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  • Reviews, suggestions and discussions

  • Technology and organization of a protective-trapping system in construction

    The article considers one of the main systems that ensure the safety of workers and passers – by in a dangerous zone-the protective-catching grid. The types of grid systems, basic principles of their operation, and technical characteristics are described. The requirements for the installation and operation of such systems are considered.

    Keywords: grids, construction, security, organization, security screens

  • Contemporary technological solutions in the design of facades

    The article provides a comparative analysis of facade systems used in the construction of buildings in Russia and abroad. The features and requirements put forward to modern facades in the context of aesthetic, operational and energy-saving characteristics are examined in detail. Special attention is paid to ventilated and non-ventilated systems. It also analyzes the state and dynamics of the facade materials market in Russia. The features of the application of technological solutions in the design of facades in different countries of the world, such as: Germany, Poland, North America, are indicated. The results obtained led to the conclusion that in the market of facade insulation systems in Europe, stucco facade systems were more widely used. In Russia, more than 50% of the market belongs to ventilated facades. In America, innovative “smart” facades are widely spread.

    Keywords: facade, facade system, ventilated facade, plaster facade, technology, materials, building, enclosing structures, exterior walls, maintenance

  • Improvement of the executive documentation preparation for construction of buildings and structeres in modern conditions

    The main part of the technical documents in creation, reconstruction and capital repair of buildings and structures consists of technical executive documentation. Its formation, design, processing demand a lot of time and labor expenses. With the purpose of optimization of these processes and decreasing of work expenses it is necessary to appeal to automatic means of control and exploitation of executive documentation. In the article there are considered technical possibilities of the programs, allowing to simplify compilation of technical executive documentation at construction plant.

    Keywords: construction, executive technical documentation, automatic method, optimization, construction control, software systems, systematization of documentation

  • Features of technical operation of cultural heritage objects

    This article discusses the features of technical operation of cultural heritage objects. The relevance of the topic is that cultural heritage objects, like any real estate objects, need constant measures to maintain the working condition, as well as to preserve consumer properties, and this action requires special attention and rational approaches. Guided by the guidelines for the operation of cultural heritage objects of the peoples of the Russian Federation, the owner or other legal owner of the cultural object must comply with the requirements of regulatory documents for the preservation of the object in order to increase its service life. Thanks to a comprehensive approach to improving the method of restoration of objects of historical and architectural significance, it is possible to increase the interest of tourists to cultural objects and ensure their safety.

    Keywords: Object of cultural heritage, operation, operating costs, quality, timeliness, impact, safety, defect, repair, rationality, activities, working condition

  • Modern technology of "panel-monolithic" construction

    The article is devoted to the construction of pre-fabricated monolithic frame buildings made of universal wall panels. The process of building construction is based on the original technology of housing construction, developed by the Turkish company Dahir Insaat, which allows the industrial method to quickly and efficiently build a variety of architectural housing, as well as to comprehensively build up neighborhoods and build new cities

    Keywords: construction technology, prefabricated buildings, panel, monolithic construction, resource saving, column, processing, production, automation

  • Key technologies of the Industry 4.0, Society 5.0, Economy 3.0

    The article analyzes the current state of digital technologies that have a considerable impact on the technological and socio-economic development of industry, society, and the economy. The modern development of the industry in the model of the World Economic Forum (WEF) corresponds to the level of Industry 4.0, the development of society in the Japanese model is appropriate for the stage of Society 5.0, the development of the world economy, as the authors believe, refer to the stage of Economy 3.0. Various sets of technology, such as SMACT, DARQ, the digital technologies of the seventh wave, along with key technologies that have been emphasized by the companies IDC, Accenture, McKinsey, PwC and BCG, are considered. The reports of the US National Intelligence Council, WEF and UN are analyzed. Having studied lots of such documents, the authors proposed the following eight technologies to consider as key ones: Blockchain, Artificial Intelligence, Big Data, Internet of Things, Robots, 3D Printing, Extended Reality and Cloud Technology.

    Keywords: SMACT, DARQ, Blockchain, Artificial Intelligence, Big Data, Internet of Things, Robots, 3D Printing, Extended Reality, Cloud Technology

  • Active water cooling methods for solar photovoltaic module

    Today, photovoltaic systems are widely used, but the tasks of increasing the efficiency and reducing the cost of such systems are still relevant. Among many methods for increasing photoelectric efficiency, the method of active water cooling stands out, the use of which is especially important for Vietnam and other countries with a tropical climate. This article is devoted to the analysis of methods of active water cooling, the analysis of the experimental design of photovoltaic modules and systems, as well as methods to increase efficiency through the use of water cooling.high compared to people's lives. Therefore, it is necessary to study the performance improvement as well as reduce the cost of the photovoltaic system. Among many methods of improving photovoltaic efficiency, active water cooling is quite effective and low cost. This paper focuses on the analysis of active water cooling methods, experimental layout, as well as improved performance when applying cooling.

    Keywords: photoelectric module; water cooling method; active cooling, efficiency

  • Physical and mathematical sciences. Physics

  • Quantum-Chemical Analysis of Microporous Structures Models for Osseointegration»

    hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration.

    Keywords: hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration

  • Temperature dependence of the wetting angle of refrectory metals with Pb-Na melts

    The temperature dependence of the contact angle of wetting allows of Pb-Na of different concentrations on substrates of Co-Cr, Ni-Cr and stainless steel substrate 25X18H9C2 was studied by the method of a lying drop. Measurements were carried out by the method of a lying drop from 359°C to 800°C in an atmosphere of pure helium grade A. It is shown that the value of the wetting angle decreases with increasing temperature, wetting thresholds are observed.

    Keywords: wetting angle polytherms, wetting threshold, Co-Cr, Ni-Cr, 25X18H9C2 substrates

  • Technical science. Informatics, computer facilities and management

  • The solving of vector optimization problems using parallel programming methods

    This article is devoted to an of solving vector optimization problems using modern technologies, namely, the possibilities of parallel programming. The most problems of economic activity are solved by methods of mathematical programming in this modern world. And most of them have a large dimension. The solution of this problems takes a lot of time even when using the powerful computing systems. The purpose of the article is to use all available logical cores of PC processor to solve problems, which will allow access to all the computing power of PC. Much attention is given to a more optimal algoritm for load disribution across thread, which allow to perform several independent actions. The method of solving vector optimization problems is reworked with the use of the algorithm. Thanks to this, it was possible to reduce the time of solving problems by 0.6n times, where n is the number of logical cores.

    Keywords: vector optimization, economic activity, parallel programming, .NET, TPL library, main criterion method, sequential assignment method, target programming methods, multithreading

  • Mathematical model of influence of external recycle on the process of granulation of ammophos in a drum granulator-dryer

    The granulation process of ammophos in a drum granulator-dryer (DGD) is considered. The main factors affecting the granulation process are considered. The inputs and outputs of the mathematical model of the granulation process are determined. A dynamic mathematical model has been developed for the formation of the equivalent diameter of ammophos granules depending on the flow rate and particle size distribution of the external recycle. Graphs of comparison of simulation results with actual data of normal operation are presented. A graph of the dependence of the equivalent diameter of the granules on the flow rate of external recycling is presented. The model is intended to create a system for stabilizing the granulation mode.

    Keywords: ammophos, recycle, granulation, particle size distribution, drum granulator-dryer, modelling, mathematical model

  • Vibrodiagnostics of rod structures using neural network methods of machine learning

    This article explores the use of machine learning methods in vibrodiagnostics. To assess the effectiveness of the use of a neural network, a hypothesis was put forward on the possibility of revealing hidden patterns indicating a defect for structures of the same type with different parameters. The selection of these features by visual analysis of the graphs is difficult due to the large amount of data, which indicates the relevance of solving the classification problem using a neural network. As a result of the study, a fully-connected two-layer neural network was obtained, showing sufficient accuracy of predictions, which confirms the fundamental possibility of using machine learning methods to monitor the state of standard structures.

    Keywords: vibration diagnostics, building construction, building, structure, defect, damage, machine learning, neural network

  • Methodology for increasing the efficiency of managing resource-intensive tasks in distributed computing systems

    Currently, the problem of increasing the efficiency of managing resource-intensive tasks in distributed computing systems is quite acute. Analysis of existing task dispatching algorithms for traditional computing systems showed the limitations of using these methods in heterogeneous systems, as a result of which significant delays can occur between task switching.A functional mathematical model for estimating the workload of distributed computing systems is proposed, based on determining the probability of downtime of the processing center as a criterion for assessing the system load. Using this model will provide increased efficiency in managing resource-intensive tasks in distributed computing systems.

    Keywords: mathematical model, distributed computing system, processing center, loading

  • Development of the method for detecting reference points of aerial images

    In this paper proposed a method based on evaluation characteristics using reference points for cross-linking frames of images obtained from unmanned aerial vehicles. We analyze multi-route (area) aerial photography, which allows you to get images of the area from several parallel routes. The model developed by the authors for detecting reference points of aerial photographs obtained from any type of survey equipment carrier can be used for a wide range of tasks related to the reconstruction of anthropogenic and natural objects and the construction of 3D models for architecture and topography based on digital images.

    Keywords: aerial images, image recognition, reference point detection, photo map, unmanned aerial vehicles

  • Modeling biological structures using electrical equivalent equivalent circuits

    The article discusses several equivalent circuits constructed by sequentially connecting circuits for the membrane and protoplasm. The solution was made using the Cardano formula for cubic equations. The roots in the expression for the determination of resonant frequencies determined the resonant frequencies for the given parameters for the membrane and intercellular fluid; to obtain numerical values, values ​​were used within several permissible limits. In the course of the calculations, it was confirmed that most resonant frequencies are in the millimeter and submillimeter ranges. It is also shown that the cell vibration frequencies occupy the decimeter, centimeter, millimeter and submillimeter wavelengths. Obviously, it is the impact on biological systems of electromagnetic radiation in the indicated wavelength ranges that will be most effective and can lead to a maximum biological response (effect).

    Keywords: equivalent equivalent circuit, biological structure, membrane, oscillatory circuit, Cardano formula, protoplasm, resonant frequencies, electrical processes, equivalent equivalent circuit, electromagnetic radiation

  • Parametric resonance at asymmetric vibrations of the cylindrical shell of the gas-discharge barrel made of a thermoplastic polymer pipe "Furanflex»

    The article presents theoretical calculations and studies of the possibility of parametric oscillations and parametric resonance arising in a polymer self-supporting thermoplastic pipe "Furanflex". Тheoretical calculations of the possibility of asymmetric parametric oscillations and parametric resonance are considered.The Furanflex thermoplastic, polymer liner is offered as a variant of a separate gas exhaust trunk during the reconstruction of boiler rooms and thermal power plants by heat generating companies.The description and calculation of resonant phenomena for asymmetric parametric oscillations are described in detail.Detailed mathematical transformations of differential equations of parametric oscillations are given.The article provides a detailed description and analysis of the occurrence of parametric oscillations. Examples of symmetric and asymmetric parametric oscillations are considered.Information and conclusions of the presented work are intended for a different range of readers, teachers, designers, students of construction specialties.This article should be of interest to utility managers and heat generating companies .

    Keywords: chimney, ventilation duct, repair, restoration of the chimney,protection of the chimney, lining, furanflex, thermoplastic liner,perimetric oscillation

  • The use of the regularization parameter to increase the efficiency of calculating the water flow during distribution along the arms

    The current problems of calculating the distribution of water flow along the branches, in multi-arm river sections are considered, the problems of current calculation methods are identified, a new calculation method is proposed, the proposed method is analyzed for efficiency, a calculation optimization method is proposed, a regularization parameter is proposed, an analysis of the changed formulas is carried out, analysis of the changed formulas is carried out, analysis is carried out calculation errors.

    Keywords: waterways, water expenditures, modeling

  • About Mathematical Modeling of the Multifunctional Air Pressure Probe

    The article is devoted to the mathematical modeling of a multifunctional air pressure probe for avionics systems. The stages of the preparation of mathematical models and their application for the study of the measuring device are considered, the error of the determining the altitude-velocity performance at various angles of attack of the airflow is calculated. Conclusions are drawn on the practical significance of the results obtained and the perspective for the development of mathematical models and their application for the development and study of aviation instruments. ANSYS CFX software was used for modeling and engineering calculations.

    Keywords: air pressure probe, multifunctional air pressure probe, mathematical model of the air pressure probe, mathematical model of the multifunctional air pressure probe, air data system, altimetry, airspeed, angle of attack sensing, angle of sideslip sensing

  • Method for determining the sequential algorithm

    the article describes a variant of setting sequential algorithms in the form of bipartite graphs by further defining them, which makes it possible to work with algorithms using graph theory methods in the future. Two forms of the task are considered: modular and functional-predicative. The possibility of setting the algorithm in table-predicate form is shown. It is concluded that in addition to the generally accepted methods of setting the algorithm, it can be set in matrix-predicate or table-predicate form, which allows using methods of matrix theory and methods of predicate theory when working with algorithms. setting the algorithm in matrix-predicate form avoids isomorphism when performing algebraic and set-theoretic operations on it.; setting algorithms in matrix-predicate form allows you to perform almost any operations on them

    Keywords: graph-algorithm scheme, sequential algorithm, predicative block, functional block, pre-definition, bipartite graph, table-predicative form, graph theory, isomorphism

  • Modeling of triangular-shaped membrane vibrations

    In many modern engineering designs are applied membranes of various shapes. This can be electroacoustic devices, medical equipment, and the skin of the aircraft body with triangular cells. Solutions for free vibrations of rectangular and circular membranes are known by the Fourier method. There are also quite a few solutions to the problems of vibrations of membranes of various shapes by the finite element method. Analytical solutions for membranes of more complex shapes are of great interest due to the complex geometry of the contour and the difficulty of obtaining the solution itself. In this paper, we obtained partial solutions for the problem of free vibrations of a regular triangular membrane with different initial surface bending and found eigenfrequencies of vibrations.

    Keywords: Free vibrations of the membrane, the membrane of the correct triangular shape, natural frequencies of vibrations

  • VAT analysis of bolted joints of thin-walled steel profiles working in tension and compression

    This work is carried out as part of the study of the frame-rod structure with elements of thin-walled profiles. The results of a numerical study of a three-bolt connection of a thin-walled galvanized plate 1.5 mm thick with a plate of 3 mm thick on adjustable voltage bolts are presented. The calculation models are created by volume elements in Ansys software taking into account the strength properties of materials.

    Keywords: galvanized thin-walled profiles, bolted joints, rod structures, thin-walled profiles, finite element method

  • The assessment of the adequacy of the model of a hydroacoustic waveguide with a liquid bottom in the calculation of impulsive sound fields

    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