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Science china Earth Sciences 2010年第5期53卷 657-664页

作者： zhai qingguo1 wang jun1, li cai2.& su li3.1 institute of geology, {2. {3. of Geological Sciences, beijing 10003., china 2.College of Earth Sciences, Jilin University, Changchun 13.061, china 3.The Geological Laboratory Center and State Key Laboratory of Geological Processes and Mineral Resources, china University of Geo- sciences, beijing 100083. china 1. institute of geology Chinese Academy of Geological Sciences Beijing 100037 China2. College of Earth Sciences Jilin University Changchun 130061 China3. The Geological Laboratory Center and State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China

Metabasites consisting of metamorphic ultra-mafic rocks, cumulate gabbro, gabbro (diabase), basalt, and plagiogranite are exposed at the Taoxinghu area in central Qiangtang, northern Tibetan Plateau. Zircon SHRIMP U-Pb dating for the cumulate gabbro yields a weighted mean age of 467±4 Ma, which is the oldest and most reliable magmatic age in this area. Zircon 176Hf/177Hf ratios range from 0.2.2.15 to 0.2.2.57, with εHf(t) values of 5.02.0.2., indicating that the cumulate gabbro was mainly derived from the depleted mantle. In addition, geochemical data of metabasites suggest that they have similar characteristics to those in the mid-ocean ridge basalts (MORB). The Taoxinghu metabasites may represent the fragment of Early Paleozoic ophiolite in the "Central Uplift" of the Qiangtang, northern Tibetan Plateau.

关键词： Qiangtang cumulate gabbro SHRIMP dating Hf isotope

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang li li‑Jiao {2. Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑{3. Ning Kai Pan Wei Xu Tao li su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑Yang sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin ling Kang Bo li Gong li Xiao li Yang li Jie liu Rong liu Shu‑Bin liu Yi‑Na liu Guang‑Yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng {2. Peng‑Cheng {2. Zhao‑Hui {2. Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑{3. Zhu Chong Zou institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China china academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest institute of Nuclear Technology Xi’an 710024China University of chinese academy of Sciences Beijing 100049China china Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the{3. Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

国家重点生态功能区生态状况变化与保护成效评估——以海南岛中部山区国家重点生态功能区为例

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地理学报 2018年第3期73卷 429-441页

作者：侯鹏翟俊曹巍杨旻蔡明勇李静环境保护部卫星环境应用中心北京100094 中国科学院地理科学与资源研究所北京100101

自2.00年提出生态功能保护区的概念以来,历时17年不断探索和发展完善,中国已经形成了一批国家重点生态功能区和相关配套政策,成为生态保护红线划定的重要依据和主体功能区战略实施的主要组成,对保障国家生态安全和优化国土空间格局具有... 详细信息

自2.00年提出生态功能保护区的概念以来,历时17年不断探索和发展完善,中国已经形成了一批国家重点生态功能区和相关配套政策,成为生态保护红线划定的重要依据和主体功能区战略实施的主要组成,对保障国家生态安全和优化国土空间格局具有十分重要的意义。海南岛中部山区在2.01年成为国家生态功能保护区试点,2.10年被确定为国家重点生态功能区,是较早实施生态功能保护的重点管控区域之一。本文以海南岛中部山区热带雨林重点生态功能区为研究区域,综合利用多源卫星遥感数据和地面观测统计数据,集成地统计学和生态评估模型模拟方法,以生态系统格局、植被长势、服务功能为主要评估内容,通过时空尺度拓展和多维时空对比分析,探讨了该重点生态功能区生态系统变化和保护成效。结果发现:(1)2.13.功能区森林面积占比为84.5%,显著高于海南岛平均水平。1990-2.13.功能区内建设用地逐渐增加。2.10年功能区实施后,人类活动强度仍然呈现持续增加态势,面积比例从0.5%增加到0.8%,主要表现为城镇建设和耕地开垦。(2.功能区水源涵养服务功能明显优于功能区外部,1990-2.13.水源涵养服务功能总体上略有增加,但是不同时间段的波动变化明显,特别是1990-2.00年和2.00-2.13.两个时间段内均表现为先减少后增加的变化特征。功能区单位面积的水源涵养量为51.78万m2.km2.明显高于功能区外部。(3.功能区土壤保持服务功能明显要优于功能区外部,1990-2.13.表现出剧烈波动、稳定性较差。功能区单位面积的土壤保持量为1.95万t/km2.明显高于功能区外部。(4)功能区人类扰动指数明显小于功能区外部,生物多样性威胁程度明显偏小,有利于生物多样性的保护。功能区平均人类扰动指数为0.3.64,比功能区外部低0.1152.1990-2.13.功能区外部人类扰动指数变化幅度为0.0152.约为功能区内部变化幅度的5.3.倍。特别是2.10-2.13.,功能区内部人类扰动指数增加幅度要明显小于功能区外部。

关键词：生态功能区生态系统服务功能保护成效

SHRIMP U-Pb dating and Hfisotopic analyses of zircons from the mafic dyke swarms in central Qiangtang area,Northern Tibet

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chinese Science Bulletin 2009年第21期54卷 2279-2285页

作者： zhai qingguo {2. {3. wang jun JI ZhanSheng wang Yong institute of geology Chinese Academy of Geological Sciences Beijing 100037 China College of Earth Sciences Jilin University Changchun 130061 China

In the "Central Uplift" of Qiangtang,Northern Tibet,a large scale of mafic dyke swarms extended in E-W *** SHRIMP U-Pb dating on two representative samples of diabase dyke yield weighted mean ages of 2.4 ± 3.Ma and 3.2.± 4 Ma,respectively,{3.ggesting they emplaced in the Late Carboniferous to Early *** 176Hf/177Hf ratios range from 0.2.2.52.to 0.2.3.41,with εHf(t) values of +12.1 to +12.2.and Hf modal(TDM) ages of ～440―460 *** data indicate that these mafic dykes were mainly derived from the depleted *** addition,geochemical data {3.ggest that these mafic dyke swarms are ofintra-plate ***,the mafic dyke swarms represent products during the extensional process associated with the opening of the Paleo-Tethys Ocean in the area.

关键词：锆石SHRIMP 镁铁质岩墙群同位素分析中部地区羌塘 Pb 藏北平均年龄

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CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-{3. Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua cai Wenyong cai Wu{3. cai Yijian cai Yizhou cai Yuchen cai Haiying cai Huacheng cai Lorenzo Calibbi {3.song Cang Guofu Cao Jianshe Cao Antoine Chance Xue{3. Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Ming{3. Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing beijing Computational Science Research Center Beijing beijing Conveyi LTD Beijing beijing Glass Research institute Co. LtdBeijing beijing institute of Technology Beijing beijing Normal University Beijing Brown University ProvidenceRI Budker institute of Nuclear Physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of engineering physics MianyangSichuan china building materials academy Beijing china Center of Advanced Science and Technology Beijing china institute of Atomic Energy Beijing china Jiliang University HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china University of Geosciences Beijing china University of Geosciences WuhanHubei china University of Mining and Technology XuzhouJiangsu china West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint institute for Nuclear Research(DLNP JINR) Dubna East china University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 3. GeV linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 3. MW per beam,it can achieve a luminosity of 5×10^(3.)cm^(-2.s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13.ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3.million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2.15)and the Conceptual Design Report(CDR,2.18),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2.2.-2.2.,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2.3.s.

关键词： initiated exceeding precise

Description of elastic scattering for 7li-induced reactions on 1p-shell nuclei

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chinese Physics C 2024年第2期48卷 153-161页

作者：徐永丽苏新武孙志豪韩银录孙小军张冬红蔡崇海 College of Physics and Electronic Science Shanxi Datong UniversityDatong 037009China Graduate School of china academy of Engineering Physics Beijing 100088China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China College of Physics Guangxi Normal UniversityGuilin 541004China Department of Physics Nankai UniversityTianjin 300071China

The experimental data of elastic scattering angular distributions for 9Be,10B,11B,12.,13.,15N,and 16O targets from 4.5 to 13..8 MeV and 7li target from 8.0 to 42.0 MeV are fitted to realize the global phenomenological optical potentials(GPOPs)for the 7li-induced reactions on 1p-shell ***,the 7li elastic scattering from the 1p-shell nuclei can be systematically described using the established *** elastic scattering angular distributions are also reanalyzed using a microscopic method within the framework of the new version of double folding S?o Paulo potential(SPP2..To better describe the elastic scattering at backward angles,the contribution of elastic transfer is further estimated by the distorted wave Born approximation(DWBA)*** on the obtained GPOPs,the inelastic scattering angular distributions are also obtained through the coupled channels(CC)method for the different excited states.

关键词： optical potential elastic scattering nuclear reaction mechanisms

Analysis of Genetic Diversity and Population Structure of Maize Landraces from the South Maize Region of china

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Agricultural Sciences in china 2010年第9期9卷 1251-1262页

作者： liU Zhi-zhai GUO Rong-hua ZHAO Jiu-ran {2. Yi-lin wang Feng-ge CAO Mo-ju wang Rong- huan SHI Yun-su SONG Yan-chun wang Tian-yu li Yu Maize Research institute Southwest University Chongqing 400716 P.R. China Institue of Crop Sciences/National Key Facility for Gene Resources and Genetic Improvement Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China Maize Research institute Sichuan Agricultural University Ya＇an 625014 P.R.China Maize Research Center Beijing Academy of Agricultural and Forestry Sciences Beijing 100089 P.R. China

Understanding genetic diversity and population structure of landraces is important in utilization of these germplasm in breeding programs. In the present study, a total of 143.core maize landraces from the South Maize Region （SR） of china, which can represent the general profile of the genetic diversity in the landraces germplasm of SR, were genotyped by 54 DNA microsatellite markers. Totally, 517 alleles （ranging from 4 to {3.） were detected among these landraces, with an average of 9.57 alleles per locus. The total gene diversity of these core landraces was 0.61, suggesting a rather higher level of genetic diversity. Analysis of population structure based on Bayesian method obtained the samilar result as the phylogeny neighbor-joining （N J） method. The results indicated that the whole set of 143.core landraces could be clustered into two distinct groups. All landraces from Guangdong, Hainan, and 15 landraces from Jiangxi were clustered into group 1, while those from the other regions of SR formed the group {3. The results from the analysis of genetic diversity showed that both of groups possessed a similar gene diversity, but group 1 possessed relatively lower mean alleles per locus （6.63. and distinct alleles （91） than group {3.（7.94 and 110, respectively）. The relatively high richness of total alleles and distinct alleles preserved in the core landraces from SR suggested that all these germplasm could be useful resources in germplasm enhancement and maize breeding in china.

关键词： maize core landraces genetic diversity population structure

Percutaneous transgastric endoscopic tube ileostomy in a porcine survival model

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World Journal of Gastroenterology 2016年第37期22卷 8375-8381页

作者： Hong Shi su-Yu Chen Yong-Guang wang Sheng-{2. Jiang He-{3. cai Kai {3.n Zhao-Fei Xie Fen-Fang Dong Department of Gastro- intestinal Endoscopy Fujian Provincial Cancer Hospital Affiliated Cancer Hospital of Fujian Medical University Department of Minimally Invasive surgery Beijing Chuiyangliu Hospital Institute of Minimally Invasive Medicine of Tongji University Department of Gastroenterology Fuzhou Seventh Hospital Department of General surgery Fuzhou Seventh Hospital Faculty of Medical Technology and Engineering Fujian Medical University

AIM To introduce natural orifice transgastric endoscopic surgery(NOTES) tube ileostomy using pelvis-directed submucosal tunne{2.ng endoscopic gastrostomy and endoscopic tube *** Six {2.ve pigs(three each in the non-survival and survival groups) were used. A double-channeled therapeutic endoscope was introduced perorally into the stomach. A gastrostomy was made using a 2.cmtransversal mucosal incision following the creation of a 5-cm longitudinal pelvis-directed submucosal tunnel. The pneumoperitoneum was estab{2.shed via the endoscope. In the initial three operations of the series, a laparoscope was transumbi{2.cally inserted for guiding the tunnel direction, intraperitoneal spatial orientation and distal ileum identification. Endoscopic tube ileostomy was conducted by adopting an introducer method and using a Percutaneous Endoscopic Gastrostomy Catheter Kit equipped with the Loop Fixture. The distal tip of the 15 Fr catheter was placed toward the proximal {2.mb of the ileum to optimize intestinal content drainage. Finally, the tunnel entrance of the gastrostomy was closed using nylon endoloops with the aid of a twin grasper. The gross and histopathological integrity of gastrostomy closure and the abdominal wall-ileum stoma tract formation were assessed 1 wk after the *** Transgastric endoscopic tube ileostomy was successful in all six pigs, without major bleeding. The mean operating time was 71 min(range: 60-110 min). There were no intraoperative comp{2.cations or hemodynamic instabi{2.ty. The post-mortem, which was conducted 1-wk postoperatively, showed complete hea{2.ng of the gastrostomy and adequate stoma tract formation of *** Transgastric endoscopic tube ileostomy is technically feasible and reproducible in an animal model, and this technique is worthy of further improvement.

关键词： Natural orifice transluminal endoscopic surgery Tube ileostomy Endoloop Pigs submucosal tunneling

Epidemiology of hepatitis C virus in Iran

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World Journal of Gastroenterology 2015年第38期21卷 10790-10810页

作者： Peng Huang li-Guo Zhu Ye-Fei Zhu Ming Yue Jing su Feng-{2. Zhu Hai-Tao Yang Yun Zhang Hong-Bing Shen Rong-Bin Yu Xiang-{3. zhai Zhi-Hang Peng Department of Epidemiology and Biostatistics School of Public Health Nanjing Medical University Jiangsu Provincial Centre for Disease Control and Prevention Department of Infectious Disease The First Affiliated Hospital of Nanjing Medical University Department of Epidemiology Medical Institute of Nanjing Army

In Iran,the prevalence of hepatitis C virus(HCV) infection is relatively low according to the populationbased epidemiological studies. However,the epidemiology of HCV is changing and the rate of HCV infection is increasing due to the growth in the number of injecting drug users in the society. In addition,a shift has occurred in the distribution pattern of HCV genotypes among HCV-infected patients in Iran. Genotype 1a is the most prevalent genotype in Iran,but in recent years,an increase in the frequency of 3. and a decrease in 1a and 1b have been reported. These variations in the epidemiology of HCV reflect differences in the routes of transmission,status of public health,lifestyles,and risk factors in different groups and geographic regions of Iran. Health policy makers should consider these differences to establish better strategies for control and prevention of HCV infection. Therefore,this review was conducted to present a clear view regarding the current epidemiology of HCV infection in Iran.

关键词： Hepatitis C virus Blood donors Injecting drug user

Variational characteristics of shear-wave splitting on the 2.01 Shidian earthquakes in Yunnan, china

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Acta Seismologica Sinica(English Edition) 2004年第6期17卷 635-641页

作者： GAO Yuan liANG Wei DING Xiang XUE Yan cai Ming-{2. liU Xi-qiang su You-jin PENG li-guo institute of Earthquake Science China Earthquake Administration Beijing 100036 China Graduate Schoo1chinese academy of Sciences Beijing 100039China Earthquake Administration ofYunnan Province Kunming 650041China Earthquake Administration of Shandong Province Jinan 250014 China Center for Comprehensive surveying China Earthquake AdministrationBeijing 100039China

In 2.01 three earthquakes occurred in Shidian in Yunnan Province, which were the MS=5.2.on April 10, the MS=5.9 on April 12.and the MS=5.3.on {3.e 8. Based on the data from the station Baoshan of Yunnan Telemetry Digital Seismograph Network, the variational characteristics of shear-wave splitting on these series of strong earthquakes has been studied by using the systematic analysis method (SAM) of shear-wave splitting. The result shows the time delays of shear-wave splitting basically increase with earthquake activity intensifying. However the time delays abruptly decrease immediately before strong aftershocks. It accords with the stress relaxation before earthquakes, which was found recently in study on shear-wave splitting. The result suggests it is significant for reducing the harm degree of earthquakes to develop the stress-forecasting on earthquake in strong active tectonic zones and economic developed regions or big cities under the danger of strong earthquakes.

关键词： shear-wave splitting temporal change earthquake stress-forecasting Shidian earthquakes SAM analysis