本文讨论了材料退化失效的基本概念，给出了微观结构随机演化的动力学方程，统一导出了失效几率，可靠性、失效几率密度、失效率和平均寿命。
Some key concepts in degradated failure of materials is discussed. The stochastic evolution equation of defect clusters is given and the failure probability reliability and failure rate are derived.
工程项目生态系统的演化、平衡和生命系统一样，是个非线性的耗散结构，其演化和平衡满足逻辑斯谛模型。
It is a nonlinear dissipative structure, the same as life system in respect of evolvement and balance. The Logistic model meets the condition of construction project system development.
工程项目生态系统的演化、平衡和生命系统一样，是个非线性的耗散结构，其演化和平衡满足逻辑斯谛模型。
It is a nonlinear dissipative structure, the same as life system in respect of evolvement and balance. The Logistic model meets the condition of construction project system development.
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