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痕量
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  trace
    THE SIMULTANEOUS DETERMINATION OF 15 TRACE RARE EARTH ELEMENTS IN ROCKS BY PLASMA ATOMCOMP DIRECT READING SPECTROMETER SYSTEM
    等离子体直读光谱法同时测定岩石中15个痕量稀土元素
短句来源
    X-Ray Fluorescence Spectrometric Determination of Trace Amounts of REE in Ores by Ion Exchange paper
    离子交换纸富集、X—荧光光谱测定岩石中痕量稀土元素及钪
短句来源
    Spectroscophic Determination of Trace Gold in Rocks and Soils with Polyurethane Foam
    岩石土壤中痕量金泡塑富集光谱测定
短句来源
    CHROMATOGRAPHIC COLUMN EXTRACTION SEPARATION- PHOTOMETRIC DETERMINATION OF TRACE SCANDIUM IN ROCKS AND ORES
    萃取柱色谱富集分离-光度法测定岩石矿石中的痕量
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    DISCUSSION OF SOME PROBLEMS IN TRACE ANALYSIS
    痕量分析中若干问题的探讨
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  “痕量”译为未确定词的双语例句
    Determination of Micro Amounts of Ga in Rocks by Chromatographic Separation with P_(350)
    P_(350)萃取色谱分离和岩石中痕量镓的测定
短句来源
    Some Problems on Analysis and Cirtification of Traco Element in Geological Reference Materials
    地质标准物质中痕量元素的分析定值应重视的几个问题
短句来源
    A LIQUID-LIQUID EXTRACTION METHOD WITH TRI-N-OCTYLAMINE FOR SEPARATION OF THORIUM ISOTOPES IN GRANITE
    花岗岩中痕量钍同位素的液-液萃取分离法
短句来源
    Titration of Gold in Minerals,Rocks and Natural Waters by Using the New Indicator Vanadate-Auric Reagent Ⅱ
    钒金试剂Ⅱ指示滴定法测定天然水和岩矿中痕量
短句来源
    Determination of Multielement in Zircon by ICP-AES
    感耦等离子体发射光谱法测定锆英石中主次痕量元素
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  trace
Using related sequences of Lucas numbers, other 3-manifolds are constructed, their geometric structures determined, and a curious relationship between the homology and the invariant trace-field examined.
      
Trace Inequalities, Maximal Inequalities, and Weighted Fourier Transform Estimates
      
We show that the trace of an indefinitely oscillating function on a subspace of ?d is not always indefinitely oscillating.
      
In the periodic case, the number of oscillations of the trace depends on the regularity of the function.
      
As applications, we obtain characterizations of the Besov and Triebel-Lizorkin spaces on Lipschitz curves, and the trace theorem on Γ of the Besov spaces onR2.
      
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Trace vanadium and nickel in crude oil and the ratio of V/Ni are used for identificaticn of crude oil of continental and marine origin. Based on data from 17 oil fields in China, it has been concluded that generally speaking oil with V/Ni<1 is of continental origin and that with V/Ni>1 is of marine origin. The form of occurrence of vanadium and nickel in crude oil and their possible sources are discussed with reference to data available from home and foreign sources.

本文介绍了原油中痕量金属钒、镍与V/Ni比值划分我国陆相原油与海相原油。根据我国十七个油田测量数据可以导出:一般V/Ni<1为陆相原油;V/Ni>1为海相原油。文章还根据国内外资料探讨了痕量金属钒、镍在原油中存在形式和可能的来源。

The study of the elemental abundances of various order of tectonic units is one of the fundamental tasks of tectono-geochemistry. In this paper, the writer contributes the calculated model and values for the abundance of chemical elements in oceanic and continental crusts (Tablel). Based on the view of th etrace elemental geochemistry, and related to the evolution of the crust, the distributed characteristics and REE patterns of these elemental abundances are discussed respectively.

研究各级大地构造单元的元素丰度,是构造地球化学的一项基本任务,本文提供了大洋地壳和大陆地壳元素丰度的计算模型和计算值(表1),并以痕量元素地球化学的观点,结合地壳的演化,分别讨论了这些元素丰度的分布特征和稀土模式。

Abstract

为解决天然样品中元素的赋存状态及样品粒度对粉末法光谱分析的影响,本文根据苏联文献中的不完整资料,解决了设计上、材料选择上和工作条件选择上等一系列技术问题,重新设计制造了“电弧蒸发回收”装置。该装置采用电弧蒸发和静电集尘回收原理,使各种复杂的天然物质转变为简单的氧化物,回收物的粒径可达0.1μm以下。该装置不仅适用于中高含量范围,也适用于痕量元素样品的预处理。经该装置预处理的样品与撒样法和ICP粉末法相结合均取得了较好的分析效果。

 
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