查询词典 isotopic knot

In the past several decades, great achievements have been made by the marine foraminiferal boron isotope researches on the following aspects: analytical techniques, offsets between laboratories, isotopic fractionation factor, long-term changes in seawater boron isotopic compositions and vital effects.

最近，海洋浮游有孔虫硼同位素的研究在实验分析技术、实验室偏差、同位素分馏系数、海水硼同位素长期变化以及各种次要因素等方面都取得了长足的进步，尤其是全蒸发负热电离质谱法的建立使硼同位素分析的样品需求量降到纳克级以下。

Not only Sr-Nd isotopic but also Pb isotopic represent the characteristics of crustal granitoid.

无论Sr-Nd同位素还是Pb同位素特征都表现出壳源花岗岩的特点。

The vibrational spectra of two isotopic derivatives of γ-picolinic acid (-C^1^6O~2D,-C^1^8O~2H) have been predicted with the SQM force field resulting from the transferred scaling factors. The calculated isotopic shifts are in good agreement with experimental data.

用这组校正因子得到的力场预测了γ-吡啶甲酸的两个同位素衍生物(-C^1^8O~2H和-C^1^6O~2D)的振动光谱，所得同位素位移值与实验数据符合良好。

A systematic study on S and/or Pb isotopic compositions of the copper-bearing porphyries, ore minerals and andesite of the deposit shows that S isotopic compositions of ore minerals are similar to those of porphyries.

矿石矿物（208Pb/204Pb=37.917~38.230，平均值38.075；207Pb/204Pb=15.528~15.614，平均值15.571；206Pb/204Pb=17.929~18.082，平均值17.981）与矿化斑岩(208Pb/204Pb=37.832、37.883，207Pb/204Pb=15.529、15.538，206Pb/204Pb=17.906、17.910)以及安山岩(208Pb/204Pb=37.816~37.884，207Pb/204Pb=15.549~15.562，206Pb/204Pb=17.845~17.919)的初始铅组成基本一致，变化范围较小，表明三者具有相同的来源；在铅构造模式图上，所有样品铅同位素均位于造山带演化线上或附近，在铅同位素源区判别图中，均落入造山带和下地壳区域，这表明Pb主要来源于壳幔混合。

The iron isotopic composition lightly from hydrothermal fluid upwelled into ocean, BIFs are enriched in heavy isotopes of Fe by partial oxidation and precipitation, and iron isotopic composition was homogenous and reequilibrium during different minerals by metamorphism.

提出了地球早期海洋中Fe的循环模式：洋中脊喷发富集Fe轻同位素的二价铁热液流体，流体进入海洋后经过部分氧化和沉淀的过程使得BIF富集Fe的重同位素，后期的变质作用使得不同矿物间发生了Fe的均一化及再平衡

A method for determination of isotopic abundances of lithium based on the principle of isotopic dilution mass spectrometry was studied.

研究了基于同位素稀释质谱法原理准确测定锂同位素丰度的方法，编制方法的求解方程。

According to the research of Pb isotopic, the metallogenetic material mainly originated from the Permian basalts; the study of sulfur isotopic find that the sulfur of the basalt-type copper deposits and carbonaceous sedimentary interlayers-type copper deposits originated from both Permian basalts and evaporate of sedimentary section, S in bauxitic mudstone-type copper deposits originated from evaporate of sedimentary layers.

研究区三种类型铜矿的铅同位素示踪研究，成矿物质主要来自于邻近的二叠纪玄武岩；硫同位素研究结果显示，玄武岩型铜矿和含碳沉积岩夹层型铜矿中的硫有两种来源：二叠纪玄武岩和蒸发岩中的硫；而铝土质泥岩铜矿中的硫主要来源于沉积地层中蒸发岩的硫。

It is concluded that the ~(176)Hf/~(177)Hf ratios of 91500, Temora and We-1 were homogeneous, because the aforementioned Hf isotopic results consist of at least seven separated performances of aliquots for each zircon sample. These results have significant implications for zircon Hf isotopic determination by using LA-MC-ICPMS.

上述每个结果包括至少7组独立的锆石样晶的溶解、分离和测定，表明标准样91500、Temora和We-1是Hf同位素组成均一的，可作为LAM-MC-ICPMS(激光剥蚀多接受器电感耦合等离子体质谱)的原位微区锆石~(176)Hf／~(177)Hf比值分析过程中外部校正及监控标准样。

The authors discuss a special case here, namely the case of plannar isotopy. The main part of this paper gives two algorithms to determine whether two given knot/link diagrams are planar isotopic or not, and also compares them.

本文讨论了一种特殊情形下的得分类，即平面合痕下的等价分类问题，重点介绍了两种判断两个纽结图是否是平面合痕的算法，并对它们进行了比较。

Let K be an alternating knot or almost alternating knot , FS-K be an incompressible pair-wise incompressible surface.

设是中的交错纽结或是几乎交错纽结，是中不可压缩、分段不可压缩曲面。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。