Pub Date : 2019-11-01DOI: 10.2991/pntim-19.2019.59
Yan Fuli, Hou Xingzhe
Line loss can be divided into statistical line loss, technical line loss and management line loss according to structure. It not only refers to the energy loss in the form of heat energy, but also the management line loss caused by the electricity stealing behavior [1]. The calculation of power system line loss and the realization of system lean management are of great significance in guiding the reduction of energy conservation and the promotion of line loss management. To this end, in-depth analysis of the massive user data accumulated in the marketing automation process of the electricity information system in recent years, so as to establish a reasonable and efficient mathematical model of line loss analysis. By mining the useful information behind these data in smart electric meter, the abnormal power usage behavior detection of the user is realized, so as to achieve the purpose of preventing electric larceny and leakage and thereby reducing the line loss. This paper proposes a layer-based power line electric larceny detection method based on data mining technology .This method optimizes the traditional LOF algorithm and is a weighted LOF algorithm. By performing weighted outlier analysis on massive user data, the location of abnormal power users can be more efficiently completed. Keywords-Component Management Line Loss, Data Mining; Layer-Based Analysis; Weighted LOF Algorithm; Outlier Analysis; Abnormal User Location
{"title":"Research on Smart Electric Meter Data Mining Technology Method for Line Loss Diagnosis of Low Voltage Station Area","authors":"Yan Fuli, Hou Xingzhe","doi":"10.2991/pntim-19.2019.59","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.59","url":null,"abstract":"Line loss can be divided into statistical line loss, technical line loss and management line loss according to structure. It not only refers to the energy loss in the form of heat energy, but also the management line loss caused by the electricity stealing behavior [1]. The calculation of power system line loss and the realization of system lean management are of great significance in guiding the reduction of energy conservation and the promotion of line loss management. To this end, in-depth analysis of the massive user data accumulated in the marketing automation process of the electricity information system in recent years, so as to establish a reasonable and efficient mathematical model of line loss analysis. By mining the useful information behind these data in smart electric meter, the abnormal power usage behavior detection of the user is realized, so as to achieve the purpose of preventing electric larceny and leakage and thereby reducing the line loss. This paper proposes a layer-based power line electric larceny detection method based on data mining technology .This method optimizes the traditional LOF algorithm and is a weighted LOF algorithm. By performing weighted outlier analysis on massive user data, the location of abnormal power users can be more efficiently completed. Keywords-Component Management Line Loss, Data Mining; Layer-Based Analysis; Weighted LOF Algorithm; Outlier Analysis; Abnormal User Location","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115575962","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.42
Zhang Yang, Yi Huahui, Zhang Ruijie
The study of vulnerability is an important basis for the evaluation of warfare damage in China's weapons and equipment, and it is also an important part of the research on the viability of weapons and equipment in China. In this paper, according to the damage level principle of the aircraft, the damage level of the multi-functional military cabin truck is established. Then we used the damage tree analysis method and Solid works 3D software to construct an equivalent damage model, and identified the key parts and weak points of the cabin car. This will have certain reference application value for further research on the vulnerability and equivalent target of multi-functional military cabins. Keywords-Military Cabin Truck; Vulnerability; Damage Tree Analysis Method; Solidworks Modeling
{"title":"Research on Vulnerability of Multifunctional Military Cabin","authors":"Zhang Yang, Yi Huahui, Zhang Ruijie","doi":"10.2991/pntim-19.2019.42","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.42","url":null,"abstract":"The study of vulnerability is an important basis for the evaluation of warfare damage in China's weapons and equipment, and it is also an important part of the research on the viability of weapons and equipment in China. In this paper, according to the damage level principle of the aircraft, the damage level of the multi-functional military cabin truck is established. Then we used the damage tree analysis method and Solid works 3D software to construct an equivalent damage model, and identified the key parts and weak points of the cabin car. This will have certain reference application value for further research on the vulnerability and equivalent target of multi-functional military cabins. Keywords-Military Cabin Truck; Vulnerability; Damage Tree Analysis Method; Solidworks Modeling","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"38 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120850831","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.72
Z. Fan
With the continuous improvement of technological innovation in construction industry, intelligent building management on the internal environment of the building is also realized. Through the simulation analysis of the building thermal environment, comprehensive reflection on the influence characteristics of the various disturbances under the thermal inertia of the envelope structure is shown in this paper. Based on the bi-linear simulation analysis method, optimal construction method for the temperature regulation of the heat supply end in heating system is explored for the first time, and the application and effect of the optimized construction method is analyzed through specific cases. Therefore, research in this paper has strong engineering application value for optimizing the operation regulation and promoting energy saving in heating system. Keywords-Bi-linear Control; Intelligent Building; Constant Temperature Control
{"title":"Indoor Constant Temperature Control Method of Intelligent Building Based on Bi-linear Control Algorithm","authors":"Z. Fan","doi":"10.2991/pntim-19.2019.72","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.72","url":null,"abstract":"With the continuous improvement of technological innovation in construction industry, intelligent building management on the internal environment of the building is also realized. Through the simulation analysis of the building thermal environment, comprehensive reflection on the influence characteristics of the various disturbances under the thermal inertia of the envelope structure is shown in this paper. Based on the bi-linear simulation analysis method, optimal construction method for the temperature regulation of the heat supply end in heating system is explored for the first time, and the application and effect of the optimized construction method is analyzed through specific cases. Therefore, research in this paper has strong engineering application value for optimizing the operation regulation and promoting energy saving in heating system. Keywords-Bi-linear Control; Intelligent Building; Constant Temperature Control","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125443173","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.43
Du Xi, Fang-Ming Zhou, L. Bo, Zhang Jun-an
Laval nozzles for important component in highspeed precision air-floating spindle gas drive systems, to establish a cross-sectional ratio is calculated by analysis of their simplified model of the two stages. Use of computational fluid dynamics (CFD) to simulate the Structural parameters of Laval nozzle-pneumatic turbine and analyzed the gas flow and flow rate. The simulation results show that the airflow impinges on the turbine blades and then flows out to the surroundings. The gas flow is accelerated in the Laval nozzle, reaching a maximum at the outlet, and the dynamic pressure in the Laval nozzle is high, reaching a maximum at the nozzle outlet. The simplified Laval nozzle model meets the design requirements. Then the article analyzes the problems in the model simplification and lays the foundation for the subsequent engineering experiments Keywords-Laval Nozzle; Cross Section Ratio; CFD
{"title":"Research on Laval Nozzle and Overall Simulation Analysis Based on High Speed Precision Air Bearing Spindle Pneumatic Turbine System","authors":"Du Xi, Fang-Ming Zhou, L. Bo, Zhang Jun-an","doi":"10.2991/pntim-19.2019.43","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.43","url":null,"abstract":"Laval nozzles for important component in highspeed precision air-floating spindle gas drive systems, to establish a cross-sectional ratio is calculated by analysis of their simplified model of the two stages. Use of computational fluid dynamics (CFD) to simulate the Structural parameters of Laval nozzle-pneumatic turbine and analyzed the gas flow and flow rate. The simulation results show that the airflow impinges on the turbine blades and then flows out to the surroundings. The gas flow is accelerated in the Laval nozzle, reaching a maximum at the outlet, and the dynamic pressure in the Laval nozzle is high, reaching a maximum at the nozzle outlet. The simplified Laval nozzle model meets the design requirements. Then the article analyzes the problems in the model simplification and lays the foundation for the subsequent engineering experiments Keywords-Laval Nozzle; Cross Section Ratio; CFD","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122422075","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.32
Wang Zhijie, Cao Yan, Yao Hui
Micro integral impeller is the key component of micro aero-engine, and its machining quality will directly affect the performance of micro-engine. Aiming at the narrow flow path of the tiny integral blade, the large distortion of the blade and the large ratio of free-form surface and divided into main and double blades, the five-axis NC machining method of the micro-integral impeller is studied in this paper. The research on the five-axis NC machining method of the microintegrated impeller is carried out. Firstly, according to the structural characteristics of the micro integral impeller, the NC programming is carried out in Siemens NX software, and the obtained tool path is verified by 2D dynamic simulation and 3D dynamic simulation. Finally, the micro integral impeller is obtained through the milling test. There are no interference, overcutting, undercutting and other problems in the machining process. Thus, the correctness of the machining technology and machining method is verified. Keywords-Micro Integral Impeller; NC Programming; FiveAxis Machining; Virtual Simulation
{"title":"Research on Five-Axis Numerical Control Programming and Machining Technology of Micro Integral Impeller","authors":"Wang Zhijie, Cao Yan, Yao Hui","doi":"10.2991/pntim-19.2019.32","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.32","url":null,"abstract":"Micro integral impeller is the key component of micro aero-engine, and its machining quality will directly affect the performance of micro-engine. Aiming at the narrow flow path of the tiny integral blade, the large distortion of the blade and the large ratio of free-form surface and divided into main and double blades, the five-axis NC machining method of the micro-integral impeller is studied in this paper. The research on the five-axis NC machining method of the microintegrated impeller is carried out. Firstly, according to the structural characteristics of the micro integral impeller, the NC programming is carried out in Siemens NX software, and the obtained tool path is verified by 2D dynamic simulation and 3D dynamic simulation. Finally, the micro integral impeller is obtained through the milling test. There are no interference, overcutting, undercutting and other problems in the machining process. Thus, the correctness of the machining technology and machining method is verified. Keywords-Micro Integral Impeller; NC Programming; FiveAxis Machining; Virtual Simulation","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123047462","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.41
Liu Yan, Yi Huahui, Zhang Ruijie
{"title":"Design and Simulation of Adjustable Jig for Shaft Hole Parts","authors":"Liu Yan, Yi Huahui, Zhang Ruijie","doi":"10.2991/pntim-19.2019.41","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.41","url":null,"abstract":"","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129491281","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}
Since the concept of knowledge map was introduced, the internet has gradually changed from hyperlink between web pages to describing the association between entities.Knowledge map is mainly used in personalized recommendation and other fields. It can provide users with knowledge nodes and links between nodes.In order to make personalized recommendation for each user's interests and hobbies, based on magnetic material knowledge map and collaborative filtering algorithm, this paper uses python language to mine the interests and hobbies of potential customers. through mining, summarizing, sorting and indepth analysis of user data, combining the weight of time data and the weight of information similarity, this paper constructs the knowledge map architecture of magnetic material products, realizes the application of process and recommendation algorithm, and proposes the personalized recommendation system architecture of magnetic material retrieval based on knowledge map, which provides a technical scheme for the establishment of personalized learning resource recommendation system. Keywords-Magnetic Material; Knowledge Map; Personalized
{"title":"Research on Personalized Recommendation of Magnetic Material Retrieval Based on Knowledge Mapping","authors":"Li Lei, Bai Yu","doi":"10.2991/pntim-19.2019.6","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.6","url":null,"abstract":"Since the concept of knowledge map was introduced, the internet has gradually changed from hyperlink between web pages to describing the association between entities.Knowledge map is mainly used in personalized recommendation and other fields. It can provide users with knowledge nodes and links between nodes.In order to make personalized recommendation for each user's interests and hobbies, based on magnetic material knowledge map and collaborative filtering algorithm, this paper uses python language to mine the interests and hobbies of potential customers. through mining, summarizing, sorting and indepth analysis of user data, combining the weight of time data and the weight of information similarity, this paper constructs the knowledge map architecture of magnetic material products, realizes the application of process and recommendation algorithm, and proposes the personalized recommendation system architecture of magnetic material retrieval based on knowledge map, which provides a technical scheme for the establishment of personalized learning resource recommendation system. Keywords-Magnetic Material; Knowledge Map; Personalized","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"244 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133684308","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.96
Li Hongke, Wang Ke, Lai Xiaowen
When there are faults in AC grid, one of the concerns is power distribution as well as system stable operation while AC grid in fixed DC voltage side goes wrong. The second point of concern is power distribution of other converter stations while certain converter station fails. Moreover, based on VSC-MTDC system balance control strategy with additional active power signal, power distribution and DC voltage control which are performed when DC voltage station fails are realized through introducing additional active power signal based on adjustable active capacity margin at fixed active power converter station so that stable operation in VSC-MTDC system can be enhanced during faults. Keywords-Multi-Terminal Flexibility; DC Transmission; Power Redistribution
{"title":"Redistribution of DC Power in Multi-terminal Flexible DC Transmission Systems","authors":"Li Hongke, Wang Ke, Lai Xiaowen","doi":"10.2991/pntim-19.2019.96","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.96","url":null,"abstract":"When there are faults in AC grid, one of the concerns is power distribution as well as system stable operation while AC grid in fixed DC voltage side goes wrong. The second point of concern is power distribution of other converter stations while certain converter station fails. Moreover, based on VSC-MTDC system balance control strategy with additional active power signal, power distribution and DC voltage control which are performed when DC voltage station fails are realized through introducing additional active power signal based on adjustable active capacity margin at fixed active power converter station so that stable operation in VSC-MTDC system can be enhanced during faults. Keywords-Multi-Terminal Flexibility; DC Transmission; Power Redistribution","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133407606","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.50
Liu Changke, Shang Yaceng, Lai Hao, Sun Kaidong
Foreign object detection is an important issue that restricts the development of wireless charging for electric vehicles. When foreign matter enters the charging area during charging, the impedance of the charging coil changes. According to this principle, the result shows that the higher the coil excitation frequency, the more obvious the coil impedance changes. In order to carry out accurate foreign object detection while charging, this paper proposes a dual-frequency inductive charging method. The high frequency is used for foreign object detection, the low frequency is used for wireless charging, the power supply topology and design method are given, and the simulation is verified. Keywords-Wireless Charging; Dual-Frequency; Foreign Object Detection
{"title":"Research on Foreign Object Detection Technology in Wireless Charging System for Electric Vehicles","authors":"Liu Changke, Shang Yaceng, Lai Hao, Sun Kaidong","doi":"10.2991/pntim-19.2019.50","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.50","url":null,"abstract":"Foreign object detection is an important issue that restricts the development of wireless charging for electric vehicles. When foreign matter enters the charging area during charging, the impedance of the charging coil changes. According to this principle, the result shows that the higher the coil excitation frequency, the more obvious the coil impedance changes. In order to carry out accurate foreign object detection while charging, this paper proposes a dual-frequency inductive charging method. The high frequency is used for foreign object detection, the low frequency is used for wireless charging, the power supply topology and design method are given, and the simulation is verified. Keywords-Wireless Charging; Dual-Frequency; Foreign Object Detection","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122090567","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 : 2019-11-01DOI: 10.2991/pntim-19.2019.74
Z. Fan
In recent years, photo voltaic industry has achieved rapid development, and the investment in large-scale photo voltaic power plants has eased the supply of electricity in more information-poor regions. There are intelligent control methods in high-power solar power systems where solar position tracking technology and plays an vital role. Based on the sun position tracking technology, the tracking error model in the sun positioning is established to analyze the error precision of the tracking algorithm, and the algorithm compensation factor is optimized to obtain the best positioning tracking effect in this paper. Moreover, the research on the compensation analysis of the photo voltaic tracking bracket error provides a guarantee for the power generation efficiency of the photo voltaic power station. Keywords-Solar Bracket; Error Model; Tracking Compensation
{"title":"Research on Compensation of Solar Bracket Tracking Based on Error Model","authors":"Z. Fan","doi":"10.2991/pntim-19.2019.74","DOIUrl":"https://doi.org/10.2991/pntim-19.2019.74","url":null,"abstract":"In recent years, photo voltaic industry has achieved rapid development, and the investment in large-scale photo voltaic power plants has eased the supply of electricity in more information-poor regions. There are intelligent control methods in high-power solar power systems where solar position tracking technology and plays an vital role. Based on the sun position tracking technology, the tracking error model in the sun positioning is established to analyze the error precision of the tracking algorithm, and the algorithm compensation factor is optimized to obtain the best positioning tracking effect in this paper. Moreover, the research on the compensation analysis of the photo voltaic tracking bracket error provides a guarantee for the power generation efficiency of the photo voltaic power station. Keywords-Solar Bracket; Error Model; Tracking Compensation","PeriodicalId":344913,"journal":{"name":"Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019)","volume":"421 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127727433","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：