Etching
发表于 2025-3-25 03:26:12
https://doi.org/10.1007/978-3-322-96228-7these simplest models are formulated as initial value problems for systems of ordinary differential equations and are analysed mathematically. Theorems are stated regarding the asymptotic stability regions for the equilibrium points and phase plane portraits of solution paths are presented. Paramete
Ccu106
发表于 2025-3-25 08:33:38
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可触知
发表于 2025-3-25 12:07:59
Physica-Schriften zur Betriebswirtschaftmple models with few assumptions lead to general conclusions of a qualitative nature. More detailed models are useful for quantitative conclusions. However, the comparative merits of simple versus complex epidemiological models are not always readily apparent. The problem of determining an appropria
业余爱好者
发表于 2025-3-25 17:23:12
Das μ-Kriterium im Wiederholensfall forcing by a parameter such as the contact rate, but periodicity can also arise autonomously. Cyclic models of SIRS or SEIRS type can have periodic solutions if there is a large time delay in the removed class. Epidemiological models with nonlinear incidence of certain general forms can have period
Emasculate
发表于 2025-3-25 21:54:43
https://doi.org/10.1007/978-3-642-86589-3 disease was named rubella by Henry Veale in 1866. In 1942 an Australian ophthalmologist, Norman Gregg, noticed that German measles (rubella) infection in the first trimester of pregnancy caused serious birth defects in the offspring. The rubella virus was isolated in tissue culture in 1962 at two d
平常
发表于 2025-3-26 03:12:03
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Chauvinistic
发表于 2025-3-26 04:36:58
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Expiration
发表于 2025-3-26 11:59:34
https://doi.org/10.1007/978-3-658-34520-4hers, in both developed and devloping countries. We survey such information as is currently available about the distribution of incubation times that elapse between HIV infection and the appearance of AIDS, about the fraction of those infected with HIV who eventually go on to develop AIDS, about tim
climax
发表于 2025-3-26 14:15:33
Narrow Thinking und Heuristiken laboratory tests and microcosm studies to field situations, extrapolation across scales. Such extrapolation must be based on some underlying model or models; thus, models are an essential and ineluctable component of ecological risk assessment.
帽子
发表于 2025-3-26 19:05:37
https://doi.org/10.1007/978-3-658-34520-4take and distribution in the aquatic food chain, (b) to illustrate the deterministic time variable behavior of chemical fate models with several applications to the Great Lakes and (c) to develop some statistical models of chemical variability in aquatic organisms, specifically, the fish.