Precisely describing the formation and evolution rules of coal-rock fracturing crack have great value on reservoir fracturing improvement and highly efficient mining of coal bed methane well. In this paper, a non-linear dynamic method is used to study crack damage evolution behavior of coal-rock fracturing. Considering distribution characteristics of natural cracks in coal-rock, and based on da...

This article presents a comprehensive review of chaos embedded meta-heuristic optimization algorithms and describes the evolution of this algorithms along with some improvements, their combination with various methods as well as their applications. The reported results indicate that chaos embedded algorithms may handle engineering design problems efficiently in terms of precision and convergenc...

background: to compare the efficacy of two routes of prostaglandin e 2 administration (intravenous and intramuscular) for treatment of missed abortion this study was conducted. regarding the pilot cases of missed abortion admitted for termination of pregnancy intravenous administration of pge2 that had higher efficacy compare to intramuscular route, investigators designed this study. methods: i...

introduction hepatitis b infection remains a major health problem worldwide and is an important cause of morbidity and mortality. since it is transmitted parenterally, investigation of new cases of hepatitis b infections for potential routes of transmission plays a crucial role in controlling hepatitis b infection in the community. case presentation in this study, we reported a new case of hepa...

In opto-mechanical systems, the nonlinearity caused by radiation pressure can lead to chaos and other abundant dynamical phenomena. Chaos is an important branch of nonlinear dynamics, routes from order in various systems are research focus for academics. this paper, we investigate chaotic dynamics a system consisting two evanescently coupled identical cavity subsystems, which optical fields whi...

The peroxidase–oxidase (PO) reaction involves the oxidation of reduced nicotinamide adenine dinucleotide by molecular oxygen. When both reactants are supplied continuously to a mixture containing enzyme and phenolic compound, will exhibit oscillatory behavior. In fact, exhibits zoo dynamical behaviors ranging from simple periodic oscillations period-doubled mixed mode quasiperiodicity chaos. ro...

in our country, school bus routes are determined by experiments of driver without considering the scientific optimum route and location. traversing additional routes will always result an increase in vehicle movements and fuel consumption and enormous costs. hence, this paper will study the school bus routing in tehran considering special students and a model will be presented to minimize trave...