Structured populations: The stabilizing effect of the inflow of newborns from an external source and the net growth rate
نویسنده
چکیده
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 reproduction rate we introduce a net growth rate and discuss how this net growth rate can be related to our stability/instability conditions.
منابع مشابه
External Factors Affecting Firm Growth: Evidence from Small Scale Manufacturing Firms in Tigray Regional State of Ethiopia
It is widely agreed that small scale enterprises (SSEs) used to play a crucial role in achieving the industrial and economic development. Though SSEs play indispensable economic role, studies are limited to analyze the external factors that affect the growth of SSEs independently. Therefore, the objective of this paper is to examine the effect of external firm factors influencing small scale ma...
متن کاملNumerical Investigation on Contaminant Dispersion from a Source over the Blocks in Steady and Unsteady Flows
This paper deals with numerical study of semi-finite incompressible flow of air over two blocks with different heights in the presence of a condensing-source, dispensing- contaminant in the flow, in both steady and unsteady states. The numerical solution of governing PDE equations are constructed by a finite-volume method applied on structured grid arrangement. The effects of air flow velocity,...
متن کاملAn Examination of Taxation Effect on Interest Rate of Bank Deposits on Gross Domestic Product: Dynamic Stochastic General Equilibrium
Recently, the topic of taxation on the interest rate on bank deposits has become o one of the new debates among economists and politicians. In this regard, the purpose of this study is investigation of the effect of taxation on the interest rate on bank deposits on gross domestic product using the Dynamic stochastic general equilibrium model in period of 1981 to 2016. The results of the resear...
متن کاملHow Does Inflow of FDI Affect Economic Growth in East Asia?
In this paper, we address the question that does FDI alone affect economic growth or interaction of FDI and human capital is required to boost economic growth. We develop the model with an expanding variety of products. We estimate the model using some advanced tests utilizing data on FDI flows from developed countries. We find stronger complementary effects between FDI and human capital on the...
متن کاملThe effect of rice husk as an insoluble dietary fiber source on intestinal morphology and Lactobacilli and Escherichia coli populations in broilers
Background: There are some reports on the positive effectsof dietary insoluble fiber on the performance of broilers. Objectives: This study was carried out to determine theeffect of inclusion rate and particle size of rice husk in the diet of broilerson the ileal and cecal bacteria populations and small intestine morphology. Methods: The experimental diets consisted of a control husk-free diet...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Applied Mathematics and Computation
دوره 199 شماره
صفحات -
تاریخ انتشار 2008