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  • Reviews, suggestions and discussions

  • The strength of reduced and strengthen reinforced concrete for cover plates

    The method of plasma treatment of concrete's fillers, that increasing service properties building materials. We have studied influence different industrial repair cement compositions to the strength of reduced and strengthen reinforced concrete for cover plates for civil engineering. This was shown, that external reinforcing of repaired layers by carbon fiber networks increase significantly their load-carrying capacity. Using epoxy-based covering mortar is the most efficiency.

    Keywords: internal reinforcement, low temperature plasma, composite materials, building cover plate

  • Calculation of the dose of mineral coagulant for water purification by the method of concentrated coagulation

    The method of calculating the coagulant dose using the technology of concentrated coagulation with the addition of air is given. The paper considers the peculiarities of using aluminum sulphate and aluminum polyoxychloride as a coagulant in different periods of the year, taking into account seasonal changes in water quality. Recommended values of parameters used in calculations of the coagulant dose during the year are given. The refined method of calculating the coagulant dose allows determining the weight dose of the reagent, including the mixed coagulant, taking into account the required air saturation of water, as well as the optimal volume of the so-called auxiliary water flow sent for concentrated coagulation.

    Keywords: coagulant dose, aluminum sulphate, aluminum polyoxychloride, air saturation, concentrated coagulation, auxiliary flow, mixed coagulant

  • Improvement of the construction process with the use of BIM-technologies

    Questions of accounting of actors of influence on the investment and construction cycle are raised. An example of the use of BIM-technologies in construction is considered. It describes the solution of some specific problems that arise when maintaining the quality of construction of complex buildings, taking into account the possibility of introducing modern information systems, attention is paid to the peculiarities of improving the quality of work performed.

    Keywords: organization of construction; quality of design, quality of construction and installation works, BIM-technology

  • Research of the world experience in using renewable energy sources

    In the modern world, the question of using alternative energy sources is very acute, since mineral reserves can run out and the environmental damage from their use and processing is much greater than from renewable energy sources. Therefore, in the modern world, the use of renewable energy is gaining momentum.

    Keywords: renewable energy sources, ecoenergy

  • Digital support for collective discussions using a mobile application

    This article analyzes the sphere of the organization of business collective discussions and identifies key problems in this area, as well as proposes a new method for increasing communication efficiency through the use of special software.

    Keywords: networking, collective discussion, communication effectiveness, networking organization, networking app

  • RDF as an alternative energy source

    The article deals with obtaining RDF fuel based on solid municipal waste. The expediency of using this type of fuel in the cement industry is justified, since its combustion in cement furnaces has less impact on the environment due to the high temperature level of the process. The composition of RDF fuel by elements is analyzed. Due to the fact that this fuel from different sources has a difference in the heat of combustion of two times or more, the heat of combustion of RDF fuel for the middle zone of Russia was experimentally determined and its compliance with GOST R 55127-2012.

    Keywords: solid municipal waste, MSW, Recycle Derived Fuel, RDF fuel, lower combustion heat, ash content, alternative energy source, colorimetric bomb

  • Physical and mathematical sciences. Physics

  • Intraband optical absorption induced by Rashba spin-orbit coupling in two-dimensional electron gas

    Semiconductor heterostructures in which the spin-orbit interaction is associated with the absence of a center of symmetry that limits the potential of the structure are the basis for future spintronics devices. One of the main methods for investigating into spin properties is the study of optical phenomena in magnetic fields. The article theoretically consider the effect of spin-orbit interaction on absorption in quantum wells, in particular, the intraband magnetic absorption of electromagnetic radiation of linear polarization by a two-dimensional electron gas with Rashba spin-orbit interaction. The coefficient of light absorption by free carriers in the quasi-two-dimensional system was calculated in the second order of perturbation theory. It is assumed that infrared electromagnetic radiation is absorbed in a quasi-two-dimensional system by free carriers, that are scattered by optical, piezoelectric, and acoustic lattice vibrations. The quantum-mechanical motion of an electron in a two-dimensional system in a constant uniform perpendicular magnetic field is described by the Hamiltonian taking into account the Rashba spin-orbit interaction and Zeeman splitting. We calculated the light absorption spectra of 2D electron gas for GaAs / In0.23Ga0.77As lattice structures.

    Keywords: Rashba spin-orbit coupling, intraband magnetoabsorption, quasi-two-dimensional electron system, magnetic field, Landau levels, Zeeman splitting, wave functions

  • Technical science. Informatics, computer facilities and management

  • Analysis of the object-oriented paradigm implementation in the open source projects

    The article describes the specifics of OOP concepts implementation in the open source projects that contain address book model in comparison to OASIS UBL Party Reference model. The open source software analysis is performed using the formal criteria for evaluating the matching between open source project models and reference model based on quantitative characteristics, conceptual graph transformation and cluster analysis. First, the scope coverage, elaboration factor and structural connectedness were calculated based on model parameters. Second, the domain models were represented as conceptual graphs and they were compared based on semantic equivalence. And third, the model was clustered into four subdomains, and quantitative characteistics were evaluated separately for each cluster. Based on the experimental results of model analysis the authors propose methods to reduce the conceptual mismatch between reference model and project models.

    Keywords: OOP, semantic analysis, reference model, OASIS UBL, conceptual graph, cluster analysis

  • Simulation of the design activity diversification of innovative enterprise

    A new closed solution of the related dynamic problem of thermoelastic for a long cylinder in case of temperature change on its faces (boundary conditions of the 1st kind) has been built. The mathematical formulation of the problem in question includes linear equations of motion and thermal conductivity relative to the radial component of the displacement vector, as well as functions of temperature field change. To solve the problem, a mathematical apparatus is used to separate variables in the form of a generalized final integral transformation (instrument). The constructed design ratios make it possible to determine the stress-deformed state and temperature field of the elastic element under arbitrary temperature external influence. The influence of the rate of change of load and physical properties of the material on the inertial properties of the elastic system has been analyzed, as well as the parameters at which it is necessary to take into account the connectivity of mechanical and temperature fields have been determined.

    Keywords: Long cylinder, associated thermoelastic problem, transient temperature impact, final integral transformations

  • Single Sign On Technology: Central Authentication Tools for a Functional Service System

    This article discusses the problem of network authentication of a client when a functional web-system consists of various services, each of which is represented by a separate site. Particular attention is paid to Single Sign On technology - a single entry point as a way to achieve centralized authentication. A comparison of tools that provide a single input is given, and a conclusion is made about the best of them. Based on the research, the author proposes the Gluu single entry point server as a server that satisfies all the requirements of the functional service system presented in the example, and also able to work within the framework of popular authentication protocols.

    Keywords: functional service system, authentication, authentication protocol, single entry point, single entry point server, comparative analysis

  • Automatic localization of topology errors during batch import of GIS data

    Data integration between different geographic information systems can be achieved with the interchange by the open data formats. GIS data of an area spatial type being batch-exported from the interchange files require a waste amount of manual work aimed on exploring each erroneous spatial object for all of it's topology errors. The algorythmic solution for automatic localization of topology errors is proposed, it's novelty and the enhancement potential are described.

    Keywords: urban planning, thematic map, geographic information system, ObjectLand, data integration, interchange format, error reason, incorrect polygonal object, planar points' clusterization, K-medoid

  • Verification of the electronic model of the thermal network by "equivalent absolute roughness"

    The article substantiated the need to create electronic models of heating systems using BIM and GIS technologies. It is indicated that the original model data is needed correctly. The theoretical basis for determining the specific drop in pressure in thermal networks is given and its functional dependence on the size of the equivalent absolute roughness of the pipeline walls is established. The dependence of the change in the equivalent absolute roughness on the life of the pipeline is given. References to literature containing the most complete base of values equivalent to absolute roughness are given. A combined hydrometric graph of the hydraulic heating system modes at different values of the equivalent absolute roughness is given. Recommendations for verification of the electronic model have been given.

    Keywords: electronic model, hydraulic mode, pressure drop, heat carrier, hydraulic friction factor, equivalent to absolute roughness, verification

  • Estimation of the time factor in technical systems on the example of manufacturing products of heavy and nuclear engineering

    In this paper, the time of manufacturing of nuclear industry products is estimated depending on the complexity of technological operations, the time to justify the choice of manufacturing options, and the performance of mandatory research and development work . The time factor as an element of the system of technical progress is presented on the practical example of replacing heavy Metalworking equipment with mobile small -sized units.

    Keywords: time factor estimation, shell, steam generator, roller stands

  • Automation of evaluation of operator training efficiency on computer simulators using statistical methods

    "The article is devoted to solving the problem in the field of development of methods and means of automation of evaluation of training efficiency on computer simulators, which are used for the training of operators of production processes. Approaches to assessing the effectiveness of training are given in many scientific studies on the creation and application of computer simulators. However, the problem of automation of the process of this assessment on the basis of the simulators themselves is not sufficiently considered. The evaluation methodology (based on mathematical statistics methods) and the prototype subsystem of the computer simulator complex were proposed to solve the indicated problem. They reduce the effort of the expert responsible for performance evaluation. Output results can be used for training operators in educational organizations. The reported study was funded by RFBR according to the research project № 18-38-00835. "

    Keywords: computer simulator, mathematical statistics methods, efficiency of training process, automation of training process

  • Conceptual Framework for Integrated Modelling of a Holistic Engineering System

    Interdisciplinary is a fundamental category of functioning of all systems of modern science, it is achieved through convergence and becomes a new form of educational environment. The article presents the conceptual foundations of complex modeling of a holistic system of training of a specialist of an engineering university, updating interdisciplinary requirements to educational results. The methodology of the system approach, which allowed to develop a universal algorithm of disciplinary synthesis of all training cycles, was chosen as the national scientific basis of the study. As a result of solving the problem of functional adaptation of the educational model, an information model of interdisciplinary connections is formed on the basis of integrative parameters. As a didactic product of interdisciplinary integration are interdisciplinary cycle complexes, the algorithm of functioning of which is controlled by the methodology of construction and development of the general phylosophical category "scientific picture of the world." It has been shown that the inclusion of methodological bases of this category in the process of organizing the integrity of the engineer 's training provides forms of synthesis of scientific knowledge at all levels of the educational environment - internal, interdisciplinary and transdectoral. In this way the idea of convergence of the content of education as a means of increasing the level of integration is realized, which directly correlates with the fundamental goal of engineering training - formation of a holistic worldview and scientific outlook of the future specialist. An example of methodological organization of the educational process of the engineering university within the framework of the interdisciplinary approach is given.

    Keywords: educational model, design algorithm, system modeling strategy, functional model adaptation, control algorithms, interdisciplinary, knowledge convergence levels

  • Features of multi-channel signal processing with a quasiring arrangement of receiving elements

    Issues related to the features of multi-channel signal processing based on superresolution methods using a system with a quasi-ring arrangement of receivers are considered. The output characteristic is compared using the classical processing method (radiation pattern is formed) and the superresolution method (direction-finding relief is formed). As a basis of the signal processing algorithm, the property of 2π-periodicity of the angular dependence of the directivity characteristics of the receivers and the signal power is used. The issues of increasing the resolution in the angular direction of the received signals were studied during multichannel processing in a receiver system with a ring arrangement. The possibility of a significant improvement in resolution during the transition from the classical method to the method of superresolution is shown.

    Keywords: multichannel processing, radiation patterns, Hamiltonian cycle, angular distribution, annular and quasi-ring antenna array, directivity characteristics, synthesis of amplitude-phase distribution

  • Simulation of manifold penetration under the active motorway

    The article deals with the issue of modeling by the finite element method of the penetration of the communication tunnel under the operating multi-lane highway demand microtonneling, horizontal directed drilling and construction under the protection of the screen from pipes

    Keywords: Tunnel, collector, finite element method, microtonneling, horizontal directional drilling, motorway, case, reinforced concrete, metal pipes, settling mule

  • On the issue of calculating the reinforcement in the junction of a beamless monolithic plate with a column

    The article discusses the results of the calculation of reinforcement in monolithic reinforced concrete floors. The subject of the study is the reinforcement of the slab section located next to the column. The study was carried out by setting up a computational experiment. Modeling was performed in software systems: Revit, Sapphire and Lira-CAD. Finite element models were calculated in Lira-CAD software. A total of 7 series of samples were calculated. The samples are a fragment of a monolithic reinforced concrete floor of a civil building. Investigated factors: triangulation parameters; the presence or absence of absolutely rigid bodies in the node. The authors performed a comparative analysis of the results of a computational experiment. It was found that for the most correct and economical selection of reinforcement in models without the use of AFL, it is desirable to take the triangulation step in the slab equal to the side of the column section or more than this value by no more than 15%, since an increase in the size of the finite elements leads to an underestimation of the reference moment and the resulting area calculation longitudinal working reinforcement. With this approach, the value of the maximum moment, and, therefore, the area obtained by the calculation of the reinforcement will be 6% higher, which makes it more preferable, although it increases the complexity of creating a finite element circuit.

    Keywords: BIM technology, reinforced concrete, girder-free overlap, reinforcement, triangulation, finite element, reinforcement selection, computational experiment, Rewit, Sapphire, Lira-CAD

  • Technical science. Building and architecture

  • Assessment of the bearing capacity of a metal truss: analysis of the results of field tests

    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

  • Experimental data on the softening of the soil of the base of the experimental pit over time

    The article presents experimental data on changes in the stress-strain state of the soil of the base of the experimental pit. The research was carried out in the Moscow region, an extended pit had a depth of 4 meters. The excavation of pit was carried out mainly in clay loams which had various consistencies. During the experiment, the required number of benchmarks, surface grades and pressure sensors was established. The main issues of the in-situ research were to obtain data on the change in the natural stress state as a result of excavation of the foundation pit over time, on the patterns of soil deformation along the depth of the foundation pit and of the sides and, accordingly, on the development of an active zone of redistribution of initial stresses. The results of deformations of the day surface of the foundation pit were obtained and analyzed, the character of the change in deformations along the depth of the foundation pit was studied. As the research had been continued for 2.5 months, the necessary conclusions about the features of the development of the deformation of the foundation pit over time were made.

    Keywords: foundation pit, experimental research, patterns of deformation, stress state, active zone

  • Features of problems of quality of design and construction of high-rise buildings

    The main problems arising in maintaining the quality of design and construction of high-rise buildings with the possibility of introducing modern information systems are considered, attention is paid to the peculiarities of improving the quality of work performed at all stages of the life cycle of the investment and construction project.

    Keywords: organization of construction; quality of design, quality of construction and installation works, project life cycle, high-rise buildings and structures