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.
阐释了知识链及其生命周期，将知识链的生命周期划分为酝酿期、组建期、运行期、解体期四个阶段，分析了生命周期各阶段中知识链管理的流程和内容，构建了基于生命周期的知识链管理框架模型。
Moreover, a frame model of knowledge chain management based on life cycle is constructed, after it discusses on the process of knowledge chain management in every phase of life cycle.
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