Location of compensating devices is determined by various factors: configuration of power supply system, enterprise load schedule, type and length of power lines, parameters of capacitor banks, value of supply voltage. We consider the influence of the above factors on the creation of a mathematical model to determine the location of compensating devices, taking into account the minimum economic costs.

Keywords: compensating devices, reactive power compensation, power system, power grids of industrial enterprises, load schedule, mathematical model, reduced costs

This article proposes an experimental determination of the density of the interparticle fusion surface during sintering of hot-deformed powder materials. The study analyzes the physics of the processes of forming microstructures of splicing surfaces at various stages of producing powder materials. The peculiarities of deformation processes in the formation of materials by hot pressure treatment are considered and physical changes that undergo powder grains are investigated. The nature of the boundaries of the splicing surfaces on the investigated objects, as well as the process of pore healing during compaction of molds based on steel from two types of charge based on coarse and fine iron powder with different porosity are traced.

Keywords: physics of processes, quantitative characteristics, surface area of splicing, specific surface of splicing, hot-deformed powder blanks, structure formation, microstructures, surface deformation, pore healing, particle size

In this article, the study of the influence of the parameters of friction welding with mixing on the mechanical and microstructural properties of AA2195-T0 and T8 is considered. This article describes the results of an experimental study of the evolution of mechanical properties and microstructure of a friction-stirred welded joint of aluminum-lithium alloy 2195.

Keywords: friction welding with stirring; process parameters; mechanical properties; aluminum-lithium alloy

This article discusses strength testing of welded joints by pulling joint materials using an automated material testing system.

Keywords: YAG laser welding, packaging of photonic devices, laser processing of materials.

The article discusses the production and use of environmentally friendly fuel - pellets. A review of the designs of mobile pellet production plants was carried out, the advantages and disadvantages of these designs were identified. Potential consumers of pellets and equipment (heating boilers for which pellets are the fuel) are considered. A mobile complex for the production of pellets on the chassis of the MSN-10-004-03 . The technology of pellet production using a mobile mobile installation is described.

Keywords: pellets, mobile plant, design, biofuels, production technology

Pipeline networks today are the main and one of the safest ways to transport all kinds of media. This engineering system consists of various elements, one of which is pipeline fittings that regulate the parameters of working media and protect pipelines from overpressure. In order to control the operability of pipeline fittings, it must be subjected to comprehensive tests, one of which is a leak test. The presented study describes the developed design of a technological hydraulic installation intended for use as part of process equipment for conducting in-plant testing of pipeline valves. The results of modeling the stress-strain states of the main units, as well as the hydraulic calculation of the test circuit of the installation are presented.

Keywords: rotary check valve, pipeline fittings, pipeline system, mathematical modeling, finite element method, strength analysis, stress-strain state, computational fluid dynamics, hydraulic tests, technological hydraulic installation