Based on different demand cases, a single point estimation method based on demand approximation and an analytical expression method based on traffic equilibrium model were put forward.
针对不同的需求情形，分别提出了求解交通平衡模型的基于需求点逼近的点估计法和基于模型的表达式分析法。
Using an approximate analytical method, the explicit expression of stress concentration factors is derived for an eccentric circular hole in a tension orthotropic finite-width strip.
用近似解析方法推导出拉伸正交各向异性有限宽板偏心圆孔的应力集中系数的显式表达式，除了比较极端的情况外，该式的精度较好。
The analytical expression of the density of trapping charges is proposed. The method and the results of parameters extraction are also presented.
给出了陷阱电荷密度的解析表达式和相关参数的提取方法和结果。
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