β射线之吸收系数

自UX₂及RaE放出之β射线之吸收系数经实验后得下列结果:(1)吸收图为数段直线所合成,厚吸收片者坡度较陡。(2)吸收系数随三种因素而改变,一为承受放射物之性质与厚薄,一为围绕放射物之圆管,一为放射物与游离箱之距离。     

稀土化合物RX的晶场参数分析

本文对NaCl型结构的稀土化合物RX(X=N,P,As,Sb,Bi)的晶场参数B₄⁰的实验值进行了分析。在此基础上我们提出一个新的利用简单点电荷模型计算RX晶场参数B₄⁰值的关系式:B₄⁰=k₃(B₄⁰)_p+c₃。用此关系式我们确定了一系列RX的晶场参数B₄⁰值,结果与实验值符合很好。对关系式的含义本文也作了充分讨论。 关键词：     

Cd(0.2)-Sn-Zn三元合金高压垂直截面相图的测定

 采用高压DTA方法，测定了Cd-Sn-Zn三元系中x_Cd=20 at.%截面的高压垂直截面相图，实验压力为0，0.5，1.0，1.5 GPa。所得高压相图与常压相图比较，在p=1.5 GPa时低共晶点上移了大约35 K，共析组成在加压过程中几乎不变。这种变化趋势与理论计算的结果相图，所得高压相图的液相线与计算相图的一致。     

A simple method improving the analyzing accuracy of circular groove guide

A simple method is introduced to improve the analysing accuracy of circular groove guide. With this method, the characteristic equation of circular groove guide is derived and its solution is given and discussed.The Project Supported by National Natural Science Foundation of P.R.China     

Finite-element calculation of the influence of interdiffusion on eigenstates in a GaAs/Al x Ga1-x As single-quantum-well structure

The influence of interdiffusion on eigenstates in an interdiffusion-induced GaAs/Al_xGa_1-xAs single-quantum-well structure is analysed numerically by the finite element method. In this approach, the confinement potential profile of the interdiffused quantum well structure is nonlinear and is modelled by an error function and, in particular, the nature of the effective mass of an electron is considered. The results show that the number of eigenstates and energy levels varies with the extent of the interdiffusion. Numerical results for the quasi-bound states in the quantum well structure with an applied electric field are also presented.