EFFECT OF SHAPE ON INCIPIENT MOTION OF SEDIMENT PARTICLES

IINTRODUCTIONItisveryoftentoobservegravelpericlesinformofimbricateclustersonmountainousriverbeds.Theparticleassemblagesareonaveragethreetosixparticlesinlengthandformassingle,highlyimbricatedlongitUdinalthreads.Theyneednotconsistofthelargestmaterialonthebed,eventhoughthisispredominantlythecase(DeJongandErgenzinger,1995).Theyaredifferentiatedintermsofshape,numberandarrangementofparticles,butmostlythelengthandthewidthoftheparticlesareafewtimesofthethickness.Willettsetal.(1982)investigatedt…     

巴伦支海-喀拉海油气区的地质演化-俄罗斯自然资源部全俄地质研究所、挪威地质研究所，挪威石油管理局，挪威海德罗石油公司共同参与的综合研究项目

GeoBase项目的主要目标是创建巴伦支海和喀拉海油气区的构造地层和古地理模式。该项目应用了俄罗斯和挪威已有的地质、地球物理数据和各学科的综合解释成果,包括潜在油气区的资料、布置适当的地震测线,再用深、浅钻孔资料和周围的露头做校正,等等。本次研究建立了巴伦支海、北伯朝拉地区和喀拉海大地构造、地质结构和古地理格架。这项综合性研究至关重要,是了解油气源岩和潜在储层空间分布的科学方法,又是鉴别巴伦支海油气成藏的基础。     

AAA-07俄罗斯-挪威在巴伦支海地区的科学合作项目：巴伦支海地区新生代砂质系统

该项目的主要目标是开发巴伦支海新生代砂岩系统的沉积模式,以便更好地鉴别和定量研究影响储层位置和分布的关键因素。研究方法为综合挪威北部Andcya近海现代砂岩系统的形状、来源和发育情况,分析研究巴伦支海大陆边缘新生代沉积楔的砂岩系统。     

Slope stability FEM analysis and retaining wall design：a case study of clinker in Benxi of Liaoning

Stability is always the most important problem after high slope was excavated. The study analyzed the stress and strain inside the slope by Finite Element Method （FEM） and carried through stress distribution and failure zone, then analyzed the stability of the slope using three different methods and came to the conclusion that it is in unstable condition, so the designed retaining wall was put forward which makes the slope stable.     

H2 PRODUCTION BY ANABAENA VARIABILIS MUTANT IN COMPUTER CONTROLLED TWO-STAGE AIR-LIFT TUBULAR PHOTOBIOREACTOR

ＩＮＴＲＯＤＵＣＴＩＯＮＨ2,ａｓａｎｏｎｐｏｌｌｕｔｉｎｇｆｕｅｌ,ｓｅｅｍｓｔｏｂｅａｐｒｅｆｅｒａｂｌｅａｌｔｅｒｎａｔｉｖｅｅｎｅｒｇｙｓｏｕｒｃｅｏｆｔｈｅｆｕｔｕｒｅ.Ｓｔｕｄｙｏｎｂｉｏｈｙｄｒｏｇｅｎ,ｃｏｖｅｒｉｎｇｇｅｎｅｔｉｃ,ｐｈｙｓｉｏｌｏｇｉｃａｌａｎｄｂｉｏｃｈｅｍｉｃａｌａｓｐｅｃｔｓ,ｈａｓｂｅｅｎａｃｔｉｖｅｌｙｐｕｒｓｕｅｄｉｎｔｈｅｌａｓｔ100ｙｅａｒｓ,ｉｎｔｈｅａｔｔｅｍｐｔｔｏｐｒｏｄｕｃｅｒｅｎｅｗａｂｌｅＨ2,ｐａｒｔｉｃｕｌａｒｌｙｒｅｎｅｗａｂｌｅ“ｓ…     

对《中国国家自然地图集》的评价

1999年出版了中国国家自然地图集,它是反映中国自然、社会、历史、经济和文化系列国家地图集的一部分。该图集用中(2500册)英(1000册)文出版。中国国家自然地图集的工作在1956年由周恩来总理直接领导编制的“科学发展十二年规划”中就开始了。于1958年开始图集的设计工作。按设计要求,图集由四卷组成:即普通地图集、自然地图集、历史地图集、经济地图集。1965年出版了中华人民共和国自然地图集。普通地图集没有全部完成,于1969年出版了“中华人民共和国分省地图”。     

内生金矿床的成因：基本模式

金矿床以具有仅限于某一类金矿床的典型矿物组合（金－黄铁矿－毒砂；金－多金属－硫化物；金－碲化物；金－辉锑矿；金－辰砂）之一为特征。特征的矿物组合主要受沉淀环境的ＰＨ值和温度变化的控制。具有前３种矿物组合的金矿物的金矿床起源于花岗岩类或岩浆体系有关的流体，具有后２种矿物组合的金矿床起源于壳下非岩浆流体。     

Transfer and distribution of lead in the asteroid Asterias rubens following ingestion of contaminated food: a radiotracer study

A radiotracer technique using 210Pb was applied to quantify the transfer and distribution of lead in the asteroid Asterias rubens following a single ingestion of radio-labelled mussels under controlled laboratory conditions. Approximately 50% of the 210Pb accumulated by mussels in their soft tissues from seawater was transferred to the asteroid through the food pathway resulting in a transfer factor less than unity. Loss kinetics of 210Pb in the asteroid were best described by a two-component exponential model. A. rubens eliminated 56% +/- 5% of the ingested 210Pb in a few days while the remaining fraction (42% +/- 5%), was absorbed and eliminated very slowly. Following ingestion, 210Pb was accumulated in the pyloric caeca and the body wall with little radioisotope found in the coelomic fluid. Lead-210 was then transferred to the organic matrix of the body wall through the general body cavity via the coelomic fluid, and then to the skeleton. In this way, lead appears to be progressively eliminated from the organic matrix of the body wall while it is efficiently trapped in the calcite skeleton. The sequestration and retention of lead in the skeleton is considered as a detoxification process, but it also prevents lead transfer to higher trophic levels of the marine food chain since the skeleton is not digested by higher consumers. In addition, the skeleton of asteroids can be regarded as a bioindicator of long-term dietary lead contamination.