Computer modelling for evolutionary systems consists in: (1) to store in the memory the individual features of each member of a large population; and (2) to update the whole system repeatedly, as time goes by, according to some prescribed rules (reproduction, death, ageing, etc.) where some...

The extended XY-model, a classical system of planar rotators with nearest neighbor interaction, is studied with molecular dynamics simulations. This model exhibits a first-order phase transition between a low-temperature phase with algebraic decay of spatial correlations and a high-temperature...

Based on both the theories of cellar biology and the results of experimental observations a dynamical model of birth and death-diffusion type has been suggested for popular growth of bacillus and evolution of nutrition in the single-species bacillus system with a growth–propagation source. It...

This article is an empirical evaluation of the choice of fixed cutoff points in assessing the root mean square error of approximation (RMSEA) test statistic as a measure of goodness-of-fit in Structural Equation Models. Using simulation data, the authors first examine whether there is any...

Scholars interested in the speed with which each of the two major US political parties selects its presidential nominee focus on delegate allocation rules and voter preferences as possible sources of variation, but disagree as to the impact of each. I use computer simulations to explore the...

Williams and Bjerknes proposed a simple stochastic growth model to describe the tumor growth in the basal layer of an epithelium. In this work we generalize this model by including the possibility of saturation in the tumor growth as it is clinically observed. The time evolution of the average...