In this paper a mathematical model was developed to study the dynamics of visceral leishmaniasis (VL) the in Sudan. To develop this model, the dynamics of the disease between three different populations, human, reservoir and vector populations was considered. The model analysis is done and the equilibrium points are analyzed to establish their stability. The threshold of the disease, the basic ...

the purpose of this paper is to examine the determinants of the timing of bank failure/merger in 10 asian countries over the period of 1999-2007 using a multivariate logit model and a split population duration analysis. apart from bank-specific information, we also focus on the effects of macroeconomic and financial characteristics. the following empirical findings are obtained. first, the resu...

This study presents a method to model population densities by using image texture statistics of semi-variance. In a case study of the City of Austin, Texas, we first selected sample census blocks of the same land use to build population models by land use. Regression analyses were conducted to infer the relationship between block population densities and image texture statistics of the semivari...

In many of the special sciences, mathematical models are used to provide information about specified target systems. For instance, population models are used in ecology to make predictions about the abundance of real populations of particular organisms. The status of mathematical models, though, is unclear and their use is hotly contested by some practitioners. A common objection levelled again...

Little is known on how different levels of population heterogeneity and different patterns of human mobility would affect the course of an epidemic in terms of timing and impact. By employing a large-scale spatially-explicit individual-based model, based on a highly detailed model of the European populations and on a carefully analysis of air and railway transportation data, we provide quantita...

Evidences show that divorces are related to the ecnomy, the social contagious as well as to the existence of a gap of happiness between the couple. This paper deals with the mathematical modelling of divorces allowing the estimation of the future divorced population.We use a discrete population model and data from The Spainsh Statistic Institute.

Models of the cultural evolution of language typically assume a very simplified population dynamic. In the most common modelling framework (the Iterated Learning Model) populations are modelled as consisting of a series of non-overlapping generations, with each generation consisting of a single agent. However, the literature on language birth and language change suggests that population dynamic...

The theory of evolution provides examples of stochastic processes which have not yet been treated systematically. We find here many open problems whose solution promises new insights into the general theory. There exists a huge literature on the mathematical theory of evolution and statistical genetics, but existing methods and results are due almost entirely to R. A. Fisher and Sewall Wright.'...

Motivated by the modelling of structured parasite populations in aquaculture we consider a class of physiologically structured population models, where individuals may be recruited into the population at different sizes in general. That is, we consider a sizestructured population model with distributed states-at-birth. The mathematical model which describes the evolution of such a population is...

Through the 21 century, a significant increase in heat events is likely across California (USA). Beyond any climate change, the state will become more vulnerable through demographic changes resulting in a rapidly aging population. To assess these impacts, future heat-related mortality estimates are derived for nine metropolitan areas in the state for the remainder of the century. Heat-related m...