bluuebunny/crossref_metadata_2025 huggingface dataset:
Studying gold nanoparticle degradation during laser ablation–single particle-inductively coupled plasma mass spectrometry analysis
Authors: Metarapi Dino , van Elteren Johannes T. , Šala Martin
Published: June 2021

This work is a study of gold nanoparticle (NP) degradation upon laser ablation and provides guidelines for the optimal laser fluence for NP analysis by laser ablation single particle inductively coupled plasma mass spectrometry (LA-sp-ICPMS).
Integration of fluxome and transcriptome data in Saccharomyces cerevisiae offers unique features of doxorubicin and imatinib
Authors: Taymaz-Nikerel Hilal
Published: June 2021

Comparison of differential fluxes and co-expressed genes under doxorubicin and imatinib stress provided potential common and unique features. Analyzing such regulatory differences helps in resolving drug mechanisms and suggesting new targets.
Hafnium–zirconium oxide interface models with a semiconductor and metal for ferroelectric devices
Authors: Chae Kisung , Kummel Andrew C. , Cho Kyeongjae
Published: June 2021

In MIM devices (left), internal field is small in contrast to MIS FeFETs (right) consistent with high MIM endurance due to electrostatic interactions between dielectric and ferroelectric layers.
Two-dimensional C3N/blue phosphorene vdW heterostructure for Li, Na and K-ion batteries
Authors: Ubaid Mohammad , Aziz Anver , Pujari Bhalchandra S.
Published: June 2021

We investigate a van der Waals heterostructure constructed using BP and C3N and investigate its use as an anode for lithium-, sodium- and potassium-ion batteries.
Studies on the structural, magnetic and electrochemical properties of GdMn1−xFexO3 (x = 0, 0.1 and 0.2) perovskite compounds
Authors: Tiwari Priyanka , Gangwar Deepti , Rath Chandana
Published: June 2021

The tunable physical properties of the rare earth manganite GdMnO3 hold significant promise for different applications.
Coordination compounds containing 2-pyridylselenium ligands: synthesis, structural characterization, and antibacterial evaluation
Authors: Cervo Rodrigo , Lopes Thaísa R. R. , de Vasconcelos Adriana R. , Cargnelutti Juliana F. , Schumacher Ricardo F. , Tirloni Bárbara , dos Santos Sailer S. , Abram Ulrich , Lang Ernesto S. , Cargnelutti Roberta
Published: June 2021

New coordination compounds bearing 2-pyridylselenium andd-block metals were synthesized and structurally characterized. The complexes showed antibacterial activity againstStaphylococcus aureusandEscherichia coli.
Self-absorption-free excited-state intramolecular proton transfer (ESIPT) emitters for high brightness and luminous efficiency organic fluorescent electroluminescent devices
Authors: Kumsampao Jakkapan , Chaiwai Chaiyon , Sukpattanacharoen Chattarika , Chawanpunyawat Thanyarat , Nalaoh Phattananawee , Chasing Pongsakorn , Kungwan Nawee , Sudyoadsuk Taweesak , Promarak Vinich
Published: June 2021

ESIPT derivatives functionalized with N-electron donating moieties show pure keto form emissions with high solid-state fluorescence. As emitters, their OLEDs exhibit exceptionally high brightness (41 292–44 820 cd m−2) and high luminous efficiency (8.41–10.30 cd A−1).
Conformational plasticity of the ULK3 kinase domain
Authors: Mathea Sebastian , Salah Eidarus , Tallant Cynthia , Chatterjee Deep , Berger Benedict-Tilman , Konietzny Rebecca , Müller Susanne , Kessler Benedikt M. , Knapp Stefan
Published: June 2021

The human protein kinase ULK3 regulates the timing of membrane abscission, thus being involved in exosome budding and cytokinesis. Herein, we present the first high-resolution structures of the ULK3 kinase domain. Its unique features are explored against the background of other ULK kinases. An inhibitor fingerprint indicates that ULK3 is highly druggable and capable of adopting a wide range of conformations. In accordance with this, we describe a conformational switch between the active and an inactive ULK3 conformation, controlled by the properties of the attached small-molecule binder. Finally, we discuss a potential substrate-recognition mechanism of the full-length ULK3 protein.
High voltage energy efficiency power supply
Authors: Makov Sergei , Kudryavcev Boris , Grinev Ilya , Minaev Alexander
Published: July 2021

This article discusses the selection of operating modes for the high voltage power supply of the electrostatic dust collector. Methods of high voltage generation, voltage regulation in converters and the choice of the converter operation mode are considered.
On the question of quantitative modeling of the process of freezing products
Authors: Semenov Evgeniy , Sidorenko Yury , Tefikova Svetlana , Sidorenko Mikhail , Shterman Sergey
Published: July 2021

It is known that the cooling of food prevents the reproduction of microflora, thus contributing to the preservation of the beneficial properties of products. Despite this, the cooling process is still the least studied stage of cold processing, which necessitates further in-depth study of the problem discussed in the article. Given the diversity and volume of processing facilities and the energy resources they consume, it is important to justify the analytical and numerical apparatus to address many engineering and plant-based cooling products of technological challenges. Below, in the article, computer-based tools are used to be different from the method used conveniently enough for practical purposes to quantify and calculate the common in production process of food freezing.
Modeling the distribution of rock mass and native copper output by size classes during crushing
Authors: Korniyenko Valerii , Malanchuk Yevhenii , Khrystyuk Andriy , Kostrychenko Valentyna , Shampikova Assel , Nogaeva Kulzhamal , Kozhonov Almaz
Published: June 2021

The article considers the features of the distribution of technological indicators (product output, content and extraction of copper) by size classes, the main factors influencing the crushing process are identified and regression dependences of productivity on influencing factors are received. The parabolic nature of the dependences of the output of crushed rock on the size class is established. The high adequacy of the obtained models was confirmed and the most promising classes of rock size for copper extraction were determined. The obtained results and models will allow to develop a generalized model of the process of native copper mining and to implement this process with rational and optimal parameters. Also, the received models will allow to carry out an estimation of productivity of a research site of processing of raw materials of basalt quarries.
Sustainability and reliability ensurance models for automated technological systems in chemical industry: systemic ergonomic approach
Authors: Lavrov Evgeniy , Siryk Olga , Volosiuk Aleksandr , Zolkin Aleksandr , Sedova Nelly
Published: June 2021

The paper considers accidents and potential hazards of the world chemical enterprises, and provides statistics of accidents and human casualties. The authors investigate harmful factors affecting the production process and a human-operator, showing the central role of a human in the technological process (both as a source of errors and as an active element that eliminates errors, failures and cyber attacks’ consequences). We essentially consider automated technological complex as a Human-Machine-Environment system, thus a human-system approach should be applied. The authors developed a complex of systemic components and morphological models, which describe the human-machine system in the sections required for analysis, to ensure sustainable and reliable design with initial data. The authors also propose a method and information technology for interfaces’ ergonomic assessment; the principles for adaptive interfaces design; and mathematical models and information technology to assess safety and timeliness indicators of the chemical production operators’ activities. The models are based on the principles of the functional-structural theory by Anatoly Gubinsky, Vladimir Evgrafov, Akiva Asherov, Pavel Chabaneko and others, and on the mathematical apparatus of functional networks. Further, the authors develop an optimization model for decision supporting organizing the human-machine control technology, using the criterion of minimizing losses from unreliability and unsustainability. Both the models and the information technology have undergone extensive testing, including solving the tasks of: choosing the automation level for the control process; distributing functions between operators; control algorithms design; user interface design, design of agent-managers to support the operators’ activities. The results can be used as the basis for a decision support system to ensure sustainability and reliability of automated technological systems in chemical industry.
Construction technology for affordable housing with the use of space-braced concrete-filled steel tubular framing
Authors: Savytskyi Mykola , Nikiforova Tetiana , Nosenko Oleh , Kotov Mykola , Papirnyk Ruslan
Published: June 2021

Among many tasks to be done by the state, the most significant is a social-economic one i.e. provision of its citizens with affordable, long-lasting, energy- efficient and economical housing. One of the ways of doing the given task is the application of concrete-filled steel tubular (CFST) structures, for the elements of a building, of circular, square or rectangular type. It is also possible to use such structures not only for a new housing stock but in the reconstruction of present one at the expense of additional storeys (about 20); without demolition and total resettlement of tenants of the house under reconstruction. Alongside with this, there is an opportunity to increase total area of residential houses and make new types of comfortable place of various purpose.
Simulation of two-dimensional distribution laws of random correlated quantities of natural-climatic factors in context of probabilistic assessment of reliability of hydraulic structures of cascades of hydroschemes
Authors: Mozgovyi Andrii , Spirande Karina
Published: June 2021

When performing calculations to assess reliability of hydraulic structures of cascades of hydroschemes on the basis of probabilistic methods, the necessity to simulate random natural-climatic phenomena producing loads and effects on hydraulic structures arises. In particular, statistical series of random quantities of such important natural-climatic phenomena are considered: annual lowest average monthly temperatures, annual maximal amplitudes of average monthly temperatures. Each of the enumerated natural-climatic phenomena is characterized by presence of close correlation connections between random quantities when passing from one hydroscheme of the cascade to another. The necessity to consider correlation connections requires construction (simulation) of joint distribution law of random quantities system. The purpose of the work is simulation of joint distribution law of system of random variables that do not satisfy the normal distributions, taking into account correlation connections between random variables when passing from one hydroscheme of the cascade to another. Methods of the theory of correlation and methods of mathematical statistics with the use of software package MathCad were used in the course of the investigation. Simulation of joint law of distribution of system of random variables that do not satisfy normal distributions, taking into account correlation connections between random variables when passing from one hydroscheme of the cascade to another, and also assessment of accuracy of results, that were performed, have shown advantages of this approach from the viewpoint of accuracy of results obtained by different procedures. The results can be used in probabilistic calculations of reliability of hydraulic structures and cascades of hydroschemes.
The transformation of the engineering and planning organization of the territory of the Luhansk region in the conditions of the functions changing of the regional typology
Authors: Sokolenko Valerii , Sokolenko Kostiantyn , Chernih Oleg , Piddubnyi Sergiy
Published: June 2021

The conditions of the origin, development and transformation of the Donetsk and Luhansk regions of Ukraine are considered. There is an irreversible tendency to reduce the industrial potential of the coal and metallurgical industry, the collapse of the urban base. The nature and scale of the impact of the armed conflict in eastern Ukraine on the state of engineering and planning organization in the territory of Luhansk region is studied. Trends of development, circumstances and preconditions of formation of agglomerations of the region are determined. The correspondence of regional typologies on the basis of function in modern conditions of armed conflict is analyzed. The analysis allows us to identify the following important aspects. A gradual but irreversible process of deindustrialization is recorded. The transformation of the engineering and planning organization of the territory of the Luhansk region in the conditions of the armed conflict in the East of Ukraine is a fait accompli. A new political and economic reality is being formed. The Luhansk and Donetsk regions are artificially divided. The internal status of the region has led to the formation of a large number of urban agglomerations, a dense transport network. The analysis of a demographic condition, a territorial, town-planning complex testifies to discrepancy of typological signs of the area in the modern conditions. The Luhansk region is becoming a cross-border region with a dense border. It is expedient to expand the existing classification of regions by introducing certain special functions of the regional typology. In modern conditions in the Luhansk and Donetsk regions the border region is formed. Along this line, the function of cross-border cooperation is complemented by the function of border control. This function aims to limit a certain type – the fixation of the border, the mode of its crossing, strict compliance with statutory procedures. The addition of the functions of the regional typology should be taken into account in the tasks of improving the territorial – planning organization of Luhansk region.
Thermal comfort analysis in the sustainable educational building
Authors: Dębska Luiza , Krakowiak Justyna
Published: June 2021

In the modern world, a person spends most of his life indoors. That is why it is so important to create optimal conditions for the internal environment. Research on thermal comfort and subjective feeling of people inside the building can help in this. The article discusses two methods that are used in research on thermal sensations. This makes it possible to know the thermal assessment of people and then compare this result with the calculated PMV value, which is calculated using the formula from ISO 7730 standard.
Modeling of hydrogen sulfide removal under biomethane production in the concept of renewable energy potential growth of Ukraine
Authors: Chernysh Yelizaveta , Bálintová Magdalena , Chubur Viktoriia
Published: June 2021

Today, the global trend in the development of renewable energy sources is the implementation of integrated processing of organic waste with the production of biogenic gases such as biomethane. In this case, an essential focus is the study of biogas purification processes to methane. This paper focuses on the process of modeling biochemical purification of biogas from hydrogen sulfide to develop the direction of biomethane production. Simulation of hydrogen sulfide bio-oxidation process with the use of granulated carrier based on phosphogypsum was conducted using experimental data from previous studies to verify the adequacy of the proposed mathematical model. Thus, to implement the process of phosphogypsum utilization in technological systems of biogas purification, it is important to consider the level of bioactivity in the immobilization of bacteria on the loading surface of phosphogypsum and the degree of biotransformation of phosphogypsum components in the oxidation of carbon dioxide and hydrogen sulfide impurities to achieve the highest ecological effect. Also, the use of overlay visualization allowed to form the main clusters of development of research potential in the field of biogas technologies for Ukraine.
Modeling and simulating dynamics of lithium-ion batteries using block-oriented models with piecewise linear static nonlinearity
Authors: Mykhailenko Oleksii
Published: June 2021

The article deals with the research of the efficiency of modelling the dynamics of voltage change in lithium-ion rechargeable batteries in charging/discharging modes using nonlinear block-oriented systems. Drawing on experimental data, a structural and parametric identification of the Hammerstein, Wiener and Hammerstein-Wiener models with a polynomial structure of the linear dynamic block and piecewise linear static nonlinearities was performed. It has been established that the best modelling accuracy was ensured by using the Hammerstein-Wiener system with a linear model having the 6th order of the numerator and denominator polynomials and an input delay of 3 samples. It showed 15.67% and 6.2% higher accuracy compared to the Wiener and Hammerstein systems, respectively. The application of those models in battery management systems will make it possible to improve the control quality for battery assemblies of solar and wind power plants in the context of the variable nature of the charging/discharging processes due to the variability of weather conditions and fluctuations in power consumption during a 24-hour period. This will ensure a wider introduction of renewable power generation into existing power systems, which is currently the leading way to ensure sustainable development of the energy sector.
Workability conditions determination of network distribution with overhead lines power transmission with the 6-35 kV
Authors: Kutin Vasiliy , Kutina Marina , Kovalov Artem , Maksimov Sergyi
Published: June 2021

The principal of identification of isolation workability in relation to a ground was proposed. It is based on the electrosafety criteria usage and a minimum current flow to a ground. The conditions of workability of isolation of distribution network is calculated in look of changes of isolation workability restrictions in relation to regulations and standards. A mathematical model for the calculation of isolation workability in a look of a relation of workability indicators to the isolation parameters according to a ground. By analyzing the adequacy it as set that introduced formed models assumptions result in the appearance of a method error to 3,5 %.
Research of modular multilevel converter with phase-shifted pulse-width modulation
Authors: Kozakevych Ihor , Siyanko Roman
Published: June 2021

The work is devoted to the study of performance of a multilevel electric energy converter using phase-shifted pulse-width modulation. Equations describing the state of a dynamic system multilevel converter - load are investigated and a mathematical model of the system in Matlab / Simulink environment has been constructed. Variants of implementation of phase-shifted pulse-width modulation systems from the point of view of influence on harmonics of output voltage and magnitude of circulating current in the converter are investigated.
Efficient use of energy resources in the context of sustainable development of the pulp and paper industry of Ukraine
Authors: Kupalova Halyna , Ignatyuk Anzhela , Goncharenko Nataliia , Andrusiv Uliana , Kopetska Yuliana
Published: June 2021

The article is devoted to the problem of increasing the efficiency of using energy resources of enterprises of the pulp and paper industry in Ukraine. It has been determined that the pulp and paper industry belongs to energy-intensive types of economic activity. Based on the results of the correlation and regression analysis, a connection was revealed and an economic and mathematical model was formed of the dependence of energy costs for the production of 1 ton of paper on the productivity of paper machines, equipment wear and the volume of investments in energy saving measures. Application of the proposed model will improve information support for the analysis of the effectiveness of energy saving measures, forecasting energy costs and strategic energy management in general. It was carried out at pulp and paper mills, the main obstacles to replacing fossil fuels with biomass in heat production were identified. This made it possible to develop a scientific and organizational model for the energy modernization of enterprises in the pulp and paper industry. It includes financial, organizational, environmental, regulatory, technological, scientific and educational tools. Their application at management will help improve the infrastructure of enterprises in terms of the use of renewable energy resources.
Methods of improving power indices of electric drive active rectifiers for mine hoists
Authors: Sinchuk Oleg , Filipp Yulii , Somochkyn Albert , Strzelecki Ryszard , Baranovska Mila
Published: June 2021

The research deals with analyzing peculiarities of using active rectifiers in frequency controlled electric drives of underground mine hoists. There are developed MATLAB models aimed at comparing two types of control systems – hysteresis-based and the one with pulse-width modulation. The research aims to analyze power modes and parameters of active rectifiers, quality of voltage control, current and power of active rectifiers and to determine ways of improving power indices of electric equipment of hoists as well as provide power compatibility of electric equipment and underground mines’ grids. Main attention is paid to analyzing circuitry of control systems of active rectifiers, parameters of power transformers and reactor equipment at underground mines’ substations, frequency converters and synchronous slow-speed motors. There are also analyzed statistic data on power consumption at underground mines equipped with automated systems of commercial and technical power meters and specific consumption of power. The research results reveal advantages of the pulse-width modulation control system as compared with the hysteresis one by using such indices as speed-performance, quality of control, potential of controlling reactive power and the power factor. Application of the research results will enable determining structures and methods of adjusting control over the active rectifier in the frequency-controlled drive of underground mine hoists.
Forecasting of the number of bird collisions with turbines in the territory of Pre-Azov region wind park using the route census method
Authors: Yeremieiev Volodymyr
Published: June 2021

The information system has been designed to ensure the analysis of information on the monitoring results of the wind power plant (WPP) territory using the route census method. The database contains 48 fields, reflecting the monitoring results of birds’ behavior in the territory of WPP and processing the initial data: year, month and day of observation, a number of birds of this species, flight altitude, flight speed, direction of flight, coordinates of the bird registration point on the Google-map, average number of birds flying over the territory of the wind park at a given time, coordinates of the points of intersection of the bird flight path with the perimeter of the wind park or observation site, the length of bird flight path over the observation site, and other parameters. The analysis of distribution of birds in the territory of the “Primorsk-1” WPP according to the types of migration (forage, transit, nesting, and ground), direction of flight and altitude characteristics has been carried out. The total number of registered birds was 8927 specimens of 72 species, of which 802 specimens of 11 species were referred to the transit type, 2511 specimens of 32 species – to the forage type, 5614 specimens of 60 species were on the ground (ground type). Most birds (63%) belong to the ground type. 28% of birds were registered in the forage group, 9.0% of birds were flying in transit. The greatest activity of birds is manifested in the autumn migration season, when the transit group accounts for 77% of all annual transit flights. The proportion of birds of forage and ground types, registered in autumn, is 68% and 74%, respectively, of the total number of birds registered in autumn. In the group of ground birds, the overwhelming majority of specimens belong to the period of autumn migration (4141 birds or 74%). The least number was observed in the winter season (317 birds or 5.6%). The author proposes a mathematical model for analyzing birds’ interaction with turbines using the results of monitoring the territory of wind power plants by means of route census method. The model makes it possible to obtain information on the probability of different species of bird collisions with wind wheels and the number of collisions with turbines, depending on the flight characteristics of birds, parameters of wind parks and observation conditions in different seasons. In the risk zone of birds’ interaction with turbines, only specimens of one species, Buteo buteo, were observed. The calculated probability of one bird collision when passing through the wind wheel is 0.19. The anticipated number of bird collisions with turbines during one year of the “Primorsk-1” wind park functioning is in the range of 5.6÷6.7 specimens.
Effect of mineral additives to a gypsum wet deformation
Authors: Plugin Andrii , Iefimenko Artem , Borziak Olga , Gevorkyan Edwin , Kaliuzhna Olena
Published: June 2021

The influence of mineral additive, i.e. ground granulated blast-furnace slag on artificial gypsum stone humidity strains has been studied. The slag content was varied in the range from 0 to 0.33 by weight based on the total amount of the mixture. The measurements were carried out on prism samples with dimensions of 160x40x40 mm. The samples were placed vertically in containers with water, the deformations were measured using dial indicators. It was established that the humidity strain value depends on the content of the granulated milled blastfurnace slag. A maximum strain of over 0.001 m/m is observed for the gypsum stone without mineral additive. A relative strain is decreased with an increase in the slag content. Minimum humidity strain of 0.0003-0.0004 m/m was observed for the artificial gypsum stone with the relative slag content of 0.05-0.1 and more than 0.27. This fact confirms our assumption that the water concentrated in the contacts between the individual crystals and particles of the structure of gypsum stone has a wedging effect that contributes to a low water resistance of gypsum. The values of the humidity strains of the artificial gypsum stone are suggested for the use as additional indicators of its water resistance.
Increasing the production of gas condensate by using ammonium carbonate salts
Authors: Dmytrenko Viktoriia , Zezekalо Ivan , Vynnykov Yuriy , Hristov Nikolay , Meracheva Gergana
Published: June 2021

The work is devoted to the problem of increasing gas condensate production in gas condensate fields. It was found that ammonium carbonate salts, in the absence of calcium chloride type waters, interact with carbonate rocks, increase the permeability of reservoirs. Solutions of ammonium carbonate salts when interacting with formation water of the calcium chloride type form chemically precipitated chalk in the pore space, while the permeability of carbonate rocks decreases. A set of experimental studies was carried out to study the displacing and washing properties of ammonium carbonate salts. It was found that ammonium carbonate salts have high displacing properties, the displacement ratio of kerosene by NH4HCO3 solution is 0.75-0.80, while reservoir water – 0.55-0.58. According to the results of laboratory studies of the displacing and washing characteristics of ammonium carbonate salts, conclusions were made about the effect of bicarbonate solution (ammonium carbonate salts) on the production characteristics of a well in reservoir conditions at temperatures of 80-100 °C and above. Industrial tests of ammonium carbonate salts showed an increase in gas flow by 30-50% at wells № 23 of Opishnia, № 115 of Mashivka, № 3 of Tymofiivka gas condensate fields. The effect of formation treatment with ammonium carbonate salts is achieved due to clearing of well bottom zone and increasing the formation permeability. At wells № 56, 108 of Yablunivka and № 58 of Tymofiivka gas condensate fields, an increase in the condensate ratio was observed by 22-35%. The effectiveness of this treatment is associated with the simultaneous bottomhole zone cleaning from asphalt-resinous contaminants and permeability increase, as well as with the hydrophilization of the pore space and mobility increase of condensate precipitated as a result of carbon dioxide effect, which was rejected as a result of decomposition of ammonium carbonate. Thus, experimental and industrial tests in Opishnia, Mashivka, Tymofiivka, Yablunivka gas condensate fields of Poltava region confirmed the effectiveness of using ammonium carbonate to increase hydrocarbon production. The prospect of further research is aimed at developing a technology for increasing the production of liquid hydrocarbons by using ammonium carbonate salts.
Influence of the size of hematite and magnetite ores on the parameters of the sintering process and the quality of the sinter
Authors: Babaievska Olga , Plotnikov Vladimir , Konovalova Mariia , Suslo Natalia , Motovilov Igor
Published: June 2021

Laboratory sintering of sinter charge based on hematite and magnetite iron ores of various sizes was carried out. The purpose of the study was to determine the effect of the type and size of the ore material on the gas permeability of the sintered layer, sintering performance and the need for fuel. The granulometric composition, cold strength, strength during recovery, and reducibility of the resulting agglomerate have been studied. Differences in the course of the process of agglomeration of hematite and magnetite ores at different sizes were revealed in the research. The established patterns have practical interest from the point of view of increasing the efficiency of the sintering process, improving the quality of the sinter and reducing the harmful impact on the environment.
Developing of X65 steel coils making at Steckel mill using thermo-mechanical control process
Authors: Kurpe Oleksandr , Kukhar Volodymyr , Klimov Eduard , Chernenko Serhii , Prysiazhnyi Andrii
Published: June 2021

The process of thermo-mechanically controlled rolling in the conditions of Steckel mill of Ferriera Valsider plant was developed for the first time for hot-rolled coils in the sizes of 12 mm × 1510 mm from steel of X65 grade for further production of electric welded pipes according to the API-5L standard. The developed process provides carrying out of the roughing-rolling in two stages to facilitating the forming of a smaller austenite grain and therefore more dispersed and homogeneous inherited ferrite structure in the finished rolled product. At the implementation of the process, the holddown of the temperature at the desired level at 1780 Steckel rolling mill has been carried out by adjusting the number of burners in furnace coilers. The process of controlled air cooling of rolled coils to a temperature of 400°C after winding in the developed technology for Steckel’s mill condition of Ferriera Valsider plant is applied for the first time that allowed to reduce the thickness of the air scale layer and to improve the surface quality. The performed research has been allowed to evaluate the feasibility of the operating equipment and to determine the possibility of coils fabrication related to the nowadays world requirements and satisfied to the demand of European electricwelded pipes manufacturers.
Optimization of the combined explosion hardening processes
Authors: Shchetynin Viktor , Arhat Roman , Drahobetskyi Vladimir , Puzyr Vyacheslav , Maloshtan Dmitriy
Published: June 2021

The proposed method for calculating the loading parameters makes it possible to determine the wear parameters after explosion hardening. The calculation method is simple and less time consuming compared with calculation methods that involve the use of nonlinear programming methods. The main methods of increasing the wear resistance of mining equipment parts using explosion methods are generalized. The reserve for increasing the wear resistance consists in the optimization of deformation parameters during the power and thermal intensification of processes and the development of new methods and technologies of hardening. The factors (parameters) of the studied processes: explosive cladding, alloying, hardening, are formulated. Optimization of the processes under consideration is possible by decomposing the process into simpler ones with subsequent optimization of the parameters of these processes and the synthesis of the obtained solutions. For the first time, a solution to the multicriteria problem of two-stage explosion hardening is presented. It is proposed to split the process into simpler ones. Optimization criteria are proposed for each of the simplified processes. The problem is reduced to a conditional extremum problem, which is solved by composing the Lagrange function. By transforming the wear equation, the optimal ratio of strength and ductility for parts operating under abrasive wear conditions is determined.
Defining the information flows for DLT of a transport company in the mining industry according to the criteria for sustainable development
Authors: Hristova Teodora , Anastasov Dimitar , Evtimov Zdravets
Published: June 2021

The application of information technologies leads to the improvement of the companies’ production parameters in each sector according to the criteria for sustainable development. Naturally, in order to achieve efficiency, they must be tailored to the specifics of the industry, in this case the mining industry. The article proposes a methodology for the introduction of Distributed Ledger Technology (DLT) for the transport information flow at a mining company. Based on the chosen organizational structure, the participating actors and the data they share, the information channels are determined. According to the necessary rights of the participants to modify the transactions and the number of channels of the transport information flow, a consensus mechanism Practical Byzantine Fault Tolerant and the so-called smart contract have been chosen. Different DLT platforms are analyzed. Hyperledger Fabric was selected as an appropriate platform in order to ensure the continuity of the system, the asynchronous control of the various channels and the ability to include different actors.
Technological basis of processing of serpentinite copper-gold ores in the Kyrgyz Republic
Authors: Nogaeva Kulzhamal , Alpiyev Yessil , Kozhonov Almaz , Korniyenko Valerii , Malanchuk Yevhenii
Published: June 2021

Annotation.

The article is devoted to the development of an effective technology for processing serpentinite ores from the Bozymchak deposit in the Kyrgyz Republic. Based upon the analysis of mineralogical, physical and chemical parameters of the ore, the authors set reasons for the decrease in technological indicators of the existing concentrator and determine concentrating properties of the reviewed serpentinite resistant material by applying methods of intensifying the flotation process by using additional flotation collectors/depressors and introducing the process of mechanochemical activation of the pulp before flotation. In the proposed technological flowsheet, main requirements for the technological flowsheet and reagent suite of processing serpentinite ores are formed and it is acknowledged that an increase in the grinding size, introduction of the selective copper collector and additional depressor determines the prospects for improving the “reagent” component of determining factors of the set task. Materials of the article can be useful for mining and processing enterprises while involving resistant copper bearing, magnesian serpentinite ores in the processing in order to increase the raw material base of the existing mining and processing complex.
On the issue of determining the main factors of gas hazard in coal mines of Ukraine
Authors: Filatiev Mykhailo , Filatieva Elvira , Oleinichenko Aleksandr , Toderas Mihaela , Kuderinova Olga
Published: June 2021

The main sources of methane emission are located in the undermined coal-bearing strata, which is not taken into account by the requirements of regulatory documents when determining the category hazard of coal mines. Gas emission from each undermined source is not equally dependent on the tons of coal mined. The relative gas emission changes during the cleaning work and cannot be a criterion for assessing the gas hazard of the entire mine. The volatility of the gas emission index per unit area of the underworked space, which was formed because of monthly movements of the working faces, was established. In essence, this indicator repeats the dependence of the relative gas content per ton of coal mined, since the area of the underworked space is functionally related to the amount of coal mined for a certain period. Without coal mining, the rate of movement of the working face is equal to zero, and gas emission from a unit area continues for several months. As a result, the considered indicators do not have their specific meaning and, due to their inconstancy, they cannot reliably reflect the gas hazard of mines.
On the relationship between gas emission from undermined coal-bearing stratum and the intensity of coal seam mining
Authors: Mineev Sergei , Filatieva Elvira , Oleinichenko Aleksandr , Toderas Mihaela
Published: June 2021

A theoretical scheme of gas release from the coalbed under production by treatment workings has been developed. The sizes of zones of different intensity of gas release from the working thickness are set according to the characteristic points of muld shift of the earth's surface. Total amount of releasing gas is determined by the area of the developed space, over which there is an intensive movement of the mined coal. The formation of this area is associated with the development of cleaning operations within the boundaries of the excavation site and the speed of movement of the treatment face. During the development of the theoretical scheme, several assumptions were made, the validity of which was verified on the basis of experimental data obtained in the conditions of four mines at fifteen excavation sites. Coal seams with coals of grades G and A were worked out by them at a depth of 300-1195 m, the capacity of coal seams was 0.90-2.20 m, cleaning works were carried out at a depth of 300-1195 m, the length of the lavas was in the range of 74÷270 m. The monthly movement of the treatment faces and the amount of gas released during this period were taken into account for each excavation site. It is established that the relative gas release per unit area of the developed space remains a fairly constant value for some mining and geological conditions, if the total amount of gas is attributed to the area that determines the active movement of rocks over a moving treatment face. This allows you to use the previously obtained results of determining the categorical danger of mines by relative gas release per ton of coal production in terms of improving the forecast of gas release from the coalbed under production more efficiently.
Predicting anomaly conditions of energy equipment using neural networks
Authors: Sverdlova Anastasia , Zaporozhets Artur
Published: June 2021

In modern conditions for complex thermal power facilities, the issue of developing methods for predicting equipment failures is especially relevant. Methods based on the intellectualization of diagnostic systems and allowing to obtain predictive models based on the use of both current data received in real time from measuring equipment and retrospective information are considered promising. Intellectualization of the system in terms of the ability to learn allows to quickly adjust the parameters of forecasting models under changing conditions of equipment operation, to determine new deadlines for scheduled repairs and minimize equipment downtime. A limitation of the use of methods is the incompleteness of failure statistics, ie when equipment failures are rare or non-existent. Such diagnostics of energy equipment, especially thermal power facilities, contributes to a more environmentally friendly production.
Detection of intervals / layers in sections of the wells with anomalous areas of drilling mud filtrate contamination according to the well logging (with negative test results of horizons)
Authors: Karpenko Oleksiy , Sobol Vasyl , Myrontsov Mykyta , Karpenko Ivan
Published: June 2021

The zone of infiltration of the drilling fluid filtrate into the reservoir rock creates significant difficulties for the study by logging methods and during further testing of the formation. Due to the penetration of filtrate, significant contamination of the near-wellbore zone occurs. The porosity and filtration characteristics of reservoir rocks are changing. There is a possibility of blockage by filtrate in the invaded zone of oil or gas flow from the formation to the well. As a result of the studies carried out using well logging data, it was found that the presence and distribution of a mud cake on the borehole wall opposite the reservoir is an important factor influencing the process of filtration of the drilling fluid into the layers. On the examples of the Yablunivske oil and gas and Kolomatske gas fields of the Dnieper-Donets basin, it is shown that the absence of a mud cake on the borehole walls leads to the formation of maximum, anomalous zones of filtrate invasion. The determining of the diameter of the invaded zone was carried out according to the data of electrical logging methods. In addition, the diameter of the invaded zone was calculated as a solution direct task equation for the case of direct filtration without blocking by the mud cake. Comparison of the results of determining the diameter of the invaded zone by two methods made it possible to draw certain conclusions. An important conclusion is that even partial absence of mud cake on the reservoir wall in the well leads to horizontal and vertical filtration of the drilling fluid from the well into the formation. As a result, the invaded zone may be so deep, that the gas flow rate is absent even at high values of porosity, permeability and gas saturation
Differences in the generation of industrial waste from economic activities in Ukraine and the EU and the prospects for the integrated use of mineral raw materials
Authors: Gubina Victoria , Zaborovsky Victor , Mitsiuk Natalia , Srat Aboubaker Farag
Published: June 2021

The paper presents the comparative analysis of the amount of waste generated in Ukraine and European countries (except for radioactive waste) based on the official EU and Ukrainian statistical data. The data on waste generation are compiled according to the following classification: by economic activity and household, waste category, grades of hazard, and regions. In Ukraine, 352.3 million tons of waste was generated in 2018. By 2018, almost 13 billion tons of waste had been accumulated at the managed dumpsites, including about 12 million tons of hazardous and over 200 million tons of household waste. In the European Union, 2.6 billion tons of waste was generated in 2018. Over 70% of it was generated by 10 countries: Germany, France, England, Poland, Romania, Italy, Sweden, the Netherlands, Spain and Finland. By economic activity, the largest amounts of waste in Ukraine are generated by the mineral extraction and processing industry, the smallest – from water treatment and construction. In the EU countries, these values are somewhat different. For example, in Germany and France, the largest amounts of waste are generated from construction and manufacturing, the smallest – from agriculture, forestry and fishery. By waste category, the waste generated both in the EU countries and in Ukraine is mineral and solid waste. In Ukraine, the largest amounts of waste are produced and accumulated in the Dnipropetrovsk, Donetsk and Zaporizhzhia regions which accommodate large enterprises for extraction and mineral processing of iron and manganese ores, titanium-zirconium placers, coal, dolomite, and metallurgical limestone, as well as metallurgical and ferroalloy plants.
Potential of environmental responsibility and financial potential of innovative mechanical engineering enterprises in Ukraine
Authors: Gernego Iuliia , Petrenko Liudmyla , Dyba Mykhailo
Published: June 2021

In the era of sustainable economy, the environmental responsible companies provide an important background both for particular industry and national economy competitiveness. In particular, mechanical engineering plays an important role in the economy of Ukraine. In accordance with national statistic, the Ukrainian mechanical engineering provides 6.4 % in total volume of industrial products and ~4 % of the gross value added in the GDP of Ukraine. At the same time, the global mechanical engineering industry environmental friendly activity is related to SDG 9 and SDG 12. In March 2020, the Cabinet of Ministers adopted its Programme, reaffirming the commitment to the SDGs and their importance for Ukrainian economy development. Thereby, research problem lays upon the financial potential of innovative mechanical engineering enterprises in Ukraine providing the background to increase the potential of their environmental responsibility. The paper aims to provide scientific support on mechanical engineering industry representatives that tend to be environmental friendly. The research methodology is based on Ukrainian mechanical engineering enterprises data (5 years and 337 industry representatives) processed by statistical analysis. The financial and environmental indicators are represented in results section on the basis for six groups of mechanical engineering enterprises’ analysis, namely: big unstable – 16; big stable – 17; medium unstable – 44; medium stable - 26; small unstable – 188; small stable – 46. Thus, the environmental dimension is increasingly taken into account by Ukrainian innovative mechanical engineering enterprises to be competitive. Big and medium stable enterprises are organizationally oriented to be environmentally sustainable. The main disadvantage of big and medium unstable enterprises is lack of financial resources for achieving sustainable goals. Small enterprises are lack of general capacity to conduct environmental support policy, but they are the most flexible ones that provide advantages in environmental management. The study results can be used within industrial and business programs of environmental responsible activity and its financial support. In relation to other branches or countries, more extensive study is required.
Landscape approach to formation of system of ecologically balanced use of natural resources: legal framework
Authors: Yermolenko Volodymyr , Hafurova Olena , Deineha Maryna , Novak Tamara , Sinitsky Julia , Ulugov Umidjon
Published: June 2021

The article is devoted to the analysis of legal framework and theoretical provisions of the landscape approach to the formation of the system of ecologically balanced use of natural resources, the definition of its essence and content, highlighting of conditions and principles of its functioning. Proposals for elimination of legal problems in the field of development and realization of the concept of ecologically balanced use of natural resources are covered. It is determined that the legal formulation of landscape approach principle to the use of natural resources will ensure unity, integrity, comprehensiveness of nature management, coherence and balance of interests in this area, implementation of ideas for the formation of system of environmentally sustainable use of natural resources and sustainable development concept, and the adoption of relevant regulations will solve our state’s urgent task on the path to further European integration.