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Wave-packet method for instability of three-dimensionalboundary layer of swept wing

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Chinese Science Bulletin 1998年第6期43卷 461-464页

作者： ZHAO Gengfu department of physics, Tianjin university, Tianjin 300072, china department of physics Tianjin University Tianjin China

A wave-packet method is proposed to study evolution the behavior of disturbances in 3-D boundary layer on a swept plate. It is proved that the constant-phase lines are equivalent to the streaks observed in flow-visual... 详细信息

关键词： swept plate wave packet structure of streaks.

The information entropy of a static dilaton black hole

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Science china(physics,Mechanics & Astronomy) 2008年第2期51卷 113-125页

作者： LIU ChengZhou Institute of Theoretical physics, Binzhou university, Binzhou 256600, china department of physics, Beijing Normal university, Beijing 100875, china Institute of Theoretical physics Binzhou University Binzhou China department of physics Beijing Normal University Beijing China

In accordance with holographic principle, by calculating the statistical entropy of the quantum field just at the event horizon of the Garfinkle-Horowitz-Strominger dilaton black hole, the information entropy of the black hole was investigated and the Bekenstein-Hawking formula was obtained. The results show that black hole entropy is identical with the statistical entropy of the quantum field at the horizon. Using the generalized uncertainty relation, the divergence of the state density near the event horizon in usual quantum field theory was removed, and the cutoffs and the little mass approximation in the heat gas method of black hole entropy were avoided. Thus, the microstates of the massive scalar field just at the event horizon of the static dilaton black hole were studied directly and a description on holograph principle was presented. By using residue theorem, the integral difficulty in the calculation was overcome, and the information entropy and the Bekenstein-Hawking formula were obtained quantitatively. Compared with the black hole entropy from the loop quantum gravity, the consistency of methods and results of calculating black hole entropy in non-commutative quantum field theory and loop quantum gravity was investigated. By this, the gravity correction constant in the generalized uncertainty relation was suggested and the sense of holographic principle was discussed.

关键词： black hole entropy holographic principle non-commutative quantum field theory event horizon loop quantum gravity

From the Green's Function in Tight-Binding Representation to Interatomic Many-body Potentials

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Journal of Materials Science & Technology 1999年第4期15卷 315-319页

作者： Shaojun LIU(department of physics, Beijing Normal university, Beijing 100875, china)Xiaobo WEI(department of physics, Liuzhou College of Education, Liuzhou 545005, china)Zhaodou CHEN Jun CAI and Benkun MA(department of physics, Beijing Normal university, department of physics Beijing Normal University Beijing 100875 China department of physics Liuzhou College of Education Liuzhou 545005 China

In this paper, we deduce the analytical form of many-body interatomic potentials based on the Green's function in tight-binding representation. The many-body potentials are expressed as the functions of the hopping integrals which are the physical origin of cohesion of atoms. For thesimple case of s-valent system, the inversion of the many-body potentials are discussed in detail by using the lattice inversion method.

关键词： Rev Li Chen From the Green’s Function in Tight-Binding Representation to Interatomic Many-body Potentials body

Dynamics of Spin-2 Bose-Einstein Condensates

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Communications in Theoretical physics 2007年第12期48卷 1041-1046页

作者： HOU Jing-Min department of physics,Southeast university,Nanjing 211189,china department of physics Southeast University Nanjing 211189 China

We numerically simulate the dynamics of a spin-2 Bose-Einstein *** find that the initialphase plays an important role in the spin component *** spin mixing processes can fully cancel out due toquantum interference when taking some initial special *** all the spin mixing processes,the total spin is *** the initial population is mainly occupied by a component with the maximal or minimal magnetic quantum number,the oscillations of spin components cannot happen due to the total spin *** presence of quadratic Zeemanenergy terms suppresses some spin mixing processes so that the oscillations of spin components are suppressed in someinitial spin ***,the linear Zeeman energy terms have no effects on the spin mixing processes.

关键词： spinor Bose-Einstein condensates dynamics spin mixing

Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2)molecule

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Science china(physics,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： REN Weiyi1,2, SUN Weiguo1, HOU Shilin3 & FENG Hao4 1. Institute of physics, College of Chemical Engineering, Sichuan university, Chengdu 610065, china 2. Institute of Theoretical physics, Xihua Normal university, Nanchong 637002, china 3. department of physics, china Oceanography university, Qingdao 266003, china 4. College of physics, Sichuan university, Chengdu 610065, china Institute of physics College of Chemical Engineering Sichuan University Chengdu China Institute of Theoretical physics Xihua Normal University Nanchong China department of physics China Oceanography University Qingdao China College of physics Sichuan University Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2 molecule are studied using the algebraic method (AM) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new formula and high-lying AM vibrational energies. The results show that the AM spectra and the new theoretical dissociation energies agree excellently with experimental data, and thereby providing a new physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

Investigation on the High Temperature Internal Friction of a Subperitectic Al-Zr Alloy in Precipitating Process of ZrAl_3

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Rare Metals 1989年第3期9卷 20-26页

作者： Teng Gongqing Huang Changzhi department of physics,Northeast university of Technology,Shenyang,china Northeast Univ of Technology China

An inverted torsion pendulum has been used to study the high temperature internal friction of an Al-0.22wt% Zr *** experimental result has shown that the grain boundary internal friction peak shifted to lower temperature,the peak height des- cended and the activation energy related to this peak increased in the precipitating process of ZrAl_3 particle in the ***- while,the high temperature background descended so obviously as to be separated from the grain boundary internal *** internal friction peak caused by diffusion around ZrAl_3 particles has been *** mechanism of improvement of proper. ties of aluminium alloys containing a small amount of zirconium has also been discussed.

关键词： Zr Al

s-ordering operator expansions of quantum-mechanical fundamental representations and their applications

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Science china(physics,Mechanics & Astronomy) 2011年第12期54卷 2150-2154页

作者： FAN HongYi 1,3 , XU YeJun 2 & YUAN HongChun 3,4 1 department of Materials Science and Engineering, university of Science and Technology of china, Hefei 230026, china 2 department of physics Electronic and Engineering, Chizhou university, Chizhou 247000, china 3 department of physics, Shanghai Jiao Tong university, Shanghai 200030, china 4 College of Optoelectronic Engineering, Changzhou Institute of Technology, Changzhou 213002, china department of Materials Science and Engineering University of Science and Technology of China Hefei China department of physics Shanghai Jiao Tong University Shanghai China department of physics Electronic and Engineering Chizhou University Chizhou China College of Optoelectronic Engineering Changzhou Institute of Technology Changzhou China

We show that the quantum-mechanical fundamental representations, say, the coordinate representation, the coherent state representation, the Fan-Klauder entangled state representation can be recast into s-ordering operator expansion, which is elegant in form and has many applications in deriving new operator identities. This demonstrates that Dirac's symbolic method can be merged into Newton-Leibniz integration theory in a broad way.

关键词： s-ordering operator expansion operator identities quantum mechanical representation

THE MARCINKIEWICZ -ZYGMUND INEQUALITYIN Ba SPACES (I)

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Journal of Systems Science & Complexity 2003年第1期16卷 74-84页

作者： SHENG Baohuai LIU Sanyang CHEN Guangrong Institute of Mathematics Ningbo University Ningbo 浙江 315211 department of Applied Mathematics Xidian University Xi'an 710071 department of Basics Hebei Science and Technology University Shijiazhuang 050054

The Marcinkiewicz-Zygmund inequality with derivative for an algebraic polynomial of order < N = (q + 1)n - 1 is established in a Ba space. As a corollary, the Marcinkiewicz-Zygmund inequality with derivative for an al... 详细信息

关键词： Marcinkiewicz-Zygmund inequality Ba spaces Orlicz spaces.

Effects of a finite number of particles on the thermodynamic properties of a harmonically trapped ideal charged Bose gas in a constant magnetic field

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Chinese physics B 2016年第1期25卷 465-473页

作者：肖端亮赖梦云潘孝胤 department of physics Ningbo University

We investigate the thermodynamic properties of an ideal charged Bose gas confined in an anisotropic harmonic po- tential and a constant magnetic field. Using an accurate density of states, we calculate analytically the thermodynamic potential and consequently various intriguing thermodynamic properties, including the Bose-Einstein transition tempera- ture, the specific heat, magnetization, and the corrections to these quantities due to the finite number of particles are also given explicitly. In contrast to the infinite number of particles scenarios, we show that those thermodynamic properties, particularly the Bose-Einstein transition temperature depends upon the strength of the magnetic field due to the finiteness of the particle numbers, and the collective effects of a finite number of particles become larger when the particle number decreases. Moreover, the magnetization varies with the temperature due to the finiteness of the particle number while it keeps invariant in the thermodynamic limit N -∞.

关键词： Bose-Einstein condensation thermodynamic potential specific heat magnetization