نتایج جستجو برای: dual photon energy absorptiometry dpa
تعداد نتایج: 861485 فیلتر نتایج به سال:
We derive the electromagnetic energy density in a chiral metamaterial consisting of uncoupled single-resonance helical resonators. Both the lossless and absorptive cases are studied, and the energy density is shown to be positively definite. The key relation making the derivation successful is the proportionality between the magnetization and the rate of change of the electric polarization of t...
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a Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC, 1060 Vienna, Austria b Vienna University of Technology, Institute of Materials Chemistry, Getreidemarkt 9/165-PC, 1060 Vienna, Austria c University of Innsbruck, Institute of Physical Chemistry, Innrain 80-82, 6020 Innsbruck, Austria d Fritz Haber Institute of the Max Planck Society, Dep...
We describe a method for automatic detection and localisation of vertebrae in clinical images that was designed to avoid making a-priori assumptions of how many vertebrae are visible. Multiple Random Forest regressors were trained to identify vertebral end-plates, providing estimates of both the location and pose of the vertebrae. The highest-weighted responses from each model were combined usi...
The quantized Dirac field is known, by a result of Fewster and Verch, to satisfy a Quantum Weak Energy Inequality (QWEI) on its averaged energy density along time-like curves in arbitrary four-dimensional globally hyperbolic spacetimes. However, this result does not provide an explicit form for the bound. By adapting ideas from the earlier work, we give a simplified derivation of a QWEI for the...
Article history: Received 12 February 2009 Accepted after revision 2 February 2010 Available online 6 March 2010 Presented by Gérard Iooss
Solar energy represents one of the most abundant and yet least harvested sources of renewable energy. In recent years, tremendous progress has been made in developing photovoltaics that can be potentially mass deployed. Of particular interest to cost-effective solar cells is to use novel device structures and materials processing for enabling acceptable efficiencies. In this regard, here, we re...
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