The article is devoted to the study of the adequacy of the model of a waveguide with a bottom in the form of half-space in broadband calculations of sound fields. Two bottom models are considered: liquid and porous. Two depths of the water layer are considered - units of meters and tens of meters. In the case of a liquid bottom, the speed of sound and the loss tangent in the bottom are considered to be frequency independent (model with a bottom with constant quality factor). In the case of a porous bottom, the frequency dependence of the speed of sound and the loss tangent is extracted from experimental data published in open sourses. The frequency dependences of the group velocities of the modes and modal attenuation coefficients are calculated. The frequency dependences of the group velocity of the first mode for the two waveguide models coincide, and the critical frequency of the normal modes changes in proportion to the depth of the water layer. The frequency dependences of the attenuation coefficient of normal modes turn out to be significantly different. The impulse response of shallow and deep-water waveguides are simulated. It is shown that in the case of a waveguide with a water layer depth of a few meters, the temporal structure of the impulsive field is indistinguishable - the bottom model without dispersion is adequate. In the case of a water layer depth of tens of meters, the temporal structure of the pulsed field for two bottom models is different - the waveguide model with a bottom without dispersion is inadequate.

Keywords: liquid bottom, porous bottom, marine sediments, dispersion of phase velocity, group velocity, intramode dispersion, intermode dispersion

One of the most pressing problems in the oil and gas industry is numerous pipeline accidents that require innovative solutions. This article analyzes a promising method of repair using composite couplings, which include many advantages compared to steel structures. The strength characteristics of the couplings are also given and their installation process is described.

Keywords: Oil pipeline, overhaul, reinforcing composite coupling, composite materials

This article analyzes the existing sources of power supply of oil and gas industry facilities, as well as the study of the possible use of alternative energy sources in industrial enterprises; The advantages and disadvantages of using this type of power supply for remote infrastructure are considered.

Keywords: energy, power supply, power plant, industrial facility, wind, solar radiation, power, power plant, wind energy, source

the article presents a comparison of methods for modeling the Foundation of the span structure of the technological transition on permafrost soils in the LIRA-CAD 2015 software package.Numerical simulations using methods such as pinching (linking) and modeling of pile Foundation and soil Foundation showed a significant difference in the calculated values. The conducted research confirms the need to calculate this type of building structures taking into account the influence of the soil base.

Keywords: span structure, technological transition, pile, base, foundation, frozen ground, LIRA-CAD 2015, strength, stiffness, stability, soil model

The article deals with the issues of regulating the stress-strain state of the design scheme of the coating of the demonstration center by combining the geometry of the interface of the crossbar and the cross frame post. The dependence of the distribution of forces on the solutions of the eaves of the roof truss is established.

Keywords: Arched constructions, finite element method, stress-strain state regulation, optimal design

The calculation algorithm is given and various options for solving the problem are considered when changing the parameters of the design scheme of the rod system on the example of a beam in the MS Excel software environment together with the MathCAD package. The proposed approach allows you to combine formulas, graphics, and calculation results on a single sheet, which is especially useful in the educational process. It contributes to a more conscious perception of the calculation process by students, allows them to implement various forms of distance learning in information technologies.

Keywords: the core of the system, algorithm, modelling, integration, information technology

The authors of the article consider external socio-economic and internal motivational factors in the formation of reproductive behavior of young families living in the Rostov region. Based on empirical data, the authors of the work conclude that young spouses occupy quite active economic positions in the region we are studying. These professional strategies have a dual effect on reproductive behavior, determining the choice of one-child family model in the region

Keywords: model, cognitive analysis, family, young family, life strategies, value orientations reproductive behavior

This paper describes the tools for managing the Windows operating system - Windows Management Instrumentation, and also analyzes its applicability for monitoring and auditing the enterprise IT infrastructure. The main WMI classes and their purpose are given. Two methods for using WMI are described: local and network. In addition, the advantages and disadvantages of each method are given.

Keywords: operating system, Windows, Windows Management Instrumentation, WMI, audit, monitoring, IT infrastructure, wbemtest

The directions of modern research in the field of adaptive error correction, which can be applied when transmitting images in JPEG 2000 format over a noisy channel, are examined. Adaptive correction at the network level allows you to maintain a given percentage of packet delivery. Uneven protection at the application level is intended for use in broadcast broadcasts and allows the consumer to receive an image of various quality depending on the state of the network. Adaptive uniform protection at the application level is focused on point-to-point transmission and is aimed at receiving the maximum image quality by the receiver. The network layer tools discussed can be combined with the application layer tools.

Keywords: adaptation, noise-proof coding, forward error correction, noisy channel, JPEG 2000

To assess the impact of various groups of sources of emissions in urban pollution, there is a method that can be called the main one - the assessment of the contribution to total gross emissions. But this method does not take into account the significant features of dispersion of pollutant emissions in the atmosphere, as well as the specifics of the mechanisms of formation of concentrations of pollutants at a specific point in the city and the calculation of complex indicators of the level of air pollution in urban areas. The authors proposed a procedure for calculating the atmospheric pollution index for source groups using the “summary calculations” tool. The calculations were carried out on the licensed software product "Ecologist-city". Based on the calculations, conclusions were drawn on the reliability of determining the influence of various groups of emission sources on air pollution in the city of Krasnoyarsk, based on the assessment of contributions to the total gross emission in the city.

Keywords: atmosphere, air, ecology, ecology of urban areas, environmental safety, summary calculations, IZA

The article discusses the main problems in carrying out construction work in cramped conditions. A survey was conducted among the construction participants, recommendations were given on the selection of organizational and construction solutions.

Keywords: cramped conditions, noise, environmental safety, organizational and technological solutions, point building, environment, technological environment, construction organization, construction technologies, BIM, VR, integrated solutions

The results of a study of the development of a polymer heat-insulating coating for the insulation of heated metal surfaces of industrial and engineering equipment, industrial plants, building structures, working surfaces of pipelines operated at low (up to 1000C) temperatures are presented. The coating was developed on the basis of a polymer binder, which is a mixture of styrene-butadiene rubber and acrylic polymer, hollow carbon microspheres, pigment and water. The use of hollow carbon microspheres in this coating as a filler in an amount of 20.0 to 30.0 parts by weight reduces the thermal conductivity of the coating, compared with the known containing hollow glass or ceramic microspheres.

Keywords: thermal insulation coating, polymer binder, hollow carbon microspheres, thermal conductivity, tensile strength

The results of the development of a polymer coating with high heat-insulating and fire-resistant characteristics containing waste from galvanic production are presented. This coating is designed for thermal insulation and fire protection of concrete and metal surfaces of various building structures and industrial equipment. The coating is developed on the basis of siloxane rubber, K-18 catalyst, hollow carbon microspheres and industrial waste - galvanic sludge used as a flame retardant. The use of hollow carbon microspheres provides an increase in the strength and thermal insulation properties of the coating. The use of galvanic slurry in the amount of 5-15 parts by weight it allows to obtain the effect of self-extinguishing of the heat-insulating coating, reducing the burning time without compromising the operational properties - strength, adhesion, while solving another important problem - the safe disposal of galvanic sludge. Studies have shown that the use of this composition allows you to get a relatively inexpensive, but quite effective polymer coating with good thermal insulation, flame retardant and physico-mechanical properties.

Keywords: polymer coating, siloxane rubber, hollow carbon microspheres, galvanic sludge, thermal conductivity, strength, self-extinguishing effect, safe disposal

The article presents the results of an on-site test spatial metal farm of an aircraft hangar with a span of 72 m. A comparative analysis of the data obtained by the simulation of the farm from the predicted loads (taking into account the actual geometry) and the on-site tests is performed. During the assessment of the technical condition and testing, significant errors were identified in the design and manufacture of gate frames structures,which could lead to loss of bearing capacity or unsuitability for normal operation. Based on the test results, measures were developed and implemented to strengthen the elements of the farm, repeated full-scale tests were conducted. Based on the foregoing, the span structure is recognized as suitable for safe operation.

Keywords: test, metal truss, bolted connections, compliance, bearing capacity, deformability, gate frame, reliability, static calculation

The aim of the study was to identify the optimal choice of the set of leading machines according to the ratio of such parameters as "Time" and "Cost." Within the framework of the study, the scheme of selection of the set of machines in accordance with geotechnical and production conditions of the construction area and economic conditions of the potential customer was determined, as well as a table of selection of machines depending on the initial parameters was drawn up.

Keywords: excavations, a set of leading machines, soil category, distance of soil transportation, the volume of the pit, the volume of the excavator bucket, continuity of work, cost, work duration, cars dump trucks