期刊：
Physica C: Superconductivity and its Applications,1996年270(3-4):333-342 ISSN：0921-4534
通讯作者：
Lam, CC
作者机构：
SE UNIV,CTR ANAL & TEST,NANJING,PEOPLES R CHINA.;NANJING UNIV,CTR ADV STUDIES SCI & TECHNOL MICROSTRUCT,DEPT PHYS,NANJING 210093,PEOPLES R CHINA.;NANJING UNIV,CTR ADV STUDIES SCI & TECHNOL MICROSTRUCT,NATL LAB SOLID STATE MICROSTRUCT,NANJING 210093,PEOPLES R CHINA.;CENT CHINA NORMAL UNIV,DEPT PHYS,WUHAN,PEOPLES R CHINA.;[Lam, CC] CITY UNIV HONG KONG,DEPT PHYS & MAT SCI,HONG KONG,HONG KONG.
通讯机构：
[Lam, CC] C;CITY UNIV HONG KONG,DEPT PHYS & MAT SCI,HONG KONG,HONG KONG.
摘要：
In this paper, we have used the sputtering neutral-particles mass spectroscopy (SNMS) and positron-annihilation technique to investigate the effect of hydrogenation on the physical properties of different oxygenated YBa2Cu3O7-delta superconductors. Under the same of hydrogenation treatment, the hydrogenation effects on the superconductors are compared to the non-superconductors. It was shown that the hydrogen concentration in the superconductors is about eight times of the non-superconductor's. It was proven that the long lifetime of positrons in the annihilation process is determined by the variation of the concentrations of monovacancies and microvoids, which takes place in both of intragrain and intergrain samples. The hydrogenation effect can be classified into four stages. At the first stage, the hydrogen atoms fill both monovacancy and microvoid. At the end of the first stage, the long lifetime tau(2) reaches the maximum value which is determined by the lifetime of the positron in the monovacancy-free and nearly microvoid-exhausted YBCO sample. In the second stage, the hydrogen charging will lead to creation of new monovacancies; this will make the long lifetime tau(2) drop monotonically to its minimum value. In the third stage, further hydrogen charging promotes the formation of microvoids, and leads to an increasing tau(2) up to a saturation value, which indicates the equilibrium concentrations of monovacancy and microvoid at that temperature.
作者机构：
[Xiao, CY; Deng, KM] NANJING UNIV SCI & TECHNOL,DEPT APPL PHYS,NANJING 210014,PEOPLES R CHINA.;[Xiao, CY] CENT CHINA NORMAL UNIV,DEPT PHYS,WUHAN 430070,PEOPLES R CHINA.
通讯机构：
[Xiao, CY] C;CENT CHINA NORMAL UNIV,DEPT PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
Ti↓8C↓（12）;V↓8C↓（12）
摘要：
The electronic structure and stability of dodecahedral Ti8C12 and V8C12 clusters are studied and compared with each other by using the discrete-variational local-density functional method. The results show that there exists a nearly-rigid-band-shift relation between the electronic structures for the two clusters and that the corresponding bands for them have similar bonding character. Therefore, both clusters can be stable for similar reasons. The results also indicate that there exist two types of charge transfers for both clusters, in which the electrons are found to accumulate to the Ti3d (V3d) and C2p orbitals so that the p-d bonding between the C and Ti (V) atoms is strengthened. Based on the above results, the influence of the charge on the electronic structure and stability of both clusters is examined. Finally, the ground-state electronic configurations are obtained for both clusters in the neutral, cationic and anionic charge states. The ground states for the cationic Ti8C12 and V8C12 clusters are found to be nondegenerate. The dodecahedral structures for these two clusters are thus remarkably stable. The rest clusters, i.e., neutral and anionic Ti8C12 and V8C12 clusters, have degenerate ground state, and therefore, their structures are expected to undergo Jahn-Teller distortion further.
期刊：
EUROPEAN PHYSICAL JOURNAL B,1996年100(1):91-93 ISSN：1434-6028
通讯作者：
Li, GX
作者机构：
[Peng, JS; Li, GX] HUAZHONG NORMAL UNIV, DEPT PHYS, WUHAN 430070, PEOPLES R CHINA.;[Li, GX] CCAST, WORLD LAB, POB 8730, BEIJING 100080, PEOPLES R CHINA.
通讯机构：
[Li, GX] C;CCAST, WORLD LAB, POB 8730, BEIJING 100080, PEOPLES R CHINA.
摘要：
The generation of two-mode pure states in a lossless nondegenerate two-photon micromaser has been analyzed. The results show that under appropriate conditions, the field may evolve to pure states which can exhibit two-mode squeezing, or evolve to two-mode number states.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1996年71(3):503-505 ISSN：1434-6044
通讯作者：
Hou, DF
作者机构：
[Hou, DF; Li, JR] Institute of Particle Physics, Hua Zhong Normal University, Wuhan, China
通讯机构：
[Hou, DF] H;HUA ZHONG NORMAL UNIV, INST PARTICLE PHYS, WUHAN 430070, PEOPLES R CHINA.
摘要：
The next-to-leading order Debye screening mass in QGP is calculated by taking into account the damping rate of gluons in the formalism of real time finite temperature QCD, and the infrared singularity of the naive calculation is cured without adding a nonperturbative magnetic screening mass as a cutoff. In addition, the result is shown to be postive and gauge-independent, and is compared with the results from lattice simulations.
作者机构：
UNIV SCI & TECHNOL CHINA,CTR FUNDAMENTAL PHYS,HEFEI 230026,ANHUI,PEOPLES R CHINA.;NANJING UNIV SCI & TECHNOL,DEPT APPL PHYS,NANJING 210014,JIANGSU,PEOPLES R CHINA.;CENT CHINA NORMAL UNIV,DEPT PHYS,WUHAN 430070,HUBEI,PEOPLES R CHINA.;[Yang, JL] CCAST WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
通讯机构：
[Yang, JL] C;CCAST WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
关键词：
Transition-metal cluster;Electronic structure;Multiple magnetic states
摘要：
The electronic structure of 13-atom Ru clusters with three possible high-symmetry geometries is studied using the discrete-variational local-spin-density-functional method. All clusters are found to have two self-consistent magnetic solutions in their equilibrium configurations. The low-spin solutions are more energetically stable than the high-spin ones. The ground state is found to correspond to the icosahedral cluster. It has a magnetic moment of 4μB, or 0.31μB per atom, in good agreement with the upper limit of experimental measurement, 0.29μB per atom.
摘要：
The spectral representation for general two-point Green functions in thermo field dynamics is used to compute the spectral density of the φ2−φ2 correlation function in hot φ4 theory. We give a compact derivation of the one-loop contribution to the shear viscosity and show that it is dominated by low-momentum plasmons. The weak-coupling behavior of the viscosity is strongly influenced by the momentum dependence of the plasmon width.
期刊：
Il Nuovo Cimento A,1996年109(4):363-375 ISSN：1124-1861
通讯作者：
Chen, XJ
作者机构：
[Chen, XJ; Zhang, WN] Department of Physics, Harbin Institute of Technology, Harbin, PRC;[Liu, LS] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, PRC
摘要：
The effective potential of the scalar phi(4) theory up to two loops is calculated. The subtraction scheme of regularization at finite temperature in real-time formalism is discussed.
期刊：
Astrophysics and Space Science,1996年240(2):305-316 ISSN：0004-640X
通讯作者：
Ye, L
作者机构：
[Shaoping W.; Ye, L; Lantian Y.; Pibo Y.] Institute of Astrophysics, Huazhong Normal University, Wuhan, 430070, China
通讯机构：
[Ye, L] H;HUAZHONG NORMAL UNIV,INST ASTROPHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
Magnetic Field;Accretion Disk;Oscillation Instability;Outer Disk;Pulsational Instability
摘要：
This is the first paper to consider the effects of both magnetic field and self-gravity on the pulsational instability. Our main new results are that the self-gravity enhances the instability of the magneto-acoustic mode in the outer disk strongly, and also affects the instability in the inner disk, but stabilized the viscous mode. The effect of self-gravity is much greater than that of magnetic field in the outer disk, while the effect of magnetic field on the instability is weaker than that in the previous work's (Wu et al., 1995; Yang et al., 1995), in which the self-gravity has not been considered. Finally, we discuss our results.
作者机构：
[Liu, LS; Hu, Y; Deng, Y] Institute of Particle Physics, Huazhong Normal University, Wuhan 430070, China
通讯机构：
[Liu, LS] H;HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
Relativistic heavy ion collision;Scaling behaviour of factorial moments;Signal of QGP formation
摘要：
It is argued that the experimentally observed strong upward-bending of the logarithm of factorial moments versus that of phase space partition number in the higher-dimensional phase space of nucleus-nucleus collisions is due to the superposition of elementary collision processes in these collisions. A direct implication of this observation is that, at high enough energy and/or density, when the produced particles from individual elementary processes are melted into a unified system, the above-mentioned superposition effect will disappear and the factorial moments will not be strongly upward-bending any more. So, the disappearance of strong upward-bending of higher-dimensional factorial moments in heavy ion collision may be taken as a signal for the formation of a unique system in this collision.
作者机构：
[Li, YD; Liu, LS] Institute of Particle Physics, Hua Zhong Normal University, Wuhan, 430070 China
通讯机构：
[Li, YD] H;HUAZHONG NORMAL UNIV, INST PARTICLE PHYS, WUHAN 430070, PEOPLES R CHINA.
摘要：
Numerical results are presented for the photoproduction of two-jet via resolved quasi-real photon at HERA in next-to-leading order (NLO) QCD. It shows that the NLO contribution is important and reliable in the two-jet invariant mass region M(JJ) is an element of [15,45] GeV and rapidity region y(jjlab) > -2 This may be used to explain the ZEUS results with an uncertainty of 20%. The dependences on renormalization and factorization scales are also investigated.
作者机构：
[Zhang, XF; Li, JR] Institute of Particle Physics, Huazhong Normal University, Wuhan 430070, China
通讯机构：
[Zhang, XF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
夸克;反夸克;胶子;非Abelian互作用;QGP输运理论
摘要：
If is shown that the non-Abelian properties of QGP can be got by studying the kinetic equations for QGP beyond the linear response theory. The non-Abelian interaction of the eigenmodes in QGP is found and two quantities describing the non-Abelian properties of QGP are given.
通讯机构：
[CAI, X] H;HUA ZHONG NORMAL UNIV, INST PARTICLE PHYS, WUHAN 430070, PEOPLES R CHINA.
摘要：
Recent experimental data on the negative correlation between forward energy and transverse energy, which have been reported for the interactions of 14.6A GeV Si28 with Al, Cu, Au, and Pb, 60A and 200A GeV O16 and S32 with S, Cu, Ag, and Au, are investigated by a model based on the description of geometrical properties of nucleus-nucleus collision processes. A parameter, ellipticity e, which might describe the conversion of initial energy into that of radiated final-state hadrons is proposed.
通讯机构：
[WU, YF] H;HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
HIGH ENERGY MULTIPARTICLE PRODUCTION;LONGITUDINAL PHASE SPACE;DYNAMICAL FLUCTUATION;AVERAGE TRANSVERSE MOMENTUM
摘要：
The highly anisotropic phase space (known as longitudinal phase space) of multiparticle final states in high energy hh collisions is studied in detail. It is pointed out that the anisotropy of phase space should manifest itself not only in the dramatic difference in magnitude between the average transverse and longitudinal momenta, but also in the anisotropy of dynamical fluctuations in the two directions. It means that the particle distribution in phase space has the property of selfaffine fractal. A method for experimentally testing the selfaffine fractality and measuring its characteristic parameterHurst exponent is given. In addition, the correlation between the degree of longitudinal fractality and the magnitude of average transverse momentum is discussed. A new characteristic quantity- average transverse momentum per event- for de scribing the dynamical property of an event (hard, soft or ultrasoft) is proposed. A comparison of the results with experimental data is given.
通讯机构：
[YANG, CB] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The energy spectrum of heavy-light meson states is studied in the framework of the full Bethe-Salpeter equation. The heavy-flavor mass expansion method is also used to obtain the heavy-light meson energy spectrum from both the first-order correction and the heavy quark limit. The results calculated by our model for the masses of D0, D±, B0, B±, D*0, D*±, B*, D10, and Ds± are in good agreement with the experimental data.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1995年65(3):421-429 ISSN：1434-6044
通讯作者：
ADAMOVICH, MI
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH,PUNJAB,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT NUCL RES INST,HIGH ENERGIES LAB,DUBNA,RUSSIA.;UNIV RAJASTHAN,DEPT PHYS,JAIPUR 302004,RAJASTHAN,INDIA.
通讯机构：
[ADAMOVICH, MI] I;INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.
关键词：
Field Theory;Elementary Particle;Quantum Field Theory;Weak Correlation;Impact Parameter
摘要：
The mechanism for producing slow, target associated particles in high energy heavy ion collisions is investigated. It is shown that the same mechanism which was proposed for hadron induced interactions is likely to appear also for heavy-ion reactions. The results indicate however a much weaker correlation between impact parameter and yield of slow particles.
作者机构：
[ZHANG, Y; LIN, H; LIU, LS] YANBEI NORMAL COLL,DEPT PHYS,DATONG 037000,PEOPLES R CHINA.;[ZHANG, Y] HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
通讯机构：
[ZHANG, Y] H;HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
α-模型;Levy稳定性;概率分布;部分子-部分子碰撞
摘要：
The Levy stable analysis for tandem cascade model is performed. The Levy stable index mu of alpha-model is obtained by both Monte-Carlo simulation and analytical calculation. It is found that mu is increasing when the fluctuation becomes weaker, and vice versa, just as expected. It is shown that the Levy stable index of alpha-model depends mainly upon the model parameter alpha. Its weak dependence on the number lambda of branches in each elementary splitting is due to the normalization of probability in each step. The possible reason of the Levy stable index greater than 2 found experimentally is briefly discussed.
通讯机构：
[JIA, Y] H;HUAZHONG NORMAL UNIV,DEPT PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
随机过程;噪声;Fokker-Planck方程;动力学模型
摘要：
The combined effect of several noises has been proposed recently. It has displayed that the presence of the correlation between noises can change the properties of the stochastic processes. In this paper, a general effective Fokker–Planck equation (FPE) with correlated noises is derived. The stationary distributions and the moments of two kinetic models under two correlated noise sources are obtained. The effects of the interference of additive and multiplicative noises are analyzed.
