Irradiation of Fe-Mn Supersaturated Solid Solution with Ions of Various Atomic Masses (Ar+, Xe+) and Analysis of the Role of Nanosized Dynamic Effects in the Activation Processes of Long-Range Type

A multiple increase in the atom mobility in metastable supersaturated (quenched from 850 °C) Fe-8.16 at % Mn solid solution is detected at temperatures less than 250°C under irradiation with 5-keV Ar+ and Xe+ ions of different masses. The irradiation-induced atom redistribution in the entire volume of foils 30 μm thick at a projected Ar+ and Xe+ ion ranges as much as 20-30 nm only is found and studied by the transmission Mössbauer spectroscopy. Long-range effects at low irradiation doses and anomalously low temperatures are attributed to "radiation shaking" of metastable media with post-cascade solitary waves in contrast to thermally stimulated radiation-enhanced processes in the narrow nanoscale near-surface layers of the alloy. It has been shown that heavier Xe+ ions at higher irradiation doses have a stronger impact on the solid solution than Ar+ ions

Investigation of the vacuum flashover discharge as a plasma source

The work was done under the theme of state task № 0389-2014-0005; partially this work was supported by the Russian Fundamental Research Foundation under Awards: 15-08-01648, 13-08-00619, 14-08-01137, 14-02-00575; Presidium RAS Program 12 and UB RAS Project 15-17-2-33

Improvement of the Method of Calculating a Group of Sound­insulating Panels

Original single-layer and multilayer structures of sound-insulating panels are considered, as well as their advantages compared to traditional analogs.The shortcomings of the method of optimization calculation of a group of sound-insulating panels designed to reduce noise in several production rooms are analyzed. This method has limited functionality due to a relatively small number of objective functions and the corresponding conditions for their use. Given this, an improved method of optimization calculation of a group of sound-insulating panels is proposed.The improvement of the method consists in increasing the number of objective functions intended for multipurpose optimization taking into account real production conditions. The refinement of the algorithm consists in the preliminary selection of a subgroup of panels with additional requirements for operating conditions (increased strength, fire safety, etc.). Under these conditions, the operator directionally distributes structures and materials among the selected panels.The statement of the optimization problem of group calculation with an extended list of objective functions and restrictions is given. Recommendations on selecting an objective function in specific production conditions are given.The regulatory requirements for noise reduction in production rooms and spectral characteristics of sound insulation of panels made of various materials are given. The spectral characteristics of noise in the room before and after application of the sound-insulating panel are also given.The effectiveness of the method is confirmed by the steady reduction of the mathematical expectation and variance of the total noise load on people in production premises with an increase in the number of iterations. The calculation method demonstrated the reduction of excess noise load in comparison with standard method