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：
Astrophysics and Space Science,1995年232(2):293-306 ISSN：0004-640X
通讯作者：
Yang, LT
作者机构：
ACAD SINICA,BEIJING ASTRON OBSERV,BEIJING 100080,PEOPLES R CHINA.;GEZHOUBA INST WATER ELECT POWER,DEPT FUNDAMENTAL SCI,YICHANG,PEOPLES R CHINA.;[Yang, LT] HUAZHONG NORMAL UNIV,INST ASTROPHYS,WUHAN 430070,PEOPLES R CHINA.
通讯机构：
[Yang, LT] H;HUAZHONG NORMAL UNIV,INST ASTROPHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The stability of an isothermal, magnetized and causally limited viscosity accretion disk is examined in this paper. We find that the viscous modes are always stable throughout the disk, and the magneto-acoustic modes are pulsationally unstable. The results show that the Mach numbers do effect the instabilities of the disk and the magnetic field enhances the instability property of the radial oscillation. Our results are useful for understanding the time variations of AGN.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1995年69(2):323-326 ISSN：1434-6044
通讯作者：
Liu, LS
作者机构：
[Liu, LS; Zhang, Y; Wu, YF] Institute of particle physics, Hua-Zhong Normal University, Wuhan, People’s Republic of China
通讯机构：
[Liu, LS] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The anomalous scaling of factorial moments with continuously diminishing scale is studied using a random cascading model. It is shown that the model currently used have the property of anomalous scaling only for descrete values of elementary cell size. A revised model is proposed which can give good scaling property also for continuously varying scale. It turns out that the strip integral has good scaling property provided the integral regions are chosen correctly, and that this property is insensitive to the concrete way of self-similar subdivision of phase space in the models.
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.
通讯机构：
[LIU, HP] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
Hadron-Hadron碰撞;多重性分布;KNO计算;三火球模型
摘要：
The multiplicity distributions at Tevatron/large hadron collider (LHC) energies are predicted. The approximate Koba, Neilsen, Olesen (KNO) scaling at lower energies and its violation at above intersecting storage ring energy are discussed by using three fire ball model. It is predicted that there will appear a new KNO scaling in multiplicity distributions at asymptotic energy region after LHC.
作者机构：
Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430070, China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The experimental results on factorial moments (FM’s) in different phase space dimensions are examined in some detail. The general trends of one- and three-dimensional FM’s and the complexity of the two-dimensional ones are pointed out. It is shown that all the complicated patterns of FM’s in different dimensions can be understood comprehensively under the assumption of self-affine fluctuations in 3D, which means that anomalous scaling of FM’s may exist in multiparticle final states provided the shrinkage of phase space is done correctly according to the anisotropic property of multiplicity fluctuations.
作者机构：
[Adamovich M I; Alexandrov Y A] Lebedev Institute;[Aggarwal M M; Arora R; Bhatia V S] Panjab University;[Andreeva N P; Anson Z V; Bubnov V I; Ceitimbetov A M; Chasnikov I Y] Inst of High Energy Physics;[Avetyan F A] Physical Institute;[Badyal S K; Bhasin A] University of Jammu
