The exact integral of motion Q is found for the Takagi equations. These are transformed from the system of two differential equations with partial derivatives to the system of two ordinary differential equations. The RSMR spectra are analyzed for the cases of perfect and deformed single crystals excited by ultrasound. An oscillatory Q-dependence of the total intensity of diffracted beam and RSMR spectrum is found.Es wird das exakte Integral der Bewegung fur die Takagi-Gleichungen gefunden. Dicse Gleichungen werden aus dem System von zwei Differentialgleichungen mit partiellen Ableitungen in das System gewohnlicher Differentialgleichungen umgeformt. Das MoBbauerspektrum bei Ultraschallanregung wird fur perfekte und gestorte Kristalle analysiert. Es werden oszillierende Q-Abhingigkeiten in der Gesamtintensitit der gebeugten Welle und im MoBbauerspektrum gefunden.

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The relaxation of the complex magnetic susceptibility in ferrites depending on temperature, frequency of the ac magnetic field, the concentration of relaxators, and the time which is passed after sample demagnetization (disaccomodation) is discussed. A strict solution of Neel's equation for the motion of a domain wall is found. Various asymptotic approximations of general solution are evaluated and compared with the results of other authors. The conclusions from the solution obtained, in particular, disaccomodation of the imaginary component of the susceptibility are discussed. It is demonstrated that under specific conditions disaccomodation of the imaginary component of the susceptibility differs from that of its real component.