检索结果-南通市图书馆

symmetry Reduction and Rotational Re-quantization of Symmetric Top Molecules at Local Mode Limit

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第9期14卷 656-659页

作者： CHENG Ji-xin WANG Xiao-gang LIN Hai ZHU Qing-shi Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

The(400)stretching overtone band of AsH3 has been observed near 8029.0 cm^(-1) and analyzed in both symmetric and asymmetric top *** results indicate that the dynamical symmetry of the(400)local mode state has reduced to that of an asymmetric top and the rotational energy levels can be assigned by a set of quantum numbers J,K_(a),and K_(c).

关键词： asymmetric stretching symmetry

symmetry Breaking in Finite Volume

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第3期17卷 180-181页

作者： LIU Chuan Department of Physics Peking UniversityBeijing 100871

Spontaneous symmetry breaking is a cooperative phenomenon for systems with inGnitely many degrees of freedom and it plays an essential role in quantum Held *** O(N)model is studied within the Hamiltonian approach using an adiabatic *** is shown that the low-lying spectrum of the system in the broken phase can be understood by using the adiabatic^or Born-Oppenheimer approximation,which turns out to become an expansion in the inverse power of *** the infinite volume limit,the symmetry is broken while in the finite volume the slow rotation of the zero-momGntum mode restores the symmetry and gives rise to the rotator spectrumf which has been observed in realistic Monte Carlo simulations.

关键词： symmetry adiabatic spectrum

symmetry and Period-Adding Windows in a Modified Optical Injection Semiconductor Laser Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第1期29卷 1-4页

作者： LI Xian-Feng Andrew Y-T.Leung CHU Yan-Dong Department of Mathematics Lanzhou Jiaotong UniversityLanzhou 730070 Department of Civil and Architectural Engineering City University of Hong KongHong Kong

Hierarchical structural symmetry of periodic islands embedded in the chaotic region of modified optical injection semiconductor lasers(MOISLs)is expounded upon in phase *** onset of the bifurcation cascade shows remarkable accumulation *** cascade follows a specific period-adding ***-similarities and infinite spiral nestings shrinking beyond a certain point of the periodic hub are revealed to affirm the existence of self-organized distribution of periodicity and chaos in phase diagrams.

关键词： periodic bifurcation symmetry

symmetry Reduction,Exact Solutions and Conservation Laws of the Modified Kadomtzev-Patvishvili-ⅡEquation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第2期28卷 1-4页

作者： XIN Xiang-Peng LIU Xi-Qiang ZHANG Lin-Lin School of Mathematical Sciences Liaocheng UniversityLiaocheng 252059

Employing the modified Clarkson-Kruskal direct method,we realize the symmetries of the nonlinear(2+1)-dimensional modified Kadomtzev-Patvishvili-Ⅱ*** the given Lie symmetry,we obtain the similarity reduction and new ... 详细信息

关键词： equation symmetry symmetry

symmetry and Conserved Quantity of Tzénoff Equations for Holonomic Systems with Redundant Coordinates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第11期23卷 2924-2927页

作者：郑世旺解加芳贾利群 Department of Physics and Information Engineering Shangqiu Teachers College Shangqiu 476000 Department of Mechanics Beijing Institute of Technology Beijing 100081 College of Science Southern Yangtze University Wuxi 214122

A holonomic system with redundant coordinates can be expressed in Tzénoff equations. We concentrate on the symmetry for these Tzénoff equations under the infinitesimal transformations of groups. The notions are given for both Mei symmetry and Lie symmetry of the Tzénoff equations for holonomic system with redundant coordinates. The determination equations of symmetries for these systems have been obtained and the sumcient and necessary conditions for deriving Lie symmetries from Mei symmetries are proposed. It is shown that Hojman conserved quantities can be found from a special Lie symmetry or a Lie symmetry derived from Mei symmetry for the Tzénoff equations of holonomic systems with redundant coordinates.

关键词： Conserved Quantity symmetry Holonomic Systems

symmetry Energy Effects in a Statistical Multifragmentation Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第11期28卷 83-86页

作者： ZHANG Lei GAO Yua ZHANG Hong-Fei CHEN Xi-Meng Yu Mei-Ling LI Jun-Qing School of Information Engineering Hangzhou Dianzi UniversityHangzhou 310018 School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

The symmetry energy effects on the nuclear disintegration mechanisms of the neutron-rich system(𝐴0=200,𝑍0=78)are studied in the framework of the statistical multifragmentation model(SMM)within its micro-canonical ensemble.A modified symmetry energy term with consideration of the volume and surface asymmetry is adopted instead of the original invariable value in the standard SMM *** results indicate that as the volume and surface asymmetries are considered,the neutron-rich system translates to a fission-like process from evaporation earlier than the original standard SMM model at lower excitation energies,and its mass distribution has larger probabilities in the medium-heavy nuclei range so that the system breaks up more *** the excitation energy becomes higher,the volume and surface asymmetry lead to a smaller average multiplicity.

关键词： excitation symmetry system

symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第4期22卷 389-393页

作者：沈曼白彦魁安兴涛刘建军 College of Physics Science & Information Engineering and Hebei Advanced Thin Film Laboratory Hebei Normal University School of Sciences Hebei University of Science and Technology Physics Department Shijiazhuang University

We study theoretically the essential properties of an exciton in vertically coupled Gaussian quantum dots in the presence of an external magnetic field. The ground state energy of a heavy-hole exciton is split into four energy levels due to the Zeeman effect. For the symmetrical system, the entanglement entropy of the exciton state can reach a value of 1. However, for a system with broken symmetry, it is close to zero. Our results are in good agreement with previous studies.

关键词： exciton coupled Gaussian quantum dot symmetry entanglement entropy

symmetry Potential and Effective Mass with Consistent Three-Body Force

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第6期29卷 102-105页

作者： LI Zeng-Hua ZUO Wei Institute of Modern Physics Fudan UniversityShanghai 200433 Applied Ion Beam Physics Laboratory(Ministry of Education) Fudan UniversityShanghai 200433 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

The momentum and isospin dependence of symmetry potential and effective mass in isospin asymmetric nuclear matter is investigated in the framework of the Brueckner-Hartree-Fock approach by adopting the realistic Bonn B two-body interaction in combination with a consistent microscopic three-body *** is demonstrated that symmetry potentials at the normal density for different asymmetry parameters are in good agreement with the empirical value constrained by the experimental data,and the neutron and proton effective masses show strong isospin splitting with m*n > m*p on the whole range of asymmetry *** the end,the density dependence of the Landau mass is displayed.

关键词： force symmetry Hartree

symmetry OF TRANSLATING SOLUTIONS TO MEAN CURVATURE FLOWS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2010年第6期30卷 2006-2016页

作者：简怀玉鞠红杰刘艳楠孙伟 Department of Mathematical Sciences Tsinghua University Department of Applied Mathematics Beijing Technology and Business University Department of Mathematics Ohio State University

First, we review the authors＇ recent results on translating solutions to mean curvature flows in Euclidean space as well as in Minkowski space, emphasizing on the asymptotic expansion of rotationally symmetric solutions. Then we study the sufficient condition for which the translating solution is rotationally symmetric. We will use a moving plane method to show that this condition is optimal for the symmetry of solutions to fully nonlinear elliptic equations without ground state condition.

关键词： mean curvature flow symmetry fully nonlinear: elliptic equation