Pub Date : 2022-05-09DOI: 10.1109/mms55062.2022.9825557
Z. Xu, Yuan Ding, Wei Gong
This paper presents the first symbol-level modu-lation technology for ZigBee backscatter communication. The developed backscatter tag, leveraging ambient ZigBee transmissions as radio frequency (RF) carrier excitation, conveys data by translating an excitation signal into a new ZigBee signal in neighboring ZigBee channels. This avoids the strong interference from the ambient excitation signals. The key enabling technique is a symbol-level codeword translation, which exploits square waves based on the difference between the excitation and tag data. A working prototype was successfully demonstrated to validate the modulation technology, which consists of two parts: an RF front-end circuit and an FPG A-based control circuit. Through extensive experiments and field studies, the evaluation shows that the bit error rates (BERs) can be controlled to be less than 0.1 when the communication distance is within 2 meters.
{"title":"A Fine-grained Modulation Technology for ZigBee Backscatter Communication","authors":"Z. Xu, Yuan Ding, Wei Gong","doi":"10.1109/mms55062.2022.9825557","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825557","url":null,"abstract":"This paper presents the first symbol-level modu-lation technology for ZigBee backscatter communication. The developed backscatter tag, leveraging ambient ZigBee transmissions as radio frequency (RF) carrier excitation, conveys data by translating an excitation signal into a new ZigBee signal in neighboring ZigBee channels. This avoids the strong interference from the ambient excitation signals. The key enabling technique is a symbol-level codeword translation, which exploits square waves based on the difference between the excitation and tag data. A working prototype was successfully demonstrated to validate the modulation technology, which consists of two parts: an RF front-end circuit and an FPG A-based control circuit. Through extensive experiments and field studies, the evaluation shows that the bit error rates (BERs) can be controlled to be less than 0.1 when the communication distance is within 2 meters.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127273161","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825552
M. Fiore, N. Di Modugno, Cristian Bruno, Tommaso De Nicolo, Rocco Di Modugno, Fabio Lobascio
An experimental setup with a solid-state microwave generator and experimental probes has been used to generate controlled ablation patterns on ex-vivo tissues. Correlation of obtained ablation patterns with microwave delivery parameters and probe types has been investigated and characterized.
{"title":"Temperature-sensitive experimental medical treatments with solid-state microwave generator","authors":"M. Fiore, N. Di Modugno, Cristian Bruno, Tommaso De Nicolo, Rocco Di Modugno, Fabio Lobascio","doi":"10.1109/mms55062.2022.9825552","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825552","url":null,"abstract":"An experimental setup with a solid-state microwave generator and experimental probes has been used to generate controlled ablation patterns on ex-vivo tissues. Correlation of obtained ablation patterns with microwave delivery parameters and probe types has been investigated and characterized.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114764400","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825520
E. Cardillo, Luigi Ferro
In this contribution, the feasibility of a short-range ship collision avoidance system has been investigated. Based on microwave and millimeter wave radars, the system has the aim to accurately detect the presence and distance of possible obstacles inside the harbor. Indeed, whereas ships are usually equipped with long-range radars for the open-see navigation, the in-harbor navigation relies only on the manual ability of the captain. An accurate model of the real scenario is proposed by taking into account obstacles of interest like small ships and shore structures. Different operating frequencies have been considered and evaluated, thus proposing a reliable system able to effectively assist the navigation. This contribution paves the way for enabling the concept of autonomous ship navigation by exploiting advanced sensing technologies.
{"title":"Multi-Frequency Analysis of Microwave and Millimeter-Wave Radars for Ship Collision Avoidance","authors":"E. Cardillo, Luigi Ferro","doi":"10.1109/mms55062.2022.9825520","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825520","url":null,"abstract":"In this contribution, the feasibility of a short-range ship collision avoidance system has been investigated. Based on microwave and millimeter wave radars, the system has the aim to accurately detect the presence and distance of possible obstacles inside the harbor. Indeed, whereas ships are usually equipped with long-range radars for the open-see navigation, the in-harbor navigation relies only on the manual ability of the captain. An accurate model of the real scenario is proposed by taking into account obstacles of interest like small ships and shore structures. Different operating frequencies have been considered and evaluated, thus proposing a reliable system able to effectively assist the navigation. This contribution paves the way for enabling the concept of autonomous ship navigation by exploiting advanced sensing technologies.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131040805","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825543
Alper Turkeli, A. Gorur, Y. Altuncu
In this paper, a novel microstrip-fed filter-antenna (filtenna) exhibiting dual-wideband response is introduced. In this direction, a dual-wideband bandpass filter is designed first and then it is integrated into the feed line of a wideband monopole microstrip antenna. The dual-wideband bandpass filter is constructed by stub loaded multi-mode resonators. Two types of stub-loaded multi-mode resonators are coupled to the feeding lines from the filter's input and output ports. The proposed topology allows controlling both bandwidths independently. The designed filtenna was fabricated for the experimental verification. Measurements of the fabricated filtenna show a good agreement with the simulated results. Center frequencies of the proposed filtenna are 3.23 and 5.65 GHz with the fractional bandwidths (FBWs) of 46 % and 21.6 %.
{"title":"Design of a Novel Dual-Wideband Filtenna","authors":"Alper Turkeli, A. Gorur, Y. Altuncu","doi":"10.1109/mms55062.2022.9825543","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825543","url":null,"abstract":"In this paper, a novel microstrip-fed filter-antenna (filtenna) exhibiting dual-wideband response is introduced. In this direction, a dual-wideband bandpass filter is designed first and then it is integrated into the feed line of a wideband monopole microstrip antenna. The dual-wideband bandpass filter is constructed by stub loaded multi-mode resonators. Two types of stub-loaded multi-mode resonators are coupled to the feeding lines from the filter's input and output ports. The proposed topology allows controlling both bandwidths independently. The designed filtenna was fabricated for the experimental verification. Measurements of the fabricated filtenna show a good agreement with the simulated results. Center frequencies of the proposed filtenna are 3.23 and 5.65 GHz with the fractional bandwidths (FBWs) of 46 % and 21.6 %.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131186401","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825535
Ana Buesa-Zubiria, J. Esteban
The relationship between the attenuation constant and the quality factor for any kind of propagation media (TEM or not) has been derived. Also, the relationship between the quality factor and the complex resonant frequency has been demonstrated along this communication. Both expressions permit the characterization of any transmission medium. As an example, the correct calculation of the attenuation constant of a ridge gap waveguide has been carried out using commercial software.
{"title":"On the Attenuation Constant Calculation in Periodic Transmission Media","authors":"Ana Buesa-Zubiria, J. Esteban","doi":"10.1109/mms55062.2022.9825535","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825535","url":null,"abstract":"The relationship between the attenuation constant and the quality factor for any kind of propagation media (TEM or not) has been derived. Also, the relationship between the quality factor and the complex resonant frequency has been demonstrated along this communication. Both expressions permit the characterization of any transmission medium. As an example, the correct calculation of the attenuation constant of a ridge gap waveguide has been carried out using commercial software.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129249938","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825551
Frances Imperato, P. Burghignoli, D. Zografopoulos, R. Beccherelli, A. Galli, W. Fuscaldo
Very few designs are reported in the terahertz range for realizing dynamic beam-steering of the antenna radiation pattern at a fixed frequency. In this work, we propose a one-dimensional leaky-wave antenna based on nematic liquid crystals (NLC). More specifically, an NLC cell is sandwiched between two foam layers, the top one patterned with a partially reflecting sheet (PRS), and the bottom one entirely metalized to have a ground plane. Two lateral perfect magnetic conductor walls allow for a dominant TM leaky mode propagating in the structure. The beam is then steered by applying a low-frequency driving voltage through the ground and the PRS. The trade-off among radiation efficiency, angular steering range, and gain that commonly affects any reconfigurable antenna is properly handled through a suitable choice of the design parameters. Full-wave results are finally provided to demonstrate the concept.
{"title":"Design of a Tunable THz 1-D Leaky-Wave Antenna based on Nematic Liquid Crystals","authors":"Frances Imperato, P. Burghignoli, D. Zografopoulos, R. Beccherelli, A. Galli, W. Fuscaldo","doi":"10.1109/mms55062.2022.9825551","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825551","url":null,"abstract":"Very few designs are reported in the terahertz range for realizing dynamic beam-steering of the antenna radiation pattern at a fixed frequency. In this work, we propose a one-dimensional leaky-wave antenna based on nematic liquid crystals (NLC). More specifically, an NLC cell is sandwiched between two foam layers, the top one patterned with a partially reflecting sheet (PRS), and the bottom one entirely metalized to have a ground plane. Two lateral perfect magnetic conductor walls allow for a dominant TM leaky mode propagating in the structure. The beam is then steered by applying a low-frequency driving voltage through the ground and the PRS. The trade-off among radiation efficiency, angular steering range, and gain that commonly affects any reconfigurable antenna is properly handled through a suitable choice of the design parameters. Full-wave results are finally provided to demonstrate the concept.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133167393","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825616
C. Mustacchio, L. Boccia, E. Arnieri, G. Amendola
A wideband aperture coupled rhomboid magneto-electric (ME) dipole for millimeter-wave applications is proposed in this article. The electric dipole is formed by four identical rhomboid patches, while the magnetic dipole is composed by four vertical metallic shorted vias. The use of the rhomboid patches flattens and enlarges the impedance matching bandwidth of the proposed radiating element and powers up the radiating element gain. The proposed configuration is fed using a substrate integrated waveguide (SIW). To proof the proposed idea, a comparison with a simple ME-dipole antenna has been done. The simulated impedance bandwidth with |S11| < −10 dB for the proposed SIW-fed wideband aperture coupled rhomboid ME-dipole is 25% (72–92 GHz). The simulated antenna peak gain is 11.1 dBi at 74 GHz and the 3-dB beamwidth is stable within the band of interest (E-band). The simulations have been performed with Ansys High-Frequency Simulation Software (HFSS). The proposed millimeter wave rhomboid ME dipole antenna can be a valid candidate for applications related to the new 5G technology, especially for 5G backhauling systems scenarios as it targets the E-Band (71–86 GHz).
{"title":"A wideband aperture coupled Rhomboid Magneto-Electric Dipole Antenna for Millimeter Wave Applications","authors":"C. Mustacchio, L. Boccia, E. Arnieri, G. Amendola","doi":"10.1109/mms55062.2022.9825616","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825616","url":null,"abstract":"A wideband aperture coupled rhomboid magneto-electric (ME) dipole for millimeter-wave applications is proposed in this article. The electric dipole is formed by four identical rhomboid patches, while the magnetic dipole is composed by four vertical metallic shorted vias. The use of the rhomboid patches flattens and enlarges the impedance matching bandwidth of the proposed radiating element and powers up the radiating element gain. The proposed configuration is fed using a substrate integrated waveguide (SIW). To proof the proposed idea, a comparison with a simple ME-dipole antenna has been done. The simulated impedance bandwidth with |S11| < −10 dB for the proposed SIW-fed wideband aperture coupled rhomboid ME-dipole is 25% (72–92 GHz). The simulated antenna peak gain is 11.1 dBi at 74 GHz and the 3-dB beamwidth is stable within the band of interest (E-band). The simulations have been performed with Ansys High-Frequency Simulation Software (HFSS). The proposed millimeter wave rhomboid ME dipole antenna can be a valid candidate for applications related to the new 5G technology, especially for 5G backhauling systems scenarios as it targets the E-Band (71–86 GHz).","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133670942","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825595
P. Wei
A compact range lined with rows of absorbers on all sides would offer a unique opportunity for the curious mind to study its diffraction effect even under very dim illumination [1]. An extended long object usually gives rise to a bright reflection (glint) when viewed near its surface normal. To take advantage of this phenomenon, a discrete Fourier transform (DFT) on RCS measurements would yield a spectrum of incident wave distribution along that object [2]. Some interesting physics are discussed.
{"title":"Observation of diffraction from absorber array and field-probe using long vertical objects","authors":"P. Wei","doi":"10.1109/mms55062.2022.9825595","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825595","url":null,"abstract":"A compact range lined with rows of absorbers on all sides would offer a unique opportunity for the curious mind to study its diffraction effect even under very dim illumination [1]. An extended long object usually gives rise to a bright reflection (glint) when viewed near its surface normal. To take advantage of this phenomenon, a discrete Fourier transform (DFT) on RCS measurements would yield a spectrum of incident wave distribution along that object [2]. Some interesting physics are discussed.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133857114","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825534
M. Oldoni, S. Moscato, Steven Caicedo Mejillones, Andrea Giannini
This manuscript presents a technique to perform the initial design of a transmitting phased array in order to provide a given EIRP within a prescribed scan angle while limiting the overall power consumption. Such constraints are typically found in commercial Earth-observation satellite missions. The paper discusses a closed-form approach yielding the optimum number of elements and power capabilities of each transmitting element, from which the antenna elements and the overall array size can be then obtained. A numerical simulated example is provided to support this simple technique.
{"title":"Phased Array Design for Bounded-Power Consumption Onboard Spacecraft","authors":"M. Oldoni, S. Moscato, Steven Caicedo Mejillones, Andrea Giannini","doi":"10.1109/mms55062.2022.9825534","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825534","url":null,"abstract":"This manuscript presents a technique to perform the initial design of a transmitting phased array in order to provide a given EIRP within a prescribed scan angle while limiting the overall power consumption. Such constraints are typically found in commercial Earth-observation satellite missions. The paper discusses a closed-form approach yielding the optimum number of elements and power capabilities of each transmitting element, from which the antenna elements and the overall array size can be then obtained. A numerical simulated example is provided to support this simple technique.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133851351","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825526
Vincenza Portosi, A. Loconsole, M. Valori, V. Marrocco, F. Bonelli, G. Pascazio, Vito Lampignano, Antonella Fasano, F. Prudenzano
The insertion of a metamaterial (MTM) lens based on Closed Loop Resonator (CLR) into a needle microwave applicator is investigated for a more efficient hyperthermia cancer therapy. Several geometries are designed and optimized, Closed Circular-Ring Resonator (CCRR) with circular loops and Closed Square-Ring Resonator (CSRR) with square loops, with one or more concentric loops. The MTM lens is bended around to the radiating section of the antenna to form a cylindrical 3D structure. Preliminary investigations have been focused to increase the device feasibility and patient wellness. The applicator is a slot coaxial antenna inserted into a surgical needle of 16 G and operating around at the center of Industrial, Scientific, and Medical (ISM) frequency band. The experimental results pertaining to a preliminary fabricated prototype of needle applicator are encouraging, and the simulation results suggest that they could be improved by using the investigated MTM lens.
研究了一种基于闭环谐振器(CLR)的超材料(MTM)透镜插入针微波应用器中，以提高热疗癌症的效率。设计和优化了几种几何形状，环形闭合环谐振器(CCRR)和方形闭合环谐振器(CSRR)，具有一个或多个同心圆环。MTM透镜绕天线的辐射部分弯曲以形成圆柱形三维结构。初步调查的重点是提高设备的可行性和患者的健康。应用器是一根插在16g的手术针上的槽形同轴天线，在ISM (Industrial, Scientific, and Medical)频段中心工作。初步制作的针涂器样机的实验结果令人鼓舞，模拟结果表明，使用所研究的MTM透镜可以改善针涂器的性能。
{"title":"Refinement of a Microwave Needle Applicator for Cancer Therapy via Metamaterials","authors":"Vincenza Portosi, A. Loconsole, M. Valori, V. Marrocco, F. Bonelli, G. Pascazio, Vito Lampignano, Antonella Fasano, F. Prudenzano","doi":"10.1109/mms55062.2022.9825526","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825526","url":null,"abstract":"The insertion of a metamaterial (MTM) lens based on Closed Loop Resonator (CLR) into a needle microwave applicator is investigated for a more efficient hyperthermia cancer therapy. Several geometries are designed and optimized, Closed Circular-Ring Resonator (CCRR) with circular loops and Closed Square-Ring Resonator (CSRR) with square loops, with one or more concentric loops. The MTM lens is bended around to the radiating section of the antenna to form a cylindrical 3D structure. Preliminary investigations have been focused to increase the device feasibility and patient wellness. The applicator is a slot coaxial antenna inserted into a surgical needle of 16 G and operating around at the center of Industrial, Scientific, and Medical (ISM) frequency band. The experimental results pertaining to a preliminary fabricated prototype of needle applicator are encouraging, and the simulation results suggest that they could be improved by using the investigated MTM lens.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121393587","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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