西藏高原大地电磁深探测———亚东—巴木错沿线地区壳幔电性结构

摘 要　 展示了超宽频带大地电磁深探测所获得的西藏亚东—巴木错沿线地区电性结构图像; 阐述了西藏中、南部特殊的壳幔电性特征。     

断裂带热释光的初步研究

本文对湖南水口山矿田断裂带岩石进行了热释光分析,断裂作用可对岩石的热释光特征产生显著变化。断裂带岩石天然热释光不存在250℃以下的低温峰;从围岩到断裂带中心,热释光峰值大幅度增加;同一断裂带从地表向深部热释光峰值增加。碎裂断裂带天然热释光峰值为10~3—10~4级,高峰温度位于290—310℃范围内;硅化断裂带的天然热释光峰值大多为10~2—10~3级,高峰温度多在330—350℃范围内。     

气态膜回收氰化物的研究

气态膜是一种新型的膜分离技术,适用于从水溶液中分离提取挥发性物质。本文对气态膜回收氰化物的迁移机理及各种影响因素进行了研究,结果表明：传质速率与料液浓度呈现线性递增关系;吸收液浓度、流速和料液浓度、流速在一定范围内影响传质速率;温度升高,传质加快;膜孔径及孔隙率增大,传质速率也随之增大。     

青藏高原唐古拉山北坡夏季风降水特征的初步分析

利用ＧＡＭＥ－Ｔｉｂｅｔ加强观测期间（１９９８年５￣９月）Ｄ１０５站的降水资料,初步分析了青藏高原唐古拉山北坡夏季风降水的特征。表明从６月７日到９月１８日,这１０４ｄ中有８１ｄ产生降水,总结水量为２７９．２ｍｍ,每天平均降水量达３．４５ｍｍ。可以认为６月７日左右为唐古拉山北坡Ｄ１０５站处夏季风爆发日。８月份降水量最大。为１２１．６ｍｍ,占观测期间总降水量的４３．６％。在夏季风期间,季风降水存在着明     

粉煤灰土壤及所产蔬菜的有害元素含量变化和环境意义

利用南京第二热电厂湿排的粉煤灰,进行了改良蔬菜土壤的试验,并对试验用的粉煤灰、不同施灰量的土壤及所产蔬菜共３８ 个样品的有害元素和放射性元素含量进行了系统的测定。结果表明：这些元素在土壤中的含量与粉煤灰施用量无明显相关性;在本次试验范围内施用粉煤灰没有造成土壤的污染;其所产蔬菜的这些元素含量也均低于国家卫生标准限值,食用是安全的。     

Geogene Versus Anthropogene Origin of Trace Metals in Sediments in Cua Luc Estuary and Ha Long Bay, Vietnam

In the present study, the geochemistry of 49 surficial-bed and 101 core sediment samples is investigated to clarify the origin of trace metals in the Cua Luc Estuary and Ha Long Bay, which is a famous World Natural Heritage Site in Vietnam. Moreover, the potential mobility of trace metals is also assessed and their relationship with reference elements (Al, Fe, and Ca) and organic matter is established in order to make recommendations for sediment management and monitor future pollution. Generally, trace metals display higher concentrations in Ha Long Bay compared to the Cua Luc Estuary. However, this is controlled by the distribution of the fine (clay?+?silt) fraction, and hence the concentrations of Al, Fe, Ca, and organic matter (OM). The comparison of concentrations of trace metals (normalized towards Al) between the surficial sediments and the subsurface core sediments based on ¹³⁷Cs datings indicates that almost all surficial-sediment data fall inside or deviate slightly from the 95 % prediction interval of a background regression line. In addition, as determined by a Community Bureau of Reference three-step extraction, trace metals mainly dominate in the residual fraction (assumed to relate to crystal lattice of primary and secondary minerals), and this fraction does not change much in recent sediment layers. Therefore, trace metals are supposed to be derived from natural bio/geochemical processes and are characterized by a low potential mobility. Consequently, the established linear regression relationships of trace metal vs. Al or multiple regression relationships of trace metal vs. multi-elements (Al, Fe, Ca, and OM) are useful for the prediction of background levels of trace metals in sediments in future pollution monitoring and assessment programs.     

Geochemistry of Brines from Salt Ore Deposits in Western Tarim Basin

In the geological evolution of the Tarim Basin, many transgressions and relictions happened. So there have been plentiful sources of salt. Moreover, because of uttermost drought, a lot of salt has been deposited. It is possible to find potash salt in this area. In our fieldwork, we have found salt and brine in western Tarim Basin. Based on a geological survey and the characteristics of sedimentary facies and paleogeography, this paper deals with the geochemical parameters and discusses the possibility of formation of potash salt in terms of the chemical analyses of samples collected from western Tarim Basin. Results of brine analysis lead to some conclusions: most of these salt brines have eluviated from very thick halite beds, mainly chloridetype salt and this kind of halite does not reach the stage of potash deposition in all aspects; WKSL (Wukeshalu) occupies a noticeable place, and we should attach importance to this district because there have been some indicators of the occurrence of potash deposits as viewed from the contents of Br and K. Finally, low Br contents are recognized in the Tarim Basin as a result of salt aggradation, and this point of view has been proved by the results of this experiment and the data available. It cannot depend upon the index of Br to judge the evolution stage of halite. We must look for other facies of potash except marine facies.     

起伏地表地震波场角度域照明分析

角度域照明可以更加细致地对地下复杂地质体进行照明分析。提出了一种适用于起伏地表条件下的角度域照明分析方法,其主要过程是利用局部倾斜叠加技术分解波场,对起伏地表处采用加权函数判定局部时窗内的振幅包络位置,以区分其位于地表之上或之下;并引入相似系数函数计算反假频局部平面波场,根据局部斜率与平面波场入射角关系,得到局部角度域地震波场;根据帕斯瓦尔等式下的时间-角度域照明关系式,计算得出角度域照明强度。通过起伏地表高速侵入矿体模型试算,得到给定观测系统下角度域照明强度与地下分析点照明随炮点、波场入射角的变化关系。此方法可用于起伏地表条件的观测系统优化、叠前AVA分析等方面。     

加强工程施工项目管理措施与建议

结合项目施工管理的经验,从建立项目管理班子、项目评估和合同评审签订、人力资源的优化配置、强化劳务管理、责任成本管理、建立激励约束机制六个方面来探讨加强工程项目管理办法,并同时提出了加强工程项目管理的具体措施与建议.