Traktory i sel hozmashiny最新文献

{"title":"Forecasting the resource of console-fixed parts during wear with account of permissible stresses","authors":"A. Mikhalchenkov, V. Komogortsev, I. Kozarez, A. V. Dyachenko, M. Mikhalchenkova","doi":"10.17816/0321-4443-100404","DOIUrl":"https://doi.org/10.17816/0321-4443-100404","url":null,"abstract":"BACKGROUND: Often, parts of the working bodies of machines operating in abrasive environments have a cantilever mount. Due to wear, their dimensions are lost, specified by the technical conditions, and destruction occurs. The resource of these products is determined by the allowable bending stresses, taking into account the intensity of their wear. The existing theoretical methods for predicting the operating time of a part to its limiting state when solving problems do not take into account the criteria of strength and wear in the complex. \u0000AIMS: The aim consists in obtaining a mathematical expression that determines the resource of the part when it is worn, taking into account the allowable stresses. \u0000METHODS: The disclosure of the goal was carried out by solving the problem of predicting the resource of a cantilever-fixed using the classical course of the resistance of materials, ele-ments of the theory of elasticity and the basics of tribotechnics. \u0000RESULTS: As a result of mathematical research and based on practical knowledge, a formula was obtained for determining the resource of a part, which takes into account the dimensions of the part, the magnitude of the allowable stresses, the coefficient regulating the resistance of the material to wear, the pressure on the working surface, the pressure at the pinch point and the pres-sure at the free end timber. The conditions determined by two inequalities are established under which the part will be operable. \u0000CONCLUSION: Mathematical expressions have been obtained that make it possible to predict and the conditions for the performance of cantilever-fixed parts in the process of their wear ac-cording to allowable stresses have been determined.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129436470","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":"Assessment of the compaction effect and operational characteristics of a crawler tractor based on a rheological approach","authors":"S. Nosov, Nicholay Е. Рeregudov","doi":"10.17816/0321-4443-100293","DOIUrl":"https://doi.org/10.17816/0321-4443-100293","url":null,"abstract":"BACKGROUND: At considering the issues of crawler tractors interaction with soil the determining factor is the time-varying impact of loads on the soil layer, its stressed and strained state, which, in turn, directly depends on its stress-strain properties. The properties assessment should be carried out with a rheological approach, which allows to explain many phenomena and processes and to develop new high technologies in terms of the criterion of minimizing the impact on the soil. \u0000AIMS: Studying the compacting ability of a crawler tractor in a configuration in various machine-tractor units, obtaining a curve for the effect of the traction load on the tractor hook, tractor speed and tractor mass redistribution over the lower track wheels on changes in soil compaction due to developing deformations, the coefficient of running resistance and skidding of the crawler-mounted mover. \u0000METHODS: The evoluation method for compaction impact of crawler-mounted mover on the soil layer was developed on the base of the previously constructed a general mathematical model for determining ways of reducing the compacting impact of crawler-mounted movers on the bearing surface, computer calculation programmes and the carried out assessment for the deformation development and changes of soil compaction under the crawler track. \u0000RESULTS: There are presented the simulation results of the process with an assessment of the developing dependences of the crawler tractor rut depth and its sliding on the travelling speed and on the displacement of the center of pressure at different loads on the hook, that obtained with the developed metod of analysis and the well-known theory of hereditary creep of elastic-visco-plastic materials. At the same time, the development of vertical and shear deformations of the soil layer in the area of lower track wheels impact is separately analyzed. \u0000The analysis of the constructed dependencies allows to identify a number of patterns for changes of compacting effect indicators of a crawler tractor on the soil with an assessment of the influence of the main design and technological parameters on them. It is established that taking into account the rheological characteristics of the soil layer and its state parameters permit significantly improve the accuracy of calculations for vertical and shear deformations of the soil layer and its final compaction after successive passes of the crawler lower track wheels. At the same time, the desired indicators behavior is ambiguously at passes of various lower track wheels. \u0000CONCLUSION: The conducted studies contribute to the optimal selection of parts for various machine-tractor units based on a specific crawler tractor, which perform the appropriate technological operations in certain conditions of work at specific parameters of the soil state.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129556086","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":"Reduction of vehicle exhaust gas toxicity due to brake energy recovery","authors":"O. Polivaev, A. Larionov, Dmitry B. Bolotov","doi":"10.17816/0321-4443-100839","DOIUrl":"https://doi.org/10.17816/0321-4443-100839","url":null,"abstract":"BACKGROUND: In recent years, fleet of vehicles in the Russian Federation is on a significant increase, that leads to considerably amplified emissions of toxic gases into the atmosphere. The share of toxic gas emissions from motor vehicles ranges from 65 to 70%. In order to reduce the toxic gas emissions into the atmosphere, electric vehicles have been introduced, but they have a number of disadvantages. These are a limited mileage before recharging and expensive batteries. Also, works on the use of hydrogen as a fuel for cars are conducted at an accelerated pace. However, the issue of a hydrogen fuel storage has not yet been worked out. At the same time, the used fleet of vehicles continues to poison the atmosphere. \u0000AIMS: Studying the braking energy recuperator for decreasing carbonic oxide CO in exhaust gases of the UAZ car. \u0000METHODS: The construction of a combined unit with a gas-hydraulic braking recuperator was developed, which is installed on a UAZ vehicle (RF Pat. No. 2193977). Comparative studies were carried out in accordance with GOST 33670-2015 and GOST 52033-2003. \u0000RESULTS: Results of comparative studies of the car showed that a minimum of CO emissions is observed in high gear, at a speed of 1825 m/s, and CO emissions significantly increase in lower gears. The recuperator eliminates this drawback due to the additional power transmission to the driving wheels. \u0000CONCLUSION. When a car starts in the urban cycle, there is a minimum of CO emissions with a recuperator, at the same time the car acceleration increases, that reduces the acceleration time and the distance by 3035%. A car with a recuperator on average consumed gasoline up to 15 l per 100 km, and this parameter of the production car was up to 17,5 l per 100 km of track. Due to the recuperator, CO emissions are reduced by 16%.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129740086","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":"Calculation of the required minimum of a motor oil level on cylinder-piston group moving surfaces of the automotive diesel","authors":"S. V. Putintsev, Sergey A. Anikin, Sofia P. Demenkova, S. Strelnikova","doi":"10.17816/0321-4443-100063","DOIUrl":"https://doi.org/10.17816/0321-4443-100063","url":null,"abstract":"BACKGROUND: Theme of this article is actual because issues of the reliable and cost-effective opera-tion of augmented automotive piston engines are still not solved. An important aspect of solving the problem is rational oil supply of the cylinder-piston group. \u0000AIMS: The purpose of this work is the required minimum motor oil level estimation for the hydrodynamic lubrication of the cylinder-piston skirt pair. There were set and solved the tasks of determining the volume of motor oil capable of filling: 1) cavities of the flat-topped surface of the cylinder; 2) a raised surface of the piston skirt and 3) the piston skirt clearance. The object of study is an automotive diesel. \u0000METHODS: Three types of analytical determination of the total volume of the cavities of the rough surface and the piston skirt clearance were used as methods for estimation of a motor oil level. \u0000RESULTS: It was found, that the estimation with the well known formula for oil volume (a method 1) gives the overevaluated result of oil level estimation, in comparison with methods 2 and 3, which taking into account the real geometry of cavities and roughness parameters. The advantage of method 3 was determened by criteria of generalization and of simplicity to apply. Using the method 3, the estimated volume of motor oil ensured the hydrodynamic lubrication mode of the cylinder piston skirt pair of the object of study was obtained. \u0000CONCLUSION: The analytical expressions obtained by method 3 can be recommended to optimize the piston engine lubrication systems for reducing the friction and wear losses as well as to minimize a risk of oil starvation and increased oil consumption through burning.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129772233","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":"Investigation of the combustion process of activated fuel in an automotive diesel engine","authors":"S. Plotnikov, M. Motovilova, A. N. Kartashevich","doi":"10.17816/0321-4443-100880","DOIUrl":"https://doi.org/10.17816/0321-4443-100880","url":null,"abstract":"BACKGROUND: Intensive development of the transport sphere and the extension of the fleet of tractors and cars, as well as the tightening of standards and requirements in the field of exhaust gas emissions have resulted in increased requirements for the combustion process. This problem can be solved by improving the working process in the engine by preheating the fuel to 300 C in the high pressure fuel supply system. Under external thermal influence, the conditions of mixture formation are improved, an increase in the rate of preflame reactions and a positive change in the dynamics of the combustion process are observed. When potential energy of hydrocarbon molecules increases in the activated complex system, energy is redistributed among active molecules. Along with this, the rate coefficient of a chemical reaction increases due to the concentration of foci of hydrocarbon molecules that have reached the energy barrier. \u0000The object of research is the process of diesel fuel combustion at preliminary external influence on it. \u0000AIMS: The aim is to study the combustion process of a motor-tractor diesel engine upon fuel activation. Development of a scheme of individual phases of the activated diesel fuel combustion of depending on the temperature at heating. \u0000METHODS: Theoretical study and analysis of the combustion process of thermally preprepared fuel for an automotive diesel engine. Theoretical determination of the dependence of the rate of formation and concentration of toxic components and dispersed particles on the rate constant of direct and reverse chemical reactions, as well as on the activation temperature of fuel at emission in exhaust gases. \u0000RESULTS: The actual coefficient of molecular change of the working mixture increases when diesel fuel is activated. The rate of formation of total nitrogen oxides and hydrocarbons increases by 1.79% and 3.66%. The proportion of unburned carbon in the combustion process on activated fuel varies within (24) %. \u0000CONCLUSIONS: Theoretically, a scheme for changing individual phases of the activated fuel combustion process by time and temperature has been developed. Fuel heating accelerates the pre-flame preparation in the liquid phase, shortens the duration of the rapid gorenje phase. The concentration of toxic indicators depends on the constant of the chemical reaction rate and the activation temperature of the fuel.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115734586","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":"Method for analyzing parameters of single-level pneumatic elastic elements with backpressure","authors":"O. Nakaznoy, A. Tsipilev","doi":"10.17816/0321-4443-99890","DOIUrl":"https://doi.org/10.17816/0321-4443-99890","url":null,"abstract":"BACKGROUND: Trucks, as a rule, have a significate difference between the kerb and gross weights. Usual spring or leaf suspensions do not allow to have acceptable values of static running and suspension stiffness at different machine loading, and pneumatic elastic elements, despite their relative simplicity, are mainly implemented only on overseas technology samples, and designers do not pay attention to pneumatic elastic elements with counterpressure. One of determinants of truck users is the acceptable vibration loading of the drivers seat. Trucks with a carrying capacity comparable or even overestimated to their kerb weight, when they move without cargo on public roads, especially with a dirt surface, have significant levels of vibration acceleration at using the metal elastic. \u0000AIMS: The purpose of the present work is to reduce the vibration loading of the drivers seat due to rational choice of parameters of the cushioning system with pneumatic elastic elements with backpressure, that ensures the non-zero static travel and saticfactory stiffness of suspension in the kerb and loaded state. \u0000METHODS: Using the regorous mathematical tools of Mechanics, Pneumatics and Thermodinamics, scientific-based theoretical prerequisites as well confirm the validity and reliability of the presented dependencies for characteristics calculation, conclusions and recommendations. \u0000RESULTS: According to the method developed and proposed in this article, effective characteristics of the pneumatic elastic elements with a single-level stiffness and backpressure for a KAMAZ-53215 Selkhoznik truck were obtained. At the kerb weight, the static stroke of the front and rear suspensions is approximately 0.06 m; at a gross weight it is of 0.12 m and 0.24 m, respectively. The period of normal vertical vibrations decrease by 25% versus a gross vehicle weight and by 31% at absence of backpressure, however, it occurs in the allowable range. \u0000CONCLUSIONS: The proposed method allows to determine the base design parameters of the pneumatic elasticity of the suspension elements of wheeled vehicles, providing an acceptable periods for a normal vertical oscillations of the cushoining body with maintaining the non-zero static stroke to a large weight range.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133661918","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":"Prediction of cyclic durability and risk analysis of inconsistencies in the supporting structures of mobile vehicles","authors":"Alexander N. Panov","doi":"10.17816/0321-4443-2021-6-45-53","DOIUrl":"https://doi.org/10.17816/0321-4443-2021-6-45-53","url":null,"abstract":"The reliability and safety of mobile vehicles is determined by their carrier system. Achieving a low probability of failure of structures and reducing the cost of equipment is possible by changing the traditional methods of predicting reliability and applying risk analysis, as well as using risk-based design. The aim of the work is to develop methods for predicting the cyclic durability of elements, fastening prefabricated load-bearing structures and analysis to achieve acceptable risks of mobile vehicles at the stages of risk-oriented design. The methods and standards were developed in order to provide methodological support of risk-based design. Those allow designers and engineers to use new methods of design and calculation of tractor and agricultural machinery. It is proposed to introduce into the existing notation system of design and technological documentation the identifiers for parameters as the priority indicators and to achieve when designing the probability of occurrence of each potential cause of failure up to a given level of risk, taking into account priority. The tool for achieving low failure probabilities is the construction of diagrams of cause-and-effect relationships of failures is the source of cause and effect based on the method of deduction and induction. A calculation and experimental method for predicting reliability, according to the criterion of cyclic durability of load-bearing structures and fasteners was developed. The technique is based on local modeling of damage initiation zones, taking into account the influence of design and technological factors of production, simulating the load mode of a mobile vehicle, its damage zones. The following are used for the calculation: finite element method, experimental load assessment, fatigue resistance characteristics of load-bearing elements, rivets and bolts, damage accumulation hypotheses. Risk analysis is carried out using the FMEA methodology. As a result of the risk analysis in a probabilistic formulation, a conclusion is made about the possible damage to the supplier the number of mobile vehicles that will not ensure the fulfillment of the stated requirements for a given resource and warranty mileage. Thus, data for assessing risks and making a decision on the advisability of redesigning equipment appear. The created methodological support for predicting cyclic durability and risk analysis for the implementation of risk-based design allows: to eliminate the uncompetitive level of product quality and production quality, as well as low efficiency and labor productivity; apply new design technologies, design and production preparation methods that reduce development time. The developed methods and means of the risk-based approach have been widely tested and are used in the practice of auto-tractor-agricultural machine building.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126045874","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":"Development of a methodology for rationing the route fuel consumption of the LIAZ-5256.57 bus in operation","authors":"P. A. Boloyev, N. Petrov, Philip A. Skrybykin","doi":"10.17816/0321-4443-2021-6-90-98","DOIUrl":"https://doi.org/10.17816/0321-4443-2021-6-90-98","url":null,"abstract":"The article analyzes suburban bus transportation on specific routes in the Republic of Sakha (Yakutia). Route No. 101 Yakutsk Tabaga with a total length of 31 km was chosen for the experimental study. The timetable for the movement of buses of the municipal unitary enterprise Yakutsk Passenger Transport Enterprise (YAPAK) on the suburban route is given. The main technical data of the LiAZ-5256.57 bus were studied. In accordance with international rules for buses, the determination of the amount of fuel consumption and specific emissions of normalized toxic components is carried out using a driving cycle on working drums. A technique to calculate fuel consumption is used for modeling engine performance indicators that provide a change in the traction and speed characteristics of the vehicle in accordance with the established driving cycle. The calculated fuel consumption results for the NEDC driving cycle are compared with experimental data. As a comparison of calculated and theoretical data on fuel consumption with practical data, a Cummins type CG 250 engine is considered. The internal combustion engine is installed on the LiAZ-5256.57 bus. Experimental data on the fuel consumption of this bus per 100 kilometers (km) showed 49 nm3, and theoretical calculations of the fuel consumption of the bus per 100 km using the proposed method showed 48 nm3. \u0000Thus, to assess the traction and speed characteristics of the bus, the proposed combined method can be used, which makes it possible to obtain a calculation of fuel consumption that is closer to the experimental data on the driving cycle. Based on the initial data of the vehicle, the effective performance of the engine is evaluated. A computational method for modeling tests and an experimental driving cycle for motor vehicles with a total mass of more than five tons are proposed.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125300629","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 first steps to create domestic neutralizers of exhaust gases for automobiles and tractors","authors":"Iliya V. Ignatovich","doi":"10.17816/0321-4443-2021-6-6-14","DOIUrl":"https://doi.org/10.17816/0321-4443-2021-6-6-14","url":null,"abstract":"The article describes the history of the development and creation of the first domestic neutralizers of exhaust gases of internal combustion engines, which began with testing and research of foreign neutralizers. Sequential stages of design, study and testing of domestic converters for gasoline and diesel engines are considered. There are described the following processes: the process of developing methods for testing engines for toxicity and the process of creating estimated indicators and developing normative and technical documents in the field of toxicity of engines and vehicles.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131268806","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":"Restoration and alloying of working bodies of earth-moving machinery","authors":"O. V. Kazannikov, E. Popov","doi":"10.17816/0321-4443-2021-6-82-89","DOIUrl":"https://doi.org/10.17816/0321-4443-2021-6-82-89","url":null,"abstract":"During the operation of road-building and earth-moving machinery, their working bodies are subjected to the greatest wear, in particular: crowns of rippers, blades of dumps, teeth of excavator buckets. The limiting state of parts is characterized by a 2535 % loss of mass of worn elements of working bodies that have direct contact with the ground. Rejected during repair parts are sent for recycling or restoration. The service life of some of the most loaded parts when working with heavy soils is several hours. The need for crowns for earthmoving equipment from enterprises involved in road construction and quarrying in the Far East region is measured in tens of thousands of pieces per year. Replenishment of stocks of wear parts makes it necessary to implement complex logistics schemes due to the remoteness of facilities from the centers of production of parts, and is always accompanied by significant costs. Therefore, the problem of restoring and strengthening worn crowns of rippers and teeth of excavator buckets is very relevant. Various industrial and scientific organizations have been solving this problem for a long time, and quite good results in this direction were obtained after a number of developments at the E.O. Paton Electric Welding Institute in the direction of the method of electroslag facing (ESF). Based on this method, various technological processes for the restoration of massive parts were created. The use of ESF allows not only to restore parts with significant wear, but also to obtain the corresponding design requirements or improved functional properties. These, when restoring the working bodies of construction and road vehicles, will increase their durability. The paper considers the possibility of restoring worn crowns of working bodies of earth-moving vehicles by the ESF method, using ore concentrates mined in the Far East as alloying additives.","PeriodicalId":136662,"journal":{"name":"Traktory i sel hozmashiny","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133453781","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}