The article is devoted to the results of studies of the initial modulus of elasticity of tuffs on natural porous aggregates of Kabardino-Balkaria, with compensated shrinkage with prepared additives, both in quartz and tuff sands. The article presents the results of experiments on determining the initial modulus of elasticity of tuffs of different preparation formulas. The values ​​of the correction coefficients in the well-known formula for the dependence of the initial modulus of elasticity of lightweight concrete on its cubic strength and the volume weight of dry concrete, depending on the formulation of tuffs are proposed.

Keywords: Modulus of elasticity, tuffs, light concretes, porous aggregates, tuff, tuff sands, compensated shrinkage

The article substantiates the necessity to address the effects of fog and rain when designing mobile robotic platforms and to define the fog numerical indicators and conditions of its occurrence. The common braking system structure and the working principle of brake disk drying through periodic rubbing of brake pads and disks are brought. The electrical diagram of brake control system with microcontroller and the fog and rain sensors and reliability analysis of this device are given. In a proposed control device operation algorithm the conditions of fog occurrence and the sensor parameters are considered. The algorithm is required to create a software system for mobile robotic platform.

Keywords: mobile robotic platform, fog, braking system, microcontroller, sensors, control system, software system

the paper presents the analysis of volumes of waste wood processing industries in the form of sawdust and considers modern directions of their use. It justifies the rationality of production of fibreboard by using a semifinished product obtained from sawdust. The mathematical description of the process of production of wood-fiber plates with the addition of a semifinished product obtained from sawdust as the total weight, thus establishing the quantitative relationship of studied process parameters physico-mechanical parameters of the finished plate.

Keywords: Zyryanov M.A., Aksenov N.V.

In modern conditions developed and used hydraulic calculation of gas networks program. With them, you can get the pressure value at the nodes of the distribution system of gas supply, costs, and gas velocity in the settlement areas. But do not count in these economic aspects, ie, It is not determined the most economical option, which can be obtained by optimizing the individual characteristics of the gas network. These characteristics in the development of the concept of gas supply is a rational distribution points gas reduction and determination of optimal kolichestva.Priveden calculation of the optimal number of the PWG and the optimal diameter of individual sections of the network of medium pressure gas pipelines to ensure the best economic performance timing system. Defined pressure regulator bandwidth capacity for its stable operation. To determine the effect an increase in the inlet pressure on the diameter of the pipeline.

Keywords: optimum range, the optimum load, optimization of pressure, the diameter of the gas-supply circuit, the hydraulic calculation capacity pressure regulator.

The article describes a partial solution to the problem of disposing of waste plastic as their use in the manufacture of fiberglass reinforcement. The comparison of the calculation of the foundation slab reinforcement using the class A-500S and fiberglass reinforcement with a thickness of 300 mm plate. From calculations that by recycling the plastic in the manufacture of fiberglass reinforcement observed economic benefits for the producer (cost of fiberglass reinforcement with the same thickness of the foundation plate 3 times less than steel), as well as environmental benefit for the planet, as this will help reduce the amount of plastic waste without recycling.

Keywords: plastic, recycling, waste fiberglass rebar, reinforced concrete structure, the foundation

Considered hot-powder materials obtained by the joint mechano-chemical activation of chips D16 ferrotitanium powder in a medium saturated aqueous solution of boric acid with the addition of aluminum powder. The technology includes: mechanochemical activation composition; cold pressing; heating in air, and hot stamping. Investigated the mechanical properties and structure of the obtained hot-materials. Advanced technology allows to obtain a material with high values of strength and hardness.

Keywords: mechanochemical activation, milling, chips D16, ferrotitanium, hot-powder materials, agglomeration

The article presents the results of approximating of ion current signal of the most appropriate parametrical models in Matlab software. It is shown that in spite of the high accuracy of approximation, parametrical model Gaussian, which chosen early in Matlab, have significant drawbacks. In order to eliminate the identified deficiencies authors was developed parametric model in which the discrete Fourier transform was used to approximate of the ion current signal.

Keywords: ion current, the internal combustion engine, a parametric model, a discrete Fourier transform, the Gaussian model, the approximation of a signal

The article presents an analysis of the causes of the defects affecting the bearing capacity of the bridge superstructures. Produced rough calculation of weight load time, which led to the defect data.

Keywords: " defect analysis, span, load, weight, diagram, method of elastic supports, checking flight, the estimated vehicle.d economic purposes of a diversification, technological purposes of ensuring flexibility of production"

It describes the importance of urban development in national security, which is caused by the development of the defense infrastructure districts.

Keywords: city garrison, armed forces, defense, defense infrastructure

In accordance with the theory of mathematical and statistical modeling, evaluation studies, selected the main characteristics of the models describing the studied production process of fiberboard using different types of binders. In accordance with the developed plan of the selected controlled studies, uncontrolled and controlled factors of the process under study. The levels, steps, and intervals of variation of the studied factors. As a method of obtaining the mathematical dependencies of the quality indicators of fibreboard from the kind of used binder was enacted active single-factor experiment. The results of the studies conducted statistical analysis of the dependence of physical-mechanical characteristics of the performance of the finished plate thickness fibreboard manufactured by wet and dry methods, interpretation of research results, quantitative and qualitative relationships between the studied parameters.

Keywords: strength, water absorption resin, fiberboard, thickness, experiment planning, mathematical model

The powder samples of indoniobat lead relaxor ferroelectric prepared by intense mechanical action method in combination with shear have been studied. The dependences of the microstrains and mean square displacements оf the PbIn0.5Nb0.5O3 samples from the values of applied pressure have been investigated. The Integral intensities and half-width of some diffraction reflections have been determined by using X-ray diffraction method. The correlations between mechanical action and concentration and type of defects in the studied samples have been established.

Keywords: relaxor ferroelectric, point defects, dislocation, region of coherent scattering, crystallite, microstrain, mechanoactivation, indoniobat lead, shear, power affecting, X-ray diffraction

The results of researching the speed of increasing strength of modified concrete materials in early period of hardening used for mounting underground structures are given. As a result of researching the most effective supplements like D5 and RELAMIX T-2 are determined. The composition of supplement D5 with fillers of ordinary quality and a con drafting 15 sm, it will gain high strength of 6.5 MРa in 18 hours while with RELAMIX T-2 fillers it will be 2.8 MРa. The given results were used for modeling stress strained state of ground mass and concrete fastenings of non- circular shape.

Keywords: Рassage, fastening, composition of concrete, modifier, concrete strength, young modulus, stresses

Low heat transfer coefficient per unit area is main disadvantage of immersion cooling system. In the theoretical part of the study the main issue was to evaluate the influence of various factors on the convective heat transfer between the solid-liquid interface. The result of this part of study was conclusion that the type of fluid flow in the area of heat transfer is key factor of increase heat convective heat transfer of thermal contact. The Reynolds number is main characteristic of turbulence of fluid flow. Therefore in the experimental part describes study of the effect of the degree of turbulence of the fluid flow at the place of the thermal contact on thermal resistance of immersion cooling system. The design of experimental setup and its main parts is describe further. The result of the experiment is graphic of experimental curve of the thermal resistance of immersion cooling system from the Reynolds number of fluid flow of thermal contact between the solid-liquid interface. The study showed the possibility of local reduction of the thermal resistance of immersion cooling systems to maintain the quality of the thermal management of computing elements that emit significant heat. The results of the study is define the ranges of values of the Reynolds number of cooling system that allows the technical realization at the current dimensions of packages and sizes of microchips sockets.

Keywords: microchip, heat flow, cooling system, Laplace's equation, turbulent flow, Reynolds number, heat transfer, thermal resistance, electrothermal analogy, thermal protection

This paper provides solution for the task of plane movement of the underwater vehicle using hierarchical control system. Searching A*-algorithm is used for creation of the path plan. Vehicle moves along the stated path under control of position-path regulator on the base of square form. Vehicle, used in this paper features torpedo-like form, two cruise engines and maneuvering device.

Keywords: mathematical model, underwater vehicle, planning, position-path control, A*-algorithm

The article presents the results of an analytical review of the major conventional approaches to processing and analysis of the ion current signal of contemporary domestic and foreign authors. Analysis of works made in terms of assessing the possibility of calculating the parameters of the combustion of the fuel-air mixture. It is shown that strong susceptibility of ion current to influence of intercyclic variations limits application of methods in practice, despite considerable theoretical opportunities of such methods.

Keywords: ion current, internal combustion engine, burning, combustion chamber, fuel and air mixture