An experimental assessment of the dependence of the normal flame velocity of methane-hydrogen fuel with air using the Gouy-Michelson method has been carried out. The concentration of hydrogen varied from 0% to 70% by volume.

Keywords: burning rate, normal flame propagation speed, flame front, methane-hydrogen fuel, Gouy-Michelson method

Hot stamping of porous billets (GSPZ) is considered. Structural steels obtained with the use of GSPZ technology are significantly inferior in terms of machinability by cutting similar in chemical composition to cast and hot-rolled steels. Various alloying elements are considered to improve the machinability of structural powder steels by cutting and their effect on physical and mechanical properties.

Keywords: powder metallurgy hot stamping of porous billets, GSPS, machinability, alloying elements

The local atomic and electronic structure of PANI / Cu nanocomposite was studied by X-ray absorption spectroscopy. It was found that as a result of the formation of a nanocomposite, the polymer chain is transformed by π electronic subsystem and changes local structure of copper. Polyaniline in composite is partially oxidized and protonated.

Keywords: polyaniline, polymer-inorganic composites, X-ray absorption spectroscopy, electronic structure, conductive polymers

This article is devoted to the problem of increasing efficiency of internal combustion engines, and decreasing the levels of potentially harmful chemicals and particulates in the engine exhaust. Internal combustion engines are widely used in automotive transport. Currently there are more than a billion of internal combustion engines in use. They consume substantial amounts of fuel and adversely affect the environment. This paper focuses on a novel approach to increasing the efficiency of internal combustion engines through the use of a turbine-based mechanism. This setup enables the engine to avoid friction losses caused by the currently used crank-and-connecting-rod setup. The turbine-based mechanism will be less prone to detonation of the fuel mixture, and will increase the compression ratio. It will also allow to add 3-8% of hydrogen to the fuel mixture, thus increasing the operating temperature and decreasing the concentration of potentially harmful chemicals and particulates in the engine exhaust. Besides increased efficiency, the proposed engine design will enable liquid-based cooling of the turbine blades. Traditional materials can be employed in its construction.

Keywords: automobile transport, internal combustion engine, increasung efficiency, decreasing the levels of potentially harmful chemicals

"One of the bottlenecks of the production of oxide-semiconductor capacitors is enough fast aging of impregnating solutions of manganese nitrate used to form the cathode electrode of manganese dioxide. This effect is caused by the formation and accumulation of impurities of oxides and nitrides of manganese in the solution, which leads to a poor-quality cathode coating of manganese dioxide on the tantalum anode and as a result, poor performance capacitors. Fast aging of impregnating solutions of the Mn(NO3)2 solutions leads not only to an increase in the cost of materials, but also significantly increases of the volume of waste. As a solution to this problem in the proposed article discusses aspects of chemical regeneration of contaminated solutions of manganese nitrate, analyzed the possible ways of its realization in relation to the existing production of oxide-semiconductor capacitors."

Keywords: Manganese nitrate, manganese oxides, cathode coating, impregnating solutions, manganese nitrides, manganese oxohydroxide, chemical regeneration.