Pub Date : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343476
S. Koziel, A. Pietrenko‐Dabrowska, Q. Cheng
Fast surrogate models may alleviate the difficulties pertinent to high computational cost of electromagnetic (EM)-driven design procedures. Approximation surrogates are by far the most popular but their applicability to antenna modeling is severely limited by the curse of dimensionality. Domain confinement, as in the recently proposed nested kriging approach, offers a viable workaround this issue, in particular, enables the construction of reliable surrogates over wide ranges of antenna operating conditions and geometry parameters. Unfortunately, the original nested kriging method requires the user to set up the domain thickness (the ratio of its lateral to tangential size). The value of this parameter is critical for achieving a proper balance between the model predictive power and the cost of training data acquisition. This paper proposes a procedure for automated a priori determination of the domain thickness and highlights the computational benefits associated with the employment of the presented approach using a dual-band dipole antenna example.
{"title":"Antenna Modeling by Nested Kriging with Automated Domain Thickness Determination","authors":"S. Koziel, A. Pietrenko‐Dabrowska, Q. Cheng","doi":"10.1109/NEMO49486.2020.9343476","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343476","url":null,"abstract":"Fast surrogate models may alleviate the difficulties pertinent to high computational cost of electromagnetic (EM)-driven design procedures. Approximation surrogates are by far the most popular but their applicability to antenna modeling is severely limited by the curse of dimensionality. Domain confinement, as in the recently proposed nested kriging approach, offers a viable workaround this issue, in particular, enables the construction of reliable surrogates over wide ranges of antenna operating conditions and geometry parameters. Unfortunately, the original nested kriging method requires the user to set up the domain thickness (the ratio of its lateral to tangential size). The value of this parameter is critical for achieving a proper balance between the model predictive power and the cost of training data acquisition. This paper proposes a procedure for automated a priori determination of the domain thickness and highlights the computational benefits associated with the employment of the presented approach using a dual-band dipole antenna example.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124159877","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343644
Tan-Yi Li, Wenchao Chen, Dawei Wang, Q. Zhan, Guangrong Li, Kai Kang, W. Yin
In this work, an in-house developed parallel-computation simulator is employed to study the electrothermal performance of resistive random access memory (RRAM). To save computing storage, the 3D hexahedral elements are used to discretize the structures. The validity of the in-house simulator is investigated first, and then the thermal crosstalk effect of RRAM array is studied base on simulation results.
{"title":"Parallel Simulation of Resistive Random Access Memory with Hexahedral Elements","authors":"Tan-Yi Li, Wenchao Chen, Dawei Wang, Q. Zhan, Guangrong Li, Kai Kang, W. Yin","doi":"10.1109/NEMO49486.2020.9343644","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343644","url":null,"abstract":"In this work, an in-house developed parallel-computation simulator is employed to study the electrothermal performance of resistive random access memory (RRAM). To save computing storage, the 3D hexahedral elements are used to discretize the structures. The validity of the in-house simulator is investigated first, and then the thermal crosstalk effect of RRAM array is studied base on simulation results.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127754706","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343556
K. Guan, Ge Zhao, M. Tong
A novel a monopole dual frequency MIMO antenna is proposed. The antenna adopts different length of double branch structure, the radiator is broken line processing, the surface current length is increased. In order to improve the isolation of the antenna, the defected ground structure is used and the two radiation elements are symmetrically treated at the same time. The overall size of the antenna is 42 mm 39.7 mm, which is compact and easy to process and integrate. The two frequency points of the antenna are 2.4 GHz and 5.2 GHz, which can be used in WLAN communication. The design structure of the antenna and the influence of different parameters on the performance of the antenna are given.
{"title":"A Compact Monopole MIMO Antenna for WLAN Communications","authors":"K. Guan, Ge Zhao, M. Tong","doi":"10.1109/NEMO49486.2020.9343556","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343556","url":null,"abstract":"A novel a monopole dual frequency MIMO antenna is proposed. The antenna adopts different length of double branch structure, the radiator is broken line processing, the surface current length is increased. In order to improve the isolation of the antenna, the defected ground structure is used and the two radiation elements are symmetrically treated at the same time. The overall size of the antenna is 42 mm 39.7 mm, which is compact and easy to process and integrate. The two frequency points of the antenna are 2.4 GHz and 5.2 GHz, which can be used in WLAN communication. The design structure of the antenna and the influence of different parameters on the performance of the antenna are given.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115777418","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343528
Zhiyi Tang, Mengxin Lin, Yuting Wu, J. Huangfu
A microwave small area localization method based on compressed sensing system is proposed, which works with scattering source at 10 GHz-20 GHz. Three wide-band microwave source antennas are set up and generate scattering fields through obstacles to form a random field in the positioning area. As obstacle reflection, electric field distribution is sufficiently random. Combined with compressed sensing algorithm, target point position can be restored by measured scattered electric field value. Considered the operating frequency band, target is located in a 4 cm-width square area at a distance of 3 cm from the antenna. Positioning accuracy of the system is 1.4 mm when it works at a plate with the sizes of 11 cm× 10 cm. So it can be applied on finger positioning or situations that require a small range of precise wireless positioning. This method has the potential to be used on portable and wearable electronic devices.
{"title":"Simulation of Source Scattering Localization Based on Compressed Sensing","authors":"Zhiyi Tang, Mengxin Lin, Yuting Wu, J. Huangfu","doi":"10.1109/NEMO49486.2020.9343528","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343528","url":null,"abstract":"A microwave small area localization method based on compressed sensing system is proposed, which works with scattering source at 10 GHz-20 GHz. Three wide-band microwave source antennas are set up and generate scattering fields through obstacles to form a random field in the positioning area. As obstacle reflection, electric field distribution is sufficiently random. Combined with compressed sensing algorithm, target point position can be restored by measured scattered electric field value. Considered the operating frequency band, target is located in a 4 cm-width square area at a distance of 3 cm from the antenna. Positioning accuracy of the system is 1.4 mm when it works at a plate with the sizes of 11 cm× 10 cm. So it can be applied on finger positioning or situations that require a small range of precise wireless positioning. This method has the potential to be used on portable and wearable electronic devices.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134516223","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343636
X. Guo, G. Wan, Y. Gao, M. Tong
A novel temperature sensor that does not use external temperature-sensitive materials but employs the characteristics of a dielectric substrate to sense temperature changes is proposed. The sensor is based on chipless RFID tags which can remotely and wirelessly detect the temperature. The effect of temperature on the RFID substrate is investigated and it is found that the dielectric constant of the substrate decreases as the temperature rises. The specific design process of chipless RFID is presented and different antenna structures are simulated and compared. Finally, the simulation results of the design under different temperature changes are given. The sensor uses multiple C-shaped scatterers, which can include more sensitive properties of the substrate to detect the temperature change. As the temperature changes, the position of the formant of the backscattered signal will shift, so that the sensor can be designed based on the relationship between the temperature change and the shift of the formant.
{"title":"A Novel Temperature Sensor Based on Chipless RFID Tags","authors":"X. Guo, G. Wan, Y. Gao, M. Tong","doi":"10.1109/NEMO49486.2020.9343636","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343636","url":null,"abstract":"A novel temperature sensor that does not use external temperature-sensitive materials but employs the characteristics of a dielectric substrate to sense temperature changes is proposed. The sensor is based on chipless RFID tags which can remotely and wirelessly detect the temperature. The effect of temperature on the RFID substrate is investigated and it is found that the dielectric constant of the substrate decreases as the temperature rises. The specific design process of chipless RFID is presented and different antenna structures are simulated and compared. Finally, the simulation results of the design under different temperature changes are given. The sensor uses multiple C-shaped scatterers, which can include more sensitive properties of the substrate to detect the temperature change. As the temperature changes, the position of the formant of the backscattered signal will shift, so that the sensor can be designed based on the relationship between the temperature change and the shift of the formant.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133940320","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343511
Xiaokun Bi, Shao-Hua Guo, Xiao-Zhang, Wai-Sai Wong, Tao Yuan
A novel reconfigurable-bandwidth wideband bandpass filter (WB BPF) with independently controllable notch band is presented. The proposed BPF starts from a terminated cross-shaped resonator (TCSR) with two open-ended stubs and a pair of parallel-coupled lines. Theoretical analysis finds that the filter bandwidth is independently controlled by TCSR, while the center frequencies and bandwidth of notch bands are mainly controlled by the rest parts. As such, a reconfigurable-bandwidth BPF with controllable notch band, whose bandwidth and center frequency are fixed under different work states, can be designed with the help of PIN diodes. As the measured and simulated agree well, a simple and effective design approach of reconfigurable WB BPFs can be validated.
{"title":"Reconfigurable-Bandwidth Wideband Bandpass Filter with Independently Controllable Notch Bands","authors":"Xiaokun Bi, Shao-Hua Guo, Xiao-Zhang, Wai-Sai Wong, Tao Yuan","doi":"10.1109/NEMO49486.2020.9343511","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343511","url":null,"abstract":"A novel reconfigurable-bandwidth wideband bandpass filter (WB BPF) with independently controllable notch band is presented. The proposed BPF starts from a terminated cross-shaped resonator (TCSR) with two open-ended stubs and a pair of parallel-coupled lines. Theoretical analysis finds that the filter bandwidth is independently controlled by TCSR, while the center frequencies and bandwidth of notch bands are mainly controlled by the rest parts. As such, a reconfigurable-bandwidth BPF with controllable notch band, whose bandwidth and center frequency are fixed under different work states, can be designed with the help of PIN diodes. As the measured and simulated agree well, a simple and effective design approach of reconfigurable WB BPFs can be validated.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134310552","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343507
Yuefang Zhu, Zihang Qi, P.-S. Ji, Wenyu Zhao, Xiuping Li
A 2×2 ring-loading rectangular patch antenna array with high gain and low sidelobe is proposed and designed at 55-GHz. The antenna array consists of a H-type substrate integrated waveguide (SIW) power divider, rectangular substrate integrated cavity (SIC), and radiation elements. The radiation element comprises a ring-loading rectangular patch and a backed cavity. A wide coupling slot on the upper surface of the SIC is used to excite the patch while the longitudinal slot on the SIW couples electromagnetic waves into the SIC. The proposed antenna array achieves a low sidelobe level below 13 dB by reducing the spacing of antenna elements. Simulated−results show that 10-dB impedance bandwidth of the proposed antenna array is −19.36% (48.75-59.2 GHz) with a peak gain of 14 dBi at 59 GHz.
{"title":"55-GHz Low Sidelobe Ring-Loading Patch Antenna on LTCC Technology","authors":"Yuefang Zhu, Zihang Qi, P.-S. Ji, Wenyu Zhao, Xiuping Li","doi":"10.1109/NEMO49486.2020.9343507","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343507","url":null,"abstract":"A 2×2 ring-loading rectangular patch antenna array with high gain and low sidelobe is proposed and designed at 55-GHz. The antenna array consists of a H-type substrate integrated waveguide (SIW) power divider, rectangular substrate integrated cavity (SIC), and radiation elements. The radiation element comprises a ring-loading rectangular patch and a backed cavity. A wide coupling slot on the upper surface of the SIC is used to excite the patch while the longitudinal slot on the SIW couples electromagnetic waves into the SIC. The proposed antenna array achieves a low sidelobe level below 13 dB by reducing the spacing of antenna elements. Simulated−results show that 10-dB impedance bandwidth of the proposed antenna array is −19.36% (48.75-59.2 GHz) with a peak gain of 14 dBi at 59 GHz.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132801542","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343480
Tiantian Liu, Weijie Wang, Quan Xu, Juelin Leng, Peng Zheng, Yang Yang
Full-wave electromagnetic simulations of real-life engineering modes need the mesh generation with all fine features of the objects and truncated free-space regions. Simple geometrical models can be easily handled by commonly used commercial software, like Ansys, HyperMesh, COMSOL, et. al. However, real-life models, like aircraft systems, electronic systems and antenna systems, always contain tens of thousands of geometrical entities. Thus, it will be extremely difficult and tedious to generate a mesh of the entire model manually. To avoid manual operation in meshing, in this letter, we propose an automatic FEM mesh generation workflow for complex full-wave electromagnetic simulations. In the workflow, we construct the free-space model, compute the mesh size distribution according to the geometrical feature and generate mesh based on mesh size distribution automatically. It has been applied to numbers of real-life simulations, which verifies the validity of the workflow.
{"title":"Three-dimensional Automatic FEM Mesh Generation for Full-wave Electromagnetic Simulations","authors":"Tiantian Liu, Weijie Wang, Quan Xu, Juelin Leng, Peng Zheng, Yang Yang","doi":"10.1109/NEMO49486.2020.9343480","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343480","url":null,"abstract":"Full-wave electromagnetic simulations of real-life engineering modes need the mesh generation with all fine features of the objects and truncated free-space regions. Simple geometrical models can be easily handled by commonly used commercial software, like Ansys, HyperMesh, COMSOL, et. al. However, real-life models, like aircraft systems, electronic systems and antenna systems, always contain tens of thousands of geometrical entities. Thus, it will be extremely difficult and tedious to generate a mesh of the entire model manually. To avoid manual operation in meshing, in this letter, we propose an automatic FEM mesh generation workflow for complex full-wave electromagnetic simulations. In the workflow, we construct the free-space model, compute the mesh size distribution according to the geometrical feature and generate mesh based on mesh size distribution automatically. It has been applied to numbers of real-life simulations, which verifies the validity of the workflow.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130811828","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343465
Qing-Yun Liang, Xin Xu, Peng Yin, Qun Wang
This work explores the possibility of identifying the hidden presence of a radio frequency illegal receiver using an active detection approach. Such wireless receivers are quite difficult to detect because they only receiving wireless signals and never transmit them. In this letter, we show that even a passive receiver might be able to detect by comparing its radar echoes when it is in power on and off states. Using an FM radio as a demonstration, the radar back-scattering characteristics of the telescopic antenna loaded with LC circuits in the FM band is simulated in the full-wave solver. In addition, time-domain radar echoes for different waveforms are studied to investigate the performance of hidden receiver detection.
{"title":"An active detection approach for hidden radio-frequency receivers discovery","authors":"Qing-Yun Liang, Xin Xu, Peng Yin, Qun Wang","doi":"10.1109/NEMO49486.2020.9343465","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343465","url":null,"abstract":"This work explores the possibility of identifying the hidden presence of a radio frequency illegal receiver using an active detection approach. Such wireless receivers are quite difficult to detect because they only receiving wireless signals and never transmit them. In this letter, we show that even a passive receiver might be able to detect by comparing its radar echoes when it is in power on and off states. Using an FM radio as a demonstration, the radar back-scattering characteristics of the telescopic antenna loaded with LC circuits in the FM band is simulated in the full-wave solver. In addition, time-domain radar echoes for different waveforms are studied to investigate the performance of hidden receiver detection.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132708753","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343527
Jinliang Cai, Zhen Wang, F. Qin
Coupling currents of key wires fixed on an automotive engine were simulated under the consideration of wideband high power microwave (HPM). An electromagnetic model of an automotive engine was built with the consideration of wires connected camshaft and injector separately. Simulation results show that coupling currents are much larger than the working currents of electric devices, and disturbances’ frequency characters contain the resonant characters of wires and the spectrum of wideband HPM.
{"title":"Wideband High Power Microwave Coupling Analysis of Automotive Engine","authors":"Jinliang Cai, Zhen Wang, F. Qin","doi":"10.1109/NEMO49486.2020.9343527","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343527","url":null,"abstract":"Coupling currents of key wires fixed on an automotive engine were simulated under the consideration of wideband high power microwave (HPM). An electromagnetic model of an automotive engine was built with the consideration of wires connected camshaft and injector separately. Simulation results show that coupling currents are much larger than the working currents of electric devices, and disturbances’ frequency characters contain the resonant characters of wires and the spectrum of wideband HPM.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133216657","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：