利用所得到的结果，分析了数值微分法和经验公式的计算精度。
By use of the result, the calculating precision of numeric differential method and empirical formula is analyzed.
基于模拟的CHAMP卫星观测数据，分别用数值微分法和能量守恒法恢复50阶次的重力位系数。
Numerical differential method and energy balance approach are applied respectively to recover the geopotential coefficients until 50 degree based on the simulated observation datum of CHAMP.
从建立观测方程的角度来说，主要研究了三种恢复地球重力场的方法：(1)数值微分法，(2)能量守恒法，(3)数值积分法。
Three methods for gravity field recovery are mainly studied from the views of observation equation, (1) numerical differential method, (2) energy balance approach, (3) numerical integration method.
特征提取是葡萄干等级检测的基础，该文在研究极惯性矩计算长短轴方法的基础上，提出一种利用数值微分法进行长短轴检测的新方法。
Based on studying the way of polar moment of inertia, a new method of major and minor axis detecting by DDA was provided.
本文采用有限差分法求解偏微分方程(即定价模型)的数值解。
In solving partial differential equation (i. e. pricing model), the author adopted the finite difference method to get its numerical solution.
精细积分法是求解常微分方程的一种成熟的数值算法。
Time precision integration method is a mature numerical algorithm to solve the ordinary differential equation.
介绍了辐射多孔体的辐射传热特性，采用微分法对方形孔道辐射多孔体的辐射角系数进行了数值分析。
The paper introduced radiation heat-transfer speciality of radiant porous body, and analyzed radiation Angle coefficient of radiant porous body with square aperture by using numerical differentiation.
介绍了辐射多孔体的辐射传热特性，采用微分法对方形孔道辐射多孔体的辐射角系数进行了数值分析。
The paper introduced radiation heat-transfer speciality of radiant porous body, and analyzed radiation Angle coefficient of radiant porous body with square aperture by using numerical differentiation.
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