We investigate the impact of cyclic competition on pattern formation in the rock-paper-scissors game. By separately considering random and prepared initial conditions, we observe a critical influence of the competition rate p on the stability of spiral waves and on the emergence of biodiversity. In particular, while increasing values of p promote biodiversity, they may act detrimentally on spat...

We present a comprehensive study of pattern formation in single-field relaxational systems with field-dependent coefficients. A modulated mean-field theory leads to a form amenable to analysis via the geometric architecture developed in our earlier work for systems that exhibit phase transitions between global steady states [Phys. Rev. E 69, 011102 (2004)]. We demonstrate that the phase diagram...

this study has investigated smallholder farmers’ household food security level in mazandaran province during the two times i.e pre-harvest period and post-harvest period. using krejcie and morgan’s detrmining sample table, 384 farmers selected as a sample. a multi-stage sampling technique was used to select preciously subjects. household food insecurity access scale (hfias) was the main tool fo...

a serious hazard to patients during orthotopic liver transplantation is hyperkalemia. although the most frequent and hazardous hyperkalemia occurs immediately after reperfusion of the newly transplanted liver, morbid hyperkalemia could happen in the other phases during orthotopic liver transplantation. however, pre-anhepatic hyperkalemia during orthotopic liver transplantation is rare. this rep...

background: trauma is a major healthcare challenge worldwide. in developing countries, most road deaths happen during the pre-hospital phase; consequently, pre-hospital trauma care has received considerable attention during the past decades. objectives: the aim of this study was to investigate the quality of pre-hospital oxygen therapy in patients with multiple trauma. patients and methods: thi...

In this article we propose models and a numerical method for pattern formation on evolving curved surfaces. We formulate reaction-diffusion equations on evolving surfaces using the material transport formula, surface gradients and diffusive conservation laws. The evolution of the surface is defined by a material surface velocity. The numerical method is based on the evolving surface finite elem...