推导了基于NASA标准解体模型的碎片分离速度概率密度函数，建立了计算航天器与单颗碎片碰撞概率的时间积分算法。
Space debris delta-velocity probability density function was deduced by NASA's standard breakup model, and time integral algorithm of collision probability between spacecraft and any debris was built.
并举例说明这些特征在电子-离子碰撞的积分计算中的应用。
A example about their applications to integral calculations in electron-ion collision is given.
在发生碰撞时，采用可变积分步长的方法提高系统的稳定性。
When the collision happens, we use the method of changeable integration step to improve the simulation systems stability.
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