"Technical Physics Letters"

Prokof’ev, A. V.;Pleshakov, I. V.;Shlyagin, M.;Agruzov, P. M.;Bibik, E. E.;Kuz’min, Yu. I.

doi: 10.1134/S1063785019080121pmid: N/A

Abstract The noise generated by different ferrofluid samples when probed by the fiber-optic method has been investigated. It is shown that switching on a magnetic field significantly increases the noise, which is presumably related to fluctuations accompanying the process of aggregate formation. The dependences of the rms noise on the field strength and probe-light intensity have been experimentally determined. A slow decrease in the rms noise after switching off the magnetic field has been found, which indicates relaxation of the aggregates formed by the field.

Shibkov, A. A.;Gasanov, M. F.;Koltsov, R. Yu.;Denisov, A. A.

doi: 10.1134/S1063785019080133pmid: N/A

Abstract The effect of local corrosion on the dynamics of macrolocalized deformation bands and the destruction of the aluminum–magnesium alloy AlMg6 has been studied by high-speed video shooting of the surface of a deformable sample. It has been established that a corrosion spot caused by a local effect of sodium hydroxide on the surface of the alloy is an attractor of deformation bands, the interaction of which leads to premature failure and reduction of the ductility of the alloy.

Bobylev, A. V.;Kharlamov, S. M.;Guzanov, V. V.;Kvon, A. Z.;Markovich, D. M.

doi: 10.1134/S1063785019080078pmid: N/A

Abstract The results of an experimental study of the waves on the surface of a vertically falling liquid film in the range of the Reynolds numbers of film flow 80 < Re < 420 have been presented. The experiments have been carried out with the use of the field optical diagnostic methods with high spatial and time resolution. Generation of capillary ripples with a small wavelength has been detected at the crests of large three-dimensional waves. It is in these areas of three-dimensional waves where so-called “turbulence spots,” the occurrence of which is associated with a transition to a turbulent flow mode, are observed, as noted in the literature. Long-lived rounded depressions with characteristic transverse dimensions of 1–3 mm, which are formed in the region of the interaction of capillary precursors and then propagate as independent structural elements of the flow, have also been recorded.

Dubinov, A. E.;Tarakanov, V. P.

doi: 10.1134/S106378501908008Xpmid: N/A

Abstract A PIC code was used to simulate the formation of a chain of several virtual cathodes in a conical drift tube with its diameter increasing in the direction of motion of the electron beam. Their spatiotemporal dynamics was calculated.

Malushin, D. S.

doi: 10.1134/S106378501908011Xpmid: N/A

Abstract A multiparameter technique for pulsed eddy current testing is proposed, which allows one to conduct separate quantitative determination of more than seven parameters of multilayer structures containing magnetic components. The use of the proposed technique for quality control of conducting magnetic coatings and laminated composite materials used in the aerospace industry is demonstrated.

Malin, T. V.;Milakhin, D. S.;Aleksandrov, I. A.;Zemlyakov, V. E.;Egorkin, V. I.;Zaitsev, A. A.;Protasov, D. Yu.;Kozhukhov, A. S.;Ber, B. Ya.;Kazantsev, D. Yu.;Mansurov, V. G.;Zhuravlev, K. S.

doi: 10.1134/S1063785019080108

Arkhipov, V. A.;Konovalenko, A. I.;Kuznetsov, V. T.;Zhukov, A. S.

doi: 10.1134/S1063785019080042pmid: N/A

Abstract In this Letter, we propose a method for quantitative assessment of the explosion and fire hazards of lithium–thionyl chloride elements, describe an experimental setup, and present the results of experiments with lithium–thionyl chloride elements of D and DD sizes.

Vlasov, A. A.;Aleinik, A. S.;Ashirov, A. N.;Plotnikov, M. Yu.;Varlamov, A. V.

doi: 10.1134/S1063785019080157pmid: N/A

Abstract Theoretical calculations and an experimental study of the degree of decrease in the acoustic sensitivity of an optical fiber in the frequency range of 20–20 000 Hz inside the cables of special design were carried out. A substantial decrease in acoustic sensitivity has been achieved, that is, more than –29 dB with respect to the standard single-mode SMF-28 fiber in a polymer shell. This result can significantly increase the threshold sensitivity of measuring systems based on fiber optic interferometers.

Akhmedov, A. K.;Abduev, A. Kh.;Asvarov, A. Sh.;Muslimov, A. E.;Kanevsky, V. M.

doi: 10.1134/S1063785019080030pmid: N/A

Abstract The results of studying the electric-spark plasma sintering of samarium monosulfide ceramics are presented. The dependence of the microstructure and phase composition of ceramics on the temperature of spark plasma sintering is studied on the basis of the data of scanning electron microscopy, energy dispersion X-ray microanalysis, and powder X-ray diffraction of synthesized samples. It is shown that a dense, nonporous ceramics, the phase composition of which is close to the composition of the initial powder, is formed at a sintering temperature of 1200°C.

Kamanina, N. V.;Likhomanova, S. V.;Zagidullina, Yu. R.

doi: 10.1134/S1063785019080091pmid: N/A

Abstract The results of a study of the modification of the properties of optical inorganic materials (optical ceramics CO1 (MgF2) and CO2 (ZnS)) are presented. It is found that the main characteristics of the studied materials with a surface modified by carbon nanotubes significantly changes when the laser-oriented deposition method is applied. Main features of the carbon nanotubes caused by its developed surface, the strength of C–C bonds, and low value of refraction index are taken into consideration. Analytical, quantum-chemical and experimental results of studies of changes in the spectral and mechanical parameters, as well as the wetting angle of the selected model inorganic matrices, are given.