This study is concerned with the effects of modulation on magnetic resonance which are due to changes in the longitudinal magnetization of a specimen during modulation and adiabatic sweep through a steady magnetic field. The analysis covers various amplitudes and rates of harmonic modulation of the field. Formulas are derived for the corrections to the form functions of resonance curves.

An approach is developed for analyzing fluctuation effects in quasiharmonic oscillators formed by connecting a nonlinear inertialess element to a resonator. The effect of the nonlinear element on the resonator is treated as a pulsed process. It is assumed that the effect of noise on the system destroys the coherence and changes the response parameters of the resonator to pulse effects, this, ultimately, being responsible for the amplitude and frequency fluctuations. An equation is obtained that describes the fluctuations of the oscillation period. A detailed study is made of the fluctuations of the period in an electronic oscillator due to white noise.