Geochemical and Environmental Evaluation of Um Shashoba Gold Mine Area,Southeastern Desert,Egypt     

Mohamed Abdallah Gad DARWISH 《《地质学报》英文版》2011,85(4):881-898

A suite of elements(Ag,Au,Ba,Bi,Cd,Co,Cr,Cu,Ga,Hf,Hg,Mn,Mo,Ni,Pb,Rb,Sb,Se, Sr,Te and Zn),total organic carbon(TOC)and pH were analyzed in stream sediment and tailing samples from Um Shashoba area,in order to evaluate Au placer and the sediments being impacted by old mining activities.Analytical results were examined using statistical,graphical and mapping methods.In spite of the results revealing that Au and most of the elements in sediments were in general significantly lower than those in tailing,Au wa...  相似文献   

干旱区机械化集雨整地造林效果分析——“瓦勒拉尼系统”集雨造林效果研究     

王君厚  董建林  李忠平  赵中南  赵有贤  赵国君  王树元  王永民  林景友  庞秀谦 《中国沙漠》2011,31(5):1260-1266

 从2006年到2009年,中国国家林业局与意大利环境国土海洋部合作,应用意大利机械化集雨抗旱整地造林技术——“瓦勒拉尼系统” 在内蒙古赤峰市进行造林试验示范。与传统的人工整地造林相比,降水利用率提高两倍,土壤紧实度降低82%,土壤含水率平均提高60%,造林成活率提高30%左右。对“瓦勒拉尼系统”整地造林各项技术参数的测试分析表明,该系统具有深耕集雨、快速高效、经济实用、适应性强等特点。该系统在集雨抗旱造林方面具有的优越性和先进性,为该系统在中国干旱区推广应用提供了科学依据和实用技术方法。  相似文献   

不断提高重大气象灾害应急处置水平 为江西经济社会又好又快发展保驾护航     

《气象与减灾研究》编辑部 《气象与减灾研究》2008,31(3):5-10

2008年7月8日,江西省政协人口资源环境委员会、省政府应急管理办公室、省减灾委员会、省公共管理学会在南昌联合举办了2008年重大气象灾害应急工作研讨会。来自省、市、县人民政府及省直有关部门、科研院校、企事业单位以及新闻媒体的领导、专家学者、应急管理人员60多人参加了研讨会。会议围绕由2008年年初特大雨雪冰冻灾害引发的灾害链、危机管理、信息传播、应急联动、输电路设计、建筑结构,以及农林业减灾、气象决策服务等诸多方面,认真总结了这次特大雨雪冰冻灾害应急工作的经验和教训,同时分析了当前江西省自然灾害应急管理工作的现状和存在的问题,并就进一步加强和完善自然灾害应急工作提出了许多真知灼见,许多有价值的新观点、新主张和建设性意见,对江西改进重大气象灾害和自然灾害应急工作有很重要的启发意义。现将部分新观点、新主张和建设性意见摘要刊出,以飨读者。  相似文献   

On the Genesis of the Super-large Baguamiao Gold Deposit in Fengxian County, Shaanxi Province   总被引：2，自引：0，他引：2  

Zhong Jianhua  Zhang Guowei Exploration Department  Petroleum University of Chin  Dongying  Shandong Department of Geology  Northwest University  Xi''an  Shaanxi 《《地质学报》英文版》1997,71(2):189-203

The Baguamiao gold deposit in Fengxian County, Shaanxi Province, is a recentlyexplored super-large gold ore deposit. A comprehensive and deep-going study has revealedthat it is a polygenetic deposit: early-stage mineralization due to shearing, middle-stagemineralization due to hydrothermal alteration, and late-stage mineralization due toweathering, leaching and concentration at shallow depths. Shearing played a dominant role inthe formation of gold orebodies.  相似文献   

Probabilistic Analysis for Seismic Stability of Beach Earth Embankment     

He Guangne Yang Bin Professor  Dalian University of Technology  Dalian Engineer  Design  Research Institute of Shanghai Harbour Engineering  Shanghai 《中国海洋工程》1995,(4)

The current safety factor method for evaluating earth embankment stability is not very rational since the assessment of slope stability is really an uncertainty problem. In order to consider the random property of this problem, the probabilistic analysis is introduced herein. Finally, the stability of a real beach earth embankment is analysed by means of the suggested probabilitic approach. It may be seen that the results of analysis can represent the numerical assessment of the degree of seismic stability.  相似文献   

Analysis of Dynamic ECG in the 80 Meters Saturation -100 Meters Excursion Heliox Dive     

Gao Bingchun  Gong Zhiping  Huang Xiaoqin Head of the Medical Department  The No. Hospital of PLA  Shanghai Vice Head of the Medical Department  The No. Hospital of PLA  Shanghai Resident Physician  The No. Hospital of PLA  Shanghai 《中国海洋工程》1991,(3)

The study deals with the observation of the changes in the electrical activities of 8 healthy divers in the 80 msw saturation-100 msw excursion heliox dive by DCG. Results showed significant changes in the 24 h of average heart rate, the decrease of heart rate at saturation storage depth and decompression periods being 15.5% and 19.7% respectively. Fortuitous supraventricular premature beats appeared in 8 divers and ventricular premature beats in 5 divers during exposure. Transient ischemic ST-T changes in 6 divers occurred repeatedly during diving operations. The discussion puts up the view that the ST-T changes were due to the stress reaction of the body induced by the combined effect of such stress factors as hyperbaric pressure per se, high partial pressure of oxgen, noise and the closed restricted chamber environment.  相似文献   

Model Study of Permeable Caisson Breakwater with Slanting Slabs     

Wang Jianyi Ge Zhijin Senior Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1993,(2)

- This paper describes the design of a permeable caisson breakwater with slanting slabs (Types I and 11) and presents some preliminary experimental results, together with relevant figures and tables. Analysis is made of the reflection coefficient, transmission coefficient, acting wave pressures, water jetting at the crest of the breakwater, and wave overtopping. Experiments show conclusively that this type of breakwater has the advantages of light dead weight, good wave-absorbing performance, low coefficients of reflection and transmission, and small wave overtopping.  相似文献   

Dynamic Analysis for Structures Isolated with Dampers     

Gu Peiying  Gao Ming M. Sc  Engineer  Material  Structure Department  Nanjing Hydraulic Research Institute  Nanjing Professor  Material  Structure Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1996,(3)

- In this paper, mathematical models and dynamic analyses for both SDOF and MDOF structures isolated with dampers are established and performed, and a comprehensive computation method is provided. The shock absorbing effect is illustrated through an example of a two DOF damper-isolated system excited by sinusoidal waves and actual ground acceleration input recorded in earthquakes. It is shown that most of the responses of the structure with dampers reduce greatly near the resonant zone, but acceleration is enlarged in the lower or higher frequency zone; among various parameters, the influence of frictional coefficient n is the most significant, that of damping ratio of the dampers , is the second, and that of stiffness coefficient of the dampers k, is the slightest.  相似文献   

Wave Breaker Indices in Finite Water Depth   总被引：2，自引：0，他引：2  

Li Yucheng  Dong Guohai Teng Bin Professor  Civil Engineering Department  Dalian University of Technology  Dalian Ph. D. Student  Dalian University of Technology  Dalian Research Assistant  Doctor of Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1991,(1)

Based on the analysis and comparison of wave breaker indices defined by geometric, kinetic as well as dynamic stabilities and verified by observation, the value a, which is equal to H / Lthkd by Miche's result and may be modified by Goda's results, is" suggested as the wave breaking criteria. The applicable values of a for pure waves or wave-current co-existing field are given in this paper. They are smaller than Miche's result (0.142), and they have been verified by model tests.  相似文献   

阿尔泰乔夏哈拉铁铜金矿床的地质特征及其特殊性   总被引：3，自引：0，他引：3  

应立娟  王登红  梁婷  周汝洪 《地质学报》2006,80(10):1572-1578

乔夏哈拉铁铜金矿床位于北准噶尔构造带北缘,与阿尔泰造山带内分布的近同一时代的蒙库和阿巴宫铁矿不同。其赋矿围岩为苦橄质火山岩,区别于与火山岩相关的各类铁(铜)矿。铜矿石异常富集稀土,平均含量可达736.26×10-6,在铁铜矿中也罕见,较为特殊。  相似文献