搜索结果: 61-75 共查到“知识库 计算物理学”相关记录368条 . 查询时间(3.902 秒)
An equation-free approach to coarse-graining the dynamics of networks
equation-free approach coarse-graining dynamics of networks
2012/2/29
We propose and illustrate an approach to coarse-graining the dynamics of evolving networks (networks whose connectivity changes dynamically). The approach is based on the equation-free framework: shor...
Dynamical Magnetic and Nuclear Polarization in Complex Spin Systems: Semi-magnetic II-VI Quantum Dots
Dynamical Magnetic Nuclear Polarization Complex Spin Systems Semi-magnetic II-VI Quantum Dots
2012/2/29
Dynamical magnetic and nuclear polarization in complex spin systems is discussed on the example of transfer of spin from exciton to the central spin of magnetic impurity in a quantum dot in the presen...
High Bandwidth Pickup Design for Bunch Arrival-time Monitors for Free-Electron Laser
High Bandwidth Pickup Design Bunch Arrival-time Monitors Free-Electron Laser
2012/2/29
In this paper, we present the design and realization of high bandwidth pickup electrodes with a cutoff frequency above 40 GHz. The proposed cone-shaped pickups are part of a bunch arrival-time monitor...
Mod-CSA: Modularity optimization by conformational space annealing
Mod-CSA Modularity optimization conformational space annealing
2012/2/29
We propose a new modularity optimization method, Mod-CSA, based on stochastic global optimization algorithm, conformational space annealing (CSA). Our method outperforms simulated annealing in terms o...
Forward and Adjoint Sensitivity Computation of Chaotic Dynamical Systems
Sensitivity analysis linear response adjoint equation unsteady adjoint chaos statistical average
2012/2/29
This paper describes a forward algorithm and an adjoint algorithm for computing sensitivity derivatives in chaotic dynamical systems, such as the Lorenz attractor. The algorithms compute the derivativ...
First-principles Analysis of Photo-current in Graphene PN Junctions
First-principles Analysis Photo-current Graphene PN Junctions
2012/2/29
We report a first principles investigation of photocurrent generation by graphene PN junctions. The junctions are formed by either chemically doping with nitrogen and boron atoms, or by controlling ga...
Convergence of many-body wavefunction expansions using a plane wave basis: from the homogeneous electron gas to the solid state
Convergence many-body wavefunction expansions plane wave basis homogeneous electron gas solid state
2012/2/29
Using the finite simulation-cell homogeneous electron gas (HEG) as a model, we investigate the convergence of the correlation energy to the complete basis set (CBS) limit in methods utilising plane-wa...
Solving the stationary Liouville equation via a boundary element method
Statistical energy analysis high-frequency asymptotics Liouville equation boundary element method
2012/2/29
Intensity distributions of linear wave fields are, in the high frequency limit, often approximated in terms of flow or transport equations in phase space. Common techniques for solving the flow equati...
基于颜色的206个星系的星族年龄与金属丰度研究
星系 星族年龄 金属丰度 颜色
2012/11/6
基于颜色分别采用单星星族模型和双星星族模型对206个星系的年龄和金属丰度进行了确定,并将2种结果和Gallazzi等人用谱指数得到的结果进行了比较.结果表明:样本星系的年龄比较老,金属丰度比较高;使用双星星族模型拟合得到的星族年龄和金属丰度比单星星族的偏大;使用颜色拟合得到的星族年龄比谱指数的偏小,金属丰度偏大.
Extension of the Finite Integration Technique including dynamic mesh refinement and its application to self-consistent beam dynamics simulations
Finite Integration Technique, Adaptive Dynamic Mesh Refinement, Particle-In-Cell
2011/9/6
An extension of the framework of the Finite Integration Technique (FIT) including dynamic and adaptive mesh refinement is presented. After recalling the standard formulation of the FIT, the proposed m...
A Comparison of Cosmological Codes: Properties of Thermal Gas and Shock Waves in Large Scale Structures
galaxy: clusters, general – methods: numerical – intergalactic medium – largescale structure of Universe
2011/9/13
Cosmological hydrodynamical simulations are a valuable tool for understanding the growth of large scale structure and the observables connected with this. Yet, comparably little attention has been giv...
Optimal, scalable forward models for computing gravity anomalies
Optimal scalable forward models computing gravity anomalies
2011/8/18
Abstract: We describe three approaches for computing a gravity signal from a density anomaly. The first approach consists of the classical "summation" technique, whilst the remaining two methods solve...
Explicit Bounds for Entropy Concentration under Linear Constraints
maximum entropy concentration bounds linear constraints tolerances
2011/8/19
Abstract: Consider the construction of an object composed of $m$ parts by distributing $n$ units to those parts. For example, say we are assigning $n$ balls to $m$ boxes. Each assignment results in a ...
Parallel-tempering cluster algorithm for computer simulations of critical phenomena
Parallel-tempering cluster algorithm computer simulations critical phenomena
2011/8/18
Abstract: In finite-size scaling analyses of Monte Carlo simulations of second-order phase transitions one often needs an extended temperature range around the critical point. By combining the paralle...
Computation of electron quantum transport in graphene nanoribbons using GPU
Green's function formalism GPU graphene ribbon
2011/8/11
Abstract: The performance potential for simulating quantum electron transport on graphical processing units (GPUs) is studied. Using graphene ribbons of realistic sizes as an example it is shown that ...