Traktory i sel hozmashiny最新文献

{"title":"Classification and synthesis of three-loop planetary gearboxes","authors":"K. Salamandra","doi":"10.17816/0321-4443-66400","DOIUrl":"https://doi.org/10.17816/0321-4443-66400","url":null,"abstract":"In the transmissions of trucks, agricultural vehicles and tractors, gear boxes with a planetary divider and/or an additional reductor unit which is depending on the traffic conditions of the machine, reduces the speed of rotation or operates on a direct drive are used. The divider and the additional reductor unit are intended for a stepwise changing of the range of the main 3-speed or 4-speed gearbox, consisting of gears with fixed axles, which makes it possible to increase the number of stages realized 4 times. If the planetary train will work in the differential mode, this will allow additionally increase the number of stages in the combined planetary gearboxes and, accordingly, the number of operating modes of the tractor. Consequently, the main gearbox consists of gears with fixed axes of gears can work either separately in a single-flow mode of operation of the planetary train (reductor or in the direct drive mode) or in a two-flow mode - in parallel with other ordinary gears when the planetary train as a differential. When using two planetary trains operating in the differential mode, the number of parallel power flows increases to three, which makes it possible to further improve the functional and power capabilities of multi-flow gearboxes. The purpose of the study is to analyze gearbox schemes consisting of three sets of gears with fixed gearwheel axes and two differential mechanisms forming three parallel power transmission flows. Classification of possible structural schemes of three-flow transmissions is given, a general expression for calculating the number of stages of a three-flow gearbox is obtained. A technique for the synthesis of kinematic schemes of three-flow planetary gearboxes is described, with the using of which new gearbox schemes are obtained for each possible structure, which are characterized by using simple mechanisms, high efficiency and a small number of control elements.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131328338","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 qualitative indicators of the operation of combine harvesters with various designs of threshing-separating devices","authors":"G. Maslov, B. Y. Martynov, A. V. Belyaev","doi":"10.17816/0321-4443-66367","DOIUrl":"https://doi.org/10.17816/0321-4443-66367","url":null,"abstract":"The results of research on the qualitative performance of three types of combine harvesters with various designs of threshing-separating devices: the slashing type (Don-1500B), the slashing type with the accelerator (Tucano 480) and the rotor type (TORUM-740) are analyzed. The aim of the research is to reveal the best design of threshing-separating devices, which ensures the increase of combine productivity, quality of work, reduction of costs and crop losses. The urgency of the task under current market conditions is determined by the decrease in demand for Russian grain, which is sold abroad at the level of 4-5 class, and also by the need to reduce costs for the technological process and crop losses. During the research, theoretical and experimental methods were used, based on the application of the main provisions of the theory of agricultural machines and measurement methods, regulated by specific documentation. The results of theoretical studies on the determination of the dependence of the loss of the grain yield of winter wheat on the productivity of the combine harvester TORUM-740 per hour of the main time are presented. The cost of indirect losses of harvest (from macro- and micro damage to the grain of winter wheat of Olkhon type) is substantiated by various designs of threshing-separating devices. The results of laboratory studies of technological qualities of grain are presented: vitreousness, protein and raw gluten content after harvest ripening, as well as seed germination. The results of tests of combines on specific performance indicators, fuel consumption, energy intensity and grain cost are presented. It is concluded that from the self-propelled combine harvesters used in harvesting winter wheat of Olkhon type of Krasnodar Research Institute of Agriculture named after P. Lukyanenko the best operational and economic parameters and technological properties of the received grain were ensured by TORUM-740 combine.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124843947","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":"Probabilistic-statistical method for determining ergonomic tolerances of machine-tractor units with a gas-turbine engine","authors":"V. Shkrabak, N. Dzhabborov","doi":"10.17816/0321-4443-66406","DOIUrl":"https://doi.org/10.17816/0321-4443-66406","url":null,"abstract":"The justification and usage of tolerances for ergonomic parameters ensure safety and improve the conditions and safety of operators of machine-tractor units. The subject of the investigation is a development of the mathematical models for a determination of the ergonomic parameters of machine-tractor units with gas-turbine engines. The aim of the investigations is a development of the probabilistic-statistical method for a determination of the ergonomic tolerances of machine-tractor units equipped with gas turbine engines. The novelty of the researches consists in the developed mathematical models and algorithm for a calculation of the tolerances for ergonomic parameters of machine-tractor units with gas-turbine engines. The proposed method is developed on the basis of systems analysis and methods of collecting and processing information, mathematical modeling. At the same time, state standards GOST 26387-8, GOST R ISO 15005-2012, GOST R ISO 15534-1-2009 were also used. Ergonomic parameters of machine-tractor units are divided into the following basic groups: anthropometric, hygienic, physiological and psychological. As the main quantitative characteristics of the tolerances for ergonomic parameters of machine-tractor units, the following are defined: adjusting tolerances for the level of adjustment, adjusting tolerances for the accuracy of adjustment and control tolerances. The proposed method and algorithm for a calculation allow to predict the optimal values of ergonomic tolerances of machine-tractor units with a probability of 0,95. As an example in the article, the examples of calculating the temperature tolerances at the mechanic workplace of the machine-tractor unit with a gas-turbine engine GTD-350T are given. It is established that the optimum values of the adjusting tolerance for the level of the temperature setting at the mechanic workplace are equal to 20±1 °C, and the adjusting tolerance for the accuracy of the adjustment is ±0,7 °C. The established ergonomic tolerances and the probabilistic-statistical method for their determination are intended for a justification, continuous control and ergonomic parameters assessments that ensure the safety and improvement of the conditions and labor protection of the operator of machine-tractor units with a gas turbine engine. The proposed probabilistic-statistical method provides the definition and optimization of ergonomic parameters of machine-tractor units with a gas turbine engine, taking into account the probabilistic character of their changes under specific conditions of their operation.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121105709","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":"The method for calculating the traction resistance of a flat disk","authors":"A. Akimov, Y. Konstantinov","doi":"10.17816/0321-4443-66379","DOIUrl":"https://doi.org/10.17816/0321-4443-66379","url":null,"abstract":"Scuffler with flat discs are widely used in areas, which are subject to wind erosion of soils, to cover moisture on the stubble fields. Flat discs do not wrap the layers they remove, but only loosen them, shifting them aside. It is preferable to use such scrapers during presowing tillage and on steam, since in this case there is less sputtering of the soil, and its lower (moist) layers are not carried to the surface. Therefore, many industrially manufactured scufflers are equipped with flat discs, and the task of constructing a mathematical model for the interaction of such discs with soil is topical. Many mathematical models of the disc-soil interaction, taking into account the distribution of soil reaction forces on the disk, have been proposed, but all these models were constructed assuming that the disk is moving in its plane. Therefore, they are not applicable to the disk of a lakeshield moving with a non-zero angle of attack in the soil. The purpose of this work is to construct a mathematical model that allows calculating the traction resistance of a disk moving with a given angle of attack. The basic assumptions made in the construction of this model: the speed of the translational movement of the disk and its depth are constant; friction in the disk bearing can be neglected; the soil pressure on the lateral surface of the disc and the force of the soil reactions per unit length of its blade can be replaced by their mean values. An explicit expression is obtained for the traction resistance of a disk of a scuffler moving with an angle of attack, depending on its relative depth, the angle of attack, and the empirical coefficients. The adequacy of the constructed mathematical model is confirmed by comparison with known experimental data. It makes it possible to significantly reduce the number of full-scale experiments on the study of the interaction of flat discs of a scuffler with the soil, replacing them with computational ones, and reasonably carry out power and strength calculations of such discs. In addition, it can be used to optimize the parameters of the flat discs of the scuffler.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125829150","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":"The unification of certain terms and concepts used in the study of land transport-technological vehicles","authors":"A. P. Parfenov, Y. Shchetinin","doi":"10.17816/0321-4443-66389","DOIUrl":"https://doi.org/10.17816/0321-4443-66389","url":null,"abstract":"On the basis of the analysis of terminology used in textbooks, monographs and articles, related to the theory, design and calculation of automobiles, tractors, wheeled and caterpillar transport and traction machines, the uniform terms and concepts are proposed, the most frequently used in the above mentioned disciplines and related technical documents to describe similar phenomena or processes. The coefficient of traction, tractive force on the surface adhesion, the vehicle adhesive weight, the coefficient of adhesive weight, the specific tractive force, the specific hook load, the coefficient of resistance to the rectilinear motion of the machine, the road surface resistance coefficient, the tractive force of the machine, the free engine power, the engine power losses associated with its maintenance, the parameter of rotation of the caterpillar tractor and the power factor of rotation are analyzed. In various literary sources, different terms are used to designate the same quantities, the same definitions are treated differently. It has been causing certain inconveniences and introduces confusion in the theory of land vehicles. The necessity for such unification is particularly relevant in relation to the approval of the Federal Education Standard in the speciality 23.05.01 «Land Transport-Technological Means», in which the above mentioned disciplines are included in the training of specialists, and the knowledge of the relevant technical terminology is considered at the level of competence. In this article, concrete proposals are given on the unification of certain terms and concepts used in the above mentioned theoretical disciplines. Since the field of terminology and definitions is rather painful and delicate, these proposals are submitted for a substantive discussion by professionals.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130377117","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":"The substantiation of parameters of sowing machine with adaptive dosing elements for seeding of corn","authors":"K. Dubina, A. Nesmiyan, V. Dolzhikov, A. A. Ashitko","doi":"10.17816/0321-4443-66356","DOIUrl":"https://doi.org/10.17816/0321-4443-66356","url":null,"abstract":"For sowing of corn precision seeders are used, one of the most complex and responsible details of which is a sowing machine. The purpose of this study is to substantiate the rational design and parameters of the dosing elements and the «superfluous» seeds seeder of the vacuum sowing device, which ensure an even increase in the supply of corn seeds to the furrow. A vacuum sowing machine is proposed for use in production, in which elongated suction holes are made on the sowing disk in such a way that their long axes are oriented to a radial direction at α angle. In addition, in the design of the sowing apparatus, the thickness of the first three projections of seeder for «superfluous» seeds is proposed to be made stepwise. Experiments carried out on the matrix of the orthogonal plan of the second order showed that the following parameters and tuning regimes of such a machine are rational for sowing corn seeds: width of suction holes tдэ = 3 mm; the smallest slot width in the vacuum chamber liner t = 3,0...3,5 mm; exhaustion in the vacuum chamber H = 5 kPa; thickness of the input edge of the working part of the “superfluous” seeds seeder h = 1,5 mm; angle of deviation of the longitudinal axes of the suction holes of the sowing disc from the radial direction α = 12...15 deg. Under laboratory conditions the machine provided the frequency of single seed feeds p1 = 99,0...99,5 %, which is close to the technological optimum. At the same time, the quality of seed dosing remained stable even with a significant increase in the angular velocity of the sowing disk.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133755676","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":"Increase in the level of functioning of agricultural tillage machines by justifying the parameters of the column of the working body","authors":"S. Kambulov, V. Rykov, I. Bozhko, V. V. Kolesnik","doi":"10.17816/0321-4443-66362","DOIUrl":"https://doi.org/10.17816/0321-4443-66362","url":null,"abstract":"The working bodies of tillers perform the most important role from the point of view of the technological process of tillage, as they provide all the parameters of its application. The purpose of the study is the justification of the parameters of the column of the working body of the tiller machine. The traction resistance as the main parameter of the working element is affected by the shape of lateral profile and cross-section of the column. In general, in the cross section, the columns of the working bodies can have: a plane with rectilinear boundaries, a plane with curvilinear convex boundaries, or a plane with curvilinear concave boundaries. The compacted core of the soil in front of the stand is not formed when the grinding angle is not more than 50°. In all other cases, such a nucleus is formed even at asymmetric sharpening angles. Consequently, the necessary condition for the shape of the cross section of the column should be the observance of the value of mentioned angle. The cross-section of the column (Folium of Descartes) meets the requirements imposed on it, as the sharpening angle does not exceed 50°, which does not contribute to the formation of the compaction core, and the boundary has the shape of a convex line, which ensures a minimum absolute speed, on soil movement. The column of the working body of the tiller machine should have the shape of a lateral profile close to the logarithmic curve, which reduces the energy intensity of the process by 20 ... 45 %, and in the cross section of the column there must be a plane bounded by arcs of the ellipse and tangent to these arcs drawn so that the angle at the top of the ellipse did not exceed 50°. This reduces the traction resistance of the column by 40 ... 52 %.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123709806","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":"The 30th anniversary of the Educational and method-ological associations of higher educational institutions of the country","authors":"E. E. Baulina, V. Kravets, V. V. Krutashov, A. Serebryakov, V. Sharipov","doi":"10.17816/0321-4443-66404","DOIUrl":"https://doi.org/10.17816/0321-4443-66404","url":null,"abstract":"The role of Educational and methodological associations, established in 1987 on the basis of an order of the Ministry of Higher Education of the USSR, in an improvement of higher education in the country is shown. The activity of the educational and methodological committee on a specialty «Automotive and tractor industry» of the Educational and methodological association of higher education institutions in the field of education of transport vehicles and technological transport complexes in a development and an improvement of the educational process in the higher education institutions that train skilled personnel for the automotive and tractor industries has been described and analyzed. The periods of historical transformations of the collective of the educational and methodological committees and the main activities in which the members of the educational and methodological committee took an active participation are shown. A brief description of the qualification level of the heads of the departments and leading professors of the departments which is part of the educational and methodological committee is given. The contents of the orders of the Ministry of Education and Science of the Russian Federation on the formation of new Federal educational and methodological associations and Federal educational and methodological associations in the system of higher education on the enlarged groups of specialties and training’s directions, including, in the direction of training 23.00.00 Land transport processes and technology are briefly discussed. Excerpts from the provisions on the activities of the Coordinating council of the Federal educational and methodological associations and the Council of federal educational and methodological associations on a large group of specialties and orientations of training and tasks to be addressed by them in their work. On the basis of the conducted analysis of the long-term activity of the educational and methodological committee, it is proposed to use the rich practical experience accumulated by its members for an improvement of the educational process of the automotive and tractor departments of technical higher education institutions of the country in modern conditions. It was proposed about the expediency of participation the members of the educational and methodological committee in the work of the Federal educational and methodological association of higher education «Land transport processes and technology» as members of the Councils in the direction of the training of «Ground transportation and technological complexes» and the Council on the specialty «Ground transport and technological vehicles».","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116884154","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":"Over-view of robotic grippers for physical manipulation with agricultural products","authors":"-. Vu D.K, O. Solenaya, A. Ronzhin","doi":"10.17816/0321-4443-66363","DOIUrl":"https://doi.org/10.17816/0321-4443-66363","url":null,"abstract":"An overview of agro-grips used to control weeds and harvesting is presented. The relevance of the study is justified by the possibility of improving the quality of fresh fruit and vegetable products, reducing production costs, decreasing the labor shortage by developing and introducing agricultural robots. The classification of the grippers, which are installed on robotic agricultural machines for manipulating fruits, weeds and other objects, is compiled. There are 22 types of grip depending on 6 selected criteria: drive type, the presence of the drive in the grip, the number of fingers, the type of grip movement, the type of mechanism, the type of sensors. In this classification, we mainly consider the characteristics of the gripper, which is installed at the end of the manipulator and is responsible for physical contact with the object. Therefore, the main attention is paid to problems requiring direct capture of objects by the agro robot. The problems of direct spraying of weeds or pruning of branches and leaves, in which manipulators also participate, but the objects of influence are not captured by the robot are mentioned. Examples of existing agricultural research robots equipped with combined grippers according to the proposed classification, referring to different types: vacuum gripper with a video camera for capturing tomatoes, six-finger pneumatic gripper with a video camera, a two-fingered gripper with pressure and collision sensors for picking up an apple, three-fingered capture with a video camera for capturing citrus fruits and others are shown. Further work will be devoted to the study of the problems of physical interaction of agro robots with processed objects, differing in weight, density, geometry, surface roughness and other parameters. The issue of joint interaction of a group of heterogeneous terrestrial and airborne robots in the performance of the target agrarian task in an autonomous mission will also be investigated.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134187397","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":"Improvement of the technological process of sowing by stubble seeders","authors":"S. Lopareva, Yu N Mekshun, A. Fominykh, D. Loparev","doi":"10.17816/0321-4443-66368","DOIUrl":"https://doi.org/10.17816/0321-4443-66368","url":null,"abstract":"The basis of the seeding machine fleet is the stubble seeders SZS-2.1, SKP-2.1. A disadvantage of such seeders is the irrational use of the area of feeding due to the uneven distribution of the seed. Improvement of the technological process of sowing is possible by installing seed spreaders on the paw coulters. A scheme of a paw coulter with a passive seed distributor is proposed, each side of which consists of two planes installed at different angles. The calculation scheme and mathematical model allowed to study the process of seed distribution, to reveal the influence of constructive parameters of the coulter and the two-plane distributor on the trajectory of the particle, to determine the rational parameters of the distributor. In Mathcad, a program has been developed that simulates the trajectory of the particle movement along the coulter stand and in the limited under-paw space, which allowed the calculation of the seed distribution process with a coulter with a two-plane distributor. This program allows you to determine the geometric and kinematic parameters of the grain flight reflected from the distributor and the ceiling surface of the opener (trajectory, flight range, direction of the velocity vector when falling to the ground, etc.) when varying the inclination angles of the reflector planes, the incidence of the particle and its physical and mechanical properties. The calculation includes determining the flight parameters of the grain along the vertical straight line in the first stage of the flight, along the “ballistic” curve after each reflection. The results of the calculation are given in the form of a graphical representation of particle trajectories and tables with numerical values of the coordinates of the trajectory and the range of the rebound. To confirm the reliability of the results of theoretical studies and to determine the uniformity of sowing, laboratory tests of paw coulters with two-plane seed spreaders were carried out. The design parameters of two-plane distributors are determined, which ensure the maximum uniformity in the distribution of seeds along the width of the coulters of stubble seeders. Equipping the paw coulters with two-plane spreaders provides seeding with higher quality indices on uniformity and will ensure an increase in the productivity of agricultural crops.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"426 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123092635","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}