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12篇 您的检索式:作者名="Xiwei Yuan"
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1Features and genesis of micro-nanometer-sized grains on shear slip surface of the 2008 Wenchuan earthquake显示文摘In coseismic surface rupture zones caused by the 2008 Mw 7.9 Wenchuan earthquake, some thin-layered fault gouges with strong deformation were observed in different locations. In this paper, fault gouge samples were taken as research objects from the Bajiaomiao village in the south-west segment of the principal rupture and the Heshangping village and the Shaba village in the north-east segment of the principal rupture where larger displacements were measured. Fabric characteristics of the fault gouge samples and the morphologies and structures of micro-nanometer grains on Y-shear surfaces were then analyzed by using a stereoscope and SEM. Observation results showed that obvious Y- and R-shears and obvious scratches were well developed in coseismic gouges caused by the 2008 Wenchuan earthquake. Micro-nanometer grains in the fault gouge of the Wenhcuan earthquake were formed mainly due to breaking, grinding, and powdering of fault slipping friction surface. Heat caused by fault slipping(maybe also including heat caused by thermal decomposition) played an important role in producing micro-nanometer sized grains. Existence occurrence state of micro-nanometer sized grains on fault slip surface includes singled grains and their complexes with shapes of ball, silkworm, pancake and mass. The structures mainly include dispersed and close-packed structures besides a few of striped and layered structures. All these structures were formed at the extreme unbalance conditions caused by rapid deforming during an earthquake. There always exist some voids between structures due to loosely contact. Only alienated grains are included in the stripped structure. But there are some singled grains with no deformation in dispersed and close-packed structures besides complexes of grains with morphologies of ball, silkworm, pancake and mass. The striped and close-packed structures are the results of plastic deformation, and the dispersed and layered structures are the results of brittle deformation whereas loose contact of different structures was caused mainly by discontinuous dynamic friction(fault stick-slipping). The structures of the micro-nanometer sized grains in coseismic fault gouge caused by the Wenchuan earthquake are the geological records of seismic fault slipping(it is not pseudotachylite), which could be used as an index of paleo-seismic events.YUAN RenMao ZHANG BingLiang XU XiWei LIN ChuanYong SI LanBing LI Xiao 2014Science China Earth Sciences2014,57,8:7
2Seismotectonics of the 2008 and 2009 Qaidam Earthquakes and its Implication for Regional Tectonics显示文摘Three magnitude >6 earthquakes struck Qaidam, Qinghai province, China, in November 10th 2008, August 28th and 31st 2009 respectively. The Zongwulongshan fault has often been designated as the active seismogenic structure, although it is at odd with the data. Our continuous GPS station (CGPS), the Xiao Qaidam station, located in the north of the Qaidam basin, is less than 30 km to the southwest of the 2008 earthquake. This CGPS station recorded the near field co-seismic deformation. Here we analyzed the co-seismic dislocation based on the GPS time series and the rupture processes from focal mechanism for the three earthquakes. The aftershocks were relocated to constrain the spatial characteristics of the 2008 and 2009 Qaidam earthquakes. Field geological and geomorphological investigation and interpretation of satellite images show that the Xitieshan fault and Zongwulongshan fault were activated as left lateral thrust during the late Quaternary. Evidence of folding can also be identified. Integrated analyses based on our data and the regional tectonic environment show that the Xitieshan fault is the fault responsible for the 2008 Qaidam earthquake, which is a low dip angle thrust with left lateral strike slip. The Zongwulongshan fault is the seismogenic fault of the 2009 earthquakes, which is a south dipping back thrust of the northern marginal thrust system of the Qaidam basin. Folding takes a significant part of the deformation in the northern marginal thrust system of the Qaidam basin, dominating the contemporary structure style of the northern margin of the Qaidam basin and Qilianshan tectonic system. In this region, this fault and fold system dominates the earthquake activities with frequent small magnitude earthquakes.CHEN Guihua XU Xiwei ZHU Ailan ZHANG Xiaoqing YUAN Renmao Yann KLINGER Jean-Mathieu NOCQUET 2013Acta Geologica Sinica(English Edition)2013,87,2:5
3Adverse Effect of Nonalcoholic Fatty Liver Disease on the Therapeutic Response in Patients with Chronic Hepatitis B显示文摘Background and Aims:The impact of nonalcoholic fatty liver disease(NAFLD)on the treatment outcome of chronic hepatitis B(CHB)is undefined and deserves an in-depth investigation.Methods:Histologically-proven CHB receiving first-line antiviral regimens as initial therapy was enrolled and grouped by the concurrence of NAFLD,and followed up at six monthly intervals.Therapeutic response related data were recorded and compared at multiple time points.Kaplan-Meier and Cox regression analyses were utilized to estimate the impact of NAFLD on complete virological response(CVR).Results:We enrolled 267 patients(CHB:164;CHB with NAFLD:103)with comparable follow-up durations.They were also comparable in baseline HBV DNA levels and HBeAg positivity.Patients with concomitant NAFLD showed less significant decline in HBV DNA,qHBsAg,pgRNA,and liver enzyme levels over time;moreover,their cumulative incidences of CVR were significantly lower and that of low-level viremia(LLV)were significantly higher at 6,12,18,24 months.First CVR of CHB was delayed with the presence NAFLD(11.0 vs.7.0 months,p<0.001)and further prolonged with higher grade of liver steatosis(Grade 2–3 vs.1:13.0 vs.9.0 months).On multivariate analysis,HBeAg positivity(HR:0.650,p=0.036),grade of steatosis(G2[HR:0.447,p=0.004];G3[HR:0.085,p=0.002])and HBV DNA(log10 IU/mL)(HR:0.687,p<0.001)were significantly associated with delayed CVR,whereas grade of necroinflammation(HR:1.758,p<0.001)accelerated the CVR.Conclusions:In CHB patients receiving initial antiviral therapy,NAFLD was associated with higher levels of HBV DNA,pgRNA,and liver enzymes,and higher incidence of LLV and delayed CVR.Siyu Zhang Xiaoxiao Zhang Huiming Jin Yao Dou Lu Li Xiwei Yuan Chen Dong Mengmeng Hou Yue-min Nan Jia Shang 2023Journal of Clinical and Translational Hepatology2023,11,1:1
4The 2010 Yushu earthquake triggered landslide hazard mapping using GIS and weight of evidence modeling显示文摘Chong Xu Xiwei Xu Yuan Hsi Lee Xibin Tan Guihua Yu Fuchu Dai 2012Environmental Earth Sciences2012,,6:1
5GIS-based support vector machine modeling of earthquake-triggered landslide susceptibility in the Jianjiang River watershed, China显示文摘Chong Xu Fuchu Dai Xiwei Xu Yuan Hsi Lee 2011Geomorphology2011,,:1
6The 2010 Yushu earthquake triggered landslide hazard mapping using GIS and weight of evidence modeling显示文摘Chong Xu Xiwei Xu Yuan Hsi Lee Xibin Tan Guihua Yu Fuchu Dai 2012Environmental Earth Sciences2012,,6:1
7GIS-based support vector machine modeling of earthquake-triggered landslide susceptibility in the Jianjiang River watershed, China显示文摘Chong Xu Fuchu Dai Xiwei Xu Yuan Hsi Lee 2011Geomorphology2011,,:1
8A Broad Spectrum Identification Approach for Two Generations of epsps GM Soybeans显示文摘In order to accurately identify the first and second generations of epsps genetically modified(GM) soybeans and related products,a broad spectrum identification approach was established using the real time Polymerase Chain Reaction(PCR) principle according to the homology of epsps genes of the first and second generations of GM soybeans.A pair of primer and probe was designed to simultaneously identify exogenous gene epsps of two generations of GM soybeans.Besides,evaluation was carried out on this approach from the accuracy,specificity,sensitivity and reproducibility.The experimental results indicated that(ⅰ) although there is certain difference in epsps gene sequence between the first and second generations of epsps genetically modified(GM) soybeans,the established approach can simultaneously detect the epsps genes of the bean curd using two generations of soybean as raw materials;(ⅱ) in the accuracy and specificity experiment,only cp4-epsps genes of two generations of GM soybeans were detected,so this approach has high specificity and accuracy;(ⅲ) in the experiment of 5 copies of epsps genes of 40 repeated identification reaction systems,5 copies of epsps genes can be detected each time,therefore at 100% confidence level,this approach can identify 5 copies of epsps genes,showing that this approach has high sensitivity and reproducibility.Qiuchi SONG Xiwei LIU Yiwei MOU Yuan JING Jun SONG 2017Asian Agricultural Research2017,9,12:0
9Intensive Observation of Reservoirinduced Seismicity and Preliminary Analysis on the Causes of Earthquakes in the Three Gorges Reservoir Area,Yangtze River显示文摘根据第 11 五年的计划的国家关键技术 RD 节目的要求,由 26 个地震车站组成的一个使增加密度的地震网络在 2009 年 3 月 21 短时期的地震计在湖北省的节在三个峡水库区域被建立, 5 宽带数字地震计。从三月到 2009 年 12 月, 2,995 ML -0 的一个总数。8 - 2。9 地震在从 145 m 三朵峡水库水水平玫瑰扣押到 172.8m 的试用期间被检测。用双差别地震地点算法, 2,837 地震精确被重定位。小本地地震的模式聚集在三个峡水库区域的结果表演呈现了线性分布或像团的簇分发,事件的像团的簇通常在从水滨的 5 km 的距离以内,并且地震的线性分发能被扩大到 16 km 的距离离开水滨。在三座峡水库的湖北节,地震主要在 Xiangxihe 河附近在 Xiannvshan 和 Jiuwanxi 差错的北结束被集中,并且沿着在在 Badong 区域的北河岸上的 Xietan 镇区和 Shenlongxi 区域的西方的长江的河岸,与焦点的深度不到 10km ,和 4km 在平均。在水库区域的地震频率与水库水水平变化有积极关联,显示 seismicity 属于水库导致的地震。沿着在水库区域的 Shenlong 河,地震在北 Badong 县显示出三线性分布,并且根据石灰岩地区常见的地形散布了分发。在碳酸盐阶层有地下的河。当水库被扣押时,水渗入了进地下的河,因此导致地震。在 Xiannvshan 的 crossriver 片断上的区域的地震指责, Jiuwanxi 差错并且在 Xietan , Shazhen 和 Xizhen 的区域西方,可能与弄软断绝有关 Xiannvshan 差错,或床上用品例如 Nukou 差错,连接,它将导致岩石群众的失败因此,导致地震。然而,关于被触发的机制的有说服力的结论仍然需要进一步的学习。另外, Zigui 县并且在 Badong 县的 Rangkou 镇东方的 Wenhua 和 Yanglin 向南接近区域, mininginduced 地震在水库的岸是的附近,并且上的矿发生了一些倒塌地震。Ma Wentao Xu Changpeng Yuan Jingli Li Hai'ou Xu Xiwei Zhang Xindong Zhang Lanfeng 2011Earthquake Research in China2011,25,3:0
10Relocation and Genetic Analysis of Earthquakes in the West of Xietan Area of Three Gorges Reservoir显示文摘136 earthquakes,taking place in the west of Xietan area,recorded by portable stations deployed in the Three Georges reservoir area were relocated using the double difference algorithm.The relocations show that the root-mean-square deviations of the relocations in the directions of E-W,N-S and U-D are 0.38km,0.33km and 0.98km,respectively.The earthquakes in clasolite area with focal depths of about 4km~5km take on linear distributions from the shallow to deep parts.These earthquakes were deduced to be reservoir-induced earthquakes of fault fracture type.In contrast,the earthquakes in limestone pavement with the focal depths about 2km~3km take on slightly divergent distributions and have the characteristics of reservoir-induced earthquakes of the karst collapse type.Li Hai'ou Ma Wentao Xu Xiwei Yuan Jingli Xu Changpeng 2011Earthquake Research in China2011,25,3:0
11Distribution Characteristics of the Seismicity of Zipingpu Reservoir Region after the Wenchuan Earthquake显示文摘815 earthquakes recorded by 12 seismic stations of the Zipingpu reservoir seismic network in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the Zipingpu reservoir.Relocation results show that the earthquakes are concentrated relatively in three zones.The distribution characteristics of focal depth are obviously different among different concentration zones.This means earthquakes in different concentration zones may have different causes.Compared to relocation of earthquakes taking place before the Wenchuan earthquake done by other researchers,the seismic concentration zones in the reservoir area shifted obviously after the Wenchuan earthquake.These variations are related to local stress adjustment in the reservoir area and may also be related to the diffusion depth and range of increased pore pressure caused by rock failure in the course of Wenchuan earthquake.Li Hai'ou Ma Wentao Xu Xiwei Xie Ronghua Yuan Jingli Xu Changpeng 2011Earthquake Research in China2011,25,3:0
12Screening of FOXP3-interacted proteins by yeast two-hybrid technique显示文摘屏蔽由酵母与 Treg 说明因素 forkhead 盒子蛋白质 P3 (FOXP3 ) 交往的蛋白质的目的二混血儿的系统。方法人的 FOXP3 基因被巢 RT-PCR 从外部血 mononuclear 细胞(PBMC ) 放大并且插入了到 plasmid pGBKT7 构造诱饵向量,然后,在宿主酵母紧张 AH109 的诱饵向量的自我激活和毒性被观察。此后,一个人的肝 cDNA 图书馆被诱饵向量屏蔽。积极克隆被营养素缺乏的文化和 back-hybridizing 外面选择。从候选人的序列积极克隆被生物信息学方法爆炸并且分析。编码 FOXP3 的构造诱饵向量没在酵母 AH109 被发现自我激活和毒性的结果。与 FOXP3 交往了包括肿瘤蛋白质 D52,拼接的三蛋白质因素 3b 子单元 1 并且假想蛋白质,被识别。与 FOXP3 交往的结论三新候选人蛋白质被这酵母外面选择二混血儿的系统和图书馆,它可以在 Treg 便于 FOXP3 的进一步的学习。Zhou Lina Wu Jun Luo Gaoxing He Weifeng Chen Xiwei Bo Ganping Yuan Shunzong Zhang Xiaorong Hu Xiaohong 2008Journal of Medical Colleges of PLA(China)2008,23,2:0
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