同位素

40Ar-39Ar method is the first one of the possible geochronology techniques to solve this difficult scientific problem.

油气成藏作用伴生的矿物种类少，主要为碳酸盐矿物，以及少量石英和黄铁矿等，这些矿物均不适合用传统同位素年代学方法进行年龄测定，因此，油气成藏年龄是同位素年代学尚未解决的一大科学难题。40Ar-39Ar法是可能应用于油气成藏年龄测定的首选同位素定年方法。

Isobaric impurities must be removed before measurement because they will interfere the accuracy of results.

浓缩同位素除了单同位素丰度高的特点，还必须具有高化学纯的特点，以提高同位素基准配制的准确度。

To study the changing law of stable carbon isotope composition in cattle tail hair with the change of feeds composition, and to verify each section of cattle tail hair can't exchange with other sections once it is produced, and it contains isotopic information which can reflectthe cattle feeds information from the time when it is produced.

研究牛尾毛中稳定性碳同位素组成随饲料改变的变化规律，确证牛尾毛一旦长成，其中的稳定性碳同位素不再与其它部分的进行交换，每段毛发记录的同位素信息可反映毛发生长时的饲料信息。

To study the changing law of stable carbon isotope composition in cattle tail hair with the change of feeds composition, and to verify each section of cattle tail hair can't exchange with other sections once it is produced, and it contains isotopic information which can reflect the cattle feeds information from the time when it is produced.

研究牛尾毛中稳定性碳同位素组成随饲料改变的变化规律，确证牛尾毛一旦长成，其中的稳定性碳同位素不再与其它部分的进行交换，每段毛发记录的同位素信息可反映毛发生长时的饲料信息。

This dissertation got the deposit forming of Qulong copper porphyry copper deposit by SHRIMP zircon U-Pb and Re-Os molybdenite methods.

对驱龙铜钼矿床进行了锆石SHRIMP U-Pb同位素定年及辉钼矿Re-Os同位素定年，获得新的年龄数据：含矿斑岩锆石SHRIMP U-Pb年龄为16.35～17.58Ma，矿石的辉钼矿Re-Os同位素年龄为15.36～16.85Ma。

The detection limit was 10 times better than the conventional SPME method. Under the optimized analytical conditions, aqueous samples of trichloroethylene/perchloroethylene (20 μg/L) and benzene/toluene (10 μg/L) were analyzed. The δ13C fractionation compared to pure-phase and headspace analysis was less than 0.5‰.

在优化的条件下，对20 μg/L的三氯乙烯/四氯乙烯和10 μg/L的苯/甲苯水溶液进行了单体碳同位素分析，相比于纯溶剂碳同位素值，顶空同位素分析误差不超过0.5‰，而样本标准偏差为0.3‰。

Some global consistent and comparable marine Sr isotope curves for the Phanerozoic have been established recently.

近年来，显生宙以来海水锶同位素的变化曲线不断得以补充和修正，已建立起具有全球一致性、可对比的海水锶同位素变化曲线背景值，为锶同位素的应用奠定了基础。

In some cases, stratigraphic relations require these excursions to be sustained for millions of years at values even below the mantle average of -5‰, the minimum value for a steady state C isotope mass balance in the Phanerozoic ocean.

某种程度上来说，层序的相关性需要至少低于地幔平均值-5‰并且至少多个百万年的同位素数值来获得，稳定碳同位素最小值对于新生代海洋碳同位素平衡起到了平衡的作用。

The result of factor analysis can provide the changes of relative precipitation and temperature variations. In trace elements, Cu, As, Zn, Pb and Ni were apparently enrichmented in soil layers and are sensitive to climatic changes. Carbon isotope is more sensitive to climatic changes than that of oxygen isotope in loess stratigraphy. The heavy mineral are varified in the loess stratigraphy, but their content differences between loess and palaeosol is little. Though the palynologic analyses results reveal that pollens and spores are fewer in the loess stratigraphy, they differ greatly in loess layer and palaeosol layer not only in species but also in types, i. e., the pollens and spores indicating warm and moist climate, such as Lles, Podocarpus, Polopydium, Pteris grerilliana Wall, Pterocarya and Juglans appear in palaeosol layers, while those indicating cold and dry climate such as Ephedra, Artemisia, Chinopodiaceae, Picea and Abies exist mainly in loess layers. The pollen content of broad-leaved tree mainly consisting of Pterocarya is up to 60% in palaeosol 〓, while the content of Ephedra is more than 50% in 〓 loess layer, showing that the environment differed greatly when 〓 and 〓 were formed.

当然，常量元素氧化物的组合因子分析结果可提供相对降水与相对温度在剖面的变化，因而来反映气候状况更为理想；微量元素中Cu、As、Zn、Pb与Ni在成土过程中富集明显，亦较好地反映了气候变化；稳定同位素中的碳同位素比氧同位素更能敏感记录气候的变化；研究区黄土地层中重矿物种类较多，但黄土层与古土壤层中含量差异不大；孢粉分析结果揭示，尽管研究区黄土层中孢粉总量相对较为贫乏，但黄土层与古土壤层中孢粉种属相差较大：在古土壤层内出现了指示相对暖湿环境的冬青属、罗汉松属、水龙骨属、林下凤尾蕨、枫杨、胡桃等植物孢粉，而黄土层中麻黄、藜科、蒿属及冷杉、云杉含量较高。

When O and radiogenic isotopic measurements are employed as tracers to evaluate magma-country rock interaction it is essential to provide evidence that open system processes have not perturbed the isotopic systematics.

用氧同位素和放射性同位素示踪岩浆和围岩相互作用时，必须在开放体系没有扰动同位素系统情况下进行。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。