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  • Reviews, suggestions and discussions

  • Environmental additive technologies in construction: review

    This article presents an analysis of promising areas of development of the construction market by region. One of the most environmentally friendly and practical 3D printing methods using additive building technology is considered, the problem of environmental pollution is touched upon, alternatives to traditional building materials are proposed through the processing of agricultural and construction waste products and their subsequent use in building printing. The advantages of using this method during construction in emergency situations and in adverse climatic conditions are highlighted. The Gaia experiment, a printed eco-house, is presented.

    Keywords: additive technologies, 3D printing, 3D printer, construction industry, construction

  • Comparative analysis of modern software for nonlinear analysis: review

    This work outlines software packages that are capable of dealing with nonlinearity of the analyzing structure. Brief introduction of the software and its beginning in the history. Also explained the difference of linear and nonlinear analysis performed on the structure. Defined which software packages are for media and analyzing problem (structure). Similarly, descriptive study was done to understand advantages and disadvantages of main analyzing tools ANSYS, ABAQUS, SOLIDWORKS. In addition, the work looked into which one of the mentioned tools have its own distinguish functions. Finally, the results data of all three software were compared with each other.

    Keywords: nonlinear analysis, numerical analysis, ANSYS, ABAQUS, SOLIDWORKS

  • Using the thermal imaging method to examine buildings and structures: review

    Thermal imaging technology has become one of the most valuable diagnostic tools for inspecting and inspecting buildings and structures. This article describes the features of this method, the history of its creation, the basic principles of thermal imaging cameras. The authors of the article show the scope of thermal imaging technologies and their place in the construction industry. This article describes in detail both the positive aspects of thermal imaging technologies and their shortcomings. The authors concluded that thermal imaging cameras are a universal tool, and new innovative ways to use them have become a key technology for construction inspection work around the world.

    Keywords: thermal imager, thermography, thermal imaging device, building inspection, reconstruction, energy audit, construction diagnostics, thermal imaging

  • Judicial value examination as a tool for resolving a dispute about the value of the original value of the pledged property

    To date, the socio-economic situation in the country creates for the population quite significant obstacles in the implementation of tasks for the purchase of housing and other real estate through mortgage lending. However, when it comes to collecting the amounts owed on the loan, banks are faced with an analysis of the prospects for the sale of mortgaged property, as a result of which, in most cases, come to the conclusion that the original sale price of the mortgaged property with the realities of the market. In the article, the authors consider the judicial practice of determining the initial price of the mortgaged property and analyze the situation in which there is a need for judicial value examination, as well as give the main aspects of the methodology of this type of expertise. The purpose of the article is to form a clear idea of the reader about the process of resolving the dispute arising from the breach of obligations under the loan agreement.

    Keywords: expert, forensic examination, subject of pledge, cost examination, assessment report, methodology

  • The requirements to sorbents for collecting oveflows and leaks of oil product in urban environment

    It is accepted to use sand and sawdust at overflows and leaks of oil products in urban environment. It is allowed to use sorbents. Existing requirements to sorbents which are used for collecting oil and oil products were analyzed on the basis of normative-technical documentation and scientific publications in the article. The necessity of modification and addition of the existing requirements was revealed. The requirements to sorbents for collecting overflows and leaks of oil products in the urban environment were developed.

    Keywords: sorbents, requirements to sorbents, collecting, oil product, product, overflow, leak, urban environment

  • The main aspects of the methodology of the judicial construction and technical expertise

    Conducting judicial construction and technical expertise, must comply with certain procedures and rules. The article systematizes the main tasks of the examination; determined the purpose of its implementation; describes how to conduct a hearing; The authors revealed the fact that the expert is criminally responsible for the opinion provided.

    Keywords: judicial construction and technical expertise, expert-builder, regulatory documentation, regulations of the construction, field test, expert opinion, executive documentation, quality of construction work, regulation of the hearing

  • The use of modern building materials and technologies in the device roofs

    One of the most complex structural elements of the building is the roof. It protects the building from the external environment: precipitation, temperature changes, solar radiation, wind effects, as well as from air pollution. The main element of the roof is the roof, as the condition of the roofing depends on the condition of the other elements of the roof and in this article will be considered modern building materials used in the device of roofs.

    Keywords: roofing, roof, modern roofing, metal, profiled flooring, Ondulin, membranes, slate, tile

  • Physical and mathematical sciences. Physics

  • Spectrum density of the first zone of linear coupled oscillators Part II

    The aim of this work is to estimate the density of the electron spectrum of objects with a dispersion bond, such as liquid helium, for example. The interest in its electronic properties is caused by the recently discovered dynamic polarization in the second sound wave, which made the study of its zone structure relevant. In this paper, the objects under study are modeled after born by a linear chain of coupled oscillators. The dispersion bond is considered on the basis of the quasi-classical London approximation, which takes into account the correlations of the oscillating dipole moments of atoms. The first part of the work is preparatory. A brief review of the new experimental data for helium II is given, and the problem statement is formulated. On simple examples (lines of two and three coupled oscillators) the research methodology is worked out. This section is of independent importance for rapid estimates of the density of the electron spectrum in dispersion coupling, and identifies trends in the change of spectrum parameters with an increase in the number of structural units. It is obtained, in particular, that the band width increases and the specific binding energy decreases slightly. In the second part, a long chain of coupled oscillators is investigated on the basis of the developed techniques. The density of the electron spectrum is calculated both for specific chains and in the thermodynamic limit. The results obtained in this work are planned to be used in the future for the development of dynamic polarization models for helium II

    Keywords: dispersion forces, helium II, dipole moment, harmonic oscillator, coupled oscillations, normal mode, electron spectrum, density, narrow band, binding energy

  • Technical science. Informatics, computer facilities and management

  • Modeling special aspects of wood density changing in the longitudinal direction of the tree trunk in the calculation of the weight of the cargo transported by the forest machine

    Justification of the parameters and compiling of the forest machine chassis can not be performed without determining the weight of the load. The weight of the load depends on the wood density. The wood density within the growing tree is heterogeneous. The aim of this study is to develop mathematical models to calculate the average density of the tree trunk area depending on its location in the trunk. The research is based on the construction of approximating dependences of changes in the average wood density in the longitudinal direction of the trunk by minimum deviation method. The obtained mathematical models establish the relationship of density changes in the longitudinal direction of the trunk for four forest-forming species of the Republic of Karelia: pine, spruce, birch and aspen.

    Keywords: modeling, wood density, logging, skidding, forwarder, skidder

  • Checking the adequacy of mathematical models thermal power facilities

    The work is devoted to the development of an adequate model of a steam drum unit that will allow the development of an optimal control algorithm. The causal relationships of the boiler unit were considered and their transfer functions were given. Mathematical models of the steam drum boiler experimental, based on the removal of the acceleration curves, and the combined methods were also obtained.

    Keywords: analysis of control algorithms, adequate models, mathematical models

  • Mathematical models of performance, reliability and operating costs of a system for storing deduplicated data on SSD disks

    The article is devoted to the development of a complex of mathematical models describing the functioning of a data storage system based on solid-state drives using deduplication technology. The mathematical model of the user application generates a load on the system as a stream of requests, randomly sized according to the Pareto law, and with random time interval between requests. Requests are received at the input of the storage system into the network service model, then to the VDO deduplication system model, then to the software RAID model and, finally, to the solid-state drive model for read/write operation. Due to the nature of SSDs, system performance in read and write modes is modeled separately, taking into account the different speed characteristics of RAID-5, RAID-6 and RAID-10 arrays. The mathematical model of the reliability of each RAID array is based on the Kolmogorov-Chapman system of equations for calculating stationary probabilities describing transitions between states in a discrete Markov chain. The durability of the system is determined through the model for assessing the exhaustion of the recording resource of solid-state drives. The mathematical model for estimating the storage cost includes the costs of equipment, resources and maintenance over the entire operation period of the system. The final result is a mathematical formulation of the problem of data storage system optimal design, which allows selecting the system architecture and parameters that are optimal in terms of a combination of factors – reliability, speed and cost of data storage.

    Keywords: mathematical modeling, data storage system, performance, reliability, solid state drives, RAID array, optimization

  • Network Planning in Road Construction

    The article discusses the method of network planning in road construction as a method of rational resource planning. The calculation of the main indicators of the network graph such as the early start of work, the late start of work, the calculation of the critical path as the probable time of the construction duration is given. Analysis of the network schedule allows you to identify the time reserve for reducing construction time by a reasonable redistribution of resources and equipment. The results of this study will allow at the planning stage to analyze the data and choose the most optimal option for construction from the position of the correct distribution of resources and equipment, as well as their savings. At the stage of construction, it will allow you to monitor and control the progress of construction work, thereby monitoring the flow of funds and achieve savings or the optimal amount of construction without risks. Also, the results of the study will allow, without critical changes, to reduce construction time without changing the sequence of construction technology and without increasing mechanisms and labor costs. Subsequently, the results of the study can serve as the basis for developing a mechanism for optimizing network schedules from the position of the redistribution of teams to carry out construction work, as well as a reasonable combination of works that use the same type of mechanisms.

    Keywords: road construction, network planning, earlier start of work, late start of work, critical path, resource management, construction duration

  • “Internet of Things” network control element for rtmote identification of radio tags

    This article discusses such technology as the Internet of Things and the network control system for remote identification of RFID tags. In the course of the work, the most popular microcontrollers to date were considered, a comparative characteristic was carried out, and the efficiency of use was evaluated, during which the most optimal option for further work was selected. As a result, a system for remote identification of RFID tags was developed, namely, the design of the system and application software, with the ability to obtain information on RFID tags from both PC and smartphones, and the results of use on different operating systems are presented.

    Keywords: Internet of Things, microcontroller, NFC module, Arduino, protocol, MQTT, RFID tag, software, data transmission, identification

  • Mathematical modeling in image reconstruction by projections

    The paper studies a mathematical model of a function that can be restored by integrals. In order to reduce image distortion during reconstruction, the representation of the desired function in the form of a sum of Gauss functions is proposed. A software package has been developed to study the model. The parameters and type of the grid giving the smallest error in this model are determined.

    Keywords: mathematical modeling, inverse problem, Radon transform, image reconstruction, Gauss function, computed tomography

  • Modeling of the low-pass filter

    Results of modeling and a pilot study of a low-pass filter with a cut-off frequency of 4 GHz are given. Modeling of the filter was carried out in MicrowaveOffice application program package. The experiment was made on the vector analyzer of RXA chains. Results of modeling and an experiment conform to the imposed requirements, namely: - cut-off frequency is 4 GHz; - losses in bandwidth no more than 3 dB; - an obstacle on the second harmonic of cut-off frequency not less than 60 dB; - wave resistance of an input and exit of 50 Ohms.

    Keywords: low-pass filter; cut-off frequency; losses in bandwidth; losses in an obstacle band; modeling; experiment

  • Comparative analysis of conflicts of the Soviet and modern youth space using cognitive modeling

    The article is devoted to the analysis of issues related to conflict interaction in the youth environment of Soviet and Russian society. The aim of the study is to build a cognitive map of the model of the system “Conflict control (youth of the USSR)  conflict control (youth of Russia)”. The authors note that at present there is an urgent need to identify existing conflict situations in the youth environment of Russian society and at the same time it is logical to conduct an analysis based on a study of past years and those problems that were the cause of conflict situations in the youth environment in Soviet times. It is also noted that in modern social practices it is necessary to create effective mechanisms for countering conflicts, aimed primarily at reducing the level of risk in the modern youth environment. The methodological basis of the study. The research methodology is based on the principles of scientific research, as the principle of holism and the principle of objectivism. The work used the methods of systematic and comparative scientific research. Conclusions: in spite of the fact that it is not feasible to fully show all the questions outlined in the framework of one study (a similar goal was not set), the analysis of the processes associated with the study of conflitogenicity in the modern youth environment and the constructed cognitive model are of certain theoretical interest and require further work in the framework of this issue.

    Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

  • Modeling of diffusion saturation of austenite with carbon, taking into account the temperature in the cementation process

    Cementation studies focus almost exclusively on the movement of carbon, described through the diffusion equations, often with constant coefficients and without regard to temperature. This approach does not allow, to take into account the further diffusion of carbon into the workpiece in a lower temperature range at the stage preceding quenching. The paper describes the modeling of the diffusion saturation of steel by carbon in the cementation process, taking into account the influence of temperature on the example of a numerical solution of the gear cementation problem using the COMSOL Multiphysics program. It was shown that the finite element mathematical calculation of the process of saturation of austenite with carbon during cementation gives good agreement with experimental data, and finite element analysis methods can be used for multivariate calculation of the carbon content in austenite after diffusion saturation

    Keywords: carbon diffusion, carburization, COMSOL Multiphysics, numerical modeling, carbon distribution, carburization, Fick diffusion law, mass transfer, heat transfer, gear, finite element method

  • Double-contour geodesic shells with pentahedral pyramids

    Geodesic domes are self-supporting spatial structures without additional supports. Geodesic lines are used when breakdown geodesic shells into elements. In this area, the development of geometric models of double-contour geodesic shells are performed. The features of these works are the use of trihedral and hexagonal pyramidal structures as the first contour. However, for the formation of such structures, pentahedral pyramids can also be used. The aim of the study is to develop a method, algorithm and software for a double-contour geodesic shell with pentahedral pyramids. To achieve this goal, the principle of duality, methods of analytical geometry in space and programming in the GDL language built into ArchiCAD were applied. As a result, a parametric ArchiCAD object of a two-contour geodesic shell with pentahedral pyramids was developed. It can be used in architectural and structural design of unique buildings.

    Keywords: geodesic dome, double-contour geodesic shell, duality principle, parametric ArchiCAD object, the programming language of GDL

  • Features of automation of the flame detection process by video sequence in the oil and gas industry

    In this paper we propose an algorithm for recognition of the flame on the video sequence. The subject area is the oil and gas industry and its features in the framework of the problem. The current technical means for fire detection are described, the restrictions in their application are characterized. Various approaches to flame recognition on video sequences are mentioned, as well as the need for their joint use to create a reliable model for recognition of the flame on he pictures of video stream.

    Keywords: artificial intelligence, fire safety, automation, color mask, Haar cascade, morphological erosion, oil and gas industry, flame recognition, fire automation, video sequence, each-frame analysis

  • Development and research of position-trajectorial controller for underwater glider motion control

    This article reviews the process of glider motion control system development based on position-trajectorial controller, developed by V.Pshikhopov. A mathematical model of an underwater glider is reviewed briefly, this model uses variable buoyancy for movement. Control system uses position-trajectorial controller which uses two controll variables for straight gliding and turning. The article contains results of modelling the motion control system in various modes such as straight gliding, gliding with turning and following a set of points. A brief description of practical usage of the control system is given.

    Keywords: glider, control system, position-trajectorial controller, motion control, mathematical modelling

  • Deposition electroaerosols jet in the vegetable layer

    The article deals with the issues of plant protection by electroaerosols of chemicals. Revealed General regularities of penetration electroaerosols jet in the topsoil and deposition of drops of electroaerosol in vegetable elements. The estimation of the depth of penetration of the aerosol jet into the plant layer and the intensity of deposition of the aerosol on the protected plants is given. This article is of interest to a wide range of readers dealing with the issues of electrical aerosol treatments in agriculture.

    Keywords: electroaerosol, the jet flow of the electrical aerosol, aerodynamics jet stream, plant protection, plant layer, the charge drops electroaerosol, gravitational and electrostatic precipitation

  • Experimental methodical georadar studies of lead-zinc deposits

    This study investigates possibilities for identifying additional deposits of polymetallic ores based on geophysical studies that use ground-penetrating radar (georadar). Such studies can render a deposit significantly more attractive from an economic standpoint. Experimental methodological work was carried out to compare the geological data of preliminary exploration and georadar exploration with GROT 12 georadars.

    Keywords: ground-penetrating radar, radargram, geological section, profile, anomaly, ore body, exploration, video pulses