米仓山新元古代岩浆岩省--一个潜在的Rodinia重建方案验证地区     

程建萍  凌文黎 《地质科技情报》2000,19(3):12-16

总结了对Ｒｏｄｉｎｉａ超大陆修正方案验证研究的方向和趋势;结合我国造山带研究现状和扬子北缘米仓山新元古代岩浆岩省地质特征,分析了其在Ｒｏｄｉｎｉａ重建方案验证研究中的重要意义,并指出了开展相关工作的研究方向。  相似文献   

核素迁移的示踪试验研究综述     

刘平辉  黄国夫  管太阳  王勇  刘晓东  余运祥 《华东地质学院学报》2000,23(2):91-94

按地下实验室或处置库的不同主岩,简述了以花岗岩,岩盐,粘土岩和凝灰岩等作处置库主岩的核素迁移示踪试验的研究现状,重点介绍了以花岗岩作高效废物处置库主岩的示踪试验方法和进展。  相似文献   

高应变检测技术在预制桩检测工作中的应用   总被引：1，自引：1，他引：0  

郑展鹏 《水文地质工程地质》2000,27(5):58-60

高应变检测技术应用于桩基质量检测工作中。经过几年的实践,积累了一些曲线解释经验。．表明高应变检测技术应用于检测预制桩桩身完整性及桩基承载力,有其自身的优点。  相似文献   

基于假设检验的地震动强度(烈度)速报方法   总被引：3，自引：0，他引：3  

王玉石  周正华  王伟 《地震工程与工程振动》2008,28(5)

地震发生后数分钟内,快速、可靠地判别出地震动强度(烈度)的空间分布,用以估计不同地区的受灾程度,可以为政府开展应急救援并合理分配救援力量提供决策依据,保证救援人员及时、准确地到达极震区并展开搜救,以减少生命财产损失。本文基于统计学中的假设检验方法,对历史震害资料进行统计,提出了一种利用强地震动参数判别地震动强度(烈度)的方法。比较结果表明,本方法所确定的地震动强度(烈度)与实际震害烈度对应较好,能较真实地反映实际震害情况。  相似文献   

数字城市的三维图形构建技术   总被引：6，自引：1，他引：5  

彭国均池天河  唐丽玉舒娱琴 《地球信息科学学报》2003,5(1):84-89

城市是一个复杂的人文与自然的复合系统,是人口、资源、环境和社会经济要素高度密集的地理综合体,数字城市是数字地球应用的一个重要方向,而数字城市的三维图形构建是数字城市建设的重要内容之一。本文从技术应用角度出发,综合多方的研究成果,简单阐述了数字城市的三维图形构建技术和基本思路。  相似文献   

裂隙岩石单轴压缩损伤扩展细观机理CT分析初探   总被引：5，自引：0，他引：5  

任建喜  惠兴田 《岩土力学》2005,26(Z1):48-52

完成了单一裂纹的裂隙砂岩单轴压缩条件下细观损伤破坏机理CT实时试验,得到了裂纹萌生、发展、宏观裂纹形成、破坏等各阶段的CT图像、CT数和CT数方差。结果表明,与无预制裂隙的岩石试样相比,已有预制裂纹对新的裂纹的起裂位置及贯通性宏观破坏裂纹的形成具有重要影响,预制裂纹的存在导致裂隙砂岩试样的扩容量大于完整试样破坏时的扩容量。  相似文献   

混凝土灌注桩的跨孔超声波检测方法研究   总被引：2，自引：0，他引：2  

林梁  黄真萍 《岩土力学》2005,26(Z1):99-102

通过对跨孔超声波检测方法的理论探讨,结合工程实例,利用声波曲线判定桩身混凝土质量及缺陷的可疑位置,并采用PSD判据法进行辅助分析,从而达到判别桩身缺陷性质及范围的目的。实践证明,采用跨孔超声波法检测混凝土灌注桩桩身质量,其结果直观可靠,为桩身混凝土质量提供了一种有效的检测方法。  相似文献   

The seeing at the William Herschel Telescope     

R. W. Wilson  N. O'Mahony  C. Packham  M. Azzaro 《Monthly notices of the Royal Astronomical Society》1999,309(2):379-387

We present results from a study of the seeing quality at the 4.2-m William Herschel telescope at La Palma. The median intrinsic seeing at the site is found to be excellent, and is comparable to that at the Paranal and Mauna Kea observatories. Contributions to the seeing from turbulence within the telescope dome are insignificant. Furthermore, the optical quality and tracking stability of the telescope are good, so that long-exposure image widths close to the limit imposed by the site seeing can be expected.  相似文献   

Gravitational waves: The future of black hole physics     

B. S. Sathyaprakash 《Journal of Astrophysics and Astronomy》1999,20(3-4):211-220

The new millennium will witness the operation of several long-baseline ground-based interferometric detectors, possibly a space-based detector too, which will make it possible to directly observe black holes by catching gravitational waves emitted by them during their formation or when they are perturbed or when a binary consisting of black holes in-spirals due to radiation reaction. Such observations will help us not only to test some of the fundamental predictions of Einstein's general relativity but will also give us the unique opportunity to map black hole spacetimes, to measure the masses and spins of black holes and their population, etc.  相似文献   

Regional characterisation of hydraulic properties of rock using air-lift data     

David Wladis  Gunnar Gustafson 《Hydrogeology Journal》1999,7(2):168-179

 Hydrogeologic studies are commonly data-intense. In particular, estimations of hydraulic properties of hard rock often require large amounts of data. In many countries, large quantities of hydrogeologic data have been collected and archived over the years. Therefore, the use of existing data may provide a cost-efficient alternative to collecting new data in early stages of hydrogeologic studies, although the available data may be considered imprecise. Initially, however, the potential usefulness, i.e., the expected accuracy, of the available data in each specific case must be carefully examined. This study investigates the possibilities of obtaining estimates of transmissivity from hard-rock air-lift data in Sweden within an order of magnitude of results obtained from high-quality injection-test data. The expected accuracy of the results was examined analytically and by means of statistical methods. The results were also evaluated by comparison with injection-test data. The results indicate that air-lift data produce estimates of transmissivity within an order of magnitude compared to injection-test data in the studied examples. The study also shows that partial penetration and hydrofracturing may only affect the estimations approximately half an order of magnitude. Thus, existing data may provide a cost-efficient alternative to collection of new data in early stages of hydrogeologic studies. Received, January 1998 Revised, November 1998, December 1998 Accepted, December 1998  相似文献