This paper investigates several equiyalent propositions of minimal curve surface by means of the euler equation of calculus of variations .
本文通过变分法欧拉方程推导出极小曲面的几个等价命题。
After dispersing, the calculus of variations equation turn to FEM equation group and solve the equation group to gain the electromagnetic value.
离散后变分方程化为有限元方程组，求解可得口径场的电磁场值。
Based on the heat balance equation of snow surface and the periodic variations of temperature field and heat flow, the Fourier model of snow surface is established.
根据雪面温度域以及热流的周期性特点，在雪地表面热平衡方程的基础上，建立了雪面辐射温度的傅里叶模型。
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