五酸溶样-电感耦合等离子体质谱法同时测定地质样品中的稀土等28种金属元素     

龚仓  丁洋  陆海川  卜道露  王立华  熊韬  张志翔 《岩矿测试》2021,(3):340-348

电感耦合等离子体质谱法(ICP-MS)测定大批量地质样品中的稀土和钴铪铟锰铌钽铊铬镉镓锗钒锡等金属元素,主要采用三酸或四酸溶解样品.由于地质样品组分复杂,稀土等金属元素含量低,各元素性质差异大,三酸或四酸溶样经常出现易挥发元素如钒铬镉镓锡的测定结果不稳定、镧铈镨钕等稀土元素溶解不完全的问题.本文在盐酸-硝酸-氢氟酸-高...  相似文献   

阿尔金山羌塘高原水资源开发及罗布泊钾盐矿建设的设想   总被引：1，自引：1，他引：0  

《阿尔金山及羌塘高原水资源开发利用与保护考察报告》编写组 《干旱区地理》2007,30(6):785-790

阿尔金山水资源相对丰富,是巴音郭楞蒙古自治州河川径流的主要形成区之一,巴音郭楞蒙古自治州若羌县罗布泊镇钾盐贮量很大,经济效益可观,但水资源成为了罗布泊钾盐矿发展的限制性因素。能否把阿尔金山的水资源作为罗布泊钾盐矿发展的支撑,是我们必须回答的一个问题。本文利用新疆维吾尔自治区水利厅阿尔金山野外考察资料,分析阿尔金山的水系与湖泊、自然地理和社会经济特点,以期为探讨阿尔金山能否作为罗布泊钾盐矿开发的水源条件提供理论依据。  相似文献   

DRY-SEASON VARIABILITY IN SUSPENDED SEDIMENT CONCENTRATIONS IN THE SOUTH PASSAGE OF THE CHANGJIANG ESTUARY     

Wenxiang ZHANG Shilun YANG Jun ZHU Shiliang GONG Pingxing DING 《国际泥沙研究》2007,22(3):199-207

This paper reports the results of continuous monitoring of turbidity, water depth, salinity (using an Optical Backscatter Sensor (OBS)), and current velocity (using a Current meter (SLC9-2)) in the South Passage of the Changjiang Estuary over a spring–neap period in February 2003 (dry season). The turbidity measured via OBS was closely correlated with the suspended sediment concentration (SSC), which was highly variable. Over the study period, the SSC in the middle layer ranged from 110 to 1400 mg/l. The minimum SSC occurred during a late ebb tide, and the maximum SSC occurred during a late flood tide. On average, the SSC was 1.5 times higher during flood tide than during ebb tide. Vertically within the water column, SSC increased downward, with the ratio of SSC measured near the bed to that measured at the surface ranging from 1.90 to 18.3. The temporal variability in SSC is jointly governed by tides and wind-induced waves, whereas the vertical variability in SSC is attributed to the effect of gravity and vertical water circulation.  相似文献   

Can Eddy Forcing be Responsible for the Spatial Structure of the Northern Hemisphere Annular Mode?     

ZHAO Nan  LI Yan  SHEN Xinyong 《Acta Meteorologica Sinica》2010,24(5):584-592

In order to study the origin of the spatial structure of the Northern Hemisphere Annular Mode (NAM),a linear stochastic model is constructed empirically from the output of a GCM run.Optimal stochastic forcing in terms of the maximum variance contribution,which may be potentially related to the maintenance of the NAM,is investigated.Theoretical analysis on the dominant non-modal response to the stochastic forcing shows that this dominance is jointly decided by the properties of forcing and the non-modal grow...  相似文献   

Study on Flow Field Around Vertical Breakwater Under Different Overtopping Conditions Based on Numerical Simulation     

蒋学炼  吴米玲  李炎保 《中国海洋工程》2010,(4)

A numerical wave flume is constructed based on the Reynolds Averaged Navier-Stokes (RANS) equations with turbulence closure by a modified k-ε model to study the viscous interactions of waves with vertical breakwaters for different overtopping cases. The governing equations,the turbulence model,boundary conditions,and solution method for the numerical wave flume are introduced briefly. The reliability of the numerical wave flume is examined by comparing the numerical results with the experimental measurement...  相似文献   

Correlation Between Total Lightning Activity and Precipitation Particle Characteristics Observed from 34 Thunderstorms     

ZHENG Dong  MENG Qing  ZHANG Yijun  DAI Jianhu  ZHONG Min 《Acta Meteorologica Sinica》2010,24(6):776-788

A total of 34 thunderstorms around Shanghai and Wuhan of China are analyzed in order to determine the relationship between total lightning activity and precipitation particle characteristics.Precipitation particle concentration data are obtained from the 2A12 product of TRMM/TMI(Tropical Rainfall Measuring Mission/TRMM Microwave Image) and lightning activity data are from the TRMM/LIS(Lightning Imaging Sensor) and SAFIR3000(Surveillance et Alerte Founder par Interferometric Radioelectirque).On a spatial ...  相似文献   

中国冰冻圈水文过程变化研究新进展   总被引：10，自引：2，他引：10       下载免费PDF全文

丁永建  张世强  吴锦奎  赵求东  李向应  秦甲 《水科学进展》1990,31(5):690-702

冰冻圈显著的变化已经对冰冻圈水文过程产生了一系列影响。本文重点梳理和分析了近20年，尤其是近10年以冰川融水、融雪径流、冻土水文等为主体的中国冰冻圈水文过程变化研究方面取得的新进展：①在冰川融水变化研究方面，对不同尺度的冰川融水开展了全面研究，发现冰川融水呈现全面增加之势；对冰川融水"拐点"是否出现进行了科学辨识，有了基本认识；对冰川融水过程进行了模型模拟，取得显著进展。②在融雪径流变化研究方面，通过对不同流域融雪径流估算，可基本掌握各河流的融雪贡献率；中国融雪径流变化差异较大，增减不一；融雪期变化具有普遍性，突出特点是峰值提前。③在冻土水文研究方面，通过对地表水-活动层壤中流-多年冻土层上水之间关系的研究，揭示了冻土区径流形成的重力和热力耦合机制；多年冻土变化对地表径流的影响已经显现，主要表现在冬季（枯水季）径流增加；已经发现多年冻土退化对径流有直接补给作用，在一些流域补给量可能达到一定量级。  相似文献   

胶东西北部地区金矿床铅同位素特征及其地质意义   总被引：5，自引：0，他引：5  

王义文 《吉林大学学报(地球科学版)》1988,(3)

胶东地区不同类型金银、铅锌矿床及交代—深熔花岗岩三者的铅同位素特征相似,皆为来自铀针亏损型源区的多阶段铅。在Pb~(207)/Pb~(204)-Pb~(206)/Pb~(204)图解上,它们的投影点可拟合成一条直线。据此,并根据大量的K-Ar、U-Pb、Rb-Sr和Ar~(30)-Ar~(40)年龄数据,得t_1=3.2Ga,t_2=0.15Ga,μ_1=7.07～8.17,W_1=29.16～35.80,Th/U=3.97～4.52。矿石铅与胶东群变质岩岩石铅同位素统计对比表明,金银、铅锌和交代—深熔花岗岩中的铅皆来自再活化的下地壳源铅。  相似文献   

红砂岩修筑浆砌石坝的岩土工程研究   总被引：9，自引：0，他引：9  

张剑锋  岳国生  黄春耈 《上海国土资源》1989,(2)

红砂岩为中低强度岩层、岩相复杂多变,较易风化、软化。本文通过工程实践阐述了在红砂岩分布地区利用当地材料建造浆砌块石坝的岩土工程研究,开创了红砂岩筑坝的先例。  相似文献   

上海地区深部构造特征和地震活动趋势探讨     

黄兆熊  高德章 《上海国土资源》1989,(4)

本文介绍由重磁资料计算上海地区居里面、莫霍面、均衡重力异常及地幔流应力场的方法和成果,并在对成果初步分析的基础上,探讨了深部地质构造特征及其与地震活动趋势的关系,其中着重讨论了居里面及其与地震活动的关系。文章最后提出了对上海地区地震活动趋势的几点认识。  相似文献