bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ecological and economic evaluation of development technology of Kumuhsky deposit of thermal waters
Authors: Dzhavatov D K , Azizov A A 
Published: September 2020

Abstract
An ecological and economic assessment of the Kumukh thermal water field development based on a binary geothermal power plant was carried out. To show the prospects and the possibility of increasing the energy efficiency of a binary geothermal power plant at different temperatures of the injected coolant. Using a specific thermal water field as an example, the primary circuit technological parameters of a geothermal power plant were optimized, and its energy efficiency was evaluated in subcritical and supercritical organic Rankine cycles. It is shown that optimization allows to significantly improve the efficiency of energy cycles in the field, and the utilization of low-potential energy of spent brines in heat pump plants allows saving substitute fossil fuels. The analysis shows that the creation of integrated technologies for the field high-potential mineralized geothermal resources’ development will significantly improve the region’s economic structure and environmental situation. The creation of a binary geothermal power station at the Kumukh thermal water field will allow obtaining relatively cheap, environmentally-friendly electric energy with a capacity of up to 15 MW, and 2-3 MW of usable thermal power in heat pump installations, with an annual output of 135 · 106 kW · h of electric energy (more than 350 million rubles/year) and the annual savings of replacement fossil fuel more than 4000 tif. in a year.
Method vertical seismic profiling and evaluation of producibility of Miocene deposits in Hovsan oilfield
Authors: Ahmadov T R , Amirov A M 
Published: September 2020

Abstract
The article is devoted to the analysis and interpretation of the VSP data (vertical seismic profiling) obtained in two wells of the Hovsan field. It gives information about the history of the study, the geological and geophysical characteristics of the field and the seismic surveys by the VSP method conducted here in 2010 and 2014 in the wells of 1856 and 1867, respectively. The main parameters of the VSP wells are briefly described and the quality of the seismic material is characterized. Analysis of the velocity obtained from the VSP and Sonic Log acquired in investigated wells shows that after a significant increase in the values of the interval velocities to 4500-4700 m / s at depths of 3600-3800 m, a sharp decrease is observed in their values to ~ 2000 m / s at depths of ~ 5150 m, which corresponds to the speed at a depth of 1000 m. This is confirmed by the seismic inversion of the VSP data. The interval of a sharp decrease in the velocities of seismic waves corresponds to the deposits of the Miocene. This clearly indicates the presence of abnormally high pore pressure in this oilfield, associated with fluid accumulations, which is of great practical interest.
The mechanical mounder technological parameters justification
Authors: Tsypouk A M , Rodionov A V , Pekki L P 
Published: September 2020

Abstract
For intensive reforestation, machines should be used that will not only reduce the time and labour required for artificial reforestation, but also reduce the need for subsequent young stand treatment (early tending and early pre-commercial thinning). These machines include machines for creating the humus mounds with mineral soil cover - for example a domestic rotary tool ORM-1.5 or its foreign counterparts - a two-row mounder of the Bracke M24.a type and a three-row mounder of the Bracke M36.b type. Petrozavodsk State University (PetrSU) has developed the design of a new two-row forestry machine for creating humus mounds with mineral soil cover - the mechanical mounder MK-2 (RF patent No. 141061, IPC A01G 23/00). The paper discusses the methodology for calculating the main technological parameters of the MK-2 mechanical mounder machine: the mounder machine rotors angular velocity, the mounds and depressions parameters formed by the mounder rotors (height, depth and length); the gear ratio between the power take-off shaft of the tractor and the mounder rotors’ value. The calculations established that the main design parameter of mounder MK-2 – the rotor rotation speed – must be four times less than the forestry unit translational speed (tractor + mounder) to achieve a common step in the mounds preparation about 1.2 m. The developed machine further studies (the MK-2 mounder) are recommended in the following directions: the MK-2 mounder design parameters refinement based on the testing prototype results in the field; technology development for the MK-2 mounder rational use for reforestation.
Environmental assessment of the quality of the Elek and Or rivers in the zone of influence of enrichment waste and metallurgical production
Authors: Kairakbaev A K , Abdrakhimov V Z , Abdrakhimova E S 
Published: September 2020

Abstract
The greatest threats for the environment are the dusts and sludges of ferrous metallurgy industry dispersed by wind during storage. For the Elek river, the threat is the ferro-dust, and for the Or, the main hazard is the sludge tailings. The performed survey has shown that the Elek and Or waters belong to the 4th class with the water pollution index of 4.15 for the Elek and 4.10 for the Or, which is interpreted as “polluted waters”. Throughout the entire length of the Elek and Or rivers the water quality class varies from 4 (polluted water) to 6 (very filthy water). The hexavalent chromium (Cr6+) content in the Elek River is 4.2 of the threshold limit value; the trivalent chromium (Cr3+) content exceeds the threshold limit value by 3.0 times; for the Or, these values exceed the threshold limit value by 2.2 and 1.5, respectively. Hexavalent chromium belongs to Group 1 carcinogenic substances. In both rivers, the boron threshold limit value value was also found to be exceeded; for example, boron B3+ (trivalent boron) content in the Elek river was found to exceed the threshold limit value value by 7.8 times, and in the Or, by 2.8 times. The present paper is intended to demonstrate that the recycling of large-tonnage wastes, such as the ferro-dust and sludge tailings, in the production of such stock commodities as ceramic bricks may facilitate the proper industrial waste disposal and protection of the industrial environment.
Formation of greenbelts as an environmental protection tool
Authors: Oznamets V V , Belokonev G V 
Published: September 2020

Abstract
The objective of this paper is to study the mechanisms and processes of functioning of the suburban forest and parkland zone of a big city and analyze the models of its formation. This paper contains a description of urban air self-purification mechanism with the use of forest park green belts and water surfaces. The article introduces the concept of an ecological network. The ecological network includes green belts and water areas, primarily, rivers. To build an ecological network, it is necessary to apply 3D and information modelling. The article describes three main greenbelt formation models. The article recommends the development and formation of greenbelts as multipurpose models and ecological networks.
To the forecast of residual resource installation of electric centrifugal pump for oil production
Authors: Topolnikov A S , Gimaltdinov I K , Gimaltdinova A A , Kochanova E Y 
Published: September 2020

Abstract
The results of numerical modeling of the operation of a well equipped with electric centrifugal pump installations under conditions of a gradual deterioration of pump characteristics (head, flow rate, efficiency) are presented. In this case, the residual resource of the installation is estimated as a period of time during which, due to a gradual increase in frequency, it is possible to maintain a constant flow rate of the well. Recommendations are given for determining the residual life in the field based on indirect measurement of pump performance degradation. A method for determining the residual life of a well equipped with installations of electric centrifugal pumps under abrasive wear conditions is proposed.
Analytical calculations of the parameters of pollutant emissions and the justification of methods for reducing surface gas pollution from working aircraft engines
Authors: Zvyagintseva A V , Kulneva V V , Sazonova S A 
Published: September 2020

Abstract
The estimation of pollutant emissions from a mobile diesel generator for starting aircraft engines recorded the following qualitative composition of the exhaust gas mixtures from the aircraft: CO, NOx (total NO2 and NO), C, CH (total hydrocarbons), SO2, CH2O, C20H12 (3,4-Benzpyrene). An analytical calculation was made from a stationary diesel generator of maximum and gross emissions of individual i-th pollutants. A quantitative assessment of pollutant emissions from racing tests of aircraft engines on bench measuring systems has been implemented. An analytical calculation was made of the characteristics: the amount of i-pollutants during the take-off and landing cycle, departing from the aircraft, gross emissions for 2 types of engines ICE-1 and ICE-2, and the most sold for bench runs of aircraft engines. The calculation of the maximum one-time amount of pollutants emanating from a source of pollution into the atmosphere is fixed taking into account the limiting factor - by the maximum emission concentration, this is for ICE-2. It was established: analytical calculations for the second test site recorded that, during control diagnostics of the operability and reliability of aircraft power plants on bench measuring systems, nitrogen oxides and carbon monoxide also prevailed in emissions from engines.
Potential possibilities of hydrogen accumulation in Nickel-based solid-state materials
Authors: Zvyagintseva A V 
Published: September 2020

Abstract
A variant of a hydrogen accumulator based on electrochemical systems has been investigated. Niwas used as the basis, as a material with a greater tendency to absorb hydrogen. Nix-By-H (D)z composites were synthesized by the electrochemical method. Adding B to the Nix-By composite increases the accumulation of hydrogen. In Ni-B composites, boron plays the role of a hydrogen atom catcher, since tensile stresses arise in the vicinity of the substitutional impurity of a small atomic radius - boron placed in the FCC nickel lattice, therefore, hydrogen, as compared to nickel, segregates with higher synergism near boron. The potential of interaction of a hydrogen atom with an impurity trap in the form of a boron atom is estimated at 42 eV. The thermal desorption spectra of deuterium were studied of Ni–B composites at T ~ 100 K, pre-implanted with deuterium (testing element). The ratio of Ni and deuterium Ni: D = 1:1, and for the composite Ni95B5 [Ni95: B5]: D = 1:1.25. Desorption peak - 325 K.
On the decomposition of gas hydrate at a positive temperature
Authors: Tazetdinov B I , Chiglintseva A S , Gimaltdinov I K , Kochanova E Y 
Published: September 2020

Abstract
This paper presents a study of the decomposition of hydrate at a positive temperature, taking into account the flowing down water from its surface. Two cases of decomposition of a cylindrical sample of a hydrate are considered, the first – the generatrix of the cylinder is located vertically, the second – the generatrix is located horizontally. It is shown that the decomposition rate is higher for a horizontally located hydrate sample. It was found that at a higher temperature (287 K), the intensity of decomposition of gas hydrate samples increases and the time for complete decomposition of vertical and horizontal samples begins to be 122 s and 105 s, respectively.
Environmental assessment of the impact of the meteorological conditions on technogenic formaldehyde and carbon black pollution of the air in Voronezh
Authors: Kurolap S A , Klepikov O V , Yeprintsev S A 
Published: September 2020

Abstract
Based on the Voronezh hydrometeorological service official statistics analysis, the pollutants (formaldehyde and carbon black) dynamics regularities depending on the various meteorological parameters combination - air temperature, wind speed, relative humidity. A positive relationship was established between atmospheric pollution growth with formaldehyde and air temperature. As the wind speed and the air relative humidity increase, the formaldehyde and soot concentration in the urban atmosphere, as a rule, decreases. The carcinogenic risk maximum permissible level to public health, causing concern, has been established. The obtained patterns can be used to predict the city’s atmosphere technogenic pollution level depending on meteorological conditions. Based on the official statistic analysis from the Voronezh Hydrometeorological Service, the pollutants (formaldehyde and carbon black) dynamics patterns are investigated depending on various meteorological parameters’ combination - air temperature, wind speed, relative air humidity. A positive relationship has been established between the increase in atmospheric pollution with formaldehyde and air temperature. With increasing wind speed and relative humidity, the formaldehyde and soot concentration in the city atmosphere, as a rule, decrease. The maximum permissible carcinogenic risk level to public health has been established, causing concern. The obtained patterns can be used to predict the city’s atmosphere technogenic pollution level, depending on meteorological conditions.
The use of ash and slag material from the Aktobe thermal power plant in the production of porous aggregates based on liquid glass compositions contributes to the development of a green economy
Authors: Kairakbaev A K , Abdrakhimov V Z , Abdrakhimova E S 
Published: September 2020

Abstract
The use of energy waste from thermal power plant ash and slag materials in the production of building ceramic materials helps to relieve environmental tensions in the regions, develop a “green” economy and transport and logistics infrastructure. Studies have shown that the ash-slag material has an increased content of organic matter (loss during calcination of 19-21%), carbon (C=7.8%) and calorific value (1600 kcal/kg), which will burn out or contribute to burning (for example, calorific value), creating porosity in the ceramic material. On the basis of liquid glass modified with sodium chloride and ash-slag material of the Aktobe TPP, a porous aggregate with high physical and mechanical parameters was obtained without the use of natural traditional raw materials (natural thinners, clay binders, etc.). Given that many ceramic factories to produce products for construction purposes as well as thermal power plant, located in the city or near the city, transport and logistics infrastructure can be solved more effectively through the use as a raw material slag material of a thermal power plant.
Revising the effectiveness of thermal method application for unconventional bitumen oil production stimulation
Authors: Gizzatullina A A , Tazetdinova Yu A 
Published: September 2020

Abstract
A theoretical model of petroleum reservoir engineering process with high viscosity oil using the technology of double horizontal wells is proposed. Numerical solutions of the problem in a two-dimensional formulation are obtained. With this method of producing high viscosity oil the efficiency of oil reservoir development can be increased by ensuring uniform heating of the developed zone of the field. The proposed model allows us to trace the two-dimensional picture of oil filtration in the reservoir and investigate the main regularities of the process. The costs for oil reservoir heating, flow rate development and changes in the mass of pumped oil in the initial period of well operation are determined. The obtained solutions for a long stretch of time were extrapolated.
The dynamics of sound waves in a tube with elastic walls filled with gas-liquid mixture
Authors: Gimaltdinov I K , Gizzatullina A A , Gimaltdinova A A 
Published: September 2020

Abstract
A theoretical model, describing the dynamics of sound waves in an elastic thin-walled tube, filled with bubble fluid is proposed. The dispersion equation is obtained, on the base of which the numerical values of the phase velocity and the logarithmic decrement are obtained. It has been established that for sound waves extending over the bubble fluid, which is located in a tube with elastic walls, there is a frequency band that is characterized by a strong wave damping. It is shown that the value of the phase velocity of sound waves in a bubbly liquid in the low-frequency region for an elastic tube is lower than that of a similar parameter in the case of a tube with “rigid” walls.
Contributions of VT and VV exchanges to the CO2 relaxation in the full state-to-state modeling
Authors: Gorikhovskii V , Nagnibeda E 
Published: September 2020

Abstract
Numerical modeling of nonequilibrium state-to-state carbon dioxide kinetics is a computationally complex problem requiring the solution of a huge system of stiff differential equations. In the present study, we use parallel numerical scheme, based on the extended backward differential formula with adaptive timestep strategy. Using this scheme, we study the contribution of various types of energy exchanges to the solution of kinetics equations. The comparison of the results obtained with the use of the ”cut” and full state-to-state approaches is also shown in the paper.
Critical stress analysis for the basis of a denture prosthesis
Authors: Arutyunov S D , Nikitin A D , Grachev D I , Bagdasaryan G G 
Published: September 2020

Abstract
This paper is focused on the numerical simulations for the mechanical behavior of the prosthesis basis under typical chewing loads. The model is supplied by physically correct boundary conditions. The stress analysis in the prosthesis basis is performed for the cases of symmetric and not-symmetric loading conditions. The sets of numerical calculations were performed for all the stages of food chewing. It was found that not-symmetric loading has a higher influence on the structural integrity of the prosthesis. The significant stress amplitudes on the basis were found under the loading at the block I (incisors) and block II (fang). It is shown that the maximum stress due to typical chewing loading usually cannot produce the prosthesis fracture in one cycle. However, the stress level is high enough to produce the fatigue crack initiation.
Smooth reconstruction method for surfaces defined by a continuous set of triangles
Authors: Kh Abuziarov M , Chekmarev D T 
Published: September 2020

Abstract
The paper considers the problem of triangular grids distortion in three-dimensional space, approximating the boundaries and interfaces of interacting solid, liquid and gaseous media. Unacceptable deformations of the mesh cells size and shape can occur during the numerical solution of continuous media dynamics problems. A method and algorithm for rebuilding grids using smooth piecewise polynomial interpolation by algebraic polynomials of the third degree is proposed.
Stability of the collinear point L
1 in the planar restricted photogravitational three-body problem in the case of equal masses of primaries
Authors: Bardin Boris S , Avdyushkin Andrey N 
Published: September 2020

Abstract
The planar restricted photogravitational three-body problem is considered. The motion of an infinitesimal small body (particle) under the Newtonian gravitational attraction of two bodies (primaries) is studied. It is supposed that primaries having equal masses move in weakly elliptic orbits and act on the particle with radiation pressure repulsive forces. Using the method of normal forms, the nonlinear stability study of the collinear point L
1 is performed and rigorous conclusions on stability in the sense of Lyapunov or formal stability are obtained.
Experimental study on viscous fingering in Hele-Shaw cell under acoustic impact
Authors: Marfin E A , Garaeva S V , Abdrashitov A A 
Published: September 2020

Abstract
Viscous fingering shaped as curvature of the fluid displacement fronts are usually formed in porous media and Hele-Shaw cell when a liquid with a high viscosity is displaced by a liquid with a lower viscosity. Such interfacial instability is undesirable in many displacement processes, and mainly in oil production. We present the results of physical modeling of the displacement of viscous oil by air in Hele-Shaw cell. As a method of suppressing undesirable interphase instability, the effect of elastic vibrations on the process is proposed. The experiment was performed in stationary conditions and under acoustic action on the displacement process. In the absence of superimposed vibrations, the growth rate of viscous finger is 2.15 times higher than the speed of liquid flow at the cell border. The imposition of acoustic oscillations can both accelerate and slow down the growth rate of viscous fingers depending on their frequency. The paper discusses the peculiarities of the development of viscous fingering. The results are compared with the calculated data.
A new numerical approach for solving initial value problems with exponential growth integral curves
Authors: Kuznetsov E B , Leonov S S , Tsapko E D 
Published: September 2020

Abstract
Some physical processes raised in aerodynamics, hydrodynamics, and theory of catalytic reactions are modeled by stiff initial value problems. This paper considers a class of stiff problems such as singularly perturbed problems for ordinary differential equations. Singularly perturbed problems have regions of rapid change in the solution, which are called contrast structures. Most often, boundary layer exhibits in such problems, but several pieces of research devoted to inner layers too. There are many numerical and asymptotic methods for solving singularly perturbed initial value problems with contrast structures. However, it is still an open field for researches because the universal method does not exist. Problems with an exponential growth rate of integral curves have a particular interest for researchers because most of the methods for solving singularly perturbed problems cannot handle these. We are going to discuss methods for solving singularly perturbed initial value problems with contrast structures. Also, we are proposing a new technique based on the method of solution continuation for problems with the exponential growth of integral curves. This technique allows explicit numerical methods to get the solution of the considered problem when it seems impossible for them. The efficiency of the new approach will be shown on the test initial value problem.
Features of aggregation of fuzzy expert judgments
Authors: Sudakov V , Sivakova T 
Published: September 2020

Abstract
The paper discusses methods of aggregating fuzzy judgments of experts based on fuzzy weighted sums and fuzzy areas of preference. The study is based on soft calculations. The approach based on fuzzy weighted summation allows you to take into account the degree of trust in the expert and his qualifications. The fundamental nature of the study is determined by the fact that the proposed approaches are invariant with respect to the subject area, it will allow you to effectively solve the problems of supporting the adoption of group decisions in case of fuzzy preferences. The authors developed algorithmic and software methods on the portal http://ws-dss.com.
Using GRU based deep neural network for intrusion detection in software-defined networks
Authors: Kurochkin I I , Volkov S S 
Published: September 2020

Abstract
This paper considers the possibility of using machine learning methods in solving the problem of intrusion detection in software-defined networks (SDN). The work is devoted to the research and development of a network attack classifier, which is a core of the intrusion detection systems. To evaluate the methods, an existing data set was used, which includes network traffic records with a several different network attack scenarios. A comparison of machine learning methods implementing neural networks on a selected data set is presented. Based on the results, it can be concluded that the task of intrusion detection in software-defined networks can be successfully solved using deep neural networks.