通过直接积分得到了有限长密绕矩形螺线管自感系数的精确表达式，并对结果进行了图示和讨论。
The exact expression is obtained by integration method for a tightly wound rectangular solenoid of finite length, the result is plotted and discussed.
为实现在将曲轴水平放置绕主轴转动条件下，对单拐或多拐曲轴的主轴和曲柄轴进行激光淬火和激光熔覆，建立了激光作用于曲拐表面形成螺线时的光斑轨迹方程。
It aims to realize the laser quenching and cladding for the principle axis and crank of single or more crank while the crankshaft is laid horizontally and rotating around the principal axis.
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