Searched for: subject%3A%22Numerical%255C%2Bmethods%22
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Vijn, A. (author), Peet, B.J. (author), Schaaphok, M. (author), Lepelaars, E. (author), Heemink, A. (author)
This paper presents a hybrid model to estimate the magnetic behaviour of a ferromagnetic structure. The mathematical-physical model has been developed using the Method of Moments combined with a hysteresis model. The mathematical model was derived by a linearisation of the hysteresis curve. The initial magnetic state of a ferromagnetic object is...
article 2022
document
Li, L. (author), Hoefsloot, H. (author), de Graaf, A.A. (author), Acar, E. (author), Smilde, A.K. (author)
Background: Analysis of dynamic metabolomics data holds the promise to improve our understanding of underlying mechanisms in metabolism. For example, it may detect changes in metabolism due to the onset of a disease. Dynamic or time-resolved metabolomics data can be arranged as a three-way array with entries organized according to a subjects...
article 2022
document
Simons, E.C. (author), Weerheijm, J. (author), Toussaint, G. (author), Sluys, L.J. (author)
In this study, the impact of a steel spherical projectile on an alumina ceramic is considered. New experimental and numerical results are presented and analysed. Numerical results are obtained using the Finite Element Method and the upgraded viscosity regularized Johnson-Holmquist-2 constitutive model to describe the ceramic material behaviour....
article 2020
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Katliar, M. (author), Olivari, M. (author), Drop, F.M. (author), Nooij, S. (author), Diehl, M. (author), Bülthoff, H.H. (author)
This paper presents a method to simultaneously compute optimal simulator motions and simulator parameters for a predefined set of vehicle motions. The optimization can be performed with a model of human motion perception or sensory dynamics taken into account. The simulator dynamics, sensory dynamics, and optimality criterion are provided by the...
article 2019
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Pereira Barata, A. (author), Takes, F.W. (author), van den Herik, H.J. (author), Veenman, C.J. (author)
conference paper 2019
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van Wees, J.D. (author), Pluymaekers, M. (author), Osinga, S. (author), Fokker, P. (author), van Thienen-Visser, K. (author), Orlic, B. (author), Wassing, B. (author), Hegen, D. (author), Candela, T. (author)
Building geomechanical models for induced seismicity in complex reservoirs poses a major challenge, in particular if many faults need to be included. We developed a novel way of calculating induced stress changes and associated seismic moment response for structurally complex reservoirs with tens to hundreds of faults. Our specific target was to...
article 2019
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Brouns, E. (author), van der Eerden, F. (author), Eisses, A.R. (author), Kruyen, A.H.J. (author), van Vliet, W. (author)
A series of resonators alongside a road or railway can be used to diffract noise upwards to create a zone of noise reduction behind the elements. The company 4Silence developed the so-called Whisstone, a concrete block with 18 resonators of different depths designed to operate in a broad frequency range. Several measurements at short distance,...
conference paper 2018
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Zardetto, V. (author), Senes, A. (author), Najafi, M. (author), Zhang, D. (author), Joly, R. (author), Chippari, M. (author), Arneouts, T. (author), Poodt, P. (author), Veenstra, S. (author), Andriessen, R. (author)
In order to bring the organo-lead halide perovskite solar cells (PSC) towards the commercialization, the device stability needs to be drastically improved. Our approach relies on the introduction of a compact metal oxide (MeO) layer in a p-i-n planar architecture by means of atmospheric pressure spatial atomic layer deposition (s-ALD) technique....
conference paper 2018
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van der Waa, J.S. (author), van Diggelen, J. (author), Neerincx, M.A. (author)
Explainable AI becomes increasingly important as the use of intelligent systems becomes more widespread in high-risk domains. In these domains it is important that the user knows to which degree the system’s decisions can be trusted. To facilitate this, we present the Intuitive Confidence Measure (ICM): A lazy learning meta-model that can...
conference paper 2018
document
Theelen, M.J. (author), de Graaf, F. (author), Daume, F. (author), Barreau, N. (author), Vroon, Z.A.E.P. (author), Zeman, M. (author)
Degradation rates and mechanisms for molybdenum back contacts and ZnO:Al front contacts exposed to damp heat were obtained from literature and experiments. It was found that molybdenum back contacts with a higher density and covered by a MoSe2 film are more stable than their low density, bare counterparts. For ZnO:Al front contacts various...
conference paper 2018
document
Zhang, Y. (author), Leeuwenburgh, O. (author)
Recently, a distance parameterization of flood fronts derived from seismic anomalies was proposed as a solution in combination with the ensemble Kalman filter (EnKF), which is known as an efficient method for conditioning of multiple reservoir models to observed data. Even though the distance parameterization in terms of front positions is...
conference paper 2016
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Mora, A. (author), Biermann, M. (author), Bombrun, A. (author), Boyadjian, J. (author), Chassat, F. (author), Corberand, P. (author), Davidson, M. (author), Doyle, D. (author), Escolar, D. (author), Gielesen, W.L.M. (author), Guilpain, T. (author), Hernandez, J. (author), Kirschner, V. (author), Klioner, S.A. (author), Koeck, C. (author), Laine, B. (author), Lindegren, L. (author), Serpell, E. (author), Tatry, P. (author), Thoral, P. (author)
The Gaia all-sky astrometric survey is challenged by several issues affecting the spacecraft stability. Amongst them, we find the focus evolution, straylight and basic angle variations Contrary to pre-launch expectations, the image quality is continuously evolving, during commissioning and the nominal mission. Payload decontaminations and...
conference paper 2016
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Bogerd, C.P. (author), Aerts, J.M. (author), Annaheim, S. (author), Bröde, P. (author), de Bruyne, G. (author), Flouris, A.D. (author), Kuklane, K. (author), Sotto Mayor, T. (author), Rossi, R.M. (author)
The thermal effects related to wearing headgear are complex and different studies have investigated single parts of this topic. This review aims at summarizing the different findings to give a complete overview on this topic as well as to suggest new perspectives. Headgear increases head insulation and therefore is mainly problematic under warm...
article 2015
document
Pijloo, J.T. (author), Portegies Zwart, S.F. (author), Alexander, P.E.R. (author), Gieles, M. (author), Larsen, S.S. (author), Groot, P.J. (author), Devecchi, B.A. (author)
We have coupled a fast, parametrized star cluster evolution code to a Markov Chain Monte Carlo code to determine the distribution of probable initial conditions of observed star clusters, that may serve as a starting point for future N-body calculations. In this paper, we validate our method by applying it to a set of star clusters which have...
article 2015
document
de Klerk, W.P.C. (author)
The surveillance of gun propellants is basically performed either by an investigation into the thermal behavior of the propellant or by the determination of its remaining effective stabilizer content. Over the years it is shown that the surveillance of NC based gun propellants is necessary. NC based materials are intrinsically unstable, and can...
article 2015
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Nijhof, M.J.J. (author), Binnerts, B. (author), de Jong, C.A.F. (author), Ainslie, M.A. (author)
Modelling the sound levels in the water column due to pile driving operations nearby and out to large distances from the pile is crucial in assessing the likely impact on marine life. Standard numerical techniques for modelling the sound radiation from mechanical structures such as the finite element (FE) and boundary element method are not well...
conference paper 2014
document
Grossiord, N. (author), Kroon, J.M. (author), Andriessen, H.A.J.M. (author), Blom, P.W.M. (author)
In the present review, the main degradation mechanisms occurring in the different layer stacking (i.e. photoactive layer, electrode, encapsulation film, interconnection) of polymeric organic solar cells and modules are discussed. Bulk and interfacial, as well as chemical and physical degradation mechanisms are reviewed, as well as their...
article 2012
document
Gromala, P. (author), Duerr, J. (author), Dressler, M. (author), Jansen, K.M.B. (author), Hawryluk, M. (author), de Vreugd, J. (author)
Numerical simulation plays an important role in product design. Its accuracy relays on a detailed description of geometry, material models, load and boundary conditions. This paper focuses on a new approach of FEM material modeling of three commercially available molding compounds. Curing shrinkage, modulus of elasticity and coefficient of...
conference paper 2011
document
Walraven, J.C. (author), Bigaj-van Vliet, A. (author)
The fib Model Code is a recommendation for the design of reinforced and prestressed concrete which is intended to be a guiding document for future codes. Model Codes have been published before, in 1978 and 1990. The draft for fib Model Code 2010 was published in May 2010. The most important new element in this Model Code is "Time" in the sense...
article 2011
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Weiss, M. (author)
The problem of evaluating the performance of an uncertain guidance loop system is considered, when the uncertainty is described in terms of an integral quadratic constraint. The idea of the approach proposed in this paper is to determine the set of all possible state vector values at the end of the flight that are compatible with the model...
conference paper 2010
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