[en] Titanium- and erbium-containing optothermal fibre converters of laser radiation mounted at the distal end of quartz – quartz optical fibre are discussed for the first time. Technology of fabricating such converters is described. Carbon-containing converters are also considered. The laser heating dynamics of the converters and the glow spectra are studied by irradiating converters of each type by a 980 ± 10 nm semiconductor laser with an average power up to 4 W. It is shown that alongside with broadband thermal radiation accompanying the laser heating of all three types of converters in the temperature range 600 – 1100 °C, only in the spectrum of the erbium-containing converter the intense bands with the maxima at wavelengths 493, 523, 544, 660, and 798 nm, corresponding to the erbium radiative transitions ⁴F_7/2 → ⁴I_15/2, ²H_11/2 → ⁴I_15/2, ⁴S_3/2 → ⁴I_15/2, ⁴F_9/2 → ⁴I_15/2 and ⁴I_9/2 → ⁴I_15/2, respectively, are present. Such converters can be used in laser medicine for tissue surgery as well as in procedures combining laser, thermal, biostimulation or photodynamic action.

[en] The parameters of energy losses [S] of ³He⁺ and ⁴He⁺ particles backscattered on Nb and Sn are obtained. It is shown that on the basis of the obtained values of [S] it is possible to analyse the composition of Nb+Sn films Up to their thickness approximately 1.3 μm

[en] Investigation results of interconnection between microstructure and superconducting characteristics of Nb-Ti-thin films with Ti content from 30 to 66 at. % are presented. For all the films investigated the mean grain size of 100-250 nm is characteristic. The density of the defects observed (the grain boundaries, deposition, dislocations) depends greatly on the sample composition. The structure of the films, deposited upon the copper sublayer, differ from the structure of films deposited upon silicon mainly by greater dislocation density (approximately by an order). In films with Ti content higher than 60 at. % separations of the α-Ti phase are observed (with the size of approximately 100 nm), which are in some triple points of the structure (in the junction of three boundaries of grains). Conclusion is made on the effect of the structure defects upon the pinning force

[en] The experimental setup designed to study the steady state and transient heat transfer under forced helium flow conditions is presented. The flow circulation was maintained with the use of a 300 W helium refrigerator. The paper reports some details of preparative technology of the thin film heater-thermometers, the constructional features of the hirizontal flow cryostats with annular channels, and the principle circuit of the electronic system. Some experimental results are given as examples. 13 refs.; 9 figs

[en] Estimates are obtained of actual values of the superconductor rf parameters (surface resistance, penetration depth, and threshold amplitude of rf field) for the case of moderately strong pinning of vortices at frequencies of order 10⁹ Hz and in a magnetic field Bapprox.1 T. Nb--Ti specimens with characteristic (''pinning'') frequency f_p on the order of several GHz are obtained and investigated for the first time. The value f_proughly-equal3.5 x 10⁹ GHz obtained from the static measurements agrees satisfactorily with the measured rf parameters of these specimens

[en] Uranium-238 films on substrates of various materials for targets in nuclear experiments have been produced. A strong influence of vacuum conditions over metal-physical properties of producing films has been defined. At vacuum 2.10^-5 Tor the films on the basis of non-stoichiometric phase UO₂ have been obtained. Vacuum improvement up 3.10^-6 Tor promotes to forming the films crystallizing into α-U phase with a small content of UO₂ phase. Heavy element presence in uranium films has not been observed

[en] Uranium films on the substrates of various materials for the targets in nuclear experiments have been produced. A strong influence of vacuum conditions over metal-physical properties of the producing films has been defined. At vacuum 2.10^-5 Torr., the films on the base of non-stoichiometric phase UO₂ have been obtained. Vacuum improvement up to 3.10^-6 Torr. promotes to forming the films crystallizing into α-U phase with a small content of UO₂ phase. Heavy element presence in uranium films has not been observed. (orig.)

[en] The results of experimental investigation of the pinning force in Nb-Ti films are presented. It is shown that the pinning of the vortices is caused either by the grain boundaries or by dislocations in the bulk of samples depending on the composition of the films (niobium-base solid solutions)

[en] The apparatus structure and the composition of a new version of the X-ray diffractometer DRON-2 are presented. Control and measuring apparatus was realized in CAMAC standard. The apparatus volume is one CAMAC crate. New version is made of the X-ray shield. The program packet consists of the first display programs, control, treatment and information exit. (author)

[en] The profile of the stationary field penetrating into the superconducting niobium films was measured by specular reflection of thermal polarized neutrons. The measurements are done on the polarized neutron spectrometer SPN at the pulsed reactor IBR-2 in Dubna. 7 refs.; 1 fig