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101.
建立了测井多媒体数据库,论述了数据库的实现方法及动态复杂查询的实现,为进行测井数据查询提供了简便高效的途径。 相似文献
102.
Fragility curves express the probability of structural damage due to earthquakes as a function of ground motion indices, e.g., PGA, PGV. Based on the actual damage data of highway bridges from the 1995 Hyogoken‐Nanbu (Kobe) earthquake, a set of empirical fragility curves was constructed. However, the type of structure, structural performance (static and dynamic) and variation of input ground motion were not considered to construct the empirical fragility curves. In this study, an analytical approach was adopted to construct fragility curves for highway bridge piers of specific bridges. A typical bridge structure was considered and its piers were designed according to the seismic design codes in Japan. Using the strong motion records from Japan and the United States, non‐linear dynamic response analyses were performed, and the damage indices for the bridge piers were obtained. Using the damage indices and ground motion indices, fragility curves for the bridge piers were constructed assuming a lognormal distribution. The analytical fragility curves were compared with the empirical ones. The proposed approach may be used in constructing the fragility curves for highway bridge structures. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
103.
Malaria is one of the most widespread diseases in the world. Endemic malaria no longer occurs in many temperate zones as a result of social and economic improvement. At present malaria is the Third World's most dreaded killer. It kills over 1 million people and causes 300–500 million episodes of illness. In India, malaria-reported deaths have shown an upward trend. In 1955, a drive to eradicate malaria was launched in India. But after initial success it failed and malaria made a comeback. Malarial mosquitoes generally prefer unpolluted natural breeding sites but now they have adapted to the changed urban environment. In this paper, an attempt has been made to examine the occurrence of malaria and related environmental issues in a small town of India. Aligarh city, lying in the shadow of the country's capital New Delhi, was selected as a case study. Data were collected mainly from household surveys with the help of questionnaire interviews. About 2,185 households belonging to different income groups were sampled. The differences in the occurrence of malaria in the different income households (in 87% low, 69% lower-middle, 65% middle, 14% upper-middle, and 5% upper) suggest that most of these differences are related to the environmental conditions existing inside and outside their homes, such as poor drainage system, poor sullage disposal, open blocked drains, waterlogging and indoor water storage in open containers. Commitment both by the Government and local residents is needed to improve the environmental conditions and eradicate malaria. 相似文献
104.
Partitioning of heavy metals on soil samples from column tests 总被引:3,自引:0,他引:3
R. N. Yong W. Z. W. Yaacob S. P. Bentley C. Harris B. K. Tan 《Engineering Geology》2001,60(1-4):307-322
In this study, column tests were used to determine the retention capability of three types of estuarine alluvia collected adjacent to landfill sites in South Wales. Selective sequential extraction (SSE) was used to study the retention mechanisms of heavy metals in the soil columns obtained from leaching experiments. Acid digestion was later used to check the validity of the SSE results. Breakthrough curves show good retention of heavy metal ions (Pb, Cu, and Zn) by all soils, where almost 99% of heavy metals were retained with the Ce/Co values in the order of 10−3. The retention strength of these soils was observed to be constant up to five pore volumes (PV). This corresponds with the pH of the effluents and pore water of soil slices, which also show good buffering capacity against very acidic leachate up to 5PV. The heavy metal extraction profiles from SSE show very similar trends with the retention profiles from the leaching experiments, where heavy metals were retained mainly at the top part where the leachate entered the column. SSE indicates qualitatively that heavy metals precipitated with carbonates and amorphous materials (oxides/hydroxides) are higher than heavy metal retention via exchangeable mechanisms. The mass balance calculation gives range of deviation of 1–16% of the total soil extraction. The distribution of the heavy metals with various soil constituents are ranked in the following order: Carbonates>Amorphous oxides hydroxides>Organic matter>Exchangeable phases. 相似文献
105.
依据密度测井资料评估煤层的含气量 总被引:1,自引:0,他引:1
煤层甲烷长期以来认为是对采煤工作的危害,只是近十多年来才被认为是一种潜在的能源。煤层不仅是甲烷的储层,而且是甲烷的源岩。煤的物理结构是一种双重孔隙结构,即煤层中含有由基质孔隙和裂缝孔隙组成的孔隙系统。煤层中的气(甲烷)主要吸附在基质孔隙的内表面,是吸附气,而不是存在于骨架粒间的孔隙空间内,因而传统的评价天然气储层含气量的方法虽然不能适合于评估煤层的气含量。本文利用密度测井资料和煤样煤质化验资料确定 相似文献
106.
应用电场理论研究混合物的电性,得出了混合物的电导率公式和介电常数公式.这一结果表明:混合物的电导率决定于混合物各成分电导率的均值和方差;混合物的介电常数决定于混合物各成分介电常数的均值和方差.作为所得结果的应用,给出了岩石的电导率公式和介电常数公式. 相似文献
107.
108.
核测井曲线高分辨率处理技术及其应用 总被引:1,自引:0,他引:1
着重探讨了放射性测井曲线中自然伽马测井曲线、补偿中子测井曲线和补偿密度测井曲线的高分辨率处理方法及其应用效果。对于自然伽马及自然伽马能谱测井曲线,采用反褶积技术和有效的噪音压制技术;对于补偿中子测井曲线和补偿密度测井曲线采用了改进的α因子法。可以发现:高分辨率处理技术可明显地改善有关曲线的纵向分层能力;处理后的曲线与岩心柱状图及与微球、微电极等高分辨率曲线进行对比,其相关性有很大的改善;应用高分辨率处理后的曲线求薄层的泥质含量等参数,其相对误差明显下降。 相似文献
109.
已建立的几种有效测井找气方法,在我国天然气勘探开发中应用,发现了许多气层.本文综述这几种有效的测井找气方法,并给出了实例. 相似文献
110.
关于大地电磁的静校正问题 总被引:16,自引:0,他引:16
本文从理论上严格地论述了大地电磁测深曲线静态位移的原理,简单介绍了目前国内外所采用的静校正方法,并着重分析了我们所用的压制表层电性不均匀干扰的办法及其效果。 相似文献