bluuebunny/crossref_metadata_2025 huggingface dataset:
Magneto-acoustic investigation on steel samples
Authors: Szabados O. , Baki R. , Zs  , Csincsi  , Molnar J. , Pámer Á. , Szabó P. , Por G.
Published: August 2020

Experiments have been carried out using yoke for energizing alternating magnetic field in the steel samples. We used acoustic emission sensors and ultrasound microphone for recording acoustic signal born in the steel material. Results of experiments clearly show the presence of Acoustic Barkhausen noise. We are introducing graphs presenting dependence of acoustic time response signal on magnetic signal (inductance) in form of Lissajous curve. It is claimed that this new method gives more in-sigh in the material than the widely used simple RMS measurement of acoustic response.
Deformation-softening in ultrafine-grained materials
Authors: Gubicza Jenö , Quang Chinh Nguyen
Published: August 2020

Plastic deformation is conventionally considered as a route for strengthening of metallic materials. During plastic straining, different crystal defects, such as dislocations, stacking faults and grain boundaries form, hardening the material. On the other hand, plastic deformation may also cause unexpected softening in ultrafine-grained and nanocrystalline materials. This paper summarizes the existing knowledge on this deformation-softening effect.
Root cause analysis of metallurgical defects in continuous cast steel slabs at ISD DUNAFERR Zrt.
Authors: Wizner K , Kővári A
Published: August 2020

As market demands tighten, ISD Dunaferr Zrt. is placing increasing emphasis on improving the quality of its products. Line Scanner equipment used in rolling mills can identify most surface defects, but the majority of metallurgical faults are located beneath the surface (e.g. inclusions, cavity, gas bubbles, etc.). There is no standardized device for detecting them, only ultrasonic and microscopic testing is possible. In addition, it should be noted that some of the defects detected on the surface (e.g. surface cracks) can only be determined by microscopic testing, whether they are metallurgical or due to the parameters of the rolling process. Several pilot programs have been implemented to explore the causes. In this theme, the most significant pilot programs, as well as the evaluation of their results will be presented.
Joining aluminium and poly(lactic acid) specimens by laser beam – a feasibility study
Authors: Temesi T , Czigany T
Published: August 2020

In this article, our main aim is to demonstrate and prove that it is feasible to join aluminium and poly(lactic acid) (PLA) specimens by laser beam. We investigated the effects of structuring the surface of the aluminium specimens with corundum blasting and joining speed and used three types of PLA (with the same D-lactide content but different average molecular weights) to investigate the effect of the viscosity of the polymer melt on the load-bearing capacity of the joints. Joined aluminium-PLA specimens were successfully manufactured and examined with standard lap-shear tests. We found that both surface structuring, joining speed and the type of PLA material influenced the load-bearing capacity of the aluminium-PLA joint.
Manufacturing and investigation of aluminium matrix bimodal metal foams
Authors: Leveles B , Kemény A , Orbulov I N
Published: August 2020

Metal matrix foams (MMFs) are mostly used in the automotive industry due to their high specific energy absorbing capacity and relatively low weight. During this research, bimodal metal matrix foams were produced, where the filler was ceramic hollow spheres (CHSs) made of high-purity alumina with the nominal diameters of Ød1 = 7 mm and Ød2 = 2.4 mm. The hollow spheres of different sizes were used in 1:1, 2:1 and 4:1 volume ratio, which after mixing can be considered as uniformly distributed. Al99.5 was infiltrated between the CHSs with low pressure to create a cellular material. The manufacturing parameters have a significant influence on the properties of the finished metal matrix foam. Different preheating temperatures, melt temperatures, infiltrating pressures and time was applied to achieve proper wetting and filling. Samples were evaluated based on macro images and microscopic photographs.
Numerical modelling of the thinning behaviour of sheet metal parts
Authors: Gál V , Lukács Zs
Published: August 2020

In the automotive industry there are several software for numerical simulations to predict the behaviour of the material, which can reduce the expensive try-out experiments and dies cost. These software uses different mesh types. The goal of this work is to compare the different mesh element types in sheet metal forming simulations from the viewpoint of excess thinning. The benchmark of the 2018 NUMISHEET conference was the base of this comparison. This benchmark investigates the formability of a 2.8 mm thick, hot rolled sheet with 440 MPa tensile strength. The FE modelling of the process was made with thin shell-, thick shell-, and brick element types, thereafter; it was validated by the minimum thickness of the part based on physical data measurement. To better identify the differences due to the mesh elements, the thickness distribution of the part was investigated, too.
A comparative analysis of characteristics of cutting forces at micro-milling of hardened steels
Authors: Balázs B Z , Takács M
Published: August 2020

Abstract Micro-milling is one of the most important technologies to produce miniature components. Mainly due to the size reduction, the process has many special characteristics, such as the relatively large tool run-out, the relatively large deformation and the cutting edge radius of the micro-milling tool. The cutting force is often correlated to the phenomena mentioned above, its analysis is therefore often required. The main objective of the present paper is to analyse and compare the characteristics of cutting forces in micro-milling of different hardened steels. A systematic series of experiments were conducted on a hardened AISI H13 hot-work tool steel and a Böhler M303 martensitic corrosion resistance steel. The hardness of both materials is 50 HRC. A 500 µm diameter two fluted carbide micro end mill and a five-axis micromachining centre were applied. The effects of the cutting parameters are analysed by the analysis of variance (ANOVA). Experimental results show that the workpiece material has a significant influence on the cutting forces.
Investigation of the energy absorption properties of cross-linked polyethylene foams
Authors: Tomin M , Kmetty Á
Published: August 2020

We performed the dynamic mechanical investigation of cross-linked polyethylene (XL-PE) foams, which are the most commonly used polymer foams for damping purposes. Our experiments were primarily focused on analyzing the energy-absorbing capability of foams with different densities and studying the relationship between cell structure and shock absorption. The cell structure and energy absorption properties of the foams were determined by mechanical tests and microscopic examination. The samples were subjected to falling dart and falling weight impact tests using different weight geometries and impact energy. Our experiments showed that the impact damping properties of foams are significantly influenced by the deformation mechanisms in the cellular structure during dynamic loading since excessive deformation of the cell walls leads to the compaction of the foam, and therefore a significant reduction in impact damping capability.
On the relationship between parameters of melt spreading over the surface of substrates of variable composition and state diagrams
Authors: Bagov A M , Khasanov A I , Zubhadzhiev M-A V , Umarova L Kh
Published: August 2020

On of metered-dose drops of various concentrations on a substrate of variable composition. The basis for the substrates and droplets is the contact melting (CM) method related to state diagrams which are used to study the concentration dependence of surface characteristics (spot shape and size, wetting and spreading, surface tension, etc.) under the same conditions which improves accuracy of the characteristics. It was found that the microstructure of the transition zone of the substrate-drop depends on the location of the drop on the substrate, i.e. on the concentration of the substrate.
The study of application of Maslyanites in pumps designed for pumping aggressive media
Authors: Bataev D K-S , Goitemirov R U , Dzhamaldinova M A
Published: August 2020

For experimental studies, chemically active aggressive media pumped by single-screw metering pumps (SSMP) were used. The effect of these media on the destructive compressive stress, tensile strength, elongation, hardness, degree of swelling, antifriction properties and wear resistance of the polymer composite material Maslyanite D (S-1) was studied. It was established that hardness and antifriction properties of Maslyanite D (S-1) are better than those of SKN-26-based rubber 8470.
The use of carbon nanotubes in the fire extinguishing of oil and oil products
Authors: Dali F A , Shidlovsky G L , Khasikhanov M S , Zalaev R U , Tagirova P R , Saidulaev S S , Masaeva L M , Erzhapova R S
Published: August 2020

The process of quenching a flame of liquid hydrocarbons by suspensions of water with carbon nanostructures is studied. It is shown that the dispersion of carbon nanostructures in water intensifies heat transfer in liquids, which leads to their more rapid heating to boiling temperature under conditions of thermal exposure to a flame. During the experiment, it was found that the quenching time of liquid hydrocarbons by nanosuspensions is on average 3.5–5.0 times less than the time of quenching of a liquid with finely divided water.
Morphodynamic conditions of particle size distribution of beach sediments of Coastal Area of Karadag Natural Reserve
Authors: Drygval A V , Stanis E V , Drygval P V , Latushkina E A , Buldovich N S
Published: August 2020

The article presents the results of studying particle size distribution of sediments in the beach areas of the Karadag coastal area of the Crimean peninsula. In the framework of this study, this area is considered as a lithodynamic system. The paper describes the connection between the granulometric structure of sediments and external processes that affect this system, which is an important indicator of response of the condition of a coastline to dynamic environmental conditions. It is established that the wave processes, exogenous geological processes (mainly of a gravitational nature), abrasion of cliff and bench result in the transportation and accumulation of beach sediments along the coast, as well as determine the peculiarities of their distribution according to particle size distribution. Based on the particle size analysis, the differentiation of beach sediments along the coastline of Karadag is revealed. When calculating the static parameters of the particle size data, the morphodynamic conditions of distribution of sediments in the coastal area are characterized.
Obtaining SiC single crystals, and comparing characteristics of its solid solutions, films, Schottky diodes
Authors: Dadashev R H , Altukhov V I , Sankin A V , Sysoev D K , Elimkhanov D Z , Gudaev M-A A , Uspazhiev R T
Published: August 2020

The main methods for producing 4H-SiC single crystals and films of its solid solutions are considered. A new technique for producing single crystals of SiC polytypes is described. A new nonlinear model of the Schottky barrier height (BS) has been developed, and the current-voltage characteristics of Schottky diodes have been obtained, their comparison with the I–V characteristics of silicon-based diodes has been made.
Geoecological monitoring of the Khankal field based on thermal infrared imaging
Authors: Elsunkaeva E V , Ezirbaev T B , Ozdieva T Kh
Published: August 2020

The aim of the work is to review technology for assessing and modeling quality of the environment in industrial zones, the emission of pollutants into the atmosphere based on geographic information systems and environmental modeling taking into account environmental monitoring data. The article presents results obtained by using Geoscan 201 for simultaneous shooting with a Thermophrame-M thermal imager and a visible range camera.
Method of complex interpretation of results well logging (TABC Gintel) for the terrigenous rocks sections Tersko-Sunzhensky petroleum region
Authors: Ezirbayev T B , Khasanov M A , Gatsaeva S S-A
Published: August 2020

A brief overview of the proposed method of processing and interpretation of well logging data in Terrigenous deposits. And also presents results of data well survery with its application using the example terrigenous deposits Tersko-Sunzhensky petroleum region. The findings suggest that the interpretation of the results of the GIS, as described TABC gives accurate information to determine geological characteristics and hydrocarbon saturation Lower Cretaceous terrigenous deposits of the Tersko-Sunzhensky petroleum region.
Cable robot design method using the NX CAD / CAM / CAE system
Authors: Gaponenko E V , Anciferov S I , Kuzmina V S
Published: August 2020

The article describes a method for designing a cable robot used for moving goods under special conditions. It is a parallel structure mechanism using the NX CAD / CAM / CAE system controlled by the Teamcenter PLM system. The mechanism is a rigidly fixed frame connected by tensioned ropes to a platform containing an axial displacement device. The diagram of the device is presented. To develop an electronic-digital model of the robot, the control structure that allowed for designing using the “Top-Down” method was built. The control structure reduces time required to develop a model. The spatial parameters of the device were determined. The product concept was developed.
Average magnetization of quasi-binary solid solution of magnetic and non-magnetic ions
Authors: Gufan A Yu , Gufan Yu M , Klimova E N , Naskalova O V , Osipenko I A
Published: August 2020

The paper describes features of calculating the magnetization of solid solution based on statistical approach on the example of a one-dimensional crystal. Calculations are made in approximation of Weiss effective field. The result shows the error of the third Gilleo hypothesis, which is still widely used to forecast the magnetic properties of solid solutions.
Aggregation properties of p- and n-functionalized calix[4]resorcine in water/oil emulsion in the presence of sulfate reducing desulfobacter bacteria
Authors: Guseva E , Ziganshina M R , Isakov D R , Mendelson V A
Published: August 2020

This paper presents a comparative study of the aggregation properties of P- and N-functionalized calix[4] resorcines in “water/oil emulsion + Desulfobacter culture”. It has been shown that both compounds under study displayed aggregation properties in low concentration range. Nevertheless, their structural features affect the aggregation process. Moreover, the beginning of aggregation of N-functionalized calix[4]resorcine with petroleum hydrocarbons molecules and microorganism cells shifted to lower concentration zones than the one of P-functionalized calix[4]resorcine. However, P-functionalized calix[4]resorcine was characterized by a wider interval at which the structuring of the water/oil emulsion is observed.
Optimization of the regeneration of the sodium-cation ion-exchange filter
Authors: Kalinichenko M Yu , Stojanov N I , Abornev D V , Ovchinnikova S V
Published: August 2020

A new methodology has been developed for determining the volumetric coefficients of internal mass transfer according to the results of an experimental study. The values of volumetric coefficients of internal mass transfer were calculated and their dependence on the technical characteristics of the regeneration process of the sodium-cation exchange filter under dynamic conditions was established. A computer model of the process of regeneration of the sodium-cation exchange filter in nonequilibrium and non-stationary conditions in the form of a computer software package (“Regeneration-1”, “Regeneration-2”), recommended for scientific, design, commissioning and operating organizations, relevant industries. For the first time, the task of optimizing the ion-exchange nonequilibrium regeneration of the sodium-cation exchange filter as a separate stage of the filter cycle was posed and solved. The analytical dependence of optimizing the specific consumption of NaCl salt for nonequilibrium regeneration of the sodium-cation exchange filter as a separate stage of the filter cycle is obtained.
Magnetic-gravity separation in the simulation modeling paradigm
Authors: Nikolaev V G , Biryukov V V , Nikitin R M
Published: August 2020

An interdisciplinary approach to the simulation of magnetic gravity separation is proposed. The approach is based on revealing the laws of motion of mineral particles taking into account their magnetic properties in a computational experiment and establishing the form of an empirical multidimensional function for calculating the deposition rate of aggregated ferromagnetic particles in a multiphase multi-speed process medium. Based on the results, a comparative assessment of the convergence of the obtained deposition kinetics parameters with respect to the practice of applying the classical Stokes formula is given. The possibility of interpreting the fractional separation characteristics of the magnetic-gravity separator using the error function is shown. A method for integrating the simulation model of magnetic-gravity separation into an analytical prototype of the technological enrichment scheme is considered, for which the basic principles of constructing technological schemes for mineral processing are presented and the principles of constructing their simulation models are formulated.
Mineral particle disintegration model
Authors: Oleinik A G , Biryukov V V
Published: August 2020

The study proposes mathematical model for reducing the size of mineral particles in crushing and grinding operations, which is a form of the reflected normal Gaussian – Laplace distribution. The study considers the distribution density modification of the mineral particles depending on the magnitude of the energy impact during grinding. Comparison of the results of computational experiments with the results of laboratory studies confirms the possibility of using the proposed model of disintegration of mineral particles in the development of software modules for the operational evaluation for crushing and (or) grinding of mineral raw materials.
Proposal development for the boiler modernization at the Far North enterprise
Authors: Samigullina G Z , Platunova G R
Published: August 2020

The article presents the transfer relevance of the boiler from diesel to natural gas. There is an economic calculation of the efficiency in using a gas-equipped PKN-2 boiler with a GG-1 type burner, as well as the environmental efficiency of modernizing the boiler installation. Place: Novo Energy Services LLC enterprise, the Yamalo-Nenets Autonomous District, the Yurkharovskoye oil and gas condensate field, bush No. 2.
Modification as a method of directed change in the properties of ferro-piezoceramics
Authors: Sadykov Kh A , Shilkina L A , Daudov M R , Verbenko I A , Nagaenko A V , Reznichenko L A
Published: August 2020

Solid-phase synthesis followed by sintering using conventional ceramic technology produced ceramics based on the binary system of solid solutions (Na, Li) NbO3. The influence of superstoichiometric modification with nickel oxide on the internal structure (crystalline, grain) and macroresponses of the analyzed media is established. Based on the analysis of piezoelectric and ferroelastic properties, the prospects of using materials in various electronic devices are shown.
Comparative tests of cements in concrete mixtures of high mobility
Authors: Saidumov M S , Murtazaev S-A U , Alaskhanov A Kh , Nahaev M R , Khadzhiev M R
Published: August 2020

The paper presents the results of comparative tests of imported and local cements in highly mobile concrete mixtures of various classes and brands. It is proved that on the basis of local cement it is possible to obtain concrete of any grades in terms of workability and grades in compressive strength up to B45. Various factors affecting the stability of the composition and properties of the concrete mixture are considered. Recommendations on their use in high strength concrete are proposed.
Possible solutions to problems in the cement industry
Authors: Salamanova M Sh , Aliev S A , Murtazaev S-A U , Saidumov M S , Gabazov I A
Published: August 2020

In this paper, we substantiate approaches to the transition to clinker-free binders and building composites with their use to replace resource-intensive cement, at least in those areas of construction where its high technical functional properties are not needed. The optimal formulations and properties of alkaline activation binders based on mineral powders are revealed and the theoretical foundations of the formation of the structure and strength of cement stone based on an alkaline activator are revealed. The results of the studies are of practical value for the construction industry, as the obtained formulations of clinker-free cements will partially replace expensive and energy-intensive Portland cement in the production of concrete and reinforced concrete structures. This work was carried out as part of research on the implementation of scientific project No. 05.607.21.0320. “The development of technology for new building composites on clinkerless alkaline binders using substandard natural and secondary raw materials” that received support from the Federal target program “Research and development in priority areas for the development of the scientific and technological complex of Russia for 2014–2020”.
Study of changes in strength properties along section thickness of high-strength centrifuged and vibro-centrifuged concrete
Authors: Stelmakh S A , Scherban E M , Korobkin A P , Tkacheva K E , Osadchenko S A , Kadrov A A
Published: August 2020

Improving the efficiency of precast concrete products and structures can be achieved by creating thin-walled products of effective cross-sections from high-strength concrete the formation of which requires application of centrifugal methods of compaction. The paper discusses literature data on the issue of forming the structure of centrifuged concrete by the thickness of the section wall, taking into account different densities of the components of the molded concrete mass under the action of centrifugal forces during mold rotation during concrete compaction at a constant speed. The authors conducted a series of experimental studies to establish the nature of the change in strength properties along the thickness of cross section of products from heavy concrete made by centrifugation and vibrocentrifugation. As a result of experiments, it was found out that the density of samples of centrifuged structures decreases in cross section from the outer layer to the inner one. The greatest values of ultimate strength under axial compression and tension during bending are characterized by the outer layer, the smallest are characterized by the inner layer. The middle layer in terms of strength indicators is close to the average strength of the whole product. A feature of changes in compressive and tensile strength during bending of vibro-centrifuged products and structures compared to centrifuged layers is a smaller difference between the outer and middle layers and a significant difference between the outer and inner layers. It was established that the variability of the structure of high-strength concrete is less pronounced compared to the lower-grade concrete.
Assessment of the geomorphological basis of landscapes of the Crimean Peninsula using geoinformation technologies
Authors: Tabunshchik V A , Kluchkina A A , Petlukova E A , Kalinchyk I V , Galkina M V , Penno M V , Nikiforova A A
Published: August 2020

The goal is, based on modern methods of geoinformatics and geomatics, to assess the landscapes of the Crimean Peninsula for tourism using a set of indicators characterizing the expressiveness of the geomorphological basis: the absolute height, steepness of the slopes, the depth of the relief and the density of the dissection of the relief. Organization and research methods: assessment of the landscapes of the Crimean Peninsula by a set of indicators characterizing the expressiveness of the geomorphological basis was carried out using the Quantum GIS (QGIS) software package by creating a series of maps reflecting the geomorphological characteristics of the relief and their subsequent overlay analysis for each of the landscapes of the Crimean Peninsula. To create maps and obtain indicator values, geoinformation, cartographic, and cartometric research methods were used. The data obtained for each landscape were further processed by statistical methods using the statistical calculation environment R and the Statistica 10 program. Results: the values of the absolute height, slope steepness, depth of the dismemberment of the relief and the density of the dissection of the relief were calculated for each landscape of the Crimean Peninsula. In addition, by implementing statistical methods, zoning of landscapes of the Crimean Peninsula was carried out using a set of indicators characterizing the expressiveness of the geomorphological basis.
Suggestions for improving the organization of underwater search and rescue operations in hard-to-reach areas
Authors: Talirovsky K S , Shidlovsky A L , Lapin A N , Khasikhanov M S , Malaev M D , Dzhankhotov A A , Khamsurkaev Kh I , Butaeva Kh K
Published: August 2020

The inability of vehicles in some cases to deliver lifeguards and equipment to hard-to-reach places has contributed to the development of the idea of using horses in such situations. It would not be difficult for horses to overcome places considered difficult to access, and this work would be done in a much shorter time. In this case, divers would not have to engage in heavy physical labor to carry weights. The developed methods of horse training and rescue training were tested, which confirmed the research of specialists.
Alternative refrigerants with low global warming potential for refrigeration and air-conditioning industries
Authors: Tsvetkov O B , Laptev Yu A , Sharkov A V , Mitropov V V , Fedorov A V
Published: August 2020

Historically the use of natural and ecologically safe refrigerants was a strategy to eliminate environmental problems and avoid uncertainties with synthetic replacement fluids. Since ammonia is toxic, carbon dioxide provide high pressure, and the hydrocarbons are flammable, the general conclusion is often drawn that natural fluids gave safety problems. This paper will describe the possibilities of application as working fluids in refrigeration, heat pumping and organic Rankine cycles of the hydrofluoroolefins (HFOs) as alternative refrigerants with low global warming potential.
Mathematical modeling of the transmission pipeline under the influence of earthquake seismic waves
Authors: Zaripov D M , Khizbullina S F
Published: August 2020

The stress-strain state of an underground transmission pipeline under the action of earthquake seismic waves is considered. The main objective of this study is the construction of a mathematical model with the analytical solution for lower estimation of the influence of earthquake seismic waves on the transmission pipeline. The spectra of the design seismic actions of the earthquake are determined on the basis of parameters of real seismograms of past earthquakes. The generalized functions of seismic impulses are constructed. The transmission pipeline is modeled by a thin bar. Equations of pipeline motion using the Laplace transformation in time are solved, stresses are determined. The numerical example is considered. The results of calculations on the theories of Kirchhoff and Timoshenko are compared. Graphs of stress changes depending on the earthquake’s strength in points are given. The limiting value of the earthquake magnitude resulting in large stresses and deformations is determined. As a result, the transmission pipeline is destroyed.
The prospect of creating of the plant for the production of liquid fuel from coal in territory of Eastern Siberia
Authors: Zott R S , Konyuhov V Yu , Gladkih A M
Published: August 2020

In this work the shortage level of oil and gas is considered. Receiving various products from coal, exceeding prime cost of mineral raw materials in tens of times. The prospect of creation of the plant of receiving synthetic fuel from coal in territories of Eastern Siberia.
On the use of geophysical research data aiming to increase the efficiency impact on the bottomhole zone of wells
Authors: Mukhametshin V V , Kuleshova L S
Published: August 2020

Under the conditions of terrigenous Jurassic deposits in Western Siberia, we conducted a study on the influence of depositsʼ geological structure features, reflected by the results of geophysical surveys of wells on the effectiveness of the impact on the bottomhole zone using the hydrochloric acid composition Aldinol-20. It was established that in predicting the effectiveness of the impact on the bottomhole well zone, it is necessary to use the data of geophysical studies. At the stage of putting the field into development, it is enough to limit this information in the absence of it. The article proposes a technique that allows us to solve the tasks at different stages of development. The technique is based on the use of geological and statistical models and it is built based on using various performance criteria for various amounts of information. It is to be conducted in the conditions of a limited amount of information about deposits due to insufficient volumes of field research of organizational and financial nature, as well as in case of changing the tactics and strategies of enterprises in market conditions.
Development of oil deposits in tectonic conditions
Authors: Salimov F S , Kotenev Yu A , Mukhametshin V Sh , Sultanov Sh Kh , Safiullina A R
Published: August 2020

The paper presents the detailed analysis of structural and tectonic structure of the foundation surface and Jurassic deposits of Western Siberia, which allows identifying complex, small-sized geological objects promising for the detection of small oil deposits, clarifying the location of exploration wells, searching for deposits in subvertical destruction zones in deposits of the middle and lower Jurassic, foundation rocks in territories with already discovered overlying oil deposits. The zones of excessive fissuring, connected, among other things, with the zones of horizontal shear, which made it possible to change the expected contours of existing deposits and to reveal perspective excessive fissuring zones.
Assessment of professional risks in the operation of mud pumps
Authors: Shangareev R R
Published: August 2020

Assessment of professional risks in the performance of basic technological operations in drilling oil and gas wells is today an important scientific and practical task in the field of labor protection. The article discusses the main negative production factors that lead to damage to the health of workers during the operation of the mud pump. To exclude injuries, employees should have information about the main occupational risks in carrying out technological operations and have the competence in labor protection and production safety. The conclusion is drawn on the need for further scientific research in the field of analysis and assessment of professional risks in the drilling of oil and gas wells.
Optimization of the design of the scrubber separator slug catcher
Authors: Suleimanov R I , Khabibullin M Ya
Published: August 2020

The article discusses the equipment of a system for collecting and preparing well products. The equipment is made in the form of a slug catcher separator, the design of which is the product inlet capacity. Its main element is a cyclone-type scrubber with a swirl, in which the product is separated into gas, liquid and impurities. As a result of design optimization, the entrainment coefficient and the degree of product purification are improved.
Influence of complicating factors on the operation of an electric centrifugal pump installation
Authors: Suleimanov R I , Khabibullin M Ya , Suleimanov R I
Published: August 2020

The article analyzes the complicated stock of producing wells equipped with electro-centrifugal pump installations in an oil field. The study identified factors causing complications in oil production. In the course of the study, a complicated well stock was examined, and possible ways to prevent the formation of complications during the operation of oil producing wells were studied. The article presents well performance indicators that reflect the factors that complicate the operation of electric centrifugal pump installations. It developed recommendations to improve the condition of the complicated deposit fund.
Dynamics of the oscillatory system of the near-bit slurry grinder
Authors: Zaynagalina L Z
Published: August 2020

The article proposes a near-bit device for vibrodynamic grinding of sludge in a horizontal section of a well – a near-bit sludge shredder, its advantages are given. Theoretical studies of the dynamics of the near-bit sludge grinder oscillatory system depending on the main geometric design parameters are presented. Based on the solution of the mathematical model of the operation of the oscillatory system of the slurry grinder, the law of the relative rotation of the drum-mesh and its angular velocity of rotation relative to the shaft of the turbodrill (bottom of the drilling tool) is established. According to the results of solving the equation of motion of the working elements near-bit slurry grinder, the dependence of the amplitude of the angular velocity of the relative vibrational rotation of the drum on the stiffness of the springs and on the moment of inertia of the drum is established.
The architectural heritage of the second half of the 1940s - 1950s in the context of humanization processes and urban aesthetic comfort (on the example of Rivne city)
Authors: Isupova M I
Published: August 2020

In recent decades, a lot of ecological, ergonomic, functional, planning and aesthetic problems have emerged in most cities of Ukraine and the world, the elimination of which involves the architectural environment humanization. The article is devoted to the study of the architectural heritage role in the context of the urban environment humanization processes and modern approaches to providing aesthetic comfort. On the example of Rivne city, the method of public opinion polls establishes specific features of the architecture, which, according to the residents of the city, provide aesthetic expressiveness of the architectural space.
Mobile housing on the islands in post-industrial Dnieper
Authors: Myronenko V P , Tsymbalova T A , Myronenko O V
Published: August 2020

Mobile housing has extensive experience in various regions of the world. The popularity of mobile housing is due to the practical advantages of their designs and universal application in various functional typological areas. The use of mobile residential structures in Ukraine has significant prospects for the development of the tourism business, in particular, with the recreational development of the islands. Analysis of the possibilities of using mobile housing in the natural-landscape potential of the islands of the post-industrial Dnieper. The study is based on an integrated approach – application of general scientific and applied methods: the study of literary sources regarding the historical experience of using mobile housing, historical and local history heritage, modern scientific developments and state regulatory documentation; photofixations, experimental modelling. The Dnieper islands constitute a significant part of the recreational and tourist potential in the structure of the complex landscape zone of the modern Dnieper city. The use of recreational mobile residential facilities with the possibility of their placement on the islands and in coastal waters is proposed. The use residential technologies for organizing recreational and tourist activities on the Dnieper islands seems promising, since it is based on the concept of an ecological approach to the recreational load on natural landscapes.
Thesaurus of Parametric Formation Paradigm Architectural Space
Authors: Sopov D , Protsenko E , Mironenko V
Published: August 2020

The realities of the existing ecological crisis raise the question of the need to create new methods in the approach to the design of an architectural habitat adapted to the surrounding nature. The paper discusses the principles and approaches of biomimetic design of the architectural environment, taking into account the ecological state of nature in Ukraine. At the same time, we are talking about the creation of a completely isolated, self-sufficient, self-contained ecosystem that will fully meet all the necessary requirements for the biological functioning of the human body and includes the natural environment with residential objects harmoniously embedded in it. The solution to these questions is possible with the integrated use of modern design methods in an adaptive architecture environment.
Multi-Level Viewing Points in the Urban Structure of a City
Authors: Kuzmych V , Petrovska Yu
Published: August 2020

The authors of this research substantiate the statement that the proportional capture of the visual plane of the city panorama will be in constant dynamics in the context of both the planar expression and 3D observation of the volumetric solution of the spacial combination. A constant change of the viewing angle provides for the limitless quantity of viewing points concentrating on a cumulative picture of the angular perception. The article covers applied aspects of design and perception of the vertical and horizontal sector of capturing of the viewing panorama allowing obtaining multi-proportional correlations of the diagonal perspective and plane that in its turn impacts the general perception of the urban structure as a whole. The paper shows the importance of the spherical and angular range of the visual location that impact the psychological aspect of perception of the architecture as a whole, describes the dimensional and scale comparison of the main functional zones of a city, activation and concentration of accents of its mass with respect to the area of the general layout with addition of angular aspects of gravitational laws and identification of fundamentals of the linear and tonal perspective.
Innovative Approaches in the Period of Mass Industrial Development (on the Example of Residential Areas of Kharkiv)
Authors: Buriak O , Vihdorovich O , Gayevyi Y , Golovchenko A
Published: August 2020

The article considers architectural, city planning, engineering and technological innovations in the building industry that were carried out in Kharkiv in the 1960-1980s and led to profound changes in the social organization of city life. During these years, Kharkiv confirmed its reputation of the scientific and technical capital of Ukraine in the field of architecture and city planning. The most important innovations that were worked out in Kharkiv as in one of the largest cities include the microdistrict system, a stepped public service system, and the focusing method in city planning. It was also innovative to create standard series of residential buildings for mass industrialized development at Kharkivproekt and Ukrmistobudproekt institutes. Technological innovations were created in high-tech house-building plants, organizational and managerial ones – in managerial combines capable of coordinating the entire project and investment cycle. Mass industrial residential development in the mid-1980s allowed liquidation of the housing crisis in Kharkiv. However, this period gave rise to a number of problems in functioning and maintenance of the huge residential areas created at that time. Analysis and objective assessment of the achievements and mistakes of the era of mass industrial construction is a task of current interest for Ukrainian architectural science.
Innovative Component in the Creation of the Most Outstanding Greenhouses in the World of XIX - XXI Centuries. At the Junction of Architecture and Engineering
Authors: Kachemtseva L. , Khoroian N. , Gella O. , Nikiforova S.
Published: August 2020

The article examines the innovative contribution of architects and engineers to the design and construction of “translucent architecture”. Examples of the most outstanding greenhouses since the middle of the XIX century to the beginning of the XXI century, as well as materials on projects, realizations and modern use of these constructions published in the public domain are considered. Particular attention is paid to the facts of professional success from the biographies of architects, engineers and entrepreneurs who created innovative buildings of “translucent architecture” during this period. It is concluded that the latest architectural and constructive solutions are connected with the paradigm shift in the XXI century, modern scientific achievements and high-tech engineering. The source of inspiration for the transfer of natural principles in architectural solutions are the factors of the latest innovative achievements of architecture and civil engineering.
Visual-communication environment of a modern city
Authors: Dubinskiy V P , Nesen A A
Published: August 2020

The article aims at presenting an updated outlook on theoretical developments on the space of a modern city focusing on the formation of new dynamic environments, in particular the formation of a new object of the architectural space of a modern city – a visual-communication environment. The analysis of the research on the problem allowed authors to define conceptual issues of the subject of the research corresponding to modern world trends and scientific terminology. For the further emphasis of main subject of the research, the definition of the visual-communication environment of a modern city has been suggested. The importance of developing a comprehensive master plan of visual-communication environment of a modern city as the basis for possible solution of a number of problems of modern large cities has been determined. In addition, the definition and characteristics of the main structural parts of the comprehensive master plan of the visual-communication environment of a modern city (visual-communication frame, visual-communication outline) have been given. These categories allowed to reveal the nature of the visual-communication environment reflecting its compositional features.
Influence of genesis of mineral components of asphalt concrete for its durability in aggressive environments
Authors: Yefremov Sergii
Published: August 2020

The results of determining the durability of asphalt concrete are presented by the method developed at the Department of Technology of Road-Building Materials and Chemistry of KhNADU. The features of the resistance of asphalt concrete on various rocks by the influence of liquid aggressive environments are shown. The coefficients of stability of asphalt concrete to the action of liquid aggressive media on asphalt concrete from mixtures of monomineral compositions made from various rocks are determined. Thus, despite the difference in the origin of the rocks that make up the asphalt concrete, a long service life of road coatings based on them can be ensured, which in turn can ensure high profitability of using these coatings even on roads with heavy traffic and difficult conditions exploitation.
Resource saving and energy saving at the simultaneous production of two types of cement
Authors: Riazanov A A , Vinnichenko V I , Riazanov A N , Rakhimov R Z , Nedoseko I V
Published: August 2020

Modern trends in the development of the global cement industry are to reduce the energy intensity of production and reduce the environmental burden on the environment. These goals can be achieved by using fuel-containing man-made waste in place of natural raw materials and fuel. Great decrease of fuel costs by 20-40 % when making Portland cement is shown to be achieved by combining calcination of both Portland cement clinker and carbonate-silica mix in one heat and technological cycle to get cements with low-temperature calcination. Extra heat effect is achieved by adding combustible industrial wastes, like ashes from power plants or coal waste, to the raw mix to get cements with low-temperature calcination. Further modification of lime-silica cements obtained by Portland cement clinker within 20-40 % range by weights is shown to get mixed product with strength indices in sand mortar corresponding to 0,6-0,8 grade strength of original Portland cement. Combined method for making two kinds of binders is shown to reduce carbon dioxide by 22-60 % calculated as the final modified product as compared with traditional making of Portland cement clinker. When substituting 50 % of clinker part by cements with low temperature calcination with certain composition, grade strength of the mixed product is similar to Portland cement indicators.
Temperature-time monitoring of concrete hardening of a wind farm foundation
Authors: Kabus O V , OKulaienko O , Ryabushko A V , Sopov V P , Usherov-Marshak O V
Published: August 2020

The foundations of wind farms are massive structures that require temperature control of concrete hardening during their construction. This is due to the need to ensure crack resistance and specific operating conditions of engineering networks located in the body of the structure. The work describes a comprehensive study of the foundations construction on the Zaporizhzhya wind farm. The study included calorimetric analysis using adiabatic calorimetry and on-site temperature monitoring of the object using a continuous temperature measurement system. Laboratory studies allowed verify the composition of concrete proposed by the concrete manufacturer and develop recommendations for concreting. The data obtained showed that the hardening conditions approach adiabatic ones with a foundation slab thickness of more than 2.5 m. This leads to a temperature gradient of more than 25 ° C between the internal and external parts of the structure. The adopted recipe and technological solutions have ensured the achievement of acceptable conditions for the foundation slab construction in the winter.
Special Features of Using Universal Technological Sets of Small-sized Equipment for Renovation of Buildings
Authors: Emeljanova I A , Chayka D O , Lebedeva E S , Subota D Yu
Published: August 2020

Nowadays, old utility lines are the most critical issue of society. Emergency condition of these utility lines results in their destruction and pollution of ecosystem and imposes threat to life of people residing within risk area. This article offers variants of mobile universal sets of small-sized equipment that allows restoration of destructed and emergency buildings through wet-mix shotcreting process. The universal nature of these sets of equipment allows performance of entire scope of renovation works from preparation of damaged surfaces to applying anti-corrosive coatings. Upon the use of such sets of equipment, it is possible to prepare and lay construction mixtures of different purpose directly at the place of works. Combination of process operation in time enhances the efficiency of equipment and reduces power consumption.