background: the current study was conducted to estimate the integrated mean of quality of life (qol) of the general population of different countries around the world and to compare them on the grounds of the human development index (hdi). methods: well-known international databases such as medline, scopus, science direct, google scholar & google, and domestic databases including sid, iranmedex...

Abstract. The Sharpe-Lotka-Mckendrick-von Foerster one-sex population model and Fredrickson-Hoppensteadt-Staroverov two-sex population one are well known in mathematical biology. But they do not describe dynamics of populations with child care. In recent years some models were proposed to describe dynamics of the wild population with child care. Some of them are based on the notion of the densi...

Abstract In order to better understand the interplay of partnership and competition in population dynamics we study a family of generalized May-Leonard models with N species. These models have a very rich structure, characterized by different types of space-time patterns. Interesting partnership formations emerge following the maxim that ”the enemy of my enemy is my friend.” In specific cases c...

We study spectral properties of convolution operators L and their perturbations H = L+ v(x) by compactly supported potentials. Results are applied to determine the front propagation of a population density governed by operator H with a compactly supported initial density provided that H has positive eigenvalues. If there is no positive spectrum, then the stabilization of the population density ...

Taking the Guangxi Beibu Gulf Economic Zone as the study area, this paper utilizes the geographical detector model to quantify the feedback effects from the terrestrial environment on precipitation variation from 1985 to 2010 with a comprehensive consideration of natural factors (forest coverage rate, vegetation type, terrain, terrestrial ecosystem types, land use and land cover change) and soc...

Hans Geser Zuerich, September 2011 Abstract The association between leftism and ecologism is analyzed comparatively in a sample of 27 countries, based on data stemming from the fifth wave of World Values Survey (conducted 2005-2007). As a first major result, it is found that the Western countries (encompassing Western European, USA, Canada and Australia) stand out as a distinct group with a hig...

The aim of this article is to present a methodological approach for problems encountered in structural analysis. This approach is based upon the pretopological concepts of pseudoclosure and minimal closed subsets. The advantage of this approach is that it provides a framework which is general enough to model and formulate different types of connections that exist between the elements of a popul...

BACKGROUND In many countries, there is a surplus of physicians in some communities and a shortage in others. Population size is known to be correlated with the number of physicians in a community, and is conventionally considered to represent the power of communities to attract physicians. However, associations between other demographic/economic variables and the number of physicians in a commu...

The main result of this article states that one can get as many as D + 1 modes from just a two component normal mixture in D dimensions. Multivariate mixture models are widely used for modeling homogeneous populations and for cluster analysis. Either the components directly or modes arising from these components are often used to extract individual clusters. Although in lower dimensions these s...