In this article, we investigate the effectiveness of using multiple pipes for heat dissipation. The study assumes laminar flow under steady-state conditions. Various mixtures are numerically investigated at different flow rates. Various nanofluids flowing through multiple parallel pipes have been numerically investigated to study the effects of temperature rise. Thanks to the benefits they bring to the cooling process, nanofluids have opened up a new way to improve the performance of thermal systems. A typical nanofluid consists of a base fluid, which is usually water, and nanoparticles.

Keywords: heat exchanger, flow tube, nanofluid, bottom heating, coefficient of friction, pressure drop

The article studies the dependence of the temperature of a heat-loaded element of microelectronics on the parameters of the shape of the heat-removing body. Numerical modeling of the study of the efficiency of the heat-removing surface in terms of reducing the source temperature was carried out in the Ansys Fluent CAD system. The advantage of the heat sink design described in the work is considered to be a fairly high intensity of heat removal from the thermally active region and a small weight, which is provided by the simplicity of the heat sink system and the increased heat transfer rate, which makes it economically advantageous to calculate the use of material and time costs for the manufacture of the product. The increased temperature of electronic equipment elements significantly affects the reliability of their operation. In this paper, the task is to ensure the normal temperature regime of the housing of a heat-loaded microelectronics element using a passive cooling system of a specially designed shape.

Keywords: heat sink, efficiency of the heat-removing structure, thermal resistance, temperature regime, heat transfer, thermal resistance, heat dissipation, heat-loaded element

The article considers the improvement of the centralized heat supply system (SCT) from Saransk CHP-2 by optimizing the calculated quantitative and qualitative parameters of the hydraulic regime due to circuit solutions (optimization of the thermal circuits of the CTP and etc.), including the distribution of thermal loads; the use of devices (installations) providing the expansion of the temperature schedule of heat supply to the network. This event will allow: to create the technical possibility of technological connection of a promising thermal load; to reduce specific fuel consumption by increasing the share of combined power generation at Saransk TPP-2; will ensure an increase in the utilization rate of the installed thermal capacity of Saransk TPP-2 to 45-50%.

Keywords: temperature chart; hydraulic mode; combined production; central heating point

The work is devoted to the application of modern information technologies in the socio-economic systems of control of forces and means of operational rescue units. Using the Google Earth interface with integrated data from the Mapinfo program, it is possible to track and coordinate the forces and means of rescue units to the scene in real time.

Keywords: information technology, Google Earth, MapInfo, visualization, fire development, forces and means, operational rescue units, interface, socio-economic system

The article discusses the improvement of overhead power line supports (OHPL) by optimizing them and automating the design, including the creation of a OHPL design model as a single system and an algorithm for solving it. Performed the stress-strain state analysis and the optimization of structural forms of support poles, taking into account the requirements of efficiency and manufacturability. Created a system of automated one-stage design of overhead transmission line supports.

Keywords: overhead power line, optimal design, lattice support, design model

The development of a methodology for the formation of an estimate of a construction object on the basis of its information model is considered, taking into account the state of development of software systems for BIM modeling and the peculiarities of regulatory regulation of the construction of construction projects in Russia. The factors that limit the possibility of drawing up estimate documentation for the information model have been identified. Taking into account the identified limitations, a set of operations necessary for the formation of an estimate for a construction object based on its information model is presented.

Keywords: BIM, 5D BIM-model, estimate documentation, civil and industrial construction

The design of internal combustion engine (ICE) control system for an unmanned aerial vehicle (UAV), providing reduced fuel consumption and stable operation of ICE at an altitude above 5000 m above sea level, has been created. A system of remote adjustment of the internal combustion engine parameters in real time during the flight of the UAV was developed and manufactured.

Keywords: unmanned, aircraft, control system, internal combustion engine, remote adjustment, radio channel

The construction industry is considered to be one of the most unsafe industries, and as a result, safety in the construction industry is considered a very important factor. To reduce the number of accidents and monitor workers at a construction site, the article suggests integrating new tracking and communication technologies. The authors analyze the existing similar technological solutions, identify their advantages and disadvantages. A method for organizing monitoring of workers at a construction site using mobile devices is proposed, as well as the architecture of a software and hardware complex. The developed method is a smart system for a mobile device. This solution allows you to monitor the location of workers using a GPS tracker and a built-in accelerometer, and, if necessary, notify them of a possible danger.

Keywords: construction site, accidents, safety in construction, employee monitoring, mobile application, geolocation

The paper presents the results of a study of the possible fight against snow drifts in the Murmansk region on the example of an auto-approach to the village of Teriberka. The volume of snowfall is calculated, recommendations are given on climatic data for the region, recommendations are given on possible options for dealing with snow in the Far North regions.

Keywords: snow drift, snow transport, road climatology, motor road, protection against snow drifts, drifting road sections, permanent and temporary snow protection

The choice of a method for transporting hydrocarbons from the shelf of the northern seas is an urgent task, necessary for the economic justification of a project for the development of an offshore field. A comparative analysis of existing transportation schemes allows us to take into account both the advantages and disadvantages of possible options, namely, the natural and climatic features of the region, the technical capabilities of contractor organizations, the cost of field development facilities and vehicle rental.

Keywords: hydrocarbons, continental shelf, transport scheme, analysis, tanker, gas and oil pipeline, onshore infrastructure, offshore infrastructure

The results of a theoretical and experimental study of the synthesis of GaInAsBi thin-film structures formed on InAs substrates in the field of a temperature gradient are discussed. The features of interfacial interaction in the In-As-Sb system in the presence of isovalent solvents (In, Bi) have been studied. The values ​​of the interaction parameters and the distribution coefficients of the system components are determined. Optimal technological modes for obtaining InAs-based heterostructures are presented. The properties of the surface of epitaxial layers are studied experimentally. It was found that the main control parameters are the temperature of thermomigration and its gradient. It is shown that the synthesized semiconductor materials can be effectively used in electronic devices of a new generation - electro-optical modulators and supersensitive sensor elements.

Keywords: epitaxial structure, crystallization, recrystallization, melt, segregation coefficient, organometallic compound, voltage sensitivity, near infrared range, solid solution, optical characteristic

The physicochemical properties of cobalt catalysts on a NaX zeolite support have been studied. The parameters of the specific surface area, reduction of deposited cobalt, and structural properties of the active component of catalytic systems have been determined. To establish these properties, the methods of BET, TPR, TPD-H2, IR spectroscopy were used. It is shown that the preparation procedure has a significant effect on the physicochemical characteristics of the samples.

Keywords: catalysts, cobalt, zeolite, dispersion, specific surface area of the active component

This article discusses the approach being developed, the option of life cycle formation using the example of underground structure. The most recent life cycle model used in foreign countries is considered. And based on this model, the developed scheme of the life cycle model of the underground structure is presented.

Keywords: Life cycle, BIM, TIM, underground facilities, modeling, information construction, redevelopment, monitoring, GIS

The results of the development of compositions of fibroconcrete floor coverings and the technology of their preparation for use in structures during the construction of industrial and civil structures are presented. The effectiveness of the use of polymer and basalt fiber fibers, as well as plasticizing additives in the manufacture of fine-grained fiber concrete is substantiated. As a result of the conducted experiments, the composition of fine-grained fiber concrete with the use of basalt fibers as fillers is proposed. Based on the calculation of the estimated cost, it was found that the use of fiber fibers in the concrete mixture instead of laying metal mesh allowed to reduce labor costs by about 2 times, reduce the amount of binder, and also improve the performance characteristics of floor coverings by increasing crack resistance and corrosion resistance.

Keywords: floor coverings, fiber-concrete mixture, superplasticizer, basalt fiber, strength

The purpose of the article is to study the material on the topic "Basalt fiber", to generalize the studied material and the accumulated experience on the given topic. The article discusses the advantages, disadvantages, problems of use and achievements in the study of basalt fiber used for the production of building materials as a reinforcing component. The analysis of the average cost of basalt fiber in comparison with other types of fiber is carried out, a conclusion is made about the advantage of using basalt fiber. General conclusions have been made about the advisability of using basalt fiber for the production of building materials, and unexplored areas of using this type of fiber have been identified.

Keywords: basalt fiber, reinforcement, stress-strain states, compression, tension, bending, shear, deformation, adhesion