会议名称：
XXVIIth International Symposium on Multiparticle Dynamics
会议时间：
SEP 08-12, 1997
会议地点：
INFN, NATL LABS, FRASCATI, ITALY
会议主办单位：
PN Lebedev Phys Inst, Moscow 117924, Russia.^High Energy Phys Inst, Almaty, Kazakhstan.^Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.^Panjab Univ, Dept Phys, Chandigarh 160014, India.^Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.^Joint Nucl Res Inst, Dubna, Russia.^Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India.^Univ Jammu, Dept Phys, Jammu 180004, India.^Safarik Univ, Dept Nucl Phys & Biophys, Kosice, Slovakia.^Shanxi Normal Univ, Dept Phys, Linfen, Shanxi, Peoples R China.^Univ Lund, Dept Phys, Lund, Sweden.^Univ Marburg, Fachbereich Phys, D-3550 Marburg, Germany.^Univ Washington, Dept Phys, Seattle, WA 98195 USA.^Inst Phys Nucl, Tashkent, Uzbekistan.^Phys Tech Inst, Tashkent, Uzbekistan.^Huazhong Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.^St Petersburg Nucl Phys Inst, St Petersburg, Russia.
摘要：
Angular distributions of charged particles produced in O-16 and S-32 collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in nucleus-nucleus collisions can be seen as superposition of the angular distributions in nucleon-nucleus collisions taken at the same impact parameter b(NA), that is mean impact parameter between the participating projectile nucleons and the center of the target nucleus.
关键词：
Spectral Density;Spectral Representation;Time Formalism;Ward Identity;Finite Temperature
摘要：
We derive the spectral representations of QED 3-point functions and then explicitly calculate the 3-point spectral densities in hard thermal loop approximation within the real time formalism. The Ward identities obeyed by the retarded and advanced 2- and 3-point functions are discussed. We compare our results with those for hot QCD.
期刊：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS,1999年38(2):537-543 ISSN：0020-7748
通讯作者：
Zuo, J
作者机构：
[Zuo, J] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Dalian Univ Technol, Dept Phys, Dalian 116023, Peoples R China.
通讯机构：
[Zuo, J] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Field Theory;Elementary Particle;Quantum Field Theory;Analytic Continuation;Thermal Propagator
摘要：
Journal of Animal Ecology publishes the best original research on all the broad aspects of animal ecology, including;•Ecosystem Ecology•Evolutionary Ecology•Community Ecology•Population Ecology •Physiological EcologyField, laboratory and theoretical studies based upon terrestrial, freshwater or marine systems are all considered for publication. The Editors are specifically seeking papers that are novel, interesting and make general contributions to the broad field of animal ecology and ecologists. Papers using molecular approaches to address the central ecological pattern/process are also encouraged.
作者机构：
[Hu, XM; Peng, JS] Huazhong Normal Univ, Dept Phys, Whuhan 430079, Peoples R China.
通讯机构：
[Hu, XM] H;Huazhong Normal Univ, Dept Phys, Whuhan 430079, Peoples R China.
摘要：
The effect of the pump phase diffusion on the linewidth of a laser without inversion is studied. It is shown that the linewidth at equal intensity may be reduced below that for a coherent driving, enen if the net effect of the pump bandwidth leads to an increase in the linewidth. The physical mechanism is analyzed in the dressed-state picture. Furthermore, the effects of the pump phase noise on the linewidths of an inversionleess laser and a Raman laser are compared with each other.
作者机构：
[Hu, XM; Peng, JS] Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hu, XM] H;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
Quantum optics;Coherent light;Spontaneous emission;Irreversible channels;Population transfer
摘要：
Dynamically induced irreversibility is found to take place in coherently driven Λ systems in which there is no conventional source of irreversible population pumping. When the rates of spontaneous emission from the excited state to two metastable states are equal, the dynamically induced irreversibility leads to population inversion of 0.07. When two atomic decay rates are not near to each other, a maximum population inversion of 0.4 is achieved. The maximum population inversion requires atom-field detunings of the opposite signs, as well as both strong coupling of the atom to coherent fields and a disparity in the atomic decay rates. On the other hand, even in cases where two detunings have the same sign, it is possible to obtain population inversion.
摘要：
The effect of the laser linewidth on the resonance fluorescence spectrum of a two-level atom is revisited. The novel spectral features, such as hole-burning and dispersive profiles at line centre of the fluorescence spectrum are predicted when the laser linewidth is much greater than its intensity. The unique features result from quantum interference between different dressed-state transition channels, (C) 1999 Elsevier Science B.V.
作者机构：
[Hwa, RC] Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.;Univ Oregon, Dept Phys, Eugene, OR 97403 USA.;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.
通讯机构：
[Hwa, RC] U;Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.
摘要：
The soft production problem in hadronic collisions as described in the eikonal color mutation branching model is improved in the way that the initial parton distribution is treated. Furry branching of the partons is considered as a means of describing the nonperturbative process of parton reproduction in the soft interaction. The values of all the moments, 〈n〉 and Cq, for q=2,…,5, as well as their energy dependences, can be correctly determined by the use of only two parameters.
期刊：
Nuclear Physics B - Proceedings Supplements,1999年71(1-3):341-345 ISSN：0920-5632
通讯作者：
Liu, LS
作者机构：
[Liu, LS] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, LS] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
会议名称：
XXVIIth International Symposium on Multiparticle Dynamics
会议时间：
SEP 08-12, 1997
会议地点：
INFN, NATL LABS, FRASCATI, ITALY
会议主办单位：
Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The meaning of single event analysis is discussed. Some examples are listed. The special interest in 2-D factorial moment analysis is explained in some detail. The single event 2-D factorial moment analysis of 11 A GeV central Au-Emulsion collision data from EMU01 is given.
期刊：
Chinese Astronomy and Astrophysics,1999年23(1):36-41 ISSN：0275-1062
通讯作者：
Lu, Y
作者机构：
[Lu, Y] Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;Huazhong Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.;Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430071, Peoples R China.
通讯机构：
[Lu, Y] H;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
accretion;accretion disk;MHD instability
摘要：
The radial oscillation instability of both magnetic-equipartion and magnetic-conservation models of accretion disks with self-gravitation is examined. Our results show that there are three modes in the disk. The viscous mode is always stable, the magneto-acoustic mode is unstable, and the neutral mode tends to be stable in long wavelength region and unstable in short wavelength region. The effects of self-gravitation for the three modes are similar in both models, but the effects of the magnetic field are opposite. These results suggests that the magnetic-equipartition model is the best one for explaining the time variations of X-ray stars and active galactic nuclei.
期刊：
Il Nuovo Cimento A,1999年112(8):801-808 ISSN：1124-1861
通讯作者：
Li, W
作者机构：
[Cai, X; Li, W] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Li, W] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Quark rotation asymmetry is proposed in calculating baryon magnetic moments. After taking into account interactions enforced on constituent quarks, assumed to be linear and Coulomb potentials, respectively, and the quark rotation asymmetry, we fit the theoretical values, based on two more hypotheses and several other reasonable assumptions, of baryon magnetic moments with those from experiments. The good fitting results show the necessity of the consideration of quark rotation asymmetry within baryon.
