... persistent existence持续生存 existence conditions存在条件 existence of extremum极值的存在 ...
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污染与捕获对种群系统的影响分析 Keywords: Population; Environmental Pollution; Capture; Persistence; Extinction [gap=305]关键词： 种群；环境污染；捕获；持续生存；绝灭
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Finally, by using the method of topological degree, we obtain the existence of positive periodic solution of three species predator-prey system with nonautonomous delay. We also discuss the effect of delay on permanence and periodic solutions of the system.
利用拓扑度的理论给出了具有时变离散时滞的三种群捕食食物链系统正周期解的存在性,得到了时滞的大小对种群的持续生存及系统周期行为的影响。
参考来源 - 时变种群动力系统解的渐近性态Sufficient conditions for uniform persistence of this model are obtained via uniform persistence of infinite dimensional discrete dynamical systems.
然后在一致持续生存的条件下得到了该系统周期解的存在性。
参考来源 - 恒化器系统的建模与稳定性分析·2,447,543篇论文数据，部分数据来源于NoteExpress
这是一种对人类持续生存具有潜在致命威胁的有机体。
This is an organism that is potentially deadly to the continued survival of human beings.
由于某种原因，这种语言持续生存下来了。
进而，利用李雅普·诺夫函数和比较定理确定了持续生存的条件。
Conditions for permanence is established via the method of comparison involving multiple Liapunov functions.
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