变频激电法在四川某金矿中的应用     

扶永铭  王益民 《物探化探计算技术》1996,(S5)

本文介绍了用变频激电法寻找含金硫化物矿体 ,通过对视幅频效应 Fs,和交流视电阻率 ρsf的分析 ,取得了良好的地质效果  相似文献   

X射线荧光测井的井液效应及其校正     

伍岳  林玉飞 《铀矿地质》1996,12(1):41-47

本文从Ｘ射线的性质，以及Ｘ射线与物质作用的机理出发，对井液效应进行了研究，并对其影响过程进行模拟。在理想井液模型上，推导出Ｘ射线活度与钻孔参数的数理关系。在此基础上，进一步研究得到了能适应野外多变情况的井液效应校正公式（ＣＢＷＥ）和方法。  相似文献   

Screening Effect of the Diffusive Boundary Layer in Sediments of Lake Aha in the Suburbs of Guiyang City,Guizhou Province   总被引：6，自引：0，他引：6  

万国江  万曦等 《中国地球化学学报》1997,16(4):347-352

The redox cycle of iron and manganese is a major geochemica process at the boundary layers of lake sediments.Lake Aha,which lies in the suburbs of Guiyang City,Guizhou Province,China,is a medium-sized artificial reservoir with seasonally anoxic hypolimnion,Long-term sedimentary accumulation of iron and manganese resulted in their enrichment in the upper sediments,In the anoxic season,Fe^2 and Mn^2 ,formed by diological oxidation,would diffuse up to overlying waters from sediments.However,the concentration of oxidation,would diffuse up to overlying waters from sediments,However,the concentration of Fe^2 increased later and decreased earlier than that of Mn^2 .Generally,sulfate reduction occurred at 6 cm below the sediment-water interface.Whereas,in the anoxic season.the reduction reached upper sediments,inhibiting the release of Fe^2 ,The Fe concentration of anoxic water is quickly decreased from high to low as a result of reduction of the suplhur system.  相似文献   

试论温室效应对我国西部河川径流的影响   总被引：2，自引：1，他引：2  

赖祖铭 《冰川冻土》1997,19(1):10-16

大气中日益增多的温室气体使我国西部地区的气候近三四十年来出现了干暖化趋势，导致河川径流量明显减少。据统计，从５０年代后半期到８０年代，新疆地区的河种径流量减少了６．４％，西藏东南部的３条大河从６０年代到８０年代则平均减少了１３．２％，其减少量大于新疆，这主要是因为气温升高使冰雪融水增加，新疆的河流受到冰雪融水的补偿，虽然西藏东南部的河注也有冰川存在，甚至冰种覆盖面积远大于新疆一些内陆河流域，但那里  相似文献   

Electric Field Effects on Animals:Mechanism of Seismic Anomalous Animal Behaviors (SAABs)     

Huang Qinghua  Ikeya Motoji  and Huang PeihuaDepartment of Earth  Space Sciences  Graduate School of Science  Osaka University  Osaka  Japan Department of Earth  Space Sciences  University of Science  Technology of China  Hefei  China 《中国地震研究》1997,(1)

Electric field effect on animals has been studied to investigate its relation with seismic anomalous animal behaviors(SAABs)in China.Freshwater eel,crucian carp,catfish,and soft-shelled turtle responded to the threshold electric field of 1-10 V/m,while duck,goose,cat,sheep,pig,dog,and chicken all responded to the ground electric field of about tens of V/m,depending on the species as well as on individuals.Most of the behaviors caused by electric field were similar to those reported as SAABs such as alignment,sudden movement,panic,and convulsion.The intensity of electric field due to a major earthquake would have been over these threshold values.Numerical estimation based on an electromagnetic model of a fault has been made to induce SAABs as electric shocks to pulsed electric fields in electro-physiology.The seismic electric signals(SES)intensity might be estimated from the observation of SAABs.  相似文献   

The temporal and spatial characteristics of the surface air temperature variations over the Antarctic and its surrounding area   总被引：1，自引：0，他引：1  

Longhua Lu  Lingen Bian  Pengqun Jia 《中国科学D辑(英文版)》1997,40(4):432-438

The characteristics of the spatial distribution, temporal variations trend and oscillation for the surface air temperature variations during 1957—1993 in the Antarctic and its surrounding area were analyzed. The results show that the short-time climate change in the Antarctic is complex both temporally and spatially. The Antarctic is by no means the strongest responding region to the global greenhouse effect. There is a distinguished difference in the trends of the temperature changes for the Antarctic and global mean, which could not be explained simply by the global greenhouse effect. Project supported by the National Antarctic Key Project of China (85-905).  相似文献   

青藏公路沿线通信光缆埋设地段冻土工程地质条件及评价   总被引：1，自引：5，他引：1  

王家澄  吴紫汪 《冰川冻土》1997,19(3):240-244

青藏公路沿线季节冻土和多年冻土的总长度为７６０ｋｍ，根据气温冻结指数和融化指数可估算最大季节冻结深度和最大季节融化深度。根据含水量划分出５种冻土类型和５个冻胀敏感性等级。提出了光缆埋设若干选线和施工建议。  相似文献   

季节性冻结滞水促滑效应——滑坡发育的一种新因素   总被引：12，自引：4，他引：12  

吴玮江 《冰川冻土》1997,19(4):359-365

在综合分析西北季节性冻土地区滑坡发生时间规律和危险斜坡变形动态规律的基础上，提出季节性冻融作用产生的冻结滞水效应可使斜坡区地下水富集，土体软化范围扩大瞌 水压力增大，是本区滑坡发育的一种重要外动力因素，并对其作用机理和发生条件进行了论述。  相似文献   

三组结构面状态下不同产状结构面的力学效应研究     

周瑞光  张向东 《工程地质学报》1997,5(4):318-322

本文分析了三组结构面产状模型力学实验结果, 揭示了这种组合条件岩体中产生压剪区、张剪区及结构面、结构体的多种变形成分, 也揭示了压剪区和张剪区形成机理、及三组结构面组合下结构面产状的力学效应。  相似文献   

成都粘土裂隙成因研究   总被引：1，自引：0，他引：1  

赵翔 《地质灾害与环境保护》1997,8(4):40-46

根据成都粘土中裂隙特征与地质环境条件的分析，提出成都粘土中途中眩要裂隙类型的成因模式，上升剥蚀引起的垂向卸荷作用产生波状水平裂隙，冲沟切割引起的侧向卸荷作用，产生平行斜列隙裂。  相似文献