V.S. Tumanov

A relationship is considered between the NMR line positions and the relative signs of the spin-spin interaction parameters; spectra from three groups of equivalent nuclei are used to derive the general rules for determining the signs ABC spectra are especially considered. The method can be generalized to a system with a large number of groups of equivalent nuclei.

E.V. Stupochenko

Some basic quantities in nonequilibrium thermodynamics are generalized to discuss relaxation processes in a mixture of a diatomic gas with a light inert gas having a substantially nonmaxwellian distribution for the light particles. Also, theorems from nonequilibrium thermodynamics are generalized to stationary states. The general case of a stationary state without minimal generalized entropy production is considered, along with stationary states for which the generalized entropy production is minimal.

A.Yu. Klement'eva and A.V. Tikhonravov

Simple expressions have been derived for the reflection coefficient, absorption, and phase shift of a quarter-wave dielectric mirror, which incorporate the absorption in the films; features of the mirror implied by the formulas are discussed.

I.P. Zvyagin

Current relaxation and the frequency dependence of the jump conduction have been examined via percolation arguments and hypothesis on the behavior of the correlation length near the threshold corresponding to the formation of an infinite bond cluster. It is shown that the relaxation at large times and the frequency dependence of the conduction over a wide frequency range are governed by a universal function that is the solution to a transcendental equation whose only parameter is a critical value. This function is of power-law type over a restricted frequency range, and the exponent varies between 0.5 and 1.

N.M. Ievskaya, Yu.V. Pavlov, and R.M. Umarkhodzhaev

A study has been made of methods of stabilizing the output intensity at 253.7 nm from an electrodeless high-frequency discharge in mercury vapor. The intensity distribution in the spectrum varies with the temperature of the sidearm and the input power; working temperature ranges have been defined to provide maximum stability for discharges of the first and second kinds. A stabilizer has been built that provides an intensity stability of about 1% over a period of 2 hr without thermal stabilization of the sidearm.

L.S. Kuz'menkov and P.A. Polyakov

The Landau problem is considered for an initial perturbation in a relativistic plasma, with correction for radiation retardation. The damping due to the latter factor exceeds the Landau damping for the waves in a plasma of concentration $10^9—10^14 cm^{-3}$ if the phase velocity is substantially larger than the electron thermal velocity.

V.A. Bushuev, A.V. Kolpakov, R.N. Kuz'min, E.M. Sapryкin, and D.A. Shalabaev

I.I. Minakova, V.I. Panov, and S.Yu. Pashin

In this paper'is considered the effect of fluctuations and of destabilizing factors on the long term frequency stability and on the oscillator line width of three-cavity microwave oscillators with a stabilizing superconducting resonator. For a real oscillator with a tunnel diode the conditions are analyzed for the achievement of relative frequency fluctuations $≤10^{-15}$

D.L. Chetverikov and G.A. Chizhov

Using the methods of classical theory, we examine the motion and radiation of a charge in the field of a circularly polarized amplitude-modulated plane wave. The angular distribution of intensity for radiation by particles is studied both for the case of a harmonically modulated incident wave, and for arbitrary amplitude modulation with polarization effects taken into account. We obtain the total intensity of radiation for the scattering of an amplitude-modulated wave by a charge.

A.G. Belov and E.P. Rashevskaya

The reflection spectra of single crystals of Pb{0,8}Sn{0,2}Te and epitaxial films of Pb{0,8}Sn{0,2}Te on a substrate of PbTe were investigated in the wavelength range 20-200 μm at temperatures of 300 and 115°K. The statistics of the free carriers for the Kein zones, the Hall constant, and the plasma frequency are calculated as a function of the position of the Fermi level.