Гамильтоновский формализм для уравнений феррогидродинамики
The Hamiltonian description of ferrohydrodynamics equation for a ideal nonconducting compressible magnetic fluid with frozen-in magnetization is presented.
The dynamics of ferrofluids is discussed on the basis of Maxwell’s equations and the balance equations for mass, momentum, angular momentum, and energy. It is shown that the requirement of irreversible thermodynamics that the local rate of entropy production be positive definite allows equations of motion, and a corresponding magnetic relaxation equation, characterized by free convective parameters.
A method based on the spectral analysis of thermowave oscillations formed under the effect of radiation of lasers operated in a periodic pulsed mode is developed for investigating the state of the interface of multilayered systems. The method is based on high sensitivity of the shape of the oscillating component of the pyrometric signal to adhesion characteristics of the phase interface. The shape of the signal is quantitatively estimated using the correlation coefficient (for a film–interface system) and the transfer function (for multilayered specimens).