This article discusses the most common materials and how they are used to protect against ionizing radiation used for medical purposes. Comparison of technical and economic devices for the construction of a protective fence from the described radiation protection materials is presented. The effectiveness of the use of self-adhesive polymer radiation-shielding materials for protection against insulation with voltage up to 100 kV has been established.

Keywords: gamma radiation shielding, radiation shielding, EPDM, metal oxide, barite, polymer composites

The article discusses the causes of accidents in water supply and sanitation systems. methods for improving the quality of drinking water in the construction and reconstruction of water pipes, the use of new materials to reduce breakdowns on networks are considered. the analysis of the durability of pipelines made of various materials is carried out, according to which it is concluded which material is the best in use for installation work. frequent destruction of pipes occurs from an aggressive environment, so a comparative analysis of various materials from which they are made: polyvinyl chloride, polypropylene, reinforced concrete, cast iron and fiberglass. due to poor-quality cleaning, there are environmental problems that occur when using old structures, lack of funding. It is concluded that fiberglass pipes can serve as a high-quality material.

Keywords: quality water, replacement of pipelines, water supply and sanitation, corrosion and destruction of pipes, new polymer material, pipe materials, comparison of pipes made of different materials, service life, wastewater treatment, ecology

The article deals with the laws of distribution of pollutants in a linear city. The highest values of carbon monoxide concentration were determined in the near-main territories of the Krasnoarmeysky district of Volgograd. Also in this paper, the question of the dependence of the level of gas pollution in the mainline areas on various factors, which include human activity and natural, natural factors, is raised. The influence of temperature inversions on the speed of pollution propagation and their limiting value in various points of the city is considered. For the experimental part, 18 points of technical measurements of CO concentration were taken, during which compliance with the MPC standards of the samples taken was revealed.

Keywords: linear city, district, law of distribution of carbon monoxide, transport of impurities, air pollution

Based on the results of engineering and geological survey of real construction sites in Rostov-on-Don and the Republic of Kalmykia, the dynamics of subsidence processes on laboratory samples of loess soil tested for compression according to the "one curve" scheme according to GOST 23161-2012 was studied.

Keywords: subsidence, compression compression, odometer, loess soil, subsidence pressure, surveys, geomechanics, soil mechanics

The article describes the device and principle of operation of the Kurzanov-Semyonov kinematic support. Advantages and disadvantages of this type seismic isolation are also highlighted. In addition, the structural design scheme of the operated high-rise apartment building with and without kinematic support system was created in the Lira-CAD software package (CAE FEA software). Based on the computing results, a comparative analysis of the reaction of the building superstructure block under the influence of wind force in three directions was carried out. It was determined that the wind force does not affect the performance of the kinematic support system negatively.

Keywords: kinematic support (KS), seismic isolation, seismic protection, wind, wind load, Lira-SAPR, finite element method, shift, modal analysis

One of the main directions of Russia's housing policy is the elimination of dilapidated housing stock. Commissions are established to assess the technical condition of buildings to reduce the number of dilapidated buildings in municipalities. At the same time, the number of surveyed buildings is growing every year. There are no special measuring devices in municipalities. It means that method used to assessment of physicaldeterioration should be simple, fast and giving reliable results. There is comparative analysis of the three methods for assessing the technical condition of buildings in this article on the example of the apartment building in Yekaterinburg. The results of the evaluation are compared, the advantages and disadvantages of each method are determined according to the criteria of practical using by specialists of municipalities. Based on this results the need to develop a combined method for determining the technical condition of buildings, taking into account the conditions of the survey, is determined. The introduction of such a method will speed up the process of creating a safe and comfortable living environment for citizens, which will contribute to the socio-economic development of the region and the country.

Keywords: technical condition, physical deterioration, emergency condition, dilapidated residential building, categories of technical condition, methods of assessing physical deterioration, inspection, defect, damage, demolition

Information modeling of construction processes should be attributed to the actual problems of development of technology and organization of construction. An important part of the information model is the geometric description of the technological sites (excavator faces). When designing technological sites (faces) of excavators, it is recommended to use the maximum digging radius on the ground surface as a criterion, taking into account the conditions of work (types of soil). To calculate the minimum value of the digging radius, a mathematical expression is proposed, which contains a complex indicator describing the physical and mechanical characteristics of the soil (tga). The results obtained allow us to cut off earthmoving machines at the decision-making stage by the size of the maximum digging radius on the earth's surface. These results describe the first step in the information modeling of the process of excavation by an excavator.

Keywords: excavator, technological parking, digging radius, slope angle of the ground slope, geometric dimensions of the face, pit, distance from the edge of the bottom of the pit to the excavator support, information model, productivity, robotization

Currently, high pressure sodium lamps are the light source in greenhouse vegetable growing. The most promising sources of artificial lighting are LED-based irradiators. They can provide a cooler temperature environment to bring plants closer to plants. The aim of the study is to determine the economic life of sodium and LED light sources in greenhouse vegetable growing, taking into account their degradation for the harvest. LEDs, like sodium lamps, degrade during use. This leads to a decrease in the light (photosynthetic photon) flux of light sources and, as a result, to a decrease in yield. Due to this certain functional dependence on the luminous flux level, the economically feasible life of the light is predicted.

Keywords: light sources, luminous flux, LED lamps, sodium lamps, productivity, energy efficiency, economy

The article is devoted to the issue of improving devices for cleaning gas station emissions from hydrocarbon vapors to improve the environmental safety of inhabitant zones and territories of residential development. It is known that emissions of benzene vapors belonging to the second hazard class have a significant problem in terms of exceeding the maximum permissible concentrations at the borders of the sanitary protection zones of gas stations and nearby residential buildings. The largest part of the release of gasoline vapors entering the local aspiration systems is associated with the filling and emptying of fuel storage tanks at gas stations. To reduce emissions from gas station sources, it is proposed to use absorption-type devices in gasoline vapor recovery units. The article presents the results of experiments on a pilot - industrial plant set up with an apparatus for cleaning gas station emissions from benzene and other hydrocarbon vapors using a solution of a mixture of natural sodium-magnesium salts. As a liquid sorbent in such devices, it was proposed to use waste water from a gas station purification device in order to reduce the additional amount of waste generated during their operation. Based on the results of processing the experimental data, a graphical dependence and regression equations were obtained. The areas of aerohydrodynamic regimes at which the highest efficiency is achieved for the parameters of the apparatus of the studied modification are determined. This approach also makes it possible to reduce the negative technogenic impact of gas stations in terms of the generation of additional waste. The successful tests carried out have shown the reliable and efficient operation of the pilot plant set up with the proposed device.

Keywords: gas station, gasoline, emission, atmosphere, fuel, hydrocarbons, aspiration, absorption, device, bischofite, water