检索结果-内蒙古大学图书馆

Angular-Momentum-Dependent Orbital-Free Density Functional Theory

Physical Review Letters 2013年第6期111卷 066402-066402页

作者： Youqi Ke Florian Libisch Junchao Xia Lin-Wang Wang Emily A. Carter Department of Mechanical and Aerospace Engineering Program in Applied and Computational Mathematics and Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey 08544 USA Material Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Orbital-free (OF) density functional theory (DFT) directly solves for the electron density rather than the wave function of many electron systems, greatly simplifying and enabling large scale first principles simulations. However, the required approximate noninteracting kinetic energy density functionals and local electron-ion pseudopotentials severely restrict the general applicability of conventional OFDFT. Here, we present a new generation of OFDFT called angular-momentum-dependent (AMD)-OFDFT to harness the accuracy of Kohn-Sham DFT and the simplicity of OFDFT. The angular momenta of electrons are explicitly introduced within atom-centered spheres so that the important ionic core region can be accurately described. In addition to conventional OF total energy functionals, we introduce a crucial nonlocal energy term with a set of AMD energies to correct errors due to the kinetic energy density functional and the local pseudopotential. We find that our AMD-OFDFT formalism offers substantial improvements over conventional OFDFT, as we show for various properties of the transition metal titanium.

关键词： Angular momentum

来源：评论

学校读者我要写书评

暂无评论

Anomalous-plasmoid-ejection-induced secondary magnetic reconnection: modeling solar flares and coronal mass ejections by laser–plasma experiments

引用

High Power Laser Science and Engineering 2013年第1期1卷 11-16页

作者： Quanli Dong Dawei Yuan Shoujun Wang Xun Liu Yutong Li Xiaoxuan Lin Huigang Wei Jiayong Zhong Shaoen Jiang Yongkun Ding Bobin Jiang Kai Du Yongjian Tang Mingyang Yu Xiantu He Neng Hua Zhanfeng Qiao Kuixi Huang Ming Chen Jianqiang Zhu Gang Zhao Zhengming Sheng Jie Zhang School of Physics and Optoelectronic Engineering Ludong University Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences Research Center for Laser Fusion China Academy of Engineering Physics Institute for Fusion Theory and Simulation Physics DepartmentZhejiang University Institute for Theoretical Physics I Ruhr University Institute of Applied Physics and Computational Mathematics National Laboratory on High Power Lasers and Physics Key Laboratory for Laser Plasmas (MoE) and Department of Physics Shanghai Jiao Tong University

The driving mechanism of solar flares and coronal mass ejections is a topic of ongoing debate, apart from the consensus that magnetic reconnection plays a key role during the impulsive process. While present solar research mostly depends on observations and theoretical models, laboratory experiments based on high-energy density facilities provide the third method for quantitatively comparing astrophysical observations and models with data achieved in experimental *** this article, we show laboratory modeling of solar flares and coronal mass ejections by constructing the magnetic reconnection system with two mutually approaching laser-produced plasmas circumfused of self-generated megagauss magnetic fields. Due to the Euler similarity between the laboratory and solar plasma systems, the present experiments demonstrate the morphological reproduction of flares and coronal mass ejections in solar observations in a scaled sense,and confirm the theory and model predictions about the current-sheet-born anomalous plasmoid as the initial stage of coronal mass ejections, and the behavior of moving-away plasmoid stretching the primary reconnected field lines into a secondary current sheet conjoined with two bright ridges identified as solar flares.

关键词： laboratory astrophysics magnetic reconnection laser plasma solar flare coronal mass ejection

来源：评论

学校读者我要写书评

暂无评论

Equations of Langmuir turbulence and Zakharov equations:smoothness and approximation

引用

applied mathematics and Mechanics(English Edition) 2012年第8期33卷 1079-1092页

作者：游淑军郭柏灵宁效琦 School of Mathematical Science and Computing Technology Central South University Department of Mathematics Huaihua University Institute of Applied Physics and Computational Mathematics

A family of systems parameterized by H 〉 0, which describes the Langmuir turbulence, is considered. The asymptotic behavior of the solutions （E^H, nH） when H goes to zero is studied. The results of convergence of ... 详细信息

关键词： Zakharov equation equation of Langmuir turbulence approximation

来源：评论

学校读者我要写书评

暂无评论

Nearly hyperuniform network models of amorphous silicon

引用

Physical Review B 2013年第24期87卷 245204-245204页

作者： Miroslav Hejna Paul J. Steinhardt Salvatore Torquato Department of Physics Princeton University Princeton New Jersey 08544 USA Princeton Center for Theoretical Science Princeton University Princeton New Jersey 08544 USA Department of Chemistry Princeton Institute for the Science and Technology of Materials and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

We introduce the concept of nearly hyperuniform network (NHN) structures as alternatives to the conventional continuous random network (CRN) models for amorphous tetrahedrally coordinated solids, such as amorphous silicon (a-Si). A hyperuniform solid has a structure factor S(k) that approaches zero as the wavenumber k→0. We define a NHN as an amorphous network whose structure factor S(k→0) is smaller than the liquid value at the melting temperature. Using a novel implementation of the Stillinger-Weber potential for the interatomic interactions, we show that the energy landscape for a spectrum of NHNs includes a sequence of local minima with an increasing degree of hyperuniformity [smaller S(k→0)] that is significantly below the frozen-liquid value and that correlates with other measurable features in S(k) at intermediate and large k and with the width of the electronic band gap.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Blowing up of Solutions to the Cauchy Problem for the Generalized Zakharov System with Combined Power-Type Nonlinearities

引用

Acta Mathematica Sinica,English Series 2012年第9期28卷 1917-1936页

作者： Zai Hui GAN Bo Ling GUO Chun Xiao GUO College of Mathematics and Software Science Sichuan Normal University Institute of Applied Physics and Computational Mathematics Department of Mathematics China University of Mining and Technology Beijing

This paper deals with blowing up of solutions to the Cauchy problem for a class of general- ized Zakharov system with combined power-type nonlinearities in two and three space dimensions. On the one hand, for co = ＋oo we obtain two finite time blow-up results of solutions to the aforementioned 4 ≤ p 〈 N＋2/N-2 4 system. One is obtained under the condition a ≥ 0 and 1 ＋ 4/N or a 〈 0 and 1 〈 p 〈 1 ＋（N = 2,3）; the other is established under the condition N = 3, 1 〈 p 〈 N=2/N-2 and α（p - 3）〉 0. On the other hand, for co 〈＋∞ and α（p - 3）〉 0, we prove a blow-up result for solutions with negative energy to the Zakharov system under study.

关键词： Generalized Zakharov system blowing up combined power-type nonlinearities Lyapunov function in time

来源：评论

学校读者我要写书评

暂无评论

Testing the nonlinear stability of Kerr-Newman black holes

引用

Physical Review D 2014年第12期90卷 124088-124088页

作者： Miguel Zilhão Vitor Cardoso Carlos Herdeiro Luis Lehner Ulrich Sperhake Center for Computational Relativity and Gravitation and School of Mathematical Sciences Rochester Institute of Technology Rochester New York 14623 USA Departament de Física Fonamental & Institut de Ciències del Cosmos Universitat de Barcelona Martí i Franquès 1 E-08028 Barcelona Spain CENTRA Departamento de Física Instituto Superior Técnico Universidade de Lisboa Avenida Rovisco Pais 1 1049 Lisboa Portugal Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada Departamento de Física da Universidade de Aveiro and I3N Campus de Santiago 3810-183 Aveiro Portugal Department of Applied Mathematics and Theoretical Physics Centre for Mathematical Sciences University of Cambridge Cambridge CB3 0WA United Kingdom Theoretical Astrophysics 350-17 California Institute of Technology Pasadena California 91125 USA Department of Physics and Astronomy The University of Mississippi University Mississippi 38677 USA

The nonlinear stability of Kerr-Newman black holes (KNBHs) is investigated by performing numerical simulations within the full Einstein-Maxwell theory. We take as initial data a KNBH with mass M, angular momentum to mass ratio a and charge Q. Evolutions are performed to scan this parameter space within the intervals 0≤a/M≤0.994 and 0≤Q/M≤0.996, corresponding to an extremality parameter a/amax (amax≡M2−Q2) ranging from 0 to 0.995. These KNBHs are evolved, together with a small bar-mode perturbation, up to a time of order 120M. Our results suggest that for small Q/a, the quadrupolar oscillation modes depend solely on a/amax, a universality also apparent in previous perturbative studies in the regime of small rotation. Using as a stability criterion the absence of significant relative variations in the horizon areal radius and BH spin, we find no evidence for any developing instability.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dielectronic recombination experiment of P-like Tin on HIRFL-CSRm at Lanzhou

引用

Journal of physics: Conference Series 2014年第1期488卷

作者： W Q Xu X Ma W Q Wen X L Zhu Y Gao S L Wang P J Zhang R T Zhang B Li Y Zhang D M Zhao H P Liu V V Parkhomchuk V B Reva X D Yang J Li X M Ma T L Yan J C Yang J W Xia Y J Yuan H S Xu G Q Xiao C Y Li J G Wang L F Zhut N R Badnell Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Gansu China Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Hefei 230026 Anhui China University of Chinese Academy of Sciences Beijing 100049 China Budker Institute of Nuclear Physics Laverentyeva 11 630090 Novosibirsk Russia Institute of Applied Physics and Computational Mathematics Beijing 100088 China Department of Physics University of Strathclyde Glasgow G4 0NG UK

Total recombination rate coefficients of 112Sn35+ ions have been firstly measured by employing the electron-ion merged-beams technique on the main cooler storage ring at Lanzhou. Using an electron beam energy detuning system, we precisely tuned the relative energies from 0 to 6.0 eV between the electron beam and the ion beam (momentum spread Δp/p ~ 5 × 10−4). A multi-configuration Breit-Pauli calculation utilizing kappa-averaged relativistic orbitals has been carried-out for the recombination rate coefficients. We find that there are obvious differences between the experimental total rate coefficients and the theoretical calculations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Random Attractors of Stochastic Non-Newtonian Fluids

引用

Acta Mathematicae Applicatae Sinica 2012年第1期28卷 165-180页

作者： Chun-xiao GUO Bo-ling GUO Yong-qian HAN Department of Mathematics China University of Mining and Technology BeijingBeijing 100083China Institute of Applied Physics and Computational Mathematics Beijing 100088China

The present paper investigates the asymptotic behavior of solutions for stochastic non-Newtonian fluids in a two-dimensional domain. Firstly, we prove the existence of random attractors AH （w） in H; Secondly, we prove the existence of random attractors Ay（w） in V. Then we verify regularity of the random attractors by showing that AH（W） = Ay（w）, which implies the smoothing effect of the fluids in the sense that solution becomes eventually more regular than the initial data.

关键词： random attractors non-Newtonian fluids additive noise Ornstein-Uhlenbeck process

来源：评论

学校读者我要写书评

暂无评论

Designer spin systems via inverse statistical mechanics

引用

Physical Review B 2013年第13期88卷 134104-134104页

作者： Robert A. DiStasio, Jr. Étienne Marcotte Roberto Car Frank H. Stillinger Salvatore Torquato Department of Chemistry Princeton University Princeton New Jersey 08544 USA Department of Physics Princeton University Princeton New Jersey 08544 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

In this work, we extend recent inverse statistical-mechanical methods developed for many-particle systems to the case of spin systems. For simplicity, we focus in this initial study on the two-state Ising model with radial spin-spin interactions of finite range (i.e., extending beyond nearest-neighbor sites) on the square lattice under periodic boundary conditions. Our interest herein is to find the optimal set of shortest-range pair interactions within this family of Hamiltonians, whose corresponding ground state is a targeted spin configuration such that the difference in energies between the energetically closest competitor and the target is maximized. For an exhaustive list of competitors, this optimization problem is solved exactly using linear programming. The possible outcomes for a given target configuration can be organized into the following three solution classes: unique (nondegenerate) ground state (class I), degenerate ground states (class II), and solutions not contained in the previous two classes (class III). We have chosen to study a general family of striped-phase spin configurations comprised of alternating parallel bands of up and down spins of varying thicknesses and a general family of rectangular block checkerboard spin configurations with variable block size, which is a generalization of the classic antiferromagnetic Ising model. Our findings demonstrate that the structurally anisotropic striped phases, in which the thicknesses of up- and down-spin bands are equal, are unique ground states for isotropic short-ranged interactions. By contrast, virtually all of the block checkerboard targets are either degenerate or fall within class III solutions. The degenerate class II spin configurations are identified up to a certain block size. We also consider other target spin configurations with different degrees of global symmetries and order. Our investigation reveals that the solution class to which a target belongs depends sensitively on the nature

关键词：

来源：评论

学校读者我要写书评

暂无评论

Designer spin systems via inverse statistical mechanics. II. Ground-state enumeration and classification

引用

Physical Review B 2013年第18期88卷 184432-184432页

作者： Étienne Marcotte Robert A. DiStasio, Jr. Frank H. Stillinger Salvatore Torquato Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

In the first paper of this series [DiStasio, Jr., Marcotte, Car, Stillinger, and Torquato, Phys. Rev. B 88, 134104 (2013)], we applied inverse statistical-mechanical techniques to study the extent to which targeted spin configurations on the square lattice can be ground states of finite-ranged radial spin-spin interactions. In this sequel, we enumerate all of the spin configurations within a unit cell on the one-dimensional integer lattice and the two-dimensional square lattice up to some modest size under periodic boundary conditions. We then classify these spin configurations into those that can or cannot be unique classical ground states of the aforementioned radial pair spin interactions and found the relative occurrences of these ground-state solution classes for different system sizes. As a result, we also determined the minimal radial extent of the spin-spin interaction potentials required to stabilize those configurations whose ground states are either unique or degenerate (i.e., those sharing the same radial spin-spin correlation function). This enumeration study has established that unique ground states are not limited to simple target configurations. However, we also found that many simple target spin configurations cannot be unique ground states.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：