Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Crustal Deformation and Earthquake》 2005-01
Add to Favorite Get Latest Update

WAVELET DECOMPOSITION OF REPEATED GRAVITY DATA AND TECTONIC ACTIVITIES IN FRONT AREA OF THREE GORGES RESERVOIR

Liu Shaoming+{1,2,3)}, Shen Chongyang+{1,2,3)}, Sun Shaoan+{1,2,3)} and Chen Buyun+{1,2,3)} 1) Institute of Seismology, CEA, Wuhan 430071 2) Crustal Movement Laboratory,Wuhan 430071 3) Wuhan Base of Institute of Crustal Dynamics, CEA, Wuhan 430071  
The gravity observation data obtained from the front area of the Three Gorges reservoir since Aug. 1989 are decomposed by wavelet method. The main characters of the decomposition results are described. The decomposition results combined with the tectonic activity characters of the area are explained. The 1st order wavelet decomposition details are main part of the gravity changes in Three Gorges area, which indicates that the gravity changes in the area are mainly result from the matter density changes in the upper part of the crust. The relation between the earthquake %M%s3.7 that occurred at the right side of the gravity network in Aug. 10th, 1997 and the wavelet decomposition results of gravity changes in the area is discussed.
【Fund】: 长江三峡水库诱发地震监测研究项目;地震科学联合基金项目(602017)
【CateGory Index】: P223
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
【References】
Chinese Journal Full-text Database 2 Hits
1 Wang Dan+{1,2)}, Li Hui+{1,2)}, Shen Chongyang+{1,2)}, Fan Chunbo+{3)} and Yang Guangliang+{1,2)} 1) Institute of Seismology, CEA, Wuhan430071 2) Crustal Movement Laboratory, Wuhan430071 3) School of Geodesy and Geomatics, Wuhan University, Wuhan430071;UPWARD CONTINUATION OF GROUND GRAVITY SPACE-TIME CHANGE TO SATELLITE HEIGHT[J];Crustal Deformation and Earthquake;2005-02
2 XU Yun-ma,ZHU Yi-qing,CHENG Hong-bin,SU Rui (Second Crust Monitoring and Application Center,CEA,Xi'an 710054,Shaanxi,China);Wavelet Analysis of the Temporal Gravity Variation in Lanzhou-Tianshui-Wudu Area from 2001 to 2006[J];Journal of Seismological Research;2010-01
【Citations】
Chinese Journal Full-text Database 9 Hits
1 Fang Shengming,Zhang Xiankang,Jia Shixu,Duan Yonghong,Yang Zhuoxin and Qiu Shuyan\;(Research Center of Geophysics Exploration, CSB, Zhengzhou\ 450002);MULTIS-SCALE DECOMPOSITION OF BOUGUER GRAVITY ANOMALY AND SEISMIC ACTIVITY IN NORTH CHINA[J];Crustal Deformation and Earthquake;2002-01
2 Sun Shaoan, Xiang Aimin and Li Hui (Institute of Seismology, CSB, Wuhan\ 430071);CHANGES OF GRAVITY FIELD AND TECTONIC ACTIVITY IN FRONT REGION OF THE THREE-GORGES PROJECT[J];Crustal Deformation and Earthquake;2002-03
3 Xing Chanfei, Gong Kaihong and Du Ruilin(Institute of Seismology, CSB, Wuhan 430071);CRUSTAL DEFORMATION MONITORING NETWORK FOR THREE GORGES PROJECT ON YANGTZE RIVER[J];Crustal Deformation and Earthquake;2003-01
4 Song Zhiping 1),Wu Anxu 2),Wang Mei 3),Ni Youzhong 1) Zhu Jiamiao 1),Song Xianyue 1),Zhou Huagen 1) and Zhao Zhenlin 1) 1)Seismological Bureau of Shanghai City, Shanghai 200062 2) Seismological Bureau of Beijing City, Beijing 100081 3)Seismological Bureau of Shandong Province, Jinan 250014;APPLICATION OF WAVELET TRANSFORM TO ANALYSIS OF DIGITAL DEFORMATION DATA[J];Crustal Deformation and Earthquake;2003-04
5 Wan Yongge 1),Qi Furong 1), Meng Xiaochun 1) and Zhuang Xianhua 2) 1)College of Disaster Prevention Technology,CSB,Beijing 101601) 2)Middle School of Guantao County,Hebei Province,Handan 057750;WAVELET ANALYSIS OF SEISMIC DATA IN CHINESE MAINLAND AND NORTH CHINA[J];Crustal Deformation and Earthquake;2003-04
6 Zhang Yan 1),Wu Yun 1),Liu Yongqi 2),Chu Yonghai 2) and Shi Shunying 1) 1)Institute of Seismology,CSB,Wuhan 430071 2)Wuhan University,Wuhan 430072;IDENTIFICATION AND EXTRACTION OF EARTHQUAKE PRECURSOR FROM TIDAL DEFORMATION DATA[J];Crustal Deformation and Earthquake;2003-04
7 Liu Shaoming1,2), Shen Chongyang1,2), Sun Shaoan1,2) and Chen Buyun1,2) 1)Institute of Seismology, CEA, Wuhan 4300712)Wuhan Base of the Institute of Crustal Dynamics,CEA,Wuhan 430071;ANALYSIS OF CHARACTERISTICS OF WAVELET MULTI-SCALE DECOMPOSITION[J];Crustal Deformation and Earthquake;2004-02
8 HOU ZUN-ZE; YANG WEN-CAI(Institute of Geophysical and Geochemical Exploration,MGMR, Langfang 10284, China);WAVELET TRANSFORM AND MULTI-SCALE ANALYSIS ON GRAVITY ANOMALIES OF CHINA[J];Chinese Journal of Geophysics;1997-01
9 Jia Minyu Zhan Jiehui(Institute of Seismology, China Seismological Bureau, Wuhan 430071, China);THE STRUCTURE AND ABILITY OF THE CHINA SEISMOLO-GICAL GRAVITY MONITORING SYSTEM[J];ACTA SEISMOLOGICA SINICA;2000-04
【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 Wu Shuren 1) , Hu Daogong 1) , Shi Ling 1) , Xie Guanglin 2) Wang Huabin 3) , Yi Shunhua 3) , Xu Ruichun 4) , Mei Yingtang 4) ( 1)Institute of Geomechanics,CAGS,Beijing 100081;2)Institute of Seismology,State Seismologic;SEGMENTATION,FRACTAL DIMENSION AND EARTHQUAKE ACTIVITY OF THE MAIN ACTIVE FAULTS IN THE LOW QINGJIANG RIVER OF WESTERN HUBEI PROVINCE[J];JOURNAL OF CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY;1999-03
2 WU Shu_ren 1, HU Dao_gong 1,XU Rui_chun 2, MEI Ying_tang 2, YI Shun_hua 3, WANG Hua_bin 3, JIAN Wen_xing 3 (1.Institute of Geomechanics, CAGS,Beijing 100081, China;2.Survey Institute of the Three Gorges, the Yangtze River Water Conservancy Com;SEGMENT STRUCTURE AND DYNAMIC ANALYSIS OF THE ENSHI FAULT IN THE WESTERN HUBEI PROVINCE[J];JOURNAL OF CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY;2000-03
3 FANG Dong-hong1,ZENG Zhao-fa1,CHEN Jia-lin21.College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China2.Survey of Regional Geology and Mineral Resources of Jilin Province,Changchun 130022,China;The Derivatives Calculation Based on Wavelet Analysis of G/M Data and Its Application[J];Journal of Jilin University(Earth Science Edition);2008-06
4 WANG Zhu-wen1,DING Yang1,LIU Jing-hua1,TIAN Gang21.College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China2.Department of Geological Science,Zhejiang University,Hangzhou 310027,China;Influence Factors Analyzing and Data Processing of γ-Ray Spectrometry for Liangzhu Ancient Ruins Detection[J];Journal of Jilin University(Earth Science Edition);2010-02
5 GUO Ying-qi1,2,SHI Da-qi3,HUANG Sheng-xiang2,ZHANG Wei-cheng1(1.Dept.of Surveying and Mapping Engineering,Heilongjiang Institute of Technology,Harbin 150050,China;2.School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;3.Institute of Application Technology,Jilin University,Changchun 130022,China);Application summary of wavelet analysis in high-precision GPS surveying[J];Engineering of Surveying and Mapping;2009-03
6 ZOU Zhengbo1,2,3,LUO Zhicai1,WU Haibo2,SHEN Chongyang 2,3,LI Hui2,3 1.School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;2.Institute of Seismology,CEA,Wuhan 430071,China;3.Crustal Movement Laboratory,Wuhan 430071,China;Gravity Changes Observed by GRACE before the Japan M_W9.0 Earthquake[J];Acta Geodaetica et Cartographica Sinica;2012-02
7 ZHANG Hong and WU Yangang College of Geo-Exploration Science and Technology,Jilin University,Changchun 130026,China;Application of wavelet packet in gravity anomaly processing[J];世界地质(英文版);2012-02
8 WU An-xu,LI Ping-an,LU Ya-jun,MU Hui-yong(Earthquake Administration of Beijing Municipality,Beijing 100080,China);DEFORMATION SIGNAL FILTERING PROCESSING AND ABNORMITY PICKED-UP BASED ON EMPIRICAL MODE DECOMPOSITION[J];Seismological Research of Northeast China;2006-03
9 SHI Wei(Earthquake Administration of Heilongjiang province,Heilongjiang Haerbin 150090,China);APPLYING THE WAVELET TRANSFORM TO REVEL THE ANOMALOUS INFORMATION BEFOR LINDIAN M_S5.1 EARTHQUAKE[J];Seismological Research of Northeast China;2006-03
10 JIA Xiao-dong1,LI Hai-lin1,LI Jun2(1.Earthquake Administration of Liaoning Province,Liaoning Shenyang 110031,China;2.Shen yang Seismic Station,Liaoning Shenyang,110000,China);APPLICATION OF WAVELET TRANSFORM METHOD TO THE CROSS-FAULT DEFORMATION DATA IN LIAONING[J];Seismological Research of Northeast China;2008-03
China Proceedings of conference Full-text Database 10 Hits
1 LI Zhi-hua~1,LIU Xing-ping~2,ZHANG Ling-ling~3 (1.Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China;2.The Geosciences Team in the Northeastern Hubei Province,Xiaogan 432100, China; 3.Inner Mongolia University for Nationalities,Tongliao 028043,China);APPLYING 2D DISCRETE WAVELET TRANSFORM IN MAGNETIC DATA PROCESSING[A];[C];2010
2 HUANG Song~1,HAO Tian-Yao~1,XU Ya~1,WANG Bei-Bei~2 1 Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China 2 China National Offshore Oil Corporation Limited Research Center,Beijing 100027,China;Study on macro distribution of residual basin of South Yellow Sea[A];[C];2011
3 SUN Shaoan SHEN Chongyang XIANG Aiming LIU Dongzhi Institute of Seismology, CSB, Wuhan 430071;Gravity Changes During First Water Inpouring in the Reservoir of Three Gorges[A];[C];2004
4 YANG Wencai HOU Zunze CHEN Zhengyan Institute of Geology, CAGS, Beijing 100037;Multi-scale Wavelet Analysis of Gravity Anomalies and Lithospheric Divisions in Dabie-Sulu Orogenic Belt[A];[C];2004
5 LIU Dongzhi LI Shude LI Jiaming WANG Xiaoquan YU Jielin LI Hui Institute of Seismology, China Seismological Bureau, Wuhan 430071;Digital Gravity Continuous Observation System with LCR-G Gravimeter[A];[C];2004
6 QIAO Xuejun YOU Xinzhao DU Ruilin WANG Qi 1 Seismological Institute, Chinese Seismological Bureau, Wuhan 430071 2 Institute of Crustal stresss, Chinese Seismological Bureau, Wuhan 430071 3 Center of Analysis and Prediction, Chinese Seismological Bureau, Beijing 100036;Crustal Deformation and Modeling Analysis of Three Gorges Reservoir Induced by Water Loads[A];[C];2004
7 LI Shu - ling, SUN Chang - hong, MENG Xiao - hong (China University of Geosciences, Beijing 100083);PROGRESS IN RESEARCH ON WAVELET ANALYSIS FOR GEO - POTENTIAL FIELD[A];[C];2005
8 ZHANG Xian ZHAO Li (Geophysical Exploration Center,China Earthquake Administration,Zhengzhou 450002,China);AN ANALYSIS OF THE POWER SPECTRUM FOR COMPUTING FIELD SOURCE DEPTHS OF MAGNETIC BODIES OF DIFFERENT SCALES[A];[C];2007
9 ZHOU Gong-wei1, ZHANG Bo-ming1, WU Zhong-liang1,WAN Yong-ge2, HUANG Wen-hui3(1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2. Institute of Disaster Prevention Science and Technology,Hebei 065201,China; 3. Earthquake Administration of Guangdong Province, Guangzhou 510070, China);Recent development in China digital seismograph network (CDSN)[A];[C];2007
10 HOU Zun-Ze (Chinese People's Armed Police Force Academy,Langfang 065000);Wavelet Analysis For The East China Sea Gravity Field[A];[C];2009
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 GUO Ke, NI Xiu-jing, XU Qiang(College of Information Management, Chengdu University of Technology, Chengdu 610059, China );Application of wavelet singularity analysis to noise removal for landslide’s displacement monitoring[J];Journal of Chengdu University of Technology(Science & Technology Edition);2005-02
2 Hsu Houtse (Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China);Satellite Gravity Missions-New Hotpoint in Geodesy[J];Developments In Surveying and Mapping;2001-03
3 李军;A PPLICATION OF GIS AND THE SOCIAL BACKGROUND[J];Bulletin of Surveying and Mapping;1995-04
4 Shao Juliang. Li Deren(Wuhan Technical University of Surveying and Mapping);WAVELET AND ITS APPLICATION TOIMAGE EDGE DETECTION[J];Acta Geodaetica Et Cartographic Sinica;1993-02
5 HUANG Ding-fa1, DING Xiao-li2, CHEN Yong-qi2, GONG Tao1, XIONG Yong-liang1 (1. Southwest Jiaotong University, Chengdu 610031,China; 2. The Hong Kong Polytechnic University, Hong Kong,China);Wavelet Filters Based Separation of GPS Multi-path Effects and Engineering Structure Vibrations[J];Acta Geodaetica Et Cartographic Sinica;2001-01
6 HUANG Sheng-xiang,LIU Jing-nan (Wuhan University, Wuhan 430079, China);A Novel Method for Reducing Noises in GPS Deformation Monitoring System[J];Acta Geodaetica Et Cartographic Sinica;2002-02
7 ZHAO Xi-an~(1,2),LI De-ren~2(1. College of Architecture, Xi'an University of Technology and Architecture,Xi'an 710055,China; 2. National Laboratory for Information Engineering in Surveying,Mapping and Remote Sensing, Wuhan University, Wuhan 430070,China);Constructing Two Dimension Symmetric Wavelets for Extracting Edge Features of Image at Multiscales[J];Acta Geodaetica Et Cartographic Sinica;2003-04
8 LIU Zhe~1,HAO Chong-yang~1,FENG Wei~2,LIU Xiao-xiang~1,FAN Yang-yu~1 (1.Department of Electronic Engineering, Northwestern Polytechnic University, Xi'an 710072, China; 2. Department of Computer Science, Northwestern Polytechnic University, Xi'an 710072, China);A Remotely Sensed Image Fusion Method Based on Wavelet Coefficient Features[J];Acta Geodaetica Et Cartographic Sinica;2004-01
9 Geng Zexun; Qian Zengbo(Zhengzhou Institute of surveying&Mapping,450052);BORDER PROCESSING IN WAVELET TRANSFORM[J];ACTA GEODAETICA ET CARTOGRAPHICA SINICA;1996-03
10 Zhu Changqing, Yang Qihe, Zhu Wenzhong (Zhangzhou Institute of Surveying and Mapping,450052) (National Laboratory on Machine Perception, Peking University,100871);REMOTE SENSING RELIEF IMAGE TEXTURE ANALYSIS AND CLASSIFICATION BASED ON WAVELET TRANSFORM FEATURES[J];ACTA GEODAETICA ET CARTOGRAPHICA SINICA;1996-04
【Secondary References】
Chinese Journal Full-text Database 7 Hits
1 Zou Zhengbo1,2),Xing Lelin1,2),Li Hui1,2),Kang Kaixuan1,2) and Zhou Xin1,2)1)Institue of Seismology,CEA,Wuhan 4300712)Crustal Movement Laboratory,Wuhan 430071;RESEARCH ON GRACE SATELLITE GRAVITY CHANGES IN CHINESES MAINLAND AND ITS VICINITY[J];Journal of Geodesy and Geodynamics;2008-01
2 Zou Zhengbo1,2,3),Luo Zhicai1),Li Hui2,3),Shen Chongyang2,3) and Zhou Xin2,3)1)School of Geodesy and Geometics, Wuhan University, Wuhan 4300792)Institue of Seismology,CEA,Wuhan 4300713)Crustal Movement Laboratory,Wuhan 430071;DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE[J];Journal of Geodesy and Geodynamics;2010-02
3 DUAN Hu-rong1,2,ZHANG Yong-zhi1,LIU Feng1,KANG Rong-hua1(1.School of Geological Engineering and Surveying,Chang'an University,Xi'an710054,Shaanxi,China)(2.Shaanxi Railway Institute,Weinan714000,Shaanxi,China);Study of the Gravity Variance in Chinese Mainland before and after Wenchuan Earthquake with GRACE Gravity Models[J];Journal of Seismological Research;2009-03
4 Zhengbo Zou1,2,3,Hui Li1,3,Zhicai Luo1 and Lelin Xing1,2,3 1School of Geodesy and Geodynamics,Wuhan University,Wuhan 430079,China2Institute of Seismology,China Earthquake Administration,Wuhan 430071,China3Crustal Movement Laboratory,Wuhan 430071,China;Seasonal gravity changes estimated from GRACE data[J];大地测量与地球动力学(英文版);2010-01
5 ZHAI Zhenhe1,2,LI Chao3,LI Hongna4(1.Institute of Surveying and Mapping of Information Engineering University,Zhengzhou 450052,China;2.61540 Troops,Xi'an 710054,China;3.92003 Troops,Zhanjiang 524037,China;4.61365 Troops,Tianjin 300140,China);The Error Analysis of Land Gravity Data Represented by Airborne Gravimetry Data[J];Hydrographic Surveying and Charting;2012-02
6 ZHAI Zhenhe1,2,SUN Zhongmiao2,REN Hongfei1,YANG Kun3(1.Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China; 2.Xi'an Institute of Surveying and Mapping,Xi'an 710054,China; 3.68029 Troops,Lanzhou 730030,China);Comparison and Analysis of Air Gravity Anomaly's Representative Error in Space and Spectral Domain[J];Journal of Geomatics Science and Technology;2012-02
7 XING Lelin1,2,3 LI Jiancheng1 LI Hui2,3 SUN Wenke4 (1 School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China)(2 Institute of Sesimology,CEA,40 Hongshance Road,Wuhan 430071,China) (3 Crustal Movement Laboratory,CEA,40 Hongshance Road,Wuhan 430071,China)(4 Earthquake Research Institute,University of Tokyo,Tokyo 113-0032,Japan);Detection of Co-seismic and Post-seismic Deformation Caused by the Sumatra-Andaman Earthquake Using GRACE[J];Geomatics and Information Science of Wuhan University;2009-09
【Secondary Citations】
Chinese Journal Full-text Database 10 Hits
1 Wu Guohua Luo Zengxiong Lai Qun Luo Weimin (Seismological Bureau of Yunnan Province, Kunming 650041, China);GRAVITY VARIATION IN THE WESTERN YUNNAN EARTHQUAKE PREDICTION TEST SITE (WYEPTS) BEFORE THE M_S7.3 EARTHQUAKE OCCURRENCE ON THE BORDER BETWEEN CHINA AND MYANMAR TO THE WEST OF MENGLIAN, YUNNAN PROVINCE[J];Earthquake;1998-02
2 Sun Shao'an;Xiang Aimin;Li Hui(Wuchang Institute of Seismology, CSB, Wuchang 430071, China);RESEARCH ON EVOLUTION OF WESTERN YUNNAN AND BEIJING REGIONAL GRAVITY FIELDS AND THEIR RELATIONSHIP WITH EARTHQUAKE[J];EARTHQUAKE;1999-01
3 Zhang Jazhi (Seismological Bureau of Ningxia Huizu Autonomous Region);CHARACTERISTICS OFGRAVITY FIELD BEFORE AND AFTER THE HAIYUAN EARTHQUAKE OF MAGNITUDE 5.5 ON APR 14, 1982[J];Crustal Deformation and Earthquake;1987-02
4 Chen Sugai Zhao Xiangjun Huang Tuo (Seismological Bureau of Ningxia);ANOMALOUS VARIATION OF GRAVITY BEFORE THE 1984 LINGWU EARTHQUAKE OF M_s=5.3[J];Crustal Deformation and Earthquake;1987-04
5 Wang Zhimin Wang Yu (Synthetical Survey Brigade,State Seismological Bureau) Wu Bing (Seismological Press);STUDY ON GRAVITY CHANGES ALONG THE ACTIVE FRACTURE BELTS IN BEIJING AREA[J];Crustal Deformation and Earthquake;1990-04
6 Fang Shengming,Zhang Xiankang,Jia Shixu,Duan Yonghong,Yang Zhuoxin and Qiu Shuyan\;(Research Center of Geophysics Exploration, CSB, Zhengzhou\ 450002);MULTIS-SCALE DECOMPOSITION OF BOUGUER GRAVITY ANOMALY AND SEISMIC ACTIVITY IN NORTH CHINA[J];Crustal Deformation and Earthquake;2002-01
7 Sun Shaoan, Xiang Aimin and Li Hui (Institute of Seismology, CSB, Wuhan\ 430071);CHANGES OF GRAVITY FIELD AND TECTONIC ACTIVITY IN FRONT REGION OF THE THREE-GORGES PROJECT[J];Crustal Deformation and Earthquake;2002-03
8 Song Zhiping 1),Wu Anxu 2),Wang Mei 3),Ni Youzhong 1) Zhu Jiamiao 1),Song Xianyue 1),Zhou Huagen 1) and Zhao Zhenlin 1) 1)Seismological Bureau of Shanghai City, Shanghai 200062 2) Seismological Bureau of Beijing City, Beijing 100081 3)Seismological Bureau of Shandong Province, Jinan 250014;APPLICATION OF WAVELET TRANSFORM TO ANALYSIS OF DIGITAL DEFORMATION DATA[J];Crustal Deformation and Earthquake;2003-04
9 Wan Yongge 1),Qi Furong 1), Meng Xiaochun 1) and Zhuang Xianhua 2) 1)College of Disaster Prevention Technology,CSB,Beijing 101601) 2)Middle School of Guantao County,Hebei Province,Handan 057750;WAVELET ANALYSIS OF SEISMIC DATA IN CHINESE MAINLAND AND NORTH CHINA[J];Crustal Deformation and Earthquake;2003-04
10 Zhang Yan 1),Wu Yun 1),Liu Yongqi 2),Chu Yonghai 2) and Shi Shunying 1) 1)Institute of Seismology,CSB,Wuhan 430071 2)Wuhan University,Wuhan 430072;IDENTIFICATION AND EXTRACTION OF EARTHQUAKE PRECURSOR FROM TIDAL DEFORMATION DATA[J];Crustal Deformation and Earthquake;2003-04
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved