搜索 - 科创

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以前用手抓220V变压器初级的两根线,然后接到电池上面再断开, 断开时候的感觉很爽~~ 给一个空心电感通电, 然后断电, 波形如下图~ 会产生一个反电势, 说明电感断电的一瞬间周围磁场并没有马上消失...

我记的过去在科创有人提出过.并大约记的.因为不是每次发射位置磁场等都这么准确的容易给拉回来.所以没有什么人做这个.....我现在的想法...是脉冲直流有可减少对开关的的要求.用可控硅就行.而关断上用空...

拉瓦尔喷管（亦称渐缩渐阔喷管）是瑞典人拉瓦尔在1883年在蒸汽涡轮机上应用的喷管。喷管的截面积首先变小然后再变大，从中间通过的气体可被加速到超音速，而并不会产生撞击。气体在截面积最小处恰好达到声速。 ...

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