23,688 Hits in 7.2 sec

Page 1643 of Mathematical Reviews Vol. , Issue 94c [page]

1994 Mathematical Reviews  
in nearly-constant parallel time.  ...  We present a randomized preprocess- ing algorithm that runs in O(iog* n) time with high probability, using an optimal number of processors on a CRCW PRAM; each query can be processed in constant time by  ... 

Crosstalk in Ti:LiNbO3directional coupler switches caused by Ti concentration fluctuations

L. McCaughan, K. Choquette
1986 IEEE Journal of Quantum Electronics  
We have observed random fluctuations in the local Ti concentration profiles of Ti-diffused LiNbOs waveguides.  ...  ., crosstalk) and other nonideal characteristics observed in LiNb03 optical switches. We also demonstrate by calculation a new device configuration for eliminating this source of crosstalk.  ...  Glover in making the electron microprobe measurements and Dr. S. Korotky for valuable discussions.  ... 
doi:10.1109/jqe.1986.1073049 fatcat:oumcsglxfnb55goz6eqvfrpape

Parallel and SIMD Optimization of Image Feature Extraction

Ming Qi, Guangzhong Sun, Guoliang Chen
2011 Procedia Computer Science  
In this paper, we introduce some parallel and SIMD optimizations of image-feature extraction to overcome the disadvantages of original methods.  ...  And especially, for some hot point, we use SIMD logical operations to eliminate the random conditional branches which cannot be effectively predicted by CPU Branch Prediction.  ...  As we can see in next section, all these problems can be overcome. We can eliminate the random conditional branches, and they can be done in a SIMD way, at least four pixels at a time.  ... 
doi:10.1016/j.procs.2011.04.051 fatcat:jq6o6pxjpnbbxl62wt37xjerc4


1990 Le Journal de Physique Colloques  
In the random-hopping-migration model, when deposited atom can hop more than 28 times, the step density oscillation can be obtained.  ...  The step density can oscillate with one monolayer growth period when an impinged atom could hop more than 10 times in one direction even at OK.  ...  It was found that in the one-direction model the amplitude of step density oscillation is nearly constant and the minima and the maxima did not change.  ... 
doi:10.1051/jphyscol:19901132 fatcat:itmpfxid3zhpvmmwub4w7wtjsq

Stick-slip fluctuations in granular drag

I. Albert, P. Tegzes, R. Albert, J. G. Sample, A. -L. Barabási, T. Vicsek, B. Kahng, P. Schiffer
2001 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
We study fluctuations in the drag force experienced by an object moving through a granular medium.  ...  These results imply that the drag force originates in the bulk properties of the granular sample.  ...  For smaller grains d g Ͻ1.6 mm and HϽH c Ϸ80 mm the fluctuations are quite periodic, i.e., F(t) increases continuously to a nearly constant value of F max and then collapses with a nearly constant drop  ... 
doi:10.1103/physreve.64.031307 pmid:11580332 fatcat:oesw3mksfrbu3o3ese3fh5oayy

Resonance control

M. A. Noginov
2008 Nature Photonics  
In ensembles of randomly shaped and oriented scatterers, the diffusion coefficients are, as a rule, nearly constant within the gain spectral bands.  ...  of just two parallel mirrors.  ... 
doi:10.1038/nphoton.2008.114 fatcat:x5wp7sgnqnalzc4g56simacwiq

Quasi-Two-Dimensional Diffusive Random Laser Action

Stefano Gottardo, Stefano Cavalieri, Oleg Yaroshchuk, Diederik S. Wiersma
2004 Physical Review Letters  
We report on random lasing in a disordered system in which the multiple scattering feedback mechanism can be switched from a three-dimensional random walk to a quasi-two-dimensional type of transport.  ...  The phenomenon is observed in dye-doped polymer dispersed liquid crystals and makes use of the strong scattering anisotropies in these materials.  ...  The temperature range of the nematic phase is different PRL 93, FIG. 1 . 1 The diffusion constant in function of the applied electric field measured with a time-resolved technique.  ... 
doi:10.1103/physrevlett.93.263901 pmid:15697980 fatcat:6kgxg4bmkncldnlxzyw6ruyzkm

Modeling Jupiter's decametric modulation lanes

Kazumasa Imai, Liyun Wang, Thomas D. Can
1997 Journal of Geophysical Research  
The frequency-time plot is thus in the form of characteristically sloping modulation lanes.  ...  Within a received bandwidth at Earth, some frequency components will have arrived from intensity lobe maxima and others from lobe minima.  ...  I.) was in residence at the University of Florida, Department of Astronomy, as a  ... 
doi:10.1029/96ja03960 fatcat:a7qggob66vgk7esxe63hjfmpoy

Guiding Chiral Self-Propellers in a Periodic Potential

Amir Nourhani, Vincent H. Crespi, Paul E. Lammert
2015 Physical Review Letters  
Orientational and translational diffusion produce new types of drift absent in the noise-free case.  ...  Recently discovered self-motile micro/nano-particles express dynamical chirality, i.e. that which originates in motion, not structure.  ...  Even if, in the very long run, a swimmer switches chirality from time to time due to random perturbations flipping it over, there will still be a long-term net drift in the x direction as long as either  ... 
doi:10.1103/physrevlett.115.118101 pmid:26406856 fatcat:4ofomyjgw5f3lhhuxzxfj7eqd4

Potential energy surface of H2O on Al{111} and Rh{111} from theoretical methods

Víctor A. Ranea
2012 Journal of Chemical Physics  
In the only minimum found, the water molecule is monocoordinated to the surface via the oxygen atom (top configuration) with its plane nearly parallel to the surface.  ...  Along the investigated minimum energy pathways, no strong preferential orientation of the water dipole was found, as long as the molecular plane is nearly parallel to the surface.  ...  of the time on the top sites and the diffusion process is described by a random walk process at low temperature and low coverage.  ... 
doi:10.1063/1.4767766 pmid:23206022 fatcat:ltnloto5wfafhpm6hbg4qhxt64

Ice fabric evolution process understood from anisotropic distribution of a-axis orientation on the GRIP (Greenland) ice core

Atsushi Miyamoto, Hitoshi Shoji, Akira Hori, Takeo Hondoh, Henrik B. Clausen, Okitsugu Watanabe
2005 Annals of Glaciology  
We find that the a axes of each grain also tend to cluster close to nearly a mutual direction.  ...  To better understand how ice fabric evolves in polar ice sheets, we use X-ray diffraction to measure ice crystal orientations.  ...  ACKNOWLEDGEMENTS This work was supported by a grant-in-aid for JSPS Fellows from the Japan Society for the Promotion of Science and Creative Scientific Research (No. 14GS0202) from the Japanese Ministry  ... 
doi:10.3189/172756405781812501 fatcat:nukf45nro5a4xllylxifoiyasy

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

Ruth Keppler, Klaus Ullemeyer, Jan H. Behrmann, Michael Stipp, Robert M. Kurzawski, Tomas Lokajíček
2015 Tectonophysics  
of velocity maxima.  ...  Crystallographic preferred orientations (CPO) of rocks from an exhumed subduction channel of the Alpine orogen were determined using time-of-flight neutron diffraction.  ...  Garnet, the acoustically isotropic major constituent of the eclogites, has nearly random distribution, as exemplified by two garnet pole figures of samples TW33 and MS112 (Fig. 7 ).  ... 
doi:10.1016/j.tecto.2015.02.011 fatcat:tirfqdb3lrc2zo2nuocortf7da

Near-Field Intensity Correlations in Semicontinuous Metal-Dielectric Films

K. Seal, A. K. Sarychev, H. Noh, D. A. Genov, A. Yamilov, V. M. Shalaev, Z. C. Ying, H. Cao
2005 Physical Review Letters  
Significant differences in the near-field intensity correlations between metallic and dielectric random systems are demonstrated.  ...  The concentration of metal particles on a dielectric surface is varied over a wide range to control the scattering strength.  ...  Its value is nearly constant for p < p c and increases slightly for p > p c .  ... 
doi:10.1103/physrevlett.94.226101 pmid:16090411 fatcat:oaxmymdg75bkxeou35x7zkz5zy


P. Tooprakai, A. Seripienlert, D. Ruffolo, P. Chuychai, W. H. Matthaeus
2016 Astrophysical Journal  
The initial dropout pattern in particle trajectories is relatively insensitive to particle energy, though the energy affects the pattern's evolution with time.  ...  Among random-phase realizations of two-dimensional (2D) turbulence, a spherical harmonic expansion can generate homogeneous turbulence over a sphere, but a 2D fast Fourier transform (FFT) locally mapped  ...  For greater clarity and generality, we express the time ranges in terms of the pathlength, s=vt+0.1 au, where v is the particle speed (which is constant in a static magnetic field, as used in our simulations  ... 
doi:10.3847/0004-637x/831/2/195 fatcat:bkccxzl3knb4leosv4my7dcdkq

Interaction between randomly charged rods and plates: Energy landscapes, stick slip, and recognition at a distance

Sergei Panyukov, Yitzhak Rabin
1997 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
We consider arbitrary relative displacements of two parallel rigid rods and of two parallel rigid plates, and calculate the statistical properties of the resulting energy landscape, such as the distribution  ...  We study the case of perfectly correlated charge distributions on the two objects, and show that the presence of long range forces may lead to prealignment of the objects, even before contact.  ...  At the same time, new shallow minima appear, and grow in depth as h is reduced.  ... 
doi:10.1103/physreve.56.7053 fatcat:rf4ku6betbafhopudpgtml7zw4
« Previous Showing results 1 — 15 out of 23,688 results