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Chavarrias Borras, V. (author), Stecca, Guglielmo (author), Siviglia, Annunziato (author), Blom, A. (author)A notable drawback in mixed-size sediment morphodynamic modeling is the fact that the most commonly used mathematical model in this field (i.e., the active layer model Hirano, 1971) can be ill-posed under certain circumstances. Under these conditions the model loses its predictive capabilities, as negligible perturbations in the initial or...journal article 2019
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Chavarrias Borras, V. (author), Schielen, R.M.J. (author), Ottevanger, Willem (author), Blom, A. (author)A two-dimensional model describing river morphodynamic processes under mixed-size sediment conditions is analysed with respect to its well posedness. Well posedness guarantees the existence of a unique solution continuously depending on the problem data. When a model becomes ill posed, infinitesimal perturbations to a solution grow infinitely...journal article 2019
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Rattanagraikanakorn, B. (author), Schuurman, M.J. (author), Gransden, Derek (author), Happee, R. (author), de Wagter, C. (author), Sharpanskykh, Alexei (author), Blom, H.A.P. (author)Recent developments in the concept of UAS operations in urban areas have led to risk concerns of UAS collision with human. To better understand this risk, head and neck injuries due to UAS collisions have been investigated by different research teams using crash dummies. Because of the limitations in biofidelity of a crash dummy, head injury...conference paper 2019
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Meysman, F.J.R. (author), Cornelissen, Rob (author), Trashin, Stanislav (author), Bonné, Robin (author), van der Veen, J.R. (author), Blom, C.J. (author), Beaumont, H.J.E. (author), van der Zant, H.S.J. (author), Boschker, H.T.S. (author)Biological electron transport is classically thought to occur over nanometre distances, yet recent studies suggest that electrical currents can run along centimetre-long cable bacteria. The phenomenon remains elusive, however, as currents have not been directly measured, nor have the conductive structures been identified. Here we demonstrate...journal article 2019
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Li, Mengmeng (author), Mangalore, Deepthi Kamath (author), Zhao, Jingbo (author), Carpenter, Joshua H. (author), Yan, Hongping (author), Ade, Harald (author), Müllen, Klaus (author), Blom, Paul W.M. (author), Pisula, Wojciech (author), de Leeuw, D.M. (author), Asadi, Kamal (author), Yan, He (author)It is still a great challenge to fabricate conjugated polymer monolayer field-effect transistors (PoM-FETs) due to intricate crystallization and film formation of conjugated polymers. Here we demonstrate PoM-FETs based on a single monolayer of a conjugated polymer. The resulting PoM-FETs are highly reproducible and exhibit charge carrier...journal article 2018
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Schielen, R.M.J. (author), Blom, A. (author)We derive an idealized model of a gravel-sand river bifurcation and analyze its stability properties. The model requires nodal point relations that describe the ratio of the supply of gravel and sand to the two downstream branches. The model predicts changes in bed elevation and bed surface gravel content in the two bifurcates under...journal article 2018
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Chavarrias Borras, V. (author), Stecca, Guglielmo (author), Labeur, R.J. (author), Blom, A. (author)The mixed-size character of sediment is a necessary property to ex- plain physical phenomena such as downstream fining or the presence of armor layers. The active layer model was developed to model mixed-size sediment in river morphodynamics. This model assumes that the topmost part of the bed, the active layer, has no vertical stratification...journal article 2018
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Siele, Meles (author), Blom, A. (author), Viparelli, Enrica (author)In response to changes in the upstream controls (i.e., the water discharge, the sediment supply rate, and the calibre of the load), engineered alluvial channels adjust their bed slope and bed surface texture to establish a new equilibrium state. Here we present and discuss various causes of degradational response of engineered channels to...journal article 2018
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Bouarfa, S. (author), Müller, Jasper (author), Blom, H.A.P. (author)Each day, airlines face disturbances that disrupt their carefully planned operations. Events like adverse weather conditions, sick crew members, or damaged aircraft often result in delays in the airline's schedule. An airline recovers from such disruptions through the role played by its Airline Operations Control (AOC). A Multi-Agent System ...journal article 2018
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Chavarrias Borras, V. (author), Stecca, G. (author), Blom, A. (author)In this paper we analyze the Hirano active layer model used in mixed sediment river morphodynamics concerning its ill-posedness. Ill-posedness causes the solution to be unstable to short-wave perturbations. This implies that the solution presents spurious oscillations, the amplitude of which depends on the domain discretization. Ill-posedness...journal article 2018
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Sun, Junzi (author), Blom, H.A.P. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper focuses on estimating aircraft mass and thrust setting using a recursive Bayesian method called particle filtering. The method is based on a nonlinear state-space system derived from aircraft point-mass performance models. Using solely ADS-B and Mode-S data, flight states such as position, velocity, and wind speed are collected and...conference paper 2018
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Abate, Alessandro (author), Blom, H.A.P. (author), Cauchi, Nathalie (author), Haesaert, Sofie (author), Hartmanns, Arnd (author), Lesser, Kendra (author), Oishi, Meeko (author), Sivaramakrishnan, Vignesh (author), Soudjani, Sadegh (author)This report presents the results of a friendly competition for formal verification and policy synthesis of stochastic models. The friendly competition took place as part of the workshop Applied Verification for Continuous and Hybrid Systems (ARCH) in 2018. In this first edition, we present five benchmarks with different levels of complexities...conference paper 2018
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Chavarrias Borras, V. (author), Blom, A. (author), Orru, C. (author), Martín-Vide, Juan Pedro (author), Viparelli, Enrica (author)Laboratory experiments were conducted on a sand-gravel Gilbert delta to gain insight on its dynamics under varying base level. Base level rise results in intensified aggradation over the topset, as well as a decrease in topset slope and topset surface coarsening, the signals of which migrate in an upstream direction. Preferential deposition...journal article 2018
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Mitici, M.A. (author), Blom, H.A.P. (author)Increasing traffic demands and technological developments provide novel design opportunities for future air traffic management (ATM). In order to evaluate current air traffic operations and future designs, over the past decades, several mathematical models have been proposed for air traffic conflict and collision probability estimation....journal article 2018
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Rattanagraikanakorn, B. (author), Sharpanskykh, Alexei (author), Schuurman, M.J. (author), Gransden, D.I. (author), Blom, H.A.P. (author), de Wagter, C. (author)UAS will be integrated into the airspace in the near future, but the risk of UAS collision is not well understood which hampers the development of adequate regulations and standards. As risk has two constituents: frequency and consequence, collision risk analysis of UAS operations in future UTM asks for a quantitative assessment of various...conference paper 2018
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Blom, H.A.P. (author), Ma, H. (author), Bakker, G. J.(Bert) (author)This paper studies estimation of reach probability for a generalized stochastic hybrid system (GSHS). For diffusion processes a well-developed approach in reach probability estimation is to introduce a suitable factorization of the reach probability and then to estimate these factors through simulation of an Interacting Particle System (IPS)....journal article 2018
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Rheza Rahadian, Rheza (author), van der Woude, Sallo (author), Wilschut, D. (author), Blom, C.B.M. (author), Broere, W. (author)During inspections of several immersed tunnels in the Netherlands, damage of immersion joints has been observed. In some cases the Gina seal has moved inwards from its original location, and in other cases a permanent elongation of the entire tunnel structure has been measured. For both cases it has been hypothesised that a seasonal expansion...conference paper 2018
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Blom, A. (author), Chavarrias Borras, V. (author), Ferguson, Robert I. (author), Viparelli, Enrica (author)Downstream fining of bed sediment in alluvial rivers is usually gradual, but often an abrupt decrease in characteristic grain size occurs from about 10 to 1 mm, i.e., a gravel-sand transition (GST) or gravel front. Here we present an analytical model of GST migration that explicitly accounts for gravel and sand transport and deposition in the...journal article 2017
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- Blom, A. (author), Arkesteijn, L. (author), Chavarrias Borras, V. (author), Viparelli, Enrica (author) journal article 2017
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Blom, D.S. (author)Fluid-structure interaction simulations are crucial for many engineering problems. For example, the blood flow around new heart valves or the deployment of airbags during a car crash are often modeled with fluidstructure interaction simulations. Also, to design safe parachutes, simulations are carried out to model the unsteady deformations of...doctoral thesis 2017