V.F. Korolev

The problems of the stimulated electromagnetic radiation of a system of rotating anharmonic oscillators in a resonator is solved. The calculation is carried out using nonlinear dispersion theory. Taking into account the coupling between the complex permittivity and the resonator parameters the amplitude of the steady-state oscillations of the field in the resonator and the power emitted by the system is obtained.

A.R. Khokhlov

By analyzing the experimental data obtained by other researchers it is shown that the anomalous molecular-weight dependence of the partial specific volume of macromolecules in dilute solutions cannot be explained using the hypothesis of the "free volume" formed between colliding monomers. Another explanation is proposed in which this anomalous dependence is due to a reduction in the number of bends in the chain when there is an increase in the volume repulsion in the coil. This explanation is in better agreement with the experimental facts.

Z.V. Grin'ко and A.A. Predvoditelev

We investigate the tensile strength of filiform crystals of ammoniumand potassium dihydrogen phosphate (ADP and KDP) at room temperature and liquid nitrogen temperature as a function of their diameter for the two directions of growth <100> and <011>. It is observed that the filiform crystals, in contrast to macrocrystals of ADP and KDP, not only fail to break up during the low-temperature phase transition, but actually become stronger as the temperature is further decreased. It is shown that the observed strength of the filiform ADP and KDP crystals reaches 20-30% of the theoretical tensile strength.

L.A. Sarkisyan, E.Yu. Kir'yanov, and Yu.A. Vorob'ev

The results of work on the modernization of a 120-centimeter cyclotron, which enables the energy of the ions to be increased smoothly, and enables the range of accelerated ions to be extended are presented.

V.S. Kolesnikov, О.V. Kulik, and Yu.A. Pirogov

The possibility of practically complete absorption of the wave energy in semiconductor plates of arbitrary conductivity and thickness is considered. The conditions for which complete matching with a waveguide line occurs are obtained theoretically and confirmed experimentally.

G.A. Sardanashvi1i

A class of completely unconnected topological spaces for formalizing the representation of discrete space-time is proposed.

N.Ya. Rukhlyada, A.G. Trefilov and В.В. Shishkin

Emission images of the (0001) plane of monocrystalline hafnium were observed in the temperature interval l800-2100°K in an electron emission microscope in a 5x10^(-8) mm*Hg vacuum. The transition from the α-phase to the β-phase is preceded by a stable intermediate state of the crystal at T = 2020 ± 5 K. The transition αHf→βHf at T= 2050 ± 5К occurs after a time interval of Δt ~ 2 min. The effective work functions of hafnium were measured in the α-phase as (ϕ(α)= 4,1 ± 0,05 V) and in the β-phase as (ϕ(β)= 3,9±0,5 V).

V.N. Mileev and A. Smida (Algeria)

The application of the diffraction theory of multiple collisions to the scattering of nuclei at high energies is discussed. Using this theory an approximate method is formulated for calculating the scattering cross sections of nuclei in which part of the virtual excitations of the colliding nuclei is taken into account. Unlike the well-known approximation of "rigid" nuclei the proposed approximation is symmetrical with respect to both nuclei participating in the reaction. Numerical calculations of the total cross sections and differential cross sections of elastic scattering showed considerable difference between the results of the "symmetrical" approximation and those obtained by the unsymmetrical approximations of "rigid" nuclei and the Czyz-Maximon approximation, which do not completely take into account the virtual excitations.

M.G. Khaplanov

V.M. Chepurova