.; Visser, J.","","2012","Preprint of paper published in: ICSM 2012 - Proceedings of the IEEE International Conference on Software Maintenance, 23-28 September 2012; doi:10.1109/ICSM.2012.6405296 Backward compatibility is a major concern for any library developer. In this paper, we evaluate how stable a set of frequently used third-party libraries is in terms of method removals, implementation change, the ratio of change in old methods to change in new ones and the percentage of new methods in each snapshot. We provide a motivating example of a commercial company which demonstrates several issues associated with the usage of third-party libraries. To obtain dependencies from software systems we developed a framework which extracts dependencies from Maven build files and which analyzes system and library code. We propose four metrics which provide different insights in the implementation and interface stability of a library. The usage frequency of library methods is utilized as a weight in the final metric and is obtained from a dataset of more than 2300 snapshots of 140 industrial Java systems. We finally describe three scenarios and an example of the application of our metrics.","third-party libraries; API usage; API stability; software reuse","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:135a94e8-5900-428d-944a-73906e076ccf","http://resolver.tudelft.nl/uuid:135a94e8-5900-428d-944a-73906e076ccf","Qualitative multi-criteria preference representation and reasoning","Visser, W.M.","Jonker, C.M. (promotor)","2012","The research reported on in this thesis is part of a larger research project that aims to develop a negotiation support system called the Pocket Negotiator. This thesis focuses on the question how such a system can represent and reason about a user’s preferences between the possible outcomes of a negotiation. In real-world negotiations, there are many negotiation issues which can have many different values, resulting in a large space of complex outcomes. A negotiation support system needs to have a model of the user’s preferences over this outcome space. Although most current negotiation support systems use numerical measures such as utility to represent preferences, such quantitative preferences are hard to specify for human users, and so it would be more natural to model the user’s preferences in a qualitative way. Moreover, due to the exponential size of the outcome space, it is not feasible to specify a preference ordering directly. Therefore, we aim to represent the preferences in a more compact way by aggregating multiple evaluation criteria that influence preference. The main research objective of this thesis is to develop a framework for the representation of, and reasoning about such qualitative multi-criteria preferences. The thesis makes the following contributions. We propose strategies to derive preferences from incomplete or uncertain information about the objects to be compared. The decisive and safe strategy for incomplete information is based on the notion of least and most preferred completions of objects. The strategies for uncertain information are based on an ordinal representation of the certainty levels of facts. We argue that instead of negotiation issues, the negotiators’ underlying interests should be chosen as criteria, especially if the issues are not preferentially independent. We show that the use of interests as criteria is more flexible than modelling conditional preferences, and provides a better explanation of the derived preferences. We present a general framework for the representation of qualitative, multicriteria preferences, called Qualitative Preference Systems (QPS). The framework defines outcomes as value assignments to a set of variables which can have arbitrary domains, includes a knowledge base that can impose (hard) constraints and define new (abstract) concepts, and defines three types of criteria that can be combined in a tree structure. We show that the QPS framework is expressive, as it can model conditional preferences and underlying interests, goal-based preferences, bipolar preferences, and preferences represented in two other well-known approaches that are representative for a large number of purely qualitative preference modelling approaches. Moreover, we show that the goal-based variant of QPS is just as expressive. For all proposed preference representation frameworks we define corresponding argumentation frameworks that include a logical language, a set of inference rules, and a defeat relation. Some of the argumentation frameworks also provide the possibility to reason with background knowledge to derive information about the values of variables by default. We propose a mechanism to generate explanations for preferences represented in a QPS. We use the intuition that preferences can be explained by the criteria that are deciding in the overall preference. Moreover, we show how a system can use user-provided explanations to update its current preference model. Finally, we introduce a modal logic, called Multi-Attribute Preference Logic (MPL), that provides a language for expressing several strategies to qualitatively derive a preference between objects from property rankings. Three such strategies from the literature on prioritized goals are modelled. The additional value of the logic is that it is possible to reason not only about which objects are preferred according to a certain ordering, but also about the relation between different orderings.","","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Interactive Intelligence","","","",""
"uuid:2d84a076-cb3c-4797-9f2e-11e4ba7044a2","http://resolver.tudelft.nl/uuid:2d84a076-cb3c-4797-9f2e-11e4ba7044a2","Human hand modelling: Kinematics, dynamics, applications","Gustus, A.; Stillfried, G.; Visser, J.; Jörntell, H.; Van der Smagt, P.","","2012","An overview of mathematical modelling of the human hand is given. We consider hand models from a specific background: rather than studying hands for surgical or similar goals, we target at providing a set of tools with which human grasping and manipulation capabilities can be studied, and hand functionality can be described. We do this by investigating the human hand at various levels: (1) at the level of kinematics, focussing on the movement of the bones of the hand, not taking corresponding forces into account; (2) at the musculotendon structure, i.e. by looking at the part of the hand generating the forces and thus inducing the motion; and (3) at the combination of the two, resulting in hand dynamics as well as the underlying neurocontrol. Our purpose is to not only provide the reader with an overview of current human hand modelling approaches but also to fill the gaps with recent results and data, thus allowing for an encompassing picture.","human hand model; hand kinematics; muscle dynamics; tendon dynamics; cadaver studies","en","journal article","Springer-Verlag","","","","","","","","Mechanical, Maritime and Materials Engineering","Department of Biomechanical Engineering","","","",""
"uuid:a79c4534-6681-4a27-aa1a-e76ccb1c2c35","http://resolver.tudelft.nl/uuid:a79c4534-6681-4a27-aa1a-e76ccb1c2c35","Designing awareness systems for social connectedness – A field study approach into theoretical foundations, design principles and evaluation","Visser, T.","Keyson, D.V. (promotor)","2012","Being in touch, and being aware of the people in one’s social network strongly contributes to one’s sense of social well-being. As communication technology has become more ubiquitous, it is possible to always be in touch with friends and relatives in the periphery of one’s attention, e.g. through instant messaging and online social networks. This research investigated the effect of such social information on people’s sense of connectedness. Also, it was studied how such communication application can be integrated into the fabric of our everyday life as awareness systems. It was found that despite the subtlety, mediated social awareness has a measurable effect on social connectedness. Also, the findings strongly suggest that ambiguity in social cues is a strong enabler of the feeling of being connected. These findings may help designers of social network applications and products to more effectively design for increased social connectedness.","social connectedness; social media; interaction design","en","doctoral thesis","Gildeprint","","","","","","","","Industrial Design Engineering","Industrial Design","","","",""
"uuid:66bb3c6b-7480-482a-99d7-9fe235056ca2","http://resolver.tudelft.nl/uuid:66bb3c6b-7480-482a-99d7-9fe235056ca2","A Framework for Qualitative Multi-Criteria Preferences (extended abstract)","Visser, W.; Aydogan, R.; Hindriks, K.V.; Jonker, C.M.","","2012","","","en","conference paper","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Intelligent Systems","","","",""
"uuid:ae7ed0ae-84a5-43b6-aed8-5e1b44a69b67","http://resolver.tudelft.nl/uuid:ae7ed0ae-84a5-43b6-aed8-5e1b44a69b67","The Thyroid Hormone Receptor Alpha Locus and White Matter Lesions: A Role for the Clock Gene REV-ERB?","Medici, M.; Arfan Ikram, M.; Van der Lijn, F.; Den Heijer, T.; Vernooij, M.W.; Hofman, A.; Niessen, W.J.; Visser, T.J.; Breteler, M.M.B.; Peeters, R.P.","","2012","Background: Thyroid disorders are associated with an increased risk of cognitive impairment and Alzheimer's disease. Both small vessel disease and neurodegeneration have a role in the pathogenesis of cognitive impairment and Alzheimer's disease. Thyroid hormone receptor alpha (TR?) is the predominant TR in brain. The circadian clock gene REV-ERB? overlaps with the TR? gene and interferes with TR? expression. Limited data are available on the role of the TR?/REV-ERB? locus in small vessel disease and neurodegeneration. We therefore studied genetic variation in the TR?/REV-ERB? locus in relation to brain imaging data, as early markers for small vessel disease and neurodegeneration. Methods: Fifteen polymorphisms, covering the TR?/REV-ERB? locus, were studied in relation to white matter lesion (WML), total brain, and hippocampal volumes in the Rotterdam Study I (RS-I, n=454). Associations that remained significant after multiple testing correction were subsequently studied in an independent population for replication (RS-II, n=607). Results: No associations with total brain or hippocampal volumes were detected. A haplotype block in REV-ERB? was associated with WML volumes in RS-I. Absence of this haplotype was associated with larger WML volumes in women (0.38%±0.18% [?±SE], p=0.007), but not in men (0.04%±0.11%, p=0.24), which was replicated in RS-II (women: 0.15%±0.05%, p=0.04; men: 0.05%±0.07%, p=0.80). Meta-analysis of the two populations showed that women lacking this haplotype have a 1.9 times larger WML volume (p=0.001). Conclusion: Our results suggest a role for REV-ERB? in the pathogenesis of WMLs.","","en","journal article","Mary Ann Liebert","","","","","","","","Applied Sciences","IST/Imaging Science and Technology","","","",""
"uuid:53b7c9f5-640f-4b81-b7fc-bd1aac198ff0","http://resolver.tudelft.nl/uuid:53b7c9f5-640f-4b81-b7fc-bd1aac198ff0","Correlation singularities in partially coherent electromagnetic beams","Raghunathan, S.B.; Schouten, H.F.; Visser, T.D.","","2012","We demonstrate that coherence vortices, singularities of the correlation function, generally occur in partially coherent electromagnetic beams. In successive cross sections of Gaussian Schell-model beams, their locus is found to be a closed string. These coherence singularities have implications for both interference experiments and correlation of intensity fluctuation measurements performed with such beams.","","en","journal article","Optical Society of America","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:4196299d-c56c-405a-bb69-2dbc4859b5ff","http://resolver.tudelft.nl/uuid:4196299d-c56c-405a-bb69-2dbc4859b5ff","Low-Cost Technology for the Integration of Micro- and Nanochips into Fluidic Systems on Printed Circuit Board: Fabrication Challenges","Palacios-Aguilera, N.B.; Bastemeijer, J.; Mollinger, J.R.; Bossche, A.; Mokkapati, V.R.S.S.; Visser, H.A.; Akkerman, R.","","2012","Nowadays, micro- and nanochips are usually fabricated with Silicon and/or glass. A simple, low-cost and reliable integration packaging method that provides flexibility to the incorporation of electronic and fluidic devices into a system has not been fully developed yet. The use of Printed Circuit Board material as substrate to create dry film resist microfluidic channels is the core technology to provide such an integration method. The feasibility and potential of the proposed packaging method is demonstrated in this work.","dry film resist; printed circuit board; inkjet printing; integration; low-cost","en","journal article","IARIA","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:c710b8c0-b80c-4c26-b35d-b09558faa13b","http://resolver.tudelft.nl/uuid:c710b8c0-b80c-4c26-b35d-b09558faa13b","Plasmon switching: Observation of dynamic surface plasmon steering by selective mode excitation in a sub-wavelength slit","Raghunathan, S.B.; Gan, C.H.; Van Dijk, T.; Ea Kim, B.; Schouten, H.F.; Ubachs, W.; Lalanne, P.; Visser, T.D.","","2012","We report a plasmon steering method that enables us to dynamically control the direction of surface plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface plasmons more efficiently than the fundamental symmetric mode.","","en","journal article","Optical Society of America","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:e6cf0d07-a9f6-418f-9089-843e7a5c7bef","http://resolver.tudelft.nl/uuid:e6cf0d07-a9f6-418f-9089-843e7a5c7bef","Coherence converting plasmonic hole arrays","Gan, C.H.; Gu, Y.; Visser, T.D.; Gbur, G.","","2012","Simulations are presented that demonstrate that the global state of spatial coherence of an optical wavefield can be altered on transmission through an array of subwavelength-sized holes in a metal plate that supports surface plasmons. It is found that the state of coherence of the emergent field strongly depends on the separation between the holes and their scattering strength. Our findings suggest that subwavelength hole arrays on a metal film can be potentially employed as a plasmon-assisted coherence converting device, useful in modifying the directionality, spectrum, and polarization of the transmitted wave","plasmons; coherence; enhanced transmission","en","journal article","Springer-Verlag","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Support EW","","","",""
"uuid:3b472779-6c01-45a4-963b-830c20eac13c","http://resolver.tudelft.nl/uuid:3b472779-6c01-45a4-963b-830c20eac13c","Generalized Gouy phase for focused partially coherent light and its implications for interferometry","Pang, X.; Fischer, D.G.; Visser, T.D.","","2012","The Gouy phase, sometimes called the phase anomaly, is the remarkable effect that in the region of focus a converging wave field undergoes a rapid phase change by an amount of ?, compared to the phase of a plane wave of the same frequency. This phenomenon plays a crucial role in any application where fields are focused, such as optical coherence tomography, mode selection in laser resonators, and interference microscopy. However, when the field is spatially partially coherent, as is often the case, its phase is a random quantity. When such a field is focused, the Gouy phase is therefore undefined. The correlation properties of partially coherent fields are described by their so-called spectral degree of coherence. We demonstrate that this coherence function does exhibit a generalized Gouy phase. Its precise behavior in the focal region depends on the transverse coherence length. We show that this effect influences the fringe spacing in interference experiments in a nontrivial manner.","","en","journal article","Optical Society of America","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:4eebb2d9-e6eb-4b3f-8b08-a51f4c8fce9d","http://resolver.tudelft.nl/uuid:4eebb2d9-e6eb-4b3f-8b08-a51f4c8fce9d","Measuring Library Stability Through Historical Version Analysis","Raemaekers, S.B.A. (TU Delft Software Engineering); van Deursen, A. (TU Delft Software Engineering); Visser, J. (External organisation)","","2012","Backward compatibility is a major concern for any library developer. In this paper, we evaluate how stable a set of frequently used third-party libraries is in terms of method removals, implementation change, the ratio of change in old methods to change in new ones and the percentage of new methods in each snapshot. We provide a motivating example of a commercial company which demonstrates several issues associated with the usage of third-party libraries. To obtain dependencies from software systems we developed a framework which extracts dependencies from Maven build files and which analyzes system and library code. We propose four metrics which provide different insights in the implementation and interface stability of a library. The usage frequency of library methods is utilized as a weight in the final metric and is obtained from a dataset of more than 2300 snapshots of 140 industrial Java systems. We finally describe three scenarios and an example of the application of our metrics.","Conf.proc. > 3 pag","en","conference paper","IEEE","","","","","","","","","","Software Engineering","","",""
"uuid:fb5cd021-4786-48cc-a1d6-d014a61b1df7","http://resolver.tudelft.nl/uuid:fb5cd021-4786-48cc-a1d6-d014a61b1df7","Interest-based preference reasoning","Visser, W.M.; Hindriks, K.V.; Jonker, C.M.","","2011","In the context of practical reasoning, such as decision making and negotiation, it is necessary to model preferences over possible outcomes. Such preferences usually depend on multiple criteria. We argue that the criteria by which outcomes are evaluated should be the satisfaction of a person’s underlying interests: the more an outcome satisfies his interests, the more preferred it is. Underlying interests can explain and eliminate conditional preferences. Also, modelling interests will create a better model of human preferences, and can lead to better, more creative deals in negotiation. We present an argumentation framework for reasoning about interest-based preferences. We take a qualitative approach and provide the means to derive both ceteris paribus and lexicographic preferences.","qualitative preferences, underlying interests, argumentation","en","conference paper","s.n.","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Mediamatics","","","",""
"uuid:b487f575-6568-47be-b288-80a88085fda1","http://resolver.tudelft.nl/uuid:b487f575-6568-47be-b288-80a88085fda1","An argumentation framework for qualitative multi-criteria preferences","Visser, W.M.; Hindriks, K.V.; Jonker, C.M.","","2011","Preferences are derived in part from knowledge. Knowledge, however, may be defeasible. We present an argumentation framework for deriving qualitative, multi-attribute preferences and incorporate defeasible reasoning about knowledge. Intuitively, preferences based on defeasible conclusions are not as strong as preferences based on certain conclusions, since defeasible conclusions may turn out not to hold. This introduces risk when such knowledge is used in practical reasoning. Typically, a risk prone attitude will result in different preferences than a risk averse attitude. In this paper we introduce qualitative strategies for deriving risk sensitive preferences","","en","conference paper","s.n.","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Mediamatics","","","",""
"uuid:3121dc72-8c47-448a-a207-69f9f47f095b","http://resolver.tudelft.nl/uuid:3121dc72-8c47-448a-a207-69f9f47f095b","Quantifying the Encapsulation of Implemented Software Architectures","Bouwers, E.; Van Deursen, A.; Visser, J.","","2011","In the evaluation of implemented software architectures, metrics can be used to provide an indication of the degree of encapsulation within a system and to serve as a basis for an informed discussion about how well-suited the system is for expected changes. Current literature shows that over 40 different architecture-level metrics are available to quantify encapsulation, but empirical validation of these metrics against changes in a system is not available. In this paper we survey existing architecture metrics for their suitability to be used in a late software evaluation context. For 12 metrics that were found suitable we correlate the values of the metric, which are calculated on a single point in time, against the ratio of local change over time using the history of 10 open-source systems. In the design of our experiment we ensure that the value of the existing metrics are representative for the time period which is analyzed. Our study shows that one of the suitable architecture metrics can be considered a valid indicator for the degree of encapsulation of systems. We discuss the implications of these findings both for the research into architecture-level metrics and for software architecture evaluations in industry.","Design; Measurement; Verification; Encapsulation; Architecture Evaluation; Metrics; Experiment","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:75dd33f1-f77b-45fa-860f-9442e1645ece","http://resolver.tudelft.nl/uuid:75dd33f1-f77b-45fa-860f-9442e1645ece","Declaratively Defining Domain-Specific Language Debuggers","Lindeman, R.T.; Kats, L.C.L.; Visser, E.","","2011","Tool support is vital to the effectiveness of domain-specific languages. With language workbenches, domain-specific languages and their tool support can be generated from a combined, high-level specification. This paper shows how such a specification can be extended to describe a debugger for a language. To realize this, we introduce a meta-language for coordinating the debugger that abstracts over the complexity of writing a debugger by hand. We describe the implementation of a language-parametric infrastructure for debuggers that can be instantiated based on this specification. The approach is implemented in the Spoofax language workbench and validated through realistic case studies with the Stratego transformation language and the WebDSL web programming language. This paper is a pre-print of: Ricky T. Lindeman, Lennart C. L. Kats, Eelco Visser. Declaratively Defining Domain-Specific Language Debuggers. In Ewen Denney, Ulrik Pagh Schultz, editors, Generative Programming and Component Engineering, 7th International Conference, GPCE 2011, Portland, OR, USA, October 22-23, 2011, Proceedings. ACM, 2011.","Debugging; Domain-Specific Language; Language Workbench; Spoofax","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:ce5cd5e9-d8de-477f-aa9a-b7b353ee7ff2","http://resolver.tudelft.nl/uuid:ce5cd5e9-d8de-477f-aa9a-b7b353ee7ff2","Experimental investigation on breaching of embankments","Zhu, Y.; Visser, P.J.; Vrijling, J.K.; Wang, G.Q.","","2011","Breaching of embankments has recently drawn more and more attention due to its importance in the development of early warning systems for embankment failures, in the evacuation plans of people at risk, in the design method of embankments based on a risk-approach, etc. The erosion process observed during embankment breaching tests in the laboratory and the analysis of the results are described in this paper. Five embankments, one constructed with pure sand, four with different sand-silt-clay mixtures were tested. The height of the embankments was 75 cm and the width at the crest was 60 cm. Examination of the data from these tests indicated that headcut erosion played an important role in the process of breach growth in the embankments made of cohesive soil mixtures. Flow shear erosion, fluidization of the headcut slope surface, undermining of the headcut due to impinging jet scour and discrete soil mechanical slope mass failure from the headcut were all observed during these tests. For the embankment constructed with pure sand, the breach erosion process was dominated by shear erosion, which led to a gradual and relatively uniform retreat of the downstream slope. The cohesive proportion in the sand-silt-clay mixtures strongly slowed down the erosion process.","embankments; breaching; experiments; headcut; erosion","en","journal article","Science China Press and Springer","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:acce69fb-86c6-403f-a972-0735df7218e9","http://resolver.tudelft.nl/uuid:acce69fb-86c6-403f-a972-0735df7218e9","Hydrodynamic erosion process of undisturbed clay","Zhao, G.; Visser, P.J.; Vrijling, J.K.","","2011","This paper describes the hydrodynamic erosion process of undisturbed clay due to the turbulent flow, based on theoretical analysis and experimental results. The undisturbed clay has the unique and complicated characteristics of cohesive force among clay particles, which are highly different from disturbed clay and non-cohesive sand. Based on momentum equilibrium, the critical incipient velocity is derived from the forces of particle weight under water, cohesive force among particles around the clay particle, uplift force and drag force. Via the turbulent boundary layer flow theory, the critical stress can be connected with these forces. The formulae for the incipient stress and the critical velocity have been calibrated and validated with the results of undisturbed clay tests. A new formula for the erosion rate is proposed. The study gives a new insight into the erosion process of undisturbed clay and the resulting sediment transport","erosion process; undisturbed clay; turbulent boundary-layer flow; incipient stress","en","conference paper","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:e5d125ad-1681-4793-9652-701b3c0ab467","http://resolver.tudelft.nl/uuid:e5d125ad-1681-4793-9652-701b3c0ab467","Declaratively Programming the Mobile Web with Mobl","Hemel, Z.; Visser, E.","","2011","A new generation of mobile touch devices, such as the iPhone, Android and iPad, are equipped with powerful, modern browsers. However, regular websites are not optimized for the specific features and constraints of these devices, such as limited screen estate, unreliable Internet access, touch-based interaction patterns, and features such as GPS. While recent advances in web technology enable web developers to build web applications that take advantage of the unique properties of mobile devices, developing such applications is not a clean, well-integrated experience. Developers are required to use many loosely coupled languages with limited tool support and application code is often verbose and imperative. We introduce mobl, a new language designed to declaratively construct mobile web applications. Mobl integrates languages for user interface design, data modeling and querying, scripting and web services into a single, unified language that is flexible, expressive, enables early detection of errors, and has good IDE support. We illustrate the design of the language with the implementation of ConfPlan, an application for keeping track of the schedule of conference events.","mobile web; web development; reactive programming; declarative programming","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:9e322f56-f4a4-4baf-b2c3-7b7bf6287f17","http://resolver.tudelft.nl/uuid:9e322f56-f4a4-4baf-b2c3-7b7bf6287f17","Landscape Architecture at TU Delft 1973-2011: Ter gelegenheid afscheid Prof. Dr. Clemens Steenbergen","Homan, A.; Van der Weide, A.; Bordes, B.; Kwast, B.; Van den Heuvel, D.; Stegewerns, C.; Jongsma, C.; Van Ees, C.; Wouters, C.; Jauslin, D.; Wijnen, D.; Piccinini, D.; Dekker, E.; Van der Kooij, E.; Luiten, E.; De Jong, E.; Toni, F.; Aerts, F.; Verschuure-Stuip, G.; Stotijn, H.; Bakker, I.; Bobbink, I.; Meulenberg, I.; Woltjer, J.; Wilbers, J.; Niemeijer, J.; Lonsdale, J.; Wiers, J.; Pouderoijen, M.; Roos, A.; Hellendoorn, D.; Visser, K.; Storm-Prins, M.; Van der Helm, M.; De Vos, L.; Veldman, M.; Hartveld, M.; Den Ruijter, M.; Verbruggen, N.; Rickert, N.; De Graaf, P.; Van der Ree, P.; Aben, R.; Buijs, R.; Rooij, R.; Van der Velde, R.; De Wit, S.; Nijhuis, S.; Holtappels, S.; Meeks, S.; Van Assen, S.; Van Oosten, S.; Van den Busken, S.; Hermans, W.","","2011","Het is haast onmogelijk om de werkzame jaren van Prof. Dr. Clemens Steenbergen hier op de TU Delft in het kort samen te vatten. Dit is een persoonlijk boek van collega's, medewerkers en studenten ter gelegenheid van zijn afscheid op 15. December 2011.","","nl","book","TU Delft Landscape Architecture","","","","","","","2012-02-09","Architecture","Urbanism","","","",""
"uuid:1ff1791d-02d7-4d31-8aa8-a93a282f8e14","http://resolver.tudelft.nl/uuid:1ff1791d-02d7-4d31-8aa8-a93a282f8e14","Zeetoegang IJmuiden, T0 onderzoek R-110 Analyserapport Civiele bouw Noordersluis R-120 Analyserapport Staalbouw R-130 Analyserapport Werktuigbouw R-140 Analyserapport BBE&V R-150 Analyserapport Waterbouw R-160 Inspectierapport Noordersluis R-170 Integrale RAMS Analyse","Göttgens, E.J.E.; Van der Waal, R.J.; Visser, L.J.; Roos, I.; Benayad, K.; Van Slobbe, B.T.M.; Nooij, R.; Groenendijk, A.H.; Persoon, E.","Rijkswaterstaat","2011","Onderzoek naar de huidige toestand van de Noordersluis.","IJmuiden; zeesluis","nl","report","Rijkswaterstaat, Directie Noord-Holland","","","","","","","2015-12-31","","","","","Sluis IJmuiden",""
"uuid:08b33a19-76ab-4f82-af39-79da42071b67","http://resolver.tudelft.nl/uuid:08b33a19-76ab-4f82-af39-79da42071b67","Argumentation-based qualitative preference modelling with incomplete and uncertain information","Visser, W.; Hindriks, K.V.; Jonker, C.M.","","2011","This paper presents an argumentation-based framework for the modelling of, and automated reasoning about multi-attribute preferences of a qualitative nature. The framework presents preferences according to the lexicographic ordering that is well-understood by humans. Preferences are derived in part from knowledge. Knowledge, however, may be incomplete or uncertain. The main contribution of the paper is that it shows how to reason about preferences when only incomplete or uncertain information is available. We propose a strategy that allows reasoning with incomplete information and discuss a number of strategies to handle uncertain information. It is shown how to extend the basic framework for modelling preferences to incorporate these strategies.","qualitative multi-attribute preferences; argumentation; incomplete information; uncertain information","en","journal article","Springer","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Intelligent Systems","","","",""
"uuid:e42638c8-6a2a-4929-917b-20529f6fbd9f","http://resolver.tudelft.nl/uuid:e42638c8-6a2a-4929-917b-20529f6fbd9f","Integrated Language Definition Testing: Enabling Test-Driven Language Development","Kats, L.C.L.; Vermaas, R.; Visser, E.","","2011","The reliability of compilers, interpreters, and development environments for programming languages is essential for effective software development and maintenance. They are often tested only as an afterthought. Languages with a smaller scope, such as domain-specific languages, often remain untested. General-purpose testing techniques and test case generation methods fall short in providing a low-threshold solution for test-driven language development. In this paper we introduce the notion of a language-parametric testing language (LPTL) that provides a reusable, generic basis for declaratively specifying language definition tests. We integrate the syntax, semantics, and editor services of a language under test into the LPTL for writing test inputs. This paper describes the design of an LPTL and the tool support provided for it, shows use cases using examples, and describes our implementation in the form of the Spoofax testing language. This paper is a pre-print of: Lennart C. L. Kats, Rob Vermaas, Eelco Visser. Integrated Language Definition Testing. Enabling Test-Driven Language Development. In Kathleen Fisher, editor, Proceedings of the 26th Annual ACM SIGPLAN Conference on Object-Oriented Programming, Systems, Languages, and Applications (OOPSLA 2011), ACM, 2010.","Testing; Test-Driven Development; Language Engineering; Grammarware; Language Workbench; Domain-Specific Language; Language Embedding; Compilers; Parsers","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:b5b0430e-928e-444f-9501-f699e7953dbe","http://resolver.tudelft.nl/uuid:b5b0430e-928e-444f-9501-f699e7953dbe","Dependency Profiles for Software Architecture Evaluations","Bouwers, E.; Van Deursen, A.; Visser, J.","","2011","In this paper we introduce the concept of a -dependency profile-, a system level metric aimed at quantifying the level of encapsulation and independence within a system. We verify that these profiles are suitable to be used in an evaluation context by inspecting the dependency profiles for a repository of almost 100 systems. Furthermore we outline the steps we are taking to validate the usefulness and applicability of the proposed profiles. Accepted for publication in the Proceedings of the 27th IEEE International Conference on Software Maintenance (ICSM), 2011, IEEE Computer Society.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:6218bcec-86ae-4f00-bc6a-17f5d0459c58","http://resolver.tudelft.nl/uuid:6218bcec-86ae-4f00-bc6a-17f5d0459c58","Efficient use of the Noise Budget at Schiphol Airport through Minimax Optimization of Runway Allocations","Kuiper, B.R.; Visser, H.G.; Heblij, S.","","2011","This paper presents the development of a runway allocation planning tool that seeks to maximize the permissible number of flight operations into and out of an airport within a given annual noise budget. Although the model that underlies the planning tool is generic in nature, the tool has been customized for application to a specific airport, viz. Amsterdam airport Schiphol in the Netherlands. The noise budget regulations applicable at Schiphol stipulate limits on the annual cumulative noise loads at a large number of enforcement points arranged around the airport. To ensure an equitable distribution of the cumulative noise load at the enforcement points, an efficient allocation and distribution of the annual flight movements over available runways and routes is required that takes weather induced restrictions into account. To this end, a Linear Programming (LP) optimization formulation has been developed that implements a minimax performance criterion that aims to minimize the maximum cumulative noise load value occurring at any of the enforcement points. The numerical results obtained for the operational year 2005 clearly demonstrate the potential of the tool to maximize the yearly number of flight movements within the assigned noise budget.","","en","conference paper","American Institute of Aeronautics and Astronautics (AIAA)","","","","","","","","Aerospace Engineering","Control & Operations","","","",""
"uuid:60864d18-d54a-4803-b1fd-492db07a5743","http://resolver.tudelft.nl/uuid:60864d18-d54a-4803-b1fd-492db07a5743","Development of a Multi-Event Trajectory Optimization Tool for Noise-Optimized Approach Route Design","Braakenburg, M.L.; Hartjes, S.; Visser, H.G.; Hebly, S.J.","","2011","This paper presents preliminary results from an ongoing research effort towards the development of a multi-event trajectory optimization methodology that allows to synthesize RNAV approach routes that minimize a cumulative measure of noise, taking into account the total noise effect aggregated for all inbound flight movements taking place within an operational year. This new development is an extension of a tool called NOISHHH which was developed earlier for the synthesis of single-event noise abatement RNAV trajectories into and out of airports. Although the presented numerical examples pertain to a specific airport in the Netherlands, viz. Rotterdam the Hague airport, this study focuses on the development of a generic methodology that can be applied to any given airport. Initial application of the adapted optimization framework to the design of noise abatement RNAV approach routes at Rotterdam The Hague airport reveals a significant potential for reducing the number of people highly annoyed due to annual noise exposure relative to the existing situation.","","en","conference paper","American Institute of Aeronautics and Astronautics (AIAA)","","","","","","","","Aerospace Engineering","Control & Operations","","","",""
"uuid:2e28874f-9c12-45f3-b64b-402238caeec2","http://resolver.tudelft.nl/uuid:2e28874f-9c12-45f3-b64b-402238caeec2","Size-dependent magnetic ordering and spin dynamics in DyPO4 and GdPO4 nanoparticles","Evangelisti, M.; Sorop, T.G.; Bakharev, O.N.; Visser, D.; Hillier, A.D.; Alonso, J.J.; Haase, M.; Boatner, L.A.; De Jongh, L.J.","","2011","Low-temperature magnetic susceptibility and heat-capacity measurements on nanoparticles (d? 2.6 nm) of the antiferromagnetic compounds DyPO4 (TN=3.4 K) and GdPO4 (TN=0.77 K) provide clear demonstrations of finite-size effects, which limit the divergence of the magnetic correlation lengths, thereby suppressing the bulk long-range magnetic ordering transitions. Instead, the incomplete antiferromagnetic order inside the particles leads to the formation of net magnetic moments on the particles. For the nanoparticles of Ising-type DyPO4 superparamagnetic blocking is found in the ac susceptibility at ?1 K, those of the XY-type GdPO4 analog show a dipolar spin-glass transition at ?0.2 K. Monte Carlo simulations for the magnetic heat capacities of both bulk and nanoparticle samples are in agreement with the experimental data. Strong size effects are also apparent in the Dy3+ and Gd3+ spin dynamics, which were studied by zero-field muon spin rotation (?SR) and high-field 31P-nuclear magnetic resonance (31P-NMR) nuclear relaxation measurements. The freezing transitions observed in the ac susceptibility of the nanoparticles also appear as peaks in the temperature dependence of the zero-field ?SR rates, but at slightly higher temperatures, as to be expected from the higher frequency of the muon probe. For both bulk and nanoparticles of GdPO4, the muon and 31P-NMR rates are for T?5 K dominated by exchange-narrowed hyperfine broadening arising from the electron spin-spin interactions inside the particles. The dipolar hyperfine interactions acting on the muons and the 31P are, however, much reduced in the nanoparticles. For the DyPO4 analogs the high-temperature rates appear to be fully determined by electron spin-lattice relaxation processes.","","en","journal article","American Physical Society","","","","","","","","Applied Sciences","RRR/Radiation, Radionuclides and Reactors","","","",""
"uuid:3ddf7e58-b499-4e03-ad57-7eddcd3f0728","http://resolver.tudelft.nl/uuid:3ddf7e58-b499-4e03-ad57-7eddcd3f0728","Closing the gap between simulation and reality in the sensor and motion models of an autonomous AR.Drone","Visser, A.; Dijkshoorn, N.; Van der Veen, M.; Jurriaans, R.","","2011","This article describes a method to develop an advanced navigation capability for the standard platform of the IMAV indoor competition: the Parrot AR.Drone. Our development is partlybased on simulation, which requires both a re-alistic sensor and motion model. This article de-scribes how a visual map of the indoor environ-ment can be made, including the effect of sensor noise. In addition, validation results for the mo-tion model are presented. On this basis, it shouldbe possible to learn elevation maps, optimal paths on this visual map and to autonomously avoid obstacles based on optical ?ow.","Micro Air Vehicle; autonomous flight; visual SLAM","en","conference paper","","","","","","","","","","","","","",""
"uuid:1f89d741-c97a-46dc-86ca-b396d8446c69","http://resolver.tudelft.nl/uuid:1f89d741-c97a-46dc-86ca-b396d8446c69","Klant Eisen Specificatie: Zeetoegang IJmond","Visser, M.; Vreman, C.","Rijkswaterstaat","2011","Binnen Rijkswaterstaat is het opstellen van de Klant Eisen Specificatie onderdeel van het vaststellen van de klantvraag. Dit is de tweede stap uit het Stappenplan Systems Engineering voor RWS projecten. In de Klant Eisen Specificatie staan kaderstellende onderdelen, zoals de probleem- en doelstelling en beschrijving van het System of Interest, ter contextuele ondersteuning van het vaststellen van de klantvraag. De Klant Eisen Specificatie bestaat uit een stakeholdertabel en de eisen van de verschillende stakeholders; ook wel klanteisen genoemd.","IJmuiden; programma van eisen","nl","report","Rijkswaterstaat, Directie Noord-Holland","","","","","","","","","","","","Sluis IJmuiden",""
"uuid:77aaf94f-0aba-4848-b15a-a1404cd66cde","http://resolver.tudelft.nl/uuid:77aaf94f-0aba-4848-b15a-a1404cd66cde","Design of an Airborne Three-Dimensional Separation Assistance Display","Ellerbroek, J.; Visser, M.; Van Dam, S.B.J.; Van Paassen, M.M.; Mulder, M.","","2011","In the context of the Next Generation Air Transportation System and Single European Sky ATM Research future airspace programs, this paper describes a concept for an airborne separation assurance display that is designed to aid pilots in their task of self-separation, by visualizing the possibilities for conflict resolution that the airspace provides. This paper is part of an ongoing research toward an ecological design of a separation assistance interface that can present all the relevant properties of the spatiotemporal separation problem. A work-domain analysis is described from which several perspective projections of traffic properties and travel constraints are derived. A display concept is proposed that presents heading and altitude action possibilities in a flight-path angle-track angle action space. Key issues in the current design are discussed, with recommendations for future work.","Ecological Interface Design (EID); Airborne Separation Assistance System (ASAS); self-separation; situation awareness","en","journal article","IEEE","","","","","","","","Aerospace Engineering","Control and Operations","","","",""
"uuid:5b31212b-9c2b-4b7e-82e1-3b7aad663b0a","http://resolver.tudelft.nl/uuid:5b31212b-9c2b-4b7e-82e1-3b7aad663b0a","An argumentation framework for deriving qualitative risk sensitive preferences","Visser, W.M.; Hindriks, K.V.; Jonker, C.M.","","2011","Preferences are derived in part from knowledge. Knowledge, however, may be defeasible. We present an argumentation framework for deriving qualitative, multi-attribute preferences and incorporate defeasible reasoning about knowledge. Intuitively, preferences based on defeasible conclusions are not as strong as preferences based on certain conclusions, since defeasible conclusions may turn out not to hold. This introduces risk when such knowledge is used in practical reasoning. Typically, a risk prone attitude will result in different preferences than a risk averse attitude. In this paper we introduce qualitative strategies for deriving risk sensitive preferences","","en","conference paper","IEA","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Man-Machine Interaction","","","",""
"uuid:9d50d365-92da-497f-9471-70a111d6318e","http://resolver.tudelft.nl/uuid:9d50d365-92da-497f-9471-70a111d6318e","SWOT analysis of breach models for common dike failure mechanisms","Peeters, P.; Van Hoestenberghe, T.; Vincke, L.; Visser, P.J.","","2011","The use of breach models includes two tasks: predicting breach characteristics and estimating flow through the breach. Strengths and weaknesses as well as opportunities and threats of different simplified and detailed physically-based breach models are listed following theoretical and practical criteria. According to the theoretical criteria, the breach models that incorporate detailed breaching processes offer more opportunities. In practice however, these models do not necessarily give rise to better results. From the SWOT-analysis, it can be concluded that consolidation of present knowledge towards a comprehensive breaching theory is far from complete. For flood risk analyses, the challenge remains to find equilibrium between detailed process description and practical model implementation and calibration. Nowadays, some modelling suites are black-box models. Others have numerous modelling options that do not improve transparency. Moreover, all models lack validation for real-world case studies, especially for composite dike types","breach models, dike type, failure mechanism, non-cohesive and cohesive core material","en","conference paper","Engineers Australia","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:f8efc3b3-cf71-451a-8bf3-851a5bbb819b","http://resolver.tudelft.nl/uuid:f8efc3b3-cf71-451a-8bf3-851a5bbb819b","The Gouy phase of Airy beams","Pang, X.; Gbur, G.; Visser, T.D.","","2011","The phase behavior of Airy beams is studied, and their Gouy phase is defined. Analytic expressions for the idealized, infinite-energy type beam are derived. They are shown to be excellent approximations for finite-energy beams generated under typical experimental conditions.","diffraction theory; phase","en","journal article","Optical Society of America","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:eb7f4300-ad93-468f-a2bf-6c7d3f6bcf3d","http://resolver.tudelft.nl/uuid:eb7f4300-ad93-468f-a2bf-6c7d3f6bcf3d","Quantifying the Analyzability of Software Architectures","Bouwers, E.M.; Correia, J.P.; Van Deursen, A.; Visser, J.","","2011","The decomposition of a software system into components is a major decision in any software architecture, having a strong influence on many of its quality aspects. A system’s analyzability, in particular, is influenced by its decomposition into components. But into how many components should a system be decomposed to achieve optimal analyzability? And how should the elements of the system be distributed over those components? In this paper, we set out to find answers to these questions with the support of a large repository of industrial and open source software systems. Based on our findings, we designed a metric which we call Component Balance. In a case study we show that the metric provides pertinent results in various evaluation scenarios. In addition, we report on an empirical study that demonstrates that the metric is strongly correlated with ratings for analyzability as given by experts. Accepted for publication in the Proceedings of the NinthWorking Conference on Software Architecture (WICSA), 2011, IEEE Computer Society, 20-24 June 2011 Boulder, USA","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:60c233e2-a279-4099-967f-a9ac2a80aabe","http://resolver.tudelft.nl/uuid:60c233e2-a279-4099-967f-a9ac2a80aabe","Argument schemes for two-phase democratic deliberation","Bench-Capon, T.; Prakken, H.; Visser, W.","","2011","A formal two-phase model of democratic policy deliberation is presented, in which in the first phase sufficient and necessary criteria for proposals to be accepted are determined (the ‘acceptable’ criteria) and in the second phase proposals are made and evaluated in light of the acceptable criteria resulting from the first phase. Such a separation gives the discussion a clear structure and prevents time and resources from being wasted on evaluating arguments for proposals based on unacceptable criteria. Argument schemes for both phases are defined and formalised in a logical framework for structured argumentation. The process of deliberation is abstracted from and it is assumed that both deliberation phases result in a set of arguments and attack and defeat relations between them. The acceptability status of criteria and proposals within the resulting argumentation framework is then evaluated using preferred semantics. For cases where preferences are required to choose between proposals, inference rules for deriving preferences between sets from an ordering of their elements are given.","","en","conference paper","IAAIL","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Mediamatics","","","",""
"uuid:783d9e8a-8aff-4616-9be0-65b6b8442fa7","http://resolver.tudelft.nl/uuid:783d9e8a-8aff-4616-9be0-65b6b8442fa7","Validation of GOCE gravity field models by means of orbit residuals and geoid comparisons","Gruber, T.; Visser, P.N.A.M.; Ackermann, C.; Hosse, M.","","2011","Three GOCE-based gravity field solutions have been computed by ESA’s high-level processing facility and were released to the user community. All models are accompanied by variance-covariance information resulting either from the least squares procedure or a Monte-Carlo approach. In order to obtain independent external quality parameters and to assess the current performance of these models, a set of independent tests based on satellite orbit determination and geoid comparisons is applied. Both test methods can be regarded as complementary because they either investigate the performance in the long wavelength spectral domain (orbit determination) or in the spatial domain (geoid comparisons). The test procedure was applied to the three GOCE gravity field solutions and to a number of selected pre-launch models for comparison. Orbit determination results suggest, that a pure GOCE gravity field model does not outperform the multi-year GRACE gravity field solutions. This was expected as GOCE is designed to improve the determination of the medium to high frequencies of the Earth gravity field (in the range of degree and order 50 to 200). Nevertheless, in case of an optimal combination of GOCE and GRACE data, orbit determination results should not deteriorate. So this validation procedure can also be used for testing the optimality of the approach adopted for producing combined GOCE and GRACE models. Results from geoid comparisons indicate that with the 2 months of GOCE data a significant improvement in the determination of the spherical harmonic spectrum of the global gravity field between degree 50 and 200 can be reached. Even though the ultimate mission goal has not yet been reached, especially due to the limited time span of used GOCE data (only 2 months), it was found that existing satellite-only gravity field models, which are based on 7 years of GRACE data, can already be enhanced in terms of spatial resolution. It is expected that with the accumulation of more GOCE data the gravity field model resolution and quality can be further enhanced, and the GOCE mission goal of 1–2 cm geoid accuracy with 100 km spatial resolution can be achieved.","GOCE; gravity field; validation; orbit; geoid","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:25d82978-fe76-4a94-a15e-3c4336147aa3","http://resolver.tudelft.nl/uuid:25d82978-fe76-4a94-a15e-3c4336147aa3","Aircraft Noise Simulation for a Virtual Reality Environment","Arntzen, M.; Van Veen, T.A.; Visser, H.G.; Simons, D.G.","","2011","Aircraft noise annoyance predictions based on traditional tools lack fidelity when modelling a single aircraft flyover. For evaluating annoyance of new procedures, different aircraft types or changing atmospheric conditions, a new modelling approach is necessary. A research effort has been initiated to develop a toolchain that links each of the relevant components. This allows the use of synthesized sound in a virtual reality simulator and enhances follow-up annoyance investigations. The toolchain components and current capabilities are presented in this paper. Audible results are illustrated by spectrograms to show the difference between different atmospheric conditions. Through the development of the toolchain, it becomes possible to demonstrate audible results of changing aircraft procedures, type and atmosphere in a virtual reality environment. This opens new ways to investigate how people value aircraft noise in different atmospheres in combination with smart planning of aircraft procedures.","","en","conference paper","American Institute of Aeronautics and Astronautics (AIAA)","","","","","","","","Aerospace Engineering","Control & Operations","","","",""
"uuid:5f11d8f1-94d5-4229-a05c-4963306f3854","http://resolver.tudelft.nl/uuid:5f11d8f1-94d5-4229-a05c-4963306f3854","GPS-derived orbits for the GOCE satellite","Bock, H.; Jäggi, A.; Meyer, U.; Visser, P.N.A.M.; Van den IJssel, J.A.A.; Van Helleputte, T.; Heinze, M.; Hugentobler, U.","","2011","The first ESA (European Space Agency) Earth explorer core mission GOCE (Gravity field and steady-state Ocean Circulation Explorer) was launched on 17 March 2009 into a sun-synchronous dusk–dawn orbit with an exceptionally low initial altitude of about 280 km. The onboard 12-channel dual-frequency GPS (Global Positioning System) receiver delivers 1 Hz data, which provides the basis for precise orbit determination (POD) for such a very low orbiting satellite. As part of the European GOCE Gravity Consortium the Astronomical Institute of the University of Bern and the Department of Earth Observation and Space Systems are responsible for the orbit determination of the GOCE satellite within the GOCE High-level Processing Facility. Both quick-look (rapid) and very precise orbit solutions are produced with typical latencies of 1 day and 2 weeks, respectively. This article summarizes the special characteristics of the GOCE GPS data, presents POD results for about 2 months of data, and shows that both latency and accuracy requirements are met. Satellite Laser Ranging validation shows that an accuracy of 4 and 7 cm is achieved for the reduced-dynamic and kinematic Rapid Science Orbit solutions, respectively. The validation of the reduced-dynamic and kinematic Precise Science Orbit solutions is at a level of about 2 cm.","GOCE; GPS; precise orbit determination; SLR validation","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:e4b319c4-dade-4883-80fb-f04da6b25a02","http://resolver.tudelft.nl/uuid:e4b319c4-dade-4883-80fb-f04da6b25a02","Faster issue resolution with higher technical quality of software","Bijlsma, D.; Ferreira, M.A.; Luijten, B.; Visser, J.","","2011","We performed an empirical study of the relation between technical quality of software products and the issue resolution performance of their maintainers. In particular, we tested the hypothesis that ratings for source code maintainability, as employed by the Software Improvement Group (SIG) quality model, are correlated with ratings for issue resolution speed. We tested the hypothesis for issues of type defect and of type enhancement. This study revealed that all but one of the metrics of the SIG quality model show a significant positive correlation with the resolution speed of defects, enhancements, or both.","software defects; defect resolution; maintainability; source code metrics; rank correlation; issue tracker mining","en","journal article","Springer","","","","","","","","Delft University of Technology","","","","",""
"uuid:126ced2c-0466-46b5-b4a0-ac3f17ccbe1b","http://resolver.tudelft.nl/uuid:126ced2c-0466-46b5-b4a0-ac3f17ccbe1b","Modelling and observing the 8.8 Chile and 9.0 Japan earthquakes using GOCE","Broerse, D.B.T.; Visser, P.N.A.M.; Bouman, J.; Fuchs, M.; Vermeersen, L.L.A.; Schmidt, M.","","2011","Large earthquakes do not only heavily deform the crust in the vicinity of the fault, they also change the gravity field of the area affected by the earthquake due to mass redistribution in the upper layers of the Earth. Besides that, for sub-oceanic earthquakes deformation of the ocean floor causes relative sea-level changes and mass redistribution of water that has again a significant effect on the gravity field. Such a sub-oceanic earthquake occurred on 27 February 2010 in central Chili with a magnitude of Mw 8.8 and on 11 March 2011 with a magnitude of Mw 9.0 near the east coast of Honshu, Japan. This makes both a potential candidate for detecting the co-seismic gravity changes in the GOCE gradiometer data. We will assess the detectability of gravity field changes in the GOCE gravity gradients by modelling these earthquakes using a forward model as well as taking differences of of GOCE data before and after the respective earthquakes.","GOCE; co-seismic deformation; Maule 8.8 earthquake; Tohoku 9.0 earthquake; time variable gravity","en","conference paper","European Space Agency (ESA)","","","","","","","","Aerospace Engineering","Astrodynamics & Satellite Systems","","","",""
"uuid:68108b2e-f488-4695-88ae-2d521c31d490","http://resolver.tudelft.nl/uuid:68108b2e-f488-4695-88ae-2d521c31d490","Evaluating GOCE data near a mid-ocean ridge and possible application to crustal structure in Scandinavia","Van der Wal, W.; Wang, L.; Visser, P.N.A.M.; Sneeuw, N.; Vermeersen, L.L.A.","","2011","GOCE gravity fields are assessed in an area around Reykjanes Ridge. Ship gravity measurements were found to be to inaccurate to determine possible improvement of GOCE gravity field models compared to the best available GRACE gravity field model. Differences between the GOCE gravity field models and EGM2008 does not appear to contain a component of the mid-ocean ridge signal. However the differences follow the Greenland coastline, which could indicate small errors in EGM 2008 there as a result of piecing together different gravity field observations. A Butterworth bandpass filter was applied to gradiometer observations at orbit height. After filtering, differences between repeat tracks with a magnitude of tens of mE are present, which can not be explained by position or attitude of the satellite. In order to reach the repeatability that can be expected from GOCE measurements, filtering methods need to improve. It was found that differences between global GRACE and GOCE gravity field models are small compared to uncertainty in crustal and upper mantle structure. Thus, geophysical inversion studies should focus on the gravity gradient observations in the instrument reference frame and at orbit height.","","en","conference paper","European Space Agency (ESA)","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:41b0ab7d-1950-48e2-b2c1-baafd15ec30e","http://resolver.tudelft.nl/uuid:41b0ab7d-1950-48e2-b2c1-baafd15ec30e","GOCE SSTI L2 tracking losses and their impact on POD performance","Van den IJssel, J.A.A.; Visser, P.N.A.M.; Doornbos, E.N.; Meyer, U.; Bock, H.; Jäggi, A.","","2011","The state-of-the-art GOCE Satellite-to-Satellite Tracking Instrument (SSTI) delivers high-quality GPS data with an almost continuous 1 Hz data rate, which allows for very Precise Orbit Determination (POD). Despite this good performance, the GPS receiver shows occasional unexpected L2 tracking losses, which mainly occur close to the geomagnetic poles and, to a lesser extent, also along the geomagnetic equator. The number of unexpected L2 tracking losses varies in time and shows some correlation with solar activity. Less than 3% of the observation data is affected by these losses. Therefore, the effect on the POD remains limited. However, systematic effects might be present, as the quality of the GOCE orbits is slightly reduced over the polar regions. The striking correlation between the global distribution of ionospheric irregularities and L2 losses suggests scintillation effects might be present. Analysis of the time derivative of the geometry-free combination of GPS phase observations shows that unexpected L2 losses occur during times of rapid ionospheric fluctuations. GPS satellites in cross-track direction are most affected by L2 losses.","GOCE; GPS; tracking losses; ionosphere; scintillations","en","conference paper","European Space Agency (ESA)","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:96cd39c8-1c5b-4e44-9ee0-13358795f40d","http://resolver.tudelft.nl/uuid:96cd39c8-1c5b-4e44-9ee0-13358795f40d","GOCE level 2 gravity gradients","Bouman, J.; Fiorot, S.; Fuchs, M.; Gruber, T.; Schrama, E.J.O.; Tscherning, C.C.; Veicherts, M.; Visser, P.N.A.M.","","2011","Two of the GOCE Level 2 products are the gravity gradients (GGs) in the Gradiometer Reference Frame (GRF) and the GGs in the Local North-Oriented Frame (LNOF). The GRF is an instrument frame and the GGs are derived from the L1b GGs. The L1b to L2 GG processing involves corrections for temporal gravity variations, outlier detection and data gap interpolation, as well as the external calibration of the GGs using independent gravity field information. Because of the gradiometer configuration, four out of the six GGs - VXX, VYY, VZZ and VXZ - will have a small error in the Measurement Band (MB), whereas the other two - VXY and VYZ - will have low accuracy. The GRF GGs are rotated to the LNOF that is directly related to the Earth.","","en","conference paper","European Space Agency (ESA)","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:f24a9cd1-97f4-4178-bfad-5d4ada4a64be","http://resolver.tudelft.nl/uuid:f24a9cd1-97f4-4178-bfad-5d4ada4a64be","GOCE gravitational gradients along the orbit","Bouman, J.; Fiorot, S.; Fuchs, M.; Gruber, T.; Schrama, E.J.O.; Tscherning, C.; Veicherts, M.; Visser, P.N.A.M.","","2011","GOCE is ESA’s gravity field mission and the first satellite ever that measures gravitational gradients in space, that is, the second spatial derivatives of the Earth’s gravitational potential. The goal is to determine the Earth’s mean gravitational field with unprecedented accuracy at spatial resolutions down to 100 km. GOCE carries a gravity gradiometer that allows deriving the gravitational gradients with very high precision to achieve this goal. There are two types of GOCE Level 2 gravitational gradients (GGs) along the orbit: the gravitational gradients in the gradiometer reference frame (GRF) and the gravitational gradients in the local north oriented frame (LNOF) derived from the GGs in the GRF by point-wise rotation. Because the V XX , V YY , V ZZ and V XZ are much more accurate than V XY and V YZ , and because the error of the accurate GGs increases for low frequencies, the rotation requires that part of the measured GG signal is replaced by model signal. However, the actual quality of the gradients in GRF and LNOF needs to be assessed. We analysed the outliers in the GGs, validated the GGs in the GRF using independent gravity field information and compared their assessed error with the requirements. In addition, we compared the GGs in the LNOF with state-of-the-art global gravity field models and determined the model contribution to the rotated GGs. We found that the percentage of detected outliers is below 0.1% for all GGs, and external gravity data confirm that the GG scale factors do not differ from one down to the 10?3 level. Furthermore, we found that the error of V XX and V YY is approximately at the level of the requirement on the gravitational gradient trace, whereas the V ZZ error is a factor of 2–3 above the requirement for higher frequencies. We show that the model contribution in the rotated GGs is 2–35% dependent on the gravitational gradient. Finally, we found that GOCE gravitational gradients and gradients derived from EIGEN-5C and EGM2008 are consistent over the oceans, but that over the continents the consistency may be less, especially in areas with poor terrestrial gravity data. All in all, our analyses show that the quality of the GOCE gravitational gradients is good and that with this type of data valuable new gravity field information is obtained.","GOCE; gravitational gradients; external calibration; tensor rotation","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:21fb76c9-930e-473a-a906-013537d5a5c0","http://resolver.tudelft.nl/uuid:21fb76c9-930e-473a-a906-013537d5a5c0","River Engineering","de Vriend, H.J.; Havinga, H.; van Prooijen, B.C.; Visser, P.J.; Wang, Z.B.","","2011","In this syllabus an overview is given of the basic knowledge, which is required to prepare interventions in rivers and to estimate the consequences of these interventions. The utilization of the river for human purposes and the knowledge of hydraulics, sediment transport and morphology will be treated. At the end of this syllabus some practice examples are discussed, of which a few are focused on the Dutch section of the Rhine River.","","en","lecture notes","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:43406474-0a55-496a-82bc-79cad9139d8a","http://resolver.tudelft.nl/uuid:43406474-0a55-496a-82bc-79cad9139d8a","Rivierwaterbouwkunde","de Vriend, H.J.; Havinga, H.; van Prooijen, B.C.; Visser, P.J.; Wang, Z.B.","","2011","Deze syllabus beoogt een overzicht te geven van de basiskennis die nodig is om ingrepen in de rivier voor te bereiden en de gevolgen ervan te kunnen inschatten. Er wordt ingegaan op het gebruik dat de mens maakt van de rivier en op de kennis van de hydraulica, het sedimenttransport en de morfologie. Aan het einde van het dictaat worden praktijkvoorbeelden behandeld, waarvan een aantal is geënt op het Nederlandse deel van de Rijn.","","nl","lecture notes","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:ab778de2-9f1b-4f2d-b73b-d7fbcae269d3","http://resolver.tudelft.nl/uuid:ab778de2-9f1b-4f2d-b73b-d7fbcae269d3","A cognitive model for software architecture complexity","Bouwers, E.; Lilienthal, C.; Visser, J.; Van Deursen, A.","","2010","Evaluating the complexity of the architecture of a softwaresystem is a difficult task. Many aspects have to be considered to come to a balanced assessment. Several architecture evaluation methods have been proposed, but very few define a quality model to be used during the evaluation process. In addition, those methods that do introduce a quality model do not neccesarilly explain why elements of the model influence the complexity of an architecture. In this paper we propose a Software Architecture Complexity Model (SACM) which can be used to reason about the complexity of a software architecture. This model is based on theories from cognitive science and system attributes that have proven to be indicators of maintainability in practice. SACM can be used as a formal model to explain existing quality models, and as a starting point within architecture evaluation methods such as ATAM. Alternatively, it can be used in a stand-alone fashion to reason about a software architecture’s complexity Preprint accepted for publication in the Proceedings of the International Conference on Program Comprehension (ICPC), Braga (Portugal), June 30-July 2, 2010, IEEE Computer Society.","Software Architecture Evaluation; Software Architecture; Complexity; Cognitive models","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:fd5e97b8-963d-4284-b7b0-6017d4b6b13b","http://resolver.tudelft.nl/uuid:fd5e97b8-963d-4284-b7b0-6017d4b6b13b","Interactive disambiguation of meta programs with concrete object syntax","Kats, C.L.; Kalleberg, K.T.; Visser, E.","","2010","In meta-programming with concrete object syntax, meta programs can be written using the concrete syntax of manipulated programs. Quotations of concrete syntax fragments and anti-quotations for meta-level expressions and variables are used to manipulate the abstract representation of programs. These small, isolated fragments are often ambiguous and must be explicitly disambiguated with quotation tags or types, using names from the non-terminals of the object language syntax. Discoverability of these names has been an open issue, as they depend on the (grammar) implementation and are not part of the concrete syntax of a language. Based on advances in interactive development environments, we introduce interactive disambiguation to address this issue, providing real-time feedback and proposing quick fixes in case of ambiguities This paper is a pre-print of: Proceedings of the 3rd International Conference of Software Language Engineering (SLE 2010), Eindhoven (The Netherlands) 12-13 Oct. 2010, Lecture Notes in Computer Science, Springer, 2010","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:5c15a5c7-8bd5-4c88-991d-9eb85a37f398","http://resolver.tudelft.nl/uuid:5c15a5c7-8bd5-4c88-991d-9eb85a37f398","Review of underground logistic systems in the Netherlands: An ex-post evaluation of barriers, enablers and spin-offs","Wiegmans, B.W.; Visser, J.; Konings, R.; Pielage, B.J.A.","","2010","Now, 10 years after the first plans, we analyse in this paper what has happened with Underground Logistic Systems (ULS). The major question in this paper is: Which barriers and enablers led to the failure of ULS and what ULS spin-offs can be found nowadays? Several factors can be classified as barriers or enablers. The main conclusions that can be drawn are that the opportunities for try-out were too limited; political support could have been gained on higher levels; the costs were too high, the catchment area was too limited; ULS in itself is a very promising system, but there was no one clear goal. In particular, the lack of a thorough and positive business model in combination with a lack of sufficient freight volumes almost immediately guaranteed the failure of the initiative. The spin-offs seem to have taken place in different directions: ranging from rather soft impacts (e.g. scientific knowledge) to more hard developments (adopting and developing transport and tunnelling technologies), and, although difficult to quantify, they are of great value.","innovation management; underground freight transport","en","journal article","EUT Edizioni Università di Trieste","","","","","","","","Delft University of Technology","","","","",""
"uuid:588b78a1-f8d8-45fc-855f-fd03699725cf","http://resolver.tudelft.nl/uuid:588b78a1-f8d8-45fc-855f-fd03699725cf","Static Consistency Checking of Web Applications with WebDSL","Hemel, Z.; Groenewegen, D.M.; Kats, L.C.L.; Visser, E.","","2010","Modern web application development frameworks provide web application developers with highlevel abstractions to improve their productivity. However, their support for static verification of applications is limited. Inconsistencies in an application are often not detected statically, but appear as errors at run-time. The reports about these errors are often obscure and hard to trace back to the source of the inconsistency. A major part of this inadequate consistency checking can be traced back to the lack of linguistic integration of these frameworks. Parts of an applications are defined with separate domain-specific languages, which are not checked for consistency with the rest of the application. Examples include regular expressions, query languages and XMLbased languages for definition of user interfaces. We give an overview and analysis of typical problems arising in development with frameworks for web application development, with Ruby on Rails, Lift and Seam as representatives. To remedy these problems, in this paper, we argue that domain-specific languages should be designed from the ground up with static verification and cross-aspect consistency checking in mind, providing linguistic integration of domain-specific sub-languages. We show how this approach is applied in the design of WebDSL, a domain-specific language for web applications, by examining how its compiler detects inconsistencies not caught by web frameworks, providing accurate and clear error messages. Furthermore, we show how this consistency analysis can be expressed with a declarative rule-based approach using the Stratego transformation language. Preprint accepted for publication in Journal of Symbolic Computation, special issue about Automated Specification and Verification of Web Systems, Elsevier 2010","domain-specific language; web application development; linguistic integration; consistency checking; verification; static analysis","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:4a631b42-59a4-47a8-a4ba-5fd2e7757534","http://resolver.tudelft.nl/uuid:4a631b42-59a4-47a8-a4ba-5fd2e7757534","Faster Defect Resolution with Higher Technical Quality of Software","Luijten, B.; Visser, J.","","2010","We performed an empirical study of the relation between technical quality of software products and the defect resolution performance of their maintainers. In particular, we tested the hypothesis that ratings for source code maintainability, as employed by the SIG quality model, are correlated with ratings for defect resolution speed. This study revealed that all but one of the metrics of the SIG quality model show significant positive correlation Preprint accepted for publication in the proceedings of the 4th International Workshop on Software Quality and Maintainability (SQM 2010), Madrid (Spain) 15-18 March, 2010","Software defects; Defect resolution; Maintainability; Source code metrics; Rank correlation; Issue tracker mining","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:22b480a7-d09e-4ae6-abe7-9a5769e03c2b","http://resolver.tudelft.nl/uuid:22b480a7-d09e-4ae6-abe7-9a5769e03c2b","Performing systematic literature reviews with Researchr: Tool demonstration","Visser, E.","","2010","This paper describes the workflow for performing systematic literature reviews with the researchr digital library environment.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:d649654d-3be2-4f68-93a6-77d252e95ba2","http://resolver.tudelft.nl/uuid:d649654d-3be2-4f68-93a6-77d252e95ba2","Encapsulating Software Platform Logic by Aspect-Oriented Programming: A Case Study in Using Aspects for Language Portability","Kats, L.C.; Visser, E.","","2010","Software platforms such as the Java Virtual Machine or the CLR .NET virtual machine have their own ecosystem of a core programming language or instruction set, libraries, and developer community. Programming languages can target multiple software platforms to increase interoperability or to boost performance. Introducing a new compiler backend for a language is the first step towards targeting a new platform, translating the language to the platform’s language or instruction set. Programs written in modern languages generally make extensive use of APIs, based on the runtime system of the software platform, introducing additional portability concerns. They may use APIs that are implemented by platform-specific libraries. Libraries may perform platform-specific operations, make direct native calls, or make assumptions about performance characteristics of operations or about the file system. This paper proposes to use aspect weaving to invasively adapt programs and libraries to address such portability concerns, and identifies four classes of aspects for this purpose. We evaluate this approach through a case study where we retarget the Stratego program transformation language towards the Java Virtual Machine Preprint accepted for publication in Proceedings of the Tenth IEEE International Working Conference on Source Code Analysis and Manipulation (SCAM 2010), Timisoara (Romania), 12-13 Sept. 2010","programming languages; compilers; aspect-oriented programming; Stratego; Spoofax; Java","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:347dcde1-b227-4d8a-b49c-37057a46c2a2","http://resolver.tudelft.nl/uuid:347dcde1-b227-4d8a-b49c-37057a46c2a2","Pure and declarative syntax definition: Paradise lost and regained","Kats, L.C.L.; Visser, E.; Wachsmuth, G.","","2010","Syntax definitions are pervasive in modern software systems, and serve as the basis for language processing tools like parsers and compilers. Mainstream parser generators pose restrictions on syntax definitions that follow from their implementation algorithm. They hamper evolution, maintainability, and compositionality of syntax definitions. The pureness and declarativity of syntax definitions is lost. We analyze how these problems arise for different aspects of syntax definitions, discuss their consequences for language engineers, and show how the pure and declarative nature of syntax definitions can be regained Preprint accepted for publication in Proceedings of Onward!, Tahoe (USA), 17-21 Oct. 2010","design; languages","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:32c028c7-6b7a-4d03-b548-ca5578cfb0ac","http://resolver.tudelft.nl/uuid:32c028c7-6b7a-4d03-b548-ca5578cfb0ac","Integration of Data Validation and User Interface Concerns in a DSL for Web Applications","Groenewegen, D.M.; Visser, E.","","2010","Data validation rules constitute the constraints that data input and processing must adhere to in addition to the structural constraints imposed by a data model. Web modeling tools do not make all types of data validation explicit in their models, hampering full code generation and model expressivity. Web application frameworks do not offer a consistent interface for data validation. In this paper, we present a solution for the integration of declarative data validation rules with user interface models in the domain of web applications, unifying syntax, mechanisms for error handling, and semantics of validation checks, and covering value well-formedness, data invariants, input assertions, and action assertions. We have implemented the approach in WebDSL, a domain-specific language for the definition of web applications.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:16e3b60d-a038-4c0c-b879-d9f9433c8477","http://resolver.tudelft.nl/uuid:16e3b60d-a038-4c0c-b879-d9f9433c8477","The Spoofax language workbench rules for declarative specification of languages and IDEs","Kats, L.C.L.; Visser, E.","","2010","Spoofax is a language workbench for efficient, agile development of textual domain-specific languages with state-of-the-art IDE support. Spoofax integrates language processing techniques for parser generation, meta-programming, and IDE development into a single environment. It uses concise, declarative specifications for languages and IDE services. In this paper we describe the architecture of Spoofax and introduce idioms for high-level specifications of language semantics using rewrite rules, showing how analyses can be reused for transformations, code generation, and editor services such as error marking, reference resolving, and content completion. The implementation of these services is supported by language-parametric editor service classes that can be dynamically loaded by the Eclipse IDE, allowing new languages to be developed and used side-by-side in the same Eclipse environment. Preprint accepted for publication in Proceedings of the 25th Annual ACM SIGPLAN Conference on Object-Oriented Programming, Systems, Languages, and Applications (OOPSLA 2010), Portland (USA), 20-24 Oct. 2010.","coding tools and techniques; programming environments","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:b49ff3b2-ec2a-4b3c-8d3f-807f52da1a96","http://resolver.tudelft.nl/uuid:b49ff3b2-ec2a-4b3c-8d3f-807f52da1a96","The Spoofax language workbench","Kats, L.C.L.; Visser, E.","","2010","Spoofax is a language workbench for efficient, agile development of textual domain-specific languages with state-of-the-art IDE support. It provides a comprehensive environment that integrates syntax definition, program transformation, code generation, and declarative specification of IDE components Preprint accepted for publication in SPLASH 2010, Reno (USA) 17-21 Oct, 2010","languages","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:1a460aca-0a0f-4da8-aa74-c444987fcf55","http://resolver.tudelft.nl/uuid:1a460aca-0a0f-4da8-aa74-c444987fcf55","Experimental demonstration of an intensity minimum at the focus of a laser beam created by spatial coherence: Application to the optical trapping of dielectric particles","Raghunathan, S.B.; Van Dijk, T.; Peterman, E.J.G.; Visser, T.D.","","2010","In trying to manipulate the intensity distribution of a focused field, one typically uses amplitude or phase masks. Here we explore an approach, namely, varying the state of spatial coherence of the incident field. We experimentally demonstrate that the focusing of a Bessel-correlated beam produces an intensity minimum at the geometric focus rather than a maximum. By varying the spatial coherence width of the field, which can be achieved by merely changing the size of an iris, it is possible to change this minimum into a maximum in a continuous manner. This method can be used, for example, in novel optical trapping schemes, to selectively manipulate particles with either a low or high index of refraction.","","en","journal article","Optical Society of America","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:23e3e027-7550-49ef-9cbe-058f68830060","http://resolver.tudelft.nl/uuid:23e3e027-7550-49ef-9cbe-058f68830060","Domain-Specific Languages for Composable Editor Plugins","Kats, L.C.L.; Kalleberg, K.T.; Visser, E.","","2010","Modern IDEs increase developer productivity by incorporating many different kinds of editor services. These can be purely syntactic, such as syntax highlighting, code folding, and an outline for navigation; or they can be based on the language semantics, such as in-line type error reporting and resolving identifier declarations. Building all these services from scratch requires both the extensive knowledge of the sometimes complicated and highly interdependent APIs and extension mechanisms of an IDE framework, and an in-depth understanding of the structure and semantics of the targeted language. This paper describes Spoofax/IMP, a meta-tooling suite that provides high-level domain-specific languages for describing editor services, relieving editor developers from much of the framework-specific programming. Editor services are defined as composable modules of rules coupled to a modular SDF grammar. The composability provided by the SGLR parser and the declaratively defined services allows embedded languages and language extensions to be easily formulated as additional rules extending an existing language definition. The service definitions are used to generate Eclipse editor plugins. We discuss two examples: an editor plugin for WebDSL, a domain-specific language for web applications, and the embedding of WebDSL in Stratego, used for expressing the (static) semantic rules of WebDSL.","domain specific language; integrated development environment; editor plugin","en","journal article","Elsevier","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:88238354-82de-43ee-b05f-750cd41bbf32","http://resolver.tudelft.nl/uuid:88238354-82de-43ee-b05f-750cd41bbf32","A Pure Object-Oriented Embedding of Attribute Grammars","Sloane, A.M.; Kats, L.C.L.; Visser, E.","","2010","Attribute grammars are a powerful specification paradigm for many language processing tasks, particularly semantic analysis of programming languages. Recent attribute grammar systems use dynamic scheduling algorithms to evaluate attributes by need. In this paper, we show how to remove the need for a generator, by embedding a dynamic approach in a modern, object-oriented programming language to implement a small, lightweight attribute grammar library. The Kiama attribution library has similar features to current generators, including cached, uncached, circular, higher-order and parameterised attributes, and implements new techniques for dynamic extension and variation of attribute equations. We use the Scala programming language because of its combination of object-oriented and functional features, support for domain-specific notations and emphasis on scalability. Unlike generators with specialised notation, Kiama attribute grammars use standard Scala notations such as pattern-matching functions for equations and mixins for composition. A performance analysis shows that our approach is practical for realistic language processing.","language processing; compilers; domain-specific languages","en","journal article","Elsevier","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:87c595aa-817b-4836-8c87-11ab547d32de","http://resolver.tudelft.nl/uuid:87c595aa-817b-4836-8c87-11ab547d32de","Integration of data validation and user interface concerns in a DSL for web applications","Groenewegen, D.M.; Visser, E.","","2010","Data validation rules constitute the constraints that data input and processing must adhere to in addition to the structural constraints imposed by a data model. Web modeling tools do not make all types of data validation explicit in their models, hampering full code generation and model expressivity. Web application frameworks do not offer a consistent interface for data validation. In this paper, we present a solution for the integration of declarative data validation rules with user interface models in the domain of web applications, unifying syntax, mechanisms for error handling, and semantics of validation checks, and covering value well-formedness, data invariants, input assertions, and action assertions.We have implemented the approach inWeb-DSL, a domain-specific language for the definition of web applications.","web application; domain-specific language; data validation","en","journal article","Springer","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:cd20db3c-2bac-4a53-be88-20c72125abf5","http://resolver.tudelft.nl/uuid:cd20db3c-2bac-4a53-be88-20c72125abf5","Erosion due to high flow velocities: A description of relevant processes","Bisschop, F.; Visser, P.J.; Van Rhee, C.; Verhagen, H.J.","","2010","Convential models for the erosion of non-cohesive sediments overestimate the erosion rate induced by high flow velocities. These high flow velocities occur, for instance, in breaching of embankments or dunes (flow velocities up to 10 m/s) or in jetting sand with a trailing suction hopper dredger (30 to 60 m/s). At these very large flow velocities the erosion process is significantly influenced by the properties of the soil mass (non-cohesive particles). Governing parameters at higher flow velocities are dilatancy, permeability and the (un)drained shear strength of the soil. The sediment concentration in the water also influences the erosion process, especially in case of higher erosion rates. Based on the concept of Van Rhee (2007, 2010) a simple analytical formula is derived that gives a clear insight into the parameters influencing hindered erosion. The concept of hindered erosion is explained by two properties of granular soils: dilatancy and permeability. This implicates that the erosion behaviour of granular soils cannot be described by the behaviour of single particles alone. The properties of the whole soil mass should be considered in predicting erosion at higher flow velocities. Results of a large-scale breach experiment performed in 1994 in the Zwin Channel in the Netherlands (Visser, 1998) are analyzed to evaluate the formula.","(hindered) erosion; granular sediments; breching; jetting","en","conference paper","ASCE - Texas Digital Library","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:bfb3baf0-de61-4ff5-950c-b00feef5c177","http://resolver.tudelft.nl/uuid:bfb3baf0-de61-4ff5-950c-b00feef5c177","Effects of Spatial Coherence on the Angular Distribution of Radiant Intensity Generated by Scattering on a Sphere","Van Dijk, T.; Fischer, D.G.; Visser, T.D.; Wolf, E.","","2010","In the analysis of light scattering on a sphere it is implicitly assumed that the incident field is spatially fully coherent. However, under usual circumstances the field is partially coherent. We generalize the partial waves expansion method to this situation and examine the influence of the degree of coherence of the incident field on the radiant intensity of the scattered field in the far zone. We show that when the coherence length of the incident field is comparable to, or is smaller than, the radius of the sphere, the angular distribution of the radiant intensity depends strongly on the degree of coherence. The results have implications, for example, for scattering in the atmosphere and colloidal suspensions.","","en","journal article","American Physical Society","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:9db771d8-942b-486d-9580-f81b5fc08973","http://resolver.tudelft.nl/uuid:9db771d8-942b-486d-9580-f81b5fc08973","Observation of linear, nonlinear and singular behavior of the Pancharatnam-Berry phase","van Dijk, T.; Schouten, H.F.; Ubachs, W.; Visser, T.D.","","2010","","polarization; geometric phase; optical switching","en","conference paper","SPIE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Electromagnetism","","","",""
"uuid:6fbfc27e-d02f-4c35-aadf-b1b039d3f8d5","http://resolver.tudelft.nl/uuid:6fbfc27e-d02f-4c35-aadf-b1b039d3f8d5","Providing competitive offshore services ""The Beluga Shipping case""","Visser, M.","","2010","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:ce087190-f7dc-42e0-996d-dbc870d8aab3","http://resolver.tudelft.nl/uuid:ce087190-f7dc-42e0-996d-dbc870d8aab3","Providing competitive offshore services","Visser, M.","","2010","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:afd08ae7-ac92-41e1-b2e6-f556cc7b1d08","http://resolver.tudelft.nl/uuid:afd08ae7-ac92-41e1-b2e6-f556cc7b1d08","Criteria for the evaluation of implemented architectures","Bouwers, E.; Visser, J.; Van Deursen, A.","","2009","Accepted for publication in the Proceedings of the International Conference on Software Maintenance (ICSM), 2009, IEEE Computer Society. Software architecture evaluation methods aim at identifying potential maintainability problems for a given architecture. Several of these methods exist, which typically prescribe the structure of the evaluation process. Often left implicit, however, are the concrete system attributes that need to be studied in order to assess the maintainability of implemented architectures. To determine this set of attributes, we have performed an empirical study on over 40 commercial architectural evaluations conducted during the past two years as part of a systematic “Software Risk Assessment”. We present this study and we explain how the identified attributes can be projected on various architectural system properties, which provides an overview of criteria for the evaluation of the maintainability of implemented software architectures.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:ff2806cc-cccb-4003-bfd9-013e1237ca92","http://resolver.tudelft.nl/uuid:ff2806cc-cccb-4003-bfd9-013e1237ca92","Integration of data validation and user interface concerns in a DSL for web applications","Groenewegen, D.M.; Visser, E.","","2009","This paper is a pre-print of: Danny M. Groenewegen, Eelco Visser. Integration of Data Validation and User Interface Concerns in a DSL for Web Applications. In Mark G. J. van den Brand, Jeff Gray, editors, Software Language Engineering, Second International Conference, SLE 2009, Denver, USA, October, 2009. Lecture Notes in Computer Science, Springer, 2009. Data validation rules constitute the constraints that data input and processing must adhere to in addition to the structural constraints imposed by a data model. Web modeling tools do not address data validation concerns explicitly, hampering full code generation and model expressivity. Web application frameworks do not offer a consistent interface for data validation. In this paper, we present a solution for the integration of declarative data validation rules with user interface models in the domain of web applications, unifying syntax, mechanisms for error handling, and semantics of validation checks, and covering value well-formedness, data invariants, input assertions, and action assertions.We have implemented the approach in WebDSL, a domain-specific language for the definition of web applications.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:c5934978-e3d2-437d-8c67-ba7d7457d975","http://resolver.tudelft.nl/uuid:c5934978-e3d2-437d-8c67-ba7d7457d975","PIL: A platform independent language for retargetable DSLs","Hemel, Z.; Visser, E.","","2009","This paper is a pre-print of: Zef Hemel, Eelco Visser. PIL: A Platform Independent Language for Retargetable DSLs. In Mark G. J. van den Brand, Jeff Gray, editors, Software Language Engineering, Second International Conference, SLE 2009, Denver, USA, October, 2009. Lecture Notes in Computer Science, Springer, 2009. Intermediate languages are used in compiler construction to simplify retargeting compilers to multiple machine architectures. In the implementation of domain-specific languages (DSLs), compilers typically generate high-level source code, rather than low-level machine instructions. DSL compilers target a software platform, i.e. a programming language with a set of libraries, deployable on one or more operating systems. DSLs enable targeting multiple software platforms if its abstractions are platform independent. While transformations from DSL to each targeted platform are often conceptually very similar, there is little reuse between transformations due to syntactic and API differences of the target platforms, making supporting multiple platforms expensive. In this paper, we discuss the design and implementation of PIL, a Platform Independent Language, an intermediate language providing a layer of abstraction between DSL and target platform code, abstracting from syntactic and API differences between platforms, thereby removing the need for platform-specific transformations. We discuss the use of PIL in an implemementation of WebDSL, a DSL for building web applications.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:562de17a-2a9d-479d-b7a2-d85b37e9543a","http://resolver.tudelft.nl/uuid:562de17a-2a9d-479d-b7a2-d85b37e9543a","Providing Rapid Feedback in Generated Modular Language Environments","Kats, L.C.L.; De Jonge, M.; Nilsson-Nyman, E.; Visser, E.","","2009","This paper is a pre-print of: Providing Rapid Feedback in Generated Modular Language Environments. Adding Error Recovery to Scannerless Generalized-LR Parsing. In: Gary T. Leavens, editor, Proceedings of the 24th ACM SIGPLAN Conference on Object-Oriented Programing, Systems, Languages, and Applications (OOPSLA 2009), ACM, 2009. Integrated development environments (IDEs) increase programmer productivity, providing rapid, interactive feedback based on the syntax and semantics of a language. A heavy burden lies on developers of new languages to provide adequate IDE support. Code generation techniques provide a viable, efficient approach to semi-automatically produce IDE plugins. Key components for the realization of plugins are the language’s grammar and parser. For embedded languages and language extensions, constituent IDE plugin modules and their grammars can be combined. Unlike conventional parsing algorithms, scannerless generalized-LR parsing supports the full set of context-free grammars, which is closed under composition, and hence can parse language embeddings and extensions composed from separate grammar modules. To apply this algorithm in an interactive environment, this paper introduces a novel error recovery mechanism, which allows it to be used with files with syntax errors – common in interactive editing. Error recovery is vital for providing rapid feedback in case of syntax errors, as most IDE services depend on the parser – from syntax highlighting to semantic analysis and cross-referencing. We base our approach on the principles of island grammars, and derive permissive grammars with error recovery productions from normal SDF grammars. To cope with the added complexity of these grammars, we adapt the parser to support backtracking. We evaluate the recovery quality and performance of our approach using a set of composed languages, based on Java and Stratego.","languages","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:759b6dda-0d5e-43b7-87f6-23bda131a7f2","http://resolver.tudelft.nl/uuid:759b6dda-0d5e-43b7-87f6-23bda131a7f2","A Pure Object-Oriented Embedding of Attribute Grammars","Sloane, A.M.; Kats, L.C.L.; Visser, E.","","2009","This paper is a pre-print of: Anthony M. Sloane, Lennart C. L. Kats, Eelco Visser. A Pure Object-Oriented Embedding of Attribute Grammars. In T. Ekman and J. Vinju, editors, Proceedings of the Ninth Workshop on Language Descriptions, Tools, and Applications (LDTA’09), Electronic Notes in Theoretical Computer Science. York, United Kingdom, March 2009. Attribute grammars are a powerful specification paradigm for many language processing tasks, particularly semantic analysis of programming languages. Recent attribute grammar systems use dynamic scheduling algorithms to evaluate attributes by need. In this paper, we show how to remove the need for a generator, by embedding a dynamic approach in a modern, object-oriented programming language to implement a small, lightweight attribute grammar library. The Kiama attribution library has similar features to current generators, including cached, uncached, circular, higher-order and parameterised attributes, and implements new techniques for dynamic extension and variation of attribute equations. We use the Scala programming language because of its combination of object-oriented and functional features, support for domain-specific notations and emphasis on scalability. Unlike generators with specialised notation, Kiama attribute grammars use standard Scala notations such as pattern-matching functions for equations and mixins for composition. A performance analysis shows that our approach is practical for realistic language processing.","language processing; compilers; domain-specific languages","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:20763635-72ca-4423-82d9-b7742786f56c","http://resolver.tudelft.nl/uuid:20763635-72ca-4423-82d9-b7742786f56c","Weaving Web Applications with WebDSL (Demonstration)","Groenewegen, D.M.; Visser, E.","","2009","This paper is a pre-print of: Danny M. Groenewegen, and Eelco Visser. Weaving Web Applications with WebDSL (Demonstration). In: Gary T. Leavens (editor) Companion to the 24th ACM SIGPLAN Conference on Object-Oriented Programing, Systems, Languages, and Applications (OOPSLA 2009). WebDSL is a domain-specific language for the development of web applications that integrates data-models, userinterface models, actions, validation, access control, and workflow. The compiler verifies the consistency of applications and generates complete implementations in Java or Python. We illustrate the key concepts of the language with a small web application.","domain-specific languages; web application model; data model; data binding; access control","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:b2a0289f-97e9-4952-b641-a5f700c65a26","http://resolver.tudelft.nl/uuid:b2a0289f-97e9-4952-b641-a5f700c65a26","Designing Syntax Embeddings and Assimilations for Language Libraries","Bravenboer, M.; Visser, E.","","2009","Preprint of paper published in: Models in Software Engineering, Lecture Notes in Computer Science 5002, 2008; doi:10.1007/978-3-540-69073-3_5 Language libraries extend regular libraries with domain-specific notation. More precisely, a language library is a combination of a domain-specific language embedded in the general-purpose host language, a regular library implementing the underlying functionality, and an assimilation transformation that maps embedded DSL fragments to host language code. While the basic architecture for realizing language libraries is the same for all applications, there are many design choices to be made in the design of a particular combination of library, guest language syntax, host language, and assimilation. In this paper, we give an overview of the design space for syntax embeddings and assimilations for the realization of language libraries.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:53cf0bbe-6283-4731-bccc-904a8cd0ad80","http://resolver.tudelft.nl/uuid:53cf0bbe-6283-4731-bccc-904a8cd0ad80","Domain-Specific Languages for Composable Editor Plugins","Kats, L.C.L.; Kalleberg, K.T.; Visser, E.","","2009","This paper is a pre-print of: Lennart C. L. Kats, Karl T. Kalleberg, Eelco Visser. Domain-Specific Languages for Composable Editor Plugins. In T. Ekman and J. Vinju, editors, Proceedings of the Ninth Workshop on Language Descriptions, Tools, and Applications (LDTA’09), Electronic Notes in Theoretical Computer Science. York, United Kingdom, March 2009. Modern IDEs increase developer productivity by incorporating many different kinds of editor services. These can be purely syntactic, such as syntax highlighting, code folding, and an outline for navigation; or they can be based on the language semantics, such as in-line type error reporting and resolving identifier declarations. Building all these services from scratch requires both the extensive knowledge of the sometimes complicated and highly interdependent APIs and extension mechanisms of an IDE framework, and an in-depth understanding of the structure and semantics of the targeted language. This paper describes SPOOFAX/IMP, a meta-tooling suite that provides high-level domain-specific languages for describing editor services, relieving editor developers from much of the frameworkspecific programming. Editor services are defined as composable modules of rules coupled to a modular SDF grammar. The composability provided by the SGLR parser and the declaratively defined services allows embedded languages and language extensions to be easily formulated as additional rules extending an existing language definition. The service definitions are used to generate Eclipse editor plugins. We discuss two examples: an editor plugin for WebDSL, a domain-specific language for web applications, and the embedding of WebDSL in Stratego, used for expressing the (static) semantic rules of WebDSL.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:a1d9daf7-e2f9-4b37-8a04-6f66237be2b9","http://resolver.tudelft.nl/uuid:a1d9daf7-e2f9-4b37-8a04-6f66237be2b9","Non-destructive bulk analysis of the Buggenum sword by neutron resonance capture analysis and neutron diffraction","Postma, H.; Amkreutz, L.; Borella, A.; Clarijs, M.; Kamermans, H.; Kockelmann, W.; Paradowska, A.; Schillebeeckx, P.; Visser, D.","","2009","Two neutron based techniques, neutron resonance capture analysis (NRCA) and time-of-flight neutron-diffraction (TOF-ND) have been used to determine the elemental composition and structure of a precious and very well preserved all-metal sword from the Bronze Age. This Buggenum sword was on loan from the National Museum of Antiquities (NMA) in Leiden (NL). NRCA and TOF-ND experiments have been carried out at a number of more or less identical positions of the sword. The tin-bronze ratio and the relative amounts of some minor elements (Sb, As, Ag, In) have been determined. The results of neutron diffraction measurements showed considerable tin-segregation, and clear indications of hardening on the edges of the blade. In addition, radiographs using Bremsstrahlung revealed the construction of the hilt–blade connection. The work was carried out at the EC Joint Research Centre IRMM in Geel (B) and at the ISIS facility of the Rutherford Appleton Laboratory (UK).","Neutron resonances; Radiography; Non-destructive analysis; Neutron diffraction; Bronze Age","en","journal article","Springer","","","","","","","","Applied Sciences","Radiation, Radionuclides and Reactors","","","",""
"uuid:169743fd-b311-4bbc-b3db-d255bfbc6642","http://resolver.tudelft.nl/uuid:169743fd-b311-4bbc-b3db-d255bfbc6642","Reasoning About Multi-Attribute Preferences (extended abstract)","Hindriks, K.V.; Jonker, C.M.; Visser, W.","","2009","","","en","conference paper","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Intelligent Systems","","","",""
"uuid:3e3433c8-e5eb-4a0f-ada1-7c0d693f0020","http://resolver.tudelft.nl/uuid:3e3433c8-e5eb-4a0f-ada1-7c0d693f0020","Dependency of resolvable gravitational spatial resolution on space-borne observation techniques","Visser, P.N.A.M.; Schrama, E.J.O.; Sneeuw, N.; Weigelt, M.","","2009","The so-called Colombo-Nyquist (Colombo, The global mapping of gravity with two satellites, 1984) rule in satellite geodesy has been revisited. This rule predicts that for a gravimetric satellite flying in a (near-)polar circular repeat orbit, the maximum resolvable geopotential spherical harmonic degree (lmax) is equal to half the number of orbital revolutions (nr) the satellite completes in one repeat period. This rule has been tested for different observation types, including geoid values at sea level along the satellite ground track, orbit perturbations (radial,along-track, cross-track), low-low satellite-to-satellite tracking, and satellite gravity gradiometry observations (all three diagonal components). Results show that the Colombo–Nyquist must be reformulated. Simulations indicate that the maximum resolvable degree is in fact equal to knr + 1, where k can be equal to 1, 2, or even 3 depending on the combination of observation types. However, the original rule is correct to some extent, considering that the quality of recovered gravity field models is homogeneous as a function of geographical longitude as long as l max < nr/2.","","en","conference paper","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:982e1206-9af4-444e-b423-09c6c04d16cb","http://resolver.tudelft.nl/uuid:982e1206-9af4-444e-b423-09c6c04d16cb","Creating polarization singularities with an N-pinhole interferometer","Schoonover, R.W.; Visser, T.D.","","2009","Recent studies of singularities in scalar wave fields in Young’s classic experiment are extended to electromagnetic fields diffracted by an N-pinhole interferometer. Linearly polarized fields whose direction of polarization may be different at each pinhole are examined. It is shown that for two pinholes, only surfaces of linear polarization are created. For N larger than two, a rich structure of polarization singularities is found even when the location of the pinholes is arbitrary. In addition, there can be regions where the spectral density of the field is zero.","","en","journal article","American Physical Society","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:a8276efd-5dc7-4e02-9d5a-a912c1504b65","http://resolver.tudelft.nl/uuid:a8276efd-5dc7-4e02-9d5a-a912c1504b65","Breaching Processes: A state of the art review","Morris, M.; Hassan, M.; Kortenhaus, A.; Visser, P.","TU Braunschweig","2009","This report provides an overview of the state of the art with regards to embankment breach initiation and formation processes. Basic breach formation processes are explained, including a review of commonly held misconceptions. The different stages of breach initiation and formation are also explained, along with the varying needs of different end users, and hence the significance of the different stages of breach and the importance of understanding uncertainty within the different stages of breach prediction. Different types of breach model, from simple empirical formulae through to complex, predictive physically based models. Current capabilities and research initiatives related to each are summarised, identifying current best practice and current data sets available for model validation. Perceived gaps and priorities for future development supporting the improved reliability of breach prediction are then summarised.","Breach; Breach formation; Embankments; Modelling","en","report","HR Wallingford","","","","","","","","","","","","Floodsite",""
"uuid:fa2838a8-4cab-4093-af3e-3f3653e4f75b","http://resolver.tudelft.nl/uuid:fa2838a8-4cab-4093-af3e-3f3653e4f75b","Coherence singularities in the field generated by partially coherent sources","Van Dijk, T.; Schouten, H.F.; Visser, T.D.","","2009","We analyze the coherence singularities that occur in the far field that is generated by a broad class of partially coherent sources. It is shown that for rotationally symmetric planar quasihomogeneous sources the coherence singularities form a two-dimensional surface in a reduced three-dimensional space. We illustrate our results by studying the topology of the coherence singularity of a partially coherent vortex beam. We find that the geometry of the phase singularity can be associated with conic sections such as ellipses, lines, and hyperbolas.","","en","journal article","American Physical Society","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:bff8b2ba-8fd1-4ee3-ae9f-f2e920001e0f","http://resolver.tudelft.nl/uuid:bff8b2ba-8fd1-4ee3-ae9f-f2e920001e0f","Scaling offshore energy converters","Visser, B.","Tol, G. (mentor)","2009","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:18670405-a602-44cb-9dca-ee168765964a","http://resolver.tudelft.nl/uuid:18670405-a602-44cb-9dca-ee168765964a","Zorgvastgoedmonitor 2008: De trage omslag naar strategisch vastgoedmanagement in de zorgsector","Hoepel, H; Visser, S; de Vries, JC (TU Delft Real Estate Management); van der Voordt, Theo (TU Delft Real Estate Management); van der Zwart, J. (TU Delft Real Estate Management)","","2009","","","nl","report","Twijnstra & Gudde en TU Delft","9789074411561","","","","","","","","","Real Estate Management","","",""
"uuid:ff9544b2-7bee-42d7-b4ec-5425eeabcba3","http://resolver.tudelft.nl/uuid:ff9544b2-7bee-42d7-b4ec-5425eeabcba3","Stratego/XT 0.17. A Language and Toolset for Program Transformation","Bravenboer, M.; Kalleberg, K.T.; Vermaas, R.; Visser, E.","","2008","Preprint of paper published in: Science of Computer Programming (Elsevier), 72 (1-2), 2008; doi:10.1016/j.scico.2007.11.003 Stratego/XT is a language and toolset for program transformation. The Stratego language provides rewrite rules for expressing basic transformations, programmable rewriting strategies for controlling the application of rules, concrete syntax for expressing the patterns of rules in the syntax of the object language, and dynamic rewrite rules for expressing context-sensitive transformations, thus supporting the development of transformation components at a high level of abstraction. The XT toolset offers a collection of flexible, reusable transformation components, and tools for generating such components from declarative specifications. Complete program transformation systems are composed from these components. This paper gives an overview of Stratego/XT 0.17, including a description of the Stratego language and XT transformation tools; a discussion of the implementation techniques and software engineering process; and a description of applications built with Stratego/XT.","Stratego; Stratego/XT; program transformation; rewriting strategies; rewrite rules; concrete syntax; dynamic rewrite rules","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:da87cc25-7a44-4a0e-aad2-0041797a0c26","http://resolver.tudelft.nl/uuid:da87cc25-7a44-4a0e-aad2-0041797a0c26","WebDSL: A Domain-Specific Language for Dynamic Web Applications","Groenewegen, D.M.; Hemel, Z.; Kats, L.C.L.; Visser, E.","","2008","Preprint of paper published in: OOPSLA 2008 - ACM SIGPLAN Conference on Object-Oriented Programming, Systems, Languages, and Applications, 19-23 October 2008; doi:10.1145/1449814.1449858 WebDSL is a domain-specific language for the implementation of dynamic web applications with a rich data model. It consists of a core language with constructs to define entities, pages and business logic. Higher-level abstractions, modeling access control and workflow, are defined in a modular fashion as extensions of the core language.","languages; design","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:acf2a439-53a3-4571-a99f-c42ba120b32b","http://resolver.tudelft.nl/uuid:acf2a439-53a3-4571-a99f-c42ba120b32b","Generating Editors for Embedded Languages: Integrating SGLR into IMP","Kats, L.; Kalleberg, K.T.; Visser, E.","","2008","Preprint of paper published in: LDTA 2008: 8th Workshop on Language Descriptions, Tools and Applications, 5 April 2008 Integrated Development Environments (IDEs) increase productivity by providing a rich user interface and rapid feedback for a specific language. Creating an editor for a specific language is not a trivial undertaking, and is a cumbersome task even when working with an extensible framework such as Eclipse. A new IBMguided effort, the IMP framework, relieves the IDE developer from a significant portion of the required work by providing various abstractions for this. For embedded languages, such as embedded regular expressions, SQL queries, or code generation templates, its LALR parser generator falls short, however. Scannerless parsing with SGLR enables concise, modular definition of such languages. In this paper, we present an integration of SGLR into IMP, demonstrating that a scannerless parser can be successfully integrated into an IDE. Given an SDF syntax definition, the sdf2imp tool automatically generates an editor plugin based on the IMP API, complete with syntax checking, syntax highlighting, outline view, and code folding. Using declarative domain-specific languages, these services can be customized, and using the IMP metatooling framework it can be extended with other features.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:d810e7ad-67b7-4f84-a341-1223c45e45dd","http://resolver.tudelft.nl/uuid:d810e7ad-67b7-4f84-a341-1223c45e45dd","Declarative Access Control for WebDSL: Combining Language Integration and Separation of Concerns","Groenewegen, D.; Visser, E.","","2008","Preprint of paper published in: ICWE 2008 - 8th International Conference on Web Engineering, 14-18 July 2008; doi:10.1109/ICWE.2008.15 In this paper, we present the extension of WebDSL, a domain-specific language for web application development, with abstractions for declarative definition of access control. The extension supports the definition of a wide range of access control policies concisely and transparently as a separate concern. In addition to regulating the access to pages and actions, access control rules are used to infer navigation options not accessible to the current user, preventing the presentation of inaccessible links. The extension is an illustration of a general approach to the design of domain-specific languages for different technical domains to support separation of concerns in application development, while preserving linguistic integration. This approach is realized by means of a transformational semantics that weaves separately defined aspects into an integrated implementation.","WebDSL; access control; domain-specific languages; web applications","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:531205dd-9f31-49f6-9433-9b519a4428d6","http://resolver.tudelft.nl/uuid:531205dd-9f31-49f6-9433-9b519a4428d6","Heterogeneous Coupled Evolution of Software Languages","Vermolen, S.; Visser, E.","","2008","Preprint of paper published in: MODELS 2008 - International Conference on Model Driven Engineering Languages and Systems, Lecture Notes in Computer Science 5301; doi:10.1007/978-3-540-87875-9_44 As most software artifacts, meta-models can evolve. Their evolution requires conforming models to co-evolve along with them. Coupled evolution supports this. Its applicability is not limited to the modeling domain. Other domains are for example evolving grammars or database schemas. Existing approaches to coupled evolution focus on a single, homogeneous domain. They solve the co-evolution problems locally and repeatedly. In this paper we present a systematic, heterogeneous approach to coupled evolution. It provides an automatically derived domain specific transformation language; a means of executing transformations at the top level; a derivation of the coupled bottom level transformation; and it allows for generic abstractions from elementary transformations. The feasibility of the architecture is evaluated by applying it to data model evolution.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:abc479a6-97d7-4f99-86e9-9f967d16e0f9","http://resolver.tudelft.nl/uuid:abc479a6-97d7-4f99-86e9-9f967d16e0f9","Generating Version Convertors for Domain-Specific Languages","De Geest, G.; Vermolen, S.D.; Van Deursen, A.; Visser, E.","","2008","Preprint of paper published in: WCRE 2008 - 15th Working Conference on Reverse Engineering, 15-18 October 2008; doi:10.1109/WCRE.2008.50 Domain-specific languages (DSLs) improve programmer productivity by providing high-level abstractions for the development of applications in a particular domain. However, the smaller distance to the application domain entails more frequent changes to the language. As a result, existing DSL models need to be converted to the new version. Manual conversion is tedious and error prone. This paper presents an approach to support DSL evolution by generation of convertors between DSLs. By analyzing the differences between DSL meta-models, a mapping is reverse engineered which can be used to generate reengineering tools to automatically convert models between different versions of a DSL. The approach has been implemented for the Microsoft DSL Tools infrastructure in two tools called DSLCompare and ConverterGenerator. The approach has been evaluated by means of three case studies taken from Avanade’s software development practice.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:1fb56b66-1b08-4e7a-94d9-9d81d694ef72","http://resolver.tudelft.nl/uuid:1fb56b66-1b08-4e7a-94d9-9d81d694ef72","Decorated Attribute Grammars: Attribute Evaluation Meets Strategic Programming (Extended Technical Report)","Kats, L.C.L.; Sloane, A.M.; Visser, E.","","2008","Preprint of paper published in: Compiler Construction, Lecture Notes in Computer Science 5501, 2009; doi:10.1007/978-3-642-00722-4_11 Attribute grammars are a powerful specification formalism for tree-based computation, particularly for software language processing. Various extensions have been proposed to abstract over common patterns in attribute grammar specifications. These include various forms of copy rules to support non-local dependencies, collection attributes, and expressing dependencies that are evaluated to a fixed point. Rather than implementing extensions natively in an attribute evaluator, we propose attribute decorators that describe an abstract evaluation mechanism for attributes, making it possible to provide such extensions as part of a library of decorators. Inspired by strategic programming, decorators are specified using generic traversal operators. To demonstrate their effectiveness, we describe how to employ decorators in name, type, and flow analysis.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:0701814b-a0f1-4b47-9336-559b4a042971","http://resolver.tudelft.nl/uuid:0701814b-a0f1-4b47-9336-559b4a042971","Parse Table Composition: Separate Compilation and Binary Extensibility of Grammars","Bravenboer, M.; Visser, E.","","2008","Preprint of paper published in: Software Language Engineering, Lecture Notes in Computer Science 5452, 2009; doi:10.1007/978-3-642-00434-6_6 Module systems, separate compilation, deployment of binary components, and dynamic linking have enjoyed wide acceptance in programming languages and systems. In contrast, the syntax of languages is usually defined in a non-modular way, cannot be compiled separately, cannot easily be combined with the syntax of other languages, and cannot be deployed as a component for later composition. Grammar formalisms that do support modules use whole program compilation. Current extensible compilers focus on source-level extensibility, which requires users to compile the compiler with a specific configuration of extensions. A compound parser needs to be generated for every combination of extensions. The generation of parse tables is expensive, which is a particular problem when the composition configuration is not fixed to enable users to choose language extensions. In this paper we introduce an algorithm for parse table composition to support separate compilation of grammars to parse table components. Parse table components can be composed (linked) efficiently at runtime, i.e. just before parsing. While the worst-case time complexity of parse table composition is exponential (like the complexity of parse table generation itself), for realistic language combination scenarios involving grammars for real languages, our parse table composition algorithm is an order of magnitude faster than computation of the parse table for the combined grammars.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:e4aad32f-2846-4239-ba87-f3ad60d8204a","http://resolver.tudelft.nl/uuid:e4aad32f-2846-4239-ba87-f3ad60d8204a","WebWorkFlow: An Object-Oriented Workflow Modeling Language for Web Applications","Hemel, Z.; Verhaaf, R.; Visser, E.","","2008","Preprint of paper published in: MODELS 2008 - International Conference on Model Driven Engineering Languages and Systems, Lecture Notes in Computer Science 5301, 2008; doi:10.1007/978-3-540-87875-9_8 Workflow languages are designed for the high-level description of processes and are typically not suitable for the generation of complete applications. In this paper, we present WebWorkFlow, an object-oriented workflow modeling language for the high-level description of workflows in web applications. Workflow descriptions define procedures operating on domain objects. Procedures are composed using sequential and concurrent process combinators. WebWorkFlow is an embedded language, extending WebDSL, a domain-specific language for web application development, with workflow abstractions. The extension is implemented by means of model-to-model transformations. Rather than providing an exclusive workflow language, WebWorkFlow supports interaction with the underlying WebDSL language. WebWorkFlow supports most of the basic workflow control patterns.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:54df4c1c-132d-48e8-8327-96f8208e58c0","http://resolver.tudelft.nl/uuid:54df4c1c-132d-48e8-8327-96f8208e58c0","When Frameworks Let You Down: Platform-Imposed Constraints on the Design and Evolution of Domain-Specific Languages","Groenewegen, D.M.; Hemel, Z.; Kats, L.C.L.; Visser, E.","","2008","Preprint of paper published in: DSM 2008 - Proceedings of the 8th OOPSLA Workshop on Domain-Specific Modeling, Nashville, USA, 19-20 October 2008","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:785efdcd-a963-460f-a3d9-cd96e7d859f4","http://resolver.tudelft.nl/uuid:785efdcd-a963-460f-a3d9-cd96e7d859f4","WebDSL: A Case Study in Domain-Specific Language Engineering","Visser, E.","","2008","Preprint of paper published in: GITTSE 2007 - International Summer School Generative and Transformational Techniques in Software Engineering, 2-7 July 2007, Lecture Notes in Computer Science 5235; doi:10.1007/978-3-540-88643-3_7 The goal of domain-specific languages (DSLs) is to increase the productivity of software engineers by abstracting from low-level boilerplate code. Introduction of DSLs in the software development process requires a smooth workflow for the production of DSLs themselves. This requires technology for designing and implementing DSLs, but also a methodology for using that technology. That is, a collection of guidelines, design patterns, and reusable DSL components that show developers how to tackle common language design and implementation issues. This paper presents a case study in domain-specific language engineering. It reports on a project in which the author designed and built WebDSL, a DSL for web applications with a rich data model, using several DSLs for DSL engineering: SDF for syntax definition and Stratego/XT for code generation. The paper follows the stages in the development of the DSL. The contributions of the paper are three-fold. (1) A tutorial in the application of the specific SDF and Stratego/XT technology for building DSLs. (2) A description of an incremental DSL development process. (3) A domain-specific language for web-applications with rich data models. The paper concludes with a survey of related approaches.","","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:0b76b7ad-17d7-47f7-8aab-b19207f9577a","http://resolver.tudelft.nl/uuid:0b76b7ad-17d7-47f7-8aab-b19207f9577a","Code Generation by Model Transformation: A Case Study in Transformation Modularity","Hemel, Z.; Kats, L.C.L.; Visser, E.","","2008","Preprint of paper published in: Theory and Practice of Model Transformations (ICMT 2008), Lecture Notes in Computer Science 5063; doi:10.1007/978-3-540-69927-9_13 The realization of model-driven software development requires effective techniques for implementing code generators for domain-specific languages. This paper identifies techniques for improving separation of concerns in the implementation of generators. The core technique is code generation by model transformation, that is, the generation of a structured representation (model) of the target program instead of plain text. This approach enables the transformation of code after generation, which in turn enables the extension of the target language with features that allow better modularity in code generation rules. The technique can also be applied to ‘internal code generation’ for the translation of high-level extensions of a DSL to lower-level constructs within the same DSL using model-to-model transformations. This paper refines our earlier description of code generation by model transformation with an improved architecture for the composition of model-to-model normalization rules, solving the problem of combining type analysis and transformation. Instead of coarse-grained stages that alternate between normalization and type analysis, we have developed a new style of type analysis that can be integrated with normalizing transformations in a fine-grained manner. The normalization strategy has a simple extension interface and integrates non-local, context-sensitive transformation rules. We have applied the techniques in a realistic case study of domain-specific language engineering, i.e. the code generator for WebDSL, using Stratego, a high-level transformation language that integrates model-to-model, model-to-code, and code-to-code transformations.","transformation; transformation engineering; term rewriting; webapplication DSL; combination of analysis and transformation","en","lecture notes","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:22b90d92-9e63-4fa0-8d6e-2106912e23f9","http://resolver.tudelft.nl/uuid:22b90d92-9e63-4fa0-8d6e-2106912e23f9","Preprocessing of gravity gradients at the GOCE high-level processing facility","Bouman, J.; Rispens, S.; Gruber, T.; Koop, R.; Schrama, E.; Visser, P.; Tscherning, C.C.; Veicherts, M.","","2008","One of the products derived from the gravity field and steady-state ocean circulation explorer (GOCE) observations are the gravity gradients. These gravity gradients are provided in the gradiometer reference frame (GRF) and are calibrated in-flight using satellite shaking and star sensor data. To use these gravity gradients for application in Earth scienes and gravity field analysis, additional preprocessing needs to be done, including corrections for temporal gravity field signals to isolate the static gravity field part, screening for outliers, calibration by comparison with existing external gravity field information and error assessment. The temporal gravity gradient corrections consist of tidal and nontidal corrections. These are all generally below the gravity gradient error level, which is predicted to show a 1/f behaviour for low frequencies. In the outlier detection, the 1/f error is compensated for by subtracting a local median from the data, while the data error is assessed using the median absolute deviation. The local median acts as a high-pass filter and it is robust as is the median absolute deviation. Three different methods have been implemented for the calibration of the gravity gradients. All three methods use a high-pass filter to compensate for the 1/f gravity gradient error. The baseline method uses state-of-the-art global gravity field models and the most accurate results are obtained if star sensor misalignments are estimated along with the calibration parameters. A second calibration method uses GOCE GPS data to estimate a low-degree gravity field model as well as gravity gradient scale factors. Both methods allow to estimate gravity gradient scale factors down to the 10?3 level. The third calibration method uses high accurate terrestrial gravity data in selected regions to validate the gravity gradient scale factors, focussing on the measurement band. Gravity gradient scale factors may be estimated down to the 10?2 level with this method.","GOCE; High-level processing facility; Gravity gradients; Preprocessing; Calibration","en","journal article","Springer","","","","","","","","Aerospace Engineering","Delft Institute of Earth Observation and Space Systems, DEOS","","","",""
"uuid:b9c4d393-7483-4743-b026-1c5be6db10c5","http://resolver.tudelft.nl/uuid:b9c4d393-7483-4743-b026-1c5be6db10c5","When Frameworks Let You Down: Platform-Imposed Constraints on the Design and Evolution of Domain-Specific Languages","Groenewegen, D.M.; Hemel, Z.; Kats, L.C.L.; Visser, E.","","2008","","","en","conference paper","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:7acff12c-4ee9-4c4b-96fc-870948e12224","http://resolver.tudelft.nl/uuid:7acff12c-4ee9-4c4b-96fc-870948e12224","GOCE gradiometer: Estimation of biases and scale factors of all six individual accelerometers by precise orbit determination","Visser, P.N.A.M.","","2008","A method has been implemented and tested for estimating bias and scale factor parameters for all six individual accelerometers that will fly on-board of GOCE and together form the so-called gradiometer. The method is based on inclusion of the individual accelerometer observations in precise orbit determinations, opposed to the baseline method where so-called common-mode accelerometer observations are used. The method was tested using simulated data from a detailed GOCE system simulator. It was found that the observations taken by individual accelerometers need to be corrected for (1) local satellite gravity gradient (SGG), and (2) rotational terms caused by centrifugal and angular accelerations, due to the fact that they are not located in the satellite’s center of mass. For these corrections, use is made of a reference gravity field model. In addition, the rotational terms are derived from on-board star tracker observations. With a perfect a priori gravity field model and with the estimation of not only accelerometer biases but also accelerometer drifts, scale factors can be determined with an accuracy and stability better than 0.01 for two of the three axes of each accelerometer, the exception being the axis pointing along the long axis of the satellite (more or less coinciding with the flight direction) for which the scale factor estimates are unreliable. This axis coincides with the axis of drag-free control, which results in a small variance of the signal to be calibrated and thus an inaccurate determination of its scale factor in the presence of relatively large (colored) accelerometer observation errors. In the presence of gravity field model errors, it was found that still an accuracy and stability of about 0.015 can be obtained for the accelerometer scale factors by simultaneously estimating empirical accelerations.","Accelerometer; Accelerometer drift; Bias; Calibration; GOCE; Gradiometer; Precise orbit determination; Scale factor","en","journal article","Springer","","","","","","","","Aerospace Engineering","Astrodynamics & Space Missions","","","",""
"uuid:cb07c088-06d2-44ab-a803-6947e217947d","http://resolver.tudelft.nl/uuid:cb07c088-06d2-44ab-a803-6947e217947d","Tracking and orbit determination performance of the GRAS instrument on MetOp-A","Montenbruck, O.; Andres, Y.; Bock, H.; Van Helleputte, T.; Van den IJssel, J.; Loiselet, M.; Marquardt, M.; Silvestrin, P.; Visser, P.; Yoon, Y.","","2008","The global navigation satellite system receiver for atmospheric sounding (GRAS) on MetOp-A is the first European GPS receiver providing dual-frequency navigation and occultation measurements from a spaceborne platform on a routine basis. The receiver is based on ESA’s AGGA-2 correlator chip, which implements a high-quality tracking scheme for semi-codeless P(Y) code tracking on the L1 and L2 frequency. Data collected with the zenith antenna on MetOp-A have been used to perform an in-flight characterization of the GRAS instrument with focus on the tracking and navigation performance. Besides an assessment of the receiver noise and systematic measurement errors, the study addresses the precise orbit determination accuracy achievable with the GRAS receiver. A consistency on the 5 cm level is demonstrated for reduced dynamics orbit solutions computed independently by four different agencies and software packages. With purely kinematic solutions, 10 cm accuracy is obtained. As a part of the analysis, an empirical antenna offset correction and preliminary phase center correction map are derived, which notably reduce the carrier phase residuals and improve the consistency of kinematic orbit determination results.","Precise orbit determination; Phase center variation; Tracking loops; Semi-codeless tracking; AGGA-2; GRAS; MetOp","en","journal article","Springer","","","","","","","","Aerospace Engineering","Delft Institute of earth Observation and Space Systems","","","",""
"uuid:017326b9-5cdd-43cd-b6ba-a1f844b8250d","http://resolver.tudelft.nl/uuid:017326b9-5cdd-43cd-b6ba-a1f844b8250d","Proces-based modeling of the overflow induced growth of erosional channels","Tuan, T.Q.; Stive, M.J.F.; Verhagen, H.J.; Visser, P.J.","","2008","A new process-based approach is introduced for a more efficient computation of the overflow-induced growth of an erosional channel in a noncohesive homogeneous narrow landmass such as the breach growth in a sand-dike. The approach is easy to incorporate in a 1D/2DV morphodynamic model to compute the channel growth both vertically and laterally. The flow modeling is based on the shallow water equations. For modeling the channel growth, a set of closed equations describing the channel growth in both vertical and lateral direction has been derived in connection with several new morphologic parameters such as the representative channel width and the channel cross-sectional growth index. The approach has been applied to simulate the breach growth in sand-dikes and the morphological development of wave overwash across sand barriers. The computational results bear fairly good resemblance with existing experimental data.","overwash; breach growth modeling; wave overtopping; breach widening; breach deepening","en","journal article","Elsevier","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:fbcd98b7-8b8f-4bbd-92a6-65d49d84c134","http://resolver.tudelft.nl/uuid:fbcd98b7-8b8f-4bbd-92a6-65d49d84c134","Inventarisatie ondergrondse infrastructuur: Duurzame Onderhoudsstrategie voor voorzieningen op ‘slappe bodem’","Egyed, C.E.G.; Visser, H.; Tromp, E.","","2008","Eén van de belangrijke onderdelen van het Delft Clusteronderzoek ‘Duurzame onderhoudsstrategie voor voorzieningen op slappe bodem’ is het maken van een afweegmodel, de onderdelen E en F van het onderzoek. Met het model kan een optimale maatregel bepaald worden voor het ophogen van de openbare ruimte. Voor de input van het model en voor het vastleggen van de aanwezige kennis en ervaring op het gebied van ophoogmaatregelen en bouwstoffen is het rapport ‘Ophoogmaatregelen en ophoogmaterialen’ opgesteld, onderdeel B1 van het Delft Clusteronderzoek. In onderdeel B2 ‘Inventarisatie ondergrondse infrastructuur’ wordt de kennis en ervaring op het gebied van riolering, kabels en leidingen toegevoegd. Het doel van deze inventarisatie is tweeledig: 1. Informatie verzamelen voor het afweegmodel om consequenties van het ophogen voor kabels en leidingen (zo mogelijk kwantitatief) te kunnen bepalen. 2. Een overzicht opstellen van de state-of-the-art met betrekking tot de kennis over (het omgaan met) kabels, leidingen en riolen onder verzakkende wegen. Het betreft ophogingen met relatief zware materialen (=referentie) en ophogingen met beperkte zettingen waarbij lichtgewicht materiaal is toegepast. Bij toepassing van lichtgewicht materiaal, waarbij nauwelijks zetting meer optreedt, is de invloed op het functioneren van de kabels en leidingen in de meeste gevallen nihil. Wel kan de bereikbaarheid en de kwaliteit van het systeem in het geding zijn. Deze informatie is deels al in het rapport ‘Ophoogmaatregelen en ophoogmaterialen’ opgenomen.","Delft Cluster; CT03.10; DOS; Duurzame OnderhoudsStrategie; CT03.11.11; slappe bodem; afweegmodel; kabels en leidingen; verzakkende wegen","nl","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:db473be3-7bca-4e55-aacd-f46954d62c31","http://resolver.tudelft.nl/uuid:db473be3-7bca-4e55-aacd-f46954d62c31","Exploring the possibilities for star-tracker assisted calibration of the six individual GOCE accelerometers","Visser, P.N.A.M.","","2008","A method has been developed and tested for estimating calibration parameters for the six accelerometers on board the Gravity field and steady-state Ocean Circulation Explorer (GOCE) from star tracker observations. These six accelerometers are part of the gradiometer, which is the prime instrument on board GOCE. It will be shown that by taking appropriate combinations of observations collected by the accelerometers, by modeling acceleration terms caused by gravity gradients from an a priori low-degree spherical harmonic expansion, and by modeling rotational acceleration terms derived from star-tracker observations, scale factors of each of the accelerometers can be estimated for each axis. Simulated observations from a so-called end-to-end simulator were used to test the method. This end-to-end simulator includes a detailed model of the GOCE satellite, its instruments and instrument errors, and its environment. Results of the tests indicate that scale factors of all six accelerometers can be determined with an accuracy of around 0.01 for all components on a daily basis.","GOCE; Gradiometer; Accelerometers; Star-tracker; Calibration; Bias; Bias drift; Scale factor","en","journal article","Springer","","","","","","","","Aerospace Engineering","Earth Observation and Space Systems","","","",""
"uuid:2ac4cd53-cbc5-492f-895b-5f8fca76e1df","http://resolver.tudelft.nl/uuid:2ac4cd53-cbc5-492f-895b-5f8fca76e1df","Advanced noise abatement departure procedures: Custom optimized departure profiles","Hebly, S.J.; Visser, H.G.","","2008","","","en","conference paper","American Institute of Aeronautics and Astronautics AIAA","","","","","","","","Aerospace Engineering","","","","",""
"uuid:ef4ba8f8-be72-4811-b755-afb6b4c66e39","http://resolver.tudelft.nl/uuid:ef4ba8f8-be72-4811-b755-afb6b4c66e39","Optimization of RNAV Noise abatement arrival trajectories","Hogenhuis, R.H.; Hebly, S.J.; Visser, H.G.","","2008","","trajectory optimization; noise abatement; RNAV procedures","en","conference paper","Optimage Ltd.","","","","","","","","Aerospace Engineering","","","","",""
"uuid:e8c6ddc7-cc04-47be-88a0-429407852aac","http://resolver.tudelft.nl/uuid:e8c6ddc7-cc04-47be-88a0-429407852aac","Optimal Airport Surface Traffic Planning Using Mixed-Integer Linear Programming","Roling, P.C.; Visser, H.G.","","2008","We describe an ongoing research effort pertaining to the development of a surface traffic automation system that will help controllers to better coordinate surface traffic movements related to arrival and departure traffic. More specifically, we describe the concept for a taxi-planning support tool that aims to optimize the routing and scheduling of airport surface traffic in such a way as to deconflict the taxi plans while optimizing delay, total taxi-time, or some other airport efficiency metric. Certain input parameters related to resource demand, such as the expected landing times and the expected pushback times, are rather difficult to predict accurately. Due to uncertainty in the input data driving the taxi-planning process, the taxi-planning tool is designed such that it produces solutions that are robust to uncertainty. The taxi-planning concept presented herein, which is based on mixed-integer linear programming, is designed such that it is able to adapt to perturbations in these input conditions, as well as to account for failure in the actual execution of surface trajectories. The capabilities of the tool are illustrated in a simple hypothetical airport.","","en","journal article","Hindawi Publishing Corporation","","","","","","","","Aerospace Engineering","","","","",""
"uuid:d70bb0e1-9cff-4ff5-b084-154dbe9fc70a","http://resolver.tudelft.nl/uuid:d70bb0e1-9cff-4ff5-b084-154dbe9fc70a","Neutron diffractometer INES for quantitative phase analysis of archaeological objects","Imberti, S.; Kockelmann, W.; Celli, M.; Grazzi, F.; Zoppi, M.; Botti, A.; Sodo, A.; Imperiale, M.L.; De Vries-Melein, M.; Visser, D.; Postma, H.","","2008","","neutron powder diffraction; archaeometry; quantitative phase analysis; Rietveld refinement","en","journal article","IOP","","","","","","","","Applied Sciences","","","","",""
"uuid:6c64ac08-5a51-4b43-93d2-1fc8ffa2f43b","http://resolver.tudelft.nl/uuid:6c64ac08-5a51-4b43-93d2-1fc8ffa2f43b","Spoofax: An Extensible, Interactive Development Environment for Program Transformation with Stratego/XT","Kalleberg, K.T.; Visser, E.","","2007","Preprint accepted for publication in: SeventhWorkshop on Language Descriptions, Tools, and Applications (LDTA’07), pages 47–50, Braga, Portugal, March 2007.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:92f244ff-f30d-4ae6-bc68-c70b2e207d72","http://resolver.tudelft.nl/uuid:92f244ff-f30d-4ae6-bc68-c70b2e207d72","Domain-Specific Language Engineering: A Case Study in Agile DSL Development (Mark I)","Visser, E.","","2007","The goal of domain-specific languages (DSLs) is to increase the productivity of software engineers by abstracting from low-level boilerplate code. Introduction of DSLs in the software development process requires a smooth workflow for the production of DSLs themselves. This tutorial gives an overview of all aspects of DSL engineering: domain analysis, language design, syntax definition, code generation, deployment, and evolution, discussing research challenges on the way. The concepts are illustrated with DSLs for web applications built using several DSLs for DSL engineering: SDF for syntax definition, Stratego/XT for code generation, and Nix for software deployment. Preprint accepted for publication in 2nd Summer School on Generative and Transformational Techniques in Software Engineering, 2 - 7 July, 2007, Braga, Portugal.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:e7b28cd5-2589-40c3-a1fc-0b0e458de235","http://resolver.tudelft.nl/uuid:e7b28cd5-2589-40c3-a1fc-0b0e458de235","Fusing a Transformation Language with an Open Compiler","Kalleberg, K.T.; Visser, E.","","2007","Program transformation systems provide powerful analysis and transformation frameworks as well as concise languages for language processing, but instantiating them for every subject language is an arduous task, most often resulting in halfcompleted frontends. Compilers provide mature frontends with robust parsers and type checkers, but solving language processing problems in general-purpose languages without transformation libraries is tedious. Reusing these frontends with existing transformation systems is therefore attractive. However, for this reuse to be optimal, the functional logic found in the frontend should be exposed to the transformation system – simple data serialization of the abstract syntax tree is not enough, since this fails to expose important compiler functionality, such as import graphs, symbol tables and the type checker. In this paper, we introduce a novel and general technique for combining term-based transformation systems with existing language frontends. The technique is presented in the context of a scriptable analysis and transformation framework for Java built on top of the Eclipse Java compiler. The framework consists of an adapter automatically extracted from the abstract syntax tree of the compiler and an interpreter for the Stratego program transformation language. The adapter allows the Stratego interpreter to rewrite directly on the compiler AST. We illustrate the applicability of our system with scripts written in Stratego that perform framework and library-specific analyses and transformations. This paper is a pre-print of: K. T. Kalleberg and E. Visser. Fusing a Transformation Language with an Open Compiler. In A. Sloane and A. Johnstone, editors, Seventh Workshop on Language Descriptions, Tools, and Applications (LDTA’07), pages 18–31, Braga, Portugal, March 2007.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:5fbcefb3-872d-4fd5-b859-f8804d7c70b6","http://resolver.tudelft.nl/uuid:5fbcefb3-872d-4fd5-b859-f8804d7c70b6","Implementeren verbeteringen in het landelijk temperatuurmodel","Boderie, P.M.A.; Visser, T.","","2007","","watertemperatuur; water temperature; calibratie; model calibration","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:aab5f097-5662-447c-a216-f671c49fa965","http://resolver.tudelft.nl/uuid:aab5f097-5662-447c-a216-f671c49fa965","Preventing Injection Attacks with Syntax Embeddings: A Host and Guest Language Independent Approach","Bravenboer, M.; Dolstra, E.; Visser, E.","","2007","Software written in one language often needs to construct sentences in another language, such as SQL queries, XML output, or shell command invocations. This is almost always done using unhygienic string manipulation, the concatenation of constants and client-supplied strings. A client can then supply specially crafted input that causes the constructed sentence to be interpreted in an unintended way, leading to an injection attack. We describe a more natural style of programming that yields code that is impervious to injections by construction. Our approach embeds the grammars of the guest languages (e.g., SQL) into that of the host language (e.g., Java) and automatically generates code that maps the embedded language to constructs in the host language that reconstruct the embedded sentences, adding escaping functions where appropriate. This approach is generic, meaning that it can be applied with relative ease to any combination of host and guest languages. Preprint accepted for publiction in: Generative Programming and Component Engineering, 6th International Conference, GPCE 2007, Salzburg, Austria, October 1-3, 2007","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:ceeb5582-4e0d-4102-a2e3-846f7312e16a","http://resolver.tudelft.nl/uuid:ceeb5582-4e0d-4102-a2e3-846f7312e16a","Grammar Engineering Support for Precedence Rule Recovery and Compatibility Checking","Bouwers, E.; Bravenboer, M.; Visser, E.","","2007","A wide range of parser generators are used to generate parsers for programming languages. The grammar formalisms that come with parser generators provide different approaches for defining operator precedence. Some generators (e.g. YACC) support precedence declarations, others require the grammar to be unambiguous, thus encoding the precedence rules. Even if the grammar formalism provides precedence rules, a particular grammar might not use it. The result is grammar variants implementing the same language. For the C language, the GNU Compiler uses YACC with precedence rules, the C-Transformers uses SDF without priorities, while the SDF library does use priorities. For PHP, Zend uses YACC with precedence rules, whereas PHP-front uses SDF with priority and associativity declarations. The variance between grammars raises the question if the precedence rules of one grammar are compatible with those of another. This is usually not obvious, since some languages have complex precedence rules. Also, for some parser generators the semantics of precedence rules is defined operationally, which makes it hard to reason about their effect on the defined language. We present a method and tool for comparing the precedence rules of different grammars and parser generators. Although it is undecidable whether two grammars define the same language, this tool provides support for comparing and recovering precedence rules, which is especially useful for reliable migration of a grammar from one grammar formalism to another. We evaluate our method by the application to non-trivial mainstream programming languages, such as PHP and C. Presented at LDTA 2007 Seventh Workshop on Language Descriptions, Tools and Applications, 25-3-2007, Braga, Portugal","precedence; precedence rules; disambiguation; priorities, associativity; grammar engineering; grammar recovery; parsing; YACC; SDF","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:a1bc3456-2b00-4950-a225-64cb5dd1265f","http://resolver.tudelft.nl/uuid:a1bc3456-2b00-4950-a225-64cb5dd1265f","Model-Driven Software Evolution: A Research Agenda","Van Deursen, A.; Visser, E.; Warmer, J.","","2007","Software systems need to evolve, and systems built using model-driven approaches are no exception. What complicates model-driven engineering is that it requires multiple dimensions of evolution. In regular evolution, the modeling language is used to make the changes. In meta-model evolution, changes are required to the modeling notation. In platform evolution, the code generators and application framework change to reflect new requirements on the target platform. Finally, in abstraction evolution, new modeling languages are added to the set of (modeling) languages to reflect increased understanding of a technical or business domain. While MDE has been optimized for regular evolution, presently little or no support exists for metamodel, platform and abstraction evolution. In this paper, we analyze the problems raised by the evolution of model-based software systems and identify challenges to be addressed by research in this area. To be presented at the CSMR 2007 Workshop on Model-Driven Software Evolution (MoDSE), Amsterdam, 20 March 2007.","","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:ac9c5019-4a53-4c2d-ab3c-e5f294d717be","http://resolver.tudelft.nl/uuid:ac9c5019-4a53-4c2d-ab3c-e5f294d717be","Coastal defence solutions (approach of ComCoast)","Verhagen, H.J.; Visser, P.J.","","2007","Along the North Sea coast, water levels are rising and waves are intensifying due to climate change. The best scientific evidence suggests that both phenomena are likely to accelerate over the coming decades. In some North Sea coastal areas also land is sinking and tidal heights and rates of erosion are increasing. This means that the risk of flooding is increasing while more people are living, working and spending their leisure time within the coastal flood plain. With the pressure to build more housing, planners are considering options for development in coastal areas. Flood risk, the environment and a dynamic coastline have to be balanced with this pressure for development. ComCoast is looking at how we use the coastal flood plain today and is seeking multifunctional solutions for its sustainable use in the future. The ComCoast concept is to create a more gradual transition from sea to land, instead of a traditional single line of water defence. The project is developing innovative flood risk management strategies to include wider social and environmental functions such as recreation, fishing, tourism and habitat creation. This approach aims at to highlight possibilities for developing the coastal area with respect to spatial planning, to benefit local and wider communities as well as maintaining the environment.","climate change; coastal protection","en","conference paper","IOER, Dresden, Germany","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:727b411c-a481-4f8c-8ba6-fdd1eeb93fc5","http://resolver.tudelft.nl/uuid:727b411c-a481-4f8c-8ba6-fdd1eeb93fc5","Bruikbaarheidsanalyse van simulatietechnieken om verschillen in prestatieindicatoren tussen directief plannen en zelfgestuurd plannen te kwantificeren en inzichtelijk te maken (summary)","Visser, J.H.","","2007","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:61e253e4-6be4-4f70-8ae4-0445e6827941","http://resolver.tudelft.nl/uuid:61e253e4-6be4-4f70-8ae4-0445e6827941","Bruikbaarheidsanalyse van simulatietechnieken om verschillen in prestatieindicatoren tussen directief plannen en zelfgestuurd plannen te kwantificeren en inzichtelijk te maken (summary)","Visser, J.H.","","2007","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:7fc89d78-a9e1-4f5f-9e26-92daa98e4f91","http://resolver.tudelft.nl/uuid:7fc89d78-a9e1-4f5f-9e26-92daa98e4f91","Accuracy assessment of the monthly GRACE geoids based upon a simulation","Schrama, E.J.O.; Visser, P.N.A.M.","","2007","","Temporal gravity; Hydrology; Ocean bottom pressure; Tides; Air pressure; GRACE; GPS","en","journal article","Springer","","","","","","","","Aerospace Engineering","","","","",""
"uuid:611bc2fe-4248-4086-9aa4-74239a8079f1","http://resolver.tudelft.nl/uuid:611bc2fe-4248-4086-9aa4-74239a8079f1","Bruikbaarheidsanalyse van simulatietechnieken om verschillen in prestatieindicatoren tussen directief plannen en zelfgestuurd plannen te kwantificeren en inzichtelijk te maken","Visser, J.H.","","2007","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:1bcd3bb5-9782-4712-b9cd-9bd4d62f4fb2","http://resolver.tudelft.nl/uuid:1bcd3bb5-9782-4712-b9cd-9bd4d62f4fb2","Model-Driven Software Evolution: A Research Agenda","van Deursen, A. (TU Delft Software Engineering); Visser, Eelco (TU Delft Software Engineering); Warmer, J (Ordina)","Tamzalit, Dalila (editor)","2007","Software systems need to evolve, and systems built using model-driven approaches are no exception. What complicates model-driven engineering is that it requires multiple dimensions of evolution. In regular evolution, the model- ing language is used to make the changes. In meta-model evolution, changes are required to the modeling notation. In platform evolution, the code generators and application framework change to reflect new requirements on the target platform. Finally, in abstraction evolution, new modeling languages are added to the set of (modeling) languages to reflect increased understanding of a technical or business domain. While MDE has been optimized for regular evolution, presently little or no support exists for meta-model, platform and abstraction evolution. In this paper, we an- alyze the problems raised by the evolution of model-based software systems and identify challenges to be addressed by research in this area.","","en","conference paper","University of Nantes","","","","","","","","","","Software Engineering","","",""
"uuid:f6c2834c-11c0-4018-8340-db35d5044004","http://resolver.tudelft.nl/uuid:f6c2834c-11c0-4018-8340-db35d5044004","Stress gradients in CrN coatings","Janssen, G.C.A.M.; Tichelaar, F.D.; Visser, C.C.G.","","2006","Stress in hard films is the net sum of tensile stress generated at the grain boundaries, compressive stress due to ion peening, and thermal stress due to the difference in thermal expansion of the coating and substrate. The tensile part due to grain boundaries is thickness dependent. The other two contributions are not thickness dependent. Summation of the three components leads to a stress gradient in the coating. In the present paper it is demonstrated that adding the three contributions mentioned above yields a good description of the observed dependence of stress on thickness in CrN coatings.","chromium compounds; coatings; tensile strength; grain boundaries; compressive strength; thermal stresses; thermal expansion","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:a898d0a2-aba2-4af4-96a7-c0cf8751a48a","http://resolver.tudelft.nl/uuid:a898d0a2-aba2-4af4-96a7-c0cf8751a48a","Bepalingen standaard wegconstructies t.b.v. afweegmodel DOS","Egyed, C.E.G.; Visser, H.","","2006","In het kader van het DOS-onderzoek naar onderhoud van wegen op slappe bodem, wordt er een afweegmodel ontwikkeld om te kijken welke constructie het beste is bij het ophogen van wegen. Hierin wordt een afweging gemaakt tussen de volgende ophoogmaatregelen: - traditioneel ophogen met ‘zwaar’ materiaal; - ophogen met toepassing van lichtgewicht granulair ophoogmateriaal; - ophogen met EPS; - ophogen met schuimbeton; - zelfdragende constructies; - gewapende constructies op palen. Voor de zettingsberekeningen en het afweegmodel moeten wegconstructies worden bepaald voor wegen die voorkomen in woonwijken. In dit rapport zijn de uitgangspunten voor het bepalen van de wegconstructies vastgelegd en de wegconstructies bepaald. In hoofdstuk 2 van dit rapport is de werkwijze beschreven en in hoofdstuk 3 zijn de uitgangspunten beschreven. In hoofdstuk 4 zijn de standaard wegconstructies bepaald voor wegen met een asfaltverharding en wegen met een elementenverharding.","Delft Cluster; CT03.10; DOS; Duurzaam OnderhoudsStrategie; slappe bodem; CT03.12.11; bepalingen; wegconstructies; afweegmodel; zettingsvoorspellingen; ophogen; zettingsberekeningen","nl","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:333ad630-b4e7-4b0c-9527-46c3df7dabe6","http://resolver.tudelft.nl/uuid:333ad630-b4e7-4b0c-9527-46c3df7dabe6","Ophoogmaatregelen en ophoogmaterialen: Voor voorzieningen op slappe bodem","Egyed, C.E.G.; Visser, H.; Willeboer, M.W.","","2006","Eén van de belangrijke onderdelen van het Delft Clusteronderzoek ‘Duurzame onderhoudsstrategie voor voorzieningen op slappe bodem’ is het maken van een keuzemodel. Met het model kan de meest optimale maatregel worden bepaald voor het opnieuw ophogen van de openbare ruimte. Voor de input van het model en voor het vastleggen van de aanwezige kennis en ervaring wordt in het kader een leidraad opgesteld. Onderdeel daarvan is een inventarisatie van de ophoogmaatregelen en een beschrijving van de bouwstoffen die voor wegen op slappe bodem toegepast worden. In het onderzoek valt dit onder onderdeel B1. Het voorliggend stuk is de rapportage van deze inventarisatie. Hoofdstuk 2 bevat een leeswijzer voor dit rapport. In hoofdstuk 3 zijn de ophoogmaatregelen beschreven. In hoofdstuk 4 worden de bouwstoffen beschreven die voorkomen in de ophoogmaatregelen. In hoofdstuk 5 worden de bronnen voor deze publicatie vermeld en tot slot wordt in bijlage 1 een verklaring gegeven voor de gebruikte begrippen. Prijzen van ophoogmaatregelen en bouwstoffen zijn buiten beschouwing gelaten, omdat het afwegingsmodel mogelijk voor een deel gevoed gaat worden met input uit CROW ontwikkelde keuzemodel voor soort verhardingsconstructie en Beheerkosten openbare ruimte.","Delft Cluster; CT03.10; DOS; Duurzaam OnderhoudsStrategie; CT03.11.11; slappe bodem; ophoogmaatregelen; ophoogmaterialen; keuzemodel; verhardingsconstructie; beheerkosten","nl","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:81201407-467e-4a8f-96e4-1e3889170d36","http://resolver.tudelft.nl/uuid:81201407-467e-4a8f-96e4-1e3889170d36","Zonal winds in the equatorial upper thermosphere: Decomposing the solar flux, geomagnetic activity, and seasonal dependencies","Liu, H.; Lühr, H.; Watanabe, S.; Köhler, W.; Henize, V.; Visser, P.N.A.M.","","2006","Using 3 years (2002–2004), over 16,400 orbits of measurements from the accelerometer on board the CHAMP satellite, we have studied the climatology of the equatorial zonal wind in the upper thermosphere. Several main features are noticed. The most prominent one is that the solar flux significantly influences both the daytime and nighttime winds. It overrides the geomagnetic activity effect, which is found to be rather limited to the nightside. An elevation of the solar flux level from F10.7 ? 100 × 10?22 W m?2 Hz?1 to F10.7 ? 190 × 10?22 W m?2 Hz?1 produces an eastward disturbance wind up to ?110 m s?1. This consequently enhances the nighttime eastward wind but suppresses the daytime westward wind. A seasonal variation with weaker wind (by over 50 m s?1 at night) around June solstice than in other seasons has been observed regardless of solar flux and geomagnetic activity levels. The zonal wind is eastward throughout the night except around June solstice, where it ebbs to almost zero or turns even westward in the postmidnight sector at low solar flux level. The daytime wind is found to be generally more stable than the nighttime wind, particularly unresponsive to geomagnetic activities. Predictions from the Horizontal Wind Model find good agreement with the CHAMP?observed wind at high solar flux levels during nighttime. At low solar flux levels, however, the model strongly underestimates the westward wind during morning hours by 50–120 m s?1 depending on season. The major difference between the HWM?predicted and the CHAMP?observed wind is seen in the phase of its diurnal variation. The CHAMP?observed wind turns eastward around 1200–1300 MLT instead of 1600–1700 MLT predicted by the model. Comparisons with ground FPI observations and the NCAR Thermosphere?Ionosphere?Electrodynamics General Circulation Model (TIEGCM) predictions show that the solar flux effect obtained from CHAMP is consistent with that modeled by TIEGCM. The solar flux dependence of zonal wind found here together with that of the zonal ion drift found in previous studies reflect the relative importance of the E? and F?region wind dynamo in the thermosphere?ionosphere coupling process. Furthermore, these wind measurements indicate that the Earth's atmosphere superrotates. The average superrotation speed amounts to about 22 m s?1 for a solar flux level of F10.7 ? 100 × 10?22 W m?2 Hz?1 but increases to 63 m s?1 for F10.7 ? 190 × 10?22 W m?2 Hz?1. Finally, the wind behavior presented in this study is longitudinally averaged and may differ from wind measurements at a certain longitude.","neutral wind; thermosphere-ionosphere coupling; upper thermosphere","en","journal article","American Geophysical Union","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:5fe73857-ad75-4b76-abe2-4ca391c894e0","http://resolver.tudelft.nl/uuid:5fe73857-ad75-4b76-abe2-4ca391c894e0","Wave overwash at low-crested beach barriers","Tuan, T.Q.; Verhagen, H.J.; Visser, P.J.; Stive, M.J.F.","","2006","To increase physical insight into wave overwash processes at low-crested beach barriers, wave overtopping discharge events rather than the conventional average overtopping discharge need to be quantified. Also, in order to make intelligent use of the many empirical formulations on wave overtopping discharge at breakwaters from literature, a single-valued appropriate slope for a natural beach needs to be derived. To resolve these issues, laboratory experiments of composite-slope low-crested barriers were carried out. The tests deal with overwash on a smooth non-uniform slope on shallow foreshores. The conventional average overtopping discharge concept does not represent the discontinuous character and associated strength of overtopping ow. Instead, e.g. for purposes of morphological modeling, wave overtopping should be treated as an event-based process. In this study, several new parameters such as the wave-averaged overtopping time, the relative total overtopping time, the overtopping asymmetry, the average maximum discharge and the average instantaneous discharge are defined and formulated. A new approach for defining an equivalent slope is proposed in the parameterization of the overtopping discharge that also takes into account effects of the wave period. It is experimentally shown to be an improvement over the conventional approach by Van der Meer (1998), especially eligible for low-crested sandy slopes such as barriers, dikes, dunes, etc on shallow foreshores.","equivalent slope; low crested; shallow foreshores; overwash; event-based; wave overtopping","en","journal article","World Scientific","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:52f8854c-d4c3-4426-ba3a-65674d43ec0a","http://resolver.tudelft.nl/uuid:52f8854c-d4c3-4426-ba3a-65674d43ec0a","Rivierwaterbouwkunde","de Vriend, H.J.; Havinga, H.; Visser, P.J.; Wang, Z.B.","","2006","","","nl","lecture notes","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:4f2ef065-2411-497a-9f61-3ce8b16583de","http://resolver.tudelft.nl/uuid:4f2ef065-2411-497a-9f61-3ce8b16583de","State-of-the-art on automated (underground) freight transport systems for the EU-TREND project","Pielage, B.A.; Rijsenbrij, J.C.; Visser, J.G.","","2006","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:705713ee-3811-4622-b477-9e5f23c78c7f","http://resolver.tudelft.nl/uuid:705713ee-3811-4622-b477-9e5f23c78c7f","Do non-profits make a difference?: Evaluating non-profit vis-à-vis for-profit organisations in social","Koning, P.; Noailly, J.; Visser, S.","","2006","This CPB Document provides a framework for the evaluation of non-profit organisations. This framework addresses the question under which conditions, and, if so, in what way non-profits should be stimulated. Essentially, in order to answer these questions, three steps can be followed: (i) identifying potentially relevant market failures that non-profits may aim to diminish; (ii) linking market failures to observed performance indicators for profits and nonprofits; and (iii) use these insights to derive policy implications: should non-profits be stimulated? We apply the proposed framework to three sectors that are commonly labelled as social services: the care sector, the childcare sector and welfare-to-work services. All these sectors are subject to substantial informational problems regarding the quality of services. When surveying the literature, we find non-profit organisations only to make a difference in some specific cases. So far, there is no strong evidence that can be used as an argument to stimulate non-profit organisations in mixed markets. Moreover, such (targeted) policies may discourage donated labour and private donations, thus rendering them largely ineffective.","firm organisation; non-profit organisations and public enterprise; legal status","en","report","CBP Netherlands Bureau for Economic Policy Analysis","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:976e11ec-137c-4edd-a489-eacc93da012d","http://resolver.tudelft.nl/uuid:976e11ec-137c-4edd-a489-eacc93da012d","Planning, een systeembenadering van directieve sturing, zelfsturing en klantsturing","Visser, J.H.","","2006","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:09eab1e8-e270-4c08-92aa-98ae7ef4c145","http://resolver.tudelft.nl/uuid:09eab1e8-e270-4c08-92aa-98ae7ef4c145","Advances in one-dimensional numerical breach modeling of sand barriers","Tuan, T.Q.; Verhagen, H.J.; Visser, P.J.","","2006","A hydrodynamic numerical model is formulated to describe the breach erosion process of sandy barriers. The breach flow is based on the system of unsteady shallow water equations, which is solved using a robust upwind numerical approach in conjunction with the Finite Volume Method (FVM). The hydraulic jump is considered as part of the breach flow, which escalates the scour hole development in the breach channel during the early stages. To reliably capture the jump, additional source terms are added to enhance the momentum balance in the flow equations. A three-layer refined scheme is used to compute the current profile and the associated sediment transport rate under the effects of the jump. A new approach to model the breach morphological development is proposed, which involves several new morphologic factors such as the channel characteristic width and the channel growth index. The model is capable of predicting the breach growth in both lateral and vertical directions, including the development of the scour hole. Some understanding of breach growth in coastal sand barriers in general can be drawn out based on the results of model simulation. The model is calibrated using the laboratory dike breach data of Caan (1996) and is verified against the field experimental data of the Zwin’s 94.","breaching; overwash; sand barrir","en","conference paper","CUR- Gouda","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:ecaca961-05e1-41a8-ac2b-35441bc6ed8b","http://resolver.tudelft.nl/uuid:ecaca961-05e1-41a8-ac2b-35441bc6ed8b","Planning, een systeembenadering van directieve sturing, zelfsturing en klantsturing (summary)","Visser, J.H.","","2006","","","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:d04ae18e-6332-4f7d-aac4-ddfa4d68934a","http://resolver.tudelft.nl/uuid:d04ae18e-6332-4f7d-aac4-ddfa4d68934a","Numerical modeling of wave overwash on low-crested sand barriers","Tuan, T.Q.; Verhagen, H.J.; Visser, P.J.; Stive, M.","","2006","For management of coastal breaching hazards it is critical to be able to assess the potential of coastal barrier breaching as a result of wave actions during storm surges (wave overwash). This phenomenon is known as the breach initiation phase; the mechanisms behind this are not very well understood. In the present study, laboratory experiments of mobile-bed (sand) barrier were carried out to increase the understanding of the processes of the barrier response during storm surges and also to generate data for calibrating a new numerical overwash model. A numerical model of the barrier response, which integrates the processes of beach and dune erosion and of wave overwash, has been developed. The approach of the UNIBEST-TC model (Bosboom et al., 2000) was adopted for modelling the processes of beach and dune erosion. For modeling wave overwash new overtopping parameters are introduced, based on the approach of Tuan et al. (2006). The model is capable of simulating the time-dependent barrier response during storm surges with occurrence of moderate to severe overwash. Overwash-induced effects on the cross-shore transport processes are also effectively incorporated. The model has been calibrated with the laboratory data on the barrier response (the barrier profile response and the overwash channel development). The process of the barrier response together with its major morphological features was fairly well predicted.","overwash; breaching; dunes; sand barriers","en","conference paper","World Scientific","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9c4b26c6-13e6-4685-8284-fd751e747269","http://resolver.tudelft.nl/uuid:9c4b26c6-13e6-4685-8284-fd751e747269","Zakkende bodem voor beheerkosten een belangrijke factor: Mogelijkheden voor aanpassen van de Beheerkosten Openbare Ruimte (CROW publicatie 145)","Teunissen, P.A.A.; Verhoeven, H.; Visser, H.","","2005","Bij de aanleg én voor het beheer en onderhoud van gemeentelijke infrastructuur is de ondergrond een belangrijke kostenbepalende factor. Voor wegen speelt de draagkracht en vervorming van de bodem hierbij een belangrijke rol. Bijvoorbeeld een weg op een zandondergrond heeft minder intensief onderhoud nodig en heeft een langere levensduur dan op een klei- en veenondergrond. De onderhoudskosten, uitgedrukt in Euro per m2 per jaar, zijn op een zandondergrond dan ook aanmerkelijk lager dan op klei en veen. Voor veel gemeenten met een veenondergrond is de situatie ten aanzien van het onderhoud onbeheersbaar. Door een hoge zettingssnelheid bereikt de drooglegging eerder dan de kwaliteit van de verharding het interventieniveau. Daardoor is niet de kwaliteit van de verharding maatgevend voor de rehabilitatie (ook wel reconstructie genoemd), maar de drooglegging. Het onderhoud wordt hierdoor veelal budgetgestuurd, zodat de kwaliteitslijn in de tijd een dalend verloop heeft. Uiteindelijk resulteert dit in een ‘pappen en nathouden’ aanpak. De onbeheersbare situatie heeft diverse oorzaken, zoals het ontbreken van specifieke technische kaders voor het maken van keuzes of het tekort aan onderhoudsbudget. Dit rapport maakt onderdeel uit van het project “Duurzame Onderhouds Strategie voor voorzieningen op slappe bodem” (verder: DOS). Doel van het DOS project is het leveren van technische know-how voor de afweging van onderhoudsmaatregelen op basis van kosten en maatschappelijke factoren. De technische kaders worden daarmee ingevuld.","Delft Cluster; CT03.10; DOS; Duurzaam Onderhouds Strategie; CT03.11.11; slappe bodem; zakkende bodem; openbare ruimte","nl","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:852adc49-3117-4dc6-b04b-bd446c6fa288","http://resolver.tudelft.nl/uuid:852adc49-3117-4dc6-b04b-bd446c6fa288","Thick-bedded deep-marine sandstones in outcrop and subsurface: Sequence architecture and reservoir modelling aspects","Visser, C.A.","Luthi, S.M. (promotor)","2005","","","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:e0f48b89-93a1-48e6-8251-001b0cd616c5","http://resolver.tudelft.nl/uuid:e0f48b89-93a1-48e6-8251-001b0cd616c5","Evaluation of an Empirical Model to Estimate and Optimize Mechanical Properties of PECVD SiC Films","Pham, H.T.M.; De Boer, C.R.; Visser, C.C.G.; Sarro, P.M.","","2005","In this paper, we present a systematic investigation of the influence of the deposition parameters on the deposition rate, etch rate, and mechanical stress of SiC films prepared by plasma-enhanced chemical vapor deposition (PECVD) technique. Among the relevant deposition parameters, the SiH4 gas flow rate, the main parameter to determine the Si to C ratio, plays a crucial role in controlling the properties of SiC films. By combining a design of experiments with a mathematical technique, an empirical model to control the stress of the PECVD SiC films is obtained. Using this empirical model taking into account the interaction between parameters, the stress of the SiC film can be reduced down to only 22.5 MPa.","silicon compounds; wide band gap semiconductors; semiconductor thin films; plasma CVD; internal stresses","en","journal article","The Electrochemical Society","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Delft Institute of Microsystems and Nanoelectronics","","","",""
"uuid:be5f0a85-ad6e-40ac-a8f3-2028a2c235c8","http://resolver.tudelft.nl/uuid:be5f0a85-ad6e-40ac-a8f3-2028a2c235c8","Plasmon-assisted two-slit transmission: Young's experiment revisited","Schouten, H.F.; Kuzmin, N.; Dubois, G.; Visser, T.D.; Gbur, G.; Alkemade, P.F.A.; Blok, H.; 't Hooft, G.W.; Lenstra, D.; Eliel, E.R.","","2005","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:bc8e9b37-8be4-435f-80ce-8527c19a4ae7","http://resolver.tudelft.nl/uuid:bc8e9b37-8be4-435f-80ce-8527c19a4ae7","A boundary element approach to acoustic radiation and source identification","Visser, René","","2004","","scientific publications","","doctoral thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:703a54b0-51ea-45c8-8891-a89b7989b032","http://resolver.tudelft.nl/uuid:703a54b0-51ea-45c8-8891-a89b7989b032","Connection between phase singularities and the radiation pattern of a slit in a metal plate","Schouten, H.F.; Visser, T.D.; Gbur, G.; Lenstra, D.; Blok, H.","","2004","","","en","journal article","American Physical Society","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:70d80827-8f89-48bc-9e61-f382fc316181","http://resolver.tudelft.nl/uuid:70d80827-8f89-48bc-9e61-f382fc316181","Energy integral method for gravity field determination from satellite orbit coordinates","Visser, P.N.A.M.; Sneeuw, N.; Gerlach, C.","","2003","A fast iterative method for gravity field determination from low Earth satellite orbit coordinates has been developed and implemented successfully. The method is based on energy conservation and avoids problems related to orbit dynamics and initial state. In addition, the particular geometry of a repeat orbit is exploited by using a very efficient iterative estimation scheme, in which a set of normal equations is approximated by a sparse block-diagonal equivalent. Recovery experiments for spherical harmonic gravity field models up to degree and order 80 and 120 were conducted based on a 29-day simulated data set of orbit coordinates. The method was found to be very flexible and could be easily adapted to include observations of non-conservative accelerations, such as (to be) provided by satellites like CHAMP, GRACE, and GOCE. A serious drawback of the method is its large sensitivity to satellite velocity errors. Existing orbit determination strategies need to be altered or augmented to include algorithms that focus on optimizing the accuracy of estimated velocities.","energy integral; gravity field determination; accelerometer observations; block-diagonal matrix; orbit errors; orbit coordinates","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:45abe7f3-5868-4231-a95c-e51667015d2a","http://resolver.tudelft.nl/uuid:45abe7f3-5868-4231-a95c-e51667015d2a","Doorbraak Houtribdijk","Visser, P.J.","","2003","Een verkenning van de mogelijke omvang van de bres(sen) in de Houtribdijk na een eventuele dijkdoorbraak.","Houtribdijk; Markermeer; bresvorming","nl","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","52.640150, 5.408342"
"uuid:b531bbfb-b480-44a4-91e5-25e41440267f","http://resolver.tudelft.nl/uuid:b531bbfb-b480-44a4-91e5-25e41440267f","Light transmission through a subwavelength slit: Waveguiding and optical vortices","Schouten, H.F.; Visser, T.D.; Lenstra, D.; Blok, H.","","2003","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:88e166c8-d1c6-4c1e-b5a4-3932b55fe13d","http://resolver.tudelft.nl/uuid:88e166c8-d1c6-4c1e-b5a4-3932b55fe13d","Aiming at a 1-cm orbit for low earth orbiters: Reduced-dynamic and kinematic precise orbit determination","Visser, P.N.A.M.; Van den IJssel, J.","","2003","The computation of high-accuracy orbits is a prerequisite for the success of Low Earth Orbiter (LEO) missions such as CHAMP, GRACE and GOCE. The mission objectives of these satellites cannot be reached without computing orbits with an accuracy at the few cm level. Such a level of accuracy might be achieved with the techniques of reduced-dynamic and kinematic precise orbit determination (POD) assuming continuous Satellite-to-Satellite Tracking (SST) by the Global Positioning System CGPS). Both techniques have reached a high level of maturity and have been successfully applied to missions in the past, for example to TOPEX/POSEIDON (TIP), leading to Csub-)decimeter orbit accuracy. New LEO gravity missions are (to be) equipped with advanced GPS receivers promising to provide very high quality SST observations thereby opening the possibility for computing cm-level accuracy orbits. The computation of orbits at this accuracy level does not only require high-quality GPS receivers, but also advanced and demanding observation preprocessing and correction algorithms. Moreover, sophisticated parameter estimation schemes need to be adapted and extended to allow the computation of such orbits. Finally, reliable methods need to be employed for assessing the orbit quality and providing feedback to the ditferent processing steps in the orbit computation process.","precise orbit determination; reduced-dynamic; kinematic; GPS; LEO","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:2d0b0b50-e0a6-405e-9f39-68c635153e33","http://resolver.tudelft.nl/uuid:2d0b0b50-e0a6-405e-9f39-68c635153e33","On the joint inversion of SGG and SST data from the GOCE mission","Ditmar, P.; Visser, P.; Klees, R.","","2003","","","en","journal article","European Geosciences Union","","","","","","","","","","","","",""
"uuid:16aa14dc-2fbe-4def-ab4d-04fc9f74f5a0","http://resolver.tudelft.nl/uuid:16aa14dc-2fbe-4def-ab4d-04fc9f74f5a0","Ontwerpnota Stormvloedkering Oosterschelde, Boek 4: De sluitingsmiddelen","Visser, T.","Rijkswaterstaat","2003","Geeft een beschrijving van de sluitingsmiddelen, alsmede een verantwoording van de keuzen die hebben geleid tot het definitieve ontwerp. Bevat achtereenvolgens: Functies en eisen ; Hydraulkisch onderzoek ; Schuiven ; Schuifgeleidingen ; Bewegingswerken ; Elektrische installatie ; Inspectievoertuig schuiven.","stormvloedkering; Oosterschelde; schuiven; gates","nl","report","Rijkswaterstaat, Deltadienst","","","","","","","","","","","","Deltawerken, Oosterschelde",""
"uuid:01b84b14-9fca-4384-b7f7-9d387f81c0e6","http://resolver.tudelft.nl/uuid:01b84b14-9fca-4384-b7f7-9d387f81c0e6","CHAMP gravity field recovery using the energy balance approach","Gerlach, Ch.; Sneeuw, N.; Visser, P.; Svehla, D.","","2003","","","en","journal article","European Geosciences Union","","","","","","","","","","","","",""
"uuid:cd14b8b5-3d74-487d-9e51-b348c52fb05c","http://resolver.tudelft.nl/uuid:cd14b8b5-3d74-487d-9e51-b348c52fb05c","Measuring & modeling in vivo kinetics of primary metabolism","Visser, D.","Heijnen, J.J. (promotor)","2002","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:2ef75809-2f35-41f6-9e92-1c531a10fecd","http://resolver.tudelft.nl/uuid:2ef75809-2f35-41f6-9e92-1c531a10fecd","Polarized neutron diffraction and Mössbauer spectral study of short-range magnetic correlations in the ferrimagnetic layered compounds (PPh4) [FeIIFeIII(ox)3] and (NBu4) [FeIIFeIII(ox)3]","Carling, S.G.; Visser, D.; Hautot, D.; Watts, I.D.; Day, P.; Ensling, J.; Gütlich, P.; Long, G.J.; Grandjean, F.","","2002","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:38587660-b1b1-4fc9-b5c4-5d2d268f1bd2","http://resolver.tudelft.nl/uuid:38587660-b1b1-4fc9-b5c4-5d2d268f1bd2","Order-to-disorder transition in the XY-like quantum magnet Cs2CoCl4 induced by noncommuting applied fields","Kenzelmann, M.; Coldea, R.; Tennant, D.A.; Visser, D.; Hofmann, M.; Smeibidl, P.; Tylczynski, Z.","","2002","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:77a291b0-0103-4383-bd5c-04ac69652d38","http://resolver.tudelft.nl/uuid:77a291b0-0103-4383-bd5c-04ac69652d38","Groei bres in Afsluitdijk na dijkdoorbraak","Visser, P.J.","","2002","Dit rapport bevat een beschrijving van een studie naar de grootte van de bres die in de Afsluitdijk zal kunnen ontstaan nadat deze dijk is doorgebroken en mar de resulterende verhoging van het IJsselmeerpeil. Het doel van de onderhavige studie is een veilige (dus maximale) voorspelling van de totale te verwachten bresgrootte in de Afsluitdijk na het bezwijken van deze dam bij het basispeil van NAP + 5,0 m (waterstand met overschrijdingskans van 10-4). Blijft de bres in de Afsluitdijk beperkt van grootte, dan zal de waterstandsverhoging in het IJsselmeer ook beperkt blijven en zullen de dijken van de polders rondom het IJsselmeer niet in gevaar komen. Wordt de bres in de Afsluitdijk echter zeer groot, dan zal relatief veel van het hoogwater in het IJsselmeer doordringen, als gevolg waarvan de secondaire waterkeringen van het IJsselmeergebied kunnen bezwijken. De Afsluitdijk bevat twee elementen die bij dijkdoorbraak de groei van het stroomgat behoorlijk kunnen beperken, namelijk een keileemdam en een berm- en teenconstructie op het buitentalud. Met de keileemdam is de Zuiderzee afgesloten en tijdens de aanleg van de keileemdam heeft deze stroomsnelheden van ruim 4 m/s langdurig (d.w.z. 2 maanden) weerstaan zonder dat er veel keileem door de stroming is weggeschuurd. Na een consolidatieproces van zo'n 70 jaar zal de weerstand tegen erosie nog verder toegenomen zijn. In de onderhavige studie is de kritieke waarde van begin van erosie gesteld op zo'n 5 m/so Ook een buitenbermconstructie kan behoorlijke stroomsnelheden weerstaan, althans indien het kraagstuk onderaan voldoende is afgestort (zodat het niet opkrult in de sterke stroming) en bovenaan afdoende is verankerd bij de teen van de glooiing. Tijdens de aanleg van de Afsluitdijk hebben vergelijkbare constructies stroomsnelheden van zo'n 6 m/s weerstaan zonder te bezwijken. Dat kleilagen of keileemlagen en bermconstructies op het buitentalud de verdere bresgroei weerstaan dan wel aanzienlijk vertragen is wel gebleken tijdens de stormramp van 1953. Uit 'het verslag over de stormvloed van 1953' (Rijkswaterstaat, 1961) komt heel sterk de indruk naar voren dat alle hoofdwaterkeringen waarin belangrijke doorbraken met relatief diepe stroomgaten ontstonden een relatief hoog voorland of een loswal hadden, of binnendijken waren, en in ieder geval niet een solide bermconstructie hadden. In dijken met een buitenbeloop zoals van de Afsluitdijk ontstond alleen schade aan het buitenbeloop of er ontstonden relatief ondiepe doorbraken in. Verder valt op dat daar waar kleilagen in de ondergrond van de dijk aanwezig waren, deze laag verdere erosie verhinderde dan wel zeer sterk reduceerde (voorbeeld: doorbraak van de Noorddijk in Papendrecht, zie ook Visser, 1998). In 1998 is de eerste versie van het bresgroeimodel BRES (Visser, 1998) voltooid waarmee de ontwikkeling van het stroomgat in een zanddijk na dijkdoorbraak kan worden gesimuleerd. Het model is gevbaseerd op het proces van bresgroei als waargenomen in experimenten in het veld en het laboratoriurn. Het model is ook gekalibreerd en getoetst met de data van deze proeven (Visser, 1998), resulterend in goede overeenkomsten. In deze eerste versie van BRES is het effect van golven nog niet meegenomen; hetzelfde geldt voor het effect van talud- en kruinbekledingen. Aangenomen wordt dat het versnellende effect van golven het vertragende effect van talud- en kruinbekledingen ongeveer opheft.","breach; afsluitdijk; sea defence","nl","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:8853d21c-cb8c-4df1-9add-e7820f6bc33f","http://resolver.tudelft.nl/uuid:8853d21c-cb8c-4df1-9add-e7820f6bc33f","Integrated lifing analysis of a film-cooled turbine blade","Tinga, T.; de Wolf, W.B.; Visser, W.P.J.; Woldendorp, S.","","2001","A method to predict gas turbine component life based on engine performance analysis is demonstrated on a hot section gas turbine component. The mechanical and thermal loading of the first stage high pressure turbine rotor blade of the FlOO-PW-220 engine, one of the most severely loaded components in the engine, is analyzed and a life assessment is performed. For this analysis, engine performance history is obtained from in-flight monitored engine parameters and flight conditions and downloaded for processing by a tool integrating a number of software tools and models. Data acquisition is performed by the FACE system installed in a large number of RNLAF F-16 fighter aircraft. Data then is processed by a thermodynamical engine system model, calculating gas properties like pressure and temperature at the required station in the engine. A computational fluid dynamics model, including the blade film cooling, is used to calculate the heat transfer to the blade. A thermal finite element model calculates the temperature distribution in the component and the stress distribution is obtained with a structural finite element analysis. Finally a life consumption model is used to determine the creep and fatigue damage accumulation in the component. The tool has significant potential to enhance on-condition maintenance and optimize aircraft operational use.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:f385d4fe-3881-4f62-91cb-06e28d68083d","http://resolver.tudelft.nl/uuid:f385d4fe-3881-4f62-91cb-06e28d68083d","Innovation Steps towards Efficient Goods Distribution Systems for Urban Areas","Van Binsbergen, A.J.; Visser, J.G.S.N.","Bovy, P.H.L. (promotor); Priemus, H. (promotor)","2001","The distribution of goods for urban areas is vital to the prosperity of these areas. Nevertheless, there are various environmental and accessibility problems related to the urban goods distribution process. Only a comprehensive set of policy actions, that addresses the problems at different geographical scales and at various functional levels in concert, can solve these problems. These functional levels refer to the organisational aspects of the system (logistics), the goods transport and goods traffic means, the infrastructures, and the spatial system in which the urban goods distribution process must function. Progressive innovation is required on all these levels to achieve an efficient urban goods distribution system, efficient both in terms of commercial interests and societal interests. In the thesis, an integrated long-term problem-solving vision of a future urban goods distribution system is developed. The proposed integrated logistics concept for urban goods distribution, is based on the optimal bundling of the movements of goods (consolidation) in time as well as space. This should be done by providing logistic services, such as city logistics, backbone logistics and network logistics, in close harmony with appropriate technological means, such as advanced vehicle technologies, advanced infrastructures, and other supporting systems. The integrated concepts are based on the application of different transport systems in different areas: that is, the concept is based on intermodality. Introducing such a complex, integrated goods distribution system will require a long string of co-ordinated actions from a wide variety of public and private actors. This necessitates the development and application of an implementation strategy that includes all the necessary actions.","goods distribution; urban areas; organisational optimisation","en","doctoral thesis","Delft University Press","","","","","","","","Trail","","","","",""
"uuid:07f26cd4-41db-4728-9886-1261da5c69e2","http://resolver.tudelft.nl/uuid:07f26cd4-41db-4728-9886-1261da5c69e2","RIVERSandLAND - Dikes for eternity - An ace up our sleeve","Wondergem, P.J.M.; Visser, J.","DWW; Rijkswaterstaat","2001","The question is often raised as to how long the next generations can continue to live and work in low-Iying Dutch Delta. The system of dikes, combined with the limited space for rivers, should guarantee our safety against inundation for the next hundred years, at least. But what do we do thereafter, wh en the sea level continues to rise, precipitation and river discharge continue to increase and the land level continues to subside? Are our dikes there for eternity? Apart from the question whether it is technically and financially feasible to build dikes higher and higher, it is a fact that, when these higher dikes get breached, the consequences become more serious for the inhabitants of the areas behind the dikes and also for their property and possessions.Must our descendants just leave the low-Iying areas, or are there other solutions? (This report is an English translation of: Dijken voor de eeuwigheid? : een troef achter de hand : rapportage Project Rivierenland)","Sea level rise; Dikes; Sea defence","en","report","Rijkswaterstaat, DWW","","","","","","","","","","","","KWP-collection",""
"uuid:fc1ea5b3-47a4-491f-ab87-8236433827ec","http://resolver.tudelft.nl/uuid:fc1ea5b3-47a4-491f-ab87-8236433827ec","Short-range order in the topological spin glass (D3O)Fe3(SO4)2(OD)6 using xyz polarized neutron diffraction","Wills, A.S.; Oakley, G.S.; Visser, D.; Frunzke, J.; Harrison, A.; Andersen, K.H.","","2001","","","en","journal article","American Physcial Society","","","","","","","","","","","","",""
"uuid:a507c40b-3066-41b7-9598-639ee2a011a1","http://resolver.tudelft.nl/uuid:a507c40b-3066-41b7-9598-639ee2a011a1","Reflection-induced spectral changes of the pulsed radiation emitted by a point source","Wiersma, S.H.; Visser, T.D.; de Hoop, A.T.","","2001","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:74d29319-3146-45ec-a3e3-f01d4cacc61a","http://resolver.tudelft.nl/uuid:74d29319-3146-45ec-a3e3-f01d4cacc61a","Approximation Method for the Wash of a Planing Hull","Visser, Douwe B.","","2001","","hydrodynamics","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:4ea19203-6fa1-49bb-9857-f777fa9a7106","http://resolver.tudelft.nl/uuid:4ea19203-6fa1-49bb-9857-f777fa9a7106","An Empirical Method for the Determination of the Wash of a Planing Monohull","Keuning, Lex J.A.; Visser, D.B.","","2001","","hydrodynamics","","journal article","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:220f52ed-275b-40bc-8681-e624b2392044","http://resolver.tudelft.nl/uuid:220f52ed-275b-40bc-8681-e624b2392044","Low-wash design of planing mono-hulls","Visser, Douwe B.","Pinkster, J.A. (mentor)","2001","","hydrodynamics","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:eef4d702-992c-4dff-b09b-25e6f5b7044e","http://resolver.tudelft.nl/uuid:eef4d702-992c-4dff-b09b-25e6f5b7044e","PREHEP: Human error probability based process unit selection","Visser, M.; Wieringa, P.A.","","2001","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:67d41685-3cad-48a1-9bc6-d9eee6303bc5","http://resolver.tudelft.nl/uuid:67d41685-3cad-48a1-9bc6-d9eee6303bc5","Bodemontwikkeling Rijnsysteem","Visser, P.J.","","2000","Een verkenning van omvang, oorzaken, toekomstige ontwikkelingen en mogelijke maatregelen.","riviermorfologie; waterbodem; sedimenttransport","nl","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:f225898c-7e23-430f-a37e-9b159bc537eb","http://resolver.tudelft.nl/uuid:f225898c-7e23-430f-a37e-9b159bc537eb","Overview of NLR Free Flight Project 1997 -1999","Hoekstra, J.M.; Ruigrok, R.; van Gent, R.N.W.H.; Visser, J.; Gijsbers, B.","","2000","NLR has investigated the feasibility of Free Flight concepts with airbome separation during several years of research in collaboration with NASA, the FAA and the RLD (Dutch Civil Aviation Authorities). Issues that have been addressed are: • conflict detection & resolution methods • complex conflict geometries • pilot workload • pilot acceptability • display symbology • safety (both objective & subjective) • mixed equippage procedures • transition issues These issues have been investigated using different techniques, tools and simulations. Off-line traffic simulations comprising up to 400 aircraft simultaneously were used to validate several methods for conflict detection and resolution. This simulated traffic densities up to ten times today's average Western European density. The resolution method that proved to be most effective was based on a publication of Martin Eby of Lincoln Laboratories(MlT). Additionally, complex geometries and restrictions were used to test the robustness of the method. This method has been developed further into an Airbome Separation Assurance System. This ASAS includes a humanmachine interface that has been tested in several flight simulator trials. Air line pilots have been exposed to three times the Western European density and nine time the number of conflicts. No significant increases in workload were found during the cruise phase. The subjects' acceptability proved high and the subjective safety was rated equal or better when compared to today's situation. Further analysis indicated that using this co-operative airbome separation method decreases the collision risk significantly. All studies in the project made use of a resolution method based on exchanging position and velocity information only. No flight plan information, co-ordination procedures, priority mles or groimd based systems proved to be required in order to allow effective separation assurance in the scenarios that were tested. An extra conflict prevention system called predictive ASAS has been developed, which could alleviate a possible need for exchanging flight plan information in the cmise phase. Retrofitting aircraft with such a system is facilitated by the limited requirements for system integration. Because of the simplicity of the architecture and the resolution method, the system proved to be transparant to the crew, allowing a straightforward display design. The traffic display, which is integrated in the navigation display, depicts a horizontal and vertical resolution advisory to the pilot to choose from. Bands on the heading, vertical speed and speed scale show which maneuvers would cause a possible conflict alert. This report describes mainly the airbome perspective. Initial experiments with air traffic controllers in the loop indicated that controllers could collaborate with such a system in order to gain full gate-to-gate coverage. This aspect is described in separate publications. None of the studies could refute the feasibility of airbome separation using such a concept in the cmise phase, even under extremely dense and constrained traffic situations. More detailed information can also be found at the NLR Free Flight Web Site: http://www.nlr.nl/public/hostedsites/freeflight","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:14e67ff1-a600-40a0-b01d-ed90e4971f33","http://resolver.tudelft.nl/uuid:14e67ff1-a600-40a0-b01d-ed90e4971f33","Analysis and Optimisation of European Inland Container Haulage","Visser, W.F.J.","","2000","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:465484b5-c017-4be7-b214-94441d6f456d","http://resolver.tudelft.nl/uuid:465484b5-c017-4be7-b214-94441d6f456d","Analysis and Optimisation of European Inland Container Haulage (summary)","Visser, W.F.J.","","2000","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:62753a09-8f65-43d2-a924-7657cd28e34b","http://resolver.tudelft.nl/uuid:62753a09-8f65-43d2-a924-7657cd28e34b","Simulatie bufferwerking van een containerkraan (summary)","Visser, W.F.J.","","2000","","Computer assignment","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:ae6c952c-ba62-4fdf-9b3a-3a51dde46cf2","http://resolver.tudelft.nl/uuid:ae6c952c-ba62-4fdf-9b3a-3a51dde46cf2","Towards a mechanistic analysis of Benkelman beam deflection measurements","Visser, A.F.H.M.; Priambodo Koesrindartono, D.","","2000","This paper introduces and describes the Benkelman beam deflection test. Furthermore Benkelman beam tests are simulated using two multi-layer programs, based on an elastic and visco-elastic material model for asphalt. The results of these two programs are compared with each other. Finally, using the model based on visco-elasticity as a benchmark, the limiting conditions for elastic analysis are indicated.","Benkelman beam; visco-elasticity; non-destructive testing; lintrack","en","journal article","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:6fa7e335-a0a6-4f18-8589-5f6b6c5ecb89","http://resolver.tudelft.nl/uuid:6fa7e335-a0a6-4f18-8589-5f6b6c5ecb89","Capaciteitsproblematiek van luchthavens en luchtruim","Visser, W.F.J.","","2000","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:e1c08f78-a15c-48a3-92bb-8e028d4d7bda","http://resolver.tudelft.nl/uuid:e1c08f78-a15c-48a3-92bb-8e028d4d7bda","Capaciteitsproblematiek van luchthavens en luchtruim (summary)","Visser, W.F.J.","","2000","","","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:efaa1ee5-6ee7-4d71-b86c-64fcb9dfad69","http://resolver.tudelft.nl/uuid:efaa1ee5-6ee7-4d71-b86c-64fcb9dfad69","An approximation method for the wake wash of planning monohulls","Keuning, Lex J.A.; Visser, Douwe B.","","2000","","hydrodynamics","","conference paper","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:c9463dc5-06e4-4430-bc20-52372d3d25da","http://resolver.tudelft.nl/uuid:c9463dc5-06e4-4430-bc20-52372d3d25da","Chiral critical exponents of the triangular-lattice antiferromagnet CsMnBr3 as determined by polarized neutron scattering","Plakhty, V.P.; Kulda, J.; Visser, D.; Moskvin, E.V.; Wosnitza, J.","","2000","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:23f1dc18-fa0f-4b1f-ba8f-da5b1da51e59","http://resolver.tudelft.nl/uuid:23f1dc18-fa0f-4b1f-ba8f-da5b1da51e59","Simulatie bufferwerking van een containerkraan","Visser, W.F.J.","","2000","","Computer assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:a5aebb80-eb00-4ba7-80cd-3b3ed1bef7c1","http://resolver.tudelft.nl/uuid:a5aebb80-eb00-4ba7-80cd-3b3ed1bef7c1","Historische stedenatlas van Nederland. Afl. 6. Venlo","Hermans, F.; Henderikx, P.A.; Leupen, P.H.D.; Visser, J.C.; Wegner, J.G.","","1999","","Nederland; historische geografie; kaarten; stadsgeschiedenis","nl","book","Delft University Press","","","","","","","","","","","","",""
"uuid:3721e23b-d34c-45a9-8b36-e5930462d8e2","http://resolver.tudelft.nl/uuid:3721e23b-d34c-45a9-8b36-e5930462d8e2","Breach growth in sand-dikes","Visser, P.J.","Battjes, J.A. (promotor)","1998","","","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:4d4ccf8e-f61d-436c-a8ed-19d91e8db4c5","http://resolver.tudelft.nl/uuid:4d4ccf8e-f61d-436c-a8ed-19d91e8db4c5","Extensile hydraulic fracturing of (saturated) porous materials","Visser, J.H.M.","Walraven, J.C. (promotor)","1998","","","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:53699d06-fed2-4fe1-8155-c4cd23172cbc","http://resolver.tudelft.nl/uuid:53699d06-fed2-4fe1-8155-c4cd23172cbc","Cassettes per binnenvaartschip. Een haalbaarheidsstudie naar het vervoer van cassettes per roll-on roll-off binnenvaartschip en de ontwikkeling van een ondersteunend programma ten behoeve van de ladingselectie en routeplanning","Visser, D.W.","","1998","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:697e326a-9b86-474f-8261-cbbe56da2e00","http://resolver.tudelft.nl/uuid:697e326a-9b86-474f-8261-cbbe56da2e00","Human error probability assessment for functional control groups in the process industry","Visser, M.; Wieringa, P.A.","","1998","","complexity; design; reliability","en","conference paper","LAMIH","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:668332ac-f20e-4f50-a319-de7c33492644","http://resolver.tudelft.nl/uuid:668332ac-f20e-4f50-a319-de7c33492644","Cassettes per binnenvaartschip. Een haalbaarheidsstudie naar het vervoer van cassettes per roll-on roll-off binnenvaartschip en de ontwikkeling van een ondersteunend programma ten behoeve van de ladingselectie en routeplanning (summary)","Visser, D.W.","","1998","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:38a083dd-273f-4511-8ea6-5884845b2527","http://resolver.tudelft.nl/uuid:38a083dd-273f-4511-8ea6-5884845b2527","Cassettes per binnenvaartschip. Een haalbaarheidsstudie naar het vervoer van cassettes per roll-on roll-off binnenvaartschip en de ontwikkeling van een ondersteunend programma ten behoeve van de ladingselectie en routeplanning (summary)","Visser, D.W.","","1998","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:018b47ad-3716-4bf7-9a11-5d868ea5529f","http://resolver.tudelft.nl/uuid:018b47ad-3716-4bf7-9a11-5d868ea5529f","Thrust-vectored windshear recovery","Visser, H.G.","","1998","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:cdbb045c-50d7-40dc-b4ef-63e00483fb56","http://resolver.tudelft.nl/uuid:cdbb045c-50d7-40dc-b4ef-63e00483fb56","Cassettes in Roll-on Roll-off transport (summary)","Visser, D.W.","","1998","","","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:b5a21c76-9b75-4d49-87b2-2b3b01d623fc","http://resolver.tudelft.nl/uuid:b5a21c76-9b75-4d49-87b2-2b3b01d623fc","Cassettes in Roll-on Roll-off transport","Visser, D.W.","","1998","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:20cd3f28-ac2b-4761-91c1-7b437da52218","http://resolver.tudelft.nl/uuid:20cd3f28-ac2b-4761-91c1-7b437da52218","Groene zeedijken in Noord-Duitsland en Denemarken: Verslag van een studiereis 3-7 juni 1991","Van der Maas, P.; Muijs, J.; Sprangers, J.T.C.M.; Visser, C.A.","Rijkswaterstaat","1997","Bij zeer veel zeedijken in Sleeswijk-Holstein en op Jutland breken de golven tijdens de maatgevende stormvloeden op grasmatten. Deze groene zeedijken blijken voldoende veilig te zijn. De aanleg wordt gekarakteriseerd door o.a. flauwe buitentaluds en een gedeeltelijke bezoding met zoute kwelderzoden. Bij een voldoende brede kwelder is een harde bekleding overbodig. In Nederland kunnen geheel of gedeeltelijk groene zeedijken onder vergelijkbare randvoorwaarden ook goed voldoen. Dat vraagt een hogere waardering van grasmatten en een andere aanleg en beheer. In het alsnog t.b.v. de advisering opgestelde reisverslag wordt ook ingegaan op de mogelijkheden en problemen in Nederland.","zeedijk; grass slope; grasland; glooiing","nl","report","Rijkswaterstaat, DWW","","","","","","","","","","","","",""
"uuid:c481cdb3-72e1-431e-b1aa-7ae3c77296f3","http://resolver.tudelft.nl/uuid:c481cdb3-72e1-431e-b1aa-7ae3c77296f3","Sulfur compound oxidation and sulfur production by Thiobacillus sp. W5","Visser, J.M.","Kuenen, J.G. (promotor)","1997","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:1e06b716-27e9-429b-bb1f-87418445dab4","http://resolver.tudelft.nl/uuid:1e06b716-27e9-429b-bb1f-87418445dab4","Crew laptop for payload operations","Visser, F.B.; Wolff, M.","","1997","","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:c2f63cff-569b-4281-9ea2-1836a81b9a80","http://resolver.tudelft.nl/uuid:c2f63cff-569b-4281-9ea2-1836a81b9a80","Stedelijk goederenvervoer nu en in de toekomst","Visser, J.G.S.N.; Van der Ham, W.B.; Van Dijk, H.J.; Katgerman, J.","","1997","","goederenvervoer; distributie; transport","nl","book","Delft University Press","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:d4bb4d84-242a-48dc-bdcc-32ad40e0dbe7","http://resolver.tudelft.nl/uuid:d4bb4d84-242a-48dc-bdcc-32ad40e0dbe7","Sulfur production by obligately chemolithoautotrophic Thiobacillus species","Visser, J.M.; Robertson, L.A.; Van Varseveld, H.W.; Kuenen, J.G.","","1997","","hydrogen-sulfide oxidation bacteria removal oxygen; oxidation","en","journal article","","","","","","","","","","","","","",""
"uuid:3115f09d-467b-4b19-8b41-d883f9da2a9b","http://resolver.tudelft.nl/uuid:3115f09d-467b-4b19-8b41-d883f9da2a9b","Thiobacillus sp. W5, the dominant autotroph oxidizing sulfide to sulfur in a reactor for aerobic treatment of sulfidic wastes","Visser, J.M.; Stefess, G.C.; Robertson, L.A.; Kuenen, J.G.","","1997","","chemolithoautotrophic floating filters sulfide sulfur thiobacilli quantitative measurement bacteria cultures","en","journal article","","","","","","","","","","","","","",""
"uuid:7e0a7f2b-e6f9-42cc-8c2a-33ef2a0d9a1f","http://resolver.tudelft.nl/uuid:7e0a7f2b-e6f9-42cc-8c2a-33ef2a0d9a1f","cbb(3)-type cytochrome oxidase in the obligately chemolithoautotrophic Thiobacillus sp. W5","Visser, J.M.; De Jong, G.A.H.; De Vries, S.; Robertson, L.A.; Kuenen, J.G.","","1997","","Thiobacillus Autotrophy Chemolithotrophy Respiratory chain Cytochrome c oxidase Thiobacillus Autotrophie Chimiolithotrophie Chaine respiratoire Cytochrome c oxidase Cytochrome cbb3 Thiobacillus Autotrofia Quimiolitotrofia Cadena respiratoria Cy","en","journal article","","","","","","","","","","","","","",""
"uuid:7a7e6869-ee65-4187-b65d-cd045126ef02","http://resolver.tudelft.nl/uuid:7a7e6869-ee65-4187-b65d-cd045126ef02","A novel membrane-bound flavocytochrome c sulfide dehydrogenase from the colourless sulfur bacterium Thiobacillus sp. W5","Visser, J.M.; De Jong, G.A.H.; Robertson, L.A.; Kuenen, J.G.","","1997","","Thiobacillus sp W5; sulfide oxidation; sulfur formation; flavocytochrome c; Chlorobium limicola; Chromatium vinosum; Thiobacilli","en","journal article","","","","","","","","","","","","","",""
"uuid:de921d0d-d78e-4927-8071-bc85144508ed","http://resolver.tudelft.nl/uuid:de921d0d-d78e-4927-8071-bc85144508ed","Development and operations in the Dutch utilisation centre","Brouwer, M.P.A.M.; Pronk, Z.; Visser, F.B.; de Haas, J.","","1996","At the early beginning (1989) of implementation of the European User Support Organisation (USO) concept, development and implementation of a Dutch Utilisation Centre (DUC) started at NLR premises. After development of several pilot DUC facilities, DUC participated in a Columbus simulation mission and in the 2nd International Micro-gravity Laboratory mission (IML-2). Different ground segment configurations were set up at different locations to meet the specific requirements for the missions. DUC development focuses on achieving a flexible support concept in teleoperations, telerobotics, and visual (video) information processing and presentation, using different communication concepts and video equipment. The configurations are prepared for the purpose of future missions onboard International Space Station. Support will be provided to both experiments and systems operations, such as operations with the European Robotic Arm (ERA). The paper will describe the technical set-up of the DUC, focusing on the communication infrastructure and the ground segment systems for receiving the various data streams.","utilisation centre; user support; DUC; crew support; IML-2; simulation; automation & robotics; International Space Station; ESA","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:a2b9d80d-8199-42a5-bebf-c58fcccf74f2","http://resolver.tudelft.nl/uuid:a2b9d80d-8199-42a5-bebf-c58fcccf74f2","Zwin '94 experiment: Meetopstelling en overzicht van alle meetresultaten","Visser, P.J.; Smit, M.J.; Snip, D.W.","","1996","Beschrijving van de meetopstelling en de meetresultaten van het zwin 1994 experiment alsmede de inhoud van het Zwin 1994 archief.","zwin; bresgroei; dijkdoorbraak; experiment","nl","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","51.370251, 3.369244"
"uuid:9f545a14-fa04-4a55-a60d-fb523e83c690","http://resolver.tudelft.nl/uuid:9f545a14-fa04-4a55-a60d-fb523e83c690","Het Zwin, successen en lessen: Bresgroeiexperimenten 6 en 7 oktober 1994 ""Het totale experiment geslaagd""","Bakker, W.T.; Van der Graaff, J.; Kraak, A.; Smit, M.J.; Snip, D.W.; Steetzel, H.J.; Visser, P.J.","Rijkswaterstaat","1996","In deze rapportage wordt een samenvatting van de achtergronden, de voorbereiding en het verloop van de beide proeven gegeven. Aan de successen die zijn behaald en de lessen die zijn geleerd, wordt aandacht besteed. De proeven vormen een onderdeel van het onderzoek naar dijkdoorbraakprocessen dat in opdracht van de Dienst Weg- en Waterbouwkunde van Rijkswaterstaat voor de Technische Adviescommissie voor de Waterkeringen wordt uitgevoerd. Omdat het in deze gevallen om onverdedigde zanddammen gaat, wordt in deze rapportage steeds de term 'damdoorbraak' in plaats van 'dijkdoorbraak' gebruikt.","dike breach; Zwin; dijkdoorbraak","nl","report","TU Delft, Department Hydraulic Engineering","","","","","","","","","","","","TAW/ENW","51.365863, 3.370401"
"uuid:77373e30-eb6d-4974-b3e0-16320c650fe3","http://resolver.tudelft.nl/uuid:77373e30-eb6d-4974-b3e0-16320c650fe3","Het Zwin, successen en lessen: Bresgroeiexperimenten op 6 en 7 oktober 1994","Bakker, W.T.; Van de Graaff, J.; Kraak, A.W.; Smit, M.J.; Snip, D.W.; Steetzel, H.J.; Visser, P.J.","","1996","Op 6 en 7 oktober 1994 hebben twee grootschalige damdoorbraakexperimenten plaatsgevonden in Het Zwin in Zee uwsch-Vlaanderen. Vooral het eerste experiment op 6 oktober heeft veel publicitaire aandacht getrokkcn. Op het beslissende ogenblik, het begin van de proef rondom het tijdstip van hoogwater, verliep deze proef niet volgens verwachting. Het doorbraakproces kwam slecht op gang. Uiteindelijk werd een bescheiden gat bereikt; de gatbreedte bedroeg aan het eind van de proef ongeveer 13 meter. Direct na de afloop van de proef op 6 oktober werd besloten de proef op 7 oktober te herhalen. Op 7 oktober verliep de proef volledig naar wens. In 1 uur tijd werd uiteindelijk een gatbreedte van ongeveer 41 meter bereikt. In deze rapportage wordt een samenvatting van de achtergronden, de voorbereiding en het verloop van de beide proeven gegeven. Aan de successen die zijn behaald en de lessen die z ijn geleerd, wordt aandacht besteed. De proeven vormen een onderdeel van het onderzoek naar dijkdoorbraakprocessen dat in opdracht van de Dienst Weg- en Waterbouwkunde van Rijkswaterstaat voor de Technische Adviescommissie voor de Waterkeringen wordt uitgevoerd. Omdat het in deze gevallen om onverdedigde zanddammen gaat, wordt in deze rapportage steeds de term 'damdoorbraak' in plaats van 'dijkdoorbraak' gebruikt.","breach; dune; dambreak","nl","report","TAW","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9c39b812-7a01-4c01-a3de-b0117ced07fa","http://resolver.tudelft.nl/uuid:9c39b812-7a01-4c01-a3de-b0117ced07fa","Produktie van propeenoxide m.b.v. N20","Beukers, J.T.; Ham, B.T.; Reinink, H.; Visser, S.","","1996","","propeenoxide; lachgas; nser; directe oxidatie; atomaire zuurstof","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:59b6c789-bdd7-4663-9b30-63fb74d165d2","http://resolver.tudelft.nl/uuid:59b6c789-bdd7-4663-9b30-63fb74d165d2","Dry and hydraulic extensile fracturing of porous impermeable materials","Visser, J.H.M.; Van Mier, J.C.M.","","1996","Extensile hydraulic fracturing of mortar is investigated and compared to extensile dry fracturing of sandstone. The extensile fracture experiments have been performed in a Hookean cell in deformation control. The cell allows for axial loading and radial fluid pressure loading of cylindrical specimens. Variables in the experiments are the load path and the degree of saturation. In the dry fracturing tests, the sandstone specimens are sleeved. In the hydraulic fracture experiments, the mortar specimens are not sleeved so that the radial fluid pressure is free to enter the notch and the fracture once it is initiated. In the dry fracturing experiments, the sandstone becomes more ductile for increasing hydrostatic stress. In the hydraulic fracture experiments, the mortar remains brittle. The results of the hydraulic fracture experiments are very similar for the unsaturated mortar (degree of saturation 69%) and the saturated mortar (degree of saturation 100%). The saturated mortar behaves stiffer and has higher failure stresses due to the effect of pore pressures. Fracture propagation in the saturated mortar requires lower stresses, although the difference with fracture propagation in the unsaturated mortar is minor.","extensile dry fracturing experiments; extensile hydraulic fracturing experiments; load path; degree of saturation; sandstone; mortar; pore pressure","en","journal article","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:4ec7d370-3879-4139-b24f-c3bfed1ab082","http://resolver.tudelft.nl/uuid:4ec7d370-3879-4139-b24f-c3bfed1ab082","Simulatie van een wachtrijsysteem met batchbehandeling","Visser, D.W.","","1996","","Computer assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:4e3507b4-f7a9-4273-9206-fc1d2d967b6e","http://resolver.tudelft.nl/uuid:4e3507b4-f7a9-4273-9206-fc1d2d967b6e","Lateral escape guidance strategies for microburst windshear encounters","Visser, H.G.","","1996","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:aaa95caf-7ac1-4261-986c-955935492ea8","http://resolver.tudelft.nl/uuid:aaa95caf-7ac1-4261-986c-955935492ea8","Purification and characterization of a periplasmic thiosulfate dehydrogenase from the obligately autotrophic Thiobacillus sp W5","Visser, J.M.; De Jong, G.A.H.; Robertson, L.A.; Kuenen, J.G.","","1996","","oxidation; Thiobacilli chemolithoautotrophy thiosulfate dehydrogenase thiosulfate tetrathionate cytochrome c respiratory chain oxidizing enzyme oxidation novellus growth resolution tepidarius proteins system cells","en","journal article","","","","","","","","","","","","","",""
"uuid:3729e3e5-b96f-4929-9701-619fd7795391","http://resolver.tudelft.nl/uuid:3729e3e5-b96f-4929-9701-619fd7795391","De produktie van propeenoxide","Groot, Y.J.M.; Janssen, R.J.M.; Storm, A.H.R.; Visser, S.B.","","1995","","propeenoxide; waterstofperoxide; anthraquinone; titanium-silicaliet-1; autoxidation","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:75f115ae-2545-4ebd-8f5c-cfe7397cf3d7","http://resolver.tudelft.nl/uuid:75f115ae-2545-4ebd-8f5c-cfe7397cf3d7","Het DAMS project (DUC in APM Mission Simulation) samenvatting","Visser, F.B.; Pronk, Z.","","1995","Als onderdeel van de ontwikkeling en evaliratie van 'crew-support tools' en mens-machine interfaces, zijn de afgelopen jaren bij ESTEC in Noordwijk enkele missie-simulaties georganiseerd. Deze simulaties vonden plaats in het 'Crew Workstation Testbed'. Een van de doelstellingen van zo'n simulatie, die gehouden zou worden in mei 1994, was het inbrengen en evalueren van Pl/gebruikersondersteuning zoals gedefinieerd in het USO-concepL In dit kader heeft een Nederlands industrieel consortium, in opdracht van ESA en het NIVR, een pilot 'Dutch Utilisation Centre' (DUC) uitgewerkt en opgezet. Dit DUC-consortium bestond uit het Nationaal Lucht- en Ruimtevaartlaboratorium als 'prime contractor' met Fokker Space & Systems, BSO Nieuwegein BV, Comprimo Consulting Services BV, Bradford Engineering en ICT Automatisering Deventer BV als 'sub contractors'. Door het consortium werden een aantal elementen voor zowel vlucht- als grondsegment ontwikkeld. Voor het vluchtsegment werd een 'payload'rek ontwikkeld met daarin twee faciliteiten ten behoeve van het uitvoeren van experimenten: de 'High Performance Capillary Electrophoresis' faciliteit en de Glovebox. Voor het grondsegment werd een DUC-operationele omgeving gerealiseerd, met daarin diverse systemen ter ondersteuning van de communicatie tussen vlucht- en grondsegment en voor het op afstand bedienen van experimenten in het vluchtsegment. Ten behoeve van de simulatie werden ook twee experimenten voorbereid. Eén experiment had als doel de bestudering van de ontwikkeling van padde-eieren en het andere de invloed van vitamine-K op het botontkalkings proces dat bij astronauten onder micro-zwaartekracht plaatsvindt. Beide experimenten hadden micro-zwaartekracht relevantie: het padde-eieren experiment is al enkele malen uitgevoerd tijdens Spacelab- en sondeerraketmissies, het vitamine-K experiment wordt voorbereid voor de EUROMIR 95 missie. Door omstandigheden werd de simulatie op ESTEC locatie afgelast. Teneinde toch de ontwikkelde systemen en het ondersteunings concept te kunnen evalueren werd een missiedemonstratie georganiseerd bij het NLR. Tijdens deze, drie dagen durende, demonstratie werden alle systemen succesvol ingezet. De demonstratie maakte de evaluatie van alle aspecten aangaande payload ontwikkeling, gebruikersondersteuning en crew-experiment operaties mogelijk, wat mede blijkt uit de reactie van ESTEC op de demonstratie (App. A). Dit rapport geeft een overzicht van de activiteiten zoals uitgevoerd door het DUC-consortium","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:e230ac46-de7a-462f-8707-16f4b5645ce4","http://resolver.tudelft.nl/uuid:e230ac46-de7a-462f-8707-16f4b5645ce4","Utilisatie technologie in Nederland","Visser, F.B.","","1995","Het doel van deze notitie is het samenvatten van de ideeën die binnen de Nederlandse industrie en het NLR bestaan met betrekking tot gebruik van ruimte-infrastructuren en de daaraan gerelateerde technologie. Daarnaast wordt een beeld geschetst van de toekomstverwachtingen die bestaan.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:edb00e60-f394-4749-b190-85cf00eadb7e","http://resolver.tudelft.nl/uuid:edb00e60-f394-4749-b190-85cf00eadb7e","Oxygen requirements of fermentative yeasts","Visser, W.","Kuenen, J.G. (promotor)","1995","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:7f4eeacc-43e4-4392-8298-0953688dcb45","http://resolver.tudelft.nl/uuid:7f4eeacc-43e4-4392-8298-0953688dcb45","Effects of growth conditions on mitochondrial morphology in Saccharomyces cerevisiae","Visser, W.; Van Spronsen, E.A.; Nanninga, N.; Pronk, J.T.; Kuenen, J.G.; Van Dijken, J.P.","","1995","","Saccharomyces cerevisiae Mitochondria Morphology Metabolism Cell respiration Fermentation Environmental factor Ethanol Glucose Oxygen Yeast Saccharomyces cerevisiae Mitochondrie Morphologie Metabolisme Respiration cellulaire Fermentation Facteur milieu Et","en","journal article","","","","","","","","","","","","","",""
"uuid:fad90b19-9d14-48d9-b722-b96037f77b22","http://resolver.tudelft.nl/uuid:fad90b19-9d14-48d9-b722-b96037f77b22","A minimal optimal control analysis of lateral escape maneuvers for microburst encounters","Visser, H.G.","","1995","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:5a30a377-3393-43f5-965d-88b103acf9c4","http://resolver.tudelft.nl/uuid:5a30a377-3393-43f5-965d-88b103acf9c4","MIFAS, Modular interactive Fast-time ATC simulator version 1.0","Visser, H.G.","","1995","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:626b10c7-2eb8-465f-aa62-a090d3a9b8c2","http://resolver.tudelft.nl/uuid:626b10c7-2eb8-465f-aa62-a090d3a9b8c2","Implementation of USO concept in Crew Workstation testbed activities: Executive Summary","Pronk, Z.; Visser, F.B.","","1994","As part of the evaluation of man-machine interfaces for Columbus utilisation, manned mission simulations have been performed for some years in the Crew Workstation Test-Bed at ESTEC, Noordwijk. A mission simulation was scheduled for May 1994, to include new concepts for crew and user support, and to aim at increased realism for payload operations and communications. The development of a pilot Dutch Utilisation Centre (DUC) was one of the major objectives for a Dutch consortium, studying the infrastructural elements of a DUC. Since this effort focused on Dutch candidate Space Station payload elements, the DUC was considered to be a suitable user support centre to enhance the realism of the mission simulation. The European Space Agency (ESA) and the Dutch Agency for Aero.space Programmes (NIVR) together initiated the project ""Implementation of USO concept in Crew Workstation Testbed activities (DAMS)"". A main objective of this project was to evaluate the user support concept as defined by the User Support Operations (USO) team under contract with ESA Columbus Utilisation from 1989 to 1992, by participating in a planned five-day mission simulation. To evaluate advanced man-machine interfaces and crew support, the DUC consortium prepared and implemented an end to- end manned payload operations concept. The target ""onboard"" segment was an instrumented Space Station/Columbus double-rack, the so-called Biology Facility (a class-1 facility), and two multi-user (class-2) facilities: a Glovebox based on the Shuttle Middeck Locker type, and the High Performance Capillary Electrophoresis (HPCE) instrument. In addition some experiment dedicated breadboard facilities were developed and implemented in the Biology Facility. Two realistic experiments were prepared as part of the DAMS project. One concerned the investigation of toad egg development under microgravity after in-flight fertilisation. The second experiment was to determine the effect of Vitamin K intake by astronauts on the bone demineralisation process, by analyzing astronaut's urine samples. Experiment preparation included not only payload hardware development and commissioning, but also development of timelines and crew operations software. Since the planned mission simulation at ESTEC was cancelled due to ESA budgetary problems, a three-day mission simulation was set-up at NLR, to evaluate the final DAMS payload operation concept. DUC provided (operational) support to the two experienced Principal Investigators (PI) performing the two experiments. These experiments were controlled from an ""onboard"" CrewPC and two identical ground-based systems, the GroundPCs. These systems used identical and synchronised human computer interfaces and multimedia data bases. The mission simulation was very successful in that all aspects related to payload development, user support concept, and crew operations development, implementation and execution could be demonstrated and evaluated. This report gives an overview of the activities and the results.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:069fc93e-8b65-49cd-8d34-a15f89eb1fad","http://resolver.tudelft.nl/uuid:069fc93e-8b65-49cd-8d34-a15f89eb1fad","A model for breach growth in a sand-dike and its prediction for the Zwin 94 experiment","Visser, P.J.","","1994","A mathematical model for breach growth in sand-dikes and dunes is described. The model is based on the five-step breach erosion process as observed in several laboratory experiments and the Zwin 89 field experiment. A simplified Galappatti (1983) pick up mechanism for sand from the bed is combined with Bagnold's (1963) modified (Visser, 1988) energetics-based sand transport conception to describe the breach erosion. The test of the model to the data of the Zwin 89 experiment shows good agreement. Finally, a prediction for the growth of the breach width in the Zwin 94 experiment is given.","breach growth; sand dikes; dunes; breach erosion; Zwin; energetics-based sand transport","en","report","TU Delft, Department of Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:4987808a-9937-444b-99a3-4bb4ba9f9cc2","http://resolver.tudelft.nl/uuid:4987808a-9937-444b-99a3-4bb4ba9f9cc2","Effects of oxygen limitation on sugar metabolism in yeasts: A continuous-culture study of the Kluyver effect","Weusthuis, R.A.; Visser, W.; Pronk, J.T.; Scheffers, W.A.; Van Dijken, J.P.","","1994","","Saccharomyces cerevisiae; Candida zltilis; sugar metabolism; oxygen limitation; Kluyver effect","en","journal article","Cambridge University Press","","","","","","","","Applied Sciences","","","","",""
"uuid:278c156b-aed6-4b14-b9ab-791868146536","http://resolver.tudelft.nl/uuid:278c156b-aed6-4b14-b9ab-791868146536","A functional damper model for use in vehicle suspension system models","Visser, D.M.","","1994","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:17b2cd01-8c0b-4395-aadd-1243f478b427","http://resolver.tudelft.nl/uuid:17b2cd01-8c0b-4395-aadd-1243f478b427","A 4-D trajectory optimization and guidance technique for terminal area traffic management","Visser, H.G.","","1994","","Trajectory optimization; air traffic management; guidance","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:74716232-591c-4928-a83e-6737e8288fd0","http://resolver.tudelft.nl/uuid:74716232-591c-4928-a83e-6737e8288fd0","Nd3+ and Pr3+ doped inorganic scintillators","van Eijk, C.W.E.; Dorenbos, P.; Visser, R.","","1994","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:51e6b435-2b17-4696-b267-12a2f842bd76","http://resolver.tudelft.nl/uuid:51e6b435-2b17-4696-b267-12a2f842bd76","Bresgroei - deel I: Mathematisch model. Band A: Opzet en eerste resultaten. Band B: Inventarisatie sedimenttransport-formuleringen","Steetzel, H.J.; Visser, P.J.","Rijkswaterstaat","1994","In het kader van het in ontwikkeling zijnde mathematische model voor bresgroei zijn de bruikbare sedimenttransportformuleringen geëvalueerd.","rekenmodellen; computational models; dijkbeschadiging; dike damage; uitstroming; outflow; inundatie; inundation; sedimenttransportmodellen; sediment transport models; bresgroei; dune breach","nl","report","Deltares (WL)","","","","","","","","","","","","TAW/ENW",""
"uuid:1ed6821d-4be1-4893-817c-c13140c28cb1","http://resolver.tudelft.nl/uuid:1ed6821d-4be1-4893-817c-c13140c28cb1","Application of sediment transport formulae to sand-dike breach erosion","Visser, P.J.","","1994","The Technical Advisory Committee on Water Defences in the Netherlands has decided to develop a mathematical model for breach erosion in dunes and dikes, with which it will be possible to predict the growth of the breach and the discharge rate through the breach in case of a dike-burst. An essential part of such a mathematical model is the description of the entrainment of the sediment (sand or clay) and its transport through the breach. The process of breach erosion, especially in the first phases, is characterized by relatively steep slopes and large flow velocities. None of the existing sediment transport formulae has been derived and tested for these circumstances. This report presents the results of an investigation into the applicability of sediment transport formulae to sand-dike breach erosion. In view of the steep slopes and the large flow velocities, the following sediment transport conceptions have been included in the study: formulae for sand-water mixture flows: Wilson (1966), Wilson (1987), Mastbergen and Winterwerp (1987); formulae for sediment transport in flows on relatively steep slopes: Mizuyama (1977), Smart and Jaeggi (1983), Bathurst et al. (1987), Takahashi (1987), Rickenmann (1991); formulae for river regimes which have been tested for (relatively) large flow velocities (large shear stress velocities): Engelund and Hansen (1967), Van Rijn (1984a, 1984c); energetics-based sediment transport conceptions: Bagnold (1963, 1966), Yang (1979), Bagnold-Bailard, see Bailard (1981), Bagnold-Visser, see Visser (1988), these last two formulae are modifications of the original conception of Bagnold (1963, 1966); formulae for debris flows: Takahashi (1978, 1980, 1987, 1991). These sediment transport formulae, combined with Galappatti's model (1983) for the pickup of sediment, are compared with the data of two laboratory experiments (Schelde Flume experiments, see Steetzel and Visser, 1992a, 1992b) and the data of a field experiment (Zwin'89 experiment, see Visser et al., 1990). Experimental sediment transport rates have been determined as volumes of sand eroded over a certain period of time. All tests concern super-critical flow (Froude number Fr > 1, i.e. here 2.8<5 Fr<5 4.1), large values for Shields' mobility parameter (10 < theta < 100) and high concentrations (depth-averaged values rising up to about 0.25 by volume). Most of the tested sediment transport formulae predict sand transport rates being much larger than the observed quantities. Only the Bagnold-Visser formula, see Visser (1988), predicts sand transport rates within a factor two of the experimental values. With the formulation of Van Rijn (1984a, 1984c) this is possible within about a factor three. All other formulae give larger deviations from the experimental data. These conclusions hold for the three initial phases of the process of breach erosion, when the flow is supercritical, and confirm the good results obtained up to now with the BagnoldVisser formula, see Visser (1988, 1994). Once more it should be emphasized that this formula has not been derived for a situation where the rate of sand entrainment is so large as in the first three phases of the breach erosion process (this applies to both the energeticsbased method and the semi-empirical determination of the efficiency factor). The relatively large entrainment of sediment causes a relatively large increase of both the flow rate and the sediment concentration of the sand-water mixture along the inner slope (so that the effect of 'hindered entrainment' is possibly not negligible). Further study is necessary to establish the effects of the large rate of sediment entrainment on the breach erosion process. For the time being it is recommended to apply the formula of Bagnold-Visser in a mathematical breach growth model for the description of the first phases (i.e. as long as the flow is supercritical) of the breach erosion process. The present study does not recommend a formula for the important later phases of breach growth (when the flows becomes subcritical), in which most of the breach erosion takes place and in which also the dimensions of the ultimate breach are determined. Probably the data of the recent Zwin'94 field experiment (see Visser et al, 1995) will allow such a recommendation in the near future. For the present the conclusion of Voogt et al. (1991) is still valid, i.e. that the formulae of Engelund and Hansen (1967) and in particular Van Rijn (1984a, 1984c) can also be applied for relatively large current velocities in subcritical flow.","breach; dikes","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:103c2e66-ec4f-4a7e-ab6b-f5e5727d66c3","http://resolver.tudelft.nl/uuid:103c2e66-ec4f-4a7e-ab6b-f5e5727d66c3","Energy Transfer in Fluoride Scintillators","Visser, R.","van Eijk, C.W.E. (promotor)","1993","","","en","doctoral thesis","Delft University Press","","","","","","","","Applied Sciences","","","","",""
"uuid:dd740e8a-34ad-4ad4-88d4-c40a60eaf7e1","http://resolver.tudelft.nl/uuid:dd740e8a-34ad-4ad4-88d4-c40a60eaf7e1","""Space for the user"": DUC in the Netherlands","Visser, F.B.; Brouwer, M.P.A.M.; Kuijpers, E.A.","","1993","As a result of the ESA-USO study, the Netherlands initiated the development of a Dutch National User Support Organisation in 1989. In the past years the development went forward, involving Dutch industries, Dutch users, Dutch national agencies and the National Aerospace Laboratory NLR, The Netherlands. The latter acting as manager and coordinator of all Dutch support development activities. This paper provides a short overview of the current status of development of the Dutch User Support Organisation (DUSO) and its associated support centre DUC (Dutch Utilisation Centre). In detail some major achievements and future prospects in the fields of user support and telescience will be discussed.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:04462b37-7058-4cb5-8f29-760829075253","http://resolver.tudelft.nl/uuid:04462b37-7058-4cb5-8f29-760829075253","Preparation and demonstration of a support technology concept for in-orbit payload operations","Pronk, C.N.A.; Visser, F.B.; Sijmonsma, R.M.M.","","1993","Within the studies on Advanced Man-Machine Interfaces and Crew Support (AMMI&CS), being part of the Crew Workstation Testbed activities at ESTEC, a Dutch consortium is preparing the implementation of the User Support Organisation (USO) concept in a ground-based mission simulation. The objective of the Implementation study is to demonstrate and validate the USO concept mainly concerning operational organisation. The flight element is Pressurized Module (APM) ground-based support facilities are located at the Dutch Utilisation Centre (DUC/NLR, Noordoostpolder). The use of similarity in user interfaces and support functionalities between ground and flight segment is emphasized. The cooperation between Crew, Principal Investigator and Facility Expert is a particular subject of the study, since all of them will be on different locations. The present concept to be implemented is based on the use of common user interfaces and functions for both ground and flight segment.","Columbus; user support; mission simulation; utilisation centre; user interfaces","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:4736741b-fd5d-449f-a941-9e1d9e9117fd","http://resolver.tudelft.nl/uuid:4736741b-fd5d-449f-a941-9e1d9e9117fd","Scintillation properties of some Ce3+ and Pr3+ doped inorganic crystals","Dorenbos, P.; Visser, R.; van Eijk, C.W.E.; Khaidukov, N.M.; Korzhik, M.V.","","1993","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:8c1ad33e-69aa-471f-b2d8-329d22eb0bc4","http://resolver.tudelft.nl/uuid:8c1ad33e-69aa-471f-b2d8-329d22eb0bc4","An optimal control analysis of variable speed interception in a horizontal plane","Visser, H.G.; Shinar, J.","","1993","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:c40e5c16-7bf2-4641-84d9-1764a0d3f01c","http://resolver.tudelft.nl/uuid:c40e5c16-7bf2-4641-84d9-1764a0d3f01c","Absolute light yield measurements on BaF2 crystals and the quantum efficiency of several photomultiplier tubes","Dorenbos, P.; de Haas, J.T.M.; Visser, R.; van Eijk, C.W.E.; Hollander, R.W.","","1993","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:82622714-8499-4fb8-b9a4-e7696eea3afb","http://resolver.tudelft.nl/uuid:82622714-8499-4fb8-b9a4-e7696eea3afb","Studie naar de mathematische modellering van een schokdemper","Visser, D.W.","","1993","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:957b041a-8e2c-4ad7-be73-214c0727df01","http://resolver.tudelft.nl/uuid:957b041a-8e2c-4ad7-be73-214c0727df01","The use of satellites in gravity field determination and model adjustment","Visser, P.N.A.M.","Wakker, K.F. (promotor)","1992","","","en","doctoral thesis","Delft University Press","","","","","","","","Aerospace Engineering","","","","",""
"uuid:59ea3d6c-24b8-4bd4-af68-4137c782ecfa","http://resolver.tudelft.nl/uuid:59ea3d6c-24b8-4bd4-af68-4137c782ecfa","Bresgroei - Deel II: 2DV-ontwikkeling initiële bres","Steetzel, H.J.; Visser, P.J.","Rijkswaterstaat","1992","In het kader van het meerjarig onderzoek naar bresgroei is in dit verslag de vertikale ontwikkeling van een initiële bres beschreven aan de hand van de resultaten van een modelonderzoek.","dike breach; dune breach","nl","report","Deltares (WL)","","","","","","","","","","","","TAW/ENW",""
"uuid:2f6cb3b6-8f9d-4d90-b31c-01b81e6f85ab","http://resolver.tudelft.nl/uuid:2f6cb3b6-8f9d-4d90-b31c-01b81e6f85ab","A remote user support pilot experiment for Anthrorack during spacelab D-2","Kuijpers, E.A.; Visser, F.B.; Padeken, D.; Weber, T.; Karemaker, J.M.; Stok, W.J.","","1992","During the D-2 mission an opportunity exists to execute a pilot experiment concerning distributed scientific user support for Anthrorack. A Dutch scientist will act as co-Investigator at GSOC and will get remote support from another scientist at NLR Noordoostpolder. Also, various operations are required during preparation and post-processing which may be executed remotely.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:460b1d24-4d0d-40d6-ba19-179d997e2b68","http://resolver.tudelft.nl/uuid:460b1d24-4d0d-40d6-ba19-179d997e2b68","Dutch user support organization concept description and user requirements document","Visser, F.B.","","1992","It is expected that the number of micro-gravity research opportunities will strongly increase in the coming years. To improve the accessibility of these present and future opportunities for the users, ESA initiated activities that led to the definition of a User Support Organization (USO). This concept is described. The concept recognizes a European part (E-USO) and national parts (N-USOs). Anticipating on the implementation of an N-USO in the Netherlands, a scenario for this is presented. An appendix lists user requirements to be considered for a Dutch User Support Organization.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:ab1d9c43-63b1-4600-9305-3dc5644acc2a","http://resolver.tudelft.nl/uuid:ab1d9c43-63b1-4600-9305-3dc5644acc2a","Photon yields and decay times of cross luminescence in ionic crystals","Dorenbos, P.; Visser, R.; van Eijk, C.W.E.; Valbis, J.; Khaidukov, N.M.","","1992","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:aa8c4545-19fc-4ab6-9c5a-0a08c9768697","http://resolver.tudelft.nl/uuid:aa8c4545-19fc-4ab6-9c5a-0a08c9768697","Optimal lateral escape maneuvers for microburst encounters during final approach","Visser, H.G.","","1992","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:3af1e3cc-2729-48cf-8c13-5d7dbd982ef5","http://resolver.tudelft.nl/uuid:3af1e3cc-2729-48cf-8c13-5d7dbd982ef5","Toltunnels in de Randstad","Visser, J.G.S.N.","","1992","","toltunnels; Randstad Holland","nl","book","Delft University Press","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:d484568c-ad77-47b9-8c60-488fddda6a1f","http://resolver.tudelft.nl/uuid:d484568c-ad77-47b9-8c60-488fddda6a1f","Terminal area traffic management","Visser, H.G.","","1992","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:6499104e-884e-467b-ac03-166030a5be12","http://resolver.tudelft.nl/uuid:6499104e-884e-467b-ac03-166030a5be12","Effectiviteit van het beleid inzake stedelijk goederenverkeer: Toetsingsmethode voor het stadsdistributiecentrumconcept","Visser, J.G.S.N.","","1991","","Nederland; goederendistributie; goederenvervoer; ruimtelijke ordening","nl","book","Delftse Universitaire Pers","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:1268c1ea-c7ae-4117-bc84-ad2244916691","http://resolver.tudelft.nl/uuid:1268c1ea-c7ae-4117-bc84-ad2244916691","De hoge-snelheidslijn in de randstad; beleid en besluitvorming omtrent een grootschalig infrastructuurproject","Visser, J.G.S.N.; Bentvelsen, T.G.M.","","1991","De ontwikkeling van een Europees stelsel van hogesnelheidsspoorverbindingen lijkt om meer dan een reden een onafwendbare ontwikkeling. In verschillende landen worden met hoge snelheid hoge-snelheidsverbindingen per spoor gerealiseerd. Het totstandkomen van een Europees netwerk door middel van grensoverschrijdende verbindingen wordt door de Europese Gemeenschap noodzakelijk geacht Het ondersteunt immers de Europese gedachte, Europa 1992. In deze studie is slechts een van de hogesnelheidsverbindingen beschouwd, namelijk de verbinding Paijs - Brussel - Amsterdam en in het bijzonder het Randstedelijk deel van de verbinding. Het beleidsproces is tot oktober 1991 op zijn merites bekeken. De studie richtte zich met name op het verloop van het besluitvormingsproces rond de hoge-snelheidsspoorlijn (HSL), de wijze waarop besluitvorming en beleidsontwikkeling zijn verweven, de mate waarin het beleidsproces voldoet aan de beleidsanalytische benadering, in hoeverre de aanleg van de HSL nog aansluit bij het huidige beleid ten aanzien van verkeer en vervoer, ruimtelijke ordening en milieu, welke doorwerkingseffecten optreden en wie er uiteindelijk tot de winnaars en de verliezers kunnen worden gerekend. Ten tijde van het onderzoek was de besluitvorming omtrent de hoge-snelheidslijn nog in volle gang. In principe kan het onderzoek daarom niet als afgerond worden beschouwd. Aangezien de besluitvorming omtrent de hoge-snelheiäslijn in een belangrijke fase is gekomen, namelijk de advisering, leek het ons van belang te rapporteren omtrent onze bevindingen.","Randstad Holland; hogesnelheidsspoor; infrastructuur; ruimtelijke ordening","en","book","Delftse Universitaire Pers","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:951e9313-48cc-4951-8348-0c5bdf24fca2","http://resolver.tudelft.nl/uuid:951e9313-48cc-4951-8348-0c5bdf24fca2","Mathematical modelling of swirling pulverised coal flames","Visser, B.M.","Hoogendoorn, C.J. (promotor)","1991","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:b7735b57-e44c-47f6-98e2-04098454cbae","http://resolver.tudelft.nl/uuid:b7735b57-e44c-47f6-98e2-04098454cbae","Hogbomite in sappherine-bearing rocks from the Bamble Sector, south Norway","Visser, D.; Thijssen, P.M.H","","1991","Hogbomite is reported from two upper-amphibolite and granulite-facies, sapphirine-bearing, Al-Mg-Fe-rich and silica-poor lens-shaped layers within the Bamble Sector, south Norway. Primary assemblages, indicating peak metamorphic conditions of 773-844 °C at 7 kbar (Mg-Fe exchange thermometry), are spinel-sapphirine-biotite-gedrite, spinel-corudum-sapphirine-cordierite and orthopyroxene-biotite-cordierite-plagioclase. Hogbomite formed by hydrousalteration and oxidation of primary spinel and rutile and/or ilmenite according to the generalised reaction: spinel + ilmenite/rutile ± sapphirine ± gedrite + H2O + O2 = hogbomite ± corundum ± magnetic ± chlorite. Suggested conditions of hogbomite formation are 550-620 °C and 6-7 kbar. The hogbomites contain 10.2-14.7 wt.% MgO, 0-0.3 wt. % ZnO , 58.9-62.1 wt.% Al2O3 and 15.6-17.6 wt. % Fe as FeO. The two hogbomites may belong to different polytypes, as suggested by their differing TiO2 (9.9-10.1 versus 5.7- 5.8 wt.%) and calculated Fe3+ - and H2O-contents. The partitioning of Zn between spinel and hogbomite is not uniform and is considered to depend upon prevailing fO2 and aH2O.","","en","report","Utrecht University","","","","","","","","","","","","Molengraaff Fonds",""
"uuid:9a0e7934-6275-433e-ae2e-3c2cb157bd15","http://resolver.tudelft.nl/uuid:9a0e7934-6275-433e-ae2e-3c2cb157bd15","Scintillation properties of Ce3+ doped BaF2 crystals","Visser, R.; Dorenbos, P.; van Eijk, C.W.E.; Hollander, R.W.; Schotanus, P.","","1991","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:5ae08360-12ca-4958-a813-36f5548510f5","http://resolver.tudelft.nl/uuid:5ae08360-12ca-4958-a813-36f5548510f5","Ontwerpnota Stormvloedkering Oosterschelde, Boek 2: De waterbouwkundige werken","Visser, T.","Rijkswaterstaat","1991","Het ontwerp van onderdelen van het project Stormvloedkering wordt in 10 afzonderlijke deelnota's behandeld, wat aangeduid wordt met de term waterbouwkundige werken. Hieronder worden die onderdelen verstaan die in hoofdzaak uit grond en steenachtige materialen zijn opgebouwd. Bevat achtereenvolgens : deelnota 1 : algemene beschouwingen ; deelnota 2 : havens ; deelnota 3 : waterkeringen ; deelnota 4 : wegen en aansluitingen ; deelnota 5 : grondverbetering en verdichting funderingsbed ; deelnota 6 : funderingsbed ; deelnota 7 : drempel en overgangsconstructie ; deelnota 8 : breukstenen dammen ; deelnota 9 : bodembescherming ; deelnota 10 : damaanzetten.","stormvloedkering; Oosterschelde; Deltawerken","nl","report","Rijkswaterstaat, Deltadienst","","","","","","","","","","","","Deltawerken, Oosterschelde",""
"uuid:ec9c3af3-d16f-4994-906b-18dded979088","http://resolver.tudelft.nl/uuid:ec9c3af3-d16f-4994-906b-18dded979088","Sapphirine-cordierite-bearing metasediments at Gladstad, South of Tvedestrand","Thijssen, P.H.M.; Visser, D.","","1991","","","en","report","Utrecht University","","","","","","","","","","","","Molengraaff Fonds",""
"uuid:40e0c4aa-277f-40fb-b23b-f92150d98fd7","http://resolver.tudelft.nl/uuid:40e0c4aa-277f-40fb-b23b-f92150d98fd7","Historische stedenatlas van Nederland. Afl. 5. Schoonhoven en Nieuwpoort","Visser, J.C.; Elsing, T.M.; Henderikx, P.A.; Wegner, J.G.","","1990","","Nederland; historische geografie; kaarten; stadsgeschiedenis","nl","book","Delftse Universitaire Pers","","","","","","","","","","","","",""
"uuid:9c01c01b-fb58-46b9-b561-755ac05176fa","http://resolver.tudelft.nl/uuid:9c01c01b-fb58-46b9-b561-755ac05176fa","Missing links in Europees verband: Technische standaardisatie","Konings, R.; Louw, E.; Visser, J.","","1990","","standaardisatie","en","book","Delftse Universitaire Pers","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:bc38dfda-1244-4611-8d08-458ea9759db0","http://resolver.tudelft.nl/uuid:bc38dfda-1244-4611-8d08-458ea9759db0","Oxygen requirements of yeasts","Visser, W.; Scheffers, W.A.; Batenburg-van der Vegte, W.H.; van Dijken, J.P.","","1990","","","en","journal article","American Society for Microbiology","","","","","","","","Applied Sciences","","","","",""
"uuid:a12df913-26e4-4864-a084-ed171cebd924","http://resolver.tudelft.nl/uuid:a12df913-26e4-4864-a084-ed171cebd924","Synthesis and validation of feedback guidance laws for air-to-air interceptions","Shinar, J.; Visser, H.G.","","1990","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:f5ad28a5-5efe-428b-a2cf-b90c533bcc8f","http://resolver.tudelft.nl/uuid:f5ad28a5-5efe-428b-a2cf-b90c533bcc8f","A field experiment on beach growth in sand-dikes","Visser, P.J.; Vrijling, J.K.; Verhagen, H.J.","","1990","The set-up and results of a field experiment on sand-dike breach erosion are described, It is found that the breaching process for the 2.2 m high sand-dike is similar to that in Visser's (1988) laboratory experiments with a 0.6 m high sand-dike. Confrontation of Visser's (1988) breach erosion model with the field data shows reasonable agreement for the first stages of the breaching process. As yet the model is not applicable to the final phase of the sand-dike breach erosion. If applied then it would fairly overestimate the breach growth in this final stage.","breaching; dikes; erosion","en","conference paper","American Society for Civil Engineers ASCE","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:6d3ecba5-540b-47a0-948e-af1e385d68ca","http://resolver.tudelft.nl/uuid:6d3ecba5-540b-47a0-948e-af1e385d68ca","Surface acoustic wave filters in ZnO-Si02-si layered structures; Design, technology, and monolithic integration with electronic circuitry","Visser, J.H.","Middelhoek, S. (promotor); Venema, A. (promotor)","1989","","","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:8b1fa319-64c7-477f-bb52-02b974bc9db5","http://resolver.tudelft.nl/uuid:8b1fa319-64c7-477f-bb52-02b974bc9db5","First order weight corrections for real-time flight path management","Visser, H.G.","","1989","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:58d01125-998d-4f95-8a58-371c00ee893f","http://resolver.tudelft.nl/uuid:58d01125-998d-4f95-8a58-371c00ee893f","An approach to on-board optimization of cruise at constant altitude","Visser, H.G.","","1989","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:b7f1374a-aefa-47ea-a2ef-ee40ec666bbf","http://resolver.tudelft.nl/uuid:b7f1374a-aefa-47ea-a2ef-ee40ec666bbf","Ontwerpnota Stormvloedkering Oosterschelde, Boek 3: De betonwerken","Visser, T.","Rijkswaterstaat","1989","Het boek bevat een zo compleet mogelijke beschrijving van de gang van zaken die geleid heeft tot het tot stand komen van de betonnen onderdelen van de stormvloedkering. De betonnen onderdelen zijn: Deelnota 1: Algemene aspecten; Deelnota 2: Pijlers; Deelnota 3: Landhoofden; Deelnota 4: Dorpelbalken; Deelnota 5: Bovenbalken; Deelnota 6: Verkeerskokers; Deelnota 7: Hamerstukken; Deelnota 8: Het bedieningsgebouw; Deelnota 9: De Roompotsluis; Deelnota 10: de kleine kunstwerken.","Oosterschelde; stormvloedkering; Pijlerdam; Topshuis","nl","report","Rijkswaterstaat, Deltadienst","","","","","","","","","","","","Deltawerken, Oosterschelde",""
"uuid:b37c033e-e345-43e6-8243-5fab5a5bc27c","http://resolver.tudelft.nl/uuid:b37c033e-e345-43e6-8243-5fab5a5bc27c","Kostenvergelijking van bedrijventerreinontwikkeling binnen en buiten de stad: Herstructurering of aanleg van een nieuw bedrijventerrein","Visser, J.G.","","1988","","gebouwen voor administratie en handel; ondernemingsstrategie; grondbeleid en onroerend goed","nl","book","Delftse Universitaire Pers","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:de98ed1b-f67a-42ed-8f67-eef7c2d4d4e8","http://resolver.tudelft.nl/uuid:de98ed1b-f67a-42ed-8f67-eef7c2d4d4e8","Guidelines for the Man-Machine Interface design of the crew workstation in Columbus","Visser, F.B.","","1988","In the future Columbus in-space facility, the communication between the crew and the various system elements will mainly take place via the so called Crew Workstation (CWS). The CWS hardware will comprise a versatile set of I/O devices which enable the clear and unequivocal presentation of information to, and the easy issue of commands by crew members. It is obvious that the fact that a multitude of applications communicates with the crew using one and the same workstation will impose a large burden upon the performance of the Man-Machine Interface (MMI) defined in the workstation. This report gives an overview of possible pitfalls that can occur and guidelines that can be used during the definition of the MMI of the Crew Workstation. As the CWS operating system will enable the use of multiple windows on the same display screen, special attention will be paid to MMI aspects of multi window environments.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:71cb291a-8d25-4ee2-9ce1-8740a777b802","http://resolver.tudelft.nl/uuid:71cb291a-8d25-4ee2-9ce1-8740a777b802","Production, Distribution, and Kinetic Properties of Inulinase in Continuous Cultures of Kluyveromyces marxianus CBS 6556","Rouwenhorst, R.J.; Visser, L.E.; Van Der Baan, A.A.; Scheffers, W.A.; Van Dijken, J.P.","","1988","","","en","journal article","American Society for Microbiology","","","","","","","","Applied Sciences","","","","",""
"uuid:59b1d897-aa27-4fdf-a782-3a92b2cf2408","http://resolver.tudelft.nl/uuid:59b1d897-aa27-4fdf-a782-3a92b2cf2408","Hermes communications using data relay satellites. Part 5. Optical communication system for the Hermes space plane","Visser, F.B.","","1988","This report contains the results of the study concerning the applicability of a system required to establish and maintain an optical communication link between a geostationary European Data Relay Satellite and a user in a low earth orbit (HERMES). The optical terminal on both spacecraft consists of elements that will enable acquisition and maintenance of the optical connection and elements that will receive and decode the messages transmitted on the link. In this report most attention is paid to the first group of elements and a system concept is described. The usage of the optical link is divided in three phases: the acquisition phase, in which the required connection is established; the tracking phase, during which the optical connection is available and maintained by active control of the beam pointing direction; the acquisition phase, which is used when during the tracking phase a loss of signal occurs. Specific problems, induced by the HERMES spaceplane, are indicated.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:80f4218a-cac7-4c8a-ae5f-853ba2bea25c","http://resolver.tudelft.nl/uuid:80f4218a-cac7-4c8a-ae5f-853ba2bea25c","Acoustic measurements on real and synthetic reservoir rock","Visser, R.","Van der Vuurst de Vries, J.J. (promotor); Ziolkowski, A.M. (promotor)","1988","","aardoliereservoirgesteente; petrofysica","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:29c01ddc-6962-4a3f-bf8e-f477fa93ddac","http://resolver.tudelft.nl/uuid:29c01ddc-6962-4a3f-bf8e-f477fa93ddac","Een studie voor de Suiker Unie naar verschillende suikerbietenpulpdrogers","Bergman, E.; Coremans, P.; Favier, M.; Grootes, B.J.; Hooijkaas, M.; Huisman, J.R.; Jansens, P.; Schuring, R.J.; Touw, B.; Venderbosch, R.; Visser, L.; Waalewijn, E.","","1988","Document uit de collectie Chemische Procestechnologie","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:5919b100-86e9-4866-92b3-4daab34af320","http://resolver.tudelft.nl/uuid:5919b100-86e9-4866-92b3-4daab34af320","Aluminous reaction textures in orthoamphibol-bearing rocks; the pressure-temperature evolution of the high-grade Proterozoic of the Bamble sector, south Norway","Visser, D.; Senior, A.","","1988","","","en","report","Utrecht University","","","","","","","","","","","","Molengraaff Fonds",""
"uuid:aa2da6c5-5b86-4312-83f6-0339c9c0c274","http://resolver.tudelft.nl/uuid:aa2da6c5-5b86-4312-83f6-0339c9c0c274","PROCRU simulation results compared with Metro II in-flight ILS approach data","Visser, J.","","1987","The PROCRU (Procedure Oriented Crew) model has been developed for the analysis and modeling of flight crew procedures during an ILS approach. The model's specific capability concerns the generation of ""timelines"" of the necessary actions to be carried out by each crew member during the approach. Besides, also the corresponding timelines for other relevant variables can be generated by the model reflecting among other things the aircraft's position relative to the runway, its altitude, speed, information presented, etcetera. The objective of the present study is to analyse the model's applicability by comparing model results with actual in-flight approach data. The approaches have been flown with the Swearingen Metro II research aircraft of NLR. More specifically, they were carried out as an additional part of another, simultaneously running, research project. Although the in-flight experiment was not explicitly designed for the purpose of model validation, the obtained data allowed useful comparisons with PROCRU generated data. The model results show an acceptable degree of accuracy, with respect to the prediction of timelines of the relevant events in the approach, as well as with respect to the computed flight path profiles. The study also reveals a number of weaknesses In the model which are inherently related to aspects of the model implementation in the computer program. Some specific recommendations for additional model improvements are formulated, in particular, in relation to practical aspects enhancing the flexibility of the utilization of th PROCRU model.","Computerized simulation; Aircraft landing; Manual control; Approach control; Crew procedures (inflight); Instrument landing systems; Tasks; Decision making; Mathematical models; Computer programs","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:d5da0846-5c3d-41c5-b9cf-14b338b69783","http://resolver.tudelft.nl/uuid:d5da0846-5c3d-41c5-b9cf-14b338b69783","De produktie van aceton uit isopropylalkohol m.b.v. katalytische dehydrogenering","Rakels, H.; Visser, M.","","1987","Document(en) uit de collectie Chemische Procestechnologie.","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:7efd6e58-5bc7-47c0-a228-ee2d7802685f","http://resolver.tudelft.nl/uuid:7efd6e58-5bc7-47c0-a228-ee2d7802685f","Wind weren: Stedebouwkundige maatregelen","De Jong, T.M.; Vermeulen, P.; Visser, G.Th.","","1987","Monografieën milieuplanning/SOM","","nl","book","Delft University Press","","","","","","","","Delft University of Technology","","","","",""
"uuid:9d05d612-aa18-42c6-b8e6-16e2e828579f","http://resolver.tudelft.nl/uuid:9d05d612-aa18-42c6-b8e6-16e2e828579f","Optical mass storage space qualification study. Part I. Final report and executive summary","Joosten, L.J.M.; Smilde, H.; Sijmonsma, R.M.M.; Visser, F.B.; Reesink, W.E.; van Tijn, R.","","1987","This study -under contract with ESA/ESTEC- concerns the feasibility of upgrading commercially optical mass storage equipment. It addresses the environmental conditions expected in Columbus, and the verification procedures (Part II). From the optical storage devices Philips is involved in, the CD-ROM-CM200 serie is selected as a promising space-borne candidate. Space-qualification seems feasible, though several VLSI components, the basic drive and the disc storage medium have to be qualified without redesign them (Part III). The study gives an overview of the available ground support, and indicates the use in manned space missions (Part IV) . It deals briefly with the use of optical mass storage in unmanned missions.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:bbaa687f-cdf9-4b9d-83a4-c2db9f6b7c01","http://resolver.tudelft.nl/uuid:bbaa687f-cdf9-4b9d-83a4-c2db9f6b7c01","Optical data storage in space missions","Joosten, L.J.M.; Sijmonsma, R.M.M.; Visser, F.B.; Reesink, W.E.","","1987","Optical mass storage of digital data is attractive for use in space missions. This is the result of an ESA/ESTEC study performed by the Dutch National Aerospace Laboratory and Van der Heem Electronics (Signaal/Philips). Upgrading of commercial devices seems feasible, while ground support can be done by common equipment and software. In this way the benefits of optical storage become available for space missions. Paper presented at the Symposium on Technology and Standardisation for On-Board Data Management Systems, 1-5 June 1987, Madrid, Spain.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:bacc78ad-eb62-4fa3-9a97-1c55e4c2dc16","http://resolver.tudelft.nl/uuid:bacc78ad-eb62-4fa3-9a97-1c55e4c2dc16","A preliminary study of a fluid science laboratory for space station (Columbus). Final report. Part 4. Executive summary","da Riva, I.; Martinez, I.; Martinez-Val, R.; Sanz, A.; Huijser, R.H.; Visser, F.B.; Vreeburg, J.P.B.","","1987","The report presents a design study, within a specified envelope of resources, of laboratory for scientific research on fluid material in a space station, A survey of the scientific background of mlcrogravity experiments identifies candidate investigations. A structured description of available facilities, or earlier design studies, provides a background of engineering possibilities and data. Based on the supporting material on requirements, achievable engineering and feasible operations, a preliminary design concept of a Fluid Science Laboratory is outlined. Recommendations for additional studies, and conclusions are formulated","Mlcrogravlty experiments; Space stations; Spaceborne experiments; Optical measuring Instruments; Flow visualization; Weightless fluids; Requirements; Test facilities; Columbus","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:f0cfdaf0-dd5c-401a-8b9a-9882a967f56e","http://resolver.tudelft.nl/uuid:f0cfdaf0-dd5c-401a-8b9a-9882a967f56e","A preliminary study of a fluid science laboratory for spacestation (Colombus). Final report. Part 3. Descriptors of an operational FSL in Columbus","da Riva, I.; Martinez, I.; Martinez-Val, R.; Sanz, A.; Huijsen, R.H.; Visser, F.B.; Vreeburg, J.P.B.","","1987","Based on earlier designs for fluid science facilities, the elements of a FSL are derived. They have been grouped in classes, viz. experiment volumes and support elements. Each is described qualitatively, i.e. their features and required performances are discussed. The experiments are to be described with reference to a set of (5) canonical measurement problems. Among them, most, if not all, diagnostic and conditioning problems are represented. The operations scenario of typical fluid science experiments in a space station is discussed. Special attention is given to the data flows in telescience architecture, and to onboard housekeeping and waste management problems.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:b801eec3-f338-4024-a03f-4d46751d035f","http://resolver.tudelft.nl/uuid:b801eec3-f338-4024-a03f-4d46751d035f","A preliminary study of a fluid science laboratory for spacestation (Colombus). Final report. Part 2. Survey of equipment and hardware items","Martinez, I.; da Riva, I.; Martinez-Val, R.; Vreeburg, J.P.B.; Sanz, A.; Huijser, R.H.; Visser, F.B.","","1987","The present part 2 of the Final Report presents an inventory of techniques that are likely to find application in the Fluid Science Laboratory. Part 1 of the Report contains a survey of the scientific disciplines that are indicated to provide investigations for the FSL. In the following Part 3, a preliminary synthesis of the content matter of the first two parts is presented, as a possible outline of an actual FSL. Some special attention has been given to the handling and diagnosis of fluids that are appreciably hotter than the 60 °C or so encountered in the Fluid Physics Module and other fluid science facilities. This effort reflects the growing demand for realtime field mapping techniques that can be used in opaque liquids such as metallic melts. The present lack of methods conveniently demarcates the nature of the FSL from that of a Metallurgy laboratory. Other differences exist between a FSL and related laboratories for combustion or life sciences research. Nevertheless, important commonalities exist in requirements and equipment for support, control and data handling. The results of earlier design studies for fluid science facilities have been compared and assessed. The scale of the FSL and the accommodation in a permanent space habitat imposes important additional design considerations, but earlier diagnosis and conditioning techniques are instructive. However, it is to be noted that the accuracy requirements for FSL experiments can be expected to be much tighter than for earlier investigations","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:cb9c869d-c2fa-4163-8a4c-d08275ee0939","http://resolver.tudelft.nl/uuid:cb9c869d-c2fa-4163-8a4c-d08275ee0939","Ontwerp van het baggeren van het havenbassin en de vaargeul van de zeehaven van Kelantan","Visser, P.G.L.","","1987","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:4c4a1bfb-42f4-45e6-837f-38fde534fcdf","http://resolver.tudelft.nl/uuid:4c4a1bfb-42f4-45e6-837f-38fde534fcdf","Historische stedenatlas van Nederland. Aflevering 4. Kampen","Speet, B.J.M.; Van Herwijnen, G.; Van de Kieft, C.; Visser, J.C.; Wegner, J.G.","","1986","","Nederland; historische geografie; kaarten; stadsgeschiedenis","nl","book","Delftse Universitaire Pers","","","","","","","","","","","","",""
"uuid:0de6eceb-d260-4f12-8fe0-4faf56bae61f","http://resolver.tudelft.nl/uuid:0de6eceb-d260-4f12-8fe0-4faf56bae61f","Stormvloedkering Oosterschelde: Filterstabiliteit bij de overgang Noma-bovenmat : invloed van zandafzettingen","Visser, P.J.","Deltares","1986","","bed protection; block mattresses; blokkenmatten; bodemverdediging; Oosterschelde; Zeeland","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:ac245572-c4fd-4e94-acf8-dba5e86e032e","http://resolver.tudelft.nl/uuid:ac245572-c4fd-4e94-acf8-dba5e86e032e","Ontwikkeling stroomgat en debiet bij dijkdoorbraak","Visser, P.J.; Ribberink, J.S.; Kalkwijk, J.P.T.","","1986","Eén van de mogelijkheden voor het opslaan van energie is een bekken met een relatief hoge waterstand (Pomp Accumulatie Centrale). Het bekken is omringd met een dijk van zand, die vanwege de mogelijkheid van doorbreken een risico voor de aangrenzende gebieden betekent. Het maximale uitstroomdebiet bij dijkdoorbraak is een belangrijke grootheid bij het maatgevende faalmechanisme voor een PAC. Dit uitstroomdebiet wordt vooral bepaald door de groei van het stroomgat in de tijd. In dit rapport wordt een mathematisch model beschreven voor de groei van het stroomgat en het verloop van het uitstroomdebiet in de tijd na een initieel kleine bres. Er is uitgegaan van een dijk volledig opgebouwd uit zand, waarbij wordt verondersteld dat de taludbekledingen het erosieproces niet befnvloeden. Het model is quasi 3-dimensionaal: de bresgroei in breedterichting is gekoppeld aan die in de diepte. Voor de bepaling van het zandtransport is het concept van Bagnold [6] toegepast. Hierbij wordt het transport berekend door deze met efficiency-factoren te koppelen aan het beschikbare vermogen hiervoor. Het model is gebaseerd op het mechanisme van dijkdoorbraak als waargenomen in drie experimenten. Drie stadia in de dijkdoorbraak kunnen hierbij onderscheiden worden: I. versteiling van het buitentalud tot een zekere grenswaarde, II. kruinsverlaging met daaraan gekoppeld groei van de bres in de breedte, III. dijk t.p.v. het stroomgat is geheel verdwenen, voortgaande groei van het stroomgat in de breedte en in de diepte (ontgrondingskuil). In stadium II bepaalt het zandtransport aan de teen van het buitentalud de erosie van het gehele talud, dus ook de kruinsverlaging. Toetsing van het model is gedaan aan de resultaten van de drie schaalproeven. De overeenkomst tussen theoretisch model en de experimentele resultaten is zeer goed. Voor de prototype-situatie is met het model een groot aantal berekeningen uitgevoerd. Enerzijds is hierbij de gevoeligheid van met name het maximale debiet voor de diverse parameters onderzocht, d.w.z. voor de efficiency factor e van het suspensietransport, de breedte-diepte-verhouding r van het stroomgat, de Chèzy coëfficiënt, de helling van het buitentalud in stadium II en de afvoer-coëfficiënt. Anderzijds is de oppervlakte van en waterdiepte in het bekken gevarieerd. Het model is vooral gevoelig voor e en r. De efficiency factor e is hiervan de meest onzekere parameter. Dit is het gevolg van de noodzakelijke extrapolatie van de kennis omtrent de opname en het transport van zand bij stroomsnelheden van 1 à 2 m/s naar snelheden van orde grootte 20 m/s. Het theoretisch model voorspelt voor een bekken met een vaterdiepte van 70 m, een oppervlakte van 15 km2 en een dijkprofiel met helling buitentalud 1 : 4 en helling binnentalud 1 : 2.8, een maximaal debiet van 2.8 x 10^5 m3/s, optredend ongeveer 42 minuten na het begin van de dijkdoorbraak. Hierbij is de efficiency factor van Bagnold e = 0.01 toegepast. Een variatie van e met een factor 2 naar beneden en naar boven geeft een maximaal debiet van respectievelijk 2.0 x 10^5 en 4.0 x 10^5 m3/s, optredend respectievelijk ongeveer 60 en 30 minuten na het begin van de dijkdoorbraak.","stroomgat; dijkdoorbraak; uitstroomtdebiet; PAC; Pomp Accumulatie Centrale; mathematisch model","nl","report","TU Delft, Department of Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:eb301e00-9593-4673-9816-42d02c893a82","http://resolver.tudelft.nl/uuid:eb301e00-9593-4673-9816-42d02c893a82","System design study for an electronic document delivery system","Simons, H.J.; Joosten, L.J.M.; Visser, F.B.; Dijk, J.; Verlijsdonk, A.P.","","1986","The objectives of this study are to define the technical facilities which are required for electronic document delivery over a satellite link. In this report, the user requirements and system requirements are analysed for the complete chain of Electronic Document Delivery (EDD) facilities, consisting of archiving, transmission and reproduction systems. Several conceptual configurations are studied and a cost evaluation is presented.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:5a3641fa-5e7d-480c-b41c-2e9a531a21c1","http://resolver.tudelft.nl/uuid:5a3641fa-5e7d-480c-b41c-2e9a531a21c1","Architektonische studies 3","Van Duin, L.; Polak, M.; Visser, R.; Wilms Floet, W.","","1986","Studenteneditie (Dis)kontinuiteit van het moderne Nostalgisch Utopia? Het ordenen en verbeelden van architektuur Woongebieden en woongebouwen; de emotie in het ontwerp Fantasie of verbeelding","","nl","book","Delftse Universitaire Pers","","","","","","","","Architecture","Architecture","","","",""
"uuid:dda73a61-a199-4e6b-ad8c-6dd8a68bf147","http://resolver.tudelft.nl/uuid:dda73a61-a199-4e6b-ad8c-6dd8a68bf147","Ontwerpnota stormvloedkering Oosterschelde: Boek 1: Totaalontwerp en ontwerpfilosofie","Visser, T.","Rijkswaterstaat","1986","In deze nota over het ontwerp van de Stormvloedkering Oosterschelde wordt ingegaan op de randvoorwaarden voor de stormvloedkering, de ontwikkeling van het ontwerp en de organisatie van het project. De basisfilosofie en concept van het ontwerp, de functionele analyse, de veiligheidsanalyse, de ontwerpkeuze, prefabricage en normvastheidsproblematiek, het probabilisme in het ontwerpen en de landschapsvorming van de Oosterschelde en omgeving worden besproken. De grondmechanische-, morfologische -, hydraulische- en ecologische aspecten van het project komen aan de orde. Het tracé, de afsluitbare kering, de vaste kering en de secundaire werken worden beschreven. Het beheer (inclusief Beslissimulatiesysteem (BSS) en Noodsluitsysteem (NSS)), beveiliging en onderhoud van de stormvloedkering worden behandeld.","stormvloedkering; Oosterschelde; ontwerpuitgangspunten","nl","report","Rijkswaterstaat","","","","","","","","","","","","",""
"uuid:4d5ea237-62e4-436a-b948-002308346b2f","http://resolver.tudelft.nl/uuid:4d5ea237-62e4-436a-b948-002308346b2f","Continuous Culture Studies on the Regulation of Pqq-Dependent Glucose-Dehydrogenase in Acinetobacter-Calcoaceticus","Visser, W.; Van Schie, B.J.; De Bont, J.A.M.; Van Dijken, J.P.; Kuenen, J.G.","","1985","","","en","journal article","","","","","","","","","","","","","",""
"uuid:c25e705d-8db2-4966-bbee-7effed263d07","http://resolver.tudelft.nl/uuid:c25e705d-8db2-4966-bbee-7effed263d07","Architektonische studies 1","Van Duin, L.; De Jong, H.; Pennink, P.; Polak, M.; De Bruyn, E.; Visser, R.","","1985","Het ontwerp van woongebieden en woninggroeperingen, dr.ir. M. Polak (Dis)kontinuïteit van het moderne, ir. L. van Duin Ruimtevorm en beeld in enkele plannen van Loos, Wright en Soane, R. Visser","Woongebieden; Woningsgroeperingen","nl","book","Delftse Universitaire Pers","","","","","","","","Architecture","Architecture","","","",""
"uuid:e1b04945-6712-4aa8-897d-754e1cf9be84","http://resolver.tudelft.nl/uuid:e1b04945-6712-4aa8-897d-754e1cf9be84","Ontwerpnota stormvloedkering Oosterschelde: Boek 5: Hulpsystemen enhulpwerktuigen","Visser, T.","Rijkswaterstaat","1985","Het boek geeft een beschrijving van de bijzondere hulpmiddelen die gebruikt zijn bij de realisatie van de Stormvloedkering Oosterschelde. Deze systemen en werktuigen wijken af van de in de Nederlandse waterbouwkunde normaal gebruikelijke hulpmiddelen. Bevat achtereenvolgens : Inleiding en algemene probleemstelling; Hydro-meetsystemen; plaatsbepalingssystemen; peilingen en lodingen; onderwaterdetectie; grondmechanisch onderzoek onderwater; materieel grondverbetering; verdichtingsschip Mytilus; dustpanzuigers; blokkenmatten en tegelmatten; Jan Heijmans; funderingsmattenfabriek; funderingsmattenlegger Cardium; grindwiepenmattenlegger Sepia; afvier- en opschoonponton Macoma; hefschip Ostrea; taklift 4; toplaagstorter Trias","Oosterschelde; stormvloedkering; meetsystemen","nl","report","Rijkswaterstaat","","","","","","","","","","","","",""
"uuid:23de5a5a-6e16-4982-832c-b29de04ba935","http://resolver.tudelft.nl/uuid:23de5a5a-6e16-4982-832c-b29de04ba935","Architektonische studies 2","Van Duin, L.; De Jong, H.; Dawson, J.; Luthi, P.; Pennink, P.; De Bruyn, E.; Polak, M.; De Bruyn, E.; Visser, R.","","1985","Dit tweede nummer van 'Architektonische Studies' bevat een aantal artikelen rondom twee thema's: transparantie in de architektuur en het gebouw in de stad.","transparantie","nl","book","Delftse Universitaire Pers","","","","","","","","Architecture","Architecture","","","",""
"uuid:e9251492-4d58-4523-9cdd-6ba78eee4639","http://resolver.tudelft.nl/uuid:e9251492-4d58-4523-9cdd-6ba78eee4639","Veiligheid Duinenkust 1983","Rakhorst, H.D.; Roelse, P.; Verhagen, H.J.; Visser, W.; Nolte, R.; Dillingh, D.; Vellinga, P.","Rijkswaterstaat, adviesdienst Hoorn","1984","In de ""leidraad voor de beoordeling van de veiligheid van duinen als waterkering"" wordt aangegeven hoe aan de bij de Deltawet vastgestelde veiligheidsnormen de duinen als primaire waterkering moeten worden getoetst. De veiligheid van de Nederlandse duinenkust is op grond van de situatie in 1983 beoordeeld. Tevens is de bezwijkkans bepaald voor 1990, het jaar waarin de werken ""in 'het kader van de Deltawet worden afgesloten. Niet overal langs de Nederlandse kust blijken de duinen het achterland voldoende tegen overstroming te beschermen. Dit rapport geeft een overzicht van de veiligheid van de afzonderlijke duinsecties.","Zandige kust; Duinen","nl","report","Rijkswaterstaat, directie waterhuishouding en waterbeweging - district kust en zee - adviesdienst hoorn","","","","","","","","","","","","",""
"uuid:0ff7ee9d-8258-400a-b2e4-13549cc1a782","http://resolver.tudelft.nl/uuid:0ff7ee9d-8258-400a-b2e4-13549cc1a782","Taludbekleding van gezette steen. Fase 2: Verslag onderzoek","Visser, P.J. .; Taat, H.; Schoonman, H.B.","Kenter, C.J. (contributor); Rijkswaterstaat","1984","In de tweede helft van 1981 is door de Deltadienst van Rijkswaterstaat aan het Waterloopkundig Laboratorium en het Laboratorium voor Grondmechanica opdracht verleend voor een onderzoek naar de stabiliteit onder golfaanval van de teenkonstruktie en taludbekleding van de Oesterdam, damvak Marollegat. In het kader van deze opdracht is onder meer een grootschalige modelproef uitgevoerd in de Deltagoot. Dit model is konform de werkelijkheid opgebouwd uit de materialen die voor dit doel door de opdrachtgever ter beschikking worden gesteld. Naast de grootschalige proeven (Deltagoot) zijn ook kleinschalige proeven uitgevoerd (Scheldegoot). Uit beide modellen zijn voor de aanvang van de proeven representatieve materiaalmonsters getrokken waarvan de eigenschappen zijn bepaald, die voor de evaluatie van het modelonderzoek van belang zijn. Deze evaluatie en daarmee ook dit materiaalonderzoek valt onder fase 2 van het Fundamenteel Onderzoek ""Stabiliteit steenzettingen"". Kort na het onderzoek ten behoeve van de Oesterdam zijn in de Deltagoot nog een viertal grootschalige onderzoeken met taludbekledingen uitgevoerd.","talud; bekleding","nl","report","Deltares (WL/GD)","","","","","","","","","","","","Steenzettingen - TAW/ENW",""
"uuid:f2df2b1a-75c2-46b8-878e-1d2b8b953204","http://resolver.tudelft.nl/uuid:f2df2b1a-75c2-46b8-878e-1d2b8b953204","Rekenmodel voor extra duinafslag ten gevolge van een gradiënt in het langstransport als gevolg van een kromming van de kustlijn","Dilling, D.; Visser, C.","Rijkswaterstaat","1984","Om het toepassingsgebied van de leidraad duinafslag te vergroten wordt in deze notitie een afschatting gemaakt van een eventueel verlies aan zand ten gevolge van een kromming van de kustlijn. Dit verlies is het gevolg van een gradiënt in het langstransport tijdens een stormvloed. In het onderzoek naar de invloed van een gradiënt in het langstransport op de mate van duinafslag is in de eerste plaats getracht om door analyse van natuurraetingen tot een uitspraak te kunnen komen. Een onderzoek hiernaar door Kraayenbrink en Leeuwenstein [4] werd in 1980 afgerond. Dit onderzoek werd mede begeleid door de Adviesdienst Vlissingen van de Rijkswaterstaat. Hierbij werd getracht een verband te leggen tussen de veranderingen in zandvolumen in diverse raaien loodrecht op de kust en de opgetreden stormvloeden voor een aantal locaties waar sprake kon zijn van een mogelijke gradiënt-invloed. Uit dit onderzoek kwam naar. voren dat de kwaliteit van de beschikbare profielmetingen, alsmede de frequentie van uitvoering hiervan in feite de oorzaak waren, dat de invloed van een ""gradiënt"" op duinafslag kwalitatief noch kwantitatief vastgesteld kon worden.","duinafslag; langsgradiënt","nl","report","COW (Centrum Onderzoek Watekeringen)","","","","","","","","","","","","TAW/ENW",""
"uuid:648ad326-4c44-4646-ab73-559a118a8ab4","http://resolver.tudelft.nl/uuid:648ad326-4c44-4646-ab73-559a118a8ab4","A mathematical model of uniform longshore currents and the comparison with laboratory data","Visser, P.J.","","1984","This report describes a mathematical model for uniform longshore currents and laboratory experiments on these currents, as also the comparison of theory and experiment. The longshore driving force is modeled taking into account the physical fact that dissipation of wave energy takes place shoreward of the plunge instead of in the whole surf zone as usely assumed. The bottom friction is modeled by considering the combined orbital and mean current velocity vector. This is done in several manners since it is still unclear how to combine these velocities near the bqttom. The lateral friction is modeled according to Battjes (1975, 1983). The data obtained from the present longshore current experiments appear to be very usable to verify the theoretical results: the rate of accuracy of the measurement results is high, the longshore current profiles are uniform and these were measured in detail. The experimental results do not confirm the often made assumption of a logarithmic vertical velocity profile. The agreement between the longshore currents predicted by the mathematical model and the experiments is good and this has been achieved with realistic values of the bottom roughness.","longshore current; beach hydrodynamics; radiation stress","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:4abcb1b7-b8fc-405d-8f45-9a9ba6a93cea","http://resolver.tudelft.nl/uuid:4abcb1b7-b8fc-405d-8f45-9a9ba6a93cea","Ontwerpregels voor een tegenstrooms vloeistof-vloeistof extractiekolom gepakt met Sulzer statische mengelementen","Visser, E.M.","","1984","Document uit de collectie Chemische Procestechnologie","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:9c85c50f-9cfc-4848-b060-6773a74905d8","http://resolver.tudelft.nl/uuid:9c85c50f-9cfc-4848-b060-6773a74905d8","Historische stedenatlas van Nederland. Afl. 3. Zutfen","Doornink-Hoogenraad, M.M.; Van Herwijnen, G.; Van de Kieft, C.; Visser, J.C.; Wegner, J.G.","","1983","","Nederland; historische geografie; kaarten; stadsgeschiedenis","en","book","Delft University Press","","","","","","","","","","","","",""
"uuid:15e18c02-9ffe-4221-babe-626c6eafc39c","http://resolver.tudelft.nl/uuid:15e18c02-9ffe-4221-babe-626c6eafc39c","Historische stedenatlas van Nederland. Afl. 1. Haarlem","Speet, B.M.J.; Van Herwijnen, G.; Van de Kieft, C.; Visser, J.C.; Wegner, J.G.","","1982","","Haarlem; Nederland; geschiedenis; historische geografie; kaarten; stadsgeschiedenis","nl","book","Delft University Press","","","","","","","","","","","","",""
"uuid:ab332612-634a-448f-b70a-5e9292d07b4b","http://resolver.tudelft.nl/uuid:ab332612-634a-448f-b70a-5e9292d07b4b","Historische stedenatlas van Nederland. Afl. 2. Amersfoort","Speet, B.J.M.; Van Herwijnen, G.; Van de Kieft, C.; Visser, J.C.; Wegner, J.G.","","1982","","Nederland; historische geografie; kaarten; stadsgeschiedenis","nl","book","Delft University Press","","","","","","","","","","","","",""
"uuid:aa328dcc-cde5-44b7-ae28-445ea799ecf2","http://resolver.tudelft.nl/uuid:aa328dcc-cde5-44b7-ae28-445ea799ecf2","The proper longshore current in a wave basin","Visser, P.J.","","1982","This report describes the investigation into a method how to obtain the proper longshore current in a wave basin. In this method the basin geometry is optimized and the proper recirculation flow through openings in the wave guides is determined by minimizing the circulation flow between the wave guides. Using different wave fields, two beach slopes, two beach roughnesses and for most of the experiments a distribution system in the longshore current opening of the upstream wave guide, the width of the opening in the downstream wave guide and the recirculation flow were varied. The investigation shows that the adjustment of the longshore current has to be done carefully in order to achieve uniformity along the beach and the correct magnitude and distribution normal to the beach. A calculation of the order of magnitude of the terms of the equations of motion with some of the experimental results shows that the non-linear inertial and lateral friction terms cannot be neglected in rip current, nonuniform longshore current and nearshore circulation calculations.","longshore current; wave basin; circulation system","en","report","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:5c6c30f1-d080-4cb4-b068-221d929db271","http://resolver.tudelft.nl/uuid:5c6c30f1-d080-4cb4-b068-221d929db271","An introduction to the technique of singular perturbations applied to performance optimization problems in atmospheric flight mechanics","Visser, H.G.","","1982","","","en","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:b10b5d90-0d8e-4ff9-9c70-b1c7b05e0c7f","http://resolver.tudelft.nl/uuid:b10b5d90-0d8e-4ff9-9c70-b1c7b05e0c7f","Waterbeweging en menging in het zuidelijke gedeelte van de Noordzee: Eindverslag MLTP-4","Otto, L.; Van Dam, G.C.; Visser, M.P.","Van Eyden, W.A.A. (contributor); Van Schieveen, H.M. (contributor); Zimmerman, J.T.F. (contributor); Rijkswaterstaat","1980","Onderzoek is verricht naar verspreidingsmodellen en de gebruikte technieken achter deze modellen. Bij aanvang van de MLTP-periode bestonden er reeds verspreidingsmodellen. Deze modellen vertoonden echter tekortkomingen. De voornaamste daarvan waren: 1)het summiere gebruik van snelheidsgegevens, 2)de sterk vereenvoundige geometrie. Op geen van beide punten is een belangrijke verbetering mogelijk zonder ook het andere punt aan te pakken. De integratie van deze beide elementen in het geheel van de simulatie, diende dus, wat het einddoel van de thematiek betreft, het uitgangspunt te zijn. Wat de waterbeweging betreft ligt het zwaartepunt bij de reststromen, daar de getijbeweging onderwerp van studie was in de thematiek. Verder zijn de getijstromen en vooral de snelheidsgegevens uit modellen die (mede) het getij berekenen van zodanig groot belang voor de verspreidingsprocessen en de modellering daarvan, dat afzonderlijk aandacht wordt besteed aan waterbewegingsmodellen die mede of in hoofdzaak gericht zijn op getijberekening. Tenslotte is er aandacht besteed aan de verspreidingsverschijnselen en de verspreidingsmodellen, welke laatste het einddoel vormen van de thematiek. Als belangrijkste aanbevelingen komen naar voren: 1. Het bevorderen van een versnelling van de bouw van programmatuur voor een verspreidingsmodel op basis van deeltjessimulatie, met inbegrip van de wederzijdse aanpassing van de toeleverende bewegingsmodellen (getijmodellen, stormvloedmodellen) enerzijds en verspreidingsmodel anderzijds. In verband met de ""voeding"" van het bovenbedoelde model en eventuele andere transportmodellen moet er rekening gehouden worden met: - Voortzetting van het onderzoek naar het reststroomveld en de mogelijkheden van wiskundige modellering daarvan, i.h.b. van de niet-meteo-komponenten. - Voltooiing van het op initiatief van MLTP-4 (zie Texel 1974) gestarte project Numerieke Diepteschematisatie. 2. Vergelijkend onderzoek, vooral uit het oogpunt van rekentijden, kosten en doelmatigheid, van deeltjessimulatie en eindige differentie- of eindige elementenmethoden voor het oplossen van transportproblemen in kombinatie met interakties (met name chemische reakties).","waterbeweging; menging; modelleren; verspreiding; transport; deeltjessimulatie; verspreidingsmodel; waterbewegingsmodel; Noordzee; MLTP-4; eindige elementenmethode","nl","report","Rijkswaterstaat, Directie Waterhuishouding en Waterbeweging","","","","","","","","","","","","MLTP-4",""
"uuid:2462eecd-dcb1-4ccc-ab52-c70e5e9870fd","http://resolver.tudelft.nl/uuid:2462eecd-dcb1-4ccc-ab52-c70e5e9870fd","Bepaling van vervormingen en enkele geometrische grootheden van het DHC-2 ""Beaver"" laboratoriumvliegtuig","Kok, F.L.M.; Visser, J.L.F.","","1980","","","nl","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:059ff4d9-75e0-494a-9216-8f2451d57b72","http://resolver.tudelft.nl/uuid:059ff4d9-75e0-494a-9216-8f2451d57b72","Adjustable tower-gangway(MacGregor)","Visser, J.","","1980","","offshore","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:965419cf-7761-406b-92f7-a0b422e892f3","http://resolver.tudelft.nl/uuid:965419cf-7761-406b-92f7-a0b422e892f3","Bereiding van alkylatiebenzine","Visser, L.; Van der Zwan, J.","","1979","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:92229d6a-7e95-48eb-b6d1-84b1b5ccec7e","http://resolver.tudelft.nl/uuid:92229d6a-7e95-48eb-b6d1-84b1b5ccec7e","Onderzoek kunststoffilters in Botlek en Europoort: Grondonderzoek","Bakker, J.G.; Visser, R.C.","TU Delft","1978","In opdracht van de Technische Adviescommissie van de Nederlandse Vereniging voor Kust- en Oeverwerken zijn 12 monsters genomen uit de taluds van de Oude Maas in Botlek en Beneluxhaven in Europoort. Op delen uit het merendeel van deze monsters zijn korrelverdelingsanalyses uitgevoerd. Dit grondonderzoek vond plaats in het kader van het onderzoek naar de duurzaamheid van kunststoffen filters onder oeververdedigingen op haventaluds. Na verwijdering van de bekleding en het kuhststoffen weefsel zijn de monsters gestoken door monsterbussen met een lengte van 44 cm met de hand weg te drukken. In enkele gevallen zijn monsters op grotere diepte genomen door onder het niveau van de vorige bus nogmaals een bus weg te drukken.","geotextiel; grondonderzoek; Europoort","nl","report","Laboratorium voor Grondmechanina (Geodelft, Deltares)","","","","","","","","","","","","",""
"uuid:230f5a85-7236-4269-9019-0b96f86ed736","http://resolver.tudelft.nl/uuid:230f5a85-7236-4269-9019-0b96f86ed736","Wave set-up 2: Experimental investigation on normally incident waves","Visser, P.J.","","1977","Experiments do measure wave set up in the wave flumes of Delft University.","wave set up; set-up","en","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9a22a6d3-3425-4838-8e23-dd80781d2fe1","http://resolver.tudelft.nl/uuid:9a22a6d3-3425-4838-8e23-dd80781d2fe1","Excursiegids, najaarsexcursie 1977: Thema: toegepaste geomorfologie","Buysrogge, R.A.; De Jong, G.J.; Siereveld, J.J.; Visser, J.","Rijkswaterstaat","1977","Achtergrondinformatie bij een excursie naar diverse geomorfologisch interessante plaatsen in de Zeeuwse Delta","geomorfologie; Slikken van Flakkee; Grevelingen; Oosterschelde","nl","report","Rijkswaterstaat, Deltadienst","","","","","","","","","","","","Deltawerken",""
"uuid:b7c5980b-9888-4552-b854-10f979dd9947","http://resolver.tudelft.nl/uuid:b7c5980b-9888-4552-b854-10f979dd9947","Oceanografische omstandigheden in het zeegebied nabij Texel","Visser, M.P.","Rijkswaterstaat","1977","Complex oceanographic circumstances are often found near the island of Texel. Generally, large variations occur in the water density (salinity, temperature), both in horizontal and in vertical direction, and in the course of time. Current velocity and direction are often depth dependent. Interaction between one aspect and the other is not yet clear. The so-called Texel section (fig. 4) has been sampled for over fourty times during the period 1964-1969. Situations with no density gradients at all, or with gradients only in horizontal or vertical direction, are shown in fig. 6. The mean situation is shown schematically in fig. 8. It has been found that vertical stratification is dependent on tidal phase to a minor degree only (fig. 9). However, a strong connection was found between existence or absence of vertical density stratification in the water, and occurrence of strong winds (table V). The latter can almost prevent such a stratification near Texel for a period of 25 -.42 days afterwards. These figures agree well with the average time freshwater takes between its leaving the Rhine estuary and its arrival near Texel.","tidal currents; waddenzee; stratification","nl","report","KNMI","","","","","","","","","","","","",""
"uuid:9b8cc611-a92b-47bc-809f-fff71567f4f0","http://resolver.tudelft.nl/uuid:9b8cc611-a92b-47bc-809f-fff71567f4f0","Nader onderzoek van de ladder en ladderbok","Visser, C.","","1977","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:31138916-1bb8-4780-9533-19d04b4af61e","http://resolver.tudelft.nl/uuid:31138916-1bb8-4780-9533-19d04b4af61e","Metingen aan een vertikale cutter. Completie van Lab.opdracht LaO/77/73","Visser, C.","","1977","","Experimental assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:e7a15bb6-f407-49b7-a4ea-5e2498222aed","http://resolver.tudelft.nl/uuid:e7a15bb6-f407-49b7-a4ea-5e2498222aed","Constructieve uitwerking van de reeds eerder gemaakte winzuiger. (5de-jaars opdracht) Zie CO/76/83","Visser, C.","","1977","","Computer assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:94593faa-f0bb-4cfd-bac0-5103ec71ebac","http://resolver.tudelft.nl/uuid:94593faa-f0bb-4cfd-bac0-5103ec71ebac","Proefinstallatie voor de zuivering van oppervlaktewater ter bereiding van drinkwater: Fabrieksvoorontwerp","Jurgens, T.P.P.; Visser, J.K.","","1976","Document(en) uit de collectie Chemische Procestechnologie","zuivering van oppervlaktewater","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:0cb89a04-f08c-4145-a939-94d4dbbcaccf","http://resolver.tudelft.nl/uuid:0cb89a04-f08c-4145-a939-94d4dbbcaccf","Winzuiger voor zowel persen als bakkenladen. Zuigdiepte 50 m. (4de-jaars opdracht)","Visser, C.","","1976","","Computer assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:111f4f73-606c-4c95-bcfd-8d1f5d8c5848","http://resolver.tudelft.nl/uuid:111f4f73-606c-4c95-bcfd-8d1f5d8c5848","Het voorkomen van het subtropisch tussenwater voor de noordkust van Zuid-Amerika","Tijssen, S.B.; Van der Veen, K.; Visser, M.P.","Rijkswaterstaat","1976","Oceanographic observations were made during Autumn 1970 and Spring 1971. Special attention is given to the salinity maximum at about 100 m depth, resulting from the subtropical intermediate water possibly from both northern and southern origin. To obtain an insight in the spreading of these water types isentropic analysis according to Montgomery has been used. It turns out that during both periods of investigation an anticyclonic gyre is present off Surinam, and during autumn 1970 also off Brazil. However, it is demonstrated that the Surinam and the Brazil gyres differ ln watertypes, based on their temperature-oxygen relation, according to Metcalf and Stalcup.","Amazone; oceanographic observations; gyre; ocean currents","nl","report","KNMI","","","","","","","","","","","","",""
"uuid:2eb76bac-d48c-4f1b-a47c-7db476bab2ec","http://resolver.tudelft.nl/uuid:2eb76bac-d48c-4f1b-a47c-7db476bab2ec","Diep water langs de noordkust van Zuid-Amerika","Van Bennekom, A.J.; Tijssen, S.B.; Van der Veen, K.; Visser, M.P.","Rijkswaterstaat","1976","Results of CICAR-investigations off the northern Southamerican coast during autumn 1970 and spring 1971 are given, concerning the water below the 10oC-isotherm. Topographies of the sigma rt =27.3 and 27-4 surfaces indicate a motion of the Subantarctic Intermediate Water mass along the continental rise. This motion being far from regular gives an indication of meandering along the boundary of an ocean current. The Upper and Middle Northatlantic Deepwater are clearly distinguishable by their characteristics, i.e. salinity and oxygen maxima. It is possible for some of the deepest reaching stations to make a distinction in the bottom water between water of Arctic and of Antarctic origin. Extrapolation yields an antarctic bottom water contribution of about 40%, being in good agreement with literature.","Amazone; oceanographic observations; ocean current; stratification","nl","report","KNMI","","","","","","","","","","","","",""
"uuid:3c81a957-c073-48bf-8ebc-992557320e74","http://resolver.tudelft.nl/uuid:3c81a957-c073-48bf-8ebc-992557320e74","Golfvoortplanting in slagaderen","Visser, P.J.","","1975","Please note that only this summary is in english. The rest of the report is in dutch only. This paper deals with the wave propagation of harmonic travelling waves through an incompressible, Newtonian fluid contained within an elastic tube with homogeneous and isotropic wall material. In particular the next questions are considered: 1) What is the difference between the one-dimensional and the two-dimensional blood flow approach? 2) Is it possible to derive an expression for the wave velocity c without making important restrictions as a thin or an incrompessible wall? 3) What is the influence of vascular tethering on blood flow and wave propagation? After a historical review and some physiological aspects, an one-dimensional approach is considered. The equations for (axisymmetric) long waves are derived and linearized. From these equations the expressions for the wave velocity c, the phase velocity c_p, the damping number d and the longitudinal impedance per length Z_l are realised. In the next part of this paper, a two-dimensional flow is considered. The motion of the fluid is described by the linearized form of the Navier-Stoker equations. The motion of the wall is described by the equations of classical elasticity theory, the equations of Navier. Boundary conditions are used describing the continuity of stress and velocity components in the fluid and the tube. From these boundary conditions a set of six simultaneous equations in six unknown constants has been obtained. Because it is not possible to solve the set of six equations, asymptotic methods have been introduced. Furthermore, one boundary condition is strongly dependent on the tethering of the blood vessels to the surrounding tissues. Therefore two cases are considered. In the first case the longitudinal constraint of the blood vessels is very strong, the second case deals with the study of a freely moving tube. For both cases expressions are realised for the wave velocity c, the phase velocity c_p, the damping number d and the longitudinal impedance per length Z_l are compared with each other and with the one-dimensional approach. The next conclusions follow from this work: 1) It is not possible to describe quite satisfactory blood flow and wave propagation in blood vessels with an one-dimensional harmonic theory. 2) The influence of vascular tethering on blood flow and wave propagation is rather small. 3) The longitudinally constrained blood vessel conception approaches reality much better than the freely moving conception.","golfvoortplanting; wave propagation; blood flow; blood vessels; vascular tethering; Navier-Stokes; bloedstroming","nl","report","TU Delft, Department of Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:3c64912b-527a-4a40-b099-add10bf63398","http://resolver.tudelft.nl/uuid:3c64912b-527a-4a40-b099-add10bf63398","Deiningscompensatie","Visser, C.","","1975","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:fa51212d-c0ca-4bac-8bb3-d63e7ddfae7f","http://resolver.tudelft.nl/uuid:fa51212d-c0ca-4bac-8bb3-d63e7ddfae7f","Laboratory fermenter with an improved magnetic drive","Harder, W.; Visser, K.; Kuenen, J.G.","","1974","","FIELD Mesh Headings:*Bacteriological Techniques: IS, instrumentation *Fermentation Laboratories *Magnetics FIELD CAS Registry Numbers: FIELD Chemical Name: FIELD Other Source:","en","journal article","","","","","","","","","","","","","",""
"uuid:43a82269-8b71-47b8-9e9c-c73111a4143e","http://resolver.tudelft.nl/uuid:43a82269-8b71-47b8-9e9c-c73111a4143e","Landschapsoecologisch onderzoek: Slikken van Flakkee","Zuidema, F.C.; Feitsma, K.S.; De Jong, H.; Zijlstra, M.; Brinkman, J.H.; Saeijs, H.L.F.; Visser, J.; Smittenberg, J.C.; Pavlicek, K.O.","Van den Berg, J.A. (contributor); Zijlstra, M. (contributor); Saeijs, H.L.F. (contributor); Rijkswaterstaat","1973","Door de afsluiting van het Brouwershavense Gat in 1971 ontstond het Grevelingen Meer; een zout binnenmeer van ca. 14.000 ha, waarvan ca. 3.000 ha drooggevallen zandplaten, slikken en schorren. Het gebied waarover deze interim nota handelt, wordt gevormd door de buitendijkse gronden direct grenzend aan Goeree-Overflakkee, bekend als de Slikken van Flakkee. Dit gebied bestaat uit 1.400 ha drooggevallen slikken en zandplaten en ca. 300 ha voormalige schorren of kwelders. In dit gebied wordt een landschapsoecologisch onderzoek uitgevoerd, waarvan de eerste resultaten in deze interim nota zijn samengevat. Bij deze interim nota horen een zevental deelrapporten. Deelrapport 3 (Vegetatie), Deelrapport 5 (Microklimaat) en Deelrapport 6 (Loopkevers) zijn beschikbaar hier op de Hydro Repository. Bij het landschapsoecologisch onderzoek staat centraal het behouden en vergroten van de variatie in de ruimte en soms ook van de variatie in de tijd. Overzicht van de hoog te waarderen algemene kenmerken van het gebied: 1. Het gebied als geheel kenmerkt zich door zijn grootschaligheid, met naar verwachting een toenemende kleinschalige diversiteit. In ons land is dit van bijzondere betekenis. Zowel natuurwetenschappelijk als recreatief zijn er ruime mogelijkheden voor een gedifferentieerde ontwikkeling. 2. Van grote waarde zijn de geomorfologische opbouw, de reeds geconstateerde en verder te verwachten verschillen in hydrologie en zouthuishouding en de verschillen in uitgangssituatie voor wat betreft bodem en vegetatie. Er is een duidelijk onderscheid tussen de voormalige schorren en slikken, waarbij juist het overgangsgebied tussen beide een ruime variatie vertoont en daarom van grote waarde is. Dwars op deze overlangse zônering lopen de verschillende krekensystemen welke als natuur-historisch gegeven van betekenis zijn, omdat hieruit de invloed van de vroegere eb- en vloedwerking is af te lezen. 3. In de ondergrond zijn op sommige plaatsen slecht doorlatende klei- en veenlagen aanwezig, terwijl deze op andere plaatsen zijn verdwenen en opgevuld met goed waterdoorlatend materiaal. Dit heeft met verschillen in hoogte en bodemsamenstelling een grote invloed op de water- en zouthuishouding van de diverse plaatsen. 4. Het feit dat grote delen van de voormalige slikken nog af en toe overspoeld worden met zout water is van niet geringe betekenis. Hierdoor ontstaan namelijk interessante gradiënten in dynamiek, blijven grote delen nog lange tijd een open karakter behouden en zullen zowel botanisch als ornithologisch (zoölogisch) zeer waardevolle gebieden kunnen ontstaan. Dit geldt te meer omdat bovendien andere gradiënten, bijvoorbeeld op de grens tussen laag en hoog slik, kunnen voorkomen. 5. Het gebied wordt door de Roxenissepolder en het zanddepot min of meer in tweeën gedeeld. Wat daarbij opvalt is dat het noordelijk en zuidelijk deel naast overeenkomsten ook duidelijke verschillen vertonen. Het noordelijk schor had voor de afsluiting sterk het karakter van een aangroeiend schor. Het heeft daardoor fijnmazige structuren en er lopen geen grote geulen (prielen) door het slik heen. Het zuidelijk schor is duidelijk ouder en had voor de afsluiting een afslagrand. Een deel van de zuidelijke slikken is hoger dan de overige slikken en er zijn grote geulen (prielen) en inhammen aanwezig. 6. Ornithologisch wordt een zeer grote waarde toegekend aan de ondiepe vooroever, waarbij het gebied voor het zanddepot en de uiterste zuidpunt van de slikken de belangrijkste gebieden zijn. Recreatief oefent vooral de steile over van het hoge deel van de slikken een grote aantrekkingskracht uit. Voor de ontwikkeling van het gebied dient de weg der voorzichtigheid en geleidelijkheid te worden gekozen. Dit om de integratie van de mens in de natuur harmonisch te doen plaatsvinden, de actuele en potentiële waarde van het gebied te waarborgen en de natuurrecreatie optimaal te laten zijn. Een voortdurende dialoog tussen de inrichter enerzijds en de onderzoeker anderzijds is van het allegrootste belang om de wenselijkheden en de mogelijkheden op de juiste momenten te integreren.","landschapsoecologisch; oecologie; Slikken van Flakkee; onderzoek; waterhuishouding; zouthuishouding; slikken; schorren; ecologie","nl","report","Rijkswaterstaat, Deltadienst","","","","","","","","","","","","",""
"uuid:044ce28a-8807-4106-a1e0-b8020788b539","http://resolver.tudelft.nl/uuid:044ce28a-8807-4106-a1e0-b8020788b539","Ontwerp van een scheidingsapparaat","Visser, A.M.C.","","1973","","Experimental assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:58e200c3-04b7-4410-9016-1f77ee32e086","http://resolver.tudelft.nl/uuid:58e200c3-04b7-4410-9016-1f77ee32e086","Het leggen van pijpleidingen onder water","Visser, A.M.C.","","1972","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Offshore and Dredging Engineering","","",""
"uuid:3031dc9c-8891-48dd-be7a-ce8e7c7c586c","http://resolver.tudelft.nl/uuid:3031dc9c-8891-48dd-be7a-ce8e7c7c586c","Nitreuzen-verwijdering uit restgassen van een salpeterzuurfabriek","De Vleesschauwer, L.L.E.M.; Visser, H.K.P.N.","","1971","Document(en) uit de collectie Chemische Procestechnologie.","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:10c37194-1e9a-49e5-8b67-45ddfd6840b3","http://resolver.tudelft.nl/uuid:10c37194-1e9a-49e5-8b67-45ddfd6840b3","Microspheres with Ultrahigh Holmium Content for Radioablation of Malignancies","Bult, W.; Seevinck, P.R.; Krijger, G.C.; Visser, T.; Kroon-Batenburg, L.M.J.; Bakker, C.J.G.; Hennink, W.E.; Van het Schip, A.D.; Nijsen, J.F.W.","","","Purpose The aim of this study was to develop microspheres with an ultra high holmium content which can be neutron activated for radioablation of malignancies. These microspheres are proposed to be delivered selectively through either intratumoral injections into solid tumors or administered via an intravascularly placed catheter. Methods Microspheres were prepared by solvent evaporation, using holmium acetylacetonate (HoAcAc) crystals as the sole ingredient. Microspheres were characterized using light and scanning electron microscopy, coulter counter, titrimetry, infrared and Raman spectroscopy, differential scanning calorimetry, X-ray powder diffraction, magnetic resonance imaging (MRI), and X-ray computed tomography (CT). Results Microspheres, thus prepared displayed a smooth surface. The holmium content of the HoAcAc microspheres (44% (w/w)) was higher than the holmium content of the starting material, HoAcAc crystals (33% (w/w)). This was attributed to the loss of acetylacetonate from the HoAcAc complex, during rearrangement of acetylacetonate around the holmium ion. The increase of the holmium content allows for the detection of (sub)microgram amounts of microspheres using MRI and CT. Conclusions HoAcAc microspheres with an ultra-high holmium content were prepared. These microspheres are suitable for radioablation of tumors by intratumoral injections or treatment of liver tumors through transcatheter administration.","holmiumacetylacetonate; intratumoral; microspheres; multimodality; radioablation","en","journal article","Springer","","","","","","","","Applied Sciences","Radiation, Radionuclides and Reactors","","","",""
"uuid:04673bf9-979f-423e-b4ef-cb05fa2fe761","http://resolver.tudelft.nl/uuid:04673bf9-979f-423e-b4ef-cb05fa2fe761","The finite element method in deformation and heat conduction problems","Visser, W.","Besseling, J.F. (promotor)","1968","","","en","doctoral thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:5156e428-e690-4478-a688-96e05257e623","http://resolver.tudelft.nl/uuid:5156e428-e690-4478-a688-96e05257e623","Bereiding van kaliumnitraat volgens Southwest Potash","Sluimer, H.; Visser, P.R.","","1968","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:77f1b1d1-1c78-4628-89c6-3d9844ede3bd","http://resolver.tudelft.nl/uuid:77f1b1d1-1c78-4628-89c6-3d9844ede3bd","The axial stiffness of marine diesel engine crankshafts, Part I: Comparison between the results of full scale measurements and those of calculations according to published formulae","Visser, N.J.","","1967","","ship design production and operation","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:6c259443-a4c2-4846-8419-7c7ef60903e2","http://resolver.tudelft.nl/uuid:6c259443-a4c2-4846-8419-7c7ef60903e2","Schoonhoven: De ruimtelijke ontwikkeling van een kleine stad in het rivierengebied gedurende de Middeleeuwen","Visser, J.C.","Froger, J.H. (promotor); Ter Kuile, E.H. (promotor)","1964","","","en","doctoral thesis","Van Gorcum & Comp.","","","","","","","","Architecture","","","","",""
"uuid:a70e006a-1e14-4959-badd-447d8609e197","http://resolver.tudelft.nl/uuid:a70e006a-1e14-4959-badd-447d8609e197","Bereiding van etanol door direkte hydratatie van eteen","Visser, J.","","1962","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:669eb75f-f732-4426-946f-0e83f8d406d5","http://resolver.tudelft.nl/uuid:669eb75f-f732-4426-946f-0e83f8d406d5","Model tests concerning the damping coefficient and the increase in the moment of inertia due to entrained water of ship’s propellers","Visser, N.J.","","1960","","resistance & propulsion","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:999ca59c-91c9-46c6-8cee-7c532d61080b","http://resolver.tudelft.nl/uuid:999ca59c-91c9-46c6-8cee-7c532d61080b","Influence of piston temperature on piston fouling and piston ring, wear in diesel engines using residual fuels","Visser, H.","","1959","","ship design production and operation","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:3fe41557-efff-4258-ba20-763211fd81d3","http://resolver.tudelft.nl/uuid:3fe41557-efff-4258-ba20-763211fd81d3","Onderzoek van cilinderslijtage in dieselmotoren met behulp van Laboratorium slijtmachines","Visser, H.","","1954","","ship design production and operation","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:8c2a7606-90e5-4376-8ad6-c02075180e55","http://resolver.tudelft.nl/uuid:8c2a7606-90e5-4376-8ad6-c02075180e55","Rijshout-, Riet-, en Stro-constructies","Visser, J.G.","","1953","Lesboekje voor het technisch onderwijs voor het ontwerpen van oever en bodembeschermingsconstructies met zinkstukken en kraagstukken.","rijshout; oeverwerken; zinkstukken; kraagstukken","nl","report","Stam","","","","","","","","","","","","",""
"uuid:a283712b-909b-48c4-adca-f239c693bf86","http://resolver.tudelft.nl/uuid:a283712b-909b-48c4-adca-f239c693bf86","Cilinderslijtage in scheepsdieselmotoren","Visser, H.","","1952","","ship design production and operation","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:ded72b54-6ff4-43f2-b492-4dd422c2f121","http://resolver.tudelft.nl/uuid:ded72b54-6ff4-43f2-b492-4dd422c2f121","Oxaalzuur II","Visser, J.","","1951","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:9fda7f60-419b-4484-a30c-e1b87bdb0c58","http://resolver.tudelft.nl/uuid:9fda7f60-419b-4484-a30c-e1b87bdb0c58","Verslag over weerstandsmetingen aan een drietal zeilboot-modellen","Gerritsma, J.; Visser, H.; Schneiders, C.C.M.","","1951","","hydrodynamics","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:0ac443ae-2e59-46fc-b397-f4a46757e5cd","http://resolver.tudelft.nl/uuid:0ac443ae-2e59-46fc-b397-f4a46757e5cd","Analyse van de metingen aan boord van het motorschip Amstelstroom","Gerritsma, J.; Visser, H.; Schneiders, C.C.M.","","1951","","hydrodynamics","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:44045b52-91e7-4ac6-a2ff-07aada6ae892","http://resolver.tudelft.nl/uuid:44045b52-91e7-4ac6-a2ff-07aada6ae892","Some observations on air filtration","Kluyver, A.J.; Visser, J.","","1950","1. A method has been developed for testing the filtration efficiency of some filter materials. For each of the materials investigated — cotton wool, stillite and carbon — a suitable filter has been devised. 2. The filtered air was analyzed as to its germ content with the aid of a set of 3 capillary impingers. 3. The cotton wool filter gave on the whole satisfactory results provided that due attention was given to the packing of the filter and its sterilisation. Clear indications were obtained that the degree of the contamination of the air was of vital importance. 4. The stillite filter proved to have the advantage of combining a high filtration efficiency with a low resistance to the passing air. Also for the stillite filter a critical degree of contamination of the air was established; on surpassing this degree the filtration effect was endangered. 5. The carbon filter proved to be most efficient, but had a relatively low specific filtering capacity. It was found that the filtration result was depending on the height of the carbon column and on the velocity and the degree of contamination of the air. 6. It should be stressed that in all experiments artificially contaminated air was used, and that the number of germs present in the air to be filtered was in all cases many times larger than that usually occurring in normal air.","","en","journal article","Springer Netherlands","","","","","","","","Applied Sciences","","","","",""
"uuid:a52eda2d-d735-4314-b41a-f70c2d5b231a","http://resolver.tudelft.nl/uuid:a52eda2d-d735-4314-b41a-f70c2d5b231a","Fabricage van de grondstoffen voor Neopreen","Visser, J.","","1950","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:a0268fc7-df0a-43d5-bb7c-1ee7a22312ad","http://resolver.tudelft.nl/uuid:a0268fc7-df0a-43d5-bb7c-1ee7a22312ad","De bereiding van vloeibaar zwaveldioxide","Visser, W.","","1947","Document uit de collectie Chemische Procestechnologie","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:74dafe7c-eb8a-4cf5-9199-253a85075996","http://resolver.tudelft.nl/uuid:74dafe7c-eb8a-4cf5-9199-253a85075996","Toepassing van de kansberekening op den regenval met het oog op polderbemaling","Visser, B.","Tienstra, J.M. (promotor); Bottema, O. (promotor)","1947","This study aims at aiming an insight into the rainfall in the Netherlands with regard to the determination of the desirable capacity of draining-mills. With this end in view a statistical investigation has been made of the data of the daily quantities of rain during the years 1890 up to 1939 inclusive, at Boskoop, Leeghwater and Hoorn. First of all we have made a division into days with a rainfall up to 5 mm. and days with a rainfall exceeding 5 mm. In various ways we have tried to find out whether the probability of the rainfall on a particular day being at least 5.1 mm. is independent of the rainfall on the other days. The precipitations (classified: up to 5 mm. and exceeding 5 mm.) turn out not to be independent. Next each period of one or more successive days with a rainfall exceeding 5 mm., preceded and followed by a day with a precipitation up to 5 mm., has been considered as a unity, the remaining single days with a rainfall up to 5 mm. being also considered as unities. The aggregate of these two kinds of unities, e. g. for 50 months of January has been considered as a population. The observations during the months of January 1890, January 1891 etc. up to 1939 inclusive have been considered as 50 samples. The hypothesis that these two kinds of unities are independent has been tested and proves to be in accordance with the samples. Finally the distribution of the rainfall over the various days of the periods of days with a precipitation exceeding 5 mm., e. g. for 50 months of January, has been examined; the amounts are classified according to the division given in the introduction. The daily amounts of precipitation during these periods; are independent. Consequently (and this is very important) the mean daily precipitations for periods (of days with a rainfall exceeding 5 mm.) of various duration are equal for a series of months of the same name. The author has shown how, with the aid of the investigations mentioned, probabilities of future periods can be calculated. From the observations we can infer a frequency distribution, the irregularities Of which are ascribable to chance. It is necessary to smooth this irregular distribution. Pearson and Goodrich give suitable methods, which have been compared. Goodrich's method proves to lead to the end in view quicker than Pearson 's; for the rest the two methods are equally serviceable. Finally some practical problems arising in polder-draining have been formulated and solved. Attention has been specially drawn to the mean daily precipitation during periods of days with a rainfall exceeding 5 mm.","rainfall; drainage; statistics; polder","nl","doctoral thesis","IJdo Leiden","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:a17aee9a-be28-4a8c-8043-2573762b79d1","http://resolver.tudelft.nl/uuid:a17aee9a-be28-4a8c-8043-2573762b79d1","Over optische dissociatie van eenige twee-atomige moleculen","Visser, G.H.","Dorgelo, H.B. (promotor)","1932","","","nl","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""