Aim Latitudinaland regional-scale studies of reptile diversity suggest a predominant temperature effect, unlike many other vertebrate richness patterns which tend to be highly correlated with both temperature and water variables. Here I examine montane gradients in reptile species richness with separate analyses of snakes and lizards from mountains around the world to assess a predominant tempe...

How well do you know your favorite computational model of cognition? Most likely your knowledge of its behavior has accrued from tests of its ability to mimic human data, what we call local analyses because performance is assessed in a speciÞc testing situation. Global model analysis by landscaping is an approach that “sketches” out the performance of a model at all of its parameter values, cre...

in this paper, a new stage structured prey-predator model with linear functional response is proposed and studied. the stages for prey have been considered. the proposed mathematical model consists of three nonlinear ordinary differential equations to describe the interaction among juvenile prey, adult prey and predator populations. the model is analyzed by using linear stability analysis to ob...

In this paper, we present an algorithm for global minimization of real-valued increasing positively homogeneous (IPH) functions with a single constraint which is a modified version of the cutting angle method. We report results of numerical experiments which demonstrate the efficiency of the proposed algorithm.

We obtain global stability lobes of two models of turning processes with inherit nonsmoothness due to the presence of state-dependent delays. In the process, we transform the models with state-dependent delays into systems of differential equations with both discrete and distributed delays and develop a procedure to determine analytically the global stability regions with respect to parameters....

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Understanding how services operate as part of large scale global networks, the related risks and gains of different network structures and their dynamics is becoming increasingly critical for society. Our vision and research agenda focuses on the particularly challenging task of building, analyzing, and reasoning about global service networks. This paper explains how Service Network Analysis (S...

The paper concerns influences of global warming on a climate change in Georgia and health of the population. In particular, one important parameter of a human thermal comfort a heat index(that represents a combination of the air temperature and relative humidity) has been investigated. The investigation was carried out on the base of real data collected in the Ministry of Preservation of the En...