Based on this, the evolution equations, evolution laws of elliptical Hermite-Gaussian light beam's every variable and two critical powers are also derived using variational method.

在此基础上，运用变分法得到了椭圆厄米高斯光束各参量的演化方程、演化规律和两个临界功率。

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Finally, Using the method of calibrating instrument in a variational concentration calibrates this instrument. According to the result, the performance of the instrument is analyzed.

最后采用非恒定浓度的测氡仪器标定方法对研制的仪器进行标定，分析了仪器的一些性能指标。

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A finite element method using subregion variational principle and spline function in this paper is presented to solve the problem of combined shell of revolution.

本文提出一种用分区变分原理和样条函数相结合的有限元方法，解决组合型旋转壳受力分析问题。

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