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Structural and Optical Properties of Thin Film β-Ta upon Exposure to Hydrogen to Asses Its Applicability as Hydrogen Sensing Material

Bannenberg, L.J. (author), Verhoeff, D. (author), Jonckers Newton, Nick (author), Thijs, M.A. (author), Schreuders, H. (author)

Here, we study the structural and optical properties of tetragonal β-tantalum-sputtered thin films both ex situ and when exposed to hydrogen, with a focus on optical hydrogen sensing applications. Using optical transmission measurements, out-of-plane and in-plane X-ray diffraction, and X-ray and neutron reflectometry, we show that thin film β...

journal article 2024

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Langs de Alumni Walk of Fame: deze historische W&S Alumnus: Prof. Dr. Ir. Hendricus J. van der Maas

van Woerkom, Paul Th.L.M. (author)

De TU Delft heeft in het kader van haar 180-jarig bestaan (1842 – 2022) in oktober 2022 een aantal nieuwe plaquettes geplaatst op haar campus langs de Mekelweg. De locatie wordt aangeduid met “Walk of Fame”. De plaquettes langs deze walk of Fame eren zowel zogenaamde TU Delft “Historische Alumni” en TU Delft “Hedendaagse Alumni”. Hierbij springt...

journal article 2023

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A level set-based interface-enriched topology optimization for the design of phononic crystals with smooth boundaries

van den Boom, S.J. (author), Abedi, Reza (author), van Keulen, A. (author), Aragon, A.M. (author)

Phononic crystals can be designed to show band gaps—ranges of frequencies whose propagation is strongly attenuated in the material. In essence, their working principle is based on destructive interference of waves reflecting from the periodic arrangement of material interfaces (i.e., Bragg scattering). Consequently, capturing accurately the...

journal article 2023

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Multimode Nonlinear Dynamics of Graphene Resonators

Keşkekler, A. (author), Bos, V. (author), Aragon, A.M. (author), Steeneken, P.G. (author), Alijani, F. (author)

Mechanical nonlinearities dominate the motion of nanoresonators already at relatively small oscillation amplitudes. Although single and coupled two-degree-of-freedom models have been used to account for experimentally observed nonlinear effects, it is shown that these models quickly deviate from experimental findings when multiple modes...

journal article 2023

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Integrated topology and controller optimization using the Nyquist curve

Delissen, A.A.T.M. (author), van Keulen, A. (author), Langelaar, Matthijs (author)

The design of high-performance mechatronic systems is very challenging, as it requires delicate balancing of system dynamics, the controller, and their closed-loop interaction. Topology optimization provides an automated way to obtain systems with superior performance, although extension to simultaneous optimization of both topology and...

journal article 2023

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Classification and analysis of common simplifications in part-scale thermal modelling of metal additive manufacturing processes

Ranjan, R. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Ayas, C. (author)

Computational process modelling of metal additive manufacturing has gained significant research attention in recent past. The cornerstone of many process models is the transient thermal response during the AM process. Since deposition-scale modelling of the thermal conditions in AM is computationally expensive, spatial and temporal...

journal article 2023

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Controlling local overheating in topology optimization for additive manufacturing

Ranjan, R. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)

A novel constraint to prevent local overheating is presented for use in topology optimization (TO). The very basis for the constraint is the Additive Manufacturing (AM) process physics. AM enables fabrication of highly complex topologically optimized designs. However, local overheating is a major concern especially in metal AM processes...

journal article 2022

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Momentary effects of Temstem, an app for voice-hearing individuals: Results from naturalistic data from 1048 users

Jongeneel, Alyssa (author), Libedinsky, Ilan (author), Reinbergen, Anouk (author), Tromp, N. (author), Delespaul, Philippe (author), Riper, Heleen (author), van der Gaag, Mark (author), van den Berg, D.A. (author)

Background: Temstem is a mobile application developed in cooperation with voice-hearing persons to help them cope with distressing voices. After psychoeducation about voice hearing, Temstem offers two functions: Silencing is a mode designed to inhibit voice activity through the processing of incompatible language; the Challenging mode...

journal article 2022

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Distributed IDA-PBC for a class of nonholonomic mechanical systems

Tsolakis, A. (author), Keviczky, T. (author)

Nonholonomic mechanical systems encompass a large class of practically interesting robotic structures, such as wheeled mobile robots, space manipulators, and multi-fingered robot hands. However, few results exist on the cooperative control of such systems in a generic, distributed approach. In this work we extend a recently developed...

journal article 2021

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Technical Note: Investigating interplay effects in pencil beam scanning proton therapy with a 4D XCAT phantom within the RayStation treatment planning system

den Boer, E. (author), Wulff, Jörg (author), Mäder, UIf (author), Engwall, Erik (author), Bäumer, Christian (author), Perko, Z. (author), Timmermann, Beate (author)

Purpose: Pencil beam scanning (PBS) for moving targets is known to be impacted by interplay effects. Four-dimensional computed tomography (4DCT)-based motion evaluation is crucial for understanding interplay and developing mitigation strategies. Availability of high-quality 4DCTs with variable breathing traces is limited. Purpose of this work...

journal article 2021

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Heat transfer from wall to dense packing structures of spheres, cylinders and Raschig rings

Moghaddam, E.M.C. (author), Foumeny, E.A. (author), Stankiewicz, A.I. (author), Padding, J.T. (author)

This paper investigates the validity of azimuthal averaging of 3D temperature fields in the analysis of lateral heat transfer in dense particle packings. This is conducted by synthetic generation of 3D packing surrogates of spheres, cylinders and Raschig rings with tube-to-pellet diameter ratio, 3 < N < 6, using an in-house Rigid Body...

journal article 2021

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Overlap-stiffened panels for optimized buckling performance under minimum steering radius constraints

Ummels, R. (author), Castro, Saullo G.P. (author)

Recent research on variable stiffness laminates have shown both numerically and experimentally that further improvement on the buckling performance is possible by incorporating overlaps that result in variable thickness profiles. We present the concept of overlap-stiffened designs that take advantage of the non-linear coupling between the tow...

journal article 2021

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Variational preparation of finite-temperature states on a quantum computer

Sagastizabal, R.E. (author), Klaver, B. A. (author), Rol, M.A. (author), Negîrneac, V. (author), Zou, X. (author), Muthusubramanian, N. (author), Beekman, M. (author), Zachariadis, C. (author), Ostroukh, V.P. (author), Haider, S.N. (author), Bruno, A. (author), DiCarlo, L. (author)

The preparation of thermal equilibrium states is important for the simulation of condensed matter and cosmology systems using a quantum computer. We present a method to prepare such mixed states with unitary operators and demonstrate this technique experimentally using a gate-based quantum processor. Our method targets the generation of...

journal article 2021

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(Fe,Co)₂(P,Si) rare-earth free permanent magnets: From macroscopic single crystals to submicron-sized particles

Yibole, H. (author), Lingling-Bao, B. (author), Xu, J. (author), Alata, H. (author), Tegus, O. (author), Hanggai, W. (author), van Dijk, N.H. (author), Brück, E.H. (author), Guillou, F. (author)

While rare-earth magnets exhibit unchallenged hard-magnetic properties, looking for alternatives based on inexpensive elements of non-critical supply remains of utmost interest. Here, we demonstrate that (Fe,Co)₂(P,Si) single crystals combine a large magnetocrystalline anisotropy (K₁ ≈ 0.9 MJ m⁻³ at 300 K),...

journal article 2021

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Radar-based sleep stage classification in children undergoing polysomnography: a pilot-study

de Goederen, R. (author), Pu, S. (author), Silos Viu, M. (author), Doan, D. (author), Overeem, S. (author), Serdijn, W.A. (author), Joosten, K. F.M. (author), Long, X. (author), Dudink, J. (author)

Study objectives: Unobtrusive monitoring of sleep and sleep disorders in children presents challenges. We investigated the possibility of using Ultra-Wide band (UWB) radar to measure sleep in children. Methods: Thirty-two children scheduled to undergo a clinical polysomnography participated; their ages ranged from 2 months to 14 years. During...

journal article 2021

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Textieltechniek en Vezeltechnologie in TH Delft Afdeling WSV

van Woerkom, Paul Th.L.M. (author), van Hooff, W.H.P.M. (author)

Tweeluik over geschiedenis en werkzaamheden van de vakgroep “Textieltechniek en Vezeltechnologie” van de afdeling der Werktuigbouwkunde en Scheepsbouwkunde (W&S, ook wel WSV) van de TH Delft. Het verscheen in de nieuwsbrief Hertz Newsletter van de huidige sectie 3Me/PME/Engineering Mechanics, edities maart-april 2020 en mei-juni 2020.

journal article 2020

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Studenten experimenteren met autonoom varen

Scheper, Wim (author)

journal article 2018

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SWZ|Maritme

journal article 2018

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Blast from the Past? Wind Assisted Ship Propulsion Shows Potential

Eggers, R. (author)

journal article 2018

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SWZ|Maritime, Maritiem Technisch Vakblad

journal article 2018