Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7167049
Jiejun Zhang, O. Coutinho, J. Yao
We propose and experimentally demonstrate a photonic approach to generating a linearly chirped microwave waveform with a large time bandwidth product (TBWP) based on spectral shaping and wavelength-to-time (SS-WTT) mapping. The spectral shaping is performed using a Fabry-Perot interferometer (FPI) consisting of two linearly chirped fiber Bragg gratings (LCFBG) with complementary dispersion to produce a spectral response with a linearly increasing or decreasing free spectral range. The wavelength-to-time mapping is performed using a dispersive loop incorporating a third LCFBG. Thanks to the multiple-time use of the third LCFBG, an extremely large equivalent dispersion can be achieved, which leads to the generation of a linearly chirped microwave waveform with a long temporal duration. The proposed technique is validated by an experiment. Two linearly chirped microwave waveforms with a TBWP of 225 and a temporal duration of 25 and 45 ns are generated.
{"title":"Photonic generation of a linearly chirped microwave waveform with long temporal duration using a dispersive loop","authors":"Jiejun Zhang, O. Coutinho, J. Yao","doi":"10.1109/MWSYM.2015.7167049","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7167049","url":null,"abstract":"We propose and experimentally demonstrate a photonic approach to generating a linearly chirped microwave waveform with a large time bandwidth product (TBWP) based on spectral shaping and wavelength-to-time (SS-WTT) mapping. The spectral shaping is performed using a Fabry-Perot interferometer (FPI) consisting of two linearly chirped fiber Bragg gratings (LCFBG) with complementary dispersion to produce a spectral response with a linearly increasing or decreasing free spectral range. The wavelength-to-time mapping is performed using a dispersive loop incorporating a third LCFBG. Thanks to the multiple-time use of the third LCFBG, an extremely large equivalent dispersion can be achieved, which leads to the generation of a linearly chirped microwave waveform with a long temporal duration. The proposed technique is validated by an experiment. Two linearly chirped microwave waveforms with a TBWP of 225 and a temporal duration of 25 and 45 ns are generated.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"14 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84481445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7167123
Haiyu Huang, Pai-Yen Chen, Cheng-Hsien Hung, R. Gharpurey, D. Akinwande
This paper presents a passive wireless sensing paradigm based on the harmonic transponder comprising an antenna covered with a metamaterial-inspired helical structure, which is sensitive to the liquid-level within. An interrogator transmits frequency hopped UHF RFID signals to the transponder, and a sniffer detects the harmonic signal from the transponder and decodes its RSSI array. A μL-resolution absolute accuracy sensing is demonstrated to support the low-cost ubiquitous liquid monitoring.
{"title":"Frequency hopped wireless passive sensing system with harmonic transponder antenna sensor","authors":"Haiyu Huang, Pai-Yen Chen, Cheng-Hsien Hung, R. Gharpurey, D. Akinwande","doi":"10.1109/MWSYM.2015.7167123","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7167123","url":null,"abstract":"This paper presents a passive wireless sensing paradigm based on the harmonic transponder comprising an antenna covered with a metamaterial-inspired helical structure, which is sensitive to the liquid-level within. An interrogator transmits frequency hopped UHF RFID signals to the transponder, and a sniffer detects the harmonic signal from the transponder and decodes its RSSI array. A μL-resolution absolute accuracy sensing is demonstrated to support the low-cost ubiquitous liquid monitoring.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"59 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84899561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7166722
Y. Ning, X. Ma, C. Multari, X. Luo, V. Gholizadeh, C. Palego, X. Cheng, J. Hwang
Based on a homemade probe station on top of an inverted microscope for simultaneous microwave measurement and visual validation, broadband detection of live Jurkat cells was successfully extended from 2-3.5 GHz to 0.5-20 GHz with comparable sensitivity and reproducibility. With a carefully optimized coplanar waveguide, closely spaced microwave probes, and frequent calibrations, reference planes were established next to the microfluidic channel, which resulted in smooth and well-behaved scattering parameters without spurious resonances. From the measured scattering parameters, the extracted cytoplasm resistance of 190 kΩ was consistent with the previously reported value but validated over a much wider bandwidth.
{"title":"Improved broadband electrical detection of individual biological cells","authors":"Y. Ning, X. Ma, C. Multari, X. Luo, V. Gholizadeh, C. Palego, X. Cheng, J. Hwang","doi":"10.1109/MWSYM.2015.7166722","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7166722","url":null,"abstract":"Based on a homemade probe station on top of an inverted microscope for simultaneous microwave measurement and visual validation, broadband detection of live Jurkat cells was successfully extended from 2-3.5 GHz to 0.5-20 GHz with comparable sensitivity and reproducibility. With a carefully optimized coplanar waveguide, closely spaced microwave probes, and frequent calibrations, reference planes were established next to the microfluidic channel, which resulted in smooth and well-behaved scattering parameters without spurious resonances. From the measured scattering parameters, the extracted cytoplasm resistance of 190 kΩ was consistent with the previously reported value but validated over a much wider bandwidth.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"20 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85215937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7167139
Rui Zhu, Yonghoon Song, Y. Wang
The linearity of a RF transmitter must often be traded off with its efficiency. High efficiency operation often requires the transmitter to operate in a deep saturation or a switching-mode state. The non-linear distortion components of the signal such as the Third-Order Intermodulation (IM3) terms are the primary causes of the increased Error Vector Magnitude (EVM) and Adjacent Channel Power Ratio (ACPR) level and poorer transmitted signal integrity. In this paper, we proposed a digitally enhanced technique to suppress the intermodulation terms in the output of the power amplifiers (PAs), which is called Channelized Active Noise Elimination (CANE) technique. CANE utilizes the combining of multiple PA channels driven with digitally delayed baseband signal to form an active FIR filter. The rejection band of the FIR filter can be placed where the IM3 appears to realize intermodulation suppression. Similar idea can also be extended to a multi-carrier RF system, with multiple software defined filters formed for different carriers on the same set of hardware. Measurements have shown about 17dB IM3 suppression for a single carrier and 10dB IM3 suppression for a two-carrier signal.
{"title":"Suppressing transmitter intermodulations with Channelized Active Noise Elimination (CANE)","authors":"Rui Zhu, Yonghoon Song, Y. Wang","doi":"10.1109/MWSYM.2015.7167139","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7167139","url":null,"abstract":"The linearity of a RF transmitter must often be traded off with its efficiency. High efficiency operation often requires the transmitter to operate in a deep saturation or a switching-mode state. The non-linear distortion components of the signal such as the Third-Order Intermodulation (IM3) terms are the primary causes of the increased Error Vector Magnitude (EVM) and Adjacent Channel Power Ratio (ACPR) level and poorer transmitted signal integrity. In this paper, we proposed a digitally enhanced technique to suppress the intermodulation terms in the output of the power amplifiers (PAs), which is called Channelized Active Noise Elimination (CANE) technique. CANE utilizes the combining of multiple PA channels driven with digitally delayed baseband signal to form an active FIR filter. The rejection band of the FIR filter can be placed where the IM3 appears to realize intermodulation suppression. Similar idea can also be extended to a multi-carrier RF system, with multiple software defined filters formed for different carriers on the same set of hardware. Measurements have shown about 17dB IM3 suppression for a single carrier and 10dB IM3 suppression for a two-carrier signal.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81965570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7167144
A. Baryshev, R. Hesper, W. Wild
The Atacama Large Millimeter Array (ALMA) is a collaboration between Europe, North America, and Japan to build an aperture synthesis telescope with more than 50 12-m antennas at 5000 m altitude in Chile. In its full configuration, ALMA will observe in 10 bands between 30 and 950 GHz, and will provide astronomers with unprecedented sensitivity and spatial resolution at millimetre and sub-millimetre wavelengths. Band 9, covering 602-720 GHz, is the highest frequency band in the baseline ALMA project, and will thus offer the telescope's highest spatial resolutions. This paper describes the design of the Band 9 receiver cartridges for the Atacama Large Millimeter Array (ALMA). These are field-replaceable heterodyne front-ends offering high sensitivities, 602-720 GHz frequency coverage, 4-12 GHz IF bandwidths, and high quasioptical efficiencies. We specifically focus on the SIS mixer microwave design calculations that are based on J.R. Tucker theory.
{"title":"ALMA Band 9 receiver design and performance","authors":"A. Baryshev, R. Hesper, W. Wild","doi":"10.1109/MWSYM.2015.7167144","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7167144","url":null,"abstract":"The Atacama Large Millimeter Array (ALMA) is a collaboration between Europe, North America, and Japan to build an aperture synthesis telescope with more than 50 12-m antennas at 5000 m altitude in Chile. In its full configuration, ALMA will observe in 10 bands between 30 and 950 GHz, and will provide astronomers with unprecedented sensitivity and spatial resolution at millimetre and sub-millimetre wavelengths. Band 9, covering 602-720 GHz, is the highest frequency band in the baseline ALMA project, and will thus offer the telescope's highest spatial resolutions. This paper describes the design of the Band 9 receiver cartridges for the Atacama Large Millimeter Array (ALMA). These are field-replaceable heterodyne front-ends offering high sensitivities, 602-720 GHz frequency coverage, 4-12 GHz IF bandwidths, and high quasioptical efficiencies. We specifically focus on the SIS mixer microwave design calculations that are based on J.R. Tucker theory.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"45 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79518880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7167130
L. Pierantoni, D. Mencarelli, A. Sindona, M. Gravina, M. Pisarra, C. V. Gomez, S. Bellucci
We report on an ab initio technique for modeling the electromagnetic response of graphene in the THz range. Quantum mechanical calculations are performed using linear response density functional theory, and compared with a semi-phenomenological model derived from the Kubo formula. We present a novel concept of dispersive conductivity, which goes beyond the Kubo-Drude model and results in a self-consistent constitutive relation for the analysis of plasmon propagation in complex nanosystems. The rigorous characterization of the constitutive relation may be inserted in electromagnetic full-wave solvers, providing a new paradigm for nanoelectronic computations at THz frequencies.
{"title":"Innovative full wave modeling of plasmon propagation in graphene by dielectric permittivity simulations based on density functional theory","authors":"L. Pierantoni, D. Mencarelli, A. Sindona, M. Gravina, M. Pisarra, C. V. Gomez, S. Bellucci","doi":"10.1109/MWSYM.2015.7167130","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7167130","url":null,"abstract":"We report on an ab initio technique for modeling the electromagnetic response of graphene in the THz range. Quantum mechanical calculations are performed using linear response density functional theory, and compared with a semi-phenomenological model derived from the Kubo formula. We present a novel concept of dispersive conductivity, which goes beyond the Kubo-Drude model and results in a self-consistent constitutive relation for the analysis of plasmon propagation in complex nanosystems. The rigorous characterization of the constitutive relation may be inserted in electromagnetic full-wave solvers, providing a new paradigm for nanoelectronic computations at THz frequencies.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"6 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80298272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7166867
R. Campbell
An I Q mixer topology using passive components and a single SPDT switch is described with simulations and measurements at 7 MHz and 144 MHz. A test fixture permits experiments with a variety of switch candidates. Results are presented for MOSFET switches and an SPDT switch using a hybrid coil and ring of Schottky diodes. SSB conversion loss is near 6 dB. Measured IIP3 is +16 dBm for a MOSFET switch and +6 dBm for the diodes. The Schottky version exhibits much better 2nd order performance and stability of amplitude and phase differences between I and Q ports. Results at VHF using surface mount components suggest that the Schottky diode/hybrid coil switch is a promising candidate for low power near-zero IF applications.
{"title":"HF-VHF-UHF IQ mixer with a single SPDT switch","authors":"R. Campbell","doi":"10.1109/MWSYM.2015.7166867","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7166867","url":null,"abstract":"An I Q mixer topology using passive components and a single SPDT switch is described with simulations and measurements at 7 MHz and 144 MHz. A test fixture permits experiments with a variety of switch candidates. Results are presented for MOSFET switches and an SPDT switch using a hybrid coil and ring of Schottky diodes. SSB conversion loss is near 6 dB. Measured IIP3 is +16 dBm for a MOSFET switch and +6 dBm for the diodes. The Schottky version exhibits much better 2nd order performance and stability of amplitude and phase differences between I and Q ports. Results at VHF using surface mount components suggest that the Schottky diode/hybrid coil switch is a promising candidate for low power near-zero IF applications.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"40 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80308999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7166819
Y. Kawano
We present novel THz imagers and spectrometers based on nanostructured semiconductors and graphene devices. A THz imager with sub-wavelength resolution and frequency tunable THz detector are described.
{"title":"Semiconductor and graphene devices for nanoscale terahertz imaging and spectroscopy","authors":"Y. Kawano","doi":"10.1109/MWSYM.2015.7166819","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7166819","url":null,"abstract":"We present novel THz imagers and spectrometers based on nanostructured semiconductors and graphene devices. A THz imager with sub-wavelength resolution and frequency tunable THz detector are described.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"57 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80686977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7166975
Haotian Zhu, Q. Xue, S. Pang, Jianan Hui, Xinghai Zhao
In this paper, dielectric ribbon waveguides (DRWs) are designed to work at 750-1000 GHz. In this frequency band, the Deep Reactive Ion Etching (DRIE) of high resistivity silicon fabrication process is selected to fabricate the DRW. Our experiments show that the average attenuation constant of DRW is merely 0.107dB/mm at 750-1000GHz. Good agreements between the measured and simulated results are observed.
在本文中，介质带波导(drw)被设计工作在750-1000 GHz。在该频段内，选择了高电阻率硅制造工艺的深度反应离子刻蚀(Deep Reactive Ion Etching, DRIE)来制造DRW。实验表明，在750-1000GHz范围内，DRW的平均衰减常数仅为0.107dB/mm。实验结果与模拟结果吻合较好。
{"title":"Low loss dielectric ridge waveguide based on high resistivity silicon for E11y Mode Propagation at 750–1000GHz","authors":"Haotian Zhu, Q. Xue, S. Pang, Jianan Hui, Xinghai Zhao","doi":"10.1109/MWSYM.2015.7166975","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7166975","url":null,"abstract":"In this paper, dielectric ribbon waveguides (DRWs) are designed to work at 750-1000 GHz. In this frequency band, the Deep Reactive Ion Etching (DRIE) of high resistivity silicon fabrication process is selected to fabricate the DRW. Our experiments show that the average attenuation constant of DRW is merely 0.107dB/mm at 750-1000GHz. Good agreements between the measured and simulated results are observed.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"43 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83118636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-17DOI: 10.1109/MWSYM.2015.7166841
S. Fujii, M. Sumisaka, G. Tang, Yusuke Suzuki, S. Otomo, T. Omori, K. Hashimoto
ScAlN thin films were deposited by a conventional radiofrequency (RF)-magnetron sputtering system using two Sc-Al alloy metal targets with different Sc/Al ratios. A 10 h deposition time resulted in highly c-axis-oriented ScAlN thin films with Sc concentrations of 32 at% and 22 at% on Sc0.43-Al0.57 and Sc0.32-Al0.68 targets, respectively. C-axis orientation was lost in thin films deposited on the Sc0.43-Al0.57 target after sputtering times of over 50 h. XDS analysis showed a high-Sc-content ScAlN film with an amorphous phase layer near the Si substrate surface. A seed layer of c-axis-oriented ScAIN allowed for > 50 h deposition on the Sc0.43-Al0.57 target to result in highly c-axis-oriented ScAlN films. A one-port surface acoustic wave (SAW) resonator based on the ScAlN/Si structure has a K2 value of 2.7% at 2 GHz, six times larger than for that based on the AlN/Si structure.
{"title":"Highly c-axis-oriented ScAlN thin films deposited using Sc-Al alloy target","authors":"S. Fujii, M. Sumisaka, G. Tang, Yusuke Suzuki, S. Otomo, T. Omori, K. Hashimoto","doi":"10.1109/MWSYM.2015.7166841","DOIUrl":"https://doi.org/10.1109/MWSYM.2015.7166841","url":null,"abstract":"ScAlN thin films were deposited by a conventional radiofrequency (RF)-magnetron sputtering system using two Sc-Al alloy metal targets with different Sc/Al ratios. A 10 h deposition time resulted in highly c-axis-oriented ScAlN thin films with Sc concentrations of 32 at% and 22 at% on Sc0.43-Al0.57 and Sc0.32-Al0.68 targets, respectively. C-axis orientation was lost in thin films deposited on the Sc0.43-Al0.57 target after sputtering times of over 50 h. XDS analysis showed a high-Sc-content ScAlN film with an amorphous phase layer near the Si substrate surface. A seed layer of c-axis-oriented ScAIN allowed for > 50 h deposition on the Sc0.43-Al0.57 target to result in highly c-axis-oriented ScAlN films. A one-port surface acoustic wave (SAW) resonator based on the ScAlN/Si structure has a K2 value of 2.7% at 2 GHz, six times larger than for that based on the AlN/Si structure.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"44 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83411895","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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