Pub Date : 2017-12-14DOI: 10.1109/INTLEC.2017.8214177
M. Aly, E. Ahmed, M. Shoyama
Multilevel Inverters play key role in grid integration of photovoltaic (PV) systems. Although power semiconductor devices in multilevel inverters represent the most expensive and vulnerable parts according to the recent reliability surveys. Thermal stresses in power semiconductor devices represent the main cause of their failures. Therefore, improved controllers with lower thermal stresses are highly demanded. Conventional finite control set model predictive control (MPC) utilizes a high sampling rate to select the optimum switching state from all possible states. Consequently, high power losses and high thermal stresses are produced in this type. This paper introduces an improved model predictive controller (MPC) for preserving high reliability for grid connected single phase full bridge five level T-type inverter. The proposed controller selects the optimum switching sequence to drive the inverter from a set of switching sequences with an optimized switching transitions. The proposed MPC features constant switching frequency with minimized switching transitions of power devices and voltage balance of DC-link capacitors. The results of the designed and implemented case study are presented to validate the superiority of the proposed controller.
{"title":"An improved model predictive controller for highly reliable grid connected photovoltaic multilevel inverters","authors":"M. Aly, E. Ahmed, M. Shoyama","doi":"10.1109/INTLEC.2017.8214177","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214177","url":null,"abstract":"Multilevel Inverters play key role in grid integration of photovoltaic (PV) systems. Although power semiconductor devices in multilevel inverters represent the most expensive and vulnerable parts according to the recent reliability surveys. Thermal stresses in power semiconductor devices represent the main cause of their failures. Therefore, improved controllers with lower thermal stresses are highly demanded. Conventional finite control set model predictive control (MPC) utilizes a high sampling rate to select the optimum switching state from all possible states. Consequently, high power losses and high thermal stresses are produced in this type. This paper introduces an improved model predictive controller (MPC) for preserving high reliability for grid connected single phase full bridge five level T-type inverter. The proposed controller selects the optimum switching sequence to drive the inverter from a set of switching sequences with an optimized switching transitions. The proposed MPC features constant switching frequency with minimized switching transitions of power devices and voltage balance of DC-link capacitors. The results of the designed and implemented case study are presented to validate the superiority of the proposed controller.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127114511","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 : 2017-12-14DOI: 10.1109/INTLEC.2017.8214190
Daigoro Ebisumoto, S. Kimura, K. Nanamori, M. Noah, Masataka Ishihara, J. Imaoka, Masayoshi Yamamoto
Interleaved techniques and magnetic integration in a boost converter have gained attention in electric powertrains system for electric, hybrid and fuel cell vehicles in order to achieve high power density or to improve power conversion efficiency. Furthermore, the proposed multi-phase boost converter is equipped with a phase drive control to improve the efficiency at all load ranges. Furthermore, a design method of a coupled-inductor for an interleaved boost converter with phase drive control is also proposed. However, the interleaved DC-DC converter using coupled method with phase drive control has many problems. In this paper, this problem of interleaved DC-DC converter using coupled inductor with phase drive control (PDC) is analyzed. In addition, defensive method of this method.
{"title":"Analytical investigation of interleaved DC-DC converter using closed-coupled inductor with phase drive control","authors":"Daigoro Ebisumoto, S. Kimura, K. Nanamori, M. Noah, Masataka Ishihara, J. Imaoka, Masayoshi Yamamoto","doi":"10.1109/INTLEC.2017.8214190","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214190","url":null,"abstract":"Interleaved techniques and magnetic integration in a boost converter have gained attention in electric powertrains system for electric, hybrid and fuel cell vehicles in order to achieve high power density or to improve power conversion efficiency. Furthermore, the proposed multi-phase boost converter is equipped with a phase drive control to improve the efficiency at all load ranges. Furthermore, a design method of a coupled-inductor for an interleaved boost converter with phase drive control is also proposed. However, the interleaved DC-DC converter using coupled method with phase drive control has many problems. In this paper, this problem of interleaved DC-DC converter using coupled inductor with phase drive control (PDC) is analyzed. In addition, defensive method of this method.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129557994","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 : 2017-12-14DOI: 10.1109/INTLEC.2017.8214169
Baihua Zhang, Qiang Lin, J. Imaoka, M. Shoyama, S. Tomioka, E. Takegami
This paper focuses on zero-crossing spike current issue in totem-pole bridgeless PFC converter. Spike current occurs at every input voltage zero-crossing and becomes a severe conducted common mode noise source. The zero-crossing issue is discussed by theoretical analysis and mathematical calculation, the conducted noise caused by zero-crossing issue can be predicted by calculating Fourier coefficient of approximate spike current waveform. Based on the analysis, a noise reduction method is proposed to solve zero-crossing issue. Finally, the experiments are achieved on a GaN-based totem-pole bridgeless PFC converter and show that the common mode conducted noise caused by spike current can by reduced effectively.
{"title":"Conducted noise prediction for zero-crossing issue in totem-pole bridgeless PFC converter","authors":"Baihua Zhang, Qiang Lin, J. Imaoka, M. Shoyama, S. Tomioka, E. Takegami","doi":"10.1109/INTLEC.2017.8214169","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214169","url":null,"abstract":"This paper focuses on zero-crossing spike current issue in totem-pole bridgeless PFC converter. Spike current occurs at every input voltage zero-crossing and becomes a severe conducted common mode noise source. The zero-crossing issue is discussed by theoretical analysis and mathematical calculation, the conducted noise caused by zero-crossing issue can be predicted by calculating Fourier coefficient of approximate spike current waveform. Based on the analysis, a noise reduction method is proposed to solve zero-crossing issue. Finally, the experiments are achieved on a GaN-based totem-pole bridgeless PFC converter and show that the common mode conducted noise caused by spike current can by reduced effectively.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122266313","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 : 2017-10-22DOI: 10.1109/INTLEC.2017.8214147
Xicai Yue, J. Kiely, A. Farooq, A. Champneys
The supercapacitor is a candidate energy storage component for energy harvesting powered autonomous wireless sensor node aiming to achieve battery replacement-free, “fit and forget” sensor node in low-power IoT applications. The leakage current of the supercapacitor provided by the manufacturer is tested long after post-charge, raising a concern relating to the uncertainty of the dynamic leakage current in the IoT applications where the supercapacitor frequently charges and discharges. This paper investigates the charge redistribution process which causes an equivalent capacitance change of the supercapacitor in a full IoT measurement period, and then proposes an experiment design to measure the dynamic leakage current of a supercapacitor for an IoT application. The results showed that the charge redistribution process is completed long before the end of the sleep period due to the low ratio of the amount of discharge in an active period to the total amount of charge the supercapacitor holds. It also showed that the average dynamic leakage current in an entire measurement period corresponds to the value provided by the manufacturer, indicating that leakage current is not an issue when supercapacitors is used for low-power IoT applications.
{"title":"Estimation of the dynamic leakage current of a supercapacitor in energy harvesting powered autonomous wireless sensor nodes","authors":"Xicai Yue, J. Kiely, A. Farooq, A. Champneys","doi":"10.1109/INTLEC.2017.8214147","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214147","url":null,"abstract":"The supercapacitor is a candidate energy storage component for energy harvesting powered autonomous wireless sensor node aiming to achieve battery replacement-free, “fit and forget” sensor node in low-power IoT applications. The leakage current of the supercapacitor provided by the manufacturer is tested long after post-charge, raising a concern relating to the uncertainty of the dynamic leakage current in the IoT applications where the supercapacitor frequently charges and discharges. This paper investigates the charge redistribution process which causes an equivalent capacitance change of the supercapacitor in a full IoT measurement period, and then proposes an experiment design to measure the dynamic leakage current of a supercapacitor for an IoT application. The results showed that the charge redistribution process is completed long before the end of the sleep period due to the low ratio of the amount of discharge in an active period to the total amount of charge the supercapacitor holds. It also showed that the average dynamic leakage current in an entire measurement period corresponds to the value provided by the manufacturer, indicating that leakage current is not an issue when supercapacitors is used for low-power IoT applications.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133874067","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8211671
G. Mutani, A. Vodano, M. Pastorelli
The paper deals with the transformation of the existing bus shelters for the public transport into smart systems equipped with Wi-Fi stations, USB chargers and Air Quality Control Station. The proposed smart shelters are renewable energy producer since they are equipped with PV modules. The location of the most suitable bus shelters is defined by solar irradiation maps based on a GIS tool. Four solutions are proposed with a cost-benefits analysis.
{"title":"Photovoltaic solar systems for smart bus shelters in the urban environment of turin (Italy)","authors":"G. Mutani, A. Vodano, M. Pastorelli","doi":"10.1109/INTLEC.2017.8211671","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8211671","url":null,"abstract":"The paper deals with the transformation of the existing bus shelters for the public transport into smart systems equipped with Wi-Fi stations, USB chargers and Air Quality Control Station. The proposed smart shelters are renewable energy producer since they are equipped with PV modules. The location of the most suitable bus shelters is defined by solar irradiation maps based on a GIS tool. Four solutions are proposed with a cost-benefits analysis.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115265729","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8214176
C. Baier, Claudio Flores, Manuel A. Díaz, M. Torres, J. Pou, P. Melín, E. Espinosa
Impedance source inverters have attracted much attention in recent years due to their ability to behave as voltage elevators/reducers at their output terminals without the need of an extra dc/dc converter to accomplish this task. Among these inverters, the quasi-impedance source inverter (qZSI) is one of the most known topologies. It considers two basic operating states, the no-shoot-through state (nSTS) and the shoot-through state (STS). One of the major drawbacks of the qZSI is that the STS can present significant power losses mainly due to the voltage drop in the semiconductors that activate this state. This work presents a simple alternative of implementation that allows reducing these losses up to 50% during the STS, thus increasing the overall efficiency of the impedance source inverters.
{"title":"Reducing losses in the shoot-through state of a single-phase quasi-z-source inverter","authors":"C. Baier, Claudio Flores, Manuel A. Díaz, M. Torres, J. Pou, P. Melín, E. Espinosa","doi":"10.1109/INTLEC.2017.8214176","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214176","url":null,"abstract":"Impedance source inverters have attracted much attention in recent years due to their ability to behave as voltage elevators/reducers at their output terminals without the need of an extra dc/dc converter to accomplish this task. Among these inverters, the quasi-impedance source inverter (qZSI) is one of the most known topologies. It considers two basic operating states, the no-shoot-through state (nSTS) and the shoot-through state (STS). One of the major drawbacks of the qZSI is that the STS can present significant power losses mainly due to the voltage drop in the semiconductors that activate this state. This work presents a simple alternative of implementation that allows reducing these losses up to 50% during the STS, thus increasing the overall efficiency of the impedance source inverters.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"28 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120910396","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8211683
E. B. Haghighi
Free cooling is a well-proven method for reducing power consumption in thermal management of telecommunication base stations compared with traditional approach (running air conditioning all over the year). However, some operators still have some concerns in using free cooling especially when outdoor air is very humid or polluted. This article addresses the humidity concerns with an analytical approach. Basically, by increasing the temperature, the humidity ratio is reduced. Based on this principle an analytical model is applied for some case studies. Based on the results, if the temperature for an extremely humid air (relative humidity of 99%) is increased in the range of 2–3 °C, its humidity is reduced to a risk-free level (85%). Furthermore, this article suggests some controlling strategies and a concept design for servers that potentially reduce risk of damaging IT equipment in humid weather condition.
{"title":"Free cooling and indoor humidity level in telecommunication base stations","authors":"E. B. Haghighi","doi":"10.1109/INTLEC.2017.8211683","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8211683","url":null,"abstract":"Free cooling is a well-proven method for reducing power consumption in thermal management of telecommunication base stations compared with traditional approach (running air conditioning all over the year). However, some operators still have some concerns in using free cooling especially when outdoor air is very humid or polluted. This article addresses the humidity concerns with an analytical approach. Basically, by increasing the temperature, the humidity ratio is reduced. Based on this principle an analytical model is applied for some case studies. Based on the results, if the temperature for an extremely humid air (relative humidity of 99%) is increased in the range of 2–3 °C, its humidity is reduced to a risk-free level (85%). Furthermore, this article suggests some controlling strategies and a concept design for servers that potentially reduce risk of damaging IT equipment in humid weather condition.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128699921","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8214170
Yuntong Li, G. Moschopoulos
AC-DC single-stage converters are widely used in industrial applications because they are cheaper than conventional two-stage converters. In this paper, state of the art low power single-stage converters are reviewed. These converters are classified into several types in the paper, the operation of an example converter of each type is discussed, and the advantages and drawbacks of each type are stated. A new single-stage AC-DC converter that does not have many of the drawbacks of other single-stage converters is then proposed. The operation and features of this converter are discussed and experimental results obtained from a prototype converter are presented to confirm its feasibility.
{"title":"State of the art low power AC-DC single-stage converters","authors":"Yuntong Li, G. Moschopoulos","doi":"10.1109/INTLEC.2017.8214170","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214170","url":null,"abstract":"AC-DC single-stage converters are widely used in industrial applications because they are cheaper than conventional two-stage converters. In this paper, state of the art low power single-stage converters are reviewed. These converters are classified into several types in the paper, the operation of an example converter of each type is discussed, and the advantages and drawbacks of each type are stated. A new single-stage AC-DC converter that does not have many of the drawbacks of other single-stage converters is then proposed. The operation and features of this converter are discussed and experimental results obtained from a prototype converter are presented to confirm its feasibility.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129298292","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8214184
Y. Kafle, S. Hasan, M. Kashif, Jahangir Hossain, G. Town
This paper presents a new shoot-through control method applicable for an impedance source galvanically isolated DC/DC converter. In impedance source converters, the introduction of shoot-through states increases the switching speed of H-bridge switches about two to three times the switching frequency. This approach reduces the switching transient of all switches of inverters by commutating them once in a switching cycle. The shoot-through states are generated by alternatively switching the single leg of the inverter whereas, in baseline modulation approach, all the switches are turned on during shoot-through states. This method decreases the switching loss of front-end converters and independent controllability of active and shoot through states. This modulation technique is applied and validated to a voltage-feed Quasi-Z source isolated DC-DC converter with a voltage doubling rectifier.
{"title":"A new PWM Shoot-through control for voltage-fed quasi-z-source DC/DC converters","authors":"Y. Kafle, S. Hasan, M. Kashif, Jahangir Hossain, G. Town","doi":"10.1109/INTLEC.2017.8214184","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214184","url":null,"abstract":"This paper presents a new shoot-through control method applicable for an impedance source galvanically isolated DC/DC converter. In impedance source converters, the introduction of shoot-through states increases the switching speed of H-bridge switches about two to three times the switching frequency. This approach reduces the switching transient of all switches of inverters by commutating them once in a switching cycle. The shoot-through states are generated by alternatively switching the single leg of the inverter whereas, in baseline modulation approach, all the switches are turned on during shoot-through states. This method decreases the switching loss of front-end converters and independent controllability of active and shoot through states. This modulation technique is applied and validated to a voltage-feed Quasi-Z source isolated DC-DC converter with a voltage doubling rectifier.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"367 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121381286","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 : 2017-10-01DOI: 10.1109/INTLEC.2017.8214203
S. Horie, T. Matsumura, K. Hirose, K. Yukita, Y. Goto, Hiroaki Miyoshi
In recent years, the introduction of solar power generation equipment has increased as distributed power supply has increased. A power conditioning subsystem (PCS) of a solar power generation system is an apparatus using an integrated circuit. Switching noise is generated because the inverter, which is the main constituent element of the PCS, performs DC-AC conversion through high-frequency switching. The power supply noise generated at the AC side output terminal connected to the distribution line is regulated by the CISPR standard as a power line conduction disturbance wave, and the amount of electromagnetic disturbance generated is regulated in most countries around the world. However, there is currently no CISPR standard on the amount of generated electromagnetic interference for photovoltaic power generation systems. In recent years, however this topic is being studied for standardization. Therefore, in this paper, noise measurement was carried out at the PCS of a solar power generation system and was subsequently examined.
{"title":"A consideration on current noise measurement in distributed power supply introduction system","authors":"S. Horie, T. Matsumura, K. Hirose, K. Yukita, Y. Goto, Hiroaki Miyoshi","doi":"10.1109/INTLEC.2017.8214203","DOIUrl":"https://doi.org/10.1109/INTLEC.2017.8214203","url":null,"abstract":"In recent years, the introduction of solar power generation equipment has increased as distributed power supply has increased. A power conditioning subsystem (PCS) of a solar power generation system is an apparatus using an integrated circuit. Switching noise is generated because the inverter, which is the main constituent element of the PCS, performs DC-AC conversion through high-frequency switching. The power supply noise generated at the AC side output terminal connected to the distribution line is regulated by the CISPR standard as a power line conduction disturbance wave, and the amount of electromagnetic disturbance generated is regulated in most countries around the world. However, there is currently no CISPR standard on the amount of generated electromagnetic interference for photovoltaic power generation systems. In recent years, however this topic is being studied for standardization. Therefore, in this paper, noise measurement was carried out at the PCS of a solar power generation system and was subsequently examined.","PeriodicalId":366207,"journal":{"name":"2017 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124026760","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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