螺旋桨表面和它的尾涡面离散为四边形双曲面元，每个面元上布置等强度偶极子和源汇分布。
The surface of propeller and its trailing vortex is divided into a number of small hyperboloidal quadrilateral panels with constant source sink and doublet distributions.
本文利用心脏磁场单磁偶极子模型研究了心脏磁场强度检测信号的频域空间滤波法。
Based on single magnetic dipole model, the spatial filtering method of cardiac magnetic signal in the frequency domain was investigated.
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