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  • Reviews, suggestions and discussions

  • Construction control in the project of work production

    This article is devoted to the problems associated with the development, control and execution of one of the most important sections of the project documentation, namely, the project of work production. The authors reveal the problem of non-consistency of the data available in the regulatory documentation regulating the provisions for the development and control of the project of work production. The article presents a brief chronology for the last period on the state of the regulatory framework, methodological guidelines and current regulations for the development of sections of the project of work production. The authors of the article show the features of individual regulatory documents, and their relationship in terms of the development and control of the project of work. The materials contained in the article will help to provide a better understanding of construction participants, designers, construction control specialists and performers of work on the construction site of the purpose and role of the sections of the work production project.

    Keywords: Technical supervision, construction control, control and supervisory activities, construction production technology, construction organization, work production project, construction organization project

  • Diagrid system review as constuctions made of rods mesh

    The article provides a brief overview of the creation of the Diagrid system, describes the concept of forming this structure, its key elements and their role in creating geometrically immutable integral structures. The main directions of application in construction and the peculiarities of work on vertical and horizontal force effects are given. It also provides an overview of the materials of construction used and the main design constraints. This article will be useful for design engineers and architects engaged in the design and calculation of high-rise buildings, as well as buildings with a complex architectural form made of reinforced concrete and metal structures.

    Keywords: diagrid, mesh supporting structures, reinforced concrete structures, metal structures, stability, free architectural form

  • Criteria for evaluating the effectiveness of transformation of objects of the property complex in managing the development of the city territory

    The relevance of the research topic is due to the problem of choosing options for converting property complex objects for the purpose of sustainable development of the city territory. The main task currently being solved at the state level is aimed at developing urban planning documents for the strategic development of urban territories. The developed documents have a positive impact on stimulating the development of a modern urban economy, high-quality territorial planning, lifting infrastructure restrictions in cities, and creating "smart territories" that are distinguished primarily by an effective management system and taking into account the opinions of the main stakeholders related to this territory. In this regard, there is a need to develop criteria to assess the prospects for the development of the territory of the municipality, taking into account its specific features and limitations. The purpose of the research is to create a simple, consistent system of criteria that is convenient for use in working with various objects of the property complex. To do this, first of all, it is necessary to identify the factors that affect the efficiency of the use of the property complex and the relationships between them, which will allow us to explore various options for the development of the property complex based on scenario modeling. The results of the study can be used to improve the efficiency of urban management, ensure sustainable development of the territory of the municipality, and improve the quality of life of the population.

    Keywords: management of the territory, the object of the property complex, performance criteria, management decision, sustainable development of territories, decision support system

  • Technical science. Informatics, computer facilities and management

  • Assesment of information security during data transfer between access subjects in the client-server architecture

    As a result of the work, an algorithm was developed and a software tool was implemented that allows ensuring the confidentiality of information in the interaction between access subjects. The study of the dependence of the selected parameters of the elliptic curve on the processing time and transmission of the encrypted message has been carried out. Studies have shown that with an increase in the values of the parameters of the elliptic curve, the time for processing confidential information increases due to insufficient system resources.

    Keywords: confidential information, information leakage, asymmetric encryption, information reliability, system resources, communication channel

  • Modeling of the temperature effect on biological tissues during their laser incision

    The paper deals with the issues of modeling the processes of laser radiation absorption in contact with a biological object, which leads to a significant increase in temperature in the interaction zone. For organic tissues, when the temperature rises above a certain value, their damage begins, and then the processes of destruction are observed. With an increase in the speed of movement of the laser beam on the surface, the width of the incision and the level of injury decrease, as the time of interaction of the radiation with the tissue decreases. In this paper, we consider various models for performing calculations: using complex ratios taking into account the thickness or using expressions for an object of semi-infinite thickness. The regularities of the growth of the average temperature and the process of establishing the thermal balance on the surface of the body, depending on the parameters of the laser radiation pulses, are also investigated.

    Keywords: computer simulation, medical laser, laser incision, biological tissues, temperature field, level of injury, pulse packet, speed of movement

  • Development of a software module for drawing and report generation based on the results of strength validation of metal structures in a two-dimensional setting

    Bar structures are widespread in construction due to their economy, freedom of design shapes and sizes. As a result, automation of design and calculation of such structures is an urgent task. As part of the study, the task of developing a software module that generates output documents of a web application for calculating bar metal structures has been implemented. The software is developed on the .NET platform using the Spire.Doc and netDxf plug-in libraries. The developed module generates AutoCAD-compatible drawings and text reports in accordance with Russian standard SP 16.13330. The possibility of automated generation of reports allows more efficient use of the computing complex in production, cost reduction and calculation accuracy increase.

    Keywords: Design in construction, bar structure, computing system, web development, report, drawing

  • Development of authentication protocols for low-orbit spacecraft based on parallel codes of residual class systems

    Low-orbit satellite communication systems (LowSCS) are successfully used to organize stable communication in Northern latitudes. With the help of theLowSCS, effective management and monitoring of the process of production and transportation of hydrocarbon raw materials is provided. This approach allows us to ensure minimal costs for the extraction and delivery of oil and gas from fields located on the shelf of the Arctic Ocean. As the number of countries engaged in the development of Arctic Ocean deposits increases, so does the number of LowSCS groupings. To prevent the possibility of interception and imposition of a delayed command to control the intruder satellite, it is necessary to increase the information secrecy of the LowSCS with the help of "friend-foe" identification systems for the spacecraft. At the same time, to ensure high imitability in such systems, it is proposed to use zero-knowledge authentication protocols. To increase their efficiency, the article suggests using the codes of residual number system (RNS). The novelty of this idea is that the use of parallel SOC codes will reduce the time spent on performing arithmetic operations implemented in authentication protocols. And this, in turn, will lead to an increase in the information secrecy of the NSSS, so the probability of selecting the correct response signal by the intruder satellite decreases. Therefore, the purpose of the article is to develop authentication protocols for low-orbit spacecraft based on parallel codes of residual class systems, the use of which will reduce the time for satellite identification.

    Keywords: satellite identification system, zero-knowledge authentication protocols, residue number system

  • Current state of innovation infrastructure Development in the NCFD subjects

    An assessment of the innovation infrastructure of the regions of the North Caucasus Federal District was carried out, which showed that their organizational structure does not create conditions for the effective functioning of innovative processes, which is expressed in weak innovation activity, a small number of innovative firms, a low degree of commercialization of scientific developments and their implementation efficiency, in the absence of effective market mechanisms. financing science and innovation.

    Keywords: innovation infrastructure, innovation activity, regional economy, institutional environment

  • Algorithms for the chatbot to search for products

    This article discusses the algorithms used for the operation of the chatbot. Within the framework of these algorithms, a general approach to the operation of dialog systems is considered. And the algorithm of the dialog system is proposed, based on a general approach, which includes a natural language processing module. The algorithms that will be applied to the chatbot to search for products of interest to the user are also presented. Among the considered algorithms are such as the algorithm of interaction between the user and the chatbot, the processing of user requests and the algorithm of natural language processing. A modified algorithm for natural language processing is also presented, taking into account the necessary requirements.

    Keywords: chatbot, natural language processing, user request processing, named entity recognition, dialog manager, dialog system

  • Problems of using additional devices to expand the diagnostic capabilities of certain physiological parameters and ways to solve them

    Diagnostic imaging is a necessary procedure for the accurate diagnosis and treatment of at least 25% of patients worldwide. Therefore, the expansion of opportunities for interaction between the doctor and the patient at a distance during instrumental diagnostics leads to an increase in positive treatment results. This article discusses the ways and problems of using additional devices, including robotic systems, in diagnostics. Having investigated the ways of using ultrasound diagnostic devices as the most informative and useful diagnostic method, and complementary technologies for expanding the capabilities of ultrasound diagnostics, the general principles of working with this equipment were determined. An algorithm for working during the survey was also developed. The definition of these principles allowed us to develop our own solution to the problems that arise when conducting a survey using these technologies.

    Keywords: interactive medicine, patient, health status, health diagnostics, severity, condition assessment, counseling, instrumental diagnostics, personalized medicine, services

  • About measures for stabilization of process of preparation of hot water for sanitary needs in boiler room No. 2 of "Energoservice"

    In this work, a survey of the hot water supply system from the boiler house No. 2 of Energoservice LLC was carried out. The daily schedule of hot water released for sanitary needs is given. The existing scheme of the boiler burner on-off control system is considered. A method for stabilizing the hot water preparation process by increasing the burner shut-off settings at the hour of the highest water consumption is found and described, and their values are found experimentally. A scheme has been developed, assembled and tested that allows you to adjust the operating mode of boilers at a strictly specified time of day. The proposed measure allowed us to solve the problem of selling hot water to consumers of a given quality during the maximum water intake period. In addition, the reduction in the generation of thermal energy for heating hot water at night and on weekends allowed for a 13.87% reduction in natural gas consumption in 2020.

    Keywords: hot water supply, fuel consumption, pumping station, circulation line, conditional fuel, mode, boiler unit

  • Technical science. Building and architecture

  • History of development and features of the device and application of green roofs at the present stage

    The article describes the main stages of development of the construction of green roofs in Russia and abroad, the basic scheme and the technology of green roofs.

    Keywords: Green construction, green roofing, environmental certification, noise pollution, drainag

  • Bearing capacity reserve of the bridge structure across the Kalmius river in Donetsk city

    Engineering calculation and estimation of the stress-strain state of the bearing elements of the superstructure is carried out. The analysis and collection of information on traffic in 2019. The history of the loading bridge real load on the basis of mathematical model (presented in the form of a geometric progression) – showing an annual increase of intensity of traffic on bridge construction. The total fatigue damage of the bearing elements of the superstructure according to the Palmgren - miner hypothesis and the period of exhaustion of the operational resource of the bridge structure are determined.

    Keywords: load capacity, loading, history of loading, residual resource, the miner's summation of fatigue durability

  • The use of high-functional concretes in the modernization of the production technology of prestressed airfield slabs

    The article presents the results of the analysis of the modern market for the production of precast concrete products and existing technologies for their production, as well as a description of the possible method of modernization of the technological line and the production process. The main goal of the modernization is to eliminate vibrating stations and the use of self-compacting concrete mixes from the production line, which significantly increases the plant's productivity, increases the service life of molds, reduces the production time of the product and reduces financial costs.

    Keywords: high-functional concrete, self-compacting concrete, production modernization, road slab, production of reinforced concrete products, conveyor production technology

  • Economic assessment of managerial decisions aimed at reducing the dose rate

    In modern buildings constructed of mineral raw materials, the role of various components of natural sources of ionizing radiation, which form the radiation exposure levels of people, has changed significantly. The article considers the cost estimation of replacing construction materials with an enhanced effective specific activity (Aeff) with alternative materials with a lower Aeff. It has been revealed that the monetary equivalent taking into account the radiation safety depends mainly on the difference between the specific activity values of natural radionuclides (NRN) in construction materials and on the number of inhabitants. With a reduction in the difference between the Aeff values, the cost of the replacement (Ruble/t) of the materials decreases and the monetary equivalent grows.

    Keywords: ionizing radiation, effective specific activity, monetary equivalent, collective effective equivalent doses

  • Transverse vibrations of the gas discharge shaft made of a polymer thermosetting self-supporting shell "Furanflex" with a finite number of degrees of freedom with uniform fixing in height

    This article discusses the theoretical order and practical solution of the problem of calculating the transverse vibrations of a thermosetting polymer self-supporting shell pipe " Furanflex».Сalculation scheme with a finite number of degrees of freedom.The pipe is evenly fixed in height.The procedure for creating a universal calculation algorithm for determining the natural frequencies of pipe vibrations is considered in detail.When creating an algorithm and calculating natural frequencies, determining coefficients, plotting plots, the Mathcad software package is used.When creating an algorithm and calculating natural frequencies, determining coefficients, plotting plots, the Mathcad software package is used. The article may be of interest to design engineers, specialists in calculating the dynamics and strength of structures and specialists of heat-generating companies and thermal power plants, teachers and students of universities in the construction industry.

    Keywords: eigenvalues, polymer tube "furanflex", eigenvalues of the matrix

  • Investigation of hazardous and harmful factors of the technological process of calcium silicate brick manufacturing

    The technological process of coloured calcium silicate brick differs from the usual manufacturing of white calcium silicate brick by additional emissions of harmful substances in the form of dust of colour pigments. The given article considers the properties of dust particles emitted into the working zone air in the manufacturing shops of coloured bricks, the harmful properties of the dust that negatively affect human health, as well as the potentially hazardous properties of these substances that may lead to tragic consequences caused by explosions or fires.

    Keywords: coloured calcium silicate brick, fine dust, explosion, source of ignition, colour pigments

  • Research of building structures of existing buildings, various technological conditions, in order to determine the scope of their secondary use

    The purpose of our work was to search for possible options for the secondary use of destroyed brick buildings and structures. We conducted tests to verify the strength characteristics of bricks taken from the sites of reconstruction and complete demolition of buildings and structures. In the course of which, conclusions were drawn about the possibilities of further use of brick scrap from different places of demolition of building structures.

    Keywords: demolition, scrap, building, structure, brick, recycling, testing, strength, recycling, iron concrete

  • Analysis of the competitiveness of an enterprise that produces construction products

    The concept of competitiveness in the construction sector is considered. The assessment of the competitiveness of the enterprise for the production of construction products was carried out. The ways of increasing competitiveness using the results of SWOT analysis are considered.

    Keywords: competitiveness, competitor, construction market, quality, enterprise, SWOT analysis, integral indicator of competitiveness

  • Comparison of survivability of various types of steel archic structures

    Arched constructions of the roofs of span-type buildings are very cost-effective in comparison with beam and frame systems. In many cases, the high architectural qualities of arch structures allow one to obtain expressive interiors of large halls. At the same time, the construction of long span buildings is always associated with high risks, high security requirements for such buildings, and, consequently, increased requirements for reliability to load-bearing structures, including possible local destructions. Actual becomes the issue of ensuring the survivability of building structures in general, and the construction of roofs for long span buildings in particular. To analyze the survivability properties of shallow arched coverings, a number of constructive solutions of arched constructions of various types are considered. The work of arch structures of various types with possible local caving of a number of elements is considered. Five design schemes of arched constructions are presented, and work of each of them is considered at exclusion of the most loaded elements. In particular, the work of the arch structure with fan-shaped tie system with a split upper belt is considered. A comparative analysis of the survivability properties of the constructive solutions under consideration is presented.

    Keywords: arched covers, arch structure with fan-shaped tie system, survivability, local destruction, constructive solutions, long span roofs, progressive collapse

  • Planning the sequence of construction of buildings in the quarter development

    This article discusses the issue of planning the sequence of construction of buildings in the quarter development. The authors analyzed and classified the factors that can influence the choice of the sequence of construction of objects in complex development. An algorithm for planning the construction sequence is proposed, which the considered factors are included in the model, taking into account the ranking of their significance.

    Keywords: stream method, quarter development, line arrangement, quarterly arrangement, sequence of construction, situational factor, unforeseen factor, social factor, production factor

  • Comparison of statically undetectable prestressed reinforced concrete trusses

    For the statically indeterminate systems under consideration, there is an optimal ratio between the load-bearing capacity of stretched and out-of-center compressed elements, in which the required reliability will be provided at the lowest value of the mathematical expectation of an external destructive load. It should also be noted that for statically indeterminate systems, the beginning of rebar fluidity is not a sign of destruction, but only indicates the beginning of an intensive redistribution of forces in it. Therefore, the values of C, do not refer to the beginning of the rebar flow, but to the complete exhaustion of the load-bearing capacity. The reliability of statically undetectable systems, including prestressed trusses, is always higher, all other things being equal, than that of statically definable systems.

    Keywords: reinforced concrete, reinforced concrete structures, statically indeterminate systems, reliability