Pub Date : 2020-08-01DOI: 10.1109/UCET51115.2020.9205363
Siyu Wu, Amir M. Abdulghani, Shuja Ansari, M. Imran, Q. Abbasi
Green technology for economically viable engineering designs and sustainable environment is highly desirable for future smart city applications. An intelligent system for operating and controlling lighting in order to save energy is developed and presented in this article. The system is implemented on Alibaba Cloud IoT platform on STM32 development board using STM32 medium-density performing microcontroller with high performance ARM® Cortex®-M3 RISC core. It includes communication between wireless sensors and actuators, and control of light sources. The HC-SR501 human infrared sensor is also used for detecting people and BH170 photosensitive sensor for synthetic brightness detection. The system includes indicators to represent three orders of magnitude of temperature sensor reading. The system developed in this work also features (i) an OLED display unit enabling users to view sensed data easily and (ii) Web platform-based User Interface (dashboard) for allowing users to easily interact with the system. The overall system provides a practical and interactive solution for data visualization and to remotely control light sources.
{"title":"IoT enabled Smart Lighting System using STM32 microcontroller with high performance ARM® Cortex®-M3 core","authors":"Siyu Wu, Amir M. Abdulghani, Shuja Ansari, M. Imran, Q. Abbasi","doi":"10.1109/UCET51115.2020.9205363","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205363","url":null,"abstract":"Green technology for economically viable engineering designs and sustainable environment is highly desirable for future smart city applications. An intelligent system for operating and controlling lighting in order to save energy is developed and presented in this article. The system is implemented on Alibaba Cloud IoT platform on STM32 development board using STM32 medium-density performing microcontroller with high performance ARM® Cortex®-M3 RISC core. It includes communication between wireless sensors and actuators, and control of light sources. The HC-SR501 human infrared sensor is also used for detecting people and BH170 photosensitive sensor for synthetic brightness detection. The system includes indicators to represent three orders of magnitude of temperature sensor reading. The system developed in this work also features (i) an OLED display unit enabling users to view sensed data easily and (ii) Web platform-based User Interface (dashboard) for allowing users to easily interact with the system. The overall system provides a practical and interactive solution for data visualization and to remotely control light sources.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131339389","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205472
W. A. Awan, S. Naqvi, Niamat Hussain, A. Zaidi, A. H. Naqvi, A. Hameed
A Co-Planar Waveguide (CPW) Fed frequency reconfigurable antenna for compact portable devices and heterogeneous applications is presented in this paper. The antenna offers a small electrical size of $0.17 lambda_{0} times 0.12 lambda_{0} times 0.013 lambda 0$, where} $lambda_{0}$ correspond to free space wavelength at lowest resonance. The geometrical configuration of the antenna comprises of the simple structure consist of a triangular radiator connected with two serpentines by means of the diode. By switching the diode state the antenna either operates in single wideband mode, dual-band mode or 2 tri-band modes. To verify the performance parameters of proposed work a prototype was fabricated and measured. Moreover, to demonstrate the potential of the proposed work it is compared with the state of the artworks.
{"title":"Electrically Small Frequency Reconfigurable Antenna for Heterogeneous Applications","authors":"W. A. Awan, S. Naqvi, Niamat Hussain, A. Zaidi, A. H. Naqvi, A. Hameed","doi":"10.1109/UCET51115.2020.9205472","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205472","url":null,"abstract":"A Co-Planar Waveguide (CPW) Fed frequency reconfigurable antenna for compact portable devices and heterogeneous applications is presented in this paper. The antenna offers a small electrical size of $0.17 lambda_{0} times 0.12 lambda_{0} times 0.013 lambda 0$, where} $lambda_{0}$ correspond to free space wavelength at lowest resonance. The geometrical configuration of the antenna comprises of the simple structure consist of a triangular radiator connected with two serpentines by means of the diode. By switching the diode state the antenna either operates in single wideband mode, dual-band mode or 2 tri-band modes. To verify the performance parameters of proposed work a prototype was fabricated and measured. Moreover, to demonstrate the potential of the proposed work it is compared with the state of the artworks.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128341791","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205477
S. Awan, Asif Nawaz, Sheeraz Ahmed, Hasan Ali Khattak, Khalid Zaman, Dr.Zeeshan Najam
Ensuring food safety requires to fully monitor the overall process of handling food, preparation as well as storage of food in such a way that it reduces the risk of people getting sick due to undue cleanliness or any mismanagement in the overall process. Smart agricultural includes an efficient, clean and safe food supply chain system that can tackle these issues more smartly than that of existing system. Agricultural food supply chain denotes the mechanism explaining how the farm food comes to our tables. The research presents a smart model for the transformation of traditional food supply chain considering Blockchain Technology. The model promises to give all stakeholders participating in the agricultural food supply chain equal opportunities even if they are not familiar to each other but without the help of trustworthy third party service provider. We validate proposed blockchain based smart model with our own scheme without using blockchain.
{"title":"Blockchain based Smart Model for Agricultural Food Supply Chain","authors":"S. Awan, Asif Nawaz, Sheeraz Ahmed, Hasan Ali Khattak, Khalid Zaman, Dr.Zeeshan Najam","doi":"10.1109/UCET51115.2020.9205477","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205477","url":null,"abstract":"Ensuring food safety requires to fully monitor the overall process of handling food, preparation as well as storage of food in such a way that it reduces the risk of people getting sick due to undue cleanliness or any mismanagement in the overall process. Smart agricultural includes an efficient, clean and safe food supply chain system that can tackle these issues more smartly than that of existing system. Agricultural food supply chain denotes the mechanism explaining how the farm food comes to our tables. The research presents a smart model for the transformation of traditional food supply chain considering Blockchain Technology. The model promises to give all stakeholders participating in the agricultural food supply chain equal opportunities even if they are not familiar to each other but without the help of trustworthy third party service provider. We validate proposed blockchain based smart model with our own scheme without using blockchain.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130629281","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205353
Haoran Ma, Zhe Shen, Ziyao Wang, Jiawei Peng
We propose a polarization-insensitive beam splitter based on metasurface consist of cylinders with two types of phase gradients in the opposite directions. By changing the phase gradient, we found the incident light split into different directions. We set a phase buffer area to get different ratios of energy in the splitting direction to achieve adjustable splitting ratios from 0.2 to 1. This kind of beam splitter can be used in various optical systems such as multiplexers, interferometers for integrated optical circuits.
{"title":"Polarization-insensitive beam splitters with variable split ratios based on phase gradient metasurfaces","authors":"Haoran Ma, Zhe Shen, Ziyao Wang, Jiawei Peng","doi":"10.1109/UCET51115.2020.9205353","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205353","url":null,"abstract":"We propose a polarization-insensitive beam splitter based on metasurface consist of cylinders with two types of phase gradients in the opposite directions. By changing the phase gradient, we found the incident light split into different directions. We set a phase buffer area to get different ratios of energy in the splitting direction to achieve adjustable splitting ratios from 0.2 to 1. This kind of beam splitter can be used in various optical systems such as multiplexers, interferometers for integrated optical circuits.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131664202","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205415
Urooj Qamar, Atika Faryal, F. A. Tahir
In this paper a dual band chiral metasurface is presented for linear to circular polarization conversion. The structure consists of two resonators and the unit cell is rotated 90° to obtain a chiral geometry. The circular polarization is achieved when co- and cross- transmission coefficients have equal magnitudes with 90° phase difference. The axial ratio is below 3dB within two frequency bands ranging from 5.84GHz-5.99GHz and 7.80GHz-8.09GHz showing circular polarization conversion.
{"title":"Linear to Circular Asymmetric Transmission based on Chiral Metasurface","authors":"Urooj Qamar, Atika Faryal, F. A. Tahir","doi":"10.1109/UCET51115.2020.9205415","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205415","url":null,"abstract":"In this paper a dual band chiral metasurface is presented for linear to circular polarization conversion. The structure consists of two resonators and the unit cell is rotated 90° to obtain a chiral geometry. The circular polarization is achieved when co- and cross- transmission coefficients have equal magnitudes with 90° phase difference. The axial ratio is below 3dB within two frequency bands ranging from 5.84GHz-5.99GHz and 7.80GHz-8.09GHz showing circular polarization conversion.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130113748","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205386
Ruitao Jia, Tianxian Zhang, Yuanhang Wang, Yanhong Deng, L. Kong
In this paper, considering a range gate pull-off (RGPO) jamming for self-defense jamming, an optimal multiframe RGPO jamming strategy is investigated with unknown environment model. The optimal RGPO jamming strategy problem is solved by proposing a multi-frame RGPO jamming strategy optimization method based on black-box optimization technique. Firstly, we construct a multi-frame optimization model of RGPO jamming strategy by choosing the success rate of pull-off as the objective function. Then, to improve the jamming performance, a particle swarm optimization(PSO) algorithm based on Monte Carlo prediction fitness function(MC-PSO) is proposed. Finally, numerical simulation results are provided to verify the validity of the proposed method.
{"title":"An Intelligent Range Gate Pull-off (RGPO) Jamming Method","authors":"Ruitao Jia, Tianxian Zhang, Yuanhang Wang, Yanhong Deng, L. Kong","doi":"10.1109/UCET51115.2020.9205386","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205386","url":null,"abstract":"In this paper, considering a range gate pull-off (RGPO) jamming for self-defense jamming, an optimal multiframe RGPO jamming strategy is investigated with unknown environment model. The optimal RGPO jamming strategy problem is solved by proposing a multi-frame RGPO jamming strategy optimization method based on black-box optimization technique. Firstly, we construct a multi-frame optimization model of RGPO jamming strategy by choosing the success rate of pull-off as the objective function. Then, to improve the jamming performance, a particle swarm optimization(PSO) algorithm based on Monte Carlo prediction fitness function(MC-PSO) is proposed. Finally, numerical simulation results are provided to verify the validity of the proposed method.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128813025","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205369
Jun Deng, Qiwei Xu, A. Ren, Yupeng Duan, A. Zahid, Q. Abbasi
The application of inertial measurement unit (IMU) is widespread in many domains, but the main hindrance in localization is the errors accumulation in the integration process over a long time. Recently, we notice that many researchers have applied machine learning (ML) algorithms to indoor positioning by using IMU sensor data, which sufficiently proves that the 6-dim data collected by IMU sensor contain a lot of information. In this paper, we present a ML driven method to make a regression between IMU sensor data and 2-D coordinates. To build a regression model with better generalization and lower computational complexity, this paper carries out feature extraction in the time-and time-frequency domain. The simulation run on Intel core i5-4200h shows that the method is able to suppress the drift of the inertial navigation system after a long-time travel. In comparison of GPS+IMU using extended Kalman filtering (EKF), the positioning RMS of our method on circular trajectories with a radius of 7 meters and 10.5 meters is reduced by at most 70.1% and 86.1%, respectively.
{"title":"Machine Learning Driven Method for Indoor Positioning Using Inertial Measurement Unit","authors":"Jun Deng, Qiwei Xu, A. Ren, Yupeng Duan, A. Zahid, Q. Abbasi","doi":"10.1109/UCET51115.2020.9205369","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205369","url":null,"abstract":"The application of inertial measurement unit (IMU) is widespread in many domains, but the main hindrance in localization is the errors accumulation in the integration process over a long time. Recently, we notice that many researchers have applied machine learning (ML) algorithms to indoor positioning by using IMU sensor data, which sufficiently proves that the 6-dim data collected by IMU sensor contain a lot of information. In this paper, we present a ML driven method to make a regression between IMU sensor data and 2-D coordinates. To build a regression model with better generalization and lower computational complexity, this paper carries out feature extraction in the time-and time-frequency domain. The simulation run on Intel core i5-4200h shows that the method is able to suppress the drift of the inertial navigation system after a long-time travel. In comparison of GPS+IMU using extended Kalman filtering (EKF), the positioning RMS of our method on circular trajectories with a radius of 7 meters and 10.5 meters is reduced by at most 70.1% and 86.1%, respectively.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124368309","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205458
Zhiying Xia, Bin Xu, Yang Zhang, K. Gu, Xuefeng Liu, Jichuan Xiong
In laser additive manufacturing, the optical absorption characteristics of particles play a fundamental role in its application. As a non-destructive, high resolution, high contrast test method, photoacoustic imaging uses the endogenous optical absorption characteristics of the sample for imaging and obtains the structural and functional information of the sample. In this paper, photoacoustic imaging is utilized to conduct an experimental study on the absorption properties of the micro-sized copper balls. The experimental results show that this method can effectively map the absorption distribution characteristics of micro-particles, which is of great importance for quality control in laser additive manufacturing.
{"title":"Photoacoustic Microscopy of Optical Absorption Distribution of Micron-sized Copper Balls","authors":"Zhiying Xia, Bin Xu, Yang Zhang, K. Gu, Xuefeng Liu, Jichuan Xiong","doi":"10.1109/UCET51115.2020.9205458","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205458","url":null,"abstract":"In laser additive manufacturing, the optical absorption characteristics of particles play a fundamental role in its application. As a non-destructive, high resolution, high contrast test method, photoacoustic imaging uses the endogenous optical absorption characteristics of the sample for imaging and obtains the structural and functional information of the sample. In this paper, photoacoustic imaging is utilized to conduct an experimental study on the absorption properties of the micro-sized copper balls. The experimental results show that this method can effectively map the absorption distribution characteristics of micro-particles, which is of great importance for quality control in laser additive manufacturing.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124598934","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205322
S. M. Hamza, H. Ullah, F. A. Tahir
A compact design of ultra-wide band (UWB) log-periodic dipole array (LPDA) antenna printed on FR-4 substrate is presented. The proposed design consists of array of printed dipoles fed by a coaxial cable. The dimensions of the printed dipoles and the spacing between the array elements are optimized by parametric simulations using full wave simulator. The size of the fabricated LPDA antenna is 0.9 $lambda times 0.33 lambda (135 times 50 mm^{2})$. The antenna has a fractional bandwidth of 133% and covers the band from 2.2 GHz to 11 GHz. The antenna exhibits a consistent end-fire radiation patterns over the whole operating band of 2.2-11 GHz with a maximum operating gain of 8.6 dBi.
{"title":"A Miniaturized Printed UWB LPDA Antenna","authors":"S. M. Hamza, H. Ullah, F. A. Tahir","doi":"10.1109/UCET51115.2020.9205322","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205322","url":null,"abstract":"A compact design of ultra-wide band (UWB) log-periodic dipole array (LPDA) antenna printed on FR-4 substrate is presented. The proposed design consists of array of printed dipoles fed by a coaxial cable. The dimensions of the printed dipoles and the spacing between the array elements are optimized by parametric simulations using full wave simulator. The size of the fabricated LPDA antenna is 0.9 $lambda times 0.33 lambda (135 times 50 mm^{2})$. The antenna has a fractional bandwidth of 133% and covers the band from 2.2 GHz to 11 GHz. The antenna exhibits a consistent end-fire radiation patterns over the whole operating band of 2.2-11 GHz with a maximum operating gain of 8.6 dBi.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132068875","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 : 2020-08-01DOI: 10.1109/UCET51115.2020.9205425
Zimo Zhao, Michael E. Farage, Yi Yi, Chong Li
In this paper we demonstrate a simple single-pixel quasi-optical imaging setup with a one-port 140 GHz-220 GHz vector network analyser (VNA), a pyramidal horn antenna, a plano-convex lens and an X-Y translation stage. By placing an object at the focal plane of the lens and measuring its one-port S-parameters while scanning the object fixed onto the X-Y translation stage, 2D images of the object are constructed using S-parameter magnitude and phase information. The results show that the phase constructed image is better than magnitude constructed image in some cases. This finding indicates that VNA can be useful in THz imaging as it provides more information from the perspective of phase which can be used to enhance imaging.
{"title":"A Quasi-optical THz Imaging System Using a One-port Vector Network Analyser","authors":"Zimo Zhao, Michael E. Farage, Yi Yi, Chong Li","doi":"10.1109/UCET51115.2020.9205425","DOIUrl":"https://doi.org/10.1109/UCET51115.2020.9205425","url":null,"abstract":"In this paper we demonstrate a simple single-pixel quasi-optical imaging setup with a one-port 140 GHz-220 GHz vector network analyser (VNA), a pyramidal horn antenna, a plano-convex lens and an X-Y translation stage. By placing an object at the focal plane of the lens and measuring its one-port S-parameters while scanning the object fixed onto the X-Y translation stage, 2D images of the object are constructed using S-parameter magnitude and phase information. The results show that the phase constructed image is better than magnitude constructed image in some cases. This finding indicates that VNA can be useful in THz imaging as it provides more information from the perspective of phase which can be used to enhance imaging.","PeriodicalId":163493,"journal":{"name":"2020 International Conference on UK-China Emerging Technologies (UCET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130892747","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：