期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
断层粗糙表面的分形模拟 被引量:9
1
作者 孙洪泉 谢和平 《中国矿业大学学报》 EI CAS CSCD 北大核心 1999年第5期433-436,共4页
根据二元分形插值理论, 运用断层面上部分信息点数据, 对断层面的粗糙形态进行了分形插值模拟. 由于岩石断裂表面具有统计自相似的特征,提出了局部邻域的划分以及纵向压缩比的确定的改进分形插值曲面的方法. 根据地质统计学中变差... 根据二元分形插值理论, 运用断层面上部分信息点数据, 对断层面的粗糙形态进行了分形插值模拟. 由于岩石断裂表面具有统计自相似的特征,提出了局部邻域的划分以及纵向压缩比的确定的改进分形插值曲面的方法. 根据地质统计学中变差函数原理, 以变差函数的变程来划分局部邻域; 运用多元统计分析原理, 以观测数据一次趋势面的偏差值来确定分形插值中的纵向压缩比, 从而使得模拟结果更加符合真实断层面的特征. 研究结果表明, 分形插值曲面的理论与方法比传统的插值方法更加精确地反映断层表面的粗糙特征, 它的应用为研究断层面的粗糙程度对工程的影响提供了一套新的方法. 展开更多
关键词 分形插值曲面 断层表面 粗糙程度 分形模拟
下载PDF
第四纪断层上断裂活动的群集及迁移现象 被引量:23
2
作者 丁国瑜 《第四纪研究》 CAS CSCD 1989年第1期36-47,共12页
对许多第四纪断层上形成地表破裂的巨大滑动事件及错动位移状况的具体研究表明,在不同时间段它们的数量和强度是变化的,不均匀的。这种断层活动的不均匀性主要表现在两个方面:一是滑动事件的发生往往集中于一定的地段和一定的时间段,并... 对许多第四纪断层上形成地表破裂的巨大滑动事件及错动位移状况的具体研究表明,在不同时间段它们的数量和强度是变化的,不均匀的。这种断层活动的不均匀性主要表现在两个方面:一是滑动事件的发生往往集中于一定的地段和一定的时间段,并与相对平静的阶段相交替,即所谓断裂活动的群集性;另一方面的表现是集中发生滑动事件段落(或区域)在空间上的迁移变化。这是中国大陆内部第四纪断层活动所表现出的主要特征之一。这方面的实例可见于许多活断层上。如沿郯庐断层、鲜水河断层以及河西走廊断裂带、阿尔金断裂带等。深入研究第四纪断层活动的这一不均匀特性对正确评估活断层的活动程度和潜在地震危险性具有实际应用意义。 展开更多
关键词 第四纪断层 断裂活动 表面断层 群集 迁移 滑动速率
下载PDF
发射光谱法测定碳钢断裂表层中的Mn
3
作者 郭庆林 张金平 +1 位作者 魏艳红 杨志平 《光谱实验室》 CAS CSCD 2001年第2期275-277,共3页
本文介绍了用高频火花光源激发样品 ,多点采样迭加曝光法 ,测量碳钢棒拉伸断裂层表面组分中的Mn,结果表明 ,分析方法的精密度 RSD小于 7%。
关键词 发射光谱 断层表面 分析方法
下载PDF
THRUST NAPPE STRUTRUE IN THE JINGGANG MOUNTAIN: CHARACTERISTICS AND SIGNIFICANCE FOR PROSPECTION OF ORE DEPOSITS
4
作者 CUI Xuejun, XIA Bin and ZHOU Jibin(Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry & South ChinaSea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, GD 510640, China Jiangxi Institute of Geological Survey, Nanchang, JX 330201, China) 《Geotectonica et Metallogenia》 2003年第1期1-10,共10页
Nappe structure, as was first discovered by the authors during the regional geological survey at the scale of 1:50,000 in The Jinggang Mountain, is mainly comprised of a series of NNE-NE-striking thrust fault zones an... Nappe structure, as was first discovered by the authors during the regional geological survey at the scale of 1:50,000 in The Jinggang Mountain, is mainly comprised of a series of NNE-NE-striking thrust fault zones and thrust sheets among them. Sinian, Cambrian, Ordovician, Devonian, Carboniferous,Triassic, Jurassic and Cretaceous strata are involved in the thrust nappe system. The nappe structure is of the type of duplex structures formed as a result of the earlier stage migration from SE to NW and late stage migration from E to W of sedimentary cover or basement strata. Formation of the nappe structure in the studied area involves two main epochs: Early Yanshanian and Late Yanshanian to Early Himalayan. The mineral deposits and the buried coalfields in the area, especially the latter, are extensively controlled by the nappe structure. 展开更多
关键词 thrust nappe structure Mesozoic inland deformation the Jinggang Mountain.
下载PDF
Techniques for Surveying Urban Active Faults by Seismic Methods
5
作者 Xu Mingcai Gao Jinghua Liu Jianxun Rong Lixin 《Earthquake Research in China》 2005年第3期240-248,共9页
Using the seismic method to detect active faults directly below cities is an irreplaceable prospecting technique. The seismic method can precisely determine the fault position. Seismic method itself can hardly determi... Using the seismic method to detect active faults directly below cities is an irreplaceable prospecting technique. The seismic method can precisely determine the fault position. Seismic method itself can hardly determine the geological age of fault. However, by considering in connection with the borehole data and the standard geological cross-section of the surveyed area, the geological age of reflected wave group can be qualitatively (or semi-quantitatively) determined from the seismic depth profile. To determine the upper terminal point of active faults directly below city, it is necessary to use the high-resolution seismic reflection technique. To effectively determine the geometric feature of deep faults, especially to determine the relation between deep and shallow fracture structures, the seismic reflection method is better than the seismic refraction method. 展开更多
关键词 Active fault Reflection seismic HIGH-RESOLUTION Seismic prospecting
下载PDF
VolGraph-A PC-Based Visualization System for Three-Dimensional Medical Reconstructions
6
作者 张加万 孙志刚 孙济洲 《Transactions of Tianjin University》 EI CAS 2003年第3期206-210,共5页
Three-dimensional reconstructions from tomography slices are paid great attention in medical applications nowadays. This paper introduces the design and the implement of VolGraph system: a new, inexpensive, PC-based v... Three-dimensional reconstructions from tomography slices are paid great attention in medical applications nowadays. This paper introduces the design and the implement of VolGraph system: a new, inexpensive, PC-based visualization tool for three-dimensional medical reconstructions, which fully integrates the latest popular visualization algorithms ranging from classical surface rendering algorithm to volume rendering algorithms, such as Ray Casting, Splatting, and Shear-Warp.The input of VolGraph can be medical ima- ges including CT, MRI, etc, and the output can be in common image, VRML/XML or animation formats. Practice proves that the realization of a medical volume visualization system is now feasible on desktop PCs. 展开更多
关键词 VolGraph medical reconstructions SPLATTING Marching Cubes volume rendering
下载PDF
断层三维扩展过程的实验研究 被引量:11
7
作者 刘力强 刘培洵 +2 位作者 黄凯珠 马少鹏 郭彦双 《中国科学(D辑)》 CSCD 北大核心 2008年第7期833-841,共9页
实验研究三维断层的形成和扩展对于理解实际断层作用过程具有重要意义.在双轴压缩条件下开展了断层三维扩展过程的实验研究,利用多通道数字化高密度应变观测和基于可见光图像分析的数字散斑相关测量技术对岩石样品应变场的详细结构进行... 实验研究三维断层的形成和扩展对于理解实际断层作用过程具有重要意义.在双轴压缩条件下开展了断层三维扩展过程的实验研究,利用多通道数字化高密度应变观测和基于可见光图像分析的数字散斑相关测量技术对岩石样品应变场的详细结构进行了动态观测和分析,同时利用多通道声发射全波形三维定位系统对样品内部微破裂的发育过程进行了观测.实验结果表明,断层在三维空间的扩展模式与二维明显不同,表现出更复杂的空间展布形态和变形机制.断层的三维扩展过程可以划分为3个基本阶段:第一裂纹扩展阶段—翼裂纹扩展阶段、转换阶段—花瓣裂纹活动阶段和第二裂纹扩展阶段—贝壳断面形成阶段.不同阶段具有不同的主导裂纹扩展方式,并对应不同的变形场和微破裂分布.其中,花瓣裂纹活动阶段在三维断层的发育过程中至关紧要,它是从表面似二维扩展向三维扩展转换的关键,也是三维断层扩展区别于二维断层的核心所在. 展开更多
关键词 表面断层 三维裂纹扩展 应变场 数字散斑 声发射(AE)
原文传递
Functional tumor imaging based on inorganic nanomaterials 被引量:1
8
作者 Jiangfeng Du Xiao Zhang +1 位作者 Liang Yan Rui Chen 《Science China Chemistry》 SCIE EI CAS CSCD 2017年第11期1425-1438,共14页
Inorganic nanomaterials have attracted substantial research interest due to their unique intrinsic physicochemical properties. We highlighted recent advances in the applications of inorganic nanoparticles regarding th... Inorganic nanomaterials have attracted substantial research interest due to their unique intrinsic physicochemical properties. We highlighted recent advances in the applications of inorganic nanoparticles regarding their imaging efficacy, focusing on tumor-imaging nanomaterials such as metal-based and carbon-based nanomaterials and quantum dots. Inorganic nanoparticles gain excellent in vivo tumor-imaging functions based on their specific characteristics of strong near-infrared optical absorption and/or X-ray attenuation capability. The specific response signals from these novel nanornaterials can be captured using a series of imaging techniques, i.e., optical coherence tomography (OCT), X-ray computed tomography (CT) imaging, two-photon luminescence (TPL), photoacoustic tomography (PAT), magnetic resonance imaging (MRI), surface-enhanced Raman scattering (SERS) and positron emission tomography (PET). In this review, we summarized the rapid development of inorganic nanomaterial applications using these analysis techniques and discussed the related safety issues of these materials. 展开更多
关键词 imaging gold nanoparticles carbon nanotube GRAPHENE quantum dots TOXICITY
原文传递
Direct estimation of rupture depths of earthquake faults from coseismic surface deformation 被引量:1
9
作者 FU Zhen HU CaiBo +2 位作者 ZHANG HaiMing XU HuiHui CAI YongEn 《Science China Earth Sciences》 SCIE EI CAS 2014年第8期1986-1994,共9页
The rupture dimensions of earthquake faults are important parameters for characterizing earthquake ruptures and ground motions. Two key parameters to be determined are the rupture depth and dip angle of earthquake fau... The rupture dimensions of earthquake faults are important parameters for characterizing earthquake ruptures and ground motions. Two key parameters to be determined are the rupture depth and dip angle of earthquake faults. Dislocation theory in an elastic half space indicates that if a seismic rupture directly runs up to the ground surface, there exist zero points of horizontal strain in the surface deformation, which correspond to the rupture depths, except for pure strike-slip faults. In this study, we use numerical simulations to investigate the possibility of inferring rupture depths from zero-strain points for cases of buried faults and heterogeneous media. The results show that the correspondence of zero-strain points to the rupture depths can be influenced by the heterogeneity of the underground media and the stress field. For buried faults, the correspondence relationship is approximately valid when the fault depth is <1 km. In addition, the range of earthquake fault dip angles can be estimated by horizontal displacements on the ground. We also study how to determine the rupture depths of faults from InSAR data after large earthquakes, and successfully apply the method to the 2008 Wenchuan earthquake. The method proposed here, which determines the parameters of fault geometry according to surface deformation, is simple and easy to perform. With independent of aftershocks, it can provide valuable constraints to kinematic inversions. 展开更多
关键词 surface deformation zero-strain points rupture depths dip angles of faults INSAR
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部