An improved return stroke model (du model) that is both physically oriented and has a relatively straightforward mathematical basis is introduced.
介绍了一种改进型雷击模型，它既兼有雷击本身的特点，又具有相对简洁的数学基础。
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。
The utility model discloses a novel drilling machine, mainly comprising a drilling machine head case, a linear slideway, a stroke sliding plate, a return tension spring and the like.
本实用新型公开了一种新型钻床，该钻床主要由钻床机头箱、直线滑道、行程滑板、回位拉簧等组成。
The utility model discloses a novel drilling machine, mainly comprising a drilling machine head case, a linear slideway, a stroke sliding plate, a return tension spring and the like.
本实用新型公开了一种新型钻床，该钻床主要由钻床机头箱、直线滑道、行程滑板、回位拉簧等组成。
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