Context. With the launch of space missions devoted to asteroseismology (like COROT), the scientific community will soon have accurate measurements of pulsation frequencies in many rapidly rotating stars. Aims. The present work focuses on the effects of rotation on pulsations of rapidly rotating stars when both the Coriolis and centrifugal accelerations require a non-perturbative treatment. Meth...

Abstract The Cauchy problem for the three-dimensional Euler–Boltzmann equations of a polytropic, ideal and isentropic fluid in radiation hydrodynamics is considered. The formation of singularities in smooth solutions is studied. It is proved that some C1 solutions, regardless of the size of the initial disturbance, will develop singularities in a finite time provided that the initial disturbanc...

Studied the toxic effects polyoxipropylenpolyols in acute and subacute experiments on warm-blooded animals. It is established that they are pertained to the IV hazard class; have polytropic general toxic effect; on the level of toxic doses they influence on the generative function and the genetic apparatus; inhibit and disrupt the interaction between the cellular and humoral immunity.

For dyanmic background models of Goldreich & Weber and Lou & Cao, we examine three-dimensional perturbation properties of oscillations and instabilities in a general polytropic homologously collapsing stellar core of a relativistically hot medium with a polytropic index γ = 4/3. Perturbation behaviours, especially internal gravity g−modes, depend on the variation of specific entropy in the coll...

Since 2001, Frauscher Thermal Motors have been conducting research in the field of thermodynamic machines, particular Stirling engines various types. One important development step is invention a engine an alphagamma® configuration. In this configuration, expansion piston designed as differential with its ring surface connected to cold volume. paper, design advantages configuration comparison t...

Non-ideal fluids are generally subject to the occurrence of non-isotropic pressure tensors, whose determination is fundamental in order characterize their dynamical and thermodynamical properties. This requires implementation theoretical frameworks provided by appropriate microscopic statistical kinetic approaches terms which continuum fluid fields obtained. In this paper, case non-relativistic...

We discuss steady-state transonic outflows obtained by direct numerical solution of the hydrodynamic and magnetohydrodynamic equations. We make use of the Versatile Advection Code, a software package for solving systems of (hyperbolic) partial differential equations. We proceed stepwise from a spherically symmetric, isothermal, unmagnetized, non-rotating Parker wind to arrive at axisymmetric, p...

We consider the problem of resolving all pairwise interactions of shock waves, contact waves, and rarefaction waves in 1-dimensional flow of an ideal polytropic gas. Resolving an interaction means here to determine the types of the three outgoing (backward, contact, and forward) waves in the Riemann problem defined by the extreme left and right states of the two incoming waves, together with po...