本文把环境温度梯度作为一个变量引入LEC法生长的理论模型中进行分析，得到了晶体中温度分布的表达式。
This paper presents an expression for temperature distribution in growing crystal by considering the ambient temperature gradient as a variable introduced in LEC model.
由能量方程出发，引入新变量，用旋转矢量法讨论了三线摆大角度摆动时的周期。
New variable is introduced based on energetic equation, the period of vibration of three wire pendulum is studied using the method of rotating vector.
同时，引入变量代换，基于线性规划的单纯形法，提出该类绝对值规划问题的全局优化求解算法。
Based on variable substitution and the simplex method for linear programming, the paper also discusses the global optimization algorithm for the absolute value programming.
法具有求解变量少、计算代价小的优点，引入绕组的耦合电压项后，可用于电力变压器的计算。
The t formulation has advantages of fewer unknown variables and less computing cost. It can be used in computations of transformers when coupled voltage items of windings are introduced in the model.
它不必引入人工变量而可在一种表格之下直接应用旋转运算而获得，之后就在同一张表格下完全和单纯形法一样求最优解。
It can be obtained by applying directly twist operation under a table and need not input artificial variable. After this, we may find optimal solution under the table as the same as simplex method.
它不必引入人工变量而可在一种表格之下直接应用旋转运算而获得，之后就在同一张表格下完全和单纯形法一样求最优解。
It can be obtained by applying directly twist operation under a table and need not input artificial variable. After this, we may find optimal solution under the table as the same as simplex method.
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