ON SOME KEY SEDIMENTATION PROBLEMS OF THREE GORGES PROJECT (TGP)

I. INTRODUCTIONThe Three Gorges Project (TGP) being planned is to be located on the Yangtze River at Sandouplug, 44 km upstream of Yichang (Fig. l). A scheme studied in the feasibility stage has the crest ofthe dam placed at 185 m with a maximums height o…     

航空摄影最佳曝光量的选择

分解力是评定影象质量的重要指标。本文介绍利用改进后的国产9 w测微密度仪,测定航空软片静态分解力与曝光量的关系。以最大分解力所相应的曝光量作为确定航摄软片感光度的基准,以此为基础,确定航摄底片的最大密度(D_(max))、最小密度(D_(min))、影象反差(△D)和平均密度(D_R)本文对国产1022T、1022P、柯达2402、2412等航摄软片进行了研究,其试验结果可作为今后修改航摄规范的基础。     

天津市城市热岛效应的综合性研究

近几年,我们采用较先进的仪器设备,进行了天津市城市热岛效应的综合性探测和红外线航空遥感测量。并对地面和低空城市热岛强度、厚度和结构进行了分析。结果表明,白天低空热岛强度比地面热岛强度强。并有冷湖现象;在城市内,热岛是由一些小热岛群组成;我们还用能量平衡模式对城市热岛的结构进行了研究。     

暴雨系统中环境涡度场与散度场之间相互关系

观测事实和理论研究表明,暴雨系统的形成和发展与环境涡度和散度的分布和演变有十分密切的关系。因此用涡度方程和散度方程来诊断和分析流场结构比其它方程(如动量方程)更为直接,物理意义也更加清楚,这就吸引气象学者把它用于分析实践。如Matsumoto等用完全涡度方程和散度方程各项来诊断中尺度系统发展过程中对流活动的作用;Schaefer选取散度方程中与发展有关的项来诊断未来风暴的发生,发现其相关率可达90％以上。我国学者也研究过散度方程各项的大小以及某些重要项对暴雨形成的作用。鉴于涡度方程和散度方程在气象中常采用其近似关系式,故本文对方程各项进行     

Development of the ultrasonic measurement technique and its application in the observation of rock mass stability

Summary A method of measuring ultrasonic wave properties in rocks during the complete stress-strain process is described. The relevant experimental laboratory study, to reveal the change of the amplitude spectrum parameters with strain (or stress) has been carried out. A preliminary study was conducted on the application of the ultrasonic measurement technique at a belt conveyor roadway of the north wing in Baodian coal mine, Shandong province. A borehole ultrasonic device with dry coupling was developed to provide better coupling and more accurate measurement data in comparison with those of a water coupled situation. Based on the interrelations between the complete stress-strain properties of specimens and their wave properties, the structural properties of surrounding rocks, the range of yield zones, and the change of stresses within the rocks surrounding a roadway which was subjected to mining influence of upper longwall face were analysed. Amplitude spectrum parameters were used to give a better prediction of the physico-mechanical state of the surrounding rocks.     

Distribution of Rare—earth Elements in the Shenzhen Bay and Dapeng Bay Modern Sediments

The aim of this paper is to study the REE geochemistry of the Shenzhen Bay (SZB) and Dapeng Bay(DPB) modern sediments, discuss their REE distribution patterns, reveal the REE geochemical difference between the two bays which share the same material source but are deposited in different sedimentary environments, and expound their dynamic changes.It can be concluded that the SZB and DPB sediments are essentially of continental source.Their REE distribution patterns are quite different from those of Pacific pelagic sediments, but are very similar to those of South Chi-na granites.Because of different sedimentary environments prevailing in the SZB and DPB, some REE fractionation would have taken place in the sediments of the two bays.     

云南鹤庆—丽江地区锰资源量预测：资源量模型法的应用

云南鹤庆—丽江地区是我国著名的优质富锰矿产区,已探明储量超过300×10~4t。然而该区的锰资源量前景如何?本文试图运用资源量模型法,将鹤庆矿区作为已知模型区,通过模型区与预测区的特征分析,求出类比系数。最后通过随机抽样模拟,得出各种概率下预测区锰资源量估计值。     

M17树脂对岩石中痕量硒碲的分离富集研究及应用

M_(17)树脂在>6mol/L的HCl介质中能同时吸附Se和Te,Se和Te可用水和丙酮分别洗脱,也可用丙酮同时洗脱。从而建立了两个新的Se、Te分离富集体系,使原子荧光测定达到纳克量级。