ENGINEERING, ENERGY, TRANSPORT AIC最新文献

{"title":"EVALUATION OF DEFORMABILITY OF MATERIAL DURING PLANTING OF ELEMENTS OF PREPARATIONS BY ROLLING STAMPING METHOD","authors":"V. Matviychuk, V. Mikhalevich, M. Kolisnyk","doi":"10.37128/2520-6168-2022-2-11","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-2-11","url":null,"abstract":"The article presents the results of development and research of technological schemes of planting flanges on tubular (ring) workpieces by stamping by rolling cylindrical and conical rolls. It is shown that the achievement of significant dimensions of the various elements of the workpiece is possible by providing a directed flow of metal by changing the relative position of the roll and the workpiece. Planting of external flanges is one of the most effective operations of stamping by rolling, as it allows you to form a wide range of products with advanced geometric elements. To assess the technological capabilities of the flange landing operation, the most dangerous from the destruction positions of the workpiece zone was identified and the analysis of the stress-strain state of the material using the method of grids, hardness measurement and microstructural analysis. According to the results of the research, the ways of deformation of the particles of the material of the peripheral surface of the flange in the coordinates \"intensity of deformations - an indicator of the stress state\" are schematically constructed. These deformation paths are given against the background of curves of ultimate deformations of steels, which are built on the results of uniaxial compression and torsion of cylindrical specimens and using tested approximations. A mathematical model of deformation trajectories is constructed, for which a one-parameter function is taken as a basis, which is \"glued\" from the elementary function of the sine and tangent to it at some point in the line. To determine the used plasticity resource, a damage summation model with a power approximation of the damage function was adopted. As a result, we have for the first time described the general expression of the linear damage summation model for the case of the parametric deformation path problem. The graphical representation on the constructed model of accumulation of damages in material of a dangerous zone of a flange at landing by a method of SHO is resulted. Based on the constructed model, it is possible to model the accumulation of damage by changing the values of the model parameters for different materials and deformation paths, which, in turn, depend on the relative geometric parameters of the workpiece and its location relative to the rolling roll.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133765787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF OPTIMAL DESIGN AND WORKING PARAMETERS OF A VIBRO-PRESS FOR DEHYDRATION OF DAMP DISPERSIVE WASTES OF FOOD INDUSTRY","authors":"I. Sevostianov","doi":"10.37128/2520-6168-2022-2-9","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-2-9","url":null,"abstract":"Vibro-pressing equipment its one from most effective kinds of machines for dehydration of damp dispersive wastes of food industry (alcoholic bard, beer pellets, beet press, coffee and barley slime) for their further using as valuable additives to agricultural fodders or as fuel. In comparison with other equipment for mechanical dehydration (hydraulic, belt and screw presses, centrifuges) vibro-presses with hydraulic pulse, unbalanced or electromagnetic drive provide the same or higher productivity (20 ÷ 25 t / h) and energy efficiency (2,7 ÷ 3,2 kW / t) under lower final humidity of processed wastes (20 ÷ 25% against 70 – 76% - in case of realization of other mechanical methods). The last advantage allows do not conduct an additional drying of the wastes and that provides significant decrease of general power consuming of the working process. For provision of high efficiency parameters of the vibro-blowing dehydration there is need to provide optimal values of working and design parameters of the equipment for their realization. There are several approaches for research of the vibro-press equipment. The approaches that realized with help of differential equations of movement of the machine’s executive elements or differential equations of balances their energy provide high accuracy of calculations but because of complexity of these equations they are unsuitable for creation of a method of engineering design calculation of the machines. In the article are proposed algebraic equations and formulas for definition of optimal parameters of the vibro-pressing equipment for dehydration of damp dispersive wastes of food industry for realization of given parameters of efficiency and with consideration of initial and final physical-mechanical characteristics of the processed waste. There are conducted calculated diagrams of these parameters.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"50 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120916641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CHOOSING A REASONABLE GRIP WIDTH OF ROTARY RAKES WITH CONTROLLED RAKES","authors":"Dmytro Kondratuk","doi":"10.37128/2520-6168-2023-1-5","DOIUrl":"https://doi.org/10.37128/2520-6168-2023-1-5","url":null,"abstract":"It is advisable to use rotary rakes with controlled rakes for raking hay in the windrows. On the agricultural machinery market of Ukraine, foreign companies offer models of rotary rakes with controlled rakes, which differ in the width of the grip from 2.8 to 14.0 m, the number of rotors and other features. This creates difficulties in choosing a rake with a rational width of grip. It is possible to choose the rational width of the rake, based on the estimated volume of hay harvesting in the farm and operational costs of money for the performance of mechanized work. It is obvious that with a rational grip width of the rake, operating costs will be minimal. The purpose of the work is to reduce operating costs when harvesting hay by developing an algorithm for choosing a rational rake width with controlled rakes. It was established that the given operating costs for hay raking decrease as the width of the catch increases from 3 to 6 m. At a width of 5-7 m, the minimum values are taken, and with further growth, the width of the grip increases. This is explained by the fact that with a small grip width of rakes, they have low productivity, which leads to relatively high operating costs. The increase in specific operating costs with a width of more than 6 m is associated with an increase in the cost of the rake. In order to reduce the cost of hay, it is advisable to use a rake with a width of 5 to 7 m for its raking. The necessary width of the rake can also be selected based on the estimated amount of hay harvested. Graphical dependences of the change in standard rake production (product of productivity per standard annual loading) on the width of the grip were obtained. It has been established that under the condition of one-time use of a rake with a grip width of 7 m, it will allow harvesting from 2,500 to 2,800 tons of hay per year.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124266597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESEARCH OF ENERGY-PHYSICAL AND THERMODYNAMIC PROCESSES IN AN ELECTRONIC DEVICE FOR OZONE SYNTHESIS","authors":"","doi":"10.37128/2520-6168-2022-1-13","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-13","url":null,"abstract":"","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116688926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF TECHNICAL AND TECHNOLOGICAL EQUIPMENT PROCESSES OF EXPANDED FEED PREPARATION","authors":"E. Aliiev, N. Linko","doi":"10.37128/2520-6168-2022-1-6","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-6","url":null,"abstract":"Extruders and expanders belong to the family of HTST (high temperature short-term) equipment capable of performing the task of cooking food and feed under high pressure. Because the effects of high temperatures occur only for a short time, the undesirable effects of denaturation of proteins, amino acids, vitamins, starch and enzymes are limited. Physical and technological aspects such as heat transfer, mass transfer, pulse transfer, temperature time have a strong influence on the properties of food and feed during extrusion and expanded cooking and can significantly affect the quality of the final product. The aim of the research is to analyze the technical and technological equipment of extrusion and expanded feed preparation processes and substantiate the feasibility of using expanders. The use of expanders in the feed pellet processing line has many advantages, the most important of which are: improved feed nutrition (better feed conversion); more efficient use of low-quality raw materials or even waste; sterilization of bacteriologically contaminated materials; better control of liquid additives; reduction of energy consumption of pellet press; increasing the productivity of the pellet press; expanding the product range; the possibility of using fibrous materials; reduction of dust emissions and losses during granulation. The economic and food aspects of the use of expanders make their use understandable and justified in the feed industry. The use of an expander-granulator kit increases the cost of production by 10-15 % compared to granulation alone. However, the overall income and expenditure account is positive due to the qualitative results that offset the costs incurred. The use of expanders in the global feed industry is growing every year, which is also reflected in the wider range of recently produced animal feed. The benefits of this technique are beginning to be appreciated in underdeveloped countries. Its usefulness is fully confirmed by feed manufacturers who have already implemented the above production methods.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125983359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"JUSTIFICATION OF THE STRUCTURAL AND TECHNOLOGICAL PARAMETERS OF THE ADAPTIVE THREE-PIPE HEAT EXCHANGER FOR ANIMAL ROOM","authors":"V. Yaropud, I. Kupchuk, S. Burlaka","doi":"10.37128/2520-6168-2022-1-17","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-17","url":null,"abstract":"As a result of the research, an adaptive three-pipe heat exchanger was developed, containing coaxially installed pipes, a condensate drain pipe, an exhaust shaft passing through the outer pipe, a supply fan, an exhaust fan, distribution openings, an air filter, and a duct electric heater. The adaptive three-pipe heat exchanger is additionally equipped with servo drives with dampers, temperature sensors, air velocity sensors installed on all distribution openings, an air quality sensor located in the room, a control unit that is connected to the supply fan, exhaust valve by means of signal wires. heater, servo drives, temperature sensors, air speed sensors and air quality sensor As a result of theoretical studies, confirmed experimentally (correlation coefficient R = 0.98), a method was developed and based on it an algorithm for determining the area of holes in the air duct of an adaptive three-pipe heat exchanger for livestock buildings was developed . It has been established that the distance between the holes gradually decreases to a certain value in the opposite direction of the air flow. However, there is a slight reduction in distance at the end of the heat exchanger duct due to the backflow of air that collides with the plugged end.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126386434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PROSPECTS FOR CREATING SURFACE LAYERS OF DETA-LEU WITH INCREASED TRIBOLOGICAL CHARACTERISTICS USING GAS-DYNAMIC FILLING","authors":"V. Matviychuk, Oleg Gaidamak, Mykhailo Karpiichuk","doi":"10.37128/2520-6168-2022-1-10","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-10","url":null,"abstract":"The article presents the results of the analysis of antifriction materials based on tin and lead, copper, aluminum, plastics. The advantages and disadvantages of one or another antifriction material, as well as the possibility of their application on the surface of parts by the method of cold gas-dynamic spraying, are shown. The use of liquid and solid anti-friction materials as lubricating oils is considered. Considerable attention has been paid to materials with the same crystal structure as graphite, now known as two-dimensional (2D) materials. Among these 2D materials, the most studied materials are MoS2 and a carbon-based compound, including graphite and graphene. The scheme of interaction of sliding surfaces is considered, including wear, molecular deformation, adhesion, thermal effect and the environment. Analysis of anti-friction materials showed that their application to the surface of parts can be carried out using the process of cold gas-dynamic spraying. The article shows a diagram and type of installation for cold gas-dynamic spraying of antifriction surface layers. For the research, copper-graphite powder with a particle size of 10,7 – 80,8 microns was used. Using the application \"Maso central characteristics\" of the software \"Compass-3D\", the mass of the deposited figure as a continuous material for copper-graphite coatings, with a density of ρ1 = 0,0086454 g / mm3, and the porosity of the deposited figure were determined. In the course of the study, it was found that, in comparison with the substrate material AA7075, the sliding friction coefficient was reduced by 47% - 62% for the copper-graphite surface layer. To obtain composite coatings, a mechanical mixture of A30-01 aluminum powder and C01-00 copper was used. The dependences of the coefficients of sputtering of copper and aluminum on the mass content of aluminum in the sprayed mixture at an initial concentration of aluminum of less than 66% are found. The copper deposition rate is higher than the aluminum deposition rate. Both monotonically increase with increasing aluminum concentration until it reaches 61%. At high concentrations of aluminum (more than 66%), the coefficients of deposition of copper, aluminum and their mixtures coincide.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126323844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AUTOMATED SYSTEM FOR DRYING SUGAR PRODUCTION PULP","authors":"O. Voznyak, I. Babyn","doi":"10.37128/2520-6168-2022-1-8","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-8","url":null,"abstract":"Sugar production is one of the most complex and energy-intensive. Conditions of high competition of modern reality bring to the fore such indicators as quality, energy consumption, cost. Such conditions dictate the need to apply the latest scientific advances in the automation of sugar production technologies.\u0000The automation of the sugar industry ensures high-quality, efficient operation of all technological sections of the sugar plant only through a comprehensive approach to solving this problem. One of the main problems in creating the ACS TP of the sugar industry is the stabilization of the flow line of the main product of sugar technology, as well as maintaining optimal levels of product stock in intermediate (buffer) collections of sugar technology. The technological complex of the sugar industry enterprise consists of areas of procurement, storage, preparation of raw materials for processing, departments of juice production, purification of diffusion juice, areas of finished product production, storage and auxiliary production.\u0000Increasing productivity in sugar factories, developing new technology to improve quality, increase the efficiency of sugar industries that require renewal, as well as improving management systems using modern measuring and automation tools.\u0000Automation of technological processes with the use of automated complexes, machines, mechanisms, modern means of automation and computer technology is one of the main directions of scientific and technological progress in all sectors of the economy.\u0000The analysis and development of the automated system of dispatch control of the drying process of pulp in sugar production is carried out in the work. The system is based on SCADA - Trace Mode 5.10 system manufactured by AdAstra. The result is a fully functional system that can be used in sugar production and the advantage of its implementation is to increase efficiency compared to existing systems.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132243231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INCREASING THE WEAR RESISTANCE OF ROAD TRANSPORT PARTS IN THE AGRO-INDUSTRIAL COMPLEX BY APPLICATION OF LASER DEPOSITION","authors":"Y. Kovalchuk, O. Pushka, Andriy Voitik, Andriy Kovalchuk","doi":"10.37128/2520-6168-2022-1-3","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-3","url":null,"abstract":"In this work, we studied the effect of laser melting and alloying elements (ТаВ, МоВ, B4C) on the friction coefficient and wear rate of plasma coatings of automotive parts in the agro-industrial complex under friction conditions both without lubricant and with lubricant.\u0000Under friction without lubrication, the main factors that determine the wear resistance of the part are the hardness of the alloyed layer and its chemical composition. The content of molybdenum, tantalum and boron carbide borides in the surface layer, which provide the formation of secondary structures separating the friction surfaces, has a favorable effect on the coefficient of friction, and, consequently, on the operational characteristics of the surface.\u0000As a result of the research, the following trend was revealed: coatings with a lower coefficient of friction also have the least weight wear and are the most wear-resistant. Alloying with tantalum boride increases the heat resistance of coatings, leads to grain refinement in them, and an increase in microhardness. Therefore, this coating can be recommended for operation in conditions of friction without lubricant and high pressures.\u0000Studies have shown that the wear resistance of coatings is affected by laser processing modes, contact load, the method of reflow of a gas-thermal coating, as well as its chemical composition. The choice of laser processing modes provides control over the structure and properties of coatings, and also affects their wear.\u0000Also, as a result of studies under friction conditions with a lubricant, it was determined that the coating after laser alloying with molybdenum boride has the lowest coefficient of friction and wear resistance. This can be explained by the fact that laser doping of iron-based coatings with molybdenum boride increases their heat resistance. This is important at increased loads on the test sample. In addition, molybdenum, interacting with atmospheric oxygen and lubricant, forms molybdenum oxide, which further reduces the coefficient of friction. Therefore, the coating after laser alloying with molybdenum boride can be recommended for operation under conditions of friction with a lubricant at elevated pressures.","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124844023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"JUSTIFICATION OF THE MAIN DESIGN PARAMETERS OF THE ROTARY WORKING BODY OF ROOT HARVEST MACHINES","authors":"S. Hrushetskiy, Oleh Omelyanov","doi":"10.37128/2520-6168-2022-1-2","DOIUrl":"https://doi.org/10.37128/2520-6168-2022-1-2","url":null,"abstract":"Potato is one of the most common crops in Ukraine, most domestic farms are engaged in its production - from the population to large agricultural firms. Moreover, about 95% of the potato produced falls on household plots, which are characterized by the widespread use of manual labor in most technological harvesting operations and low mechanization of the harvesting process as a whole. Harvesting remains the most resource-intensive process in potato production, because today, as you know, the share of energy and labor costs of harvesting processes is 50-60% and 60-70%, respectively. From a brief analytical review of the works devoted to the study of under-digging-separating working bodies of root-tuber harvesters, it can be seen that by now significant theoretical and experimental material has already been accumulated, revealing the patterns of interaction processes of working bodies of various designs with tuberous mass. However, despite this, to date, it has not been possible to create a sufficiently efficient, reliable, low-energy, which will satisfy all agrotechnical requirements for root and tuber harvesters, and the problem of developing such a device is still relevant. Accordingly, the purpose of the study was to conduct a comparative analysis to take the minimum amount of soil together with tubers and provide the possibility of better crushing of the reservoir to facilitate separation and basic parameters while increasing operational productivity, technological reliability of the digging working body and reducing its traction resistance. Based on the results of the research, a new rotary root and tuber harvester has been developed, due to the proposed tooth discs with cutting edges of the lugs and changing the shape of the plowshare of the root and tuber harvester to cylindric, as well as a flat moldboard surface to a rod-separating device, which provides the possibility of better crushing the layer and separating the tubers from the soil rubberized rotor tines for easier separation on the rotary soil separator with rubber tines during harvesting with a rotary root harvester. The proposed scheme of a rotary root and tuber harvester reduces the supply of soil and the separation of tubers from the soil by rubberized rotor fingers to rotary separating working bodies and improves the separation of tubers, thereby reducing their mechanical damage, providing better storage of potatoes, reducing the number of separating devices, and increasing the productivity of the unit. The new rotary working body proposed in the work, taking into account agrotechnical recommendations, should have a rounded surface structure made of high-strength rubber, with cone-shaped protrusions placed at an angle to the circle inscribed in the base. For research, as the main parameters of the rotor, we take its outer diameter Dр, the angle of inclination of the protrusions βв, their height Нв, length Lв, the radius of curvature Rв, the height of the vertices bв and t","PeriodicalId":173336,"journal":{"name":"ENGINEERING, ENERGY, TRANSPORT AIC","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115809134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}