The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.

周期时变线性系统系数矩阵的时变性与不可交换性是其精细积分算法设计中的瓶颈。

Probability integration method of stochastic media expectation theory, which bases on the foundation of flaccid up-cover terrane and bestraddle of top board, is discontinuous media theory.

随机介质预计理论概率积分法是建立在上履岩层软弱、顶板跨落基础上的非连续介质理论。