Change of the wear resistance of a superhigh-molecular-weight polyethylene plate upon its modification by a mechanically activated ceramic nanopowder

The object of investigation is superhigh-molecular-weght polyethylene (SMWP) with a molecular weight of up to 8 × 10⁶ g/mole and a particle size from 63 to 315 μm obtained by the technique developed at the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences. The purpose of this work is to create structural polymer materials with high physical and technical characteristics and to extend the scope of the application of this polymer in industry. The problem is solved by the modification of SMWP powder particles via the introduction of nanodispersed ceramic materials. Based on the data obtained, the methods of the production of the article samples from nanocomposite materials based on SMWP via the hot-pressing technique were developed and the influence of the nanomodifiers on the properties of the composite material was studied.     

Synthesis of Nanocrystalline Titanium Diboride in a Hypervelocity Plasma Jet

Results of experimental investigations of directly synthesizing nanocrystalline titanium diboride in a hypervelocity jet of electrodischarge plasma generated by a pulse high-current coaxial magnetoplasma accelerator with titanium electrodes are presented. The main result of the investigations is manufacturing a product with a mass of up to ～3 g containing more than 90% of titanium diboride obtained mostly in the form of hexagonal and dodecagonal particles.     

Stability of stochastic self-adjusting automatic control systems with after effect. I. mean square asymptotic stability of systems of linear stochastic differential-difference equations

The stability of stochastic self-adjusting automatic control systems with aftereffect is investigated. Theorems on the mean square stability of stochastic differential difference equations are proved, which allow the stability analysis of stochastic self-adjusting systems.     

Lithium incorporation into thin films of vanadium oxides

Thin-film electrodes based on vanadium oxides have been obtained using the thermal oxidation of vanadium films deposited in vacuum. It is established that these electrodes admit the reversible incorporation of lithium from aprotic electrolytes and possess an initial capacity exceeding 250 mA h/g. The electrodes have good prospects for use in thin-film lithium ion batteries.     

Self-Detection of High-Frequency Mechanical Oscillations of Whiskers in Quasi-1D Conductors with Charge-Density Wave

Heterodyne mixing with frequency modulation is employed for detection of torsional resonances of whiskers in rhombic TaS₃ (typical quasi-1D conductor) with charge-density wave (CDW). The dependences of both torque and the feedback signal of torsion on the internal properties of CDW are distinctive features of the proposed method. Sample placement in the vicinity of the electrode that serves as gate is unnecessary. Electromechanical and elastic properties of the CDW systems can be studied with the aid of the proposed method, at least, in the megahertz frequency range.     

Corrosion longevity of gas turbine blades protective coatings

Results obtained from long-term studies conducted at the NPO Central Boiler-Turbine Institute on determining corrosion longevity of gas turbine blade protective coatings applied using different methods are presented. It is found how the base and alloying elements of coatings, the ceramic layer thickness, and the corrosion resistance level of undercoat alloy influence the longevity of coatings.     

Nondestructive testing of steel rods

The possibility of the detection of hidden flaws in magnetization with a geomagnetic field was determined experimentally. Steel rods 3 mm in diameter and 2 m long, which were prepared from a wire that is used in shock absorber springs, were used as test objects.