To do that, the integral definition of vector magnetic potential and the Lorentz gauge is used to expand the integral equation of the PEEC model.

为此它以矢量磁位的积分表达式和洛仑兹规范代替了矢量磁位和标量电位的积分表达式，对积分方程进行展开。

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A stable and accurate integral closed algorithm is presented, which is used to solve multiplicative Langevin equation describing the directed motion of a particle in a periodic potential.

提出一种稳定和精确的坐标变换和闭合积分方法，用以求解描述周期势场中布朗粒子作定向运动的乘性朗之万方程。

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Afterwards, using the boundary element method to solve the integral equation we can obtain the magnetic potential and its normal derivative on the surface of the magnetic body.

然后用边界单元法解积分方程，求得磁性体表面的磁位及其法向导数。

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