守恒方程的差分型格子气方法

给出了守恒型模型方程的差分型格子气方法，通过定义广义的分布函数，将原方程的求解问题化成关于分布函数的差分算法。该方法的意义在于建立格子气方法和差分法之间的联系，是而可以构造真正用于空气动力的格子气模型，使格子敢方法在可压缩领域成为一种实用方法。     

FAR-INFRARED AND INFRARED REFLECTIONS OF Tl2Ba2Ca2Cu3O10 FILM

The far-infrared and infrared reflection spectra of Tl₂Ba₂Ca₂Cu₃O₁₀ superconducting film are reported in this paper. It is found there are three sharp reflection edges in both the superconducting and normal states, their positions being near ≈ 150, ≈ 350 and ≈600 cm^-1. We attribute these reflection spectra to the Drude free carriers and a wide mid-infrared absorption band. When the incident angle increases from 7° to 30°, some additional stractures appear in the refiection spectra, which are the A_2u phonon modes vibrating along c-axis.     

外来的捕食物种对濒危物种的影响

In this paper, an important problem arising from conservation biology is considered. Namely, how does the introduced species affect the survival of a native endangered species through predation? By using Kamke comparison theorem and some results in Cui and Chen‘s paper (1998), some sufficient conditions that guarantee the permanence of the species and global stability of a unique positive periodic solution are obtained. Biological implication of these results are discussed.     

TlBaCaCuO外延膜的光响应

在波长γ＝６３２．８ｎｍ，入射功率约０．８ｍ的Ｈｅ－Ｎｅ激光照射下，对ＴｌＢａ２Ｃａ２ＣｕＯ２（Ｔｌ－２２１２）外延膜的光响应行为进行了实验研究。结果显示：在样品转变温度（Ｔｃ＝１０５．５Ｋ）附近，ＴｌＢａ－ＣａＣｕＯ外延膜的光响应行为表现为辐射热与非辐射热效应共存现象。光响应信号电平与样品温度、偏置电流、及入射光束的调制频率等诸因素有密切关系的关系。实验结果还表明，辐射热与非辐射热效应的响应行为