Searched for: mods_originInfo_publisher_s%3A%22IOP%255C+Publishing%22
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Carvalho, I. (author), Schut, H. (author), Fedorov, A. (author), Luzginova, N. (author), Desgardin, P. (author), Sietsma, J. (author)Reduced Activation Ferritic/Martensitic steels are being extensively studied because of their foreseen application in fusion and Generation IV fission reactors. To mimic neutron irradiation conditions, Eurofer97 samples were implanted with helium ions at energies of 500 keV and 2 MeV and doses of 5x1015-1016 He /cm2, creating atomic...journal article 2013
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Zhang, S. (author), Schut, H. (author), Brück, E. (author), Van der Zwaag, S. (author), Van Dijk, N.H. (author)The role of deformation-induced defects and carbon addition on the copper precipitation during aging at 550 oC is investigated in high-purity Fe-Cu-B-N-C alloy samples by Coincidence Doppler Broadening. In samples with 0% and 8% cold pre-strain, the influence of tensile pre-deformation on the precipitation kinetics of copper is studied. The...journal article 2013
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Mandai, S. (author), Charbon, E. (author)We present a 4 X 4 array of digital silicon photomultipliers (D-SiPMs) capable of timestamping up to 48 photons per D-SiPM and we show the advantage of generating multiple timestamps in the context of positron emission tomography (PET). The D-SiPMs have a pitch of 800 ?m and comprise 416 pixels each; the timing resolution achieved by the SiPMs...journal article 2013
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Schaafsma, M.C. (author), Starmans, H. (author), Berrier, A. (author), Gómez Rivas, J. (author)We demonstrate experimentally the resonant extinction of terahertz (THz) radiation by a single plasmonic bowtie antenna, formed by two n-doped Si monomers with a triangular shape and facing apexes. This demonstration is achieved by placing the antenna at the output aperture of a conically tapered waveguide, which enhances the intensity of the...journal article 2013
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Alos-Palop, M. (author), Tiwari, R.P. (author), Blaauboer, M. (author)We investigate adiabatic quantum pumping of ballistic Dirac fermions on the surface of a strong three-dimensional topological insulator. Two different geometries are studied in detail, a normal metal–ferromagnetic–normal metal (NFN) junction and a ferromagnetic–normal metal–ferromagnetic (FNF) junction. Using a scattering matrix approach, we...journal article 2012
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Kim, M.S. (author), Assafrao, A.C. (author), Scharf, T. (author), Wachters, A.J.H. (author), Pereira, S.F. (author), Urbach, H.P. (author), Brun, M. (author), Olivier, S. (author), Nicoletti, S. (author), Herzig, H.P. (author)We report on the experimental and numerical demonstration of immersed submicron-size hollow focused spots, generated by structuring the polarization state of an incident light beam impinging on a micro-size solid immersion lens (?-SIL) made of SiO2. Such structured focal spots are characterized by a doughnut-shaped intensity distribution, whose...journal article 2012
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De Groot, P.C. (author), Ashhab, S. (author), Lupascu, A. (author), DiCarlo, L. (author), Nori, F. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author)We present a theoretical analysis of the selective darkening method for implementing quantum controlled-NOT (CNOT) gates. This method, which we have recently proposed and demonstrated, consists of driving two transversely coupled quantum bits (qubits) with a driving field that is resonant with one of the two qubits. For specific relative...journal article 2012
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El Gawhary, O. (author), Schilder, N.J. (author), Da Costa Assafrao, A. (author), Pereira, S.F. (author), Urbach, H.P. (author)It was predicted a few years ago that a medium with negative index of refraction would allow for perfect imaging. Although no material has been found so far that behaves as a perfect lens, some experiments confirmed the theoretical predictions in the near-field, or quasi-static, regime where the behaviour of a negative index medium can be...journal article 2012
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Bonneau, D. (author), Engin, E. (author), Dorenbos, S.N. (author), Zwiller, V. (author)Integrated quantum photonic waveguide circuits are a promising approach to realizing future photonic quantum technologies. Here, we present an integrated photonic quantum technology platform utilizing the silicon-oninsulator material system, where quantum interference and the manipulation of quantum states of light are demonstrated in components...journal article 2012
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Greidanus, A.J. (author), Delfos, R. (author), Westerweel, J. (author)We use a Taylor-Couette facility to study the drag reducing effects of commercial surface products at high shear Reynolds numbers (Res) under perfect couter-rotating conditions (riwi=rowo). The correlation between torque contribution of the von Karman flow and shear Reynolds number is investigated. At this moment no significant drag changes are...conference paper 2011
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Harleman, M.J.W. (author), Delfos, R. (author), Van Terwisga, T.J.C. (author), Westerweel, J. (author)Dispersion and preferential concentration of small, low Stokes number bubbles in horizontal turbulent channel flow is studied by DNS and experiments. A DNS of turbulent channel flow at Re = 360 with Lagrangian tracking of one-way coupled bubbles (d < n, St = 1.3×10?3) shows that equilibrium bubble concentration profiles can be described by a...conference paper 2011
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Ruiz-Ripoll, M.L. (author), Schut, H. (author), Van Dijk, N.H. (author), Alderliesten, R.C. (author), Van der Zwaag, S. (author), Benedictus, R. (author)We have investigated the evolution of damage during fatigue loading in Al–Cu 2024-T3 alloys using the positron annihilation Doppler Broadening (DB) technique. This technique enables us to monitor in a non destructive way, at the atomic and vacancy level, the formation of deformation defects and their interaction with solute atoms at selected...conference paper 2011
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- Kenjeres, S. (author) conference paper 2011
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Warncke, N.G.W. (author), Delfos, R. (author), Ooms, G. (author), Westerweel, J. (author)In this work we study the preferential concentration of small particles in the turbulent wake behind a spherical-cap object. We present a model predicting the mean particle concentration in the near-wake as a function of the characteristic Stokes number of the problem, the turbulence level and the Froude number. We compare the model with our...conference paper 2011
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Boersma, B.J. (author)In this paper we will present results of several direct numerical simulations of turbulent pipe flow. The highest Reynolds number simulated in this study was 61, 000. Our numerical model uses Fourier expansions in axial and circumferential directions and 6th order staggered compact finite difference in the wall normal direction. Apart form...conference paper 2011
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Kenjeres, S. (author), Wrobel, W. (author), Pyrda, L. (author), Fornalik-Wajs, E. (author), Szmyd, J.S. (author)We performed combined experimental and numerical studies of the flow and heat transfer of a paramagnetic fluid inside a differentially heated cubical enclosure subjected to various strong non-uniform magnetic field gradients. Two different heating scenarios are considered: unstable (heated from below) and stable (heated from above) initial...conference paper 2011
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Rogers, E.G. (author), Dorenbos, P. (author), Van der Kolk, E. (author)The basic optical, electrical and chemical properties of the binary divalent, trivalent and tetravalent lanthanide (Ln = La, . . . , Lu) halides (F, Cl, Br and I), chalcogenides (O, S, Se and Te) and pnictides (N, P, As and Sb) were studied using an empirical model that utilizes the systematic behaviour in the energy difference between the...journal article 2011
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Kochetov, R. (author), Korobko, A.V. (author), Andritsch, T. (author), Morshuis, P.H.F. (author), Picken, S.J. (author), Smit, J.J. (author)In this paper the thermal conductivity of epoxy-based composite materials is analysed. Two and three-phase Lewis–Nielsen models are proposed for fitting the experimental values of the thermal conductivity of epoxy-based polymer composites. Various inorganic nano- and microparticles were used, namely aluminium oxide, aluminium nitride, magnesium...journal article 2011
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Robledo, L. (author), Bernien, H. (author), Van der Sar, T. (author), Hanson, R. (author)We investigate spin-dependent decay and intersystem crossing (ISC) in the optical cycle of single negatively charged nitrogen-vacancy (NV) centres in diamond. We use spin control and pulsed optical excitation to extract both the spin-resolved lifetimes of the excited states and the degree of optically induced spin polarization. By optically...journal article 2011
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Sadeghian, H. (author), Goosen, H. (author), Bossche, A. (author), Thijsse, B. (author), Van Keulen, F. (author)Recent measurements have indicated that the elastic behaviour of silicon nanocantilevers and nanowires is size-dependent. Several theoretical models have been proposed to explain this phenomenon, mainly focused on surface stress effects. However, discrepancies are found between experiments and theories, indicating that there could be other...journal article 2011
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