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Zhang, F. (author), Westra, Kevin (author), Shen, Q. (author), Batashev, I. (author), Kiecana, A. (author), van Dijk, N.H. (author), Brück, E.H. (author)The novel all-d-metal Ni(Co)MnTi based magnetic Heusler alloys provide an adjustable giant magnetocaloric effect and good mechanical properties. We report that the second-order magnetic phase transition can be tailored in this all-d-metal NiCoMnTi based Heusler system by optimizing the Mn/Ti ratio, resulting in a reversible ferromagnetic-to...journal article 2022
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McPhail, C. (author), Maier, H. R. (author), Westra, S. (author), Kwakkel, J.H. (author), van der Linden, L. (author)Multiple plausible future scenarios are being used increasingly in preference to a single deterministic or probabilistic prediction of the future in the long-term planning of water resources systems. These scenarios enable the determination of the robustness of a system—the consideration of performance across a range of plausible futures—and...journal article 2020
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Beck, Hylke E. (author), Westra, Seth (author), Tan, Jackson (author), Pappenberger, Florian (author), Huffman, George J. (author), McVicar, Tim R. (author), Gründemann, Gaby J. (author), Vergopolan, Noemi (author), Fowler, Hayley J. (author), Lewis, Elizabeth (author), Verbist, Koen (author)We introduce the Precipitation Probability DISTribution (PPDIST) dataset, a collection of global high-resolution (0.1°) observation-based climatologies (1979–2018) of the occurrence and peak intensity of precipitation (P) at daily and 3-hourly time-scales. The climatologies were produced using neural networks trained with daily P observations...journal article 2020
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Westra, J.M. (author)Generation of electricity using renewable energy sources is becoming an integral part of the electrical energy mix. A substantial fraction of the electrical energy is foreseen to be generated by photovoltaic (PV) solar cells that directly convert light into electricity. Large scale application of building integrated PV is envisaged to aid the...doctoral thesis 2018
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McPhail, C. (author), Maier, H. R. (author), Kwakkel, J.H. (author), Giuliani, M (author), Castelletti, A (author), Westra, S. (author)Robustness is being used increasingly for decision analysis in relation to deep uncertainty and many metrics have been proposed for its quantification. Recent studies have shown that the application of different robustness metrics can result in different rankings of decision alternatives, but there has been little discussion of what potential...journal article 2018
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Weemstra, C. (author), Westra, W. (author), Snieder, R. (author), Boschi, L. (author)Measuring attenuation on the basis of interferometric, receiver-receiver surface waves is a non-trivial task: the amplitude, more than the phase, of ensemble-averaged cross-correlations is strongly affected by non-uniformities in the ambient wavefield. In addition, ambient noise data are typically pre-processed in ways that affect the amplitude...journal article 2014
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Westra, H.J.R. (author)In this Thesis, nonlinear dynamics and nonlinear interactions are studied from a micromechanical point of view. Single and doubly clamped beams are used as model systems where nonlinearity plays an important role. The nonlinearity also gives rise to rich dynamic behavior with phenomena like bifurcations, stochastic switching and amplitude...doctoral thesis 2012
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Westra, H.J.R. (author), Karabacak, D.M. (author), Brongersma, S.H. (author), Crego-Calama, M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)The interactions between parametrically- and directly-driven vibration modes of a clamped-clamped beam resonator are studied. An integrated piezoelectric transducer is used for direct and parametric excitation. First, the parametric amplification and oscillation of a single mode are analyzed by the power and phase dependence below and above the...journal article 2011
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Venstra, W.J. (author), Westra, H.J.R. (author), Van der Zant, H.S.J. (author)We demonstrate the coupling between the fundamental and second flexural modes of a microcantilever. A mechanical analogue of cavity-optomechanics is then employed, where the mechanical cavity is formed by the second vibrational mode of the same cantilever, coupled to the fundamental mode via the geometric nonlinearity. By exciting the cantilever...journal article 2011
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Venstra, W.J. (author), Westra, H.J.R. (author), Van der Zant, H.S.J. (author)We investigate the nonlinear dynamics of microcantilevers. We demonstrate mechanical stiffening of the frequency response at large amplitudes, originating from the geometric nonlinearity. At strong driving the cantilever amplitude is bistable. We map the bistable regime as a function of drive frequency and amplitude, and suggest several...journal article 2010
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- Westra, J. (author), Dignum, F. (author), Dignum, M.V. (author) conference paper 2010
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Westra, H.J.R. (author), Poot, M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)A theoretical and experimental investigation is presented on the intermodal coupling between the flexural vibration modes of a single clamped-clamped beam. Nonlinear coupling allows an arbitrary flexural mode to be used as a self-detector for the amplitude of another mode, presenting a method to measure the energy stored in a specific resonance...journal article 2010
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Westra, J.M. (author), Vavrunkova, V. (author), Sutta, P. (author), Van Swaaij, R.A.C.M.M. (author), Zeman, M. (author)Thin-film poly-crystalline silicon (poly c-Si) on glass obtained by crystallization of an amorphous silicon (a-Si) film is a promising material for low cost, high efficiency solar cells. Our approach to obtain this material is to crystallize a-Si films on glass by solid phase crystallization (SPC). As the grain size of SPC poly c-Si films will...journal article 2010
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Ventra, W.J. (author), Westra, H.J.R. (author), Babaei Gavan, K. (author), Van der Zant, H.S.J. (author)We demonstrate magnetomotive drive and detection of doubly clamped string resonators in water. A compact 1.9 T permanent magnet is used to detect the fundamental and higher flexural modes of 200??m long resonators. Good agreement is found between the magnetomotive measurements and optical measurements performed on the same resonator. The...journal article 2009
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Westra, A.H. (author), Heemskerk, J.W.T. (author), Korevaar, M.A.N. (author), Theuwissen, A.J.P. (author), Kreuger, R. (author), Ligtvoet, K.M. (author), Beekman, F.J. (author)Charge Coupled Devices (CCDs) optically coupled to scintillation crystals can be used to construct high resolution gamma cameras. Previously, several groups have reported intrinsic detector spatial resolutions below 100 microns. When the CCD images can be read out fast enough, the energy and interaction position of individual gamma quanta can be...journal article 2009
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Babaei Gavan, K. (author), Westra, H.J.R. (author), Van der Drift, E.W.J.M. (author), Venstra, W.J. (author), Van der Zant, H.S.J. (author)The effective Young’s modulus of silicon nitride cantilevers is determined for thicknesses in the range of 20–684 nm by measuring resonance frequencies from thermal noise spectra. A significant deviation from the bulk value is observed for cantilevers thinner than 150 nm. To explain the observations we have compared the thickness dependence of...journal article 2009
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Huisman, E (author), van der Voordt, Theo (author), Westra, H (author)Nu de markwerking in de zorg steeds meer zijn beslag krijgt, neemt de noodzaak tot strategisch sturen op zorgvastgoed sterk toe. Een gereguleerde marktwerking geeft meer autonomie in vastgoedbeslissingen, maar het betekent ook dat je zelf meer risico’s draagt. Kapitaallasten worden niet meer automatisch vergoed. Dit heeft belangrijke...journal article 2009
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- Westra, J.R. (author) doctoral thesis 1998
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Zandbergen, H.W. (author), Latenstein van Voorst, A. (author), Westra, C. (author), Hoveling, G.H. (author)A specimen holder for an electron microscope, comprising a bar-shaped body provided adjacent one end with means for receiving a specimen, with means being present for screening the specimen from the environment at least temporarily in airtight and moisture-proof manner in a first position, which screening means comprise at least one elastic seal...patent 1996
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Latenstein Van Voorst, A. (author), Westra, C. (author), Hoveling, G.H. (author), Zandbergen, H.W. (author)Abstract of NL 9402241 (A) Sample holder for an electron microscope provided with a rod-shaped body which near a first end is provided with means for accommodating a sample, means being present for at least temporarily airtightly and moisture-tightly shielding the sample against the environment in a first position. Said shielding means comprise...patent 1996
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