After giving their approximate expressions, we focus on the space time distribution of perturbation of magnetic field.
在求得其近似解后，着重讨论其扰动磁场的时空分布。
The improved approximate expressions are proposed to create the sequential approximation problems which are solved with the constrained variable metric method.
用该近似函数形成结构优化原问题的序列近似问题，再用约束变尺度法解近似问题。
With the transmission line model of the lightning return stroke, the approximate expressions of the adjacent field of lightning electromagnetic pulse are obtained.
采用雷电回击电流的传输线模型得到了雷电电磁脉冲场的近场近似。
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