地体学说的兴起及其意义

一、地体学说产生的背景自七十年代初期以来,随着大陆边缘构造研究的沉入开展和古地磁学方法的广泛使用,在北美科迪勒拉地区产生了构造地层地体(Tectonstratigraphic terrane)理论。这一学说的出现,引起了地质学家们的关注和兴趣。美、加、日等国学者共同努力,很快使研究工作扩展到了北起阿留中群岛,南至南极大陆的整个环太平洋地区。在原来认为均一的构造岩相带中,识别出了大小不等、性质不同的许多地体,成功地解释     

南太平洋上的副热带急流

文章的主要目的是要对存半年澳大利亚－南太平洋区域副热带对流层上层的西风最大区有一个更好的了解，过去的论文表明它的出现具有１－２周的周期性。该文的重点在于对前面提到的西风最大区的加速阶段中热带和温带强迫的相对重要性作一个定量分析。向外长波辐射，风数据以及分解为旋转和辐射分量的动能收支平衡，被用来探讨１９８５－１９８９年 夏季时段中强迫机制的重要性，制定了判据，用来判定纬向风的强加速阶段。总共找出４０     

Contaminant concentrations, biochemical and hematological biomarkers in blood of West Indian manatees Trichechus manatus from Brazil

The West Indian manatee Trichechus manatus is threatened with extinction in Brazil, and this study focused on nondestructive blood samples analyzed for metals, polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs), as well as biochemical and hematological biomarkers. Studied manatees were kept at Projeto Peixe-Boi headquarters in Pernambuco State, and at two natural areas in estuaries where they are released to the wild. Manatees kept at the natural estuary in Paraiba State have blood concentrations of Al, Pb, Cd, Sn that are 11, 7, 8 and 23 times greater, respectively, than the concentrations found in blood of animals from the same species in Florida, USA. An inhibition of butyrylcholinesterase in manatees kept at the two reintroduction sites in Alagoas and Paraiba States indicated possible exposure of the animals to cholinesterase inhibitor insecticides. PCBs and OCPs were not detected. Results from this study will help delineate conservation efforts in the region.     

Use of electrophoresis for transporting nano-iron in porous media

Research has been conducted to evaluate if electrophoresis could transport surface stabilized nanoscale zero-valent iron (nZVI) through fine grained sand with the intent of remediating a contaminant in situ. The experimental procedure involved determining the transport rates of polymer modified nZVI and hematite in fine grained sands under an applied electrical gradient under different physical and chemical conditions. Results indicated transport of polymer modified nZVI and hematite can be accomplished by electrophoresis, with rates found to be much higher than diffusion alone and comparable to those predicted by electrokinetic theory. This study indicates there is potential for this method to deliver polymer modified nZVI into contaminated zones within fine grained sands for the purpose of remediation.     

华南板块的若干最新古地磁数据

众所周知,华南板块的古地磁研究存在如下问题.1.由于国内尚不具备超导磁测条件,因此,弱磁性碳酸盐岩地区的研究受到了阻碍.2.由于前寒武纪的变质、变形等地质问题比较复杂,因此,6亿年前的古地磁数据严重缺乏.在校内基金资助下,我们在属于华南板块的湖北省京山县境内(30°55′~31°19′N;113°O1′~113°18′E)碳酸盐岩分布较为广泛的地区,自中元古代起,经由古生代、中生代,一直到新生代的第四纪止,进行了按地质时代时序的系统采样,并在日本神户大学低温弱磁测定实验室使用灵敏度为10_(-11)Am~2的超导磁力仪对所有标本进行了古地磁测定.今将结果简报如下.     

对中国大别山地区地体构造的初步探讨

本文依据大别山地区沉积特征、古生物特征、岩浆活动、变质作用及构造特征的不同,认为本区存在有各自独立的大别地体、随县-应山地体和北淮阳地体,这些地体之间以巨大的深断裂为界,它们拼贴于华北古陆和扬子古陆之间。本文初步探讨了这三个地体各自的构造演化历史,认为大别地体和随-应地体可能属外来地体,而北淮阳地体属残留地体。它们共生于于古淮阳海中。从加里东运动开始,到燕山运动为止,随着古淮阳海的消失,先后拼合、增生在一起。     

工程高边坡稳定性评价的信息量法

通过对８种因素、７７种状态的信息量计算，得出研究区稳定性信息的权值。在取得１２８个预测单元的信息量预测值之后，划分出５３个活动单元和较活动单元，其中１２个为新预测的不稳定区。与仪器观测结果比较，一些新预测区的不稳定性得到证实。研究表明，信息量法对评价工程高边坡稳定性，特别是消除工程隐患具有重要意义。     

Socio-demographic area of Delhi

"This paper evaluates statistically and displays cartographically previously untabulated and unpublished data from the 1971 Census of India for the entire population of Delhi. Data pertain to Delhi's census 'charges' (wards) and were originally tabulated in the form of 348 variables relating to occupational distribution, migration, and non-worker status--each classified separately by gender. Although these data are subject to multiple reporting errors and fallacious ecological inferences, they constitute the largest database yet assembled for comparative analysis of Indian intra-metropolitan patterns and structures. Socio-demographic patterns and areas are identified reflecting the traditional-modern, formal-informal, familistic, and ethnic constituents of the national capital of India."