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Klapwijk, M.D. (author)
There is increasing attention for the effects of anthropogenic underwater radiated noise (URN) on marine fauna. This is expected to lead to regulations with respect to the maximum permitted sound emissions of ships. It is known that cavitating tip vortices, generated by ship propellers, are some of the key contributors to URN. Consequently,...
doctoral thesis 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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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), 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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Klapwijk, R.M. (author), Gielen, M.A. (author), Schut, A. (author), van Mechelen, M.P.P. (author)
The Your Turn guidebook is a step-by-step instruction for teachers (in training) to create and implement their own design projects for upper primary and lower secondary education. It provides an overview of the variety of tools for Co-design projects with children, a step-by-step guidance, advice on the approach and striking examples. Performing...
book 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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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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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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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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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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Gielen, M.A. (author), Klapwijk, R.M. (author), Schut, A. (author), van Mechelen, M.P.P. (author)
report 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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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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Sacépé, Benjamin (author), Feigel’man, Mikhail (author), Klapwijk, T.M. (author)
In order to understand the emergence of superconductivity it is useful to study the reverse process and identify the various pathways that lead to its destruction. One way is to increase the amount of disorder, as this leads to an increase in Coulomb repulsion that overpowers the attractive interaction responsible for Cooper pair formation. A...
review 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, R.M. (author), Gielen, M.A. (author), Schut, A. (author), van Mechelen, M.P.P. (author)
Het lespakket ‘Ontwerp een buitenles’ is onderdeel van de nieuwe serie ontwerplessen ‘Your Turn – aan de slag als echte ontwerpers’ voor de bovenbouw primair onderwijs en onderbouw voortgezet onderwijs. Gebaseerd op recent wetenschappelijk onderzoek, bevat de handleiding een rijkdom aan mogelijkheden voor ontwerpend leren. Met Your Turn heeft de...
book 2020
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Klapwijk, R.M. (author), Gielen, M.A. (author), Schut, A. (author), van Mechelen, M.P.P. (author)
In ‘Your Turn voor de leerkracht’ staan voor stap- voor stap instructies waarmee leerkrachten (in opleiding) een ontwerpproject over een eigen thema kunnen opzetten en uitvoeren voor de bovenbouw primair onderwijs en onderbouw voortgezet onderwijs. Hiermee doen leerlingen<br/>ervaring op met ontwerpen rond aansprekende thema’s uit de eigen...
book 2020
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Klapwijk, R.M. (author), Gielen, M.A. (author), Schut, A. (author), van Mechelen, M.P.P. (author)
Het lespakket ‘Zenna in het ziekenhuis’ is onderdeel van de nieuwe serie ontwerplessen ‘Your Turn – aan de slag als echte ontwerpers’ voor de bovenbouw primair onderwijs en onderbouw voortgezet onderwijs. Gebaseerd op recent wetenschappelijk onderzoek, bevat de handleiding een rijkdom aan mogelijkheden voor ontwerpend leren. Met Your Turn heeft...
book 2020
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