[en] Bridge- and point-type junctions made of yttrium (YBaCuO) or bismuth (BiPbSnCaCuO) ceramic bars of 2 x 2 mm² or 2 x 1 mm² cross section are investigated. It is shown that a two-parametric family of stable states is harnessed in the junction, each state having its own specific R value

[en] An attempt was made to investigate into concentration and temperature of a beam-plasma system by the laser scattering method. Relativistic electron beam generated by pulse high-current accelerator possessed the following parameters: approximately 1.5 MeV electron energy, approximately 25 kA beam current for approximately 6 sm diameter, approximately 60 ns duration of current pulse. Electron beam was injected into interaction chamber of 130 cm length and 12.8 cm in diameter, filled with neutral gas (Ar or 86% N₂+14% SF₆ mixtures). Electron beam was transported in external magnetic field of up to 5 Oe strength. Increase of plasma density up to 5x10¹⁶ cm^-3 at Tsub(e) approximately 1 eV at p > or approximately 3 torr pressures was revealed, which testifies to the presence of collective processes in plasma

[en] A method has been proposed for determining the ion component of plasma by fluctuations of the scattered radiation intensity, which makes it possible, applying together with the traditional method of scattering, to measure electron and ion temperatures and density at any values of the Salpeter parameters. The scattering cross section is calculated. A very simple and reliable technique for measurements has been developed. The results of measurements of plasma parameters of an argon plasmatron jet are presented. The results have been compared with the data obtained by other methods. The range of applicability of the method is indicated

No abstract available

No abstract available

[en] The synthesizer of the low-frequency alternating current on the Josephson effect basis is described. The 8-bit Josephson integral microscheme (with the superconductor-insulator-normal metal-insulator-superconductor transitions) with the working frequency of the SHF electrical pumping of 10 GHz is described. Special program software is developed for the synthesizer control. The preliminary results on the low-frequency sinusoidal electric signals are presented in form of tables

[en] The method for studying the dynamics of the strong-shunted Josephson transition, shifted by the experimental periodic current with controlled parameters, is developed. The analytical expressions for the transition processes damping rate and energy consumption, necessary for the Josephson transition switch-over from one quantum state to another one, are obtained. The results for the case of the transition shift by the short (single- and bipolar) pulses in the form of the δ-function are presented in the form of the exact analytical expressions

[en] The rectangular pulse generator on the basis of the Josephson effect is described. The microcircuit with the series of 512 consecutively connected nonhysteresis Josephson transitions pumped in through the SHF- radiation with the frequency of 10 GHz was applied. The quantization pitch and maximum amplitude were determined by the applied microcircuit and pumping frequency and were equal to 0.04 mV and 10 mV correspondingly. The switch-over time constituted ≤ 600 ns by the current control and ≤ 50 ns by the SHF-capacity modulation

[en] The analytical method for studying the electrodynamic properties of the Josephson transitions, irradiated by the pulse series in form of the Dirac δ-function is developed. The actuality of these studies is related to the possibility of creating the digital-analogous transformers and signal synthesizers of the assigned form with fundamental accuracy on the basis of the Josephson effect. The analytical expressions, determining the conditions of the phase capture, the average voltage on the transition and the Shapiro steps boundaries are obtained. The results are presented in the graphical form for the cases of the unipolar and bipolar pumping of the transition. The discussion of the obtained results and their comparison with the earlier known ones are carried out

[en] Laser light scattering is used to study the density and temperature of a plasma produced in a neutral gas by an electron beam. An increase in the plasma density to 5 x 10¹⁶ cm^-3 with T/sub e/approx.1 eV was observed at pressures p> or approx. =3 torr, which indicates that collective processes occur in the plasma