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Dukalski, M. (author), Rovetta, D. (author), van der Linde, S.G. (author), Möller, M. (author), Neumann, N. (author), Phillipson, F. (author)Much of recent progress in geophysics can be attributed to the adaptation of heterogeneous high-performance computing architectures. It is projected that the next major leap in many areas of science, and hence hopefully in geophysics too, will be due to the emergence of quantum computers. Finding a right combination of hardware, algorithms, and...article 2023
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van Meer, M. (author), Witvoet, G. (author), Oomen, T. (author)Switched reluctance motors are appealing because they are inexpensive in both construction and maintenance. The aim of this paper is to develop a commutation function that linearizes the nonlinear motor dynamics in such a way that the torque ripple is reduced. To this end, a convex optimization problem is posed that directly penalizes torque...article 2022
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Nijenhuis, J.R. (author), Jonker, W.A. (author), Kamphues, F.G. (author)TNO, in close cooperation with Demcon, has designed the Laser Projection Subsystem (LPS) for ESO’s Extremely Large Telescope (ELT). The ELT LPS will consist of up to 8 laser projection subunits. The design is based on the Four Laser Guide Star Facility (4LGSF), built for the ESO Very Large Telescope (VLT) (5). The VLT AO system has been...conference paper 2022
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Nijenhuis, J.R. (author), van der Heiden, N. (author), Jonker, W.A. (author)TMT will be a telescope with 492 segments making up the primary mirror. Each of these segments is supported with a highly sophisticated Segment Support Assembly (SSA) and each of them is to be tested for acceptance using a tool called SMATT. This tool will be mounted on top of each SSA and provides the load distribution applied to its 27 support...conference paper 2022
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Rozsas, A. (author), Slobbe, A. (author), Martini, G. (author), Jansen, R. (author)This paper describes a static diagnostic load testing and measurement campaign of a reinforced concrete road bridge in Amsterdam. We consider 29 vertical translation sensors and 37 strain sensors. Multiple Bayesian parameter estima tions are performed to estimate two structural and two load parameters of a three-dimensional finite element (FE)...article 2022
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Mooij, A.J. (author)In the last couple of years several dynamically-typed, object-oriented programming languages have been equipped with optional static type checkers. This typically requires these languages to be extended with a downcast operator, which is a common operator in statically-typed languages but not in dynamically-typed languages.Our objective is to...article 2022
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Tacx, P. (author), Habraken, R. (author), Witvoet, G. (author), Kuiper, S. (author), Heertjes, M. (author), Oomen, T. (author)Adaptive optics systems are essential in ground-based astronomical observatories and in laser communication through free space. In particular, turbulence in the atmosphere causes wavefront aberrations that set a limit on the achievable image quality. Adaptive optics systems allow to actively compensate the atmospheric disturbances which leads to...conference paper 2022
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- Boehrer, N. (author), Nieuwenhuizen, R.P.J. (author), Dijk, J. (author) conference paper 2020
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van der Burg, E. (author), Hogervorst, M.A. (author), Toet, A. (author)Targets that are well camouflaged under static conditions are often easily detected as soon as they start moving. We investigated and evaluated ways to design camouflage that dynamically adapts to the background and conceals the target while taking the variation in potential viewing directions into account. In a human observer experiment...conference paper 2020
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Rangnau, T. (author), van Buijtenen, R. (author), Fransen, F. (author), Turkmen, F. (author)Continuous Integration (CI) and Continuous Delivery (CD) have become a well-known practice in DevOps to ensure fast delivery of new features. This is achieved by automatically testing and releasing new software versions, e.g. multiple times per day. However, classical security management techniques cannot keep up with this quick Software...conference paper 2020
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de Roose, F. (author), Genoe, J. (author), Kronemeijer, A.J. (author), Myny, K. (author), Dehaene, W. (author)Thin-film transistor (TFT) technologies have long been used predominantly for display fabrication and are attractive for large area, low cost and flexible circuit applications. Thanks to the improving performance of thin-film metal-oxide NFC tags and data processing chips on foil [1], [2], fabs are considering the large-scale production of...conference paper 2019
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Koopman, A.S. (author), Kingma, I. (author), Faber, G.S. (author), de Looze, M.P. (author), van Dieën, J.H. (author)With mechanical loading as the main risk factor for LBP in mind, exoskeletons are designed to reduce the load on the back by taking over a part of the required moment. The present study assessed the effect of a passive exoskeleton on back and abdominal muscle activation, hip and lumbar flexion and on the contribution of both the human and the...article 2019
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Schout, G. (author), Griffioen, J. (author), Majid Hassanizadeh, S (author), Cardon de Lichtbuer, G. (author), Hartog, N. (author)Methane leakage caused by well integrity failure was assessed at 28 abandoned gas wells and 1 oil well in the Netherlands, which have been plugged, cut and buried to below the ground surface (≥3 mbgl). At each location, methane concentrations were thoroughly scanned at the surface. A static chamber setup was used to measure methane flow rates...article 2019
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Hendriks, M. (author), Ara, H.A. (author), Geilen, M. (author), Basten, A.A. (author), Marin, R.G. (author), de Jong, R. (author), van der Vlugt, S. (author)Many high data-rate video-processing applications are subject to a trade-off between throughput and the sizes of buffers in the system (the storage distribution). These applications have strict requirements with respect to throughput as this directly relates to the functional correctness. Furthermore, the size of the storage distribution relates...article 2018
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Calvert, S.C. (author), Rypkema, J. (author), Holleman, B. (author), Azulay, D. (author), de Jong, A. (author)This study investigates different methods to visualise uncertainty in static representations of probabilistic traffic models predictions on road-networks. Although various graphical cues may be used to represent uncertainty it is not a priori clear which of them are most suited for this purpose, since their legibility, intelligibility and the...article 2017
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Bronkhorst, A.J. (author), Geurts, C.P.W. (author), van Bentum, C.A. (author), van der Knaap, L.P.M. (author), Pertermann, I. (author)An atmospheric boundary layer wind tunnel study was performed to determine the overall horizontal wind load on multi-span duo-pitch greenhouses. The results of this study are intended for the stability design of inflexible Gladding system greenhouses (designated as Class A in EN 13031-1) with roof pitch angles of 23-24' and ridge heights of 7.5...article 2017
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)The present work describes the electrical, mechanical and acoustical behavior of a thin honey-comb structure as an acoustic source. The acoustic source has to operate in the low frequency, quasi-static regime and is driven by a piezoelectric stack actuator. In addition, a two-way energy flow between the actuator and a connected amplifier is...conference paper 2016
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Nijenhuis, J.R. (author), Heijmans, J.A.C. (author), de Breeje, R. (author), Hazelebach, R.L.M. (author), de Vreugd, J. (author), Crowcombe, W.E. (author), Naron, D.J. (author), Fritz, E.C. (author), Borghi, G. (author), Navarro, R. (author), Sillari, L. (author), Sambenedetto, E. (author), Eder, J. (author), Kamphues, F.G. (author)Described is the M1 segment support, as designed by TNO in the period 2015- 2016. The design has significantly changed and improved compared to the earlier designs. During the period 2009-2010 prototypes for the primary mirror support of the E-ELT have been developed. These have been extensively tested by ESO. Design improvement were found to be...conference paper 2016
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Shekhar, A. (author), Prasanth, V. (author), Bauer, P. (author), Bolech, M. (author)The economic viability of on-road wireless charging of electric vehicles (EVs) strongly depends on the choice of the inductive power transfer (IPT) system configuration (static or dynamic charging), charging power level and the percentage of road coverage of dynamic charging. In this paper, a case study is carried out to determine the expected...article 2016
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Simons, E.C. (author), Weerheijm, J. (author), Sluys, L.J. (author)The Johnson-Holmquist-2 ceramic model is used for quasi-static indentation simulation. A modification is proposed to an associated plasticity formulation. This allows for a fully implicit solution scheme, where dilatation is used instead of the traditional explicit bulking formulation. Dilatation is shown to have an important influence on ring...conference paper 2016