نتایج جستجو برای: nonlinear age structured population models
تعداد نتایج: 2416171 فیلتر نتایج به سال:
Structured projection models (SPMs) are a powerful tool to investigate the dynamics of structured populations, which makes them ideal for study plant species spanning their range life forms, sizes, longevity, and cycle complexity. They one most versatile tools in ecology, with hundreds studied so far wide variety alternative formulations different questions purposes. We revise some salient conc...
This paper is as much about a certain modelling methodology, as it is about the constructive definition of future population states from a description of individual behaviour and an initial population state. The key idea is to build a nonlinear model in two steps, by explicitly introducing the environmental condition via the requirement that individuals are independent from one another (and hen...
Models based on stage structure have found varied applications in population models. This paper proposes a stage structured model to study the trends in the computer and video game playing population of US. The game paying population is divided into three compartments based on their age group. After simulating the mathematical model, a forecast of the number of game players in each stage as wel...
in this paper, a new stage structured prey-predator model with linear functional response is proposed and studied. the stages for prey have been considered. the proposed mathematical model consists of three nonlinear ordinary differential equations to describe the interaction among juvenile prey, adult prey and predator populations. the model is analyzed by using linear stability analysis to ob...
In this paper we study the properties of an age-structured MSEIR epidemic model. Existence, uniqueness and positivity of the strict solution of the problem are proved by using semigroup techniques. Moreover, the expression of the total population density by means of a suitable nonlinear semigroup is given. Finally, a semplified system of ODE is proposed and the equilibrium solutions with stabil...
Structured population models are increasingly used in decision making, but typically have many entries that are unknown or highly uncertain. We present an approach for the systematic analysis of the effect of uncertainties on long-term population growth or decay. Many decisions for threatened and endangered species are made with poor or no information. We can still make decisions under these ci...
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