Identification of normalization factors for quantitative real-time RT-PCR analysis of gene expression in Pacific abalone Haliotis discus hannai     

邱礽  孙铂光  房沙沙  孙黎  刘晓 《中国海洋湖沼学报》2013,31(2):421-430

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肖凡  张为民  张松堂  张宏伟 《大地测量与地球动力学》2013,33(4):44-47

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王建强  李建成  赵国强  徐效波 《大地测量与地球动力学》2013,33(4):52-55

???ó??????????????EGM2008???????ι?????????????÷?ζ??????????????????????????????????????????η???????????????????????????????洢???????????????????????÷?ζ??????????????????????????????????????3??????????????洢??????100??????????  相似文献   

气候变化背景下珠江流域极端洪水事件的变化趋势     

吴志勇  陆桂华  刘志雨  王金星  肖恒 《气候变化研究进展》2012,8(6):403-408

根据1951-2010年珠江流域23个典型断面流量资料,用P-III型分布曲线拟合洪水系列进行频率计算,分析了珠江流域极端洪水事件的变化趋势。结果表明：1980年以来,珠江流域极端洪水事件发生的频次明显增加,尤其是自1990年以来增加趋势显著;1981-2010年较1951-1980年珠江流域约70%典型断面极端洪水事件呈增加趋势,主要分布在西江、北江、粤西;而近30%的典型断面呈减少趋势,主要分布在东江和桂南。  相似文献   

An Accurate Method of Computing the Gradient of Seismic Wave Reflection Coefficients (SWRCs) for the Inversion of Stratum Parameters     

Xiao-Bo Liu  Fu-Ping Liu  Xian-Jun Meng  Jia-Qi Xiao 《Surveys in Geophysics》2012,33(2):293-309

The optimization inversion method based on derivatives is an important inversion technique in seismic data processing, where the key problem is how to compute the Jacobian matrix. The computational precision of the Jacobian matrix directly influences the success of the optimization inversion method. Currently, most of the AVO (amplitude versus offset) inversions are based on approximate expressions for the Zoeppritz equations to obtain the derivatives of the seismic wave reflection coefficients (SWRCs) with respect to the stratum parameters. As a result, the computational precision and range of applications of these AVO inversions are restricted undesirably. In order to improve the computational precision and to extend the range of applications of AVO inversions, the partial derivative equations of the Zoeppritz equations are established, with respect to the ratios of wave velocities and medium densities. By solving the partial derivative equations of the Zoeppritz equations accurately, we obtained the partial derivative of SWRCs with respect to the ratios of seismic wave velocities and medium densities. With the help of the chain rule for derivatives, the gradient of the SWRCs can be accurately computed. To better understand the behavior of the gradient of the SWRCs, we plotted the partial derivative curves of the SWRCs, analyzed the characteristics of these curves, and gained some new insight into the derivatives. Because only a linear system of equations is solved in our method without adding any new restrictions, the new computational method has both high precision and a quick running speed; it is not only suitable for small incident angles and weak reflection seismic waves but also for large incident angles and strong reflection seismic waves. With the theoretical foundations established in the article, we can further study inversion problems for layered stratum structures and we can further improve the computational speed and precision of the inversions.  相似文献   

太钢防震观测站大地电场观测系统运行评价     

刘永强  郭宏杰  王啸  郑康 《山西地震》2012,(4):33-36

从地电场观测原理出发,在概要分析地电场观测系统的基础上,着重介绍太钢防震观测站ZD9A地电场观测系统的运行状况,并对地电场观测数据进行相应的分析。表明,太钢防震观测站地电场观测系统运行稳定可靠,可为地震前兆研究提供相应信息。  相似文献   

南京基准地震台与中国地震台网测定体波震级对比分析   总被引：2，自引：2，他引：0  

殷翔  徐志国  任枭  孙丽  陈宏峰 《地震地磁观测与研究》2012,33(2):21-26

以中国地震台网测定的综合体波震级为标准震级,采用正交回归方法,得到南京测震台（NJ2）体波震级与标准体波震级之间的关系式,并对震级偏差与震级大小、震中方位和震中距关系进行偏差分析,为台站分析人员提供指导.  相似文献   

丹徒苏18井水位微动态特征     

孟科  杨从杰  肖飞  鲍海英 《地震地磁观测与研究》2012,33(3):105-109

根据井区区域地质构造及水文地质环境,研究丹徒苏18井的水位动态特征,着重分析气压、固体潮、降雨荷载效应与水位变化的关系。因近年井区周边观测环境有所改变,进而探讨环境改变后降雨荷载对水位观测产生的影响。  相似文献   

祁连山西段测震指标异常综合应用     

苏宏伟  肖淑娟 《地震地磁观测与研究》2012,33(5):30-34

通过对1980年以来至今14个指标的全时间扫描,并使用祁连山西段地区Ms5．0地震进行对应。结果表明,选取A值、AC值、A（b）值、b值、Mf值和地震活动度S值进行同步异常分析,能显著提高祁连山西段地区的有震报震率,但有漏报。对目前地区异常集中区进行时间扫描,结果显示,祁连山西段地区出现同步异常,认为2012年或稍长时期有发生Ms≥5．0中强震的可能。  相似文献   

鄂尔多斯盆地上古生界碎屑岩相对高渗储集层成因及分布^*          下载免费PDF全文

肖红平  刘锐娥  李文厚  张福东  张春林  郝爱胜  缪卫东 《古地理学报》2012,14(4):543-552

鄂尔多斯盆地上古生界发育 “粒间孔型石英砂岩”、“溶孔型石英砂岩”、“粒间孔—溶孔复合型长石砂岩”3类相对高渗储集层。结合鄂尔多斯盆地地质背景,分析了该地区上古生界3类相对高渗储集层的岩石结构、组分与物性等基本特征,详细探讨了沉积环境、成岩作用、构造活动对鄂尔多斯盆地上古生界各类相对高渗储集层形成的控制机理,并在此基础上,依据与物源的距离、沉积相类型及砂体分布、孔隙类型、颗粒成分及粒度粗细、杂基成分及含量、储集层最大埋深、后期构造运动等因素,对主力勘探层系山西组二段和下石盒子组八段进行了储集层优劣分级综合评价,认为受高石英含量母岩控制的沉积体系、辫状河高能沉积相带和强溶蚀、弱压实的有利成岩相带分布区是鄂尔多斯盆地上古生界碎屑岩相对高渗储集层的主要发育区域。  相似文献