نتایج جستجو برای: nonlinear age structured population models

تعداد نتایج: 2416171  

Journal: :Mathematical Modelling of Natural Phenomena 2018

Journal: :Journal of Mathematical Analysis and Applications 1990

Journal: :Applied Mathematics and Computation 2008
Jozsef Z. Farkas

We investigate the effect of a positive population inflow of individuals from an external source on the dynamical behaviour of certain physisologically structured population models. We treat a size-structured model with constant inflow and nonlinear birth rate and an age-structured model with nonlinear (density dependent) inflow and linear birth rate. Analogously to the inherent net reproductio...

2005
Xubo Wang Robert D. Sidman

In this dissertation, some size-structured population models are studied.In Chapter 1, a quasilinear size-structured model that describes the dynamics of apopulation with n competing ecotypes is studied. Under the assumption that the vitalrates of each subpopulation depend on the total population due to competition, theconditions on the individual rates which guarantee compe...

Journal: :Journal of Mathematical Analysis and Applications 2000

Journal: :Nonlinear Analysis: Real World Applications 2005

2008
O. Angulo M. A. López-Marcos

We propose a new numerical method for the approximation of solutions to a nonautonomous form of the classical Gurtin-Mac Camy population model with a mortality rate that is the sum of an intrinsic age-dependent rate that becomes unbounded as the age approaches its maximum value, plus a non-local, non-autonomous, bounded rate that depends on some weighted population size. We prove that our new q...

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