期刊：
Journal of Mathematical Analysis and Applications,1995年189(3):617-630 ISSN：0022-247X
通讯作者：
WANG, XJ
作者机构：
HUAZHONG NORMAL UNIV,DEPT MATH,WUHAN 430070,PEOPLES R CHINA.;ZHEJIANG UNIV,INST MATH,HANGZHOU,PEOPLES R CHINA.;[WANG, XJ] ZHEJIANG UNIV,DEPT MATH,HANGZHOU,PEOPLES R CHINA.
通讯机构：
[WANG, XJ] Z;ZHEJIANG UNIV,DEPT MATH,HANGZHOU,PEOPLES R CHINA.
关键词：
Positive solutions
摘要：
In this paper, by means of a priori estimates and topological degree theory, we prove the existence of two or more solutions to nonlinear elliptic equations of nondivergence form. (C) 1995 Academic Press, Inc. [References: 9]
作者机构：
TONGJI MED UNIV,WUHAN,PEOPLES R CHINA.;CHINA UNIV GEOSCI,DEPT APPL CHEM,WUHAN 430074,PEOPLES R CHINA.;[LU, GH] CENT CHINA NORMAL UNIV,DEPT CHEM,WUHAN 430070,PEOPLES R CHINA.
通讯机构：
[LU, GH] C;CENT CHINA NORMAL UNIV,DEPT CHEM,WUHAN 430070,PEOPLES R CHINA.
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,HIGH ENERGIES LAB,DUBNA,RUSSIA.;UNIV RAJASTHAN,DEPT PHYS,JAIPUR 302004,RAJASTHAN,INDIA.
通讯机构：
[ADAMOVICH, MI] K;KAZAKH ACAD SCI,INST HIGH ENERGY PHYS,ALMA ATA,KAZAKHSTAN.
摘要：
Pseudorapidity density and multiplicity distributions of charged particles produced in heavy-ion collisions at the BNL AGS have been studied. The multiplicity distributions and pseudorapidity distributions of shower particles in Au-induced interactions are presented and compared with model predictions from RQMD, FRITIOF and VENUS. It is shown that the widths of the pseudorapidity distributions of produced particles in central collisions are independent of the interacting system. The results from EMU01 have been compared, and found to agree, with the results from two other heavy-ion experiments, E802 and E814.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1995年351(3):311-316 ISSN：1434-6001
通讯作者：
ADAMOVICH, MI
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PUNJABI UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,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.
摘要：
The fragmentation topology of Si-28 at 3.7 A GeV and 14.6A GeV and S-32 at 200A GeV in reactions with emulsion nuclei is presented. The fragmentation cross sections are very similar at all three energies. A statistical percolation model can qualitatively describe the data for Z greater than or equal to 6. The He production is underestimated and the 3 less than or equal to Z less than or equal to 5 fragments overestimated by this model.
摘要：
By analyzing the fourth-order dispersion relation, the influence of coupled radial and azimuthal perturbations on the stability of a radiation-pressure-dominated accretion disk is investigated. If the azimuthal perturbations are considered, we find that the stability properties of disk are different from that in purely radial perturbation case. For a standard α disk model, the thermal instability is the dominant instability, and it is enhanced in the presence of azimuthal perturbations, while the viscous mode and the acoustic modes tend to become stable with the increase of azimuthal perturbation wavenumber. The increase of viscosity will enhance the instabilities of thermal and viscous modes, as well as that of acoustic modes. The acoustic instability exists only in the case without azimuthal perturbations or with very low azimuthal wavenumber. For a slim disk model, the situation is quite similar except that the thermal and viscous modes are never unstable in the absence of azimuthal perturbations, where the acoustic instability is dominant.
作者机构：
INST HIGH ENERGY PHYS,ALMA ATA,KAZAKHSTAN.;ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;INST GRAVITAT & SPACE RES,BUCHAREST,ROMANIA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.
作者机构：
HUAZHONG NORMAL UNIV,INST ORGAN SYNTH,WUHAN 430070,PEOPLES R CHINA;ACAD SINICA,INST BIOPHYS,BEIJING 100101,PEOPLES R CHINA;[吕斌; Liu, CH] 华中师范大学有机合成所;[Shang, HY; 徐建兴] 中科院生物物理所
作者机构：
[Zhu, CF; Xiao, HY] Hua Zhong Normal Univ, Dept Chem, Wuhan 430070, Peoples R China.
关键词：
TRIA
摘要：
By refluxing with cuprous halides in acetonitrile trialkyl phosphites can be directly converted into the corresponding dialkyl alkylphosphonate. The conversion of trialkyl phosphates with cuprous iodide is more favorable than with cuprous chloride; The activity of the alkyl group for the rearrangement is in the order of Me>Et> butyl.
摘要：
The global asymptotic stability of a specific equilibrium position is investigated for a class of Hopfield-type neural networks. Some sufficient conditions are given which guarantee the existence, uniqueness and global asymptotic stability of an unknown equilibrium point.
作者机构：
[Lu, B; Zhang, JL; Liu, CH] Cent China Normal Univ, Inst Organ Synth, Wuhan 430070, Peoples R China.
摘要：
A series of 5-substituted-2-chloro-6-methyl-4,7-dioxobenzothiazole derivatives have been synthesized by interaction of 2-chloro-6-methyl-4,7-dioxobenzothiazole with the appropriate alkylamine and allyl mercaptan, Their structures are identified by UV, IR, H-1-NMR and MS spectrum analysis.
通讯机构：
[HOU, DF] H;HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
Weinberg-Salam模型;顶夸克;弱电相移;重子对称性
摘要：
The effective potential of the Weinberg-Salam (WS) model is calculated at finite temperature and in the chemical potential of top quarks according to the grand canonical ensemble temperature field theory. The electroweak transition is studied at hot and density conditions. It is indicated that the symmetry restoring transition can take place either by increasing the temperature or chemical potential of top quarks, but at high temperature and in the low chemical potential the transition is of the first order, and it becomes the second order at a cold density condition. The phase diagrams are showed.
期刊：
ASTRONOMY AND ASTROPHYSICS,1995年303(2):635-642 ISSN：0004-6361
通讯作者：
YANG, LT
作者机构：
[WU, SP; YANG, LT; WANG, DX; LIU, ZD] S CENT COLL NATL, DEPT PHYS, WUHAN 430074, PEOPLES R CHINA.;[YANG, LT] HUAZHONG NORMAL UNIV, INST ASTROPHYS, WUHAN 430074, PEOPLES R CHINA.
通讯机构：
[YANG, LT] H;HUAZHONG NORMAL UNIV, INST ASTROPHYS, WUHAN 430074, PEOPLES R CHINA.
关键词：
ACCRETION DISKS;MAGNETOHYDRODYNAMICS (MHD);INSTABILITIES;GALAXIES, ACTIVE
摘要：
The stability of an isothermal, magnetized, radial viscosity and causally limited viscosity accretion disk is examined in this paper. We find that the viscous modes are always stable throughout the disk, and that the magneto-acoustic modes are pulsationally unstable. We also get some useful instability conditions. The numerical calculation results show that the Mach numbers do affect the instabilities of the disk. The radial viscosity damps the instability and the magnetic field enhances the instability of the radial oscillation. Our results are useful for understanding the time variations of AGN.
摘要：
A radial-azimuthal stability analysis of a geometrically thin, gas-pressure-dominated accretion disk is presented. In the purely radial perturbation case, the disk is pulsationally unstable to the acoustic modes but stable to the thermal and viscous modes. If the coupling of radial and azimuthal perturbations is considered, the stability properties of the disk are different. With the increase of azimuthal wavenumber, the acoustic modes tend to become stable while the viscous mode becomes unstable. The acoustic instability exists only for large viscosity and small azimuthal wavenumber, while the viscous instability exists for small viscosity and large azimuthal wavenumber. The inclusion of azimuthal perturbations, however, has nearly no effect on the stability of thermal mode, which is always stable in the disk. The influence of opacity on the stability of a gas-pressure-dominated disk has also been investigated. We find that if the free-free absorption dominates the opacity, the disk is more stable than that with electron-scattering domination.
期刊：
CHINESE CHEMICAL LETTERS,1995年6(12):1021-1024 ISSN：1001-8417
作者机构：
[Yang, FL; Liu, ZJ; Chen, WB] Cent China Normal Univ, Inst Organ Synth, Wuhan 430070, Peoples R China.
摘要：
The thermal (3,3) - sigmatropic type rearrangement of O-aryl-O-methyl-O-propargyl thionophosphates in solvents such as benzene, toluene and p-xylene to provide O-aryl-O-methyl-allenyl thiolophosphates is described.
摘要：
On the basis of the nontopological soliton bag model, it is proposed that the quark decon-finement may be indicated by the unstability and disappearance of solition solutions at finite-temperature and finite-density. The thermal effects on the vacuum structure of strongly interacting matter are investigated, and the soliton field equation of the model is solved directly in the whole range of temperature via a numerical method. The phase structure of the system and the features of deconfining phase transition are analysed in detail. In addition, the collective excitations in the vacuum caused by thermal effects are investigated by making use of an order parameter which is given to describe the vacuum condensation at finite temperature. A physical mechanism and an intuitive picture are presented for the formation of QGP from both deconfined hardon matter and the vacuum excitation in relativistic heavy ion collisions.
