根据电位和法向导数，可用数值方法计算地面的电位和电场强度。
According to the potential and its normal derivative on the surface, the potential and field intensity on the ground can be calculated by a numerical method.
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。
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.
目前，红细胞边缘形态的检测一般都是利用传统的边缘检测方法，如边缘临近一阶或二阶方向导数法，利用简单的方法来检测边缘。
At present, the methods of edge detection of erythrocyte are using traditional theory such as edge one-order or second-order orient differential coefficient and using simple methods to detect edge.
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