defocusing coefficient

Using the fundamental equations of Bose systems, the characteristics of Bose integral and theory of thermodynamics, an analytical expression of Joule-Thomson coefficient (JTC) of ideal Bose gas is derived in this paper.

应用玻色系统的基本方程 ,玻色积分的特性以及热力学理论 ,导得理想玻色气体焦汤系数的解析表达式 ,详细讨论了低温下玻色气体的定压热容和焦汤系数 ,阐明了系统的量子本性对焦汤系数的贡献 。

This paper summarizes three different processes about the change of the temperature(T) as the volume(V) of gas is expanded,deduces the expression of the Joule coefficient TV_U as a function of the second Virial coefficient B(T),and investigates semiquantitatively for corrections [a(T) and b(T)]of the van der Waals Equation.

综述气体温度随体积膨胀而变化的三种实验过程,导出焦耳系数的第二位力系数[B(T)]表示,从理论上证实焦耳实验结果的不可靠;对范德瓦耳斯方程改正项a(T)和b(T)作半定量分析,由此给出焦汤实验存在反转温度的更明显的微观解释。