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1.Eight equations computed isotopic abundance and two equations computed isotopic abundance ratio have been given.
给出八个计算丰度公式和两个计算同位素比公式。收藏指正
2.The isotopic abundance ratio and content are determined with isotopic mass-spectrometry.
文章用同位素质谱法测定了辐照堆元件铀的同位素丰度比和含量。收藏指正
3.Isotopic Abundance Determinations of Hafnium in a Hafnium Reagent and a Control Rod
铪试剂及控制棒中铪同位素丰度测定收藏指正
4.Accurate Measurement for the Concentration and Isotopic Abundance of Rhenium Using Multi-Collector Inductively Coupled Plasma Mass Spectrometer
多接收器等离子体质谱精确测定铼含量及其同位素丰度收藏指正
5.The measurement method of the isotopic abundance ratios for the nanogram samarium was performed by Finnigan MAT 262-RPQ thermal ionization mass sepctrometer.
本文简介了使用Finnigan　MAT　262热电离质谱仪对超微量钐天然同位素丰度比的精密测定。收藏指正
6.After leaching with diluted nitric acid,21 aerosol samples collected on glassfiber filter in Tianjin from November 1998 to February 1999 were analyzed for ?ρ?(Pb),?w?(Pb) and isotopic abundance ratio of ????206?Pb/????207?Pb.
对天津市1998年11月—1999年2月期间21个玻璃纤维滤膜大气颗粒物样品,采用稀酸浸出法溶解后,测量了ρ(Pb),w(Pb)和同位素丰度比206Pb 207Pb。收藏指正
7.The 48 h air mass back trajectory map provided plenty of detailed meteorological information and ,combined with ?ρ?(TSP),?ρ?(Pb) and ?w?(Pb) as well as lead isotopic abundance ratio,can be used to characterize lead pollution in air. ?
48h反向风迹图提供了大量详实的气象信息,结合ρ(TSP),ρ(Pb),w(Pb)和同位素丰度比的数据,可用于综合表征铅污染的状况。收藏指正
8.The result shows that the determination datun is in the range of error, the result obtained from RPQ-IC is 0.14% higher than that from Faraday cup, the inner precision and outer precision from the determination of isotopic ratios of low abundance uranium by RPQ-IC collector system are higher than from Faraday cup.
实验表明 :所得结果在误差范围内 ,RPQ-IC测量结果比 RPQ-FAR测量结果偏高 0 .1 4% ; RPQ-IC测量低丰度铀同位素的内精度比法拉第杯测量结果高 ,外精度比 FAR杯测量结果也高 ;收藏指正
9.Biomarker parameters of transgressive member have specific characteristics:Pr/Ph less than 1,higher abundance of steranes,abundance of C 27 are similar to C 29 stertane,tricyclic terpane with feature of C 21 <C 23 >C 24 and isotopic composition of n alkanes enriched 12 C.
在生物标志化合物参数方面表现为Pr／Ph小于1，甾烷含量丰富，甾烷中C27化合物丰度与C29相当，三环萜烷有C21＜C23＞C24的分布特点，单体烃同位素表现出富集轻碳同位素的特点。收藏指正
10.To the great scale of the universe age, 187 Re- 187 Os isotopic pair, which have very long half life, was used as a cosmic nuclear clock of cosmochronometr. It is a typical relationship between modern astronomy and nuclear physics. The neutral isotope abundance ratio of 187 Re over daughter nucleus 187 Os in common growth mineral can be used as the clock to measure the time.
以很长半衰期 ( 4 2× 1 0 9a)的 β-衰变的 187Re- 187Os核对作为大尺度的宇宙核钟来量度宇宙的年纪 ,是近代天文学与核物理学相结合的又一典范 .收藏指正
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