Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.18
T. Egorova, A. Delakhova
— The article analyses the formation of the transport corridor "Lensk - Mirny - Suntar - Nyurba - Vilyuysk Yakutsk" in the territory of one of the north-eastern regions of Russia - the Republic of Sakha (Yakutia). The justification of the significance of the development of the transport corridor for the region is considered as a way to strengthen the unity of the economic space, improve interregional transport and economic relations, to develop entrepreneurship and inter-regional cooperation. Threats that may lead to unforeseen consequences are identified. The long-term dynamic process of spatial development can be regulated using strategic planning methods and innovative development policies. The authors proposed a number of measures to promote an effective model of the formation of transport corridor in Western Yakutia).
{"title":"Formation of an Effective Model of Transport Corridor in the Territory of the Republic of Sakha","authors":"T. Egorova, A. Delakhova","doi":"10.2991/aviaent-19.2019.18","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.18","url":null,"abstract":"— The article analyses the formation of the transport corridor \"Lensk - Mirny - Suntar - Nyurba - Vilyuysk Yakutsk\" in the territory of one of the north-eastern regions of Russia - the Republic of Sakha (Yakutia). The justification of the significance of the development of the transport corridor for the region is considered as a way to strengthen the unity of the economic space, improve interregional transport and economic relations, to develop entrepreneurship and inter-regional cooperation. Threats that may lead to unforeseen consequences are identified. The long-term dynamic process of spatial development can be regulated using strategic planning methods and innovative development policies. The authors proposed a number of measures to promote an effective model of the formation of transport corridor in Western Yakutia).","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127521770","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.11
N. Buyakova, V. Zakaryukin, A. Kryukov
In traction power supply systems (TPSS) extreme modes occur in emergency situations with extreme electromagnetic fields (EMF). Short circuit (SC) is one of the extreme modes that lead to considerable current flows in catenary wires with significant growth of magnetic field strengths. SC modes duration is rather small, since they are, as a rule, removed by relay protection rather promptly. Therefore, taking into account EMF effect on personnel during SC shorttime modes is inexpedient. However, due to higher values of magnetic field strength, in wires of adjacent disconnected power and communication lines significant induced voltage can emerge, whose even short-time affecting personnel and telecommunications low-voltage equipment can be extremely negative. Procedure of EMF modeling and modeling results are presented in the article. EMF modeling was performed using methods and means for determining modes in traction power supply systems and EMF in phase coordinates developed in Irkutsk State Transport University. The main advantage of the approach offered is the systematic description of extreme modes, where traction network is considered inseparably connected with complex external power supply system. Key wordstraction network, emergency mode, electromagnetic safety
{"title":"Modeling of Electromagnetic Fields Created by Traction Networks in Emergency Modes","authors":"N. Buyakova, V. Zakaryukin, A. Kryukov","doi":"10.2991/aviaent-19.2019.11","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.11","url":null,"abstract":"In traction power supply systems (TPSS) extreme modes occur in emergency situations with extreme electromagnetic fields (EMF). Short circuit (SC) is one of the extreme modes that lead to considerable current flows in catenary wires with significant growth of magnetic field strengths. SC modes duration is rather small, since they are, as a rule, removed by relay protection rather promptly. Therefore, taking into account EMF effect on personnel during SC shorttime modes is inexpedient. However, due to higher values of magnetic field strength, in wires of adjacent disconnected power and communication lines significant induced voltage can emerge, whose even short-time affecting personnel and telecommunications low-voltage equipment can be extremely negative. Procedure of EMF modeling and modeling results are presented in the article. EMF modeling was performed using methods and means for determining modes in traction power supply systems and EMF in phase coordinates developed in Irkutsk State Transport University. The main advantage of the approach offered is the systematic description of extreme modes, where traction network is considered inseparably connected with complex external power supply system. Key wordstraction network, emergency mode, electromagnetic safety","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128148890","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.24
V. Gozbenko, S. K. Kargapol’tsev, Yu. I. Karlina, B. O. Kuznetsov, A. Karlina, D. S. Leonovich
The article considers free and forced oscillations of a system with six degrees of freedom with symmetrical and asymmetrical mass-inertial characteristics. The conditions of single-frequency oscillations are obtained. Initial deviations and initial velocities must be interconnected through one of the amplitude distribution coefficients. The differential equations of free vibrations of the system in principal coordinates are six independent linear differential equations of second order. Their common solution is obtained. We examine the possibility of reduction in the quantity of degrees of freedom of the considered system from six to two ones. Passing from six degrees of freedom to two was substantiated with the aid of the numerical experiments. According to calculations, linear and angular deflections of the transportation vehicle, which has six and two degrees of freedom, differ not more than by 10%. This fact indicates that it is possible to replace a study of a system with six degrees of freedom with a system with two degrees of freedom. An example of the transport system, which has three degrees of freedom, is considered. The obtained differential equation is solved in the final form with the specific relationship of the parameters. Analogously, there are equations derived and solutions obtained for the systems, which have one, one-and-ahalf and two degrees of freedom. The equations obtained allow you to define transformations of right parts depending on the considered case of external influences applied to the system and on the number of degrees of freedom. Keywords—mechanical engineering; vibration effects; modeling; forced oscillations; mass-inertial characteristics
{"title":"The Modeling of Mechanical Engineering Facilities to Reduce the Impact of External Vibration Effects","authors":"V. Gozbenko, S. K. Kargapol’tsev, Yu. I. Karlina, B. O. Kuznetsov, A. Karlina, D. S. Leonovich","doi":"10.2991/aviaent-19.2019.24","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.24","url":null,"abstract":"The article considers free and forced oscillations of a system with six degrees of freedom with symmetrical and asymmetrical mass-inertial characteristics. The conditions of single-frequency oscillations are obtained. Initial deviations and initial velocities must be interconnected through one of the amplitude distribution coefficients. The differential equations of free vibrations of the system in principal coordinates are six independent linear differential equations of second order. Their common solution is obtained. We examine the possibility of reduction in the quantity of degrees of freedom of the considered system from six to two ones. Passing from six degrees of freedom to two was substantiated with the aid of the numerical experiments. According to calculations, linear and angular deflections of the transportation vehicle, which has six and two degrees of freedom, differ not more than by 10%. This fact indicates that it is possible to replace a study of a system with six degrees of freedom with a system with two degrees of freedom. An example of the transport system, which has three degrees of freedom, is considered. The obtained differential equation is solved in the final form with the specific relationship of the parameters. Analogously, there are equations derived and solutions obtained for the systems, which have one, one-and-ahalf and two degrees of freedom. The equations obtained allow you to define transformations of right parts depending on the considered case of external influences applied to the system and on the number of degrees of freedom. Keywords—mechanical engineering; vibration effects; modeling; forced oscillations; mass-inertial characteristics","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125633343","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.19
É. Evtushenko, A. Volodin, M. V. Chupakov, V. Sadakov
— The article presents a conceptual and mathematical model of the intelligent decision support system of the unmanned aerial vehicle operator, what will allow one to make informed decisions in real time with a high degree of reliability.
{"title":"Mathematical Model of Intelligent Decision Support System of UAV Operator","authors":"É. Evtushenko, A. Volodin, M. V. Chupakov, V. Sadakov","doi":"10.2991/aviaent-19.2019.19","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.19","url":null,"abstract":"— The article presents a conceptual and mathematical model of the intelligent decision support system of the unmanned aerial vehicle operator, what will allow one to make informed decisions in real time with a high degree of reliability.","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"735 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122944891","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.71
A. Zedgenizov, I. N. Nalyotov
The article deals with the problem of estimating the proportion of individual transport users visiting the focal points of various functional orientations. The factors and strategies of transport policy influencing the proportion of visitors arriving at the focal points by their private transport are given. Recommendations allowing for the practical application of the research findings in the organization of transportation in the focal points are developed.
{"title":"Estimated Probability of Distributing the Proportion of Private Transport Users Visiting the Urban Focal Points","authors":"A. Zedgenizov, I. N. Nalyotov","doi":"10.2991/aviaent-19.2019.71","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.71","url":null,"abstract":"The article deals with the problem of estimating the proportion of individual transport users visiting the focal points of various functional orientations. The factors and strategies of transport policy influencing the proportion of visitors arriving at the focal points by their private transport are given. Recommendations allowing for the practical application of the research findings in the organization of transportation in the focal points are developed.","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121068609","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.51
A. Parshin, A. Savin, V. Morozov, Munko-Jargal Badmayev
{"title":"Development of Low-Cost Unmanned Aerogeophysical System Based on Light VTOL Aircraft","authors":"A. Parshin, A. Savin, V. Morozov, Munko-Jargal Badmayev","doi":"10.2991/aviaent-19.2019.51","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.51","url":null,"abstract":"","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126908596","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.7
L. Bokhoeva, E. Bochektueva, V. Rogov
This article presents the results of experimental studies of definition the mechanical characteristics of epoxy resin and hardener without adding nanopowder and with the inclusion of nanopowders. The stability and destruction process of laminated plates made of composite material with different numbers of layers without nano-additives and with nanopowders in the binder has been studied. The results of experimental studies of the stability and destruction process of laminated plates made of composite material are presented. Experimental and numerical methods are used to estimate the carrying capacity of laminated plates. A technique has been developed for the experimental study of the deformation and strength properties of composite materials using modern test equipment. It was established that the discrepancies between the values of the critical load of four-layer samples and the critical load of three-layer samples are 2-3%, therefore, to reduce the weight, products from composite materials can be made of three-layer plates. In the ANSYS system, twolayer, three-layer and four-layer plates were modeled. The results of numerical calculation by the finite element method are presented. Comparison of the obtained experimental results with numerical values is made, the possibility of using experimental data on the mechanical behavior of layered composite materials in the design and calculation of protective screen modules is estimated.
{"title":"Experimental Study of the Stability of Layered Composite Plates","authors":"L. Bokhoeva, E. Bochektueva, V. Rogov","doi":"10.2991/aviaent-19.2019.7","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.7","url":null,"abstract":"This article presents the results of experimental studies of definition the mechanical characteristics of epoxy resin and hardener without adding nanopowder and with the inclusion of nanopowders. The stability and destruction process of laminated plates made of composite material with different numbers of layers without nano-additives and with nanopowders in the binder has been studied. The results of experimental studies of the stability and destruction process of laminated plates made of composite material are presented. Experimental and numerical methods are used to estimate the carrying capacity of laminated plates. A technique has been developed for the experimental study of the deformation and strength properties of composite materials using modern test equipment. It was established that the discrepancies between the values of the critical load of four-layer samples and the critical load of three-layer samples are 2-3%, therefore, to reduce the weight, products from composite materials can be made of three-layer plates. In the ANSYS system, twolayer, three-layer and four-layer plates were modeled. The results of numerical calculation by the finite element method are presented. Comparison of the obtained experimental results with numerical values is made, the possibility of using experimental data on the mechanical behavior of layered composite materials in the design and calculation of protective screen modules is estimated.","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131680999","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.17
V. G. Drokov, V. Drokov, A. D. Kazmirov, A. Y. Hodunaev
The paper considers the deposition of metallic particles on the main oil filter of aircraft gas turbine engines (GTEs) depending on the filter parameters. It was shown that the filter presence includes systematic error in the measurement of the mass fraction of wear particles independent of the measurement equipment. The influence of the filter parameters on the steady state value of particles mass fraction is discussed. It’s shown that in modern engines that use 10 um fine oil filters the mass fraction is less than 0.01 ppm and can’t be used as a diagnostic feature for engine technical state evaluation. Oil filter wash samples carry the bulk of the wear particles and consequently, the most diagnostic information. Thus, the oil filter wash sample should be used together with oil sample for reliable evaluation of the technical state of the engine. Keywords— Monte-Carlo simulation; filtration process; system of gas-turbine; aircraft engines
{"title":"Monte-Carlo Simulation of the Filtration Processes of Metallic Discrete Impurity in Oil System of Gas-Turbine Aircraft Engines","authors":"V. G. Drokov, V. Drokov, A. D. Kazmirov, A. Y. Hodunaev","doi":"10.2991/aviaent-19.2019.17","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.17","url":null,"abstract":"The paper considers the deposition of metallic particles on the main oil filter of aircraft gas turbine engines (GTEs) depending on the filter parameters. It was shown that the filter presence includes systematic error in the measurement of the mass fraction of wear particles independent of the measurement equipment. The influence of the filter parameters on the steady state value of particles mass fraction is discussed. It’s shown that in modern engines that use 10 um fine oil filters the mass fraction is less than 0.01 ppm and can’t be used as a diagnostic feature for engine technical state evaluation. Oil filter wash samples carry the bulk of the wear particles and consequently, the most diagnostic information. Thus, the oil filter wash sample should be used together with oil sample for reliable evaluation of the technical state of the engine. Keywords— Monte-Carlo simulation; filtration process; system of gas-turbine; aircraft engines","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128593205","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.74
A. Pykhalov, V. Duong, I. Zotov
The paper presents a method of mathematical modeling of composite and heterogeneous deformable materials used, in particular, in modern aircraft structures, such as MS-21. The technique is based on scanning a deformed body by a computer tomograph, with further mathematical transformation of the information obtained for its use in the finite element method analyzing the stress-strain state of parts made of composite and heterogeneous materials. Traditionally, the mechanical characteristics of a real deformable solid body are given as an average value, for example, common for the material of the part and obtained during the test of standard samples. The main purpose of the presented technique is, along with improving the accuracy of calculations, the determining of the level of defects in the material and the degree of its impact on the performance of the product as a whole. The method for determining the real change in the mechanical characteristics of the material of deformable solid bodies is based on the use, on the one hand, of the pixel characteristics of raster images scanned by a computer tomograph; on the other hand, the averaged data on the mechanical characteristics of the material obtained as a result of full-scale tests of standard samples are used. The result of this approach makes it possible to simulate these inhomogeneities in the construction of a finite element model of real deformable solid bodies. The developed approach can be applied to any physical principles of scanning, such as x-ray, ultrasonic, laser and etc., as well as for all types of materials when the information obtained as a result of scanning is formed in the form of a digital (raster) image.
{"title":"Mathematical Modeling of Composite and Inhomogeneous Deformable Materials Based on Scanning and Finite Element Method","authors":"A. Pykhalov, V. Duong, I. Zotov","doi":"10.2991/aviaent-19.2019.74","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.74","url":null,"abstract":"The paper presents a method of mathematical modeling of composite and heterogeneous deformable materials used, in particular, in modern aircraft structures, such as MS-21. The technique is based on scanning a deformed body by a computer tomograph, with further mathematical transformation of the information obtained for its use in the finite element method analyzing the stress-strain state of parts made of composite and heterogeneous materials. Traditionally, the mechanical characteristics of a real deformable solid body are given as an average value, for example, common for the material of the part and obtained during the test of standard samples. The main purpose of the presented technique is, along with improving the accuracy of calculations, the determining of the level of defects in the material and the degree of its impact on the performance of the product as a whole. The method for determining the real change in the mechanical characteristics of the material of deformable solid bodies is based on the use, on the one hand, of the pixel characteristics of raster images scanned by a computer tomograph; on the other hand, the averaged data on the mechanical characteristics of the material obtained as a result of full-scale tests of standard samples are used. The result of this approach makes it possible to simulate these inhomogeneities in the construction of a finite element model of real deformable solid bodies. The developed approach can be applied to any physical principles of scanning, such as x-ray, ultrasonic, laser and etc., as well as for all types of materials when the information obtained as a result of scanning is formed in the form of a digital (raster) image.","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133660930","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}
Pub Date : 2019-11-01DOI: 10.2991/aviaent-19.2019.27
O. Fedonin, D. Petreshin, V. Matlakhov, V. Handozhko
The results of theoretical study and practical realization of a technical vision system in the production of ceramic tiles are summarized. The possibility of using technical vision during the technological operation to control the absence of defects of ceramic tiles when it moves along the conveyor in the production cycle is shown.
{"title":"Automated Control of Technological Parameters of Ceramic Tiles Using Technical Vision","authors":"O. Fedonin, D. Petreshin, V. Matlakhov, V. Handozhko","doi":"10.2991/aviaent-19.2019.27","DOIUrl":"https://doi.org/10.2991/aviaent-19.2019.27","url":null,"abstract":"The results of theoretical study and practical realization of a technical vision system in the production of ceramic tiles are summarized. The possibility of using technical vision during the technological operation to control the absence of defects of ceramic tiles when it moves along the conveyor in the production cycle is shown.","PeriodicalId":158920,"journal":{"name":"Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124227531","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}
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