将任意分布的电流源产生的电磁场看作是电偶极子产生的电磁场的叠加，利用镜像法推导了上半空间中的垂直直流电偶极子在两层媒质中产生电磁场的解析解。
The analytical expressions of the electromagnetic field generated by the DC electric dipole in the upper space for the two-layer mode were obtained by using the method of mirror image.
串联电阻法与双线圈换接法是两种提高直流电磁开关返回系数的常用方法。
In this paper two methods to elevate the return factor of the d.
串联电阻法与双线圈换接法是两种提高直流电磁开关返回系数的常用方法。
In this paper two methods to elevate the return factor of the d.
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