层间剪切带抗剪强度评价：以清江高坝洲为例   总被引：1，自引：0，他引：1  

肖裕行  肖树芳 《水文地质工程地质》1995,22(2):35-39

本文首先提出了层间剪切带抗剪强度评价中，如何由少数试验点成果和模型定量评价结果，扩充到整个面的抗剪强度参数的捷径方法．之后，结合清江高坝洲坝基层间剪切带横向特征，对层间剪切带在横向上的发育方式进行了划分，同时对肖树芳等人已建立的层间剪切带抗剪强度定量评价的模糊综合评判模型稍加补充．然后，以层间剪切带横向发育方式为基础．结合已有的试验成果和模型评价结果，对清江高坝洲坝基中可能危及大坝稳定性的７条层间剪切带的抗剪强度加以了评价．  相似文献   

滇西北伸展构造区的构造特点及其动力学研究   总被引：1，自引：0，他引：1  

韩竹君  徐杰  虢顺民  杨主恩  向宏发  吴大宁 《中国地震》1993,(2)

本文研究了滇西北伸展构造区活动构造、地震活动和新构造环境的特点。该区构造与地震的活动强度为南、北部强,中间弱;第四纪最大沉降中心、湖积台地及第四纪褶皱分布呈对角对称。滇西北地区的伸展构造是在近南北向挤压力和南西—北东向剪切力的共同作用下形成的,其合力方向为北北东,与用水压致裂法和物理模拟获得的结果相符。该区在形成机制上属于一种特殊的拉分构造。  相似文献   

基于GSM短消息通信的气象信息电子屏方案   总被引：4，自引：0，他引：4       下载免费PDF全文

齐军岐 《陕西气象》2006,(2):41-42

传统气象警报广播方式存在诸多弊端,如专用接收机厂家已不再生产,广播发射需要投入大量的人力和财力,覆盖面有限,经济效益不明显等,这种服务方式在陕西已经基本淘汰。积极开拓电子显示屏等新型气象服务手段势在必行。中国气象局提出,“不断完善广播、电视、报纸、短信、121声讯  相似文献   

Impact of Topography and Land-Sea Distribution on East Asian Paleoenvironmental Patterns     

张仲石  王会军  郭正堂  姜大膀 《大气科学进展》2006,23(2):258-266

Much geological research has illustrated the transition of paleoenvironmental patterns during the Cenozoic from a planetary-wind-dominant type to a monsoon-dominant type, indicating the initiation of the East Asian monsoon and inland-type aridity. However, there is a dispute about the causes and mechanisms of the transition, especially about the impact of the Himalayan/Tibetan Plateau uplift and the Paratethys Sea retreat. Thirty numerical sensitivity experiments under different land-sea distributions and Himalayan/Tibetan Plateau topography conditions are performed here to simulate the evolution of climate belts with emphasis on changes in the rain band, and these are compared with the changes in the paleoenvironmental patterns during the Cenozoic recovered by geological records. The consistency between simulations and the geological evidence indicates that both the Tibetan Plateau uplift and the Paratethys Sea retreat play important roles in the formation of the monsoon-dominant environmental pattern. Furthermore, the simulations show the monsoon-dominant environmental pattern comes into being when the Himalayan/Tibetan Plateau reaches 1000–2000 m high and the Paratethys Sea retreats to the Turan Plate.  相似文献   

电子信息网络系统配电的重复接地问题   总被引：1，自引：0，他引：1  

刘翠芝  卢友发刘林 《河南气象》2006,(4):67-67

目前我国的低压供配电方式多采用TN接地形式，而国标要求电子信息网络系统应采用TN-S或TN-C-S制式，因此电子信息网络系统的配电方式需要进行改造。在低压供电线路中增加一接地端子与PEN短接，即为重复接地，转换成三相五线制供电。  相似文献   

进入欧洲     

军 《地图》2007,(2):120-120

坐法航的班机是一次愉快的经历。此刻,我睡过一觉,到机上酒吧喝过饮料,开始准备写一点什么了。我把面前的屏幕选择到飞行数据一栏里。  相似文献   

浅谈多传感器信息融合技术     

徐华中  吴苏 《华东地质学院学报》2007,30(2):189-192

多传感器信息融合广泛应用于自动目标识别、战场监视、机器人、工业过程控制、遥感、图象处理、模式识别等领域。介绍了多传感器信息融合技术的概念、原理、功能模型,其融合方法主要介绍了Dempster-Shafer证据理论(D-S证据理论),由于D-S证据理论存在处理大量不确定的系统估计问题的特性,可以将其应用于势态估计问题。  相似文献   

Discussion of Some Problems in the Research into the Seismotectonics of Strong Earthquakes on the North China Plain     

Jiang Wali 《中国地震研究》2007,21(2):130-138

The tectonic characteristics and research problems of five earthquakes with M≥7.0 on the North China Plain over the last 300 years are addressed in the paper, including the cognition that there were no ground fractures in the 1966 Xingtai earthquake, the question caused by the thrust activity of the seismic fault of the Tangshan Earthquake and the discussion of the seismotectonic environment of the 1830 Cixian earthquake and the 1937 Heze earthquake. The author thinks that the main reason for the problems in research of strong earthquake tectonics in the region is that the status of activity of the main tectonics during the Late Quaternary are unknown. This affects the founding of discrimination criteria for seismotectonics of strong earthquakes on the North China Plain. Discriminating the Holocene active faults from the large number of faults is the most effective method for seismic hazard assessment in the area in future.  相似文献   

带保温层管道腐蚀状态的X射线检测方法研究     

原培新  牛艳平 《CT理论与应用研究》2007,16(3):36-42

随着无损检测技术的飞速发展,X射线实时成像技术获得了广泛的应用.本文论述了带保温层管道的X射线实时成像检测方法,重在对管道腐蚀缺陷深度如何定量的实验方法研究,和管道缺陷处厚度与图像灰度的数学模型建立,从而对管道腐蚀厚度进行定量,管道缺陷的定量研究有助于管道安全运行的评价和隐患问题的及时发现.  相似文献   

Predicting the distribution of thin bed reservoirs by broad frequency band seismic   总被引：5，自引：1，他引：5  

李子顺  郭学斌 《应用地球物理》2007,4(2):118-126

Recognition of thin interbedded reservoirs in the middle-shallow strata in the Songliao Basin is a great difficulty. In order to resolve this problem, we present a technique for predicting the distribution of thin reservoirs using a broad frequency band and ultra high resolution seismic. Based on forward modeling, we recognized that a thin bed seismic reflection is characterized by changing amplitude with changing frequency （amplitude versus frequency, AVF）. We calculate the thickness of thin reservoirs from their AVF characteristics and predict the distribution of thin bed reservoir using broad frequency band and ultra high resolution seismic. The technique has been applied in the 3D seismic area of Zhaoyuan in the northern part of the Songliao Basin. The seismic resolution is increased by two or three times over that of conventional seismic and many thin reservoirs have been identified. The technique has extensive application to the exploration and development of oil and gas, such as optimizing the location of exploration wells, the design of wells （especially horizontal wells）, choice of production test layers, analyzing reservoir continuity in development wells, and so on.  相似文献