Practical and robust experimental determination of c13 and Thomsen parameter δ          下载免费PDF全文

Fuyong Yan  De‐Hua Han  Xue‐Lian Chen 《Geophysical Prospecting》2018,66(2):354-365

We analysed the complications in laboratory velocity anisotropy measurement on shales. There exist significant uncertainties in the laboratory determination of c₁₃ and Thomsen parameter δ. These uncertainties are primarily related to the velocity measurement in the oblique direction. For reliable estimation of c₁₃ and δ, it is important that genuine phase velocity or group velocity be measured with minimum uncertainty. The uncertainties can be greatly reduced if redundant oblique velocities are measured. For industrial applications, it is impractical to make multiple oblique velocity measurements on multiple core plugs. We demonstrated that it is applicable to make multiple genuine oblique group velocity measurements on a single horizontal core plug. The measurement results show that shales can be classified as a typical transversely isotropic medium. There is a coupling relation between c₄₄ and c₁₃ in determining the directional dependence of the seismic velocities. The quasi‐P‐wave or quasi‐S‐wave velocities can be approximated by three elastic parameters.  相似文献   

利用柱腹板屈曲后强度的钢框架节点板域抗震性能试验研究   总被引：4，自引：1，他引：4  

贾连光  张绍武  董富军  吴利权 《地震工程与工程振动》2002,22(4):85-89

利用腹板屈曲后强度，可以充分发挥钢材的性能，降低钢材用量。为检验利用柱腹板屈曲后强度的钢框架节点板域的抗震性能，设计了边柱和中柱节点，对其进行了低周反荷载下的试验，本文介绍了试验概况，分析了试验结果。  相似文献   

Palaeoenvironmental reconstruction from the last interglacial using phytolith analysis,southeastern North Island,New Zealand     

John A. Carter  Olav B. Lian 《第四纪科学杂志》2000,15(7):733-743

Phytoliths extracted from loess resting conformably on lacustrine sediments in southeastern North Island, New Zealand, provide a nearly continuous vegetation–climate record spanning the time period from the last interglacial (Marine Oxygen Isotope Stage 5) to the present. Phytoliths reveal changes in vegetation patterns following changes in climate. Correlation between tree–shrub phytolith fluctuations and the SPECMAP oxygen isotope curve, between Marine Oxygen Isotope Stages 1 and 5, suggest that changes in the ratio of arboreal to non‐arboreal phytoliths directly result from changes in climate. These data generally support the existing pollen and diatom record. This study confirms the usefulness of phytolith fossils for providing environmental and climate information from the Quaternary sedimentary record, especially in cases where the deposits contain no fossil pollen or diatoms. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

基于MAPGIS的柱状图系统设计与实现     

魏莲  卞州罡  卢建杰  许慧鹏  张亚琴 《地球科学》2006,31(5):743-746

柱状图表现的内容是和空间位置相关的, 基于GIS建立柱状图系统能清晰地表述地层间的空间位置关系.根据柱状图内容与图件表现形式, 对地质实体按照空间数据点、线、面格式进行描述, 采用面向对象的方法实现了对柱状图的数据组织; 系统基于MAPGIS实现, 根据数据属性与操作的不同, 建立不同的图道来表现数据; 对图件的界面操作进行了改善, 并提供模板制图功能, 实现了对地层单元的综合特征描述.   相似文献   

CTD与颠倒温度表、盐度计方法的系统比较     

宋文鹏  姜锡仁  鞠蓬 《海洋通报》2009,28(2)

2007年8月渤海及北黄海断面调台中使用ALEC CTD和颠倒温度表、盐度计获取同站同步断面水温、盐度和深度资料,并对调查结果进行差值和相关性分析,发现使用CTD与传统方式获取的调查数据绝对差值小,相关性强,可以认为经过了相关计量单位的标定后,CTD数据与颠倒温度表、盐度计数据可以一并使用.  相似文献