发布求助
文献互助 智能选刊 最新文献

2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)最新文献

筛选
英文 中文
Research on the Influences of Temperature on Frequency Domain Dielectric Spectroscopy of the ERIP Bushing Capacitor Core 温度对ERIP套管电容器铁芯频域介电光谱影响的研究
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708357
Tai-Hung Liu, Xiongjie Xie, Xiaoqing Luo, Wei Hu, Zuoming Xu, P. Yin, Qiming Ye
{"title":"Research on the Influences of Temperature on Frequency Domain Dielectric Spectroscopy of the ERIP Bushing Capacitor Core","authors":"Tai-Hung Liu, Xiongjie Xie, Xiaoqing Luo, Wei Hu, Zuoming Xu, P. Yin, Qiming Ye","doi":"10.1109/AEERO52475.2021.9708357","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708357","url":null,"abstract":"Epoxy resin impregnated paper (ERIP) bushing capacitor core is one of the main insulation part of the capacitance graded bushing. The insulating property of the ERIP bushing capacitor core is influenced by the temperature in the actual operation environmental. In order to explore the influence of temperature on frequency dielectric response of the ERIP bushing capacitor core, the frequency domain dielectric spectroscopy (FDS) is utilized for ERIP bushing capacitor core at different temperature, then a double relaxation Debye model is proposed in the paper. Firstly, the temperature experiment of ERIP bushing capacitor core is carried out, and the FDS test is performed on the bushing core at 20°C, 40°C, 60°C, 80°C and 100°C, respectively. Secondly, the FDS spectrum of the dielectric loss factor (tanδ) and the real and imaginary parts of the complex capacitance are plotted at different temperature. Finally, the influences of temperature on FDS test of ERIP bushing capacitor core are analyzed based on a double relaxation Debye model. The test results and analysis indicated that the entire spectrum of tanδ, the imaginary part of the complex capacitance are shown to shift toward the positive vertical direction and move to the high frequency. A good fitness result is obtained by the double relaxation Debye model, and the degree of fit on the data exceeds 90%. The high-frequency dielectric constant, interfacial polarization loss and dipole polarization loss can be made up for the real part of the complex capacitance. These conclusions can provide a mathematical model for the ERIP bushing capacitor core, which will be supportive for ageing state of bushing core insulation.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"58 4 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90372938","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}
引用次数: 0
Research on ultrasonic array positioning of Partial Discharge in GIS based on Incoherent Signal Subspace Method 基于非相干信号子空间法的GIS局部放电超声阵列定位研究
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708338
Long Li, Hua Yin, Wenbin Zhao, Zhimin Wu
{"title":"Research on ultrasonic array positioning of Partial Discharge in GIS based on Incoherent Signal Subspace Method","authors":"Long Li, Hua Yin, Wenbin Zhao, Zhimin Wu","doi":"10.1109/AEERO52475.2021.9708338","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708338","url":null,"abstract":"Partial discharge is the main reason of insulation aging of GIS equipment. It is very important to find and locate the location of partial discharge for safe operation of GIS equipment. In this paper, we use an array of $2 times 3$ approximate planes, and the detected data is denoised by sparse decomposition theory. According to the waveform comparison before and after denoising, the output signal-to-noise ratio of each array element is significantly improved compared with the input signal-to-noise ratio. Then the Incoherent Signal Subspace Method (ISM) algorithm is used for simulation, the analysis results show that the original data is de-noising, and then the Incoherent Signal Subspace Method (ISM) is used for simulation, which shows that the direction finding spectrum peak is concentrated and sharp after de-noising, and the direction finding effect has been improved to a certain extent.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"60 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84928776","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}
引用次数: 0
Heat and Moisture Coupling for HVAC Tunnel Cable 暖通空调隧道电缆的热湿耦合
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708248
Ziqi Lin, Hua Bao, Qiuqin Sun, Tangsheng Yang, Rui Wu, Jie Chen
{"title":"Heat and Moisture Coupling for HVAC Tunnel Cable","authors":"Ziqi Lin, Hua Bao, Qiuqin Sun, Tangsheng Yang, Rui Wu, Jie Chen","doi":"10.1109/AEERO52475.2021.9708248","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708248","url":null,"abstract":"The ampacity of tunnel cable is heavily dependent on the capacity to diffuse heat into surrounding air. This ability is significantly influenced by wet conditions. Based on the finite element method (FEM), a 3D model of high voltage alternating current (HVAC) tunnel cable is developed, coupling heat and moisture transfer. The thermal properties of air are changing with relative humidity and temperature. Latent heat of evaporation is included. Thermal analysis is conducted by recording the cable maximum temperature as a function of time and relative humidity. Temperature gradient exists not only radially, but also circumferentially and longitudinally.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"32 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81913733","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}
引用次数: 0
Fault Diagnosis of High-Voltage Circuit Breaker Based on Digital Twin 基于数字孪生的高压断路器故障诊断
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708367
Yunyi Zhu, Z. Qian, Shuai Yuan, Hao Yu
{"title":"Fault Diagnosis of High-Voltage Circuit Breaker Based on Digital Twin","authors":"Yunyi Zhu, Z. Qian, Shuai Yuan, Hao Yu","doi":"10.1109/AEERO52475.2021.9708367","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708367","url":null,"abstract":"High-voltage circuit breaker is one of the key components in the power grid, and mechanical faults often occur during long-time operation. A method based on digital twin for mechanical fault diagnosis of high-voltage circuit breaker is proposed in this paper. First, a finite element twin model is established to simulate the opening and closing operation of high-voltage circuit breaker to simulate its typical coil currents, then measured coil currents are obtained from the actual circuit breaker. Both the virtual data and measured data are utilized to train the KNN model to perform the fault diagnosis of five operation states. Experimental results show that the proposed digital twin method can simulate the operation of high-voltage circuit breaker, provide more failure types of data and can efficaciously diagnose mechanical faults with a high classification accuracy.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"10 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80336591","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}
引用次数: 3
Research on the extraction method of high-voltage circuit breaker vibration signal based on IVMD 基于IVMD的高压断路器振动信号提取方法研究
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708267
Lei Mu, Zhe Sun, Yi Zhao, Ning Wei, Yang Wang, Chenlei Liu
{"title":"Research on the extraction method of high-voltage circuit breaker vibration signal based on IVMD","authors":"Lei Mu, Zhe Sun, Yi Zhao, Ning Wei, Yang Wang, Chenlei Liu","doi":"10.1109/AEERO52475.2021.9708267","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708267","url":null,"abstract":"The vibration of the high-voltage circuit breaker operating mechanism can indirectly reflect its mechanical motion state. In order to effectively extract the vibration signal characteristic quantity, the vibration signal of the circuit breaker is firstly analyzed theoretically as a series of simple harmonic superposition formation. For the characteristics of randomness and non-smoothness of the vibration signal, VMD (Variational Mode Decomposition) is recommended for calculation and analysis. The concept of quality factor is introduced to optimize the VMD. Finally, via the comparison of example simulation, IVMD can separate each component mode of the vibration signal effectively, which can solve the decomposition modal overlap problem of EMD.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"10 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79479523","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}
引用次数: 0
Distributed Cooperative Secondary Control With Vitual Impedance for Islanded Microgrid 孤岛微电网虚阻抗分布式协同二次控制
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708117
Xiaotang Jin, Hui Wang, Wenzheng Zhou, Meng Zhang
{"title":"Distributed Cooperative Secondary Control With Vitual Impedance for Islanded Microgrid","authors":"Xiaotang Jin, Hui Wang, Wenzheng Zhou, Meng Zhang","doi":"10.1109/AEERO52475.2021.9708117","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708117","url":null,"abstract":"This paper presents a two-level layer control for microgrid (MG)in islanded mode. In the first level, a virtual impedance is designed based on the transfer function of the parallel inverter to correct the equivalent impedance of the inverter, with which active and reactive power can be decouped. The second level take part in power distribution and point of common coupling (PCC) voltage regulation. A PCC voltage regulation method is proposed to provides a proportionality coefficient to the reference voltage. The global positioning system (GPS) is utilized to provide the secondary compensation at the same time. The rationality of the proposed control strategy was tested by MATLAB/Simulink.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79226759","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}
引用次数: 0
Comparative Research on Discharge Gas Characteristics of Typical Defects in Pure Oil Gap 纯油间隙典型缺陷放电气体特性比较研究
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708337
Qin Liu, Tai-Hung Liu, Xiongjie Xie, Xiaoqing Luo, Wei Hu, Qiming Ye
{"title":"Comparative Research on Discharge Gas Characteristics of Typical Defects in Pure Oil Gap","authors":"Qin Liu, Tai-Hung Liu, Xiongjie Xie, Xiaoqing Luo, Wei Hu, Qiming Ye","doi":"10.1109/AEERO52475.2021.9708337","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708337","url":null,"abstract":"The oil-less equipment is internally insulated by filling with insulating oil. When a discharge or overheating failure occurs, there is a phenomenon that a large amount of H2, hydrocarbon gas, CO and CO2 and other dissolved gases can be produced because of the small internal space. These can cause a explode in severe cases, resulting a huge economical loss. Therefore, a discharge test system for oil-less equipment is designed in the paper. Firstly, the gas diffusion characteristics in the oil after discharge is obtained. Secondly, the gas production test is studied under three typical electrodes, including the plate-plate electrode, ball-ball electrode and needle-plate electrode. Finally, the data of the test is obtained ats at different gap distances and charge time. The research results show that under plate-to-plate electrode discharge, the gas produced by direct pressurization to breakdown is small. The gas production increases with the increase of the gap distance during continuous discharge. The H2 content under 6mm pitch is 9.2 times, 5.9 times and 7.6 times larger than 3mm under discharge of 5s, 10s and 15s, respectively. The C2 H2 content and H2 content of the ball electrode under 6mm pitch gradually increase with the increase of discharge time. After the gas concentration increases, the C2 H2 and H2 generated by the discharge of the ball electrode and the needle plate electrode show a saturation trend. The three electrode discharges all show the law that the gas production increases with the increase of the discharge interval and discharge time. At the same discharge time, the needle plate electrode has the largest gas production volume, followed by the ball electrode, and the plate electrode has the smallest gas production volume. The change law of the discharge gas content in three typical electrode oils is obtained in the paper. There is a great significance for the failure analysis of oil-less equipment under gas production.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"19 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77806002","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}
引用次数: 0
Development Characteristics of Partial Discharge of Basin-type Insulator for GIS Under AC Voltage 交流电压下GIS盆式绝缘子局部放电的发展特性
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708247
Xiaohua Zhang, Zhirui Lv, Bin Huang, Guangjin Zhang, Junping Zhao, Zhaowei Peng, Xinsheng Ma, Yifan Qin
{"title":"Development Characteristics of Partial Discharge of Basin-type Insulator for GIS Under AC Voltage","authors":"Xiaohua Zhang, Zhirui Lv, Bin Huang, Guangjin Zhang, Junping Zhao, Zhaowei Peng, Xinsheng Ma, Yifan Qin","doi":"10.1109/AEERO52475.2021.9708247","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708247","url":null,"abstract":"Metal particles attached to the insulator surface will seriously distort the electric field along the surface, induce partial discharge and even cause flashover, which seriously threatens the normal operation of the equipment. The detection of partial discharge is one of the important means of insulation supervision. In this paper, the experimental platform of PD photoelectric joint diagnosis was built. The development characteristics of partial discharge of 126 kV basin-type insulator for GIS under AC voltage were studied. With the increase of the applied voltage, three stages were founded from the beginning of partial discharge to the approaching flashover. When the metal particles are located at different positions of the basin-type insulator, the change trend of the discharge amount with the voltage is the same, and both show a slow increase first and then an exponential increase trend.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"5 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74250048","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}
引用次数: 0
DC Breakdown Properties and Mobility Characteristics of Different Insulation Liquids Applying in Transformer 变压器中不同绝缘液体的直流击穿特性及迁移特性
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708179
Y. Jing, Yan Luo, R. Zhuo, Zhiming Huang, M. Fu, Chuanhui Cheng, Meng Gao, Jianeng Zhao
{"title":"DC Breakdown Properties and Mobility Characteristics of Different Insulation Liquids Applying in Transformer","authors":"Y. Jing, Yan Luo, R. Zhuo, Zhiming Huang, M. Fu, Chuanhui Cheng, Meng Gao, Jianeng Zhao","doi":"10.1109/AEERO52475.2021.9708179","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708179","url":null,"abstract":"Transformer is a key component in power grid, and oil is still used widely as main insulating and cooling media because of its excellent property. Nowadays different kinds of oil get a lot of applications, including mineral oil, synthetic ester and natural ester, etc. HVDC systems and equipment require concrete information about dielectric property of insulating fluids under dc excitation. Therefore, it is vital to study the dielectric properties of dielectric liquids, and to understand their behaviour under both types of excitation. In this paper, DC breakdown voltage and apparent mobility of three kinds of oils were measured, and these results could give some reference to substitute traditional mineral oil in transformer.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"31 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75280255","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}
引用次数: 0
Influence of Temperature on the Partial Discharge Inception Characteristics of Typical Insulation-shaping Components in Transformer 温度对变压器典型绝缘成形元件局部放电起始特性的影响
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI: 10.1109/AEERO52475.2021.9708137
Haozhi Shi, Shuqi Zhang, Xinru Yu, Feiyang Su, C. Gao, B. Qi, Chengrong Li
{"title":"Influence of Temperature on the Partial Discharge Inception Characteristics of Typical Insulation-shaping Components in Transformer","authors":"Haozhi Shi, Shuqi Zhang, Xinru Yu, Feiyang Su, C. Gao, B. Qi, Chengrong Li","doi":"10.1109/AEERO52475.2021.9708137","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708137","url":null,"abstract":"In this paper, the effect of temperature on the partial discharge inception characteristics of typical insulation-shaping components is demonstrated. The partial discharge test platform was established to test the typical insulation-shaping components of three manufacturers. The products of each manufacturer were tested for the partial discharge inception voltage and magnitude at five temperatures of 20°C 35°C, 50°C, 65°C and 80°C, and their distribution figures were drawn. Based on the test results, the partial discharge inception characteristics of the insulation-shaping components of the three manufacturers were compared, and the dispersion of the product data was analyzed. According to the analysis result, it can be concluded that the partial discharge inception voltage of typical insulation-shaping components decreases with the increase of temperature, and the discharge magnitude rise with the increase of temperature, and the performance of various insulation-shaping components of each manufacturer is different.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"43 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76241570","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}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信