bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the solubility of antracene in pure and modified supercritical carbon dioxide
Authors: Khazipov M R , Pastushenko I L , Sagdeeva G S , Sagdeev A A , Galimova A T 
Published: December 2019

Abstract
In the framework of the supercritical fluid extraction regeneration of catalysts, an original experimental device was created for measuring the solubility of substances in pure and modified supercritical carbon dioxide, protected by a RF patent for a useful model. To prevent entrainment during the implementation of the process of extraction of substances in the solid state, a special vessel with a microporous membrane was used in the extraction cell. The solubility of anthracene in pure supercritical carbon dioxide was studied with 423, 435, 448 K isotherms in the pressure range from 9.6 to 22 MPa. It is established that an increase in temperature and pressure contribute to an increase in the solubility of anthracene. In order to increase the dissolving ability of SC-CO2, a search for modifiers of various nature (acetone, hexane, ethanol) was conducted. It is revealed that hexane and ethanol are more effective modifiers. In this regard, the effect of the concentration of these modifiers on the dissolving ability was investigated. The content in the solvent 2% of the mass. hexane and ethanol have a maximum effect than their other concentration. The solubility of anthracene in SC-CO2 modified with hexane and ethanol was studied at a 435 K isotherm in the pressure range 10-20 MPa. The use of modifiers made it possible to increase the solubility of anthracene using ethanol and hexanan by 56% and 76%, respectively. The solubility of anthracene in pure supercritical carbon dioxide is described using the Peng-Robinson equation of state and three adjustable parameters. To describe the solubility of anthracene in a modified SC-CO2, only one adjustable parameter was used. In addition, the descriptions of the solubility of anthracene in pure SC-CO2 obtained experimentally in this work and in the works of other authors are presented. The obtained dependences of the parameters of the binary interaction on temperature make it possible to interpolate the values of solubility on the basis of existing experimental data.
Study of microrelief forming technology on sliding bearings for oil and gas centrifugal units
Authors: Petrovsky E A , Bashmur K A , Shadchina Yu N , Bukhtoyarov V V , Tynchenko V S 
Published: December 2019

Abstract
The present paper is dedicated to improving the quality, reliability and operational characteristics of machines that is a major challenge for modern oil and gas engineering. Improving the quality of machines, increasing their reliability and durability is inextricably linked with the issue of enhancing the parts surface quality as virtually all operational parts properties are determined by certain geometric and physical-chemical parameters of their working surfaces. In particular, there is a known way to increase the reliability of supports of centrifugal units when sliding bearing supports with a regular microrelief are used. In particular, there is a known way to increase the reliability of bearings of centrifugal units when sliding bearing bearings with a regular microrelief are used. When researching the planetary rotary turning the tool is given additional movement - planetary rotation, it is found out that the complicated movement of planetary rotary turning provides an emerging various regular microreliefs on the surface of the parts that can be effectively applied to sliding bearings. The article focuses on the study of the kinematics of this relief by planetary cutting tools.
Self-contained process module with flow swirling for downhole equipment power supply
Authors: Bashmur K A , Petrovsky E A , Shadchina Yu N , Tynchenko V S , Tsygankova E V 
Published: December 2019

Abstract
The present paper is dedicated to the development of resource-saving technologies for oil and gas complex, namely to the development of power supply for downhole equipment. The relevance of this research is caused by the acute lack and high electricity costs for downhole devices which are widely-used both in drilling and in hydrocarbon production. The traditional methods used to power these devices, namely batteries and power cables are unreliable and short-lived and they require capital and time expenditure for production process, tripping operations, etc. shutdowns. There is a solution to this problem consisting in use of autonomous downhole power supply system including a hydrodynamic module with an electric power generator which converts well flow energy. An assessment of the device operability was made in which its high performance is highlighted.
Processing capabilities of reducers with eccentric gearing for rotary drilling rigs
Authors: Petrovsky E A , Bashmur K A , Geraschenko Yu A , Tsygankova E V , Bukhtoyarov V V 
Published: December 2019

Abstract
The present paper is dedicated to assessment of possibilities for using reducers with eccentric involute gearing in the system of the drilling rig top drive. Modern problems of top drive systems, in particular disadvantages of applied reducers are considered. The kinematics of eccentric gears is investigated; the main characteristics of the proposed gearing are calculated. High gear ratios and efficiency of the mechanism with its low weight and dimensions are revealed.
Regularities of change of energy indicators of the basic technological equipment of the cotton-cleaning industry
Authors: Rakhmonov I U , Reymov K M 
Published: December 2019

Abstract
The article discusses the change in electrical loads and specific power consumption during the processing of various varieties of raw cotton. A method of evaluation changes in energy indicators and the influence of normative factors and identifying reserves of energy savings is attached. The most favorable modes of operation of the main technological equipment from the performance of power-consuming objects have been evaluated by using the Chebyshev method. As an example of the implementation of the proposed method, calculations have been performed at the Peshku cotton processing plant in the Bukhara region.
Research of textural and structural features of refractory gold-bearing ores
Authors: Gron V A , Korostovenko V V , Galaiko A V , Sukhanova A V , Gron M S 
Published: December 2019

Abstract
The article studies the material and mineralogical composition of the refractory gold-bearing ores of the weathering crust of one of the deposits in Eastern Siberia. It is revealed that, according to the textural and structural features, ores are multi-mineral and have significant differences in the composition of the detrital, granular material and the loose component. All ore is saturated with iron hydroxides and limonite crusts with clay components. The results of the analysis showed that large classes contain an insignificant amount of a valuable component. Increased gold content is noted starting from -4 + 0 mm size. In the free state are about 3-5%. Processing of these types of raw materials is a rather complicated task. Analysis of the enrichment methods showed that the use of new solvents of noble metals with their subsequent concentration is promising. Of practical interest are alkaline solutions obtained by dissolving sulfur in an aqueous suspension of calcium hydroxide. The reagent is non-toxic and environmentally friendly. Leaching was carried out in a wide range of concentrations of the solvent used. The optimum solvent concentrations and the duration of the leaching process for extracting the valuable component into the filtrate were determined to be 97–98%. Chemical analysis of cakes showed that the reagent does not enter into chemical interaction with other elements that make up the ore. As well as the content of elemental sulfur in dump cakes averages 0.64%, that is, it corresponds to a content in the raw material of up to 0.8%. At the same time, cakes are not environmentally harmful and can be stored on special platforms.
Low-intensity vibration impact on a low-permeable coal seam
Authors: Pavlenko M V , Arnautov A D , Tsarev R Y , Orlova V V , Kartsan I N , Zhigalov K Y 
Published: December 2019

AbstractWith a sufficiently high level of degassing works in the mines of a number of coal basins, their effectiveness is constrained by specific properties of the coal seams being mined. In particular, the filtration and reservoir properties of fossil coal differ significantly, in natural conditions, even within one coal seam. The article outlines the purpose of the new method, namely, the vibration impact on the coal seam to increase fracturing and as a consequence of increasing the gas recovery intensity. In this way, when mining a low-permeable gas-saturated coal seam, the gas recovery rate is very low due to the physical state of the array. Existing methods create insufficient conditions for the degassing of coal seams. Therefore, to increase the efficiency of the coal array it is required to create new, more efficient ways to crack open fractures and increase gas recovery from coal. This is achieved by applying vibration to a low-permeable gas-bearing coal seam.
Combined heat and power
Authors: Bamatov Ibragim M , Bamatov Dzhabrail M 
Published: December 2019

Abstract
This research illustrates the co-generation process of electricity and fresh water (H2O) through the application of combined distillation power plants producing very high efficiency for the electricity generation and the available utilization of waste energy. Consequently, it increases the power of low temperature multi-stage distillation plants. This project is about Combined Heat Power (CHP) distillation process that gives the best environmental effect for the reduction of carbon dioxide (CO2) gases, which effects in water prices and yields pure water from the distillation process. Besides, this report includes economical and practical factors, which are taken with consideration of the feasibility of CHP. The factors affecting within choose of the power plant and the overall system economics are additionally discussed and analysed.
The use of magnetic flaw detection to control the offset of the edges of the welded joints of technological pipelines
Authors: Naumkin E A , Rubtsov A V , Kulakov P A , Usachev K A 
Published: December 2019

Abstract
The task was set of developing recommendations for identifying areas of displacement of the edges of the welded joints of abutting pipes, as well as identifying potentially dangerous sections of welded joints of technological pipelines by changing the normal component of the constant magnetic field. For research, 24 pipe fragments made of steel 20 with a length of 45 mm each were selected. The authors developed recommendations for identifying the presence and zone of displacement of the edges, as well as identifying potentially dangerous sections of welded joints of technological pipelines using the flux-gate control method. It is proposed to use the obtained maximum values of the normal component of the constant magnetic field for the objective detection of edge displacement zones and the determination of potentially hazardous areas. It was shown that the normal component of the constant magnetic field, is quite sensitive both to the displacement of the edges of the welded joints of the pipes and to the quality of the weld, its geometry, defectiveness and determines the above indicators with various characteristic values.
Purification of harvested tree stumps by means of pulse swirling hydraulic jets
Authors: Polyanin I A , Nikonorov K N , Egorov A V , Voldaev M N , Lysyannikov A V , Kaizer Yu F , Stepanova K S 
Published: December 2019

Abstract
The article deals with the separation of soil, bark and rot from the surface of the tree stump before its further use in the production of turpentine and rosin. Developed and manufactured installation for experimental studies of the operating parameters of pulse swirling jets of liquid under the influence of the treated tree stump. In general, the dependence between the parameters of the pulse swirling liquid jet and its impact on a stationary object is revealed. In general, the dependence of the influence of the initial parameters of the pulse swirling hydraulic jets on the width of the treated surface of the harvested stump when removing soil, bark and rot is established. The convergence of theoretical and experimental data for determining the width of the treated surface of the harvested stump by pulsed swirling jets of liquid is estimated, the maximum divergence of 3.0 % in determining the width of the treated surface when removing rot.
Improving the energy performance of ozone generators used in agricultural ecology
Authors: Radjabov A , Ibragimov M , Eshpulatov N M , Matchonov O 
Published: December 2019

Abstract
In order to improve the energy characteristics for low-power ozone generators, it is proposed to use a continuous discharge burning mode. It is due to a significant phase shift between the currents and voltages on the ozone generator. Conditions for conducting the continuous discharge mode were identified.
Possible use of processed ferromanganese concretions for production sewage purification
Authors: Sulimova M A 
Published: December 2019

Abstract
This article describes a possible scenario for ferromanganese concretions usage as a sorbent for purification of wastewater obtained from mining enterprises. To study the chemical and physicochemical properties of iron-manganese nodules, the methods of tomography and X-ray phase analysis were applied. The data obtained during the experiments can be used for a more detailed study of ferromanganese nodules of various deposits, for their use as a sorbent.
Estimation of seismic load to the oil pipeline with manholes
Authors: Bayazitov M I , Berdin V K , Kulakov P A , Afanasenko V G , Bayazitov R M , Tlyasheva R R 
Published: December 2019

Abstract
Estimation is to predict the outcome of seismic load to underground pipeline with manholes. Forces and shears were taken into account during modelling of seismic resistance. There were 3 types of waves identified in this job, and the estimation of the maximum velocity of the soil movement was made according to the category of soil by seismic properties. The seismic resistance was estimated under the action of both horizontal and vertical directions of seismic load. The model of a manhole was created from scratch by authors. The main supporting elements of the body were modelled in a stress-deformed mode. The transmission of seismic longitudinal P-waves was simulated with parameters up to 9 points inclusive at the MSK-64 scale in soils of medium density. Based on the analysis of the data obtained, a graph of maximum equivalent von Mises stresses was built depending on the phase of the seismic longitudinal P-wave transmission. Conclusions were made about the efficient usage of applying the proposed approach to solve this class of problems.
Static and dynamic approach to estimation of spring water mineralization stability as a factor of groundwater ecological safety
Authors: Vasyukov A E , Korzhavyi A P , Nikulina S N 
Published: December 2019

Abstract
To assess the degree of influence of technogenic factors on the groundwater mineralization, it is proposed to consider simultaneously in a static and dynamic position the results of conductometric determination in spring water of generalized indicators, such as electrical conductivity and the coefficient of identification of the mineral composition of water. This is shown by the example of four springs located in the territory of Kaluga. This made it possible to establish the average annual background values of electrical conductivity and the coefficient of identification of the mineral composition of water, as well as to justify the permissible or weakly expressed degree of influence of technogenic factors on the quality of groundwater in the period from November 2017 to October 2018 by the criterion of exceeding the error of the conductometric method (2%) by 3 or more times.
On the formulation and solution of the boundary value problem of drilling well by differently mounted drilling bits
Authors: Kolotvin A V , Ganin E V 
Published: December 2019

Abstract
The tensity of the drilled rock under the influence of two circular and annular drilling bits rotating in opposite directions is of profound interest. The aforecited method solves the problem of spin moment removal from the drill string. Assessment of the tensity determines the formation stimulation during drilling. Inasmuch as the drill bits are circular in the axial plane of the aperture, the elastic strain range is not simply-connected. To solve this problem, it is proposed to consider the equations of the elasticity theory in a toroidal coordinate. This statement corresponds to the axisymmetric torsion problem articulated by A.I. Lurie [1]. The task is formulated and solved in the displacements indicating the subsequent transition to tensions. An outstanding feature in comparison with the Laplace equation is the presence of an additional summand. The boundary conditions are displacements’ equality to zero on the axis and on the walls of the aperture. Then an additional solution of the problem is carried out in a cylindrical coordinate, shifted to the bottom of the slaughter. Two solutions are compared.
The refined method of risk assessment of the technical condition determination of the aviation equipment critical elements
Authors: Korshunov G I , Polyakov S L , Nurushev E T , Smirnova V O 
Published: December 2019

Abstract
The accuracy of the critical systems assessment of aviation equipment is paramount importance. The paper proposes a method of risk assessment, based on combined statistical methods, in the technical condition determination of the aircraft critical systems. The application of FMEA-analysis technology is considered in order to improve the accuracy and reliability of the obtained values. This technique can be useful for refining the resulting indicator in the presence of different emissions in total set of estimates.
Impact of undissolved gas on dynamic processes in the fluid drive for well testing and servicing research
Authors: Lunev A S , Nikitin A A , Afanasov V I , Kaizer Y F , Lysyannikov A V , Dunaeva S P 
Published: December 2019

Abstract
This paper concerns topical issues because power oils for a hydraulic drive are the mixture of liquid and undissolved gas. This mixture can arise when tanking and during dynamic processes because of the different dissolution and evolution rates of gas in a pressure fall in some spots of power fluid flow. That is why this paper deals with the impact of the gas factor on the behavior pattern of fluid. When describing the processes fluid drive was considered as a lumped parameters system.
Hydromechanical devices to prevent paraffin deposits
Authors: Feodorov A B , Afanasov V I , Lunev A S , Spirin T S , Kurochkin E S , Zagorulko A J 
Published: December 2019

Abstract
The focus is on paraffin deposits on the walls of the tubing. Devices will be analyzed to prevent them. The conditions of hydrocarbon deposits in Eastern Siberia are considered. Hydrocarbon fluid is in critical condition. Small changes in physical parameters lead to the launch of phase transitions. Such changes take place in the process of lifting the liquid to the surface. There is a drop in pressure and temperature. Natural gas is released and, as a result, conditions are formed for the precipitation of paraffin crystals. The adsorption capabilities of the tubing wall contribute to the initiation of paraffin deposits. Among the units designed to prevent this problem stand out hydrodynamic devices. Due to the creation of cavitation zones, local formation of crystallization centers is provoked. Moreover, these lacunae are in the stream, i.e., separated by a moving fluid from the pipe wall. These circumstances contribute to the removal of the resulting paraffin crystals up to the surface. At times, labor costs for cleaning the pipe walls from paraffin deposits are reduced. An important advantage of hydrodynamic devices such as swirlers, cavitators is the absence of moving parts. This ensures reliable operation and ease of modernization. Of interest is the property of device casings to keep clean from paraffin deposits. This circumstance is associated with concomitant vibration. Permanent shaking off of the rudiments of deposits occurs.
Research of methods for pumping technological equipment condition predictive monitoring
Authors: Bukhtoyarov V V , Tynchenko V S , Bashmur K A , Petrovskiy E A , Kukartsev V V , Bukhtoyarova N A 
Published: December 2019

Abstract
The article discusses the need to develop a diagnostic prognostic unit for certain types of technological equipment. Several well-known methods for predicting time series are considered: a method based on artificial neural couples, a method for analyzing a singular spectrum, an exponential smoothing method. A brief description of the methods under consideration is given. The parameters of the numerical study of the methods are described. The results of a numerical study are presented, the advantage of the neural network approach and the method of singular spectral analysis are shown.
The economy of a small innovative enterprise in the implementation of oil and wastewater treatment technologies
Authors: Gazieva I I , Biysultanova M A , Vizirova H R , Daudov I M 
Published: December 2019

Abstract
Each technological stage of technology is carried out on separate devices located indoors - a technological process of a closed hardware type. Such a process lends itself to automation, since each of the devices is technologically autonomous and can be replaced by another due to a malfunction or according to technological indications. In this way, high process stability and flexibility are achieved. All devices are of serial factory manufacturing, which ensures high quality, aesthetics and reasonable price parameters, as well as, if necessary, the ability to upgrade each unit individually. The hardware type of the technological process, being high-tech, energy-efficient and environmentally friendly, creates the prerequisites for a significant reduction in sanitary protection zones (2–6 times) and areas allocated directly to sewage treatment plants (7–8 times). In addition, it becomes possible to flexibly change the capacity of WWTP (increase or decrease if necessary), as well as introduce purification stages necessary for specific conditions or remove unnecessary ones, without compromising the integrity of the technology and the efficiency of wastewater treatment.