In this study, plasma discharge in liquids the intense ultrasonic field above cavitation threshold has been proven to be of great interest for initiation various physical and chemical processes. The feature arc liquid media is localization region near electrodes "falling" form volt-ampere characteristics. cavitation, fraction gas-vapor component exists, therefore it can assumed that electric breakdown should become easier, which result forms discharges.

This article considers a nonlinear system of partial differential equations describing the boundary layer. Such is commonly solved by numerical methods. Here, Dorodnitsyn–Lees variables were used to carry out an analysis and derive formulas for calculating body temperatures heat fluxes generated reacting compressible gradient

The questions and the particularity of choice design parameters multi-module lunar jet penetrators are considered. A constructive layout penetrator is proposed advantages a multi-modular presented. In particular, limitation on depth penetration reactive standard scheme, associated with characteristics flow combustion products from nozzle into variable length channel left after passage apparatus, described. An algorithm suggested for solving problem penetrators, which based same methods...

The possibility of using penetrators for researching the subsurface layers moon is considered. Possible options launching such are indicated, from way launch carried out depends on depth penetration into regolith. It was found that when propulsion system has less traction than static resistance lunar soil, movement does not occur if penetrator accomplished surface with zero entry speed. dependences given permit calculating sufficient accuracy mass, and resulting overloads. inertial its...

The article presents the results of a study electromagnetic effects from space rocket activity using example Plesetsk cosmodrome and aviation complex Ostafyevo Airport. influence pollution on environment is considered; authors analyze fields human health taking into account thermal effects. It was demonstrated that long-term effect sources with different wavelengths at moderate intensity causes changes in irritability visual, olfactory vestibular analyzers, as well development functional...

The purpose of the article is to analytically solve conjugate problem heat transfer in a viscous shock layer on blunt object and thermal conductivity an anisotropic half-space. A feature flow around such bodies near critical point that this case, boundary equations are not satisfied it necessary Navier-Stokes together with continuity, state, energy, however, stationary formulation incompressible flow. coupled between gasdynamic half-space assumption incompressibility behind normal part wave...

This article discusses the study of background radiation level in Moscow and its impact on environment. To identify radiological living conditions, a effects fast neutrons infrastructure biological objects was made. Large-scale research organizations carrying out technological development, scientific materials using nuclear city region are considered. A system environment monitoring, covering an area more than 1091 km², examined detail. radioecological survey conducted Troitsky Novomoskovsky...

Nowadays, numerous researches are being performed to formulate nontoxic multifunctional magnetic materials possessing both high colloidal stability and magnetization, but there is a demand in the prediction of chemical water solutions. Herein, series silica-coated magnetite nanoparticles (MNPs) has been synthesized via sol-gel method with without establishing an inert atmosphere, then it was tested terms humic acids (HA) loading applied as coating agent. The influence ambient conditions on...

Hydrazine and its derivatives belong to the class of highly toxic compounds that cause acute chronic forms intoxication with a predominant lesion liver, blood system, as well other human organs. At same time, these products are absorbed by ashen-gray gray forest soils under cation-exchange mechanism; however, hydrazine fuels their in moderate doses not microorganisms plants, they can use carbon nitrogen contained them sources nutrition; herewith, high content transformation aerospace fuel is...

Additive manufacturing technologies make it possible to manufacture any product in layers based on a 3D computer model, but this issue is understudied. Therefore, paper considers the problem of describing effects buckling arising three-dimensional printing products containing elements whose length significantly exceeds their thickness or characteristic size cross section. The behavior these elements, from point view material mechanics, can be described using models plates beams. In study, we...

Carbon-carbon composite materials are characterized by high heat resistance and thermostability for which they, in most of their physical mechanical characteristics, can be attributed to the promising materials. Approximately 81% all carbon-carbon used manufacture brake rotors aircraft, 18% – space rocket technology, only 1% other areas application. While need composites technology is constantly decreasing volume production disc aircraft steadily growing, therefore research on properties...

This work investigates the effect of carbon nanomodification on residual stress-strain state (SSS) after molding. One ways to reduce stresses and deformities is nanomodification. The main objective was determine degree influence parameters SSS. Within framework this study, 4 slabs were made. Two are made a conventional binder with laying [010/9010] [010/4510] two modified binding material same layer structure. For fabricated plates, deflections measured each four sides, during which strains...

The relevance of the problem stated in this article is that development aerospace technology increased demand for good quality materials. An important issue ensuring durability conditions longterm loads and damage development. One criteria ensure toughness material crack resistance. aim work to study interlayer resistance (fracture toughness) under loading separation transverse shear, strength, as well effect temperature on mechanical tensile properties. A comparison values GIС (separation)...

Objects of modern technology located in the rain zone experience additional loads and can be destroyed due to water droplet erosion. With a significant number successive impacts certain period time, causes damage surface materials or structures. It should noted that supersonic impact has low probability occurrence; however, peak pressure impulse hammer (up GPa level) far exceeds strength many materials, small are enough material structure. Therefore, it is very interesting determine external...

The article discusses the thermal protection of spacecraft under various types and climatic influences. During pre-launch preparation, several icing are possible on surface tiled structure, consisting quartz heat-shielding tiles. It is very important in process operation, to determine normal shear stresses during impact ice formed tile gaps. necessary calculate strength performance active stages flight spacecraft. A mathematical model was constructed that allows, with a sufficient degree...

In this work, it has been shown that during the irradiation of glass by one moving laser beam, an initiation crack can take place before and behind spot. The a spot (within frontal zone) is implemented at higher power radiation (or lower speed movement spot) than rear zone). If initiated within zone, unstable. pattern depends on random factors such as residual stresses defects. When steady because region near tip surrounded compressive obstructing its traverse propagation.

The main purpose of this paper is to evaluate the structural response composite steel-concrete eccentrically buckling-restrained braced frames (BRBFs). finite element (FE) software ABAQUS employed nonlinearly analyse BRBFs. Comparing modelling and experimental test results validates FE method BRBF. Three different strong earthquake records Tabas, Northridge, Chi-Chi are selected for nonlinear dynamic analyses. A BRBF then designed having a shear link. Afterwards, analysed under using...

The results of a study on the development and testing heat-resistant coating in Si-TiSi2-MoSi2-TiB2-CaSi2 system to protect Cf/C-SiC composites from oxidation erosional entrainment high-speed flows are presented here. was formed using firing fusion technology powder composition. Oxidation resistance tests were carried out under static conditions air at 1650 °C interaction with plasma flows, Mach numbers M = 5.5-6.0 enthalpy 40-50 MJ/kg. effectiveness protective action confirmed surface...

Presently, three-dimensional printing technology is developing rapidly. This happens due to the need create products of complex shape, production which by existing standard methods very difficult and disadvantageous, sometimes technically impossible. The study aims investigate problem temperature stability a thin-walled cylindrical structure under unsteady local thermal exposure, simulating motion laser beam spot along one ends. To solve problem, finite element method was used. Since...

When solving the problems of coupled heat transfer between viscous flows and streamlined bodies under conditions aerodynamic heating aircraft, it is necessary to overcome significant difficulties. They associated primarily with determining boundary conditions. The paper investigates joint (coupled) a gas dynamic layer an anisotropic strip based on obtained analytical solution second initial value problem thermal conductivity in arbitrary Since system equations gasdynamic essentially...