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人口模型中的分岔现象 被引量:2
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作者 罗雪山 《系统工程与电子技术》 EI CSCD 1990年第10期9-12,共4页
在非线性动态系统中可能出现分岔现象,分岔理论为我们研究社会经济系统中的某些异常现象提供了一种新方法。本文研究了人口模型的分岔现象,以此作为示例,体现了用分岔理论研究社会经济系统的过程与步骤。
关键词 人口模型 分岔 非线性系统
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The epidemiological models of Karl-Peter Hadeler
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作者 Klaus Dietz 《Infectious Disease Modelling》 2018年第1期171-175,共5页
The most frequently cited articles out of KP Hadeler's 45 papers with epidemiological applications are summarized.Parasitic diseases which increase the death rate of the hosts proportional to the integer number of... The most frequently cited articles out of KP Hadeler's 45 papers with epidemiological applications are summarized.Parasitic diseases which increase the death rate of the hosts proportional to the integer number of parasites present were described by integral equations for the generating function of the age-and time-dependent number of parasites.A model was derived for a population structured by the continuous level of parasitic infection.Stimulated by the spread of AIDS a new class of epidemic models was developed which take into account explicitly the formation and separation of pairs.For predator-prey populations with parasitic infections threshold conditions for the persistence of the predator were derived.The interaction of epidemics and demography was analysed.Several epidemiological conditions led to backward bifurcations associated with multiple infective stationary states. 展开更多
关键词 Epidemic models Parasitic diseases Pair formation Predator-prey populations Epidemics and demography Backward bifurcation
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