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Zhu, C. (author), Klapwijk, R.M. (author), Silva-Ordaz, Miroslava (author), Spandaw, J.G. (author), de Vries, M.J. (author)
Spatial thinking is ubiquitous in design. Design education across all age groups encompasses a range of spatially challenging activities, such as forming and modifying mental representations of ideas, and visualizing the scenarios of design prototypes being used. While extensive research has examined the cognitive processes of spatial...
journal article 2024
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Zhu, C. (author), Klapwijk, R.M. (author), Silva-Ordaz, Miroslava (author), Spandaw, J.G. (author), de Vries, M.J. (author)
Understanding and effectively using visual representations is important to learning science, technology, engineering, and mathematics (STEM). Various techniques to visualize information, such as two- and three-dimensional graphs, diagrams, and models, not only expand our capacity to work with different types of information but also actively...
journal article 2023
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Klapwijk, M.D. (author), Lloyd, Thomas (author), Vaz, Guilherme (author)
A new partially averaged Navier-Stokes (PANS) closure is derived based on the k-kL (KSKL) model. The aim of this new model is to incorporate the desirable features of the KSKL model, compared to the k-ω shear stress transport model, into the PANS framework. These features include reduced eddy-viscosity levels, a lower dependency on the cell...
journal article 2022
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Cristiano, Elena (author), Annis, Antonio (author), Apollonio, Ciro (author), Urru, Salvatore (author), Pelorosso, Raffaele (author), Francipane, Antonio (author), Hoes, O.A.C. (author), Klapwijk, Friso (author), Nardi, Fernando (author)
Green roofs have been widely recognized as sustainable nature-based solutions to mitigate floods in urban areas, which, in the last decades, are increasing due to the combination of intense worldwide urbanization and climate change. Besides flood mitigation, green roofs provide additional benefits for the urban environment (e.g., reducing the...
journal article 2022
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Klapwijk, M.D. (author), Lemaire, Sébastien (author)
Increased graphical capabilities of contemporary computer hardware make ray tracing possible for a much wider range of applications. In science, and numerical fluid mechanics in particular, visual inspections still play a key role in both understanding flows, predicted by computational fluid dynamics, exhibiting features observable in real-life,...
journal article 2021
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Lidtke, Artur K. (author), Klapwijk, M.D. (author), Lloyd, Thomas (author)
Inflow turbulence is relevant for many engineering applications relating to noise generation, including aircraft wings, landing gears, and non-cavitating marine propellers. While modelling of this phenomenon is well-established for higher Mach number aerospace problems, lower Mach number applications, which include marine propellers, still...
journal article 2021
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Breunig, Daniel (author), Zhang, Song Bo (author), Trauzettel, Björn (author), Klapwijk, T.M. (author)
We evaluate the microscopically relevant parameters for electrical transport of hybrid superconductor-semiconductor interfaces. In contrast to the commonly used geometrically constricted metallic systems, we focus on materials with dissimilar electronic properties like low-carrier density semiconductors combined with superconductors, without...
journal article 2021
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Westig, M.P. (author), Thierschmann, R. (author), Katan, A.J. (author), Finkel, M. (author), Klapwijk, T.M. (author)
We experimentally study the free-space electromagnetic field emitted from a multimode rectangular waveguide equipped with a diagonal-horn antenna. Using the frequency range of 215-580 GHz, a photomixer is used to launch a free-space circularly polarized electromagnetic field, exciting multiple modes at the input of the rectangular waveguide...
journal article 2021
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Klapwijk, M.D. (author), Lloyd, T. (author), Vaz, G. (author), van Terwisga, T.J.C. (author)
The Delft Twist 11 Hydrofoil is a common test case for investigating the interaction between turbulence and cavitation modelling in computational fluid dynamics. Despite repeated investigations, results reported for the lift and drag coefficient are accompanied by significant uncertainties, both in experimental and numerical studies. When...
journal article 2021
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Roël-Looijenga, A. (author), Klapwijk, R.M. (author), de Vries, M.J. (author)
During a Design and Technology class, engagement is both required to start creative hands-on work and a sign of pupil’s creative thinking. To find ways to achieve engagement, we can look to the Montessori tradition. Due to the fact that learning is regarded as feeding insight through experimenting, tasks have to offer pupils the opportunity to...
journal article 2020
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Baselmans, J.J.A. (author), Bosma, S. (author), Ikarashi, S. (author), Klapwijk, T.M. (author), Llombart, Nuria (author), Pascual Laguna, A. (author), Thoen, David (author), de Visser, P.J. (author), Yurduseven, O. (author), Endo, A. (author)
We are developing an ultra-wideband spectroscopic instrument, DESHIMA (DEep Spectroscopic HIgh-redshift MApper), based on the technologies of an on-chip filter bank and microwave kinetic inductance detector (MKID) to investigate dusty starburst galaxies in the distant universe at millimeter and submillimeter wavelengths. An on-site experiment of...
journal article 2020
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Thierschmann, R. (author), Çetinay Iyicil, H. (author), Finkel, M. (author), Katan, A.J. (author), Westig, M.P. (author), Van Mieghem, P.F.A. (author), Klapwijk, T.M. (author)
We study the electrodynamic impedance of percolating conductors with a predefined network topology using a scanning microwave impedance microscope at gigahertz frequencies. For a given percolation number we observe strong spatial variations across a sample that correlate with the connected regions (clusters) in the network when the...
journal article 2020
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Semenov, A. V. (author), Devyatov, I. A. (author), Westig, M.P. (author), Klapwijk, T.M. (author)
We address parametric amplifiers and kinetic inductance detectors, using concepts of the microscopic theory of superconductivity, and focusing on the interaction of microwave radiation with the superconducting condensate. This interaction was identified in recent experiments as the source of the apparent dissipation in microwave...
journal article 2020
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Klapwijk, T.M. (author), de Visser, P.J. (author)
We trace the historical fate of experiment and theory of microwave-stimulated superconductivity as originally reported for constriction-type superconducting weak links. It is shown that the observed effect disappeared by improving weak links to obtain the desired Josephson properties. Separate experiments were carried out to evaluate the...
journal article 2020
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Westig, M.P. (author), Thierschmann, R. (author), Katan, A.J. (author), Finkel, M. (author), Klapwijk, T.M. (author)
We study experimentally the transmission of an electromagnetic waveguide in the frequency range from 160 to 300 GHz. Photo-mixing is used to excite and detect the fundamental TE<sub>10</sub> mode in a rectangular waveguide with two orders-of-magnitude lower impedance. The large impedance mismatch leads to a strong frequency dependence of the...
journal article 2020
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Schut, A. (author), van Mechelen, M.P.P. (author), Klapwijk, R.M. (author), Gielen, M.A. (author), de Vries, M.J. (author)
Design feedback is an essential pedagogical tool that can help young novice designers navigate divergent and convergent paths while designing. However, design feedback is often met with resistance, which counteracts its potential to help novice designers evaluate their design and generate new solution directions. In this paper, we report on...
journal article 2020
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Klapwijk, M.D. (author), Lloyd, T. (author), Vaz, G. (author), van Terwisga, T.J.C. (author)
Different variable resolution turbulence modelling approaches (Hybrid, Bridging models and LES) are evaluated for turbulent channel flow at Re<sub>τ</sub>=395, for cases using either streamwise periodic boundary conditions or a synthetic turbulence generator. The effect of iterative, statistical and discretisation errors is investigated. For...
journal article 2020
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Schut, A. (author), Klapwijk, R.M. (author), Gielen, M.A. (author), van Doorn, Fenne (author), de Vries, M.J. (author)
In this paper, we explore the early indicators of design fixation occurring during the concept development stage of children’s design processes. This type of fixation, which we named: concept fixation, causes a blind adherence to the current (possibly unfavourable) state of a design idea. Its occurrence hampers the creative thinking processes...
journal article 2019
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Endo, A. (author), Karatsu, K. (author), Pascual Laguna, A. (author), Mirzaei, B. (author), Thoen, David (author), van Marrewijk, N.T. (author), Bosma, S. (author), Yurduseven, O. (author), Llombart, Nuria (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author)
Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science, and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled...
journal article 2019
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Endo, A. (author), Karatsu, K. (author), Bosma, S. (author), Ikarashi, S. (author), Klapwijk, T.M. (author), Llombart, Nuria (author), Pascual Laguna, A. (author), Thoen, David (author), de Visser, P.J. (author), Yurduseven, O. (author), Baselmans, J.J.A. (author)
Ultra-wideband, three-dimensional (3D) imaging spectrometry in the millimeter–submillimeter (mm–submm) band is an essential tool for uncovering the dust-enshrouded portion of the cosmic history of star formation and galaxy evolution<sup>1–3</sup>. However, it is challenging to scale up conventional coherent heterodyne receivers<sup>4</sup> or...
journal article 2019
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