“妈妈,让我看看这本书”     

李全会 《河南地质》2011,(2):52-52

坐在办公室里,我翻开手边的《地质旅游》。忽然,我不禁笑了,回想起前几天发生的事来。 那是一个寒冷的下午。晚饭后,我拿起一本《地质旅游》随便翻看。  相似文献   

“热线”为群众排忧解难     

任全会  胡伟亮 《河南地质》2011,(5):28-28

4月13日早上7：40～8：10是民权县国土资源局在县广播电台＂政风行风＂热线节目上线时间。像往常一样,县国土资源局局长伏思虎、副局长董洪亮走进了直播间,接听热线电话。  相似文献   

Drill cutting accumulations in the Northern and Central North Sea: a review of environmental interactions and chemical fate     

Breuer E  Stevenson AG  Howe JA  Carroll J  Shimmield GB 《Marine pollution bulletin》2004,48(1-2):12-25

The exploration and production of North Sea oil and gas reserves has resulted in the accumulation of large quantities of drill cuttings on the seabed surrounding drill sites. This complex mixture of man-made and natural substances contains higher concentrations of certain metals (Ba, Cr, Cu, Ni, Pb, and Zn) and hydrocarbons than are observed in background sediments. With decommissioning of older platforms underway, an evaluation of the environmental interactions and chemical fate of the drill cuttings accumulations is required.This review concentrates on contaminants within drill cutting accumulations in the Northern and Central North Sea (56 degrees N-62 degrees N). Present literature reviewed reveals that hydrocarbons within the cuttings piles remain relatively unchanged with time. A considerable proportion of the associated contaminants are likely to remain within the cuttings pile unless they are disturbed which will then increase exchanges of porewater and solids back to the seabed surface resulting in pathways of exposure for organisms.  相似文献   

Contamination of marine biogenic habitats and effects upon associated epifauna     

Roberts DA  Johnston EL  Poore AG 《Marine pollution bulletin》2008,56(6):1057-1065

Habitat-forming organisms are frequently used as biomonitors in marine environments due to a widespread ability to accumulate toxic contaminants. Few studies, however, have considered the consequences of these accumulated contaminants on the abundant and diverse fauna associated with these habitats. In this review, we summarize research which has investigated the contamination of biogenic habitats (including seagrasses, macroalgae, ascidians, sponges and bivalve reefs) and the impact of this contamination on the habitat use, feeding behaviour and survival of associated epifauna. In many cases, ecological impacts upon epifauna are not simply predicted by levels of contamination in their habitat, but are determined by the foraging, feeding and reproductive behaviours of the inhabiting organisms. Thus, a thorough understanding of these ecological processes is essential in order to understand the effects of contaminants upon epifaunal communities. The scope of biomonitoring studies which assess the contamination of biogenic habitats should be expanded to include an assessment of potential effects upon associated epifauna. When combined with manipulative field experiments such an approach would greatly assist in our understanding of indirect effects of contaminants in these important benthic habitats.  相似文献   

深水沉积体系：21世纪的新模式     

Stow  DA 丰全会 《海洋地质前沿》2000,16(5):17-19

深水浊流层和相关体系已发现和投产的油气田估计有１２００～１３００个 ,由于缺乏俄罗斯、前苏联和中国的有价值的公开资料 ,这个数字带有不确定性。Ｐｅｔｔｉｎｇｉｌｌ（１９９８）从５４个盆地中已证实了其中的９２５个油田（包括碳酸盐型的） ,有４３个属大油田（＞５００ｍｂ）。这些浊流层油田的大部分是象加利福尼亚、北海和渤海湾这样的高产区 ,它们存在于大陆之下或浅陆架水域之下。早期的大油田主要是位于会聚型／斜交会聚型边缘盆地中 ,而后期的主要位于发散边缘盆地 ,包括墨西哥湾、坎波斯、尼日尔三角洲、下刚果／安哥拉和西…  相似文献   

印度尼西亚东部原油的地球化学特征     

Peters  K 丰全会 《海洋地质前沿》2000,16(3):11-13

在亚洲 -澳大利亚东南地区 ,总体估计的石油总回收率约达１２５０亿桶油当量（ＢＯＥ）（其中５００亿桶油 ,１２５兆立方英尺天然气）。这个大区域的石油系统受古生代和早中生代冈瓦纳的主构造解体控制。我们在印度尼西亚东部的研究区位于欧亚板块上以第三系为主的石油系统和印度尼西亚 -澳大利亚板块上以古生界—中生界为主的石油系统之间。在我们进行研究之前 ,研究区许多原油的相互关系是未知的。这次地球化学研究的目的是应用高分辨率地球化学方法评估这些油气的成因关系、油源岩的年代和古环境以及它们的相对热成熟度和生物降解程度 ,…  相似文献   

用神经网络建立未知结构系统模型     

Chas.  AG 赵国兴 《世界地震工程》1994,(2):63-67

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地震预报步入成年     

Linoh  AG 王大宏 《世界地震译丛》1992,(3):61-66

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Studies of dust grain properties in infrared reflection nebulae     

Pendleton YJ  Tielens AG  Werner MW 《The Astrophysical journal》1990,349(1):107-119

We have developed a model for reflection nebulae around luminous infrared sources embedded in dense dust clouds. The aim of this study is to determine the sizes of the scattering grains. In our analysis, we have adopted an MRN-like power-law size distribution (Mathis, Rumpl, and Nordsieck) of graphite and silicate grains, but other current dust models would give results which were substantially the same. In the optically thin limit, the intensity of the scattered light is proportional to the dust column density, while in the optically thick limit, it reflects the grain albedo. The results show that the shape of the infrared spectrum is the result of a combination of the scattering properties of the dust, the spectrum of the illuminating source, and foreground extinction, while geometry plays a minor role. Comparison of our model results with infrared observations of the reflection nebula surrounding OMC-2/IRS 1 shows that either a grain size distribution like that found in the diffuse interstellar medium, or one consisting of larger grains, can explain the observed shape of the spectrum. However, the absolute intensity level of the scattered light, as well as the observed polarization, requires large grains (approximately 5000 angstroms). By adding water ice mantles to the silicate and graphite cores, we have modeled the 3.08 micrometers ice band feature, which has been observed in the spectra of several infrared reflection nebulae. We show that this ice band arises naturally in optically thick reflection nebulae containing ice-coated grains. We show that the shape of the ice band is diagnostic of the presence of large grains, as previously suggested by Knacke and McCorkle. Comparison with observations of the BN/KL reflection nebula in the OMC-1 cloud shows that large ice grains (approximately 5000 angstroms) contribute substantially to the scattered light.  相似文献   

砖房震陷计算分析   总被引：2，自引：0，他引：2  

石兆吉  丰万玲 《地震工程与工程振动》1991,11(1):89-98

本文就4～6层砖房的震陷进行了计算分析,着重研究烈度、软土层厚度和层位的影响,确定了可不考虑震陷影响的临界值和加固范围。  相似文献