Pub Date : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521988
Yi-Hsun Hsieh, F. Lee
Because of its simple modular structure and easy voltage scaling, the modular multilevel converter (MMC) is deemed the most suitable for high-voltage power conversion using relatively low-voltage devices. In most practices, the volume of the capacitors is more than 50% of the total module size. Hence, methods of reducing circulating energy and the size of the capacitor bank have been widely pursued. Even though a significant progress has been made toward reducing the capacitor voltage ripple, there is a lack of an effective modeling tool that enables a more systemic approach to address control strategies for system optimization. This paper proposes a method of modeling and control based on the state trajectory analysis and offers graphical visualization of the power throughput and circulating energy. Furthermore, through a coordinate transformation, a simple equivalent circuit model is developed leading to the establishment of the two control laws that enable maximum power throughput with minimum circulating energy.
{"title":"Modeling of the Modular Multilevel Converters Based on the State-Plane Analysis and $SigmaDelta$ Coordinate Transformation","authors":"Yi-Hsun Hsieh, F. Lee","doi":"10.1109/EPEPEMC.2018.8521988","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521988","url":null,"abstract":"Because of its simple modular structure and easy voltage scaling, the modular multilevel converter (MMC) is deemed the most suitable for high-voltage power conversion using relatively low-voltage devices. In most practices, the volume of the capacitors is more than 50% of the total module size. Hence, methods of reducing circulating energy and the size of the capacitor bank have been widely pursued. Even though a significant progress has been made toward reducing the capacitor voltage ripple, there is a lack of an effective modeling tool that enables a more systemic approach to address control strategies for system optimization. This paper proposes a method of modeling and control based on the state trajectory analysis and offers graphical visualization of the power throughput and circulating energy. Furthermore, through a coordinate transformation, a simple equivalent circuit model is developed leading to the establishment of the two control laws that enable maximum power throughput with minimum circulating energy.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121039336","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521920
Kouassi N’guessan, Navarro Nicolas, Letrouvé Tony, C. Hervé, Saudemont Christophe, F. Bruno, R. Benoit
This paper deals with a specific electrical railway section involving two classical power stations: Quai de la Gare and Les Ardoines. These two power stations surround Massena, a power station that has been made reversible by adding an IGBT inverter. The study is focussed on the dynamic modelling of both DC and AC parts of the aforementioned power stations in order to highlight the new energy flows that occur in this innovative configuration. The objective of this paper is to quantify the amount of energy recovered during braking phases with the new inverter. The studied case that implements a very basic traffic simulation shows that the train electrical braking power rises and the amount of energy recovered in twelve minutes can be valued to 7kwh.
本文讨论了一个特定的电气化铁路区段，涉及两个经典的发电站:Quai de la Gare和Les Ardoines。这两个电站围绕着马塞纳，马塞纳是一个通过添加IGBT逆变器实现可逆的电站。这项研究的重点是上述电站的直流和交流部分的动态建模，以突出在这种创新配置中出现的新能源流。本文的目的是量化在制动阶段的能量回收与新的逆变器的数量。通过一个非常基础的交通仿真研究案例表明，列车电制动功率上升，12分钟内回收的能量可达7kwh。
{"title":"Dynamic Modelling of Braking Energy Recovered Using a Bi-Directional Power Station on DC Railway Electrical Network","authors":"Kouassi N’guessan, Navarro Nicolas, Letrouvé Tony, C. Hervé, Saudemont Christophe, F. Bruno, R. Benoit","doi":"10.1109/EPEPEMC.2018.8521920","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521920","url":null,"abstract":"This paper deals with a specific electrical railway section involving two classical power stations: Quai de la Gare and Les Ardoines. These two power stations surround Massena, a power station that has been made reversible by adding an IGBT inverter. The study is focussed on the dynamic modelling of both DC and AC parts of the aforementioned power stations in order to highlight the new energy flows that occur in this innovative configuration. The objective of this paper is to quantify the amount of energy recovered during braking phases with the new inverter. The studied case that implements a very basic traffic simulation shows that the train electrical braking power rises and the amount of energy recovered in twelve minutes can be valued to 7kwh.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121827271","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521970
A. Shekhar, L. Ramirez-Elizondo, Zian Qin, P. Bauer
Back-to-back Modular multilevel converters (MMC) for medium voltage dc (MVDC) distribution link applications offer exciting opportunities due to its superior harmonic performance and high efficiency. Based on the steady state equations, it is shown that under specific active and reactive power operation, an increase in dc link voltage can be achieved without necessarily increasing the voltage seen by the MMC submodule components. Using steady state loss model, it is proved that the converter operating efficiency can be improved if this concept is applied.
{"title":"Modular Multilevel Converter Performance with Dynamic MVDC Distribution Link Voltage Rating","authors":"A. Shekhar, L. Ramirez-Elizondo, Zian Qin, P. Bauer","doi":"10.1109/EPEPEMC.2018.8521970","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521970","url":null,"abstract":"Back-to-back Modular multilevel converters (MMC) for medium voltage dc (MVDC) distribution link applications offer exciting opportunities due to its superior harmonic performance and high efficiency. Based on the steady state equations, it is shown that under specific active and reactive power operation, an increase in dc link voltage can be achieved without necessarily increasing the voltage seen by the MMC submodule components. Using steady state loss model, it is proved that the converter operating efficiency can be improved if this concept is applied.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125226608","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 : 2018-08-01DOI: 10.1109/PEMC41159.2018.8994818
P. Karlovsky, J. Bauer
Most of the railway traction vehicles are moved thanks to the transfer of traction, braking force by small contact area between wheels and rail (steal to steal contact). The ability of force transfer by contact area or also the sum of the contact area physical properties is called adhesion. In order to utilize maximum transferable force, a slip controller has to be added into traction drive control structure. Slip control method based on the adhesion slope characteristic detection requires addition of sweep signal into reference torque command. The sweep signal should have particular frequency and amplitude to ensure proper signal detection and thus slip controller function. This is simple for low power drives with relatively high modulation frequency of the traction inverter, but becomes complicated for high power drive with low switching frequency of the semiconductor devices. The paper studies possibility of the Model Predictive Control (MPC) strategy application to support the slip controller function. The considered slip controller is based on the speed and current response of the torque reference signal injection. Therefore, the controller requires high torque control accuracy. Results of MPC are compared with the Direct Torque Control (DTC) strategy that is often used for control of high power drives with induction motor (IM).
{"title":"Wheel slip determination capability of locomotive driven by model predictive control","authors":"P. Karlovsky, J. Bauer","doi":"10.1109/PEMC41159.2018.8994818","DOIUrl":"https://doi.org/10.1109/PEMC41159.2018.8994818","url":null,"abstract":"Most of the railway traction vehicles are moved thanks to the transfer of traction, braking force by small contact area between wheels and rail (steal to steal contact). The ability of force transfer by contact area or also the sum of the contact area physical properties is called adhesion. In order to utilize maximum transferable force, a slip controller has to be added into traction drive control structure. Slip control method based on the adhesion slope characteristic detection requires addition of sweep signal into reference torque command. The sweep signal should have particular frequency and amplitude to ensure proper signal detection and thus slip controller function. This is simple for low power drives with relatively high modulation frequency of the traction inverter, but becomes complicated for high power drive with low switching frequency of the semiconductor devices. The paper studies possibility of the Model Predictive Control (MPC) strategy application to support the slip controller function. The considered slip controller is based on the speed and current response of the torque reference signal injection. Therefore, the controller requires high torque control accuracy. Results of MPC are compared with the Direct Torque Control (DTC) strategy that is often used for control of high power drives with induction motor (IM).","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"74 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128038808","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521925
K. Fellah, M. Guiatni, T. Fricke, F. Holzapfel
This paper propose the design of a longitudinal flight multi-control blending autopilot system which aims to control both of the airspeed, the altitude and the pitch motion of an aircraft. The proposed controller has to perform different tasks during a flight mission such as holding altitude and following a desired flight path. The simulation is performed using the BADA database and Commercial-off-the-shelf (COTS) platform named ‘Xplane’ dedicated to flight simulation. This later gives the possibility to integrate different components (aircraft, UAV s, Ground vehicles, missiles…). These components are integrated in simulation based on both their dynamics and their virtual models. In this paper, the transition between the different flight modes in ensured for optimum handling qualities using the energy angle. We defined the command variables blend between attitude and flight path control. The obtained results for altitude and airspeed hold modes and pitch control demonstrate the satisfactory performances even in presence of external distubance.
{"title":"Longitudinal Flight Multi-Control Blending Verification Using COTS Based Simulation","authors":"K. Fellah, M. Guiatni, T. Fricke, F. Holzapfel","doi":"10.1109/EPEPEMC.2018.8521925","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521925","url":null,"abstract":"This paper propose the design of a longitudinal flight multi-control blending autopilot system which aims to control both of the airspeed, the altitude and the pitch motion of an aircraft. The proposed controller has to perform different tasks during a flight mission such as holding altitude and following a desired flight path. The simulation is performed using the BADA database and Commercial-off-the-shelf (COTS) platform named ‘Xplane’ dedicated to flight simulation. This later gives the possibility to integrate different components (aircraft, UAV s, Ground vehicles, missiles…). These components are integrated in simulation based on both their dynamics and their virtual models. In this paper, the transition between the different flight modes in ensured for optimum handling qualities using the energy angle. We defined the command variables blend between attitude and flight path control. The obtained results for altitude and airspeed hold modes and pitch control demonstrate the satisfactory performances even in presence of external distubance.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131477229","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521994
J. Parkkinen, N. Nevaranta, M. Niemelä, T. Lindh, J. Pyrhönen
Many manufacturing processes depend on accurate multi-axis movements. Development of drive technology has replaced the need of mechanical couplings and cams in synchronized manufacturing operations. In this paper motion synchronization of a biaxial linear tooth-belt drive is studied and, especially, the effects of the data communication's speed between the control system components on the motion synchronization successfulness is analyzed.
{"title":"Motion Synchronization of Biaxial Linear Tooth Belt Drive System","authors":"J. Parkkinen, N. Nevaranta, M. Niemelä, T. Lindh, J. Pyrhönen","doi":"10.1109/EPEPEMC.2018.8521994","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521994","url":null,"abstract":"Many manufacturing processes depend on accurate multi-axis movements. Development of drive technology has replaced the need of mechanical couplings and cams in synchronized manufacturing operations. In this paper motion synchronization of a biaxial linear tooth-belt drive is studied and, especially, the effects of the data communication's speed between the control system components on the motion synchronization successfulness is analyzed.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131564052","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521854
Maoh-Chin Jiang, Tai-Chun Liu
This paper presents a soft-switching single-phase two-arm dynamic voltage restorer (DVR) which can solve the voltage disturbance problems such as voltage sag, voltage swell, undervoltage and over-voltage. The proposed scheme is composed of a two-arm topology which operates as a rectifier and an inverter. Rather than the conventional four-arm topology, the proposed two-arm topology not only reduces the number of main switches but also increases the system reliability and simplifies the control circuits. Using simple resonant units, all main switches of high frequency arm are operated at zero-voltage-switching (ZVS) turn-on, while all auxiliary switches are operated at zero-current-switching (ZCS) turn-off. Finally, some simulation results are presented for verification.
{"title":"A Soft-Switching Single-Phase Two-Arm Dynamic Voltage Restorer","authors":"Maoh-Chin Jiang, Tai-Chun Liu","doi":"10.1109/EPEPEMC.2018.8521854","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521854","url":null,"abstract":"This paper presents a soft-switching single-phase two-arm dynamic voltage restorer (DVR) which can solve the voltage disturbance problems such as voltage sag, voltage swell, undervoltage and over-voltage. The proposed scheme is composed of a two-arm topology which operates as a rectifier and an inverter. Rather than the conventional four-arm topology, the proposed two-arm topology not only reduces the number of main switches but also increases the system reliability and simplifies the control circuits. Using simple resonant units, all main switches of high frequency arm are operated at zero-voltage-switching (ZVS) turn-on, while all auxiliary switches are operated at zero-current-switching (ZCS) turn-off. Finally, some simulation results are presented for verification.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133690058","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521876
Benjamin Ošlaj, P. Slibar, M. Truntič, M. Milanovič
High-temperature thermoelectric generators (TEGs) can be exploited for electrical energy harvesting in a variety of industrial processes that generate excess heat. In order to harvest the maximum amount of energy, a power converter in combination with a maximum power point tracking (MPPT) algorithm is required. This work presents a different approach of using a synchronous buck-boost converter in combination with the perturb and observe (P&O) MPPT algorithm, that uses a variable step size control for improved dynamics. The buck-boost converter is connected to a battery, that is being charged using the TEGs. Experimental results of the implemented MPPT algorithm are shown to prove that the converter reaches the maximum power point in a reasonable time interval. The measured efficiency of the converter is between 96-and 97 %.
{"title":"Synchronous Buck-Boost Converter for Energy Harvesting Application","authors":"Benjamin Ošlaj, P. Slibar, M. Truntič, M. Milanovič","doi":"10.1109/EPEPEMC.2018.8521876","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521876","url":null,"abstract":"High-temperature thermoelectric generators (TEGs) can be exploited for electrical energy harvesting in a variety of industrial processes that generate excess heat. In order to harvest the maximum amount of energy, a power converter in combination with a maximum power point tracking (MPPT) algorithm is required. This work presents a different approach of using a synchronous buck-boost converter in combination with the perturb and observe (P&O) MPPT algorithm, that uses a variable step size control for improved dynamics. The buck-boost converter is connected to a battery, that is being charged using the TEGs. Experimental results of the implemented MPPT algorithm are shown to prove that the converter reaches the maximum power point in a reasonable time interval. The measured efficiency of the converter is between 96-and 97 %.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133788966","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521892
E. Kurbatova, P. Kurbatov, O. Molokanov
This paper presents the results of simulation and experimental study of the linear electrical generator with permanent magnets for a wave energy converter. The focus of the research is on the analysis of the processes during operating of generator with a float. Models of an electric generator and wave energy converting system are developed. Calculations are performed for various methods of stabilizing the operation of the float actuator. Proposed models allow to define the parameters of generator in various operating modes, which are necessary for obtaining the maximum active power output and controlling the reactive power.
{"title":"Analysis of the Operation of a Linear Generator for a Floating Wave Energy Converter","authors":"E. Kurbatova, P. Kurbatov, O. Molokanov","doi":"10.1109/EPEPEMC.2018.8521892","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521892","url":null,"abstract":"This paper presents the results of simulation and experimental study of the linear electrical generator with permanent magnets for a wave energy converter. The focus of the research is on the analysis of the processes during operating of generator with a float. Models of an electric generator and wave energy converting system are developed. Calculations are performed for various methods of stabilizing the operation of the float actuator. Proposed models allow to define the parameters of generator in various operating modes, which are necessary for obtaining the maximum active power output and controlling the reactive power.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132226994","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 : 2018-08-01DOI: 10.1109/EPEPEMC.2018.8521921
B. Xiang, W. Wong
Comparing with the normal inertially stabilized platform supported by the mechanical bearing, the inertially stabilized platform suspended by active magnetic bearings has characteristics on minimizing friction and improving control precision. The inner azimuth frame is suspended by active magnetic bearings which are non-contact and elastic levitation method, and the disturbance of external frames can be effectively isolated, so vibration is not transferred from external frames to inner azimuth frame. Therefore, the inertially stabilized platform suspended by active magnetic bearings owns high suspension precision. In addition, the tilting of inner azimuth frame is actively controllable by regulating axial magnetic force. In this article, the characteristics of active magnetic bearings are analyzed, and active controllability and suspension performance of inner azimuth frame are tested, the experimental results indicate that the suspension precision of inner azimuth frame had been improved.
{"title":"Suspension Characteristics of Magnetically Suspended Frame in Inertially Stabilized Platform","authors":"B. Xiang, W. Wong","doi":"10.1109/EPEPEMC.2018.8521921","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2018.8521921","url":null,"abstract":"Comparing with the normal inertially stabilized platform supported by the mechanical bearing, the inertially stabilized platform suspended by active magnetic bearings has characteristics on minimizing friction and improving control precision. The inner azimuth frame is suspended by active magnetic bearings which are non-contact and elastic levitation method, and the disturbance of external frames can be effectively isolated, so vibration is not transferred from external frames to inner azimuth frame. Therefore, the inertially stabilized platform suspended by active magnetic bearings owns high suspension precision. In addition, the tilting of inner azimuth frame is actively controllable by regulating axial magnetic force. In this article, the characteristics of active magnetic bearings are analyzed, and active controllability and suspension performance of inner azimuth frame are tested, the experimental results indicate that the suspension precision of inner azimuth frame had been improved.","PeriodicalId":251046,"journal":{"name":"2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116842737","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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