Plasmon-induced magnetism of periodic nanohole arrays has been studied using transmission spectroscopy and magnetic-force microscopy. This second-order nonlinear optical effect can find numerous applications in magnet...
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Feature tracking in large data sets is traditionally an off-line, batch processing operation while virtual reality typically focuses on highly interactive tasks and applications. This paper presents an approach that u...
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The time asymptotic decay of the variance of a passive scalar in a chaotic flow is studied. Two mechanisms for this decay, which involve processes at short and long length scales, respectively, are considered. The val...
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The time asymptotic decay of the variance of a passive scalar in a chaotic flow is studied. Two mechanisms for this decay, which involve processes at short and long length scales, respectively, are considered. The validity of the short length scale mechanism, which is based on Lagrangian stretching theory, is discussed. We also investigate the regimes of applicability and observable signatures of the two mechanisms. Supporting evidence is provided by high resolution numerical experiments.
作者：
Jonathan OzikBrian R. HuntEdward OttDepartment of Physics
Department of Electrical and Computer Engineering and Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA
We consider the general character of the spatial distribution of a population that grows through reproduction and subsequent local resettlement of new population members. We present several simple one- and two-dimensi...
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We consider the general character of the spatial distribution of a population that grows through reproduction and subsequent local resettlement of new population members. We present several simple one- and two-dimensional point placement models to illustrate possible generic behavior of these distributions. We show, numerically and analytically, that these models all lead to multifractal spatial distributions of population. Additionally, we make qualitative links between our models and the example of the Earth at Night image, showing the Earth’s nighttime man-made light as seen from space. The Earth at Night data suffer from saturation of the sensing photodetectors at high brightness (“clipping”), and we account for how this influences the determined dimension spectrum of the light intensity distribution.
Strong optically excited terahertz emission has been observed from InN thin films. The emission mechanism has been determined to be photocarrier acceleration. This observation implies that InN has a bandgap smaller th...
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Suppression of Q-switch instabilities in an Er-doped waveguide laser, passively mode-locked with a saturable Bragg reflector, is demonstrated using an intracavity loss modulator, despite the strong pulse shaping per r...
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Novel ZnO nanostructures such as hollow nanospheres, nano-cuges, nanoneedles, tetrupods, nanowires, aligned nanorods and nanotubes are synthesized via thermal evaporation of ZnO and graphite powder mixtures in reduced...
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Numerical simulations of self-similar pulse evolution in a Ti:sapphire laser are presented. The results show~10 -fs pulses with energies as high as 1 microjoule should be possible. Recent experimental results support ...
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In this paper, we present a new scheme to reduce the communications requirements to send message authentication tags (MAC's), by sending the MAC's over direct sequence spread spectrum wireless channels. We gre...
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ISBN:
(纸本)0780393937
In this paper, we present a new scheme to reduce the communications requirements to send message authentication tags (MAC's), by sending the MAC's over direct sequence spread spectrum wireless channels. We greatly reduce the number of chips required by considering the chip sequence as a whole. In one example, based on the IS-95 CDMA Digital Cellular Standard, we reduce the chips needed from 3072 to 1142 by a hard decision decoding scheme, and to 728 by a soft decision decoding scheme, achieving savings of factors about three and four, respectively.
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