Pub Date : 2015-06-01DOI: 10.1109/EVER.2015.7112925
K. Roumani, Benedikt Schmuelling
Recently, interior permanent magnet synchronous machines have been discussed as a possible candidate for hybrid and electrical vehicles. These type of synchronous machines offers high efficiency and high torque by utilizing both magnetic torque and reluctance torque. The reluctance torque caused by the saliency of the machine is used to improve the efficiency and to exploit the full power of the traction drive. In this paper the maximum torque per ampere control strategy is applied on an interior permanent magnet synchronous machine.
{"title":"Study on the MTPA control for a low voltage IPMSM","authors":"K. Roumani, Benedikt Schmuelling","doi":"10.1109/EVER.2015.7112925","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112925","url":null,"abstract":"Recently, interior permanent magnet synchronous machines have been discussed as a possible candidate for hybrid and electrical vehicles. These type of synchronous machines offers high efficiency and high torque by utilizing both magnetic torque and reluctance torque. The reluctance torque caused by the saliency of the machine is used to improve the efficiency and to exploit the full power of the traction drive. In this paper the maximum torque per ampere control strategy is applied on an interior permanent magnet synchronous machine.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125081222","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112914
T. Haugan, Elisabetta Tedeschi
This paper explores the use of the conservative power theory for active shunt compensation, and provides experimental validation of reactive compensation and harmonic filtering. It is aimed to provide a more in-depth review of how the conservative power theory operates as a control algorithm for a shunt compensator. Also there is discussion on some of the challenges associated to practical implementation of active filters.
{"title":"Reactive and harmonic compensation using the conservative power theory","authors":"T. Haugan, Elisabetta Tedeschi","doi":"10.1109/EVER.2015.7112914","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112914","url":null,"abstract":"This paper explores the use of the conservative power theory for active shunt compensation, and provides experimental validation of reactive compensation and harmonic filtering. It is aimed to provide a more in-depth review of how the conservative power theory operates as a control algorithm for a shunt compensator. Also there is discussion on some of the challenges associated to practical implementation of active filters.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125130473","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112945
P. La Delfa, M. Hecquet, F. Gillon, J. Le Besnerais
This paper presents an analysis of the air gap radial Maxwell forces in some three-phase, inner rotor Concentrated Winding surface Permanent Magnet Synchronous Machine (CW-PMSM). Two modular winding machines and one asymmetric, winding machine are considered and simulated by a Finite Element method (FE). The air gap Maxwell pressure results from multiplication of the flux density harmonics due to magnetomotive forces and permeance linked to the magnet, to the armature, to the stator slots and their interactions. An analytical prediction tool, (Analytical Calculation of Harmonic Force Orders -ACHFO) calculates the space and time orders of theses magnetic force harmonics while identifying their origin in terms of, interactions between magnet, armature and teeth effects. Additionally, an experimental Operational Deflection Shape measurement (ODS) is realised, for one modular machine prototype, to validate the electromagnetic model results. Finally the analytical prediction of ACHFO is compared with another method to obtain the origin of low orders radial pressure based on radial flux density convolution combination approach.
{"title":"Analysis of radial force harmonics in PMSM responsible for electromagnetic noise","authors":"P. La Delfa, M. Hecquet, F. Gillon, J. Le Besnerais","doi":"10.1109/EVER.2015.7112945","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112945","url":null,"abstract":"This paper presents an analysis of the air gap radial Maxwell forces in some three-phase, inner rotor Concentrated Winding surface Permanent Magnet Synchronous Machine (CW-PMSM). Two modular winding machines and one asymmetric, winding machine are considered and simulated by a Finite Element method (FE). The air gap Maxwell pressure results from multiplication of the flux density harmonics due to magnetomotive forces and permeance linked to the magnet, to the armature, to the stator slots and their interactions. An analytical prediction tool, (Analytical Calculation of Harmonic Force Orders -ACHFO) calculates the space and time orders of theses magnetic force harmonics while identifying their origin in terms of, interactions between magnet, armature and teeth effects. Additionally, an experimental Operational Deflection Shape measurement (ODS) is realised, for one modular machine prototype, to validate the electromagnetic model results. Finally the analytical prediction of ACHFO is compared with another method to obtain the origin of low orders radial pressure based on radial flux density convolution combination approach.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127673595","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 : 2015-06-01DOI: 10.1109/EVER.2015.7113001
T. Selmi, Hania El-Kanj Baitie, M. Abdul-Niby
This paper deals with a review of solar power station installation requirements. It investigates then an approach to demonstrate a typical station at the Australian College of Kuwait based on Matlab/Simulink. The entire conversion system is supposed to feed a proposed transformerless inverter topology to minimize losses as much as possible. The simulated results have showed promising results and a test bench is under construction to validate the approach.
{"title":"Investigation and sizing of a solar power station at the Australian College of Kuwait","authors":"T. Selmi, Hania El-Kanj Baitie, M. Abdul-Niby","doi":"10.1109/EVER.2015.7113001","DOIUrl":"https://doi.org/10.1109/EVER.2015.7113001","url":null,"abstract":"This paper deals with a review of solar power station installation requirements. It investigates then an approach to demonstrate a typical station at the Australian College of Kuwait based on Matlab/Simulink. The entire conversion system is supposed to feed a proposed transformerless inverter topology to minimize losses as much as possible. The simulated results have showed promising results and a test bench is under construction to validate the approach.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124543825","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112987
E. Redondo-Iglesias, P. Venet, S. Pélissier
This paper presents a methodology for modelling the capacity loss of Lithium ion cells in accelerated ageing tests. We have considered the state-of-charge drift during calendar ageing tests due to irreversible capacity losses.
{"title":"Influence of the non-conservation of SoC value during calendar ageing tests on modelling the capacity loss of batteries","authors":"E. Redondo-Iglesias, P. Venet, S. Pélissier","doi":"10.1109/EVER.2015.7112987","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112987","url":null,"abstract":"This paper presents a methodology for modelling the capacity loss of Lithium ion cells in accelerated ageing tests. We have considered the state-of-charge drift during calendar ageing tests due to irreversible capacity losses.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123346419","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112981
Seima Shili, A. Hijazi, P. Venet, A. Sari, X. Lin-Shi, H. Razik
In this paper, an original technique for monitoring the aging of supercapacitor energy storage system is proposed. The aging of supercapacitor is represented by the degradation of its internal parameters as the loss of capacitance and the increase of the Equivalent Series Resistance (ESR). This degradation is continuous until reaching the end of life criteria. The proposed approach is based on estimating the current ESR, of each storage system element with a fast control of the balancing circuit present at the terminal of each storage element. The fast control is applied for a short moment and could be applied at any storage system state with no incidence on the system. The information about this current parameter makes the state of health monitoring possible. The analysis is performed using simulation with realistic storage system models in order to demonstrate and validate the effectiveness and the accuracy of the proposed technique. The results presented covers storage system such as supercapacitor but could be also applied to batteries.
{"title":"Balancing circuit control for supercapacitor state estimation","authors":"Seima Shili, A. Hijazi, P. Venet, A. Sari, X. Lin-Shi, H. Razik","doi":"10.1109/EVER.2015.7112981","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112981","url":null,"abstract":"In this paper, an original technique for monitoring the aging of supercapacitor energy storage system is proposed. The aging of supercapacitor is represented by the degradation of its internal parameters as the loss of capacitance and the increase of the Equivalent Series Resistance (ESR). This degradation is continuous until reaching the end of life criteria. The proposed approach is based on estimating the current ESR, of each storage system element with a fast control of the balancing circuit present at the terminal of each storage element. The fast control is applied for a short moment and could be applied at any storage system state with no incidence on the system. The information about this current parameter makes the state of health monitoring possible. The analysis is performed using simulation with realistic storage system models in order to demonstrate and validate the effectiveness and the accuracy of the proposed technique. The results presented covers storage system such as supercapacitor but could be also applied to batteries.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117121005","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 : 2015-06-01DOI: 10.1109/EVER.2015.7113033
A. D. Di Tommaso, F. Genduso, R. Miceli
The aim of this paper is to present a software for the analysis and design of windings of rotating electrical machines, considering both the electric and the magnetic specifications on the machine. The considered machines are induction motors (IM) and PM synchronous motors (PMSM). The software accounts for the case of buried magnets (IPMSM), but with some limits, because the calculations require a much more detailed analysis regarding the magnetic circuit. However, this initial limitation of the software, that will be removed in a later version, does not constitute a major limitation as confirmed by the examples presented in this paper.
{"title":"A novel improved matlab-based software for the electric and magnetic analysis and design of rotating electrical machines","authors":"A. D. Di Tommaso, F. Genduso, R. Miceli","doi":"10.1109/EVER.2015.7113033","DOIUrl":"https://doi.org/10.1109/EVER.2015.7113033","url":null,"abstract":"The aim of this paper is to present a software for the analysis and design of windings of rotating electrical machines, considering both the electric and the magnetic specifications on the machine. The considered machines are induction motors (IM) and PM synchronous motors (PMSM). The software accounts for the case of buried magnets (IPMSM), but with some limits, because the calculations require a much more detailed analysis regarding the magnetic circuit. However, this initial limitation of the software, that will be removed in a later version, does not constitute a major limitation as confirmed by the examples presented in this paper.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117137030","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112931
J. Paulides, L. Encica, T. Beernaert, H. H. F. van der Velden, A. Parfant, E. Lomonova
This paper explores the design of an ultra-light-weight power and torque dense motor to enhance the performance of a light-weight electric racing vehicle. Such a racing vehicle is to compete in formula student racing events. The state-of-the-art powertrain in these vehicles are axial-field machines or medium speed radial-field machines with a gear. This paper concerns a high speed traction machine radial-field design that closely considers the endurance duty-cycle and/or driving cycle of a race car and provides fast acceleration. The proposed electrical machine is designed to be ultra-light-weight. Therefore, an 18,000 rpm (single gear), 24 slot, 4 pole and 33 Nm brushless highly saturated permanent magnet machine is designed, with an active mass of around 3.0 kg (~ 10kW/kg and 10 Nm/kg). To account for the various race events, the velocity of the racing tracks is to be closely matched with the machine output characteristics. Within this paper, the design and no-load results will be presented. In the near future (Q2 of 2015), following extended tests, this machine (integrated with a specifically designed single-stage gear) will be used to drive the vehicle using torque vectoring on all four-wheels. We expect that this will result in a significant performance gain in acceleration, endurance and handling characteristics of the 2015 University Racing Eindhoven race vehicle.
为了提高轻型电动赛车的性能，本文研究了一种超轻量化功率和扭矩密集电机的设计。这样的赛车是为了参加方程式学生赛车赛事。这些车辆的最先进的动力系统是轴向场机器或中速径向场机器。本文研究了一种高速牵引机的径向场设计，该设计密切考虑了赛车的耐力占空比和/或行驶周期，并提供了快速加速。所提出的电机被设计成超轻的。因此，设计了18000 rpm(单齿轮)，24槽，4极，33 Nm的无刷高饱和永磁电机，其有效质量约为3.0 kg (~ 10kW/kg和10 Nm/kg)。考虑到各种比赛事件，赛道的速度必须与机器输出特性紧密匹配。在本文中，将介绍设计和空载结果。在不久的将来(2015年第二季度)，经过扩展测试，这台机器(集成了一个专门设计的单级齿轮)将用于在所有四个车轮上使用扭矩矢量驱动车辆。我们预计这将导致2015年埃因霍温大学赛车在加速、耐力和操控特性方面的显著性能提升。
{"title":"Ultra-light-weight high torque density brushless PM machine design: Considering driving-cycle of a four-wheel drive race car","authors":"J. Paulides, L. Encica, T. Beernaert, H. H. F. van der Velden, A. Parfant, E. Lomonova","doi":"10.1109/EVER.2015.7112931","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112931","url":null,"abstract":"This paper explores the design of an ultra-light-weight power and torque dense motor to enhance the performance of a light-weight electric racing vehicle. Such a racing vehicle is to compete in formula student racing events. The state-of-the-art powertrain in these vehicles are axial-field machines or medium speed radial-field machines with a gear. This paper concerns a high speed traction machine radial-field design that closely considers the endurance duty-cycle and/or driving cycle of a race car and provides fast acceleration. The proposed electrical machine is designed to be ultra-light-weight. Therefore, an 18,000 rpm (single gear), 24 slot, 4 pole and 33 Nm brushless highly saturated permanent magnet machine is designed, with an active mass of around 3.0 kg (~ 10kW/kg and 10 Nm/kg). To account for the various race events, the velocity of the racing tracks is to be closely matched with the machine output characteristics. Within this paper, the design and no-load results will be presented. In the near future (Q2 of 2015), following extended tests, this machine (integrated with a specifically designed single-stage gear) will be used to drive the vehicle using torque vectoring on all four-wheels. We expect that this will result in a significant performance gain in acceleration, endurance and handling characteristics of the 2015 University Racing Eindhoven race vehicle.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130993225","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 : 2015-06-01DOI: 10.1109/EVER.2015.7112959
F. Yu, M. Cheng, W. Hua, K. Chau
The flux-switching permanent-magnet (PM) (FSPM) motor is a new class of stator-PM brushless machines, which offers the advantages of high reliability, high power density, and high efficiency. In this paper, a nine-phase FSPM motor with triple star-winding sets spatially displaced by 40 degrees fed by three pulse-width modulated voltage source inverters (VSIs) is proposed, and the fault tolerant operation of the proposed FSPM motor is addressed. The key of this paper is to investigate two remedial strategies for fault-tolerant operation of the FSPM motor drive under open-circuit fault. Firstly, by isolating the faulty star-winding set, the torque pulsations due to phase loss can be remedied, the so-called remedial BLAC operation mode. Secondly, by injecting fifth and seventh harmonic currents to reconstruct armature fields, the low-frequency torque pulsation can also be remedied, the so-called remedial BLAC with harmonic current injection operation mode. Finally, these two remedial operation modes are compared and verified by simulation and experimental results, hence confirming the validity of the proposed fault-tolerant FSPM motor drive.
{"title":"Fault tolerant control of triple star-winding flux switching permanent magnet motor drive due to open phase","authors":"F. Yu, M. Cheng, W. Hua, K. Chau","doi":"10.1109/EVER.2015.7112959","DOIUrl":"https://doi.org/10.1109/EVER.2015.7112959","url":null,"abstract":"The flux-switching permanent-magnet (PM) (FSPM) motor is a new class of stator-PM brushless machines, which offers the advantages of high reliability, high power density, and high efficiency. In this paper, a nine-phase FSPM motor with triple star-winding sets spatially displaced by 40 degrees fed by three pulse-width modulated voltage source inverters (VSIs) is proposed, and the fault tolerant operation of the proposed FSPM motor is addressed. The key of this paper is to investigate two remedial strategies for fault-tolerant operation of the FSPM motor drive under open-circuit fault. Firstly, by isolating the faulty star-winding set, the torque pulsations due to phase loss can be remedied, the so-called remedial BLAC operation mode. Secondly, by injecting fifth and seventh harmonic currents to reconstruct armature fields, the low-frequency torque pulsation can also be remedied, the so-called remedial BLAC with harmonic current injection operation mode. Finally, these two remedial operation modes are compared and verified by simulation and experimental results, hence confirming the validity of the proposed fault-tolerant FSPM motor drive.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129873464","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 : 2015-06-01DOI: 10.1109/EVER.2015.7113019
M. Rosyadi, A. Umemura, R. Takahashi, J. Tamura
In this paper, effect of tie line power control of two area power system connected through VSC-HVDC line on damping load frequency deviation is investigated. New control scheme of the VSC-HVDC to provide frequency regulation is proposed. The control strategy is useful for connecting a power system with high penetration of wind farm to other power system. The study has been performed by simulation analysis using PSCAD/EMTDC, and the dynamic performance of the VSC-HVDC with the proposed control is demonstrated. Simulation results shows that proposed controller can damp frequency fluctuation effectively.
{"title":"Tie line power control of HVDC transmission to damp frequency fluctuation of power system with large scale wind farm integrated","authors":"M. Rosyadi, A. Umemura, R. Takahashi, J. Tamura","doi":"10.1109/EVER.2015.7113019","DOIUrl":"https://doi.org/10.1109/EVER.2015.7113019","url":null,"abstract":"In this paper, effect of tie line power control of two area power system connected through VSC-HVDC line on damping load frequency deviation is investigated. New control scheme of the VSC-HVDC to provide frequency regulation is proposed. The control strategy is useful for connecting a power system with high penetration of wind farm to other power system. The study has been performed by simulation analysis using PSCAD/EMTDC, and the dynamic performance of the VSC-HVDC with the proposed control is demonstrated. Simulation results shows that proposed controller can damp frequency fluctuation effectively.","PeriodicalId":169529,"journal":{"name":"2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128770637","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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