In this study the interaction between self-excited and paramet rically excited oscillations in two-degree-of-freedom systems with quadratic nonlinearities is investigated. The fundamental parametric resonance of the first mode and 3:1 internal resonance is considered, followed by 1:2 internal and parametric resonances of the second mode. The method of multiple time scales is applied to derive f...

An analytical equation of state by Song and Mason is developed to calculate the PVT properties ofmercury. The equation of state is based on the statistical-mechanical perturbation theory of hard convexbodies and can be written as a fifth-order polynomial in the density. There exists three temperaturedependentparameters in the equation of state; the second virial coefficient, an effective molecu...

Modern state is conceptually and subjectively complicated as per the wide range of concepts and subjects related to it, therefore the context is provided to present the viewpoints on its identity and nature. Based on this, human sciences Scientifics investigate it from different perspectives. Complexity of the nature of modern State, arises the various theories around it, despite bring serious ...

food safety issues are not a new issue in science, but due to the dynamic changes in the modern world it is as equally important as decades ago. the aim of the study was to address the efforts in the development of a comprehensive food safety system in serbia, and make specific recommendations regarding the improvement of epidemiological investigation capacity as a useful tool which contributes...

[1] We compare 2-D, quasi-static earthquake nucleation on rate-and-state faults under both ‘‘aging’’ and ‘‘slip’’ versions of the state evolution law. For both versions mature nucleation zones exhibit 2 primary regimes of growth: Well above and slightly above steady state, corresponding respectively to larger and smaller fault weakening rates. Well above steady state, aging-law nucleation takes...

power of the muslim brotherhood after egypt’s revolution of 2011 and effective role in the approval of the constitution in 2012 ,led to be considered the idea of an islamic state by the various media and academic circles . this issue has necessitated need for research on this topic with a focus on the question: what is the idea of an islamic state in the muslim brotherhood's political thou...

abstract: a time domain semi-analytical solution to study thermoelastic creep behavior of  functionally graded rotating axisymmetric disks with variable thickness is presented. the rate type governing differential equations for the considered structure are derived and analytically solved. to solve these  equations, the disk is divided into some virtual sub-domains. general solution of  equilibr...