期刊：
Modern Physics Letters A,1989年04(23):2295-2299 ISSN：0217-7323
通讯作者：
LI, K
作者机构：
Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, China Permanent address: Jianghan Petroleum Institute, Shashi, Hubei, China.;Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, China Permanent address: Yichang Teachers College, Yichang, Hubei, China.;Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, China Permanent address: Langfang Teachers College, Langfang, Hebei, China.
通讯机构：
[LI, K] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN,PEOPLES R CHINA.
摘要：
The significance of transverse energy cut in choosing central nucleus-nucleus collision events is discussed. Introducing a characteristic quantity, the number μeqυ of equivalent energy sources in central collision, the whole ET distribution tail is reproduced successfully. This provides a natural way for defining the ET cut as a criterium for central events. The values of μeqυ and the corresponding ET-cut are both proportional to the number of participating nucleons in central collision, showing that this method is self-consistent.
期刊：
Il Nuovo Cimento A,1989年102(3):771-779 ISSN：1124-1861
通讯作者：
JIANG, ZJ
作者机构：
[JIANG, ZJ; LI, JR] Institute of Particle Physics, Huazhong Normal University, Wuhan, China
通讯机构：
[JIANG, ZJ] H;HUAZHONG NORMAL UNIV, INST PARTICLE PHYS, WUHAN, PEOPLES R CHINA.
摘要：
The independent source model for hadron-nucleus collisions is generalized to include nucleus-nucleus collisions. A simple analytical formula for transverse energy distributions is derived which is then compared with the recent experimental data obtained by NA35 Collaboration at CERN SPS. The features of the experimental results are shown to be the natural consequences of the generalized model.
摘要：
<正> 激光治癌的理论基础是激光与癌细胞物质的相互作用。癌细胞数量的增长律是N=N_(?)e~(at)(1)式中 N_0是时间 t 为0时的癌细胞数量,a 是癌细胞增殖系数,它与癌细胞的寿命和倍增周期有关。癌肿癌的体积倍增律是:V=V_0e~t/(?)(2)式中 V 是在 t 时刻癌肿瘤的体积,V_0是 t 为0时刻的体积,P 是倍增周期。癌细胞物质吸收激光能量产生热,使分子离解,发射荧光和磷光,短波长激光能量高,能激励电子,并通过光激励和光分解,引起光化反应;波长长的激光能量低,能加剧分子的振动,而产生热。因此,激光与癌物质的相互作用是比较复杂的,但大致可以从光、热、压力,电磁场等几个方面的作用加以研究。
作者机构：
CCAST WORLD LAB,CTR ASTRON & ASTROPHYS,BEIJING,PEOPLES R CHINA.;ACAD SINICA,YUNNAN OBSERV,KUNMING,PEOPLES R CHINA.;[YANG, LT] HUAZHONG NORMAL UNIV,DEPT PHYS,WUHAN,PEOPLES R CHINA.
通讯机构：
[YANG, LT] H;HUAZHONG NORMAL UNIV,DEPT PHYS,WUHAN,PEOPLES R CHINA.
关键词：
磁模型;吸积盘;径向振荡;超稳定性
摘要：
We put forward, in the essay, the assumption of the magnetic model of accretion disk with magnetic viscosity. Optically thick, is the disk whose radiation is thermal in the outer region, while in the inner region it is optically thin and the radiation mechanism is synchrotron. From this we derive the general dispersion relation of the accretion disk for the radial oscillation and discuss the stability and overstability in each region of the disk. The conclusion, therefore, is reached that the accretion disk is globally stable and locally overstable. The global stability may avoid the break of the disk, and the local overstability can cause the optical variation on a short-time scale. Calculating the time scale and the magnitude of the variation caused by the overstability, we get the result which fits well the observed result of BL Lac. objects.
