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Macroscopic Electromagnetic Response of Arbitrarily Shaped Spatially Dispersive Bodies formed by Metallic Wires
Macroscopic Electromagnetic Response Arbitrarily Shaped Spatially Dispersive Bodies Metallic Wires Computational Physics
2012/5/29
In media with strong spatial dispersion the electric displacement vector and the electric field are typically linked by a partial differential equation in the bulk region. The objective of this work i...
Geometric numerical schemes for the KdV equation
KdV equation symplectic scheme multi-symplectic scheme solitonic gas wave turbulence
2012/5/29
Geometric discretizations that preserve certain Hamiltonian structures at the discrete level has been proven to enhance the accuracy of numerical schemes. In particular, numerous symplectic and multi-...
Asymptotic Derivation and Numerical Investigation of Time-Dependent Simplified Pn Equations
Asymptotic Derivation Numerical Investigation Time-Dependent Simplified Pn Equations Computational Physics
2012/5/28
The steady-state simplified Pn (SPn) approximations to the linear Boltzmann equation have been proven to be asymptotically higher-order corrections to the diffusion equation in certain physical system...
Non-Universality in Semi-Directed Barabasi-Albert Networks
General BA directed BA undirected BA Neighbors Fortran programs
2012/5/17
In usual scale-free networks of Barabasi-Albert type, a newly added node selects randomly m neighbors from the already existing network nodes, proportionally to the number of links these had before. T...
Towards an efficient multiscale modeling of low-dimensional reactive systems: study of numerical closure procedures
efficient multiscale modeling low-dimensional reactive systems numerical closure procedures Computational Physics
2012/4/27
In this paper, we present a study on how to develop an efficient multiscale simulation strategy for the dynamics of chemically active systems on low-dimensional supports. Such reactions are encountere...
Exact diagonalization of the Hubbard model on graphics processing units
Hubbard model exact diagonalization GPU CUDA
2012/4/25
We solve the Hubbard model with the exact diagonalization method on a graphics processing unit (GPU). We benchmark our GPU program against a sequential CPU code by using the Lanczos algorithm to solve...
Optimal box-covering algorithm for fractal dimension of complex networks
Optimal box-covering algorithm fractal dimension complex networks Computational Physics
2012/4/24
The self-similarity of complex networks is typically investigated through computational algorithms the primary task of which is to cover the structure with a minimal number of boxes. Here we introduce...
On Core and Curvature Corrections used in Straight-Line Vortex Filament Methods
Core and Curvature Corrections Straight-Line Vortex Filament Methods Computational Physics
2012/4/24
The convergence characteristics of two viscous core corrections as used in straight-line segmentation methods are rigorously analysed. These are \emph{curvature corrections} that account for the induc...
SPICE model of memristive devices with threshold
SPICE model memristive devices threshold Computational Physics
2012/4/24
Although memristive devices with threshold voltages are the norm rather than the exception in experimentally realizable systems, their SPICE programming has not yet been suggested. Here, we show how t...
Validity of Viscous Core Correction Models for Self-Induced Velocity Calculations
Validity of Viscous Core Correction Models Self-Induced Velocity Calculations Computational Physics
2012/4/20
Viscous core correction models are used in free wake simulations to remove the infinite velocities at the vortex centreline. It will be shown that the assumption that these corrections converge to the...
A molecular simulation analysis of producing monatomic carbon chains by stretching ultranarrow graphene nanoribbons
molecular simulation analysis monatomic carbon chains ultranarrow graphene nanoribbons Computational Physics
2012/4/20
Atomistic simulations were utilized to develop fundamental insights regarding the elongation process starting from ultranarrow graphene nanoribbons (GNRs) and resulting in monatomic carbon chains (MAC...
Finding the ground state of a fermionic Hamiltonian using quantum Monte Carlo is a very difficult problem, due to the Fermi sign problem. While still scaling exponentially, full configuration-interact...
Direct Minimization for Ensemble Electronic Structure Calculations
Direct Minimization Ensemble Electronic Structure Calculations Computational Physics
2012/4/19
We consider a direct optimization approach for ensemble density functional theory electronic structure calculations. The update operator for the electronic orbitals takes the structure of the Stiefel ...
Direct minimization of electronic structure calculations with Householder reflections
Direct minimization of electronic structure calculations Householder reflections Computational Physics
2012/4/19
We consider a minimization scheme based on the Householder transport operator for the Grassman manifold, where a point on the manifold is represented by a m x n matrix with orthonormal columns. In par...
GPGPU for orbital function evaluation with a new updating scheme
GPGPU orbital function evaluation new updating scheme Computational Physics
2012/4/19
We accelerated an {\it ab-initio} QMC electronic structure calculation by using GPGPU. The bottleneck of the calculation for extended solid systems is replaced by CUDA-GPGPU subroutine kernels which b...