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101.
目前,大地电磁测深的资料处理与正、反演软件都是FORTRAN语言编写的,由于FORTRAN语言本身的局限性,使得这个软件存在很多的缺陷,但是因为用FORTRAN语言编写的算法已经比较成熟,将它全部用其他语言移植也比较费时费力,为了避免资料的浪费,提高大地电磁测深的资料处理与交互式系统的开发效率,并且更加完善其功能,在开发大地电磁测深二维交互式正反演系统时,对大地电磁测深中的计算部分仍用现有的FORTRAN程序,对有关的界面与图形诉开发部分用VC++语言来编写,以增强和体现其交互式的功能。 相似文献
102.
Luo Yan Liu Yongsheng Hu Shenghong Gao Shan Open Laboratory of Constitution Interaction Dynamics of the Crust Mantle System Ministry of National Lands Resources China University of Geosciences Wuhan Lin Shoulin Faculty of Material Sc 《中国地质大学学报(英文版)》2001,12(3)
INTRODUCTIONLaserablationinductivelycoupledplasmamassspectrome tryisanincreasinglydevelopedanalyticaltechniqueforsolidsampleanalysis.LA ICP MSoffersattractivecharacteristicsofhighsensitivity ,lowdetectionlimits,minimalsampleprepara tion ,lessoxidesinterfe… 相似文献
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黑龙江伊春红山华夏—安加拉混生植物群 总被引:1,自引:0,他引:1
系统研究了黑龙江省伊春红山地区晚二叠世红山组植物群,认为其性质为华夏—安加拉混生植物群。华夏植物区与安加拉植物区的界限,应以内蒙古陆及其东、西延展部分为界。 相似文献
107.
Modelling peak accelerations from earthquakes 总被引:1,自引:0,他引:1
This paper deals with the prediction of peak horizontal accelerations with emphasis on seismic risk and insurance concerns. Non‐linear mixed effects models are used to analyse well‐known earthquake data and the consequences of mis‐specifying assumptions on the error term are quantified. A robust fit of the usual model, using recently developed robust weighted maximum likelihood estimators, is presented. Outlying data are automatically identified and subsequently investigated. A more appropriate model accounting for the extreme value nature of the responses, is also developed and implemented. The implication on acceleration predictions is demonstrated. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
108.
青藏高原新生代火车头山碱性及钙碱性两套火山岩的地球化学特征及其物源讨论 总被引:3,自引:3,他引:3
藏北羌塘火车头山新生代火山岩可区分为钙碱性及碱性两个不同的系列。钙碱性火山岩主要岩石组合为玄武岩-安山岩-英安岩,其SiO_2介于49%~70%之间,Al_2O_3>10%,Na_2O/K_2O>1;其中玄武岩具平坦型稀土配分型式,LREE/HREE为1.3~1.8,(La/Yb)_N为2.87~4.45,无明显铕异常,δEu为0.96~1.09;该套岩石的Mg~#与SiO_2相关关系以及La/sm-La等亲岩浆元素与超亲岩浆元素协变关系表明,它们应为幔源岩浆经分离结晶演化的产物,其岩石组合类型以及低的Sm/Yb值(Sm/Yb=1.53~5.35)表明它们的原始岩浆应来源于岩石圈地幔尖晶石二辉橄榄岩的局部熔融。本区碱性火山岩为一套典型的钾质岩石系列,主要岩石组合类型为碱玄岩-碱玄质响岩-响岩,其SiO_2介于44%~59%之间,Al_2O_3>14%,Na_2O/K_2O介于0.47~1.51之间;岩石轻稀土强烈富集,LREE/HREE为13.20~15.76,(La/Yb)_N=50.44~91.99;其岩石组合类型以及Mg~#与SiO_2相关关系以及La/Sm-La协变关系同样表明它们为共源岩浆分离结晶演化的产物;然而,其较高的Sm/Yb值(Sm/ Yb=2.63~13.98)表明它们并非地幔橄榄岩直接局部熔融的产物,岩石弱的负Eu异常(δEu=0.77~0.85)以及Th、U的强烈富集和Nb、Ta的相对亏损,又反映了原始岩浆中有显著的地壳物质的贡献;该套钾质碱性系列岩石在La/Co-Th/Co同分母协变图上呈直线型分布,而在La/Co-Sc/Th异分母协变图上呈显著的双曲线分布,从而表明其源区为二源混合型,是青藏高原特殊的壳幔混合层局部熔融的产物,这些特征是新生代青藏高原壳幔层圈物质交换的重要岩石学证据。 相似文献
109.
Ilia Rodushkin Emma Engström Douglas C. Baxter 《Geostandards and Geoanalytical Research》2007,31(1):27-38
The analytical performance of a method for Os isotope ratio measurement by double‐focusing, sector field ICP‐MS (ICP‐SFMS) was evaluated. The method is based on several optimised, concurrent processes: Os extraction from samples in hot concentrated nitric acid; separation of Os from the digest solution by the formation of volatile osmium tetroxide accelerated by continuous hydrogen peroxide addition; transport of analyte vapour by an oxygen flow into the ICP; and isotopic determination by ICP‐SFMS. Due to the very efficient utilisation of analyte (approaching 0.5‰), Os isotope ratio measurement could be performed at low pg levels. Combined with an ability to process sample sizes up to 2 g (up to 50 g if the organic matrix of biological or botanical samples is eliminated by ashing), materials with Os concentrations in the low, or even sub pg g?1 range could be determined by this method. Given that two complete digestion/distillation systems were available for interchangeable use, throughputs of up to fifteen samples per 8 hour shift could be achieved. The method precision, evaluated as the long‐term reproducibility of 187 Os/188Os ratio measurements in a commercial Os reference sample containing 0.5 ng Os, was 0.16% relative standard deviation (RSD, 1s). The method has been applied to perform replicate 187 Os/188 Os ratio measurements on a suite of fifty reference materials of various origins and matrix compositions, with Os concentrations varying from < 0.1 pg g?1 to > 100 ng g?1, yielding an average precision of 3% RSD. Though none of the materials tested are certified for Os content or Os isotope composition, comparison of the obtained data with published Os isotope information for similar sample types revealed close agreement between the two. The method can also be used for the simultaneous, semi‐quantitative determination of Os concentrations. 相似文献
110.
We develop and analyze a mixed finite element method for the solution of an elliptic system modeling a porous medium with
large cavities, called vugs. It consists of a second-order elliptic (i.e., Darcy) equation on part of the domain coupled to
a Stokes equation on the rest of the domain, and a slip boundary condition (due to Beavers–Joseph–Saffman) on the interface
between them. The tangential velocity is not continuous on the interface. We consider a 2-D vuggy porous medium with many
small cavities throughout its extent, so the interface is not isolated. We use a certain conforming Stokes element on rectangles,
slightly modified near the interface to account for the tangential discontinuity. This gives a mixed finite element method
for the entire Darcy–Stokes system with a regular sparsity pattern that is easy to implement, independent of the vug geometry,
as long as it aligns with the grid. We prove optimal global first-order L
2 convergence of the velocity and pressure, as well as the velocity gradient in the Stokes domain. Numerical results verify
these rates of convergence and even suggest somewhat better convergence in certain situations. Finally, we present a lower
dimensional space that uses Raviart–Thomas elements in the Darcy domain and uses our new modified elements near the interface
in transition to the Stokes elements. 相似文献