本文给出了数值求解一类偏积分微分方程的二阶全离散差分格式。
In this paper, the second order fully discrete difference method for a partial integro-differential equation is considered.
首先通过横向积分将中子扩散方程化为三个互相耦合的一维偏通量方程。
First, the neutron diffusion equation is converted to three coupled one dimensional partial flux equation through transverse integration.
针对SPWM全桥逆变器中存在的直流偏磁现象，提出了数字PI电压积分调节方法。
A digital PI voltage integral regulating method, as proposed in the paper is directed at overcoming the flux imbalance phenomena in the SPWM full-bridge inverter.
从概率基本公式出发，在偏态分布的约束条件下，经数学推导；建立概率积分式。
From a probability basic equation through mathematical deduction, a probability integral equation is set up in constraint condition of non-normal distribution.
有了边界变量偏导数的终端值以及它们适合的微分方程，就可以由终端反向积分这些微分方程求解出这些变量来。
With the terminal value of the partial derivative for boundary variates and their differetial equation, the variates can be solved by backward derivation of the differetial equation.
通过在积分换元、微分方程求解、多（一）元复合函数求全微分、偏导数及高阶偏导数中的应用举例，论述了一阶微分的形式不变性在微积分学中的作用不应被忽略。
Based on the theory of differential geometry and geodesy, the second order differential equation and the first differential relationship are derived on the regional earth ellipsoid in this paper.
通过在积分换元、微分方程求解、多（一）元复合函数求全微分、偏导数及高阶偏导数中的应用举例，论述了一阶微分的形式不变性在微积分学中的作用不应被忽略。
Based on the theory of differential geometry and geodesy, the second order differential equation and the first differential relationship are derived on the regional earth ellipsoid in this paper.
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