搜索结果: 31-45 共查到“理学 Diffusion”相关记录344条 . 查询时间(0.03 秒)
We consider the motion of a particle governed by a weakly random Hamiltonian flow. We identify temporal and spatial scales on which the particle trajectory converges to a spatial Brownian motion. The ...
DIFFUSION AND MIXING IN FLUID FLOW
DIFFUSION MIXING FLUID FLOW
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2015/7/14
We study enhancement of diffusive mixing on a compact Riemannian manifold by a fast incompressible flow. Our main result is a sharp description of the class of flows that make the deviation of the sol...
Wave-like solutions for nonlocal reaction-diffusion equations: a toy model
Traveling wave Wavetrains Nonlocal elliptic equations
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2015/7/14
Traveling waves for the nonlocal Fisher Equation can exhibit much more complex behaviours than for the usual Fisher equation. A striking numerical observation is that a traveling wave with minimal spe...
Traveling Wave Solutions in a Reaction-Diffusion Model for Criminal Activity
Traveling Wave Solutions Reaction-Diffusion Model Criminal Activity
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2015/7/14
We study a reaction-diffusion system of partial differential equations, which can be taken to be a basic model for criminal activity, first introduced in [3]. We show that the assumption of a populati...
Numerical diffusion for flow-aligned unstructured grids with application to estuarine modeling
unstructured grid numerical diffusion grid generation grid alignment
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2015/6/30
The benefits of unstructured grids in hydrodynamic models are well understood but in many cases lead to greater numerical diffusion compared with methods available on structured grids. The flexible na...
A Space-Time Diffusion Scheme for Peer-to-Peer Least-Squares Estimation
Least-Squares Estimation Diffusion Scheme
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2015/6/19
We consider a sensor network where each sensor takes multiple measurements of some unknown parameters, corrupted by independent Gaussian noises. The number of measurements at each node can be nite or ...
Internal Diffusion-Limited Aggregation: Parallel Algorithms and Complexity
Internal diffusion gathered circuit subset the comparator
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2014/12/22
The computational complexity of internal diffusion-limited aggregation (DLA) is examined from both a theoretical and a practical point of view. We show that for two or more dimensions, the problem of ...
Anisotropic spin diffusion in trapped Boltzmann gases
Trapped bose gas mixture dynamics grain boltzmann constant
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2014/12/20
Recent experiments in a mixture of two hyperfine states of trapped Bose gases show behavior analogous to a spin-1/2 system, including transverse spin waves and other familiar Leggett-Rice-type effects...
Decoherence and quantum walks: Anomalous diffusion and ballistic tails
Strong coupling density matrix particles lattice
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2014/12/20
The common perception is that strong coupling to the environment will always render the evolution of the system density matrix quasiclassical (in fact, diffusive) in the long time limit. We present he...
Spin diffusion in trapped gases: Anisotropy in dipole and quadrupole modes
Trapped bose gas mixture dynamics grain spin wave frequency
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2014/12/20
Recent experiments in a mixture of two hyperfine states of trapped Bose gases show behavior analogous to a spin-1/2 system, including transverse spin waves and other familiar Leggett-Rice-type effects...
Diffusion and binding of finite-size particles in confined geometries
Particles airtight environment biological technology particle size space particles interaction transmission
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2014/12/19
Describing the diffusion of particles through crowded, confined environments with which they can interact is of considerable biological and technological interest. Under conditions where the confineme...
IL-GLOBO (1.0) – integrated Lagrangian particle model and Eulerian general circulation model GLOBO: development of the vertical diffusion module
integrated Lagrangian particle model Eulerian general circulation
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2014/12/19
The development and validation of the vertical diffusion module of IL-GLOBO, a Lagrangian transport model
coupled online with the Eulerian general circulation model
GLOBO, is described. The module s...
Verification of SpacePy's radial diffusion radiation belt model
SpacePy's radial diffusion radiation belt model
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2014/12/11
Model verification, or the process of ensuring that the prescribed equations are properly solved, is a necessary step in code development. Careful, quantitative verification guides users when selectin...
We study enhancement of di®usive mixing on a compact Riemannian manifold by a fast incompressible °ow. Our main result is a sharp description of the class of °ows that make the deviation of the s...
The characterization of diffusion tensor for mid-latitude ionospheric plasma
Ionosphere Diffusion tensor Electrical conductivity
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2015/8/17
In this study, the relationship between diffusion and the electrical conductivity tensor is investigated by using the real geometry of the Earth’s magnetic field in the Northern Hemisphere for mid-lat...