57,230 research outputs found
[Roland Menzel]
No full textPhotograph of professor Roland Menzel taken on February 6, 1990. This image appears on the cover of the February 7, 1990, issue of the University Daily with the caption "Laser fingerprinting - Roland Menzel, director of the Texas Tech Center for Foresenic Studies, had co-developed a method of fingerprinting that will enable prints to be taken in situations not possible in the past. The fingerprints glow when treated with a chemical and illuminated with a laser." Photography by Darrel Thomas
Perspectives on learning symbolic data with connectionistic systems
No full textHammer B. Perspectives on learning symbolic data with connectionistic systems. In: Kühn R, Menzel R, Menzel W, Ratsch U, Richter MM, Stamatescu I, eds. Adaptivity and Learning. Berlin: Springer; 2003: 141-160
Unsere Heimat e. Bilderwerk für d. Heimatvertriebenen zur Erbauung u. als Weckruf zur Freude
No full textUnsere Heimat e. Bilderwerk für d. Heimatvertriebenen zur Erbauung u. als Weckruf zur Freude
No full textDie Globalisierung der epistemischen Kultur. Entwicklungstheorie und Wissensgesellschaft
No full textEvers H-D. Die Globalisierung der epistemischen Kultur. Entwicklungstheorie und Wissensgesellschaft. In: Menzel U, ed. Vom ewigen Frieden und vom Wohlstand der Nationen. Edition Suhrkamp. Vol 2173. Frankfurt am Main: Suhrkamp; 2000: 396-417
Unsere Heimat e. Bilderwerk für d. Heimatvertriebenen zur Erbauung u. als Weckruf zur Freude
No full textA Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales
No full textWe propose a new definition of the length scale in an eddy-viscosity model for large-eddy simulations (LES). This formulation extends and generalizes a previous proposal [Piomelli, Rouhi and Geurts, Proc. ETMM10, 2014], in which the LES length scale was expressed in terms of the integral length-scale of turbulence determined by the flow characteristics and explicitly decoupled from the simulation grid; this approach was named Integral Length-Scale Approximation (ILSA). As in the original ILSA, the model coefficient was determined by the user, and required to maintain a desired contribution of the unresolved, subfilter scales (SFS) to the global transport. We propose a local formulation (local ILSA) in which the model coefficient is local in space, allowing a precise control over SFS activity as a function of location. This new formulation preserves the properties of the global model; application to channel flow and backward-facing step verifies its features and accuracy
Large-eddy simulation of a separated flow with a sub-filter scale model based on the integral length-scale
No full textA new sub-filter scale model for large-eddy simulations, which uses a length-scale proportional to the integral scale of the turbulence instead of the grid resolution to parametrize the modelled stresses, will be assessed in the prediction of the flow of a boundary-layer over a rough surface, which includes separation and reattachment
Near Wall PIV-Measurements on the Windward Slope of a Hill
No full textThe turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium
Energy dissipation and flux laws for unsteady turbulence
No full textDirect Numerical Simulations of spatially periodic unsteady turbulence show that the high Reynolds number scalings of the instantaneous energy dissipation rate and interscale energy flux at intermediate wavenumbers are qualitatively different from the well-known cornerstone scalings of equilibrium turbulence where and are time-dependent rms velocity and integral length-scales. Instead, they both scale as where and are length and velocity scales characterizing initial/overall unsteady turbulence conditions
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