发布求助
文献互助 智能选刊 最新文献

2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)最新文献

筛选
英文 中文
Wind-PV based Isolated Hybrid Generation for Smart Irrigation Management and Supplying other Critical Loads 基于风能-光伏的隔离混合发电用于智能灌溉管理和供应其他关键负荷
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9908711
A. Chatterjee, Soumyajit Ghosh, Arindam Mitra
{"title":"Wind-PV based Isolated Hybrid Generation for Smart Irrigation Management and Supplying other Critical Loads","authors":"A. Chatterjee, Soumyajit Ghosh, Arindam Mitra","doi":"10.1109/SeFeT55524.2022.9908711","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9908711","url":null,"abstract":"Wind and solar hybrid generation is now being used as a prospective generation scheme especially for remote and grid isolated areas. This paper presents an analysis of wind-photovoltaic (PV) hybrid generation scheme to be used in isolation from the grid for managing irrigation and supplying some other critical loads. The proposed generation scheme can be used to generate power with varying wind speeds. The load voltage will be maintained using availability of power from wind or PV sources. The proposed scheme can be installed in a hilly region or in any onshore areas which is isolated from the grid. The proposed scheme is also flexible to be connected to grid if required. The control is done using a smart controller. The simulation and experimental results validate that the proposed hybrid generation can be suitably used, installed and employed for isolated power generation effectively especially for irrigation management.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125011338","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: 1
HESS-Based Bi-Directional DC-DC Converter with Adaptive Control Strategy 基于hess的双向DC-DC变换器及其自适应控制策略
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909383
Srinivas Punna, Sujatha Banka, Kavya Swamy, K. Keerthi Krishna, P. Sreeja Sree, D. Tharuni
{"title":"HESS-Based Bi-Directional DC-DC Converter with Adaptive Control Strategy","authors":"Srinivas Punna, Sujatha Banka, Kavya Swamy, K. Keerthi Krishna, P. Sreeja Sree, D. Tharuni","doi":"10.1109/SeFeT55524.2022.9909383","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909383","url":null,"abstract":"In systems like electric/hybrid vehicles and islanded DC microgrids, hybrid energy storage system (HESS) technologies are employed to augment the batteries. In case of a DC microgrid, the flow of energy between the source and the load must be balanced so as to take care of a relentless DC grid voltage. Energy storage is utilized to balance out any imbalances between the source and the load. To control the imbalance power, supercapacitor and battery-based combination storage is the best solution among all hybrid energy storage systems. This paper presents the HESS modelling, design of bidirectional converter, controller design, stability analysis and simulation as well as experimental findings for a step change in PV generation and load demand are presented. The outcomes of the study of the conventional control scheme along with the proposed control scheme were included.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130568477","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
A New Inverter Topology to Improve the Performance of Pole-phase Modulated Induction Motor Drive by Minimizing Circulating/Common Mode Currents 一种新的逆变器拓扑结构，通过最小化循环/共模电流来提高极相调制感应电机驱动的性能
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9908967
S. V. S. Phani Kumar Ch, V. Sonti, Sachin Jain
{"title":"A New Inverter Topology to Improve the Performance of Pole-phase Modulated Induction Motor Drive by Minimizing Circulating/Common Mode Currents","authors":"S. V. S. Phani Kumar Ch, V. Sonti, Sachin Jain","doi":"10.1109/SeFeT55524.2022.9908967","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9908967","url":null,"abstract":"The paper gives an new inverter topology to improve the performance of pole-phase modulated induction motor drive (PPM-IMD) by minimizing circulating/common mode currents. The pole phase modulation technique usually gives wide speed-torque ranges and operation to IMD. Specifically, the PPM technique operates the IMD in wide pole ranges i.e., from high-pole to low-pole mode. However, especially in high-pole operation there exists high torque ripples. The torque ripples are due to by reason high-space harmonics in stator winding. The harmonics are attributable to the circulating currents/common mode currents (CMC). The CMC are resultant of inverter common mode voltage (CMV). The proposed inverter topology minimizes the CMV by decoupling the DC bus and load during active high states of the switches. The paper mainly concentrates on the 3-phase mode CMV minimization. The proposed inverter topology minimizes the transition that comes due to switch junction capacitance effect. The minimization in CMV improves the drive performance by minimizing the torque ripple in high-pole mode. In addition, the proposed topology minimizes the switch losses as all switches in the inverter are turned ‘on’ during DC-decoupling/freewheeling period. The ANSYS designed 3HP, 415V, 12-pole IMD is exported to Ansys Twin-Builder environment and results are presented for proposed inverter topology. The simulation results validate the minimization of CMV and improvement in the drive performance by the proposed new inverter topology.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122250719","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
Protection of microgrids using Resistive Type Superconducting Fault Current limiter(RSFCL) 电阻式超导故障限流器对微电网的保护
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909066
M. M. Rao, D. S. M. Rao, C. Reddy
{"title":"Protection of microgrids using Resistive Type Superconducting Fault Current limiter(RSFCL)","authors":"M. M. Rao, D. S. M. Rao, C. Reddy","doi":"10.1109/SeFeT55524.2022.9909066","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909066","url":null,"abstract":"Microgrid protection is one of the challenging tasks, now a day microgrids placed an important role. In general, some conventional protective devices (Circuit breaker and relays, etc.) are there for the protection of microgrids. These conventional protective devices having some drawbacks, they are during abnormal conditions continuity of supply is not possible and it permits up to three cycles of error currents into the network. To overcome that disadvantages Superconducting Fault Current Limiter (Resistive type) is used. Under standard conditions R-SFCL offers small resistance then it acted as a superconductor, under fault circumstances it offers more resistance then error currents are minimized. It allows only one cycle of fault current into the system and continuity of supply is possible.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126812816","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
Synchronization and Power Quality Improvement of 2SPV-BES Based Microgrid 基于2SPV-BES的微电网同步与电能质量改善
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9908880
S. Roy, Farheen Chishti, Bhim Singh, B. K. Panigrahi
{"title":"Synchronization and Power Quality Improvement of 2SPV-BES Based Microgrid","authors":"S. Roy, Farheen Chishti, Bhim Singh, B. K. Panigrahi","doi":"10.1109/SeFeT55524.2022.9908880","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9908880","url":null,"abstract":"This paper deals with the control and synchronization of double-stage solar photovoltaic (2SPV)-battery energy storage (BES) based three phase microgrid. The modified damped second order generalized integrator (MDSOGI) current control algorithm is used to feed power to the grid and at the same time it is used to provide phase angle and frequency estimation for the purpose of synchronization. MDSOGI is a modified version of the damped-SOGI structure, where frequency is estimated by integrating a frequency locked-loop (FLL) algorithm that utilizes the quadrature shifted components of the DSOGI structure. It has better power quality (PQ) performance, enhanced load balancing ability, effective harmonic mitigation property due to the band-pass-filter type phase response of the SOGI structure and is robust during frequency deviations. MDSOGI is used to extract the active and reactive fundamental weight components for generation of reference grid currents. Thus, the current control also meets the reactive power demand at common coupling point (CCP). In islanded mode of operation, voltage control mode is utilized and the MDSOGIFLL with the help of phase angle regulator is used to generate local frequency. This system is simulated in SIMULINK/Matlab R2020b and is subjected to various dynamic conditions for validating the satisfactory performance. Total harmonic distortion (THD) is found well within the IEEE-519 standard.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"os-28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127865594","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
SensorLess Technique For Rotor Position Detection of An Permanent Magnet Synchronous Machine Using DirectTorque Control 永磁同步电机直接转矩无传感器转子位置检测技术
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909006
Srinivas Kamera, Jayanth Kumar Daida
{"title":"SensorLess Technique For Rotor Position Detection of An Permanent Magnet Synchronous Machine Using DirectTorque Control","authors":"Srinivas Kamera, Jayanth Kumar Daida","doi":"10.1109/SeFeT55524.2022.9909006","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909006","url":null,"abstract":"Double-excited AC machines, such as PMSMs, provide fast torque responses and great operating performance. Permanent magnet synchronous motors have an increase in electromagnetic torque that can be demonstrated analytically. Direct Torque Control (DTC) adjusts the angle between the stator and rotor flux connections to achieve rapid torque response. Electrical torque is calculated in a stationary reference frame using DTC’s calculations for electromagnetic torque. Stator flux and torque are variables. There are a variety of techniques for determining the rotor’s location and speed without the use of sensors. As an improvement on standard DTC, a sensor-less approach for detecting rotor position and performing direct torque control will be discussed in this work. MATLAB findings are used to model the sensorless direct torque control technique’s fundamental operation.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117212809","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
A Multi-Level Converter for SRM Drive Based EV Applications with Auxiliary Load Driving Capability 具有辅助负载驱动能力的基于SRM驱动的电动汽车应用的多电平变换器
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909185
Vaibhav Shah, S. Payami
{"title":"A Multi-Level Converter for SRM Drive Based EV Applications with Auxiliary Load Driving Capability","authors":"Vaibhav Shah, S. Payami","doi":"10.1109/SeFeT55524.2022.9909185","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909185","url":null,"abstract":"This article proposes a multi-level converter topology (MLCT) for a four-phase switched reluctance machine (SRM) drive-based electric vehicle (EV) application with auxiliary load driving capability. The proposed MLCT employs the same number of devices as in the conventional three-level-asymmetrical half-bridge (CTL-AHB) converter. The DC-link in the proposed MLCT topology is connected in series with an active boosting source, i.e., battery, via a bi-directional DC-DC converter to achieve higher voltage levels. The higher voltage levels result in faster energization and de-energization of the phase currents, resulting in improved average torque output. The proposed MLCT provides continuous power to the auxiliary loads for EV applications via a series battery. Depending on the series battery voltage/state of charge, the operating modes of the converter allow its charging via three modes. Analysis of different operating modes under motoring and regeneration/ braking is discussed with the simulation and experimental validation of the same.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132736589","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
Design of IMC Based PI Controllers for Three Tank Interacting Level Control Process 基于IMC的三槽交互液位控制过程PI控制器设计
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9908684
B. Sharmila, Y. Dharshan, D. Devasena, S. Kaushik, K. Srinivasan
{"title":"Design of IMC Based PI Controllers for Three Tank Interacting Level Control Process","authors":"B. Sharmila, Y. Dharshan, D. Devasena, S. Kaushik, K. Srinivasan","doi":"10.1109/SeFeT55524.2022.9908684","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9908684","url":null,"abstract":"India is a country that consists of most process industries, where most of the end products are related to water or other liquid state materials. In recent days pharmaceutical industries have grown on a larger scale due to the COVID’19 situation. One of the major processes is to maintain the level of the liquid for having a continuous process. In this proposed process, Proportional Integral (PI), Internal Model Controller (IMC) based PI is implemented on a three-tank integrating system with two input and two output (TITO). IMC-PI gain values are acquired and decoupled using the decoupler matrix by determining RHP poles and zeros for the TITO system. Since two input tanks are involved, therefore two different gain values are calculated keep the liquid at the given level. The proposed system has given has resulted with 180 seconds and 190 seconds for Settling time and 5% and 0% of Overshoot for two tanks.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128454613","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
Open circuit Fault Diagnosis using Machine Learning Classifiers 利用机器学习分类器进行开路故障诊断
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909053
S. Reddy, P. B. Bobba, S. Akundi, Vinay Seshu Neelam, A. Jangam, Krishna Tej Chinta, Bharath Babu Ambati
{"title":"Open circuit Fault Diagnosis using Machine Learning Classifiers","authors":"S. Reddy, P. B. Bobba, S. Akundi, Vinay Seshu Neelam, A. Jangam, Krishna Tej Chinta, Bharath Babu Ambati","doi":"10.1109/SeFeT55524.2022.9909053","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909053","url":null,"abstract":"Power electronic devices plays major role in controlling and improving the drive system. because of the robustness, good performance and solidness of an induction motor it is highly recommended for the industrial application. In order to obtain better performance from this kind of motors we use converters to control the motor with input parameters. But when we use the power electronic elements there is high chance of failure of this elements. This failure may lead to short-circuit fault, open-circuit fault and many other which may occur in DC link in converter of drive system. Short-circuit faults in converters will make big differences in every parameter and we have our normal conventional methods to deal with it. But open-circuit faults make system run at low efficiency and these faults are unable to find immediately. Neglecting these kinds of faults may lead to damage the other elements in the system. So, in this paper diagnosis models for the open-circuit faults in inverter fed induction motor using machine learning models and multilayer perceptron classifier is presented. In this model RMS currents and RMS voltages of each phase have been considered as a feature by which models have been trained and also valid simulation test results provided.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134640715","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
Remote Electric Vehicle Battery Monitoring & Life Cycle Management System 电动汽车电池远程监测与生命周期管理系统
2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT) Pub Date : 2022-08-04 DOI: 10.1109/SeFeT55524.2022.9909384
Sangeetha R.G., H. C, Naveenkumar Marati
{"title":"Remote Electric Vehicle Battery Monitoring & Life Cycle Management System","authors":"Sangeetha R.G., H. C, Naveenkumar Marati","doi":"10.1109/SeFeT55524.2022.9909384","DOIUrl":"https://doi.org/10.1109/SeFeT55524.2022.9909384","url":null,"abstract":"The Internet of things (IoT) is one of the most revolutionary technologies leading experts have created today. The ever-increasing number of devices and embedded systems has made it a necessity for IoT to be implemented in every corner of the world. The latest technology for electric vehicles uses IoT monitoring and life cycle management. Even though there is a sophisticated battery management system in the present Electric Vehicles, there is always a chance of battery damage due to numerous instances caused by battery overcharge and exposure to high/low temperatures. It may prevent battery damage if the battery level is indicated well in advance, similar to “reserve” in the petrol car. In this paper, battery monitoring is implemented using IoT and MQTT protocol based on the battery levels, and the navigation to the nearest available charging station is also displayed.","PeriodicalId":262863,"journal":{"name":"2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134418960","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：481959085
Book学术官方微信