bluuebunny/crossref_metadata_2025_split huggingface dataset:
Regularities of deformation of the bending of elastic elements and the parameters of vibrations of a dynamic tillage operating part
Authors: Dzhabborov N , Sergeev A , Zakharov A , Perekopskiy A 
Published: December 2020

Abstract
Revealing the regularities of bending deformation of elastic elements and vibration parameters of dynamic tillage operating parts is an urgent task, as it ensures the development of new innovative energy-efficient operating parts The aim of the study is to identify the patterns of deformation of elastic elements and oscillations of the wing of a dynamic tillage part of the operating part. The object of research is a dynamic arrow-shaped tillage operating part with a working width of 330 mm for surface tillage to a depth of 14 cm. The subject of research is the regularities of the bending deformation of elastic elements and the vibration parameters of dynamic tillage operating parts. The research was carried out using methods of mathematical modeling based on the study of physical laws that occur during soil cultivation; experimental studies on energy assessment of tillage operating part, analysis and generalization of experimental data. The scientific novelty of the work is represented by empirical dependencies for determining the value of the deflection of an elastic element, displacement of the extreme point of the wing and the amplitude of oscillations of the extreme point of the wing of a dynamic tillage operating part. The graphical and empirical dependences of the deflection value of the elastic element, the movement of the extreme point of the wing and the amplitude of its oscillations from the bending moment, the speed of movement and the load of the dynamic tillage operating part are given. It was found that within the range of bending moment variation from 36.2 to 95.35 N⋅m, the deflection of the elastic element ranges from 5.5 to 15.8 mm. At the same time, within the limits of the change in the speed of movement of the dynamic tillage worker from 1.94 to 3.61 m/s, the average value of the movement of the wing extreme point increases from 11.55 mm to 14.75 mm. The relationship of the parameters considered above on the bending moment, load and speed of movement of a dynamic tillage operating part is described by empirical dependencies with the coefficient of determination R
2 = 0.67 – 0.85. The error of the sample mean Sy of the investigated parameters of the dynamic operating part varied within 0.039 – 0.136.
Formation of technological properties and structure of high-speed powder steels and the influence of alloying components on the processes of diffusion and splicing during sintering and hot stamping
Authors: Egorova R , Egorov M , Atrokhov A , Ishchenkova V , Kovtun M , Sarkisian D , Saakian S 
Published: December 2020

Abstract
Using powder metallurgy, it is possible to produce more durable and wear-resistant tools made of high-speed steel. Such a tool works more effectively than a carbide tool when processing with impact and removing large allowances. But in certain niches, the tool made of high-speed steel, especially powder steel, which is characterized by greater wear resistance and strength compared to ordinary steel, retained its leadership.
On a problem of the elastic wedge-shaped body oscillations generated in its rib zone
Authors: Berkovich V , Poltinnikov V 
Published: December 2020

Abstract
In the paper there studies the wave process in the wedge-shaped body exited by the antiplane shear oscillation generators in the rib zone surface. Mathematical model construction is fulfilled by the mixed dynamic boundary value problem reduced to the boundary integral equation (BIE) about contact stresses in the domain of given oscillation generators. Previous author’s papers permit to construct BIE solution and reconstruct the wave field in the whole wedge-shaped medium. To estimate the correctness of application of the solution mentioned above the wedgeshaped medium with generators is transformed to the half-space. Then the solution of the mixed problem for the half-space is constructed by two independed methods: by the method based on BIE and by use the degenerated elliptical coordinates. Both solutions are in rigorous coincidence.
Structure formation of cast Al-Mg-Si alloys during the melts irradiation with nanosecond electromagnetic pulses
Authors: Deev V , Ri E , Prusov E , Ermakov M , Slavinskaya N 
Published: December 2020

Abstract
An assessment of the grain refining effect of nanosecond electromagnetic pulses on the structure of cast aluminum alloys of the Al-Mg-Si system is carried out. The relationship between the amplitude of nanosecond electromagnetic pulses (5, 10, 15 kV) and the structural and morphological parameters of the irradiated aluminum alloys is shown. It was found that the processing of the melts at an amplitude of 15 kV is accompanied by the greatest refinement of the structural components of the alloy, and also by a change in their morphology and a decrease in microporosity in the structure of cast ingot. Theoretical analysis of the influence of nanosecond electromagnetic pulses on the structure and properties of aluminum alloys from the standpoint of the theory of the microheterogeneous structure of metal melts is given.
Mathematical and computer models of the gas flow movement near the shaped cover of the rough grinding machine
Authors: Kuptsova I S , Bulygin Yu I , Azimova N N , Loskutnikova I N 
Published: December 2020

Abstract
The aim of the study is to improve working conditions for operators of grinding machines by ensuring sanitary standards for dustiness in the workplace. To achieve the goal, it is necessary: to develop a mathematical model for the dispersion of abrasive-cast iron dust when grinding fragile parts; mathematical and computer models of the aspiration of the rough grinding machine; to propose an engineering method for calculating the efficiency of a cover in the form of a built-in casing and the choice of elements of a dust removal and dust collection system for grinding machines of the class under discussion. The article presents the mathematical and computer models of aspiration of a roughing-grinding machine, implemented in modern software Ansys. The dependencies, describing the flows of velocity fields in the closed area of the grinding wheel are obtained, which influence the formation of flow lines near the shaped cover of the roughing-grinding machine, which will make it possible to determine the efficiency of the cover of the roughing-grinding machine, including the design stage in future.
Simulation of the cable part of the load-lifting device drive, represented as a rod system
Authors: Ivanovskaya A V , Bogatyreva E V , Rybak A T 
Published: December 2020

Abstract
In this paper, the cable part of a lifting device operating on a marine vessel was studied. When the object is being towed, the “the vessel – the lifting device – the cargo system” makes non-stationary motion. In this case, the parameters of the cable part of the device: the distance between the points of the wire cable hanging, the length of the wire cable, its shape, and hydrodynamic resistance are variable. In the simulation of wire rope, it is proposed to replace it in the form of a rod system. During researches the mathematical model of small fluctuations of rod system on the basis of the Lagrange equation of II sort has been developed. Using the example of two-, three- and four-rod systems from age-old equations, dependences for their own frequencies are obtained and natural forms of small vibrations are constructed. However, as the number of rods in the system increases, the number of elements and degrees of freedom increases, leading to a significant complication. Therefore, at modeling similar types of load-lifting elements, it is recommended to limit the number of rods.
Finite element simulation of airflow in a field cleaner
Authors: Panfilov I A , Soloviev A N , Matrosov A A , Meskhi B Ch , Polushkin O O , Rudoy D V , Pakhomov V I 
Published: December 2020

Abstract
The work is devoted to the study of the dynamics of the grain mass in a stripping field installation and a stationary installation for separating grain. At the first stage, a model of the air mass movement in the installation under consideration is constructed and, on the basis of a mathematical model that takes into account the turbulence of the air mass movement, using the finite volume method in the ANSYS package, the velocity and pressure field is calculated. The influence of the technological parameters of the installations on these fields is studied: the diameters and rotation speed of the stripping drum and the additional drum-fan, the shape of the surface of the upper deck of the installation chamber. The calculations performed allow us to choose rational geometric and kinematic parameters at which no stagnant zones arise in the chamber.
The procedure of fire-resistance calculation for compressed reinforced concrete elements
Authors: Korolchenko Dmitry , Artem’ev Evgenii 
Published: December 2020

Abstract
Fire-resistance calculations adopted in the regulatory system (both in the Russian and in European) are based on calculations of isofields of section heatup of structural elements. Heatup isofields for reinforced concrete elements specified in the regulatory system have been obtained by the concrete section calculation not considering inclusions of reinforcement bars. But it is known that accuracy of the fire-resistance calculation of reinforced concrete elements depends on performance accuracy of a thermotechnical calculation. Having performed this calculation the temperature field distribution by element section and strength characteristics depending on it are determined. Temperature distribution by element section depends on such parameters as heat-absorption capacity and thermal conductivity of section parts, section humidity. Within the work the approach to solving the problem of consideration of the actual temperature field when calculating fire-resistance of reinforced concrete and steel-reinforced concrete elements has been reviewed. Calculations of fire-resistance at temperature fields not considering inclusions of reinforcement bars (concrete section) as well as at temperature fields considering reinforcement bar inclusions have been performed. Additional coefficients introduced in the fire-resistance calculation when using Russian and European methods have been calculated for the reviewed section with 600×600 overall dimensions. According to calculation results the change of section bearing capacity upon the calculation considering thermotechnical characteristics of the reinforcement bars has been observed.
Method of mathematical modeling for the experimental evaluation of fire retardant materials parameters
Authors: Korolchenko Dmitrii , Minaylov Denis 
Published: December 2020

Abstract
In experiment planning research, mathematical methods play an active role. The main task of the researcher is to choose the optimal methodology for conducting the experiment. The experiment is an abbreviated design of full factorial tests and can be considered acceptable due to the small correlation between influencing factors and outputs. The features of the formulations of new composite fire retardant materials have been investigated. The main physical and chemical properties of the materials have been determined to provide fire protection.
Theory of the technological machine state recognition by the criterion of resource uncertainty
Authors: Sevryugina N , Apatenko A , Revyako S 
Published: December 2020

Abstract
The solution to the problems of assessing the technical condition of special equipment is presented at a multidisciplinary level, as a combination of scientific and technical, practice-oriented research. The purpose of study: development of a digital mechanism for assessing the uncertainty of the state of special equipment systems with real-time monitoring of the intensity of parameter changes, recognition and predictive notification of the probability of risk-failure. It has been established that, in accordance with the theory of probability, there can be only one failure in a unit at a time, even if several damages are diagnosed, and then there is always a single cause. The introduction of the concept of “integrated parameter” supplemented the characteristics of functional and structural multiparameter connections of the state of the unit and made it possible to substantiate the mechanism for recognizing the uncertainty of the state of special equipment systems as a whole. A diagnostic model has been built based on the use of the main provisions of information theory, which represents the unit as a system containing the risk of uncertainty in terms of failure, which is distributed over all structural elements of the unit. An algorithm for recognizing the spatial displacement of uncertainty zones is proposed, the translation of which into a digital format with the introduction of a characteristic criterion will provide a search for a defect (risk-failure). The practical implementation of the risk-failure recognition mechanism is carried out on a simulation model of a change in the state of a technical system using the example of a cardan joint of a technological machine, which is under severe operating conditions during reclamation work. The inclusion in the design of technological machines of a digital module for monitoring the technical condition of the unit is substantiated, including: a module for recognizing the elemental structure; a software shell with a calculation algorithm for evaluating parametric changes; module of interface predictive notification of risk-failure; service control module by state.
Calculation and research of the diaphragm compressor main elements
Authors: Lebedev A , Fateeva E , Kozhukhov Y , Kartashev S , Toloknova I , Burakov A , Tikalov A 
Published: December 2020

Abstract
The article presents the experience of calculating and studying of the high-pressure membrane compressor main elements research experience, running on gaseous oxygen. The following issues are considered: determining the distribution and limiting disks surface profile, compressor main loaded elements strength calculation, modeling the temperature distribution in the membrane block during operation. These studies can be useful for further membrane compressor units development and can be used as a basis for calculations and new installations design.
Application of the environmentally safe operating schemes to the cooling systems of ship power plant
Authors: Fedorovsky K , Fedorovskaya N , Enivatov V 
Published: December 2020

Abstract
The possibility of using the ecologically safe operation on a closed-loop circuit instead of an open-loop cooling system is considered. For this purpose, it was proposed to use the ballast tanks on the ship. To ensure effective heat removal, it is proposed to apply a jet inlet of coolant to the hull shell of a ship. The flow regimes of the impact fluid jet were visualized. The critical Reynolds number is determined. Heat transfer coefficients and generalizing calculation dependences are determined by experiments.
Measures to improve the environment (example of Krasnodar, Russia)
Authors: Konovalova T V , Inozemtceva A Y , Balaev E Y , Litvinov A E , Mironova M P 
Published: December 2020

Abstract
The article discusses measures to improve the environment, presents the measures proposed by the mayor of Krasnodar, describes the advantages of building parks for residents. The project “SOS! Air”, an interactive map with foci of pollution. The problem of pollution of the center of Krasnodar is described. The project “General cleaning” is considered. Conclusions are drawn about the need to preserve a clean environment.
Comprehensive assessment of the impact of technological processes of mechanical processing on the environment and people based on the energy representation
Authors: Pushenko S , Shvartsburg L , Ryabov S , Ivanova N 
Published: December 2020

Abstract
The article considers the some indicators of quality of technological processes machining, characterizing their impact on the environment and human, which determine the competitiveness of these processes. This primarily refers to the safety performance indicators which are specific to the technological processes machining – power consumption, vibration, noise, air pollution of the working area products of thermal degradation of cutting coolant, and some others. In addition, the work also touched upon questions related to social aspects of improving occupational safety performance.
Factors affecting vulnerability level of farming households to climate change in developing countries: evidence from Eritrea
Authors: Debesai M G 
Published: December 2020

Abstract
Most research conducted on vulnerability assessment considers grossly at regions, countries and population groups on an aggregation of the communities. Few if any have critically assessed vulnerability at the individual household level in developing countries. In this research, an assessment of factors that determine the vulnerability level at the farming household in developing countries focused in Eritrea has been conducted. Based on the data from the baseline survey of the Ministry of Agriculture Eritrea, an econometric analysis was conducted to assess the factors affecting vulnerability levels to climate change. A logistic regression model was used and result indicates that various socioeconomic, biophysical and environmental factors influenced vulnerability levels of households differently. Important factors including level of education, profession, location, gender, income diversity, poverty level, access to credit and market, poverty level, dependency ratio and access to clean water were found to affect significantly the vulnerability level to climate change of farming households. It is recommended that development policy targets on key points that promote resilience and adaptive capacity of farming household, including education, gender equality, income generation, access to credit and market.
Resistance of fractal structures to natural and man-made influences
Authors: Kravchenko G , Pudanova L 
Published: December 2020

Abstract
The theory of fractals is applicable for creating the real objects and for constructing the independent elements of the framework or the whole structure of the building. It’s supposed that this type of building has reliability and stability to natural and man-made influences. Innovative program was developed to research the fractal forms. The object of the study was a three-dimensional Mandelbrot fractal. New terminology has been developed and applied to three-dimensional fractals of even and odd powers. External structures of various powers of three-dimensional fractal were modeled and researched. The resistance analysis of fractal structures was conducted by using a power coefficient of the fractal’s exostructure. It’s pointed, that fractal structure is most rationally to produce by 3D printing. The 3D model of the fractal was printed from ABS plastic and can be used as a frame of the unique building.
Wave breakthrough factor in dam destruction
Authors: Goncharova O , Bunina Y , Gaidukova M , Egorov V , Mikheeva O 
Published: December 2020

AbstractCurrently, more and more attention is paid to water bodies. All hydraulic engineering construction projects created by humans pose a particular danger to human life and health. Without proper care, the structure wears out and deteriorates. It can lead to the destruction of the latter and finally to the emergency. The article discusses the operational status of the partitioning structure - the dam on the Kazenny pond, Dergachevsky district, Saratov region. The calculation of probable harm in an accident at the hydraulic structures of the reservoir are presented and problems of presentation of the research results at the international level from the point of view of adequate translation in English, where specific terms are widely used, is described.
Technical, technological and managerial solutions in ensuring environmental safety
Authors: Meskhi B , Bondarenko V , Efremenko I , Larionov V , Rudoy D , Olshevskaya A 
Published: December 2020

Abstract
The article examines the target attitudes of Russian consumers to the services of “green” hotels. The authors substantiate that among the consumers of hotel services, the so-called millennials are gradually beginning to prevail, inclined to collect impressions focused on the choice of goods and services in the digital space. In Russia, at present, consumers are less demanding of the hotel business in terms of its “green” focus. They perceive the “green” orientation of hotels as a marketing ploy, and not a concern for them and society. It is concluded that society, as a whole, faces the task of ecological education of young people within the framework of the value paradigm of “green” development, which will subsequently lead to trends in the choice and model of consumer behavior similar to those in the rest of the world.
Methodological bases for assessing the level of environmental safety of dynamically developing urbanized territories
Authors: Bespalov V , Kotlyarova E 
Published: December 2020

Abstract
Constant transformations taking place in urban areas infrastructure lead to a change in the nature of environmental components’ impact, which requires the methodological bases improvement to assess the level of environmental safety of dynamically developing urban areas. To solve this problem, authors proposed the use of environmental, economic and social criteria with the substantiation of the principles of its calculation and description of possible results for each direction. The methodological foundations presented in the article are one of the stages of constructing a methodology for assessing the level of environmental safety of dynamically developing urbanized territories, taking into account the qualitative changes in environmental factors, functional and planning transformations of the urban landscape, as well as accompanying socio-economic transformations.
BIM technologies for the design of active solar heating systems
Authors: Galkina N , Gurova O , Govorunov M 
Published: December 2020

Abstract
Building Energy Modeling (BEM) is a complex and diverse process that allows you to achieve better results even with typical design tasks. By using BEM software, it is possible to provide a non-trivial approach to the development of architectural planning and engineering solutions, often combined with each other, to ensure high quality and effective implementation of results. An excellent example of such a process is the use of BEM technology in conjunction with the design of solar heating systems placed on the facades of the building. This approach makes it possible to take into account and practise various subtleties and aspects that are often inaccessible in traditional (without the use of BEM and BIM technologies) design - accurate accounting of heat intake and losses through individual sections of structures, including heterogeneous ones; temperature distribution to individual elements of structures, directly to structures and buildings as a whole, and much more.
Buffer zones of the loessial massifs ecological framework as the necessary condition of its sustainable development
Authors: Lavrusevich A , Mamina D , Stepanov V 
Published: December 2020

Abstract
The design of buffer zones of buildings consisting of ecological skeleton biogeocenosis construction on loess arrays, is essential for the normal functioning of buildings throughout their life cycle. If the removal of such dangerous phenomena as pseudokarst, subsidence and erosion are involved at the stage of design and construction, the development and manifestation of these processes during the operation in the buffer zones can cause deformation and even complete destruction of buildings. Therefore, requires monitoring buffer zones, which delimit technogenic changed territory (TIT) and ecological framework for preventive action reduce the negative impact of dangerous geological processes of natural and anthropogenic genesis.