نتایج جستجو برای: nonlinear age structured population models

تعداد نتایج: 2416171  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زبانهای خارجی 1388

this study investigated the potential role of age in inductive and deductive grammar learning among iranian foreign language learners. the experimental population consisted of our randomly selected samples including two groups of children (with age of exposure to english within 8-13), and two groups of adults (with age of exposure to english within 11-13). thus, the comparison was between ch...

2011
Vipul K. Baranwal Ram K. Pandey Manoj P. Tripathi Om. P. Singh

Three analytic algorithms based on Adomian decomposition, homotopy perturbation and homotopy analysis methods are proposed to solve some models of nonlinear age-structured population dynamics and epidemiology. Truncating the resulting convergent infinite series, we obtain numerical solutions of high accuracy for these models. Three numerical examples are given to illustrate the simplicity and a...

Journal: :Electronic Journal of Qualitative Theory of Differential Equations 2016

Journal: :Journal of Mathematical Analysis and Applications 1985

2010
Blaise Faugeras Olivier Maury

The goal of this paper is to present a generic multi-region nonlinear age-size structured fish population model, and to assess its mathematical well-posedness. An initial-boundary value problem is formulated. Existence and uniqueness of a positive weak solution is proved. Eventually, a comparison result is derived : the population of all regions decreases as the mortality rate increases in at l...

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