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  • Reviews, suggestions and discussions

  • Ways to improve the environmental safety of shipping: review

    A promising direction of protection of the atmospheres from the functioning of maritime transport is a method of recirculating part of the exhaust gases from the diesel gas exhaust system to the compressor suction with their intermediate cooling and cleaning in a cyclone-foam apparatus. There is still no method to solve the problem of processing ballast water 100% effective for reliable protection of the hydrosphere. The perspective of the technology of physical and chemical disinfection of ballast with chlorine and ultraviolet radiation in the new developments, with the joint application of such technologies with mechanical filtration, is noted. Development of ballast-less vessels with floating air tanks is underway. The use of external reservoir systems makes it possible not to create internal ballast tanks with pipelines and cleaning systems on ships.

    Keywords: ecological safety, maritime shipping, atmosphere protection, ballast water, hydrosphere protection

  • The device of "green zones" in the conditions of dense building

    The article discusses a new trend of our time-green roof. The types of roof landscaping, their differences and average costs are described. The reasons of alternative replacement of a traditional roof and indisputable advantages of green are explained. The main layers of the "pie" of this roof and the principle of inverted roof, which is becoming increasingly common in the world, as well as its advantages, are considered. The popularity of green roofing in Russia and the opportunity not only to visually improve your home and create a "green corner" without leaving home, but also to reduce heat costs, increase noise insulation and clean the air from harmful impurities.

    Keywords: green roof, extensive landscaping, intensive landscaping, inverted roof principle, minimizing heat loss, economical energy consumption, noise insulation

  • The feasibility of using renewable energy in industrial enterprises

    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

  • Problems of implementing BIM technologies in the construction sector: Overview of scientific publications

    The paper is based on a review of the scientific publications released from May through October 2019, the greater part of which, namely 14 papers, is included in the Web of Science scientometric database. The authors of the papers analyzed explore the construction industry problems over the past 5 years. The foreign studies listed in the reference section were based on the analysis of reviews falling in the above-mentioned timeline. The purpose of this paper is to identify the problems hindering the implementation of BIM technologies in the construction sector, not only in the foreign countries, but also in Russia.

    Keywords: building information modeling, construction organizations, critical problems, external factors, absence of organizational support

  • Application of information technologies in solving the optimization problem of strength calculation of rod elements

    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

  • Analysis of hydraulic and aerodynamic calculations of heating and ventilation systems based on bim-modeling

    Aerodynamic and hydraulic calculations – time-consuming and important steps in the design of engineering systems. There are many different programs for the calculations of heating and ventilation systems. Such as Autodesk REVIT, software, dramatically gaining popularity in the field of BIM-modeling. Design engineers using this software package for the calculations, are faced with the problem of mismatch of diameters, pressure loss between the program and manual calculation. In this regard, it was necessary to understand this problem: compare the calculation results of velocity and pressure losses in the air ducts and pipings in the program REVIT with traditional methods of calculation, find out what formulas calculates this program . The calculations in software Autodesk REVIT have an errors and inaccuracy. Backed by Russian standards, it is necessary will understand how accurate and correct calculations produces software package. The work examines the results hydraulic and aerodynamic calculations, analysises this results with the results of calculations by traditional methods. Calculations in software Autodesk REVIT is applicable for calculating systems of ventilation, but for calculating systems of heating better not to use this program. For the bold use calculations of program is necessary improvement of the software.

    Keywords: BIM-technologies, Building Information Model, Autodesk REVIT, software, BIM-modeling, aerodynamic calculation, hydraulic calculation, system of ventilation, system оf heating, comparative analysis

  • free software. mathematical products

    The article considers the limitations that currently exist in the supply of military Universities with applied proprietary software products necessary for the implementation of relevant educational programs and the organization of scientific work, identifies the most popular software solutions for this category, proposes the closest analogues among free software and criteria for their selection.

    Keywords: mathematical systems, proprietary software, free software, information and educational environment, program selection criteria

  • Physical and mathematical sciences. Physics

  • Structural characterization of carbon nanotubes by means of electronic combination scattering of light

    The work is devoted to the structural characterization of carbon nanotubes by means of electronic combination scattering of light. Samples of double-walled carbon nanotubes with various electronic configurations of the layers have been synthesized, their study has been performed by means of high-resolution transmission electron microscopy, electron diffraction, Rayleigh spectroscopy, as well as spectroscopy of combination scattering of light. The structural characterization of the synthesized nanotubes has been carried out using electronic combination scattering of light, which can play the role of an additional criteria for nanotubes indexing, helping to clarify and verify the obtained results.

    Keywords: carbon nanotubes, catalytic chemical vapor deposition, spectroscopy of combination scattering of light

  • An experimental study of the conductive properties of some liquid biological dispersed media in the EHF range

    The work investigated the behavior of volumetric electrical conductivity (and its components) of various biological liquid media in order to determine the possibility of influencing the processes of life. In the frequency range 0-50 GHz, the following biological liquid media were studied: cold-pressed sunflower oil; sunflower oil obtained using heat treatment; fresh egg yolk and protein; Bacillus amyloliquifaciens bacteria; bacteria Escherichia coli MG1655 pXen-lux. The presence of fluctuations in the dielectric permittivity parameters, the unevenness of the frequency characteristics, in the range of 35-37 GHz, the “bursts” of values ​​characteristic of the resonance nature of this dependence were observed on the frequency characteristics of the loss angle tangents.

    Keywords: biological liquid medium, dielectric constant, complex dielectric constant, loss tangent, medium conductivity, frequency response, fluctuation, frequency range, biophysical parameter

  • Formation of cobalt nanoparticles under the influence of modifying additives

    The article presents the results of studies of cobalt catalysts for the synthesis of hydrocarbons on a silicate support with promoting additives of aluminum, manganese and chromium. The influence of additives on the structural (specific surface area, dispersion of metallic cobalt, size of metal crystallites) and chemical (cobalt reduction degree) properties of catalysts was established.

    Keywords: cobalt, catalysts, hydrocarbon synthesis, structural properties, promoters

  • Technical science. Informatics, computer facilities and management

  • Methodological principles of analysis and synthesis launch-resistors on thermos-dependent polycrystalline resistors

    Launch and control circuit systems built on traditional devices represent complicate multi-link system. Its liability is determined by a number of intermediate devices. Launch jaggedness – is one of the significant flaws, negatively affect on launching process dynamics. Promising direction of launch and control circuits devices are rheostats built on high current semi-conduct polycrystalline thermistors. At the article short analysis of electrotechnical devices launch processes is given. A power engines launch process with thermistor rheostats is considered and formulated a number of limits. Graphic dependences characterizing launch current and rotating moment at direct launch changing and with rheostats on thermistors are given. An example of launch current for asynchronic engine with phase rotor calculating is given as well.

    Keywords: semiconducting thermos-resistance, launch rheostat, launch currents curves, generalized constant, automation.

  • Pure bending of hereditary viscoelastic rectangular plates

    On the basis of the proposed Timoshenko S. P. solution of the problem of pure bending of an elastic rectangular plate under the action of moments of constant intensity acting on its boundary, the theory of bending of viscoelastic plates fixed in the vertices is proposed for the first time. The proposed solution uses the hereditary theory taking into account the hypothesis of N. H. Harutyunyan about the constancy of the coefficient of transverse deformation. For the first time, a method of recalculation of the distributed transverse load applied on the surface of the plate at equivalent moments of constant intensity, time-dependent and applied at the edges, is proposed. For the first time with the help of this theory, the problem of bending a plate pinched at a single angular point distributed by a transverse load is solved. As examples, calculations of rectangular plates under the action of their own weight are given.

    Keywords: roller blade, horizontal mixer, optimization, design, process, material procurement, machining, reduction of production costs

  • Research of interrelation and interaction of processes of the enterprise quality management system in the space of conditions

    For the three main processes of the enterprise, identified in the decomposition of its activities, a mathematical model in the space of conditions is developed, taking into account their relationship and interaction in the quality management system. For the obtained system of differential equations, the structural composition of the operators included in it is disclosed. An example of the application of the created mathematical model in the study of the functioning of the quality management system using linear and non-linear operators and the action of random external disturbances is considered. A discussion of the simulation results at various parameter values from the point of view of the functioning of the selected processes is presented.

    Keywords: differential equation, space of conditions, process, quality management system

  • Survey of monitoring program generation systems

    Systems that allow generating programs for monitoring the state of technical objects are explored. The generation of programs involves the construction of models of objects from the data received from them and the construction of data collection processes. The dependences of the complexity of the generation of models of monitoring objects on the dimension of the input stream, the dimensions of the characteristic vectors describing the state of the elements of the objects of monitoring, as well as the dependences of the complexity of the generation of data collection processes on the number of structural levels of objects, the number of information elements on each level, and the probabilities of generating processes on each of the levels. Based on the results obtained, recommendations are formulated on the use of monitoring program generation systems in solving practical problems in particular domain: recommendation on selecting right balance between often and rare model rebuilding and expediency criteria of the monitoring process generation system usage.

    Keywords: complex technical object, monitoring, program generation

  • Cognitive model within and inter-regional migration processes: the structure of factors of direct and reverse action (on the example of the Rostov region)

    Based on the cognitive methodology, the article considers the factors within and inter-regional migration process in the conditions of the regional community on the example of the Rostov region. Using the method of cognitive maps, the main factors of two forms of migration are visualized from the perspective of a systemic and structural approach. The structure of direct and reverse action factors that enhance / weaken the influence of structural and institutional elements on the processes of population displacement, their adaptation to new social conditions and integration into the host community is presented. Conclusions are made about the dominant factors of direct and reverse influence on the process of intra-regional (socio-economic, geographical, demographic) and inter-regional migration in the region (socio-psychological state of the population, the level of consolidation of the regional community, the activities of regional executive bodies).

    Keywords: cognitive model, cognitive map, migration process, regional migration, interregional migration, direct action factors, reverse action factors, Rostov Region

  • The control system of technical state of technological mechatronic objects using neural network of state analysis

    The article presents a system for monitoring the technical condition of technological mechatronic objects using a neural network of state analysis. The aim of the work is to increase the reliability of the equipment, reduce the number of sudden failures and emergencies by assessing the dynamic state of the spindle unit of the mechatronic technological object. A method for diagnosing the state of the spindle unit of a mechatronic object using a neural network based on the time domain features of vibration signals is proposed and applied. The structure of the neurosystem is proposed. The data obtained during practical tests, as well as the structure of the neural network for diagnosing the state of technological mechatronic objects, are presented.

    Keywords: state control, mechatronic object, neural network, spindle unit, vibration signal, time domain features

  • Study of the processing of external spherical surfaces

    The article describes in detail the algorithm for constructing a mathematical model that allows you to describe the process of processing a spherical surface, provides an analysis of the change in the radius of the cutter, which allows you to choose the optimal cutting conditions and create conditions for automation of the process.

    Keywords: Software, process automation, spherical surface, spherical surface treatment.

  • Methodical bases for automation of a engineer workplace of transport in the conditions of the North

    The article deals with the reducing issues the time spent of making informed decisions by automating the workplace of a transport engineer on the basis of the development and use of methods for selecting and calculating the number of vehicles for servicing remote objects. A specific example based on the transport service of electric power facilities, which can be implemented in any software of the organization, is considered

    Keywords: Workplace automation, transport operation engineer, transport service, electric power facility, calculation of the number of vehicles.

  • Network traffic in WINDOWS operating systems: comparison and analysis of its generation

    The article analyzes network traffic in WINDOWS operating systems, as well as a description of its tools to identify a certain redundancy of network activity. The authors also conduct a comparative analysis of the most common software products that perform the functions of monitoring network traffic.

    Keywords: operating system, detection systems, network protocol, network traffic analysis, networks, sniffer, traffic, network activity

  • Clarifying the criteria for the application of an automated anti-freezing system on contact network wires

    The increasing load on the power supply system of electrified railways leads to higher requirements for reliability of power supply. Clarifying the criteria for the operation of the automated system to combat ice formation on the wires of traction power supply to railways in difficult weather conditions is an urgent task aimed at improving the reliability of uninterrupted power supply of rolling stock

    Keywords: ice melting, calculated coefficients, selection of optimal parameters, traction power supply system

  • Using dynamic programming to increase the energy efficiency of hybrid vehicles

    The trend of the transition of autonomous vehicles from internal combustion engines to electric drives leads to the need to find intermediate solutions. Hybrid transport is currently a fairly popular compromise. Improving its energy efficiency is possible in several ways. This article shows a software method based on dynamic programming, which allows you to optimize fuel consumption by separating the use of an internal combustion engine and an electric drive. Dynamic programming solves recursive optimization problems when sub-tasks are recounted several times. Also, in this work, mathematical modeling of the car’s movement pattern and determination of the optimal distribution of speed and battery charge depending on the number of fractional bits are carried out. The development of dynamic programming from the point of view of hardware implementation is possible using Field-Programmable Gate Array (FPGA).

    Keywords: Hybrid transport, mathematical modeling, dynamic programming, programmable logic integrated circuits, internal combustion engine, electric drive

  • Evaluation of empirical models of centimeter and millimeter radio wave propagation in forests

    This article concentrates on the issues of radio wave propagation in forest conditions. The issue of representing the forest mass as a heterogeneous structure with a low dielectric constant is considered. Calculation and comparison of radio signal attenuation using several empirical models were carried out. It is shown that empirical models take into account the heterogeneous structure of the forest when moving from free space to the forest.

    Keywords: radiowave propagation, wooded area, empirical model, radiowave attenuation, path loss, ground mobile communication, electrodynamic characteristics of a heterogeneous structure