Chin. Phys. B
Citation Search Quick Search

ISSN 1674-1056 (Print)
CN 11-5639/O4
About
   » About CPB
   » Editorial Board
   » SCI IF
   » Staff
   » Contact
Browse CPB
   » In Press
   » Current Issue
   » Earlier Issues
   » View by Fields
   » Top Downloaded
   » Sci Top Cited
Authors
   » Submit an Article
   » Manuscript Tracking
   » Call for Papers
   » Scope
   » Instruction for Authors
   » Copyright Agreement
   » Templates
   » Author FAQs
   » PACS
Referees
   » Review Policy
   » Referee Login
   » Referee FAQs
   » Editor in Chief Login
   » Editor Login
   » Office Login
Links
   »
HighLights More»   
Chin. Phys. B  
  Chin. Phys. B--2001, Vol.10, No.11
Select | Export to EndNote
GENERAL

EXACT AND ADIABATIC INVARIANTS OF FIRST-ORDER LAGRANGE SYSTEMS

Chen Xiang-wei, Shang Mei, Mei Feng-xiang
Chin. Phys., 2001, 10 (11): 997-1000 doi: 10.1088/1009-1963/10/11/001
Full Text: [PDF 201 KB] (Downloads:333)
Show Abstract
A system of first-order differential equations is expressed in the form of first-order Lagrange equations. Based on the theory of symmetries and conserved quantities of first-order Lagrange systems, the perturbation to the symmetries and adiabatic invariants of first-order Lagrange systems are discussed. Firstly, the concept of higher-order adiabatic invariants of the first-order Lagrange system is proposed. Then, conditions for the existence of the exact and adiabatic invariants are proved, and their forms are given. Finally, an example is presented to illustrate these results.

TELEPORTATION OF A TWO-PARTICLE ENTANGLED STATE

Ye Liu, Yao Chun-mei, Guo Guang-can
Chin. Phys., 2001, 10 (11): 1001-1003 doi: 10.1088/1009-1963/10/11/002
Full Text: [PDF 174 KB] (Downloads:484)
Show Abstract
A scheme for teleporting a two-particle entangled state via a three-particle entangled state is proposed. It is shown that the probability of successful teleportation is twice the modulus square of the smaller Schmidt coefficient of the entangled three-particle state.

A NEW DIFFERENCE SCHEME WITH MULTI-TIME LEVELS

Feng Guo-lin, Cao Hong-xing, Dong Wen-jie, Chou Ji-fan
Chin. Phys., 2001, 10 (11): 1004-1010 doi: 10.1088/1009-1963/10/11/003
Full Text: [PDF 339 KB] (Downloads:259)
Show Abstract
In view of making the best use of information coming from past observational data, a new difference scheme with multi-time levels (p>3) is suggested. Some mathematical characteristics of the scheme, which is called the retrospective scheme, are discussed. The numerical results of some examples show that the calculation accuracy of linear and nonlinear advection equations computed with the retrospective scheme is higher than that obtained via the leapfrog scheme. The scheme can be applied to many fields, such as meteorology, engineering physics, astronautics, environment and economy etc, where systematic observations are made normally.

EFFECTS OF COLOURED NOISE IN A TWO-MODE LASER SYSTEM

Luo Xiao-qin, Zhu Shi-qun, Gao Wei-jian
Chin. Phys., 2001, 10 (11): 1011-1016 doi: 10.1088/1009-1963/10/11/004
Full Text: [PDF 240 KB] (Downloads:379)
Show Abstract
A homogeneously broadened two-mode laser system with multiplicative coloured noise is investigated when the mode coupling constant ξ=2. An analytical result is obtained when two-dimensional decoupling theory is applied to the system. The intensity auto-correlation function and effective eigenvalue of the laser system are calculated when the difference of pump parameters, multiplicative noise strength and noise correlation time are varied. It is shown that the multiplicative noise can enhance the fluctuations while the noise colour can reduce the fluctuations in the laser system.
CLASSICAL AREAS OF PHENOMENOLOGY

OPTICAL REALIZATION OF WAVELET TRANSFORM WITH A SINGLE LENS

Wang Qu-quan, Xiong Gui-guang, Li Cheng-fang, Zhang Su-huai, Wang Lin
Chin. Phys., 2001, 10 (11): 1028-1031 doi: 10.1088/1009-1963/10/11/007
Full Text: [PDF 208 KB] (Downloads:389)
Show Abstract
Two optical set-ups to implement wavelet transform with a single lens have been proposed, in which the wavelet filter was placed in front of the imaging lens or on the frequency plane. The general formula of the complex field distribution of the output plane has been deduced. The analysing wavelet functions of the band-pass wavelet filters with double and circular slits have been discussed.

FILAMENTATION INSTABILITY OF LASER BEAMS IN NONLOCAL NONLINEAR MEDIA

Wen Shuang-chun, Fan Dian-yuan
Chin. Phys., 2001, 10 (11): 1032-1036 doi: 10.1088/1009-1963/10/11/008
Full Text: [PDF 309 KB] (Downloads:419)
Show Abstract
The filamentation instability of laser beams propagating in nonlocal nonlinear media is investigated. It is shown that the filamentation instability can occur in weakly nonlocal self-focusing media for any degree of nonlocality, and in defocusing media for the input light intensity exceeding a threshold related to the degree of nonlocality. A linear stability analysis is used to predict the initial growth rate of the instability. It is found that the nonlocality tends to suppress filamentation instability in self-focusing media and to stimulate filamentation instability in self-defocusing media. Numerical simulations confirm the results of the linear stability analysis and disclose a recurrence phenomenon in nonlocal self-focusing media analogous to the Fermi-Pasta-Ulam problem.

UNIVERSAL THEORY OF STEADY-STATE ONE-DIMENSIONAL PHOTOREFRACTIVE SOLITONS

Liu Jin-song
Chin. Phys., 2001, 10 (11): 1037-1042 doi: 10.1088/1009-1963/10/11/009
Full Text: [PDF 223 KB] (Downloads:503)
Show Abstract
A universal theory of steady-state one-dimensional photorefractive spatial solitons is developed which applies to the steady-state one-dimensional photorefractive solitons under various realizations, including the screening solitons in a biased photorefractive medium, the photovoltaic solitons in open- and closed-circuit photovoltaic-photorefractive media and the screening-photovoltaic solitons in biased photovoltaic-photorefractive media. Previous theories advanced individually elsewhere for these solitons can be obtained by simplifying the universal theory under the appropriate conditions.
ATOMIC AND MOLECULAR PHYSICS

DETERMINATION OF THE LIFETIME OF THE 4p1P0 STATE OF CALCIUM BY ELECTRON PHOTON COINCIDENCE

M.A.K.Elfayoumi
Chin. Phys., 2001, 10 (11): 1017-1020 doi: 10.1088/1009-1963/10/11/005
Full Text: [PDF 189 KB] (Downloads:260)
Show Abstract
The electron-photon delayed coincidence technique has been used to measure precisely the lifetime for the 4p1P0 state in calcium. The lifetime of this state was obtained by measuring the time correlation spectrum between the inelastically scattered electrons and the corresponding de-excitation photons. By using the least-squares fitting program to fit Gale's equation to the data points, a value of (4.15±0.17) ns was obtained. The result was compared to some of the earlier experimental measurements.

HIGH-RESOLUTION ANALYSIS OF THE ν2+2ν3 BAND OF HDO

Hu Shui-ming, He Sheng-gui, Zheng Jing-jing, Wang Xiang-huai, Ding Yun, Zhu Qing-shi
Chin. Phys., 2001, 10 (11): 1021-1027 doi: 10.1088/1009-1963/10/11/006
Full Text: [PDF 252 KB] (Downloads:317)
Show Abstract
The Fourier transform spectrum of the ν2+2ν3 band of the HDO molecule was recorded with a resolution of 0.02 cm-1. The spectrum was rotational analysed and the spectroscopic parameters of the (0,1,2) state were estimated in terms of Watson's effective rotational Hamiltonian model and also the model in the Padé-Borel approximation form. They reproduce the upper energy levels with an accuracy close to the experimental uncertainty of 0.001 cm-1.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

EFFECTS OF ISLAND-EDGE EXCHANGE BARRIER ON 2D PATTERN FORMATION IN SURFACTANT-MEDIATED EPITAXY

Wang Dai-mu, Sun Xia, Wu Zi-qin
Chin. Phys., 2001, 10 (11): 1043-1048 doi: 10.1088/1009-1963/10/11/010
Full Text: [PDF 235 KB] (Downloads:336)
Show Abstract
The nucleation and growth of two-dimensional islands in a surfactant-mediated epitaxy system have been studied by computer simulation. To improve the recent results published in the literature, we use a configuration-dependent energy barrier for the exchange process at the island edge in our model. The simulations produce fractal islands at high temperatures or low deposition fluxes, and a transition to regular compact islands occurs at lower temperatures or higher fluxes, in good agreement with the recent experimental results. The barrier for the island-edge exchange has quite a strong effect on the island density as a function of temperature and flux. A small change of the island-edge exchange barrier induces a large variation of the island density in the low-temperature or high-flux region. The flux-dependent island density shows a clear scaling-law behaviour in the intermediate-flux region. The scaling exponent increases evidently as the island-edge exchange barrier increases.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

SUPERCONDUCTING FILM INJECTED BY IONS FROM PULSED ENERGETIC DENSE PLASMA SOURCE

Xu Feng-zhi, Chen Geng-hua, Yang Qian-sheng, Ye Mao-fu, Li Yin-an
Chin. Phys., 2001, 10 (11): 1049-1053 doi: 10.1088/1009-1963/10/11/011
Full Text: [PDF 230 KB] (Downloads:344)
Show Abstract
The oxygen and silicon ions have been obtained respectively from pulsed energetic dense oxygen plasma and silane plasma generated by electrodeless discharge. The oxygen ions have been injected into superconducting Nb films, and the Si ions into superconducting YBCO films in order to investigate the variation of their superconductivity with the ions injected into them. Auger profile data show that the injection depths range from 20 to 40nm in the films, depending on the injection condition and film material. The resistance-temperature relations (R-T curves) indicate that the superconductivity remains unchanged in the photoresist-masked part of the film, but is significantly changed in the exposed part. The evenness of the film surface remains unchanged after injection. This technique may serve as an alternative to the planar inhibiting fabrication technique in the fabrication of the multi-layer structure of superconducting films, and also possibly to the conventional plasma source ion implantation technique in material surface processing.

CALCULATION OF DEMAGNETIZATION CURVES OF NANOCOMPOSITE Pr2Fe14B/α-Fe MAGNETS USING A ONE-DIMENSIONAL MODEL

Li Bao-he, Zhang Hong-wei, Zhang Jian, Wang Yun, Zhang Shao-ying
Chin. Phys., 2001, 10 (11): 1054-1057 doi: 10.1088/1009-1963/10/11/012
Full Text: [PDF 226 KB] (Downloads:379)
Show Abstract
The demagnetization curves of nanocomposite magnets have been calculated using a one-dimensional model. The results are in agreement with experimental results. The shoulders of the demagnetization curve have also been explained based on the model.

EFFECTS OF LONG-RANGE INTERACTIONS ON THE FERROELECTRIC FILM

Wu Yin-zhong, Li Zhen-ya
Chin. Phys., 2001, 10 (11): 1058-1061 doi: 10.1088/1009-1963/10/11/013
Full Text: [PDF 209 KB] (Downloads:361)
Show Abstract
The effect of long-range interactions on the spontaneous polarization and the Curie temperature of the ferroelectric film is investigated by use of the Landau theory. On the assumption that the nearest-neighbour interaction remains constant, we find that the spontaneous polarization and the phase transition temperature increase with the enhancement of the long-range interactions. In the case of positive extrapolation length, the critical thickness of the ferroelectric film, in which a size-driven phase transition occurs, decreases with the enhancement of the long-range interactions.

THEORETICAL DEPENDENCE OF LONG WAVELENGTH PHOTOEMISSION UPON THE SIZE OF Ag NANOPARTICLES EMBEDDED IN BaO SEMICONDUCTOR THIN FILM

Yang Hai, Cai Wu-de, Xu Bei-xue, Wu Jin-lei
Chin. Phys., 2001, 10 (11): 1062-1065 doi: 10.1088/1009-1963/10/11/014
Full Text: [PDF 207 KB] (Downloads:397)
Show Abstract
The dependence of long wavelength photoemission upon the size of Ag nanoparticles embedded in a BaO semiconductor is predicted and discussed theoretically. The calculated results show that the increase in the diameter of the Ag nanoparticle, in the range from 1.5 to 37.0nm, leads to the emergence of a roughly Gaussian form of the photoemission spectra and the peaks become markedly narrower. The results also show that the increase in the diameter of the Ag nanoparticle leads to the decrease of the long wavelength threshold. The incident light wavelength corresponding to the peak value of the photoemission gets bigger with the increase of the size of Ag nanoparticles, thus showing a redshift.
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

NEW KINDS OF DIRAC ENERGY LEVELS AND THEIR CROSSING REGIONS

Yang Shu-zheng, Lin Li-bin
Chin. Phys., 2001, 10 (11): 1066-1070 doi: 10.1088/1009-1963/10/11/015
Full Text: [PDF 208 KB] (Downloads:345)
Show Abstract
In the space-time of a non-Kerr-Newman black hole, the Dirac energy levels and their crossing regions are investigated. Near the event horizon of the black hole there are crossing Dirac energy levels, which lead to the occurrence of non-thermal radiation.

THERMODYNAMICS OF GLOBAL MONOPOLE ANTI-DE-SITTER BLACK HOLE IN GRAND CANONICAL ENSEMBLE

Chen Ju-hua, Jing Ji-liang, Wang Yong-jiu
Chin. Phys., 2001, 10 (11): 1071-1079 doi: 10.1088/1009-1963/10/11/016
Full Text: [PDF 288 KB] (Downloads:425)
Show Abstract
In this paper, we investigate the thermodynamics of the global monopole anti-de-Sitter black hole in the grand canonical ensemble following the York's formalism. The black hole is enclosed in a cavity with a finite radius where the temperature and potential are fixed. We have studied some thermodynamical properties, i.e. the reduced action, thermal energy and entropy. By investigating the stability of the solutions, we find stable solutions and instantons.
Copyright © the Chinese Physical Society
Address: Institute of Physics, Chinese Academy of Sciences, P. O. Box 603,Beijing 100190 China(100190)
Tel: 010-82649026   Fax: 010-82649027   E-Mail: cpb@aphy.iphy.ac.cn
Supported by Beijing Magtech Co. Ltd. Tel: 86-010-62662699 E-mail: support@magtech.com.cn