同位素

13C of organic matter in pedogenic calcrete is widely used in the reconstruction of the past ecological environment.

土壤钙结岩中有机质的δ13C被广泛地应用于重建过去的生态环境；土壤碳酸盐包含的C、O稳定同位素组成能够指示土壤形成的气候，同时也是研究植被演替、古气候变化、水文条件变化的重要手段。

This paper is a design on experimental method which is used to detemine ratio of strontium isotopes in carbonate .

本论文的主要工作内容是碳酸盐岩Sr同位素的实验方法的设计。

A radioactive isotope of cesium used in radiation therapy.

铯的一种放射性同位素，用于放射疗法。

In addition, significant different copper isotope variation exists between primary native copper in North America and chalcopyrite and chalcocite. In general, the latter two copper minerals are major sources for smelted copper.

综合上述分析结果认为，铜同位素分析技术在区分北美本土自然铜以及在区分欧洲冶炼铜和北美自然铜等考古研究中具有较大的应用潜力和广阔的发展前景。

There are remarkable differences among chondrite groups in petrographic, mineralogical, chemical and O isotopic characteristics.

不同的球粒陨石群，其岩石学、矿物学、化学及氧同位素组成均有明显的差异。

This paper introduces the study methods and results of stable isotopes in carbonate rocks and chemical index of alteration in clastic rocks and advances a new scheme of Neoproterozoic division and correlation.

分别介绍了碳酸盐岩地层的稳定同位素和碎屑岩化学蚀变指数的研究方法和成果并依此提出新元古界划分和对比方案。

By measuring the ratios of different oxygen isotopes in ice cores, scientists can reconstruct climatic changes over time.

通过对冰核中不同氧的同位素比率测量，科学家可以重新模拟在过去的时间里气候所发生的变化。

We want to buy Copper Isotope Jh , Clink

我们要采购铜同位素

The ore-forming material sources of the Baiyangping copper-cobalt-silver polymetallic deposit have been studied by the characteristics of isotopic compositions of S, Pb, C, O, and H, and the Co/Ni ratio of cobaltite.

中文摘要：利用白秧坪矿床的S、Pb、C、O、H同位素组成特征和辉砷钴矿的Co/Ni比值特征，对成矿物质来源进行了分析。

Laser ablation inductively coupled plasma mass spectrometry was used to establish radiometric U-Th-Pb ages and produce the records of rare earth elements of conodont of the Permian Maokou Formation in the Three Gorges area.

利用激光剥蚀电感耦合等离子质谱对三峡地区二叠系茅口组牙形石的U-Th-Pb同位素年龄进行测定。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。