Pub Date : 2018-05-06DOI: 10.1109/ICMMT.2018.8563875
H. Tu, M. Serhir, P. Ran, D. Lesselier
Micro-structured systems of wire antennas the inter-element distance of which being much smaller than the electromagnetic wavelengths either in transmission or reception are studied by the authors from 3-D computational modeling to experiments in anechoic chambers on down-scaled prototypes. Recent results with focus on potential super-localization of a peculiar radiating element in the aforementioned micro-structure will be considered here while further challenges ahead, notably in terms of questions of super-resolved imaging in likewise microstructured structures will be sketched.
{"title":"On the Modeling and Diagnosis of a Micro-Structured Wire Antenna System","authors":"H. Tu, M. Serhir, P. Ran, D. Lesselier","doi":"10.1109/ICMMT.2018.8563875","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563875","url":null,"abstract":"Micro-structured systems of wire antennas the inter-element distance of which being much smaller than the electromagnetic wavelengths either in transmission or reception are studied by the authors from 3-D computational modeling to experiments in anechoic chambers on down-scaled prototypes. Recent results with focus on potential super-localization of a peculiar radiating element in the aforementioned micro-structure will be considered here while further challenges ahead, notably in terms of questions of super-resolved imaging in likewise microstructured structures will be sketched.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127862107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-06DOI: 10.1109/ICMMT.2018.8563966
M. Serhir, M. Lambert, D. Lesselier, Xiuzhu Ye
Electromagnetic probing of natural and/or manmade structures that are buried in subsoil or hidden within walls or other known obstacles certainly remains a challenging task yet it is in need for a range of applications that can go from most traditional civil engineering applications to novel interrogations, like on the estimation of root systems of trees and biomass evaluation, as one among many examples. This multi-authored multi-laboratory contribution is based on existing as well as just being started works on the above issue endeavored in them. It will go in some depth into examples being drawn from this research, with peculiar emphasis on two joint issues, computational imaging (in a weak scattering as well as a fully non-linear realm) and optimal antenna design. Then, it will attempt to point out challenges ahead, from modeling to experiments in controlled enough situations.
{"title":"On the Electromagnetic Probing of Man-Made and Natural Buried Structures","authors":"M. Serhir, M. Lambert, D. Lesselier, Xiuzhu Ye","doi":"10.1109/ICMMT.2018.8563966","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563966","url":null,"abstract":"Electromagnetic probing of natural and/or manmade structures that are buried in subsoil or hidden within walls or other known obstacles certainly remains a challenging task yet it is in need for a range of applications that can go from most traditional civil engineering applications to novel interrogations, like on the estimation of root systems of trees and biomass evaluation, as one among many examples. This multi-authored multi-laboratory contribution is based on existing as well as just being started works on the above issue endeavored in them. It will go in some depth into examples being drawn from this research, with peculiar emphasis on two joint issues, computational imaging (in a weak scattering as well as a fully non-linear realm) and optimal antenna design. Then, it will attempt to point out challenges ahead, from modeling to experiments in controlled enough situations.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123027169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563611
Li Yang, Lei Zhu, Wai‐Wa Choi, K. Tam
In this paper, a novel microstrip-to-microstrip vertical transition designed with slotline stepped-impedance resonator (SIR) is presented. By substituting the proposed slotline SIR for the conventional uniform slotline resonator, a wideband filtering response with extended upper stopband for our proposed vertical transition can be realized. To verify our design expectation, a two-layered wideband vertical transition operating at 3 GHz is simulated, fabricated and experimentally tested. Good agreement between simulation and measurement results is achieved. The proposed transition with insertion loss better than 2-dB is measured from 1.64 GHz to 4.02 GHz, meanwhile an extended upper stopband from 4.78 GHz to 16.75 GHz with suppression higher than 12.1 dB is obtained.
{"title":"Novel Microstrip-To-Microstrip Vertical Transition Designed with Slotline Stepped-Impedance Resonator","authors":"Li Yang, Lei Zhu, Wai‐Wa Choi, K. Tam","doi":"10.1109/ICMMT.2018.8563611","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563611","url":null,"abstract":"In this paper, a novel microstrip-to-microstrip vertical transition designed with slotline stepped-impedance resonator (SIR) is presented. By substituting the proposed slotline SIR for the conventional uniform slotline resonator, a wideband filtering response with extended upper stopband for our proposed vertical transition can be realized. To verify our design expectation, a two-layered wideband vertical transition operating at 3 GHz is simulated, fabricated and experimentally tested. Good agreement between simulation and measurement results is achieved. The proposed transition with insertion loss better than 2-dB is measured from 1.64 GHz to 4.02 GHz, meanwhile an extended upper stopband from 4.78 GHz to 16.75 GHz with suppression higher than 12.1 dB is obtained.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123095876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563549
Chen Zhang, L. Deng, Jianfeng Zhu, W. Hong, Ling Wang, Shu Fang Li
In this paper, a graphene reflective metasurface for generating spin-controlled vortex waves is proposed in the terahertz domain. By patterning the graphene cells into the phase distribution of corresponding topological modes, the proposed graphene metasurface is capable of generating a vortex beam carrying orbital angular momentum (OAM). More importantly, taking advantages of the Pancharatnam-Berry (PB) phase method, a spin-controlled OAM beam can be achieved in the reflective orientation. Compared with line-polarized OAM, the proposed spin-controlled beams can provide one more degree of freedom for THz wireless communication. Numerical simulations results demonstrate the spin vortex waves with various topological modes can be flexibly achieved by this graphene metasurface, which paves a way to generate spin OAM vortex waves for communication systems in terahertz.
{"title":"Graphene Reflective Metasurface for Generating Spin-Controlled Vortex Waves in the Terahertz Regime","authors":"Chen Zhang, L. Deng, Jianfeng Zhu, W. Hong, Ling Wang, Shu Fang Li","doi":"10.1109/ICMMT.2018.8563549","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563549","url":null,"abstract":"In this paper, a graphene reflective metasurface for generating spin-controlled vortex waves is proposed in the terahertz domain. By patterning the graphene cells into the phase distribution of corresponding topological modes, the proposed graphene metasurface is capable of generating a vortex beam carrying orbital angular momentum (OAM). More importantly, taking advantages of the Pancharatnam-Berry (PB) phase method, a spin-controlled OAM beam can be achieved in the reflective orientation. Compared with line-polarized OAM, the proposed spin-controlled beams can provide one more degree of freedom for THz wireless communication. Numerical simulations results demonstrate the spin vortex waves with various topological modes can be flexibly achieved by this graphene metasurface, which paves a way to generate spin OAM vortex waves for communication systems in terahertz.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116862294","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}
The transmitarray plays an important role in high gain antennas with beam steering abilities. However, multi-beam transmitarray suffers high scan loss when identical radiating aperture is shared among multiple feeding ports, i.e., lower gain is achieved with larger beam steering angle away from the normal direction to the transmitarray. For this reason, the sliding aperture technique is adopted and discussed in this paper. Each feeding port illuminates a segment of the overall aperture, and each segment is with nearly perfect transmitting phase distribution according to its feeding port for low scan loss, i.e. stable gain. Then, a linear multi-beam transmitarray based on the sliding aperture technique is numerical studied for the first time, to the best of the authors' knowledge. The numerical results show that the antenna can generate six beams covering $pm 32.5^{text{o}}$ azimuthal area with gain variation less than 1 dB, and all ports have good matching and high isolation in operating band.
{"title":"Sliding the Radiating Aperture of Multi-Beam Transmitarray with Low Scan Loss","authors":"Yuefeng Hou, Yue Li, Zhijun Zhang, Changjiang Deng, Zhenghe Feng","doi":"10.1109/ICMMT.2018.8563837","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563837","url":null,"abstract":"The transmitarray plays an important role in high gain antennas with beam steering abilities. However, multi-beam transmitarray suffers high scan loss when identical radiating aperture is shared among multiple feeding ports, i.e., lower gain is achieved with larger beam steering angle away from the normal direction to the transmitarray. For this reason, the sliding aperture technique is adopted and discussed in this paper. Each feeding port illuminates a segment of the overall aperture, and each segment is with nearly perfect transmitting phase distribution according to its feeding port for low scan loss, i.e. stable gain. Then, a linear multi-beam transmitarray based on the sliding aperture technique is numerical studied for the first time, to the best of the authors' knowledge. The numerical results show that the antenna can generate six beams covering $pm 32.5^{text{o}}$ azimuthal area with gain variation less than 1 dB, and all ports have good matching and high isolation in operating band.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116948102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563821
Fan Zhang, Jin Li, Peng Zhao, Guanlong Huang, Jun Xu
This paper presents a fourth-order wideband microstrip elliptic bandpass filter that is capable of flexibly reconfiguring its passband bandwidth (BW) with highly reduced number of tuning elements. The filter's BW tunability is varactor-enabled and is realized by tuning the even-mode resonant frequency of the utilized stub-loaded dual-mode resonators. Either the lower or the higher edge of the filter's passband can be tuned continuously and independently with the use of only two varactors. The demonstrated filter exhibits an elliptic-transfer-function response with tuning ranges of 250 and 520 MHz for the lower and higher passband edges, respectively, and a BW tuning range of 500–900 MHz at a center frequency of 2.4 GHz.
{"title":"A Wideband Microstrip Elliptic Bandpass Filter with Flexibly Tunable Bandwidth","authors":"Fan Zhang, Jin Li, Peng Zhao, Guanlong Huang, Jun Xu","doi":"10.1109/ICMMT.2018.8563821","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563821","url":null,"abstract":"This paper presents a fourth-order wideband microstrip elliptic bandpass filter that is capable of flexibly reconfiguring its passband bandwidth (BW) with highly reduced number of tuning elements. The filter's BW tunability is varactor-enabled and is realized by tuning the even-mode resonant frequency of the utilized stub-loaded dual-mode resonators. Either the lower or the higher edge of the filter's passband can be tuned continuously and independently with the use of only two varactors. The demonstrated filter exhibits an elliptic-transfer-function response with tuning ranges of 250 and 520 MHz for the lower and higher passband edges, respectively, and a BW tuning range of 500–900 MHz at a center frequency of 2.4 GHz.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117264282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563307
Li-Yan Chen, Jingsong Hong
A novel log-periodic multiple-input-multiple-output (MIMO) antenna array for ultra-wideband (UWB) system in a size of $195times 195times 45mathrm{mm3}$ is proposed. There are eight antennas in this array: four horizontal antennas are placed orthogonally on a FR4 substrate and other four vertical antennas insert into corresponding slot etching on the diagonal of FR4 substrate to obtain beam switching and dual-polarized characteristics. In addition, all eight antennas share a common square ground on the back of substrate and feed by micro-strip line. Results show that the designed MIMO antenna exhibits a good impedance match with $mathrm{s}_{11} < -10mathrm{dB}$, high coupling isolation better than 40 dB, average peak gain of 6.5 dBi and envelope correlation coefficient $mathrm{(ECC) } < 0.005$ cover the whole UWB range (3.1-10.6 GHz).
{"title":"A Novel Log-Periodic MIMO Antenna for UWB System","authors":"Li-Yan Chen, Jingsong Hong","doi":"10.1109/ICMMT.2018.8563307","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563307","url":null,"abstract":"A novel log-periodic multiple-input-multiple-output (MIMO) antenna array for ultra-wideband (UWB) system in a size of $195times 195times 45mathrm{mm3}$ is proposed. There are eight antennas in this array: four horizontal antennas are placed orthogonally on a FR4 substrate and other four vertical antennas insert into corresponding slot etching on the diagonal of FR4 substrate to obtain beam switching and dual-polarized characteristics. In addition, all eight antennas share a common square ground on the back of substrate and feed by micro-strip line. Results show that the designed MIMO antenna exhibits a good impedance match with $mathrm{s}_{11} < -10mathrm{dB}$, high coupling isolation better than 40 dB, average peak gain of 6.5 dBi and envelope correlation coefficient $mathrm{(ECC) } < 0.005$ cover the whole UWB range (3.1-10.6 GHz).","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"82 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120973972","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}
A novel $100mathrm{MHz}sim 60mathrm{GHz}$ wideband isotropic electric field (E-field) probe, capable of accurately measuring the strength of the electromagnetic radiation, is presented in this paper. The E-field probe mainly consists of tapered resistive dipole and a low-barrier, beam-lead Schottky detector diode. The E-field probe has the ability of measuring $0.7mathrm{V}/mathrm{m}sim 400mathrm{V}/mathrm{m}$. The frequency response of the probe is within $pm 3mathrm{dB}(300mathrm{MHz}sim 40mathrm{GHz})$. The isotropic response with respect to angle, guaranteed by spatial mutually orthogonal dipole configuration, is within $pm 1mathrm{dB}$.
{"title":"Design of a Nove1 100MHz-60GHz Isotropic Electric-Field Probe","authors":"Jiawen Sun, Qiantao Cao, Yong Wang, Jinxian Liu, Wanshun Jiang","doi":"10.1109/ICMMT.2018.8563489","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563489","url":null,"abstract":"A novel $100mathrm{MHz}sim 60mathrm{GHz}$ wideband isotropic electric field (E-field) probe, capable of accurately measuring the strength of the electromagnetic radiation, is presented in this paper. The E-field probe mainly consists of tapered resistive dipole and a low-barrier, beam-lead Schottky detector diode. The E-field probe has the ability of measuring $0.7mathrm{V}/mathrm{m}sim 400mathrm{V}/mathrm{m}$. The frequency response of the probe is within $pm 3mathrm{dB}(300mathrm{MHz}sim 40mathrm{GHz})$. The isotropic response with respect to angle, guaranteed by spatial mutually orthogonal dipole configuration, is within $pm 1mathrm{dB}$.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"3 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120997671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563789
Yefang Wang, Xiaofei Xu
An extremely compact metamaterial element is proposed with multilayer meander line (MML) resonator inclusions. The MML is featured with multiple single-planar meander line (SML) structures which are connected by via. The effective inductance in the new MML structure is thus multiplied leading to a reduced resonance frequency. A proof MML element is numerically demonstrated with period of 8mm. Very strong electric responses have been observed indicating the MML element is essentially a kind of electrically resonating structure. The proof MML element resonances at 237MHz in VHF band. The electrical period size is 1/158λ0 which is in deep subwavelength. By making the meander line thinner or incorporating more SML layers, the effective inductance can be further enhanced and the structure is more compact which is promising for radio frequency metamaterial designs in future.
{"title":"Design of a Metamaterial Element in Deep Subwavelength Composed of Multilayer Meander Line (MML) Resonator Structures","authors":"Yefang Wang, Xiaofei Xu","doi":"10.1109/ICMMT.2018.8563789","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563789","url":null,"abstract":"An extremely compact metamaterial element is proposed with multilayer meander line (MML) resonator inclusions. The MML is featured with multiple single-planar meander line (SML) structures which are connected by via. The effective inductance in the new MML structure is thus multiplied leading to a reduced resonance frequency. A proof MML element is numerically demonstrated with period of 8mm. Very strong electric responses have been observed indicating the MML element is essentially a kind of electrically resonating structure. The proof MML element resonances at 237MHz in VHF band. The electrical period size is 1/158λ0 which is in deep subwavelength. By making the meander line thinner or incorporating more SML layers, the effective inductance can be further enhanced and the structure is more compact which is promising for radio frequency metamaterial designs in future.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124732880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ICMMT.2018.8563824
Xin Chen, L. Ye, Kehan Sui, Q. Liu
A graphene-based tunable THz metamaterial absorber is presented in this paper. The proposed absorber is a periodical structure with the unit cell composed of four square gold patches on single-layered graphene, which are placed on a dielectric spacer supported by a gold bottom layer. Simulation results indicate that the absorption frequency can be tuned by varying the chemical potential of graphene through controlling of the electrostatic gating or the geometry size of the gold patch. By introducing more gold patches with different size into the unit cell, we can obviously extend the absorption bandwidth to achieve a broadband absorber.
{"title":"A Graphene-Based Tunable THz Metamaterial Absorber","authors":"Xin Chen, L. Ye, Kehan Sui, Q. Liu","doi":"10.1109/ICMMT.2018.8563824","DOIUrl":"https://doi.org/10.1109/ICMMT.2018.8563824","url":null,"abstract":"A graphene-based tunable THz metamaterial absorber is presented in this paper. The proposed absorber is a periodical structure with the unit cell composed of four square gold patches on single-layered graphene, which are placed on a dielectric spacer supported by a gold bottom layer. Simulation results indicate that the absorption frequency can be tuned by varying the chemical potential of graphene through controlling of the electrostatic gating or the geometry size of the gold patch. By introducing more gold patches with different size into the unit cell, we can obviously extend the absorption bandwidth to achieve a broadband absorber.","PeriodicalId":190601,"journal":{"name":"2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124943828","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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