Pub Date : 2012-05-21DOI: 10.1109/APEMC.2012.6237997
Yin-Cheng Chang, Bing-Yi Wang, S. Hsu, Yen-Tang Chang, Chiu-Kuo Chen, Y. Juang, Hsu-Chen Cheng, D. Chang
The evaluation flow for estimating the EMC behavior of RF ICs is proposed. Conducting the electronic design automation (EDA) tools, the evaluation flow naturally embeds in the conventional RF IC design flow and extracts the resistor, inductor, and capacitor components of the network efficiently. The results of the evaluation flow help the IC designer to generate the integrated circuit emission model (ICEM) composed of internal activity (IA) and power distribution network (PDN). It is useful for the co-design of IC, package, and board regarding the system-level EMC behavior in the very early design phase. The measured impedance of the PDN shows that the proposed flow is able to improve the accuracy of the predicted impedance. Additionally, the measured results of a board carrying an RF IC and being compliant with IEC-61967 show the proposed evaluation flow captures the salient properties of the spectrum emitted by the RF IC.
{"title":"The evaluation flow for EMC behavior of RF ICs","authors":"Yin-Cheng Chang, Bing-Yi Wang, S. Hsu, Yen-Tang Chang, Chiu-Kuo Chen, Y. Juang, Hsu-Chen Cheng, D. Chang","doi":"10.1109/APEMC.2012.6237997","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237997","url":null,"abstract":"The evaluation flow for estimating the EMC behavior of RF ICs is proposed. Conducting the electronic design automation (EDA) tools, the evaluation flow naturally embeds in the conventional RF IC design flow and extracts the resistor, inductor, and capacitor components of the network efficiently. The results of the evaluation flow help the IC designer to generate the integrated circuit emission model (ICEM) composed of internal activity (IA) and power distribution network (PDN). It is useful for the co-design of IC, package, and board regarding the system-level EMC behavior in the very early design phase. The measured impedance of the PDN shows that the proposed flow is able to improve the accuracy of the predicted impedance. Additionally, the measured results of a board carrying an RF IC and being compliant with IEC-61967 show the proposed evaluation flow captures the salient properties of the spectrum emitted by the RF IC.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130890415","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237907
Yang Fan, V. Rimali, M. Tang, C. Nayar
This paper presents the design and implementation of an intelligent micro-grid with high percentage of clean and renewable energy resources on Pulau Ubin Island to meet existing and future electricity demand. Pulau Ubin is one of the rare enclaves in highly urbanized Singapore to maintain its rustic charm of “village” life, which is representative of Singapore in her early days of development. The system design has considered all possible energy sources, energy conversion efficiency, power demand, as well as environmental and economic concerns. Photovoltaic (PV), bio-diesel powered doubly fed induction generators are utilized to generate electricity. Energy storage system has been properly sized to maximize the use of renewable energy and to prolong the battery life. Smart-grid technologies, including smart meters, micro grid controller, and remote monitoring system with SCADA functions have been employed to optimize the energy generation, monitor energy consumption, manage instantaneous power flow, maintain electricity quality, and generate fault alerts. This project also serves as a platform for the test-bedding of clean and renewable energy generation and storage as well as advanced grid control technologies under an intelligent Micro-grid infrastructure. These smart grid features have the great potential to be applied to grid connected micro grids. Upon the successful implementation of this system, it can serve as a model of sustainable development for many areas in Asia, of which roughly 40% of its population have little or no access to electricity.
{"title":"Design and Implementation of stand-alone smart grid employing renewable energy resources on Pulau Ubin Island of Singapore","authors":"Yang Fan, V. Rimali, M. Tang, C. Nayar","doi":"10.1109/APEMC.2012.6237907","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237907","url":null,"abstract":"This paper presents the design and implementation of an intelligent micro-grid with high percentage of clean and renewable energy resources on Pulau Ubin Island to meet existing and future electricity demand. Pulau Ubin is one of the rare enclaves in highly urbanized Singapore to maintain its rustic charm of “village” life, which is representative of Singapore in her early days of development. The system design has considered all possible energy sources, energy conversion efficiency, power demand, as well as environmental and economic concerns. Photovoltaic (PV), bio-diesel powered doubly fed induction generators are utilized to generate electricity. Energy storage system has been properly sized to maximize the use of renewable energy and to prolong the battery life. Smart-grid technologies, including smart meters, micro grid controller, and remote monitoring system with SCADA functions have been employed to optimize the energy generation, monitor energy consumption, manage instantaneous power flow, maintain electricity quality, and generate fault alerts. This project also serves as a platform for the test-bedding of clean and renewable energy generation and storage as well as advanced grid control technologies under an intelligent Micro-grid infrastructure. These smart grid features have the great potential to be applied to grid connected micro grids. Upon the successful implementation of this system, it can serve as a model of sustainable development for many areas in Asia, of which roughly 40% of its population have little or no access to electricity.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131303276","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237979
Y. Horii
This paper introduces research history of multi-layered composite right/left-handed transmission lines (ML CRLH TLs) and demonstrates two types of super-compact ultra-wideband (UWB) band pass filters configured by LTCC-based ML CRLH TL architecture. UWB response (2.7-10.6 GHz in simulation and 2.4-10.6 GHz in experiment) is realized with extremely small overall dimensions of 1.5 × 1.5 × 0.95 mm3.
{"title":"Development of LTCC-based super-compact multi-layered CRLH transmission lines and broadband applications","authors":"Y. Horii","doi":"10.1109/APEMC.2012.6237979","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237979","url":null,"abstract":"This paper introduces research history of multi-layered composite right/left-handed transmission lines (ML CRLH TLs) and demonstrates two types of super-compact ultra-wideband (UWB) band pass filters configured by LTCC-based ML CRLH TL architecture. UWB response (2.7-10.6 GHz in simulation and 2.4-10.6 GHz in experiment) is realized with extremely small overall dimensions of 1.5 × 1.5 × 0.95 mm3.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":" 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120937272","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237948
R. Chang, K. See, Weishan Soh, Yew-Huat Ong, W. Huang
Today's digital data lines are clocking at very high speed, in excess of 100MHz with rise time in the sub-nano second range. The effects of EMI radiation even from short traces are becoming significant and cannot be ignored. The use of resistive termination versus the EMI filter has long been a compromise in terms of cost and necessity. EMI compliance is now becoming a major design challenge for product development rather than a mere good-to-have specification of low emission. This paper carries out a comprehensive study on filter selection, application, impact on receiver waveform signal integrity and far-field emission suppression using a full-wave electromagnetic simulator (CST Microwave Studio). This study will provide high-speed digital designers an in-depth assessment of the use of EMI filter for radiation suppression in high-speed digital layout.
{"title":"Impacts of EMI filter on high speed interconnects for digital circuits design","authors":"R. Chang, K. See, Weishan Soh, Yew-Huat Ong, W. Huang","doi":"10.1109/APEMC.2012.6237948","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237948","url":null,"abstract":"Today's digital data lines are clocking at very high speed, in excess of 100MHz with rise time in the sub-nano second range. The effects of EMI radiation even from short traces are becoming significant and cannot be ignored. The use of resistive termination versus the EMI filter has long been a compromise in terms of cost and necessity. EMI compliance is now becoming a major design challenge for product development rather than a mere good-to-have specification of low emission. This paper carries out a comprehensive study on filter selection, application, impact on receiver waveform signal integrity and far-field emission suppression using a full-wave electromagnetic simulator (CST Microwave Studio). This study will provide high-speed digital designers an in-depth assessment of the use of EMI filter for radiation suppression in high-speed digital layout.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126904859","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237903
Oussama Alilou, V. Fontaine, C. Marot
Electronic boards will become higher density of integration with lower supply voltages. Internal integrated Circuits have more and more gates on silicon and Printed circuits Boards use many high density technologies. That size reduction integration with nearby signals positions promotes internal crosstalk, sizes reduction of die geometries increases unwanted current in parasitic structure as isolation capacitances. Consequently, the immunity of electronic boards is becoming more and more critical and the use of models and simulation tools is hardly required to optimize during the design phases the susceptibility behaviour and also to predict the immunity strength to conducted disturbances both at the IC and the application level. This paper introduces in section I an overview of the IEC projects for Integrated Circuit modelling. An immunity model for an electronic board is described in section II. Example model of driver bus is presented in a part III. Simulation results of a immunity test with that driver immunity model is presented in a part IV.
{"title":"Immunity modelling of electronics board","authors":"Oussama Alilou, V. Fontaine, C. Marot","doi":"10.1109/APEMC.2012.6237903","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237903","url":null,"abstract":"Electronic boards will become higher density of integration with lower supply voltages. Internal integrated Circuits have more and more gates on silicon and Printed circuits Boards use many high density technologies. That size reduction integration with nearby signals positions promotes internal crosstalk, sizes reduction of die geometries increases unwanted current in parasitic structure as isolation capacitances. Consequently, the immunity of electronic boards is becoming more and more critical and the use of models and simulation tools is hardly required to optimize during the design phases the susceptibility behaviour and also to predict the immunity strength to conducted disturbances both at the IC and the application level. This paper introduces in section I an overview of the IEC projects for Integrated Circuit modelling. An immunity model for an electronic board is described in section II. Example model of driver bus is presented in a part III. Simulation results of a immunity test with that driver immunity model is presented in a part IV.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127170061","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237958
B. V. Ha, M. Maglio, R. Zich
The application of a wireless energy transfer system to a rotating shaft is analyzed in this paper. Energy transfer without contacts is critical in a large number of applications. The use of slip ring contacts between the power feeder and the rotating system can bring a lot of drawbacks and can damage the entire structure[1]. The use of a contactless energy transfer system could overcome all these drawbacks in particular where the maintenance time is very expensive and the access to the system parts could be hard to do.
{"title":"Contactless energy transfer in adverse environment using rectennas","authors":"B. V. Ha, M. Maglio, R. Zich","doi":"10.1109/APEMC.2012.6237958","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237958","url":null,"abstract":"The application of a wireless energy transfer system to a rotating shaft is analyzed in this paper. Energy transfer without contacts is critical in a large number of applications. The use of slip ring contacts between the power feeder and the rotating system can bring a lot of drawbacks and can damage the entire structure[1]. The use of a contactless energy transfer system could overcome all these drawbacks in particular where the maintenance time is very expensive and the access to the system parts could be hard to do.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126015077","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237868
T. Kaufmann, C. Fumeaux
Meshless methods are a new type of numerical schemes in computational electromagnetics, combining the advantages of conformal unstructured modeling with the flexibility of a node distribution without an explicit mesh topology. A scattered field formulation of the meshless Radial Point Interpolation Method (RPIM) is introduced for efficient simulation of metallic structures. Scattering problems generally result in spherically radiated wavefronts, hence truncating the computational domain with locally radial perfectly matched layers (PML) appears more effective than with classical uniaxial PML. Therefore, such problems can be modelled using less memory and shorter computation times with spherical or cylindrical PML. The scattered field RPIM formulation with radial PML is verified in a classical scattering problem from a perfectly conducting cylinder. A comparison with the analytical Mie solution shows fast convergence rates which are indicative of low reflections from the PML boundary. A convergence analysis and a study on the PML thickness demonstrates how to extend the limits of the PML formulation.
{"title":"A scattered field formulation of the time-domain Radial Point Interpolation Method using radial perfectly matched layers","authors":"T. Kaufmann, C. Fumeaux","doi":"10.1109/APEMC.2012.6237868","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237868","url":null,"abstract":"Meshless methods are a new type of numerical schemes in computational electromagnetics, combining the advantages of conformal unstructured modeling with the flexibility of a node distribution without an explicit mesh topology. A scattered field formulation of the meshless Radial Point Interpolation Method (RPIM) is introduced for efficient simulation of metallic structures. Scattering problems generally result in spherically radiated wavefronts, hence truncating the computational domain with locally radial perfectly matched layers (PML) appears more effective than with classical uniaxial PML. Therefore, such problems can be modelled using less memory and shorter computation times with spherical or cylindrical PML. The scattered field RPIM formulation with radial PML is verified in a classical scattering problem from a perfectly conducting cylinder. A comparison with the analytical Mie solution shows fast convergence rates which are indicative of low reflections from the PML boundary. A convergence analysis and a study on the PML thickness demonstrates how to extend the limits of the PML formulation.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125521432","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6238014
S. Uddin, H. Shareef, A. Mohamed, M. A. Hannan
Light Emitting Diodes (LEDs) are versatile, energy efficient when compared to the conventional light sources. LEDs represent a transformational change in how light is produced. However, there are significant differences between conventional lighting sources and LEDs in terms of voltage and current operating requirements which may affect the power quality (PQ) of AC mains supplying the LED bulbs. Therefore, this paper investigates harmonic generations from LED bulbs available in the market. It is done by conducting laboratory tests on various LED lamps and tapping the load current behaviour under different conditions. Then frequency domain analysis is performed to investigate the generated harmonics. Harmonic levels of different wattage, various branded LED bulbs are experimentally evaluated and compared. The results show that most of the LED lamps produce high level of harmonics with reference to the IEC 61000-3-2 standard.
{"title":"An analysis of harmonics from LED lamps","authors":"S. Uddin, H. Shareef, A. Mohamed, M. A. Hannan","doi":"10.1109/APEMC.2012.6238014","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6238014","url":null,"abstract":"Light Emitting Diodes (LEDs) are versatile, energy efficient when compared to the conventional light sources. LEDs represent a transformational change in how light is produced. However, there are significant differences between conventional lighting sources and LEDs in terms of voltage and current operating requirements which may affect the power quality (PQ) of AC mains supplying the LED bulbs. Therefore, this paper investigates harmonic generations from LED bulbs available in the market. It is done by conducting laboratory tests on various LED lamps and tapping the load current behaviour under different conditions. Then frequency domain analysis is performed to investigate the generated harmonics. Harmonic levels of different wattage, various branded LED bulbs are experimentally evaluated and compared. The results show that most of the LED lamps produce high level of harmonics with reference to the IEC 61000-3-2 standard.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127706719","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237988
I. Ahmed, E. Li
We present a review of our work on time domain simulation of devices from nano-electronics to nano-photonics. Different equations and models are incorporated into Maxwell equations. Schrödinger equation is incorporated into Maxwell equations to model nano-electronics and nano-plasmonics devices, Lorentz-Drude (LD) dispersive model to simulate passive plasmonic devices, whereas a solid state model consisting of Pauli Exclusion principle, state filling effect and dynamic Fermi-Dirac Thermalization is incorporated to model active nano-photonics devices. LD and solid state models are hybridized for the simulation of active plasmonics devices. Graphics processing unit (GPU) is used to enhance the simulation speed, and as an example one of the models is implemented on it.
{"title":"Time domain modeling: From nano-electronics to nano-photonics","authors":"I. Ahmed, E. Li","doi":"10.1109/APEMC.2012.6237988","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237988","url":null,"abstract":"We present a review of our work on time domain simulation of devices from nano-electronics to nano-photonics. Different equations and models are incorporated into Maxwell equations. Schrödinger equation is incorporated into Maxwell equations to model nano-electronics and nano-plasmonics devices, Lorentz-Drude (LD) dispersive model to simulate passive plasmonic devices, whereas a solid state model consisting of Pauli Exclusion principle, state filling effect and dynamic Fermi-Dirac Thermalization is incorporated to model active nano-photonics devices. LD and solid state models are hybridized for the simulation of active plasmonics devices. Graphics processing unit (GPU) is used to enhance the simulation speed, and as an example one of the models is implemented on it.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128976588","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 : 2012-05-21DOI: 10.1109/APEMC.2012.6237803
E. Amador, C. Lemoine, Philippe Besnier
In this article, we propose an alternative approach for measuring the susceptibility level of an equipment under test in a reverberation chamber. Instead of using a statistical estimation of the maximum, our estimation is based on an estimation of the probability of failure of the equipment under test. We show through Monte Carlo simulations that the probability of failure of an equipment under test allows to predict with a good accuracy its susceptibility level. An experimental validation with a simple equipment under test shows that the susceptibility levels measured in a reverberation chamber are consistent with measurements performed in a GTEM cell.
{"title":"A probabilistic approach to susceptibility measurement in a reverberation chamber","authors":"E. Amador, C. Lemoine, Philippe Besnier","doi":"10.1109/APEMC.2012.6237803","DOIUrl":"https://doi.org/10.1109/APEMC.2012.6237803","url":null,"abstract":"In this article, we propose an alternative approach for measuring the susceptibility level of an equipment under test in a reverberation chamber. Instead of using a statistical estimation of the maximum, our estimation is based on an estimation of the probability of failure of the equipment under test. We show through Monte Carlo simulations that the probability of failure of an equipment under test allows to predict with a good accuracy its susceptibility level. An experimental validation with a simple equipment under test shows that the susceptibility levels measured in a reverberation chamber are consistent with measurements performed in a GTEM cell.","PeriodicalId":300639,"journal":{"name":"2012 Asia-Pacific Symposium on Electromagnetic Compatibility","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130506540","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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