Pub Date : 2010-06-15DOI: 10.1109/ICIEA.2010.5515085
Hung-Ching Lu, Te-Lung Shih
This paper demonstrates the Maximum Power Point Tracking (MPPT) controller that uses a DC/DC Boost converter with a Fuzzy Neural Network (FNN) system. It simplifies the topology of the DC/DC boost converter model to state equations, which is easy to simulate with Matlab. Additionally, the FNN system uses an integrated Fuzzy and Neural Network (NN), which advantages include uncertainty information processing and neural network learning. After assigning a suitable structure, we adjust the membership function and assign the algorithm weighting to track the maximum power point effectively in the parameters leaning process. The simulation result has verified the system to be efficient and rapid in tracking the MPP and converting the power from solar cells into the battery bank.
{"title":"Design of DC/DC Boost converter with FNN solar cell Maximum Power Point Tracking controller","authors":"Hung-Ching Lu, Te-Lung Shih","doi":"10.1109/ICIEA.2010.5515085","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515085","url":null,"abstract":"This paper demonstrates the Maximum Power Point Tracking (MPPT) controller that uses a DC/DC Boost converter with a Fuzzy Neural Network (FNN) system. It simplifies the topology of the DC/DC boost converter model to state equations, which is easy to simulate with Matlab. Additionally, the FNN system uses an integrated Fuzzy and Neural Network (NN), which advantages include uncertainty information processing and neural network learning. After assigning a suitable structure, we adjust the membership function and assign the algorithm weighting to track the maximum power point effectively in the parameters leaning process. The simulation result has verified the system to be efficient and rapid in tracking the MPP and converting the power from solar cells into the battery bank.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128195754","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515878
He Li-gao, Wu Jian
The general way to design the output inductor is taking the critical discontinue current as the basis, then selecting the inductor current ripple according to the experiential equations to calculate the inductor value. This method neglects the effects of the inductor current ripple on the overall stresses of the converter, and can't provides ideal output inductor values, so it will affect the actual performance of the converter. In order to solve the shortcoming, the theoretical basis for selecting the current ripple ratio of Buck converter is analyzed deeply and an optimal design method of the output inductor is proposed in this paper. The overall stresses of the converter, the size of the filter inductor and dynamic performance of the converter are all considered in the proposed method. The optimum value of current ripple ratio is set at about 0.4 finally. The filter inductor value, which is calcultated in terms of the determined current ripple ratio, would not affect the dynamic performance of the converter, and the design of the converter is optimized. The correctness of theoretical analysis and the feasibility of the proposed method are verified by the simulation and experimental results.
{"title":"Selection of the current ripple ratio of converters and optimal design of output inductor","authors":"He Li-gao, Wu Jian","doi":"10.1109/ICIEA.2010.5515878","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515878","url":null,"abstract":"The general way to design the output inductor is taking the critical discontinue current as the basis, then selecting the inductor current ripple according to the experiential equations to calculate the inductor value. This method neglects the effects of the inductor current ripple on the overall stresses of the converter, and can't provides ideal output inductor values, so it will affect the actual performance of the converter. In order to solve the shortcoming, the theoretical basis for selecting the current ripple ratio of Buck converter is analyzed deeply and an optimal design method of the output inductor is proposed in this paper. The overall stresses of the converter, the size of the filter inductor and dynamic performance of the converter are all considered in the proposed method. The optimum value of current ripple ratio is set at about 0.4 finally. The filter inductor value, which is calcultated in terms of the determined current ripple ratio, would not affect the dynamic performance of the converter, and the design of the converter is optimized. The correctness of theoretical analysis and the feasibility of the proposed method are verified by the simulation and experimental results.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130482858","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}
Multilevel voltage technology is widely used in power electric engineering, and the associated modulation method, especially the space vector pulse width modulation (SVPWM) method is researched widely. However, the SVPWM process always becomes complicated when the voltage level increases. Thus this paper presented one generalized fast multilevel SVPWM method, which is based on phase voltage construction so has clear physical concept. The method includes base switch vector selection, dwell time calculation, the switch sequence generation considering redundant states. The method is simple to implement as less calculation, lower memory space, without any lookup table, and the complexity has no relationship with the voltage level exhibiting excellent universality. The simulation results demonstrate the validity of this algorithm.
{"title":"A fast generalized multilevel voltage SVPWM algorithm based on voltage decomposition","authors":"Rongfeng Yang, Gaolin Wang, Yong Yu, Dianguo Xu, Zhuang Xu","doi":"10.1109/ICIEA.2010.5515634","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515634","url":null,"abstract":"Multilevel voltage technology is widely used in power electric engineering, and the associated modulation method, especially the space vector pulse width modulation (SVPWM) method is researched widely. However, the SVPWM process always becomes complicated when the voltage level increases. Thus this paper presented one generalized fast multilevel SVPWM method, which is based on phase voltage construction so has clear physical concept. The method includes base switch vector selection, dwell time calculation, the switch sequence generation considering redundant states. The method is simple to implement as less calculation, lower memory space, without any lookup table, and the complexity has no relationship with the voltage level exhibiting excellent universality. The simulation results demonstrate the validity of this algorithm.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"52 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134020808","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5516796
Eunjeong Lee
This paper discusses the design of a flexible micro robotic fish that takes advantage of the energy saving feature of fish. The body of the fish is made of soft material with embedded electromagnets. It has a flexure link made of polyimide. Carbon-fiber reinforced composite material sandwiches the flexible link at four locations, allowing the four rigid links to be connected by a flexure joint. Nd-Fe-B magnets and planar coils are secured to the top of the composite material. The entire structure, including Li-ion battery and electronics, is embedded within polydimethylsiloxane (PDMS) sheets. It is then cut into the shape of a fish. The propagating muscle activity pattern is achieved by activating the electromagnets that correspond to each muscle group. The fish has polyvinylidene-fluoride-trifluoroethylene (PVDF-TrFE) piezoelectric polymer sensors on its surface to measure the local flow pressure. When it senses vortices, the fish automatically turns off the actuator so that its body wave can be passively generated by interaction with the oncoming flow of water. The power generated for positive work can be stored as elastic energy and then used for negative work, thus saving energy. The system is driven at its natural frequency to minimize energy consumption. Future generations of this microbotic fish could be deployed for underwater oil exploration and environmental monitoring.
{"title":"Design of a soft and autonomous biomimetic micro-robotic fish","authors":"Eunjeong Lee","doi":"10.1109/ICIEA.2010.5516796","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5516796","url":null,"abstract":"This paper discusses the design of a flexible micro robotic fish that takes advantage of the energy saving feature of fish. The body of the fish is made of soft material with embedded electromagnets. It has a flexure link made of polyimide. Carbon-fiber reinforced composite material sandwiches the flexible link at four locations, allowing the four rigid links to be connected by a flexure joint. Nd-Fe-B magnets and planar coils are secured to the top of the composite material. The entire structure, including Li-ion battery and electronics, is embedded within polydimethylsiloxane (PDMS) sheets. It is then cut into the shape of a fish. The propagating muscle activity pattern is achieved by activating the electromagnets that correspond to each muscle group. The fish has polyvinylidene-fluoride-trifluoroethylene (PVDF-TrFE) piezoelectric polymer sensors on its surface to measure the local flow pressure. When it senses vortices, the fish automatically turns off the actuator so that its body wave can be passively generated by interaction with the oncoming flow of water. The power generated for positive work can be stored as elastic energy and then used for negative work, thus saving energy. The system is driven at its natural frequency to minimize energy consumption. Future generations of this microbotic fish could be deployed for underwater oil exploration and environmental monitoring.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128929768","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515169
C. Karnjanapiboon, K. Jirasereeamornkul, V. Monyakul
This article present charge equalized module using quasi-resonant flyback converter with DC-link bus strategy. With this technique, turn on switching loss is decrease by 71 percent. Switching at low voltage and operating at low dv/dt, the electromagnetic interferences are also decline. By applied this proposed technique to the charge equalized system, the unbalance charging problem can be eliminated. The validity of this approach can be supported by computer simulation and experimental result.
{"title":"Charge equalized module for serially connected VRLA battery string using quasi-resonant flyback converter","authors":"C. Karnjanapiboon, K. Jirasereeamornkul, V. Monyakul","doi":"10.1109/ICIEA.2010.5515169","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515169","url":null,"abstract":"This article present charge equalized module using quasi-resonant flyback converter with DC-link bus strategy. With this technique, turn on switching loss is decrease by 71 percent. Switching at low voltage and operating at low dv/dt, the electromagnetic interferences are also decline. By applied this proposed technique to the charge equalized system, the unbalance charging problem can be eliminated. The validity of this approach can be supported by computer simulation and experimental result.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130826608","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514921
S. Sue, Yi-Shuo Huang, J. Syu, Chengwei Sun
This paper presents a bi-directional power flow interior permanent magnet brushless DC (IPM-BLDC) motor drive for electrical scooters. A new control scheme is proposed for the motoring operation. It has high energy conversion efficiency in the low speed and high torque region as well as high speed region. The basic control idea follows the maximum torque per ampere (MTPA) control of an interior permanent magnet synchronous motor (IPMSM). For the regenerative braking operation, a new switching pattern of the one switch active scheme is presented. It can provide a quite symmetry line current waveform for smooth regenerative braking. A low cost digital signal processor is used to implement the control core to reduce the development cost. Experimental results show that the proposed scheme can provide a smooth output torque and can improve the drive efficiency for the motoring operation as well as that the performance of the regenerative braking is quite satisfactory.
{"title":"A bi-directional power flow IPM-BLDC motor drive for electrical scooters","authors":"S. Sue, Yi-Shuo Huang, J. Syu, Chengwei Sun","doi":"10.1109/ICIEA.2010.5514921","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514921","url":null,"abstract":"This paper presents a bi-directional power flow interior permanent magnet brushless DC (IPM-BLDC) motor drive for electrical scooters. A new control scheme is proposed for the motoring operation. It has high energy conversion efficiency in the low speed and high torque region as well as high speed region. The basic control idea follows the maximum torque per ampere (MTPA) control of an interior permanent magnet synchronous motor (IPMSM). For the regenerative braking operation, a new switching pattern of the one switch active scheme is presented. It can provide a quite symmetry line current waveform for smooth regenerative braking. A low cost digital signal processor is used to implement the control core to reduce the development cost. Experimental results show that the proposed scheme can provide a smooth output torque and can improve the drive efficiency for the motoring operation as well as that the performance of the regenerative braking is quite satisfactory.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130890042","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515361
Longcheng Tan, Zhenggang Yin, X. Lv, Kai Tan, Shutian Zhang, Congwei Liu, Qiongxuan Ge, Yao-hua Li
In order to eliminate the even order harmonic currents of the NPC rectifiers, the modified SVM (short for NP-SVM) is proposed in the past. However, when the NP-SVM is used in the multi-sampling system, there will be direct jumps between N and P which can result in narrower pulse width, higher dv/dt, even the destruction of devices, which is very undesirable. In this paper, the reasons of direct NP jumps generation are briefly analyzed at first, then an improved NP-SVM(INP-SVM) suitable for multi-sampling system is proposed to overcome the problems in high power three level NPC rectifiers. Finally, all these analyses and the effectiveness of the proposed NP-SVM are firstly validated by simulation, and then are verified further in a 75kVA laboratory prototype.
{"title":"Improved NP-SVM suitable for multi-sampling used in high power NPC rectifiers without even order harmonics","authors":"Longcheng Tan, Zhenggang Yin, X. Lv, Kai Tan, Shutian Zhang, Congwei Liu, Qiongxuan Ge, Yao-hua Li","doi":"10.1109/ICIEA.2010.5515361","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515361","url":null,"abstract":"In order to eliminate the even order harmonic currents of the NPC rectifiers, the modified SVM (short for NP-SVM) is proposed in the past. However, when the NP-SVM is used in the multi-sampling system, there will be direct jumps between N and P which can result in narrower pulse width, higher dv/dt, even the destruction of devices, which is very undesirable. In this paper, the reasons of direct NP jumps generation are briefly analyzed at first, then an improved NP-SVM(INP-SVM) suitable for multi-sampling system is proposed to overcome the problems in high power three level NPC rectifiers. Finally, all these analyses and the effectiveness of the proposed NP-SVM are firstly validated by simulation, and then are verified further in a 75kVA laboratory prototype.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132669185","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515658
Chung-Wen Hung, Jhih-Han Chen, Li Chang, Cheng-Han Li
A low-end MCU base power factor corrector (PFC) is proposed in this paper. Due to green power issue, PFC is more important, but need an extra controller to achieve. However, in most electric equipments and appliances, the MCU is used to accomplish key functions or handle user interface. The structure and control strategy proposed in this paper is based on the rest calculation resource of the MCU build in appliances. The simulation results show the method is workable, the quantization effect caused by build in ADC and PWM timer of MCU are also considered in simulation stage. The experimental results are present in the paper to show the scheme is workable.
{"title":"A simple strategy of power factor correction based on low-end MCU","authors":"Chung-Wen Hung, Jhih-Han Chen, Li Chang, Cheng-Han Li","doi":"10.1109/ICIEA.2010.5515658","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515658","url":null,"abstract":"A low-end MCU base power factor corrector (PFC) is proposed in this paper. Due to green power issue, PFC is more important, but need an extra controller to achieve. However, in most electric equipments and appliances, the MCU is used to accomplish key functions or handle user interface. The structure and control strategy proposed in this paper is based on the rest calculation resource of the MCU build in appliances. The simulation results show the method is workable, the quantization effect caused by build in ADC and PWM timer of MCU are also considered in simulation stage. The experimental results are present in the paper to show the scheme is workable.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133131501","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515489
Zhang Yong-xiang, Wei-gong Zhang, Quan Zhou, Rui Ding, Yuanyuan Shang
Based on the standard MIL-STD-1553B bus military aviation description, this paper detailed analyses the character type of transmission protocol, information transmission format, and the internal registers and RAM resources of 1553B RT interface chip BU-61580 is described. The designs of hardware interface and software of the bus based on the BU-61580 and 32-bit SPARC V8 processor is introduced, and achieved the high reliability data communication between the 1553B terminal RT and bus controller BC.
{"title":"The design of 1553B communication bus based of BU-61580","authors":"Zhang Yong-xiang, Wei-gong Zhang, Quan Zhou, Rui Ding, Yuanyuan Shang","doi":"10.1109/ICIEA.2010.5515489","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515489","url":null,"abstract":"Based on the standard MIL-STD-1553B bus military aviation description, this paper detailed analyses the character type of transmission protocol, information transmission format, and the internal registers and RAM resources of 1553B RT interface chip BU-61580 is described. The designs of hardware interface and software of the bus based on the BU-61580 and 32-bit SPARC V8 processor is introduced, and achieved the high reliability data communication between the 1553B terminal RT and bus controller BC.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133255497","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515009
Chia-Ching Lin, Wen-Bin Lin, H. Chiang, Chien-An Chen
High concentration alkali has been used for waste disk recycling treatment for many years. This paper proposes a novel process to handle recycling with a high voltage high frequency arc-discharge. This process can replace the original recycling process, which smashes the disks up and then separates metal cladding material from the disks, and reduce secondary pollution. The proposed approach instantly changes the metal cladding material temperature of the disk surface. The different coefficients of expansion between plastics and metal cladding material can be used to strip the disk surfaces. The variation of stripped quantity and the influence of polycarbonate (PC) structures were investigated using various voltages, frequencies, and discharging times. In the field tests, both the treatment time of waste disks and the influence of recycling quantities were improved effectively.
{"title":"The development technology to recycle waste compact disk treatment by arc-discharge","authors":"Chia-Ching Lin, Wen-Bin Lin, H. Chiang, Chien-An Chen","doi":"10.1109/ICIEA.2010.5515009","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515009","url":null,"abstract":"High concentration alkali has been used for waste disk recycling treatment for many years. This paper proposes a novel process to handle recycling with a high voltage high frequency arc-discharge. This process can replace the original recycling process, which smashes the disks up and then separates metal cladding material from the disks, and reduce secondary pollution. The proposed approach instantly changes the metal cladding material temperature of the disk surface. The different coefficients of expansion between plastics and metal cladding material can be used to strip the disk surfaces. The variation of stripped quantity and the influence of polycarbonate (PC) structures were investigated using various voltages, frequencies, and discharging times. In the field tests, both the treatment time of waste disks and the influence of recycling quantities were improved effectively.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128873387","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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