arXiv subjects
Publications and source records attributed to A. G. Kvirikadze.
The article contains the calculation of the efficiency of ideal ferrielectric energy converter, the working body of which is ferrielectric and which converts the heat energy of low-potential water into the electric energy. Its operation is based on the sharp dependence of capacitivity of ferrielectric on the temperature of dielectric-ferrielectric structural phase transition in the vicinity of Curie temperature.
The article contains calculation of the efficiency of the ideal thermomagnetic engine whose working body is ferromagnetic has been suggested. Suggested method being applicable to any heat engine operating on the basis of structural phase transitions in solid bodies.
Well-known Bloch equations describe the spin systems (electronic and nuclear) for any scale of time, from transient processes to steady states. Usually in solids T_2 << T_1. The question arises: what are the approximations that should be made in order the "roughen" Bloch equations to describe the processes at the time T_2 < t < T_1? The answer to this question is given in this article. As an example, the saturation of magnetic resonance is considered under the conditions of harmonic modulation of a constant magnetic field.
The relaxation oscillations of Zeeman and dipole magnetizaions in spin system of a solid paramagnet are theoretically analyzed under conditions of intermediate saturation of magnetic resonance and strong low-frequency modulation of the external magnetic field. Peculiarities of the relaxation oscillations in the synchronous detection regime are considered.
The method, proposed in the given work, allows the application of well developed standard methods used in quantum mechanics for approximate solution of the systems of ordinary linear differential equations with periodical coefficients.
The general principles of the choice of the reduced description parameters of nonequilibrium states γα(t) and the construction of the nonequilibrium statistical operator (NSO) ρ(t) are discussed. On the basis of Kavasaki - Gunton projection operator an explicit non-Markov form of NSO with respect to parameters is obtained and the equivalence of the method to the other methods using boundary conditions for ρ(t) or "mixing" operator is shown. An exact NSO transformation to γα(t) Markov form with respect to γα(t) at arbitrary dependence of Vt perturbation on time is made. The generalized kinetic equations not containing the memory with respect to γα(t) are obtained being convenient for practical application.