[en] An alternative approach to the determination of the type of interactions in reactions of excited helium atoms quenching: He^* + B -> He + B⁺ + e was considered. It is shown that additional interaction channels depending on the state of the excited atom are involved. These interactions are essentially different from conventional U(R)∼ R^-6 approximation. 15 refs

[en] A regular theory of the dynamics of Freedericksz transition in an oscillating magnetic field for the entire frequency range of magnetic field variation is developed. Consideration is carried out in the case of pure T-deformation. The time of response of the liquid crystal molecules on the external influence is shown to depend not only on the amplitude, but also on the frequency of the magnetic field. 9 refs

[en] Tunable cyclic four block monochromators with intersecting trajectories and symmetric and asymmetric reflections are considered. The degrees of monochromatization and collimation of beams formed in silicon monochromators after different numbers of cycles are calculated. The tunable cyclic silicon monochromators were constructed and the results of experiments carried out with their help well agreed with calculations. 10 refs

[en] The parameters of atomic and magnetic ordering have been measured by means of neutron diffraction analysis and magnetic methods. The long range atomic orders of Ni₃ Fe and Ni₃ V superstructures, as well as the temperatures of Curie and of spin glass (freezing) were obtained. It is shown, that the concentration structure transition is the first kind phase transition and the establishment of long range ferromagnetic order goes together with the formation of cluster spin glass. It was found out that the cluster spin glass was formed by the nucleus of an ordered phase of Ni₃ Fe in paramagnetic matrix Ni₃ V. 9 refs

[en] Optimal parameters of a proton accelerator are discussed for lighting from one side of the reactors of the average power operating below criticality and for use in atomic power plants. 8 refs

[en] The polarization Stokes parameters of radiation of SRS of ruby laser in chloroform after near resonant interaction with potassium vapor were measured. The rotation of axes of polarization ellipse was observed. The theoretical calculation of the rotation angle is shown to be in good agreement with the results of measurements, which may be used for experimental determination of atomic constants, number density of atoms or the interaction length in the medium

[en] The conformations of free radicals arising when the unpaired electron is localized on carbon atoms in pyranose ring of carbohydrate molecule are considered. On the base of the analysis of expected conformations of radicals a possible contribution of β-protons in hyperfine structure of ESP spectra is predicted. The results of conformational analysis for different types of free radicals are in satisfactory agreement with the corresponding experimental data for the liquid phase. 17 refs

[en] The magnetic susceptibility of charge carriers in a size-quantized semiconductor wire with circular cross-section is calculated. The expressions for dia- and paramagnetic susceptibilities are derived both for degenerate gas in the quantum and quasiclassical limits and for nondegenerate one. It is shown that with decreasing of the wire radius at its certain value the << diamagnetic-paramagnetic>> size-transition occurs. Some estimations of electron gas susceptibility in GaAs wire are made. 15 refs

[en] We propose a construction for crystalline undulator (CU) which consists of plane, equidistant crystalline plates with the same curvature radius of alternating sings of certain crystallographic planes. It is shown that in a Si₁-xGe_x single crystal with constant gradient of Ge concentration x along the axis (111) the crystallographic planes (111) are curved. The ultrarelativistic particles in such CU can make periodic undulator oscillations with the amplitude exceeding the distance between the crystallographic planes. As a result, the particles produce intense undulator radiation besides the channeling radiation

[en] The spectral characteristics of thin semiconductor films with complicated dispersion law due to indirect interband transitions in a magnetic field are studied