The article analyzes the peculiarities of the organization and technology of repair of urban roads in conditions of dense traffic. The technological parameters of pavement repair, considering uneven temperature and peculiarities of compaction of hot asphalt-concrete mixtures, have been substantiated.

Keywords: Urban roads, multi-lane highways, pavement repair, roadway, asphalt pavement, defects

The article considers the directions of development of energy, transport and water facilities through the use of liquefied natural gas.

Keywords: liquefied natural gas, energy, methane, motor transport

The object of the research is the utilization heat exchanger. The purpose of the work is to develop a design of a heat exchanger (HA) used to recover the heat of exhaust gases from a gas turbine unit (GTU) with an increased thermal power. In the process of work, the calculation and numerical modeling of the new design of the heat exchanger was carried out. The result of the research was the design of a gas-air heat exchanger, which requires 6.5% less flow rate of the coolant (exhaust gases) compared to the prototype.

Keywords: heat exchanger, heat utilization, energy efficiency of a gas turbine unit, numerical modeling, gas-air heat exchanger

The article considers the results of a study aimed at establishing the constants of enzymatic kinetics of biological treatment of domestic wastewater in low-oxygen bioreactors of the circulating type and proposes methods for calculating such structures using the dependences of enzymatic kinetics Michaelis-Menten. The technological mode of operation of the reactor implies a total oxygen regime of not more than 1.1 mg / l at horizontal flow rates of 0.25-0.3 m/s. The efficiency of wastewater treatment is achieved by increasing the mass transfer of oxygen to the sludge mixture and directly into the flocs of activated sludge, as well as due to aerobic granulation by built-in secondary settling tanks.

Keywords: nitrification, denitrification, activated sludge, aeration tank, granular activated sludge, biological treatment, domestic wastewater, low-oxygen treatment method, energy saving, resource saving, ecology

This article considers the development of an information-measuring system for determining the thermophysical parameters of electrical devices. The developed functional diagram of the device is presented. Experimental studies were carried out in the COMSOL program. As a result of an experimental study of the transfer of heat from one part of the electromagnet to another, namely from the magnetizing coil, through the core to the environment, it was concluded that the best location of the temperature sensors is in the upper part of the body of the electromagnet EM-34-5. The data obtained can be used to determine the thermophysical parameters, in solving problems of the theory of inverse problems of heat transfer and heat transfer.

Keywords: information-measuring system, electrical devices, thermophysical parameters, COMSOL

An algorithm is given for carrying out repair work in rooms where devices with ionizing radiation sources are located (inspection points, X-ray machines, computed tomography devices, mammographs, etc.). All stages of the work are considered: the development of documentation, the conduct of examinations, the implementation of construction and installation works, the commissioning of the object (apparatus). Practical recommendations are given on the preparation of the required design and estimate documentation and repair work. The article was written on the basis of completed research work No. 20-147.

Keywords: construction and installation works, repairs, buildings and structures, ionizing radiation sources, X-ray machines, computed tomography devices, expertise

This article considers one of the parts of the development of the input control device for film capacitors. Structural and functional schemes have been developed. The results of modeling the measuring circuit in the Microcap software package are presented. The results of the model experiment confirm the correctness of the calculations.

Keywords: input control, film capacitors, Arduino, Microcap, diagnostics

A method of selecting admixtures for the production of dry building mixes is proposed based on the results of an expert assessment of the complex indicator of the workability of application (connectivity, continuity when pulling with a toothed trowel, elasticity, quality of rollers) on a 100-point scale and the strength of adhesion to the concrete base, followed by the calculation of the specific cost of admixtures in the mixture per ton of products, respectively, by one point of workability of application and 1 MPa of adhesion strength, developed as a result of studies of adhesive mixtures made using 4 different cements, 5 water-retaining additives and 12 redispersible polymer powders. The possibility of obtaining adhesive compositions of adhesion class C 2 using redispersible polymer powders of domestic production is shown.

Keywords: dry building mix, adhesion strength to the base, unit cost, processability of application

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 article is devoted to the problem of certification of construction projects according to new environmental standards in Russia and abroad. The main characteristics of foreign certificates BREEM, LEED, HQE and domestic "Green Standard", SDS "RUSO", EcoGreenOffice are presented; certification implementation processes; the main factors of green building. The problems of certification of real estate objects in Russia, as well as ways of solving these problems, are analyzed.

Keywords: certification, environmental standard, energy efficiency, green building, environment

In this article, the actual topic of project activities in the framework of the modernization of higher education in Cambodia. In this article, we analyzed the situation due to which among recent university graduates there is a shortage of highly qualified personnel in such areas as agriculture, exact sciences, mechanical engineering and manufacturing. We also studied information about the largest university in the country - Queen Phnom Penh University.

Keywords: higher education, modernization, innovation, Cambodia, Russia

This article is devoted to the study of the characteristics of fine dust particles in the gym. The monitoring of the dust content of the sports premises with fine particles was carried out, and the dispersed composition of the settled dust was also studied. The regularity of the dust distribution in the room depending on the measurement height is analyzed. The analysis of the state of the system of external respiratory organs is carried out.

Keywords: monitoring, gym, dispersion analysis, fine particles, respiratory organs, PM2. 5, PM10, dust factor

This paper demonstrates an approach to data visualization using manipulations with json data. Based on the Dimensional Charting library, you can render graphical information taking into account the processing of big data, since interactive data visualization in the web interface is widely used in analyzing user traffic on the Internet. Dimensional Charting is the link between the two built-in libraries. The Crossfilter library is responsible for sorting, filtering big data, and d3.js it is necessary for drawing graphic material on html pages. Thanks to new technologies, you can process big data without using third-party programming languages.

Keywords: data processing, data visualization, filtering, sorting dimensional charting, javascript, json, crossfilter, data-driven documents

One of the methods of thermodynamic stabilization of AN (ammonium nitrate) crystals, which is currently used not only as nitrogen fertilizer, but also as an environmentally friendly oxidant for gas-generating fuels for various purposes, is the technology of obtaining low-defect crystal structures. It is known that the potassium ion is a phase stabilizer of AN, and chlorine-containing compounds affect the rate of thermal decomposition of AN; therefore, there has been made an attempt to use a modifier, which includes both elements: potassium salt of monochloroacetic acid (PMCHAA) and to study its effect on phase transitions and thermal decomposition of AN depending on the amount of additive, type of solvent and crystallization temperature. As a result of the tests, it has been found out that a sample containing 1% PMCHAA (obtained at 80 ° C from an aqueous medium) most fully meets the requirements for EnCS oxidizers: the rate of thermal decomposition of the sample is 2.65 times higher than that of AN crystals recrystallized under the same conditions; the rate of modification transition IV – III has been reduced by almost 3 times

Keywords: ammonium nitrate, oxidizer, gas-generating compositions, polymorphic transition, thermal decomposition, additive, kinetics, thermodynamics, potassium salt of monochloroacetic acid, solvent, co-crystallization

In modern times due to the growth of mass production of electronic devices, it becomes necessary to quickly and accurately verify their characteristics. At the same time, device testing, as a rule, includes a set of different types of checks performed at different stages of the production process. In particular, the analog signature analysis method is used for these purposes. It allows you to quickly detect faults at the component level, which makes it useful in various stages of production, such as incoming inspection, testing printed circuit boards or repairing faulty devices. This article discusses the basic principles of the method, as well as the features of its application.

Keywords: analog signature analysis, component level testing, current-voltage characteristic, fault localization