从分析地震能积累的动态方程入手，推导出了估计强震复现时间的分形估计法。
Based on the dynamic equation of the seismic energy accumulation, a method for estimating the strong earthquake recurrence period by the fractal principle has been deduced in this paper.
利用几何学知识推导出了确定电力系统实用动态安全域（PDSR）临界超平面的截距法。
An intercept method to determine critical hyper-planes of practical dynamic security region (PDSR) of power system is developed by use of knowledge of geometry.
根据废水处理理论并分析比较活性污泥法有关模式的假设和推导过程，作者导出了稳态条件下厌氧流化床的动力学模式。文中还提出稳态和动态的流化模式。
Based on the theory of wastewater treatment and relevant models of activated sludge processes, a kinetic model of the anaerobic fluidized bed reactor under steady state conditions is developed.
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