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101.
A numerical procedure is presented which allows one to predict the deposition rate of microparticles suspended in a liquid flow onto the confining walls. Particle transport is not only diffusive but also affected by hydrodynamically induced lift force and reduced particle mobility. An appropriate expression for the lift‐induced migration is introduced into the numerical procedure. Its results agree quanititatively with previously published experimental data showing a significant effect of lift‐induced particle transport. Based on the numerical results algebraic correlations are obtained, which enable to calculate the particle deposition rate in situations where lift forces and mobility reduction diminishes the particle deposition rate. 相似文献
102.
103.
DI Marcel Liedermann Philipp Gmeiner Richard Niederreiter Michael Tritthart Helmut Habersack 《?sterreichische Wasser- und Abfallwirtschaft》2012,64(11-12):527-534
In this article, new and innovative methods for bedload transport monitoring and their application in the context of a restoration project on the Danube River are described. Using an adapted basket sampler, a first comprehensive monitoring campaign for measuring bedload transport on the Danube was conducted and the temporal and spatial variability was shown. The development of a methodology for tracing artificial pebbles made it possible to track 40 pebble tracers of three different sizes on the Danube over the course of an entire year. Combining the two methods it could be determined that bedload already moves at low flow conditions and that bedload transport only increases slightly or even remains constant after reaching bank-full discharge. The tracer study identified size-selective transport ?C larger sizes were moving less often and over shorter distances than smaller sizes ?C with a mean transport distance of 3?km per year for the current bed material at Bad Deutsch-Altenburg. Detailed bathymetry and the analysis of the layer succession of the riverbed using the Freeze Core methodology complemented the other insights into the processes of sediment transport on the Danube River. These methods successfully characterized gravel sheets and allowed us to make predictive statements about bed armoring. We were also able to confirm a mean bed degradation of 2?cm per year using a combination of methods. 相似文献
104.
An Al96.1–Cu3.9 to Al51.4–Cu48.6 material library was obtained by thermal co-deposition and characterized by EDX and XRD. The crystallographic data reveals the presence of Al2Cu and pure aluminium depending on the film composition and following the stoichiometry. Utilizing a scanning droplet cell setup, the zero current potential for anodization, the oxide formation factor and the dielectric constant of the oxide formed are presented with high resolution along the composition gradient.While the dielectric constant of the oxide formed remains nearly unaffected by the increasing copper content of the base material along the composition gradient, the zero current potential shows well defined steps between 6.9 and 8.5 at.% as well as between 20.9 and 26.7 at.% copper indicating an increased thickness of the native oxide present on the film. Additionally, starting around 25 at.% copper, oxygen evolution gradually superimposes the oxide growth and in turn significantly reduces the current efficiency for anodization. The formation of the intermetallic phase Al2Cu was linked to both phenomena as it promotes the growth of native oxides and current leakage by oxygen evolution. 相似文献
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106.
In this contribution, we present our new adaptive Lattice Boltzmann implementation within the Peano framework, with special focus on nanoscale particle transport problems. With the continuum hypothesis not holding anymore on these small scales, new physical effects—such as Brownian fluctuations—need to be incorporated. We explain the overall layout of the application, including memory layout and access, and shortly review the adaptive algorithm. The scheme is validated by different benchmark computations in two and three dimensions. An extension to dynamically changing grids and a spatially adaptive approach to fluctuating hydrodynamics, allowing for the thermalisation of the fluid in particular regions of interest, is proposed. Both dynamic adaptivity and adaptive fluctuating hydrodynamics are validated separately in simulations of particle transport problems. The application of this scheme to an oscillating particle in a nanopore illustrates the importance of Brownian fluctuations in such setups. 相似文献
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109.
Jan Kuneš Ryotaro Arita Philipp Wissgott Hiroaki Ikeda 《Computer Physics Communications》2010,181(11):1888-1895
We present an implementation of an interface between the full-potential linearized augmented plane wave package Wien2k and the wannier90 code for the construction of maximally localized Wannier functions. The FORTRAN code and a documentation is made available and results are discussed for SrVO3, Sr2IrO4 (including spin-orbit coupling), LaFeAsO, and FeSb2. 相似文献
110.
Philipp Riesenkampff 《Datenschutz und Datensicherheit - DuD》2008,32(4):262-265
Zusammenfassung Immer mehr Gesch?ftsinhaber in ?sterreich vertrauen im Hinblick auf die Beweisbarkeit von Ladendiebst?hlen dem hieb- und stichfesten
Beweis der systematischen und verdeckten Videoüberwachung. Eine Kamerainstallation ist aber nur unter engen rechtlichen Voraussetzungen
und nur nach einem vorherigem positiven Bescheid der ?sterreichischen Datenschutzkommission zul?ssig.
Area HR Manager Deutschland, Borealis Polymere GmbH, Burghausen 相似文献