1,526 research outputs found
Electron transport through single donors in silicon
No full text-Kavli Institute of Nanoscience DelftApplied Science
New (Probabilistic) Derivation of Diaz-Metcalf and Pólya-Szegő Inequalities and Consequences
No full textClassical inequalities of Diaz - Metcalf and Pólya - Szegő are generalized to
probabilistic setting which covers the initial deterministic (both discrete and integral) variants.
From these two inequalities, by the probabilistic derivation method further well -
known inequalities are obtained (that ones by Kantorovich, Rennie and Schweitzer)
The electrons are waves: impossible interview to C.J. Davisson (1881-1958) and G.P. Thomson (1892-1975)
No full textThe author imagines to interview the Nobel Laureates in Physics of the year 1937, who turned upside-down modern physics, demonstrating the wave nature of matter. The answers of C. Davisson and G.P. Thomson are based on
the Nobel Lectures they delivered during the Nobel Prize Award Ceremony
Evaluatierapport “Powered by you”: Ontwikkeling Sustainable Energy Floor- energieopwekkende vloer
No full textOp weg naar rendabele energieopwekking door lopen. Er was een voorsprong in kennis en ervaring aangaande de techniek die nodig was een energie genererende loopvloer (de Sustainable Energy Floor – SEF) te realiseren. Specifieke aanpassingen moesten echter ontwikkeld worden in verband met de andere bewegingsvorm, de schaal die vele malen groter is en de andere installatie- en logistieke eisen. Het doel was om een pilot te doen op één of meer aansprekende locaties. Het project moest een belangrijke stap zijn op weg naar rendabele energieopwekking door lopen. Samen met de TU Delft, faculteit Industrieel Ontwerpen en Rinnic Vaude is onderzoek gedaan naar de haalbaarheid van het ontwikkelen van SEF, zijn prototypes en een pilotvloer gerealiseerd, tests gedaan en presentaties en demonstraties gegeven aan vele partijen en een breed publiek in Delft en Rotterdam. Vanwege technische knelpunten gedurende het project en de praktische haalbaarheid is er niet één grote pilot voor een langere periode gedaan, maar zijn er meerdere kortdurende pilots en tests gedaan. Het voordeel hiervan was dat we op basis van de analyses, tests en de feedback van gebruikers op verschillende versies prototypes, het ontwerp steeds verder konden verbeteren. Tenslotte heeft dit geresulteerd in het bouwen van de pilotvloer, waarmee de eindtest in De Kuip is uitgevoerd naar tevredenheid van alle betrokken partijen. Het project is succesvol afgerond en de doelstellingen zijn gehaald binnen het gestelde budget. Het project is uitgevoerd met steun van het programma Kansen voor West, wat valt onder het Europese Fonds voor Regionale Ontwikkeling.Industrial Design Engineerin
Decay of turbulence at high Reynolds numbers
No full textUsing the unique capabilities of the Variable Density Turbulence Tunnel at the Max Planck Institute for Dynamics and Self-Organization, we investigated virtually homogeneous and isotropic grid turbulence over a wide range of Reynolds numbers, , between and . The choice of pressurizable Sulfur Hexafluoride as a working gas makes it possible to reach extremely high Reynolds numbers without changing boundary conditions. Indeed, the Reynolds number we reached were higher than any previous classical grid wind-tunnel experiment. In this talk, we focus on the fundamental question of how fast turbulent energy decays once it has been created, and show that the Reynolds number plays no important role in setting the decay rate if it is high enough
Hardware and first results of TUNKA-HiSCORE
No full textAs a non-imaging wide-angle Cherenkov air shower detector array with an area of up to 100 km2, the HiSCORE (Hundred?i Square km Cosmic ORigin Explorer) detector concept allows measurements of gamma rays and cosmic rays in an energy range of 10 TeV up to 1 EeV. In the framework of the Tunka-HiSCORE project we have started measurements with a small prototype array, and planned to build an engineering array (1 km2) on the site of the Tunka experiment in Siberia. The first results and the most important hardware components are presented here. © 2013 Elsevier B.V.M. Kunnas … G.P. Rowell … et al
Wall to wall optimal transport
No full textThe calculus of variations is employed to find steady divergence-free velocity fields that maximize transport of a tracer between two parallel walls held at fixed concentration for one of two constraints on flow strength: a fixed value of the kinetic energy or a fixed value of the enstrophy (the mean square rate of strain in this situation). The optimizing flows realize upper limits on convective transport in this scenario. We interpret the results in the context of buoyancy-driven Rayleigh–Bénard convection problems that satisfy the flow intensity constraints, enabling us to investigate how optimal transport scalings compare with upper bounds on Nu expressed as a function of the Rayleigh number Ra
Experiments and DNS of a round jet with turbulent inlet
No full textExperimental and Direct Numerical Simulation data of a turbulent round jet fed by a turbulent pipe are compared in the near field. The Reynolds number achieved in both the experiment and the simulation, Re = 16000, allows a direct comparison of both the average and the fluctuating velocity statistics. In the experiments the jet is fed with olive oil droplets with a Stokes number St ' 1 whose dynamics is compared against the corresponding DNS simulation to asses the ability of particles to reproduce high order turbulence statistics and to asses the accumulation properties of inertial particles in the near field
The Tunka - Multi-component EAS detector for high energy cosmic ray studies
No full textThe EAS Cherenkov array Tunka-133, with about 3 km2 sensitive area, has been installed in the Tunka Valley, Siberia. The accessible energy range is 1015-1018 eV. In this contribution, a description of the array and main results obtained so far are presented. A current update of the array includes the deployment of scintillation stations, radio antennas, as well as optical stations. The deployments of these optical stations are the first step towards Tunka-HiSCORE, a wide-angle, large field-of-view gamma-ray telescope. © 2013 Elsevier B.V.S.F. Berezhnev...G.P. Rowell...et al
Rapport naar aanleiding van de werking eener proefinrichting tot verlaging van de waterspiegel door middel van bronbemaling en de daarmede verkregen uitkomsten, opgemaakt dor den ingenieur van den Rijkswaterstaat G.P. Nijhoff
No full textPrototype proef voor de bronbemaling bij de sluis van Linne
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