L.S. Kuz'menkov, M.I. Sitnov

Using the kinetic theory, we consider the change of spectral properties of relativistic plasma when a weak external magnetic field is switched on. In the first approximation with respect to the field, faster-than-light cyclotron waves are absent. The longitudinal wave is transformed into the extraordinary wave in the region of small wave vectors, whose dimension is proportional to the square root of the cyclotron frequency. The dispersion of the ordinary wave in relativistic plasma at finite temperature in a weak field does not differ from the dispersion of the transverse wave in an unmagnetized plasma. The dispersion of the extraordinary wave is determined from a quadratic equation with respect to the square of the frequency of the wave.

V.B. Eflov, Yu.A. Il'inskii

It is shown that the transport equation in an optically inhomogeneous medium can be solved for narrow beam, assuming that the gradient of the refractive index is small. The result can be used for the calculation of the power of radiation incident on a directed receiver after diffuse reflection of the signal from a surface in an optically inhomogeneous medium.

L.I. Antonov, L.E. Korotenko, A.N. Mateev, V.V. Popov

For monocrystalline magnetic films of the type {11l} with cubic and single-axis anisotropies, we study the spectrum of homogeneous states for a given anisotropy parameter $S$, where $S=k_{\perp}-2\pi M^2/k_1$, $k_{\perp}$ and $k_1$, are the first constants of single-axis and cubic anisotropy, respectviely. It is shown that when the anisotropy parameters S changes, orientational phase transitions take place, and the majority of the orientational phase transitions takes place in the region of the values $\left | S \right | < 1$. This region of $S$ is characterized by a considerable increase of the number of magnetic phases. For the majority of cases, the solution is carried out numerically.

V.D. Gora, V.I. Pustovoi, A.P. Sukhorukov, A.K. Sukhorukova

We develop a theory of the generation of exciton-polaritons near the resonance by picosecond and subpicosecond pumping pulses. We analyze analytically and numerically the formation of stationary pumping pulses and excitons in conditions when the field intensity of the direct radiation on the boundary is high.

A.A. Kornilova, A.A. Opalenko

We develop a method for a Mossbauer study at high pressures using radioactive samples, with extraction of radiation via a Bridgman anbil, made from boron nitride. The pressure calibration is carried out by measuring the lattice parameter of NaCl. We obtain Mossbauer spectra of tellurium and tellurium clioxide at pressures up to 110 kbar. In tellurium, we observe a decrease of the quadrupole splitting of the spectrum at pressures above 40 kbar, which corresponds to the points of first-order phase transition.

V.A. Dovzhenko, A.P. Ershov, A.A. Kuzovnikov

It is shown theoretically that the volt-ampere characteristic of a Langmuir probe can be used to determine the average electron energy $<\epsilon>$ in very wide limits of variation of the electron energy distribution function. The required segment of the volt-ampere characteristic lies within the limits $\left(0, \frac{1}{3}<\epsilon>\right)$, and the maximum error in the determination of $<\epsilon>$, due to the deviation of the electron energy distribution function from Maxwellian, does not exceed 50%.

В.И. Шестаков

A.G. Sveshnikov, A.V. Tikhonravov, S.A. Yanshin

We consider some problems in the design of multilayered optical coverings for oblique incidence of light, such as the determination of the required transmission coefficient in unpolarized light, the required transmission coefficient for light of one of two possible polarizations, and the synthesis of a covering for given requirements on the transmission coefficients for waves with various polarizations. We present algorithms for the solution of these problems, and give concrete examples of the synthesis.

A.A. Volkov, A.V. Ievskii, A.V. Kozar, I.A. Levina, E.G. Machulka, V.K. Novik, V.A. Ognevskii, Yu.A. Pirogov, V.I. Tereshchenko, V.P. Fomichev

We develop and test a pyroelectric IR radiometer which is designed for the control of temperature regimes of machine components fabricated on a production line. The temperature control is realized by registering the thermal radiation of heated components in the spectral range 8-12 μm using a pyroelectric radiation sensor. The chosen spectral range makes it possible to operate in conditions of increased humidity and smoke content, and also in the presence of cinder on the components. In the range of measured temperatures 100-1000°C, the error of measurements is ±1-3%, and in the range 1000-1300°C ± 1%. The device operates at a distance from the heated components from 1 to 5 m, and has an internal temperature-calibrated indication system. We foresee the output to a pen recorder, and an inclusion of generators of induction heating in the feedback circuit for the power control.

Yu.P. Drozhzhov

We discuss the effect of a strong modulating field and the presence of random impurity field in the sample on the resonant structure of the coefficient of nonlinear polarizability.