丰度比

ISOCS在铀同位素丰度比测量中的应用

Application of ISOCS to measurement of isotopic abundance ratio of uranium

生产堆元件铀同位素丰度比和含量的测定

Determining of isotopic abundance ratio and content for reactor pins

用中子活化分析法测定~（238）U/~（235）U同位素丰度比

Determination of ~ ( 238 ) u / ~ ( 235 ) u isotopic ratio by neutron activation analysis

为了测定土壤中痕量铀的同位素丰度比，对TOPO萃取色层分离环境样品中U的方法进行了探讨。

An efficient separation procedure for uranium from soils by TOPO chromatographic extraction has been developed .

TOPO萃取色层分离-ICP-MS法测定土壤中痕量铀的同位素丰度比

Determination of Uranium Isotopes Ratios in Soil by ICP-MS and TOPO Extraction Chromatography

皮克量级钚同位素丰度比的TIMS分析

Analysis on the Isotopic Ratio of Picogram Pu by TIMS

本文简介了使用FinniganMAT262热电离质谱仪对超微量钐天然同位素丰度比的精密测定。

The measurement method of the isotopic abundance ratios for the nanogram samarium was performed by Finnigan MAT 262-RPQ thermal ionization mass sepctrometer .

用于微量锂同位素丰度比测定的坩埚&热电离方法

A Crucible-Thermionic Method for Precise Isotopic Ratios Determination of Li

使用胶体石墨技术测定铀同位素丰度比

Uranium Isotope Ratio Measurements Using a Colloidal Graphite Technique

光泵磁共振法测量同位素铷的丰度比

Measurement of Isotopic Element Rb 's Abundance Ratio with Optical Pumping Magnetic Resonance Method

天然钐和浓缩钐同位素丰度比质谱测定

The Determination of The Abundance Ratio of Natural Samarium and Enriched Samarium By Mass Spectrometry

三氯化硼中硼同位素天然丰度比的红外光谱测定

Determination of natural fractional isotope abundance ratio of boron in boron trichloride by infrared spectroscopy

使用铀同位素标准物质校正质谱计，方法测量铀同位素丰度比的准确度和精密度明显提高。

After calibrated by Uranium isotope ratio reference materials , the accuracy and precision are improved .

热表面电离质谱精确测定人体排泄物中锌同位素丰度比

Accurate Determination of Isotopic Ratios of Zn in Human Body Excreta by Thermal Ionization Isotope Mass Spectrometry

最后得出在铀同位素丰度比为01～10的范围内，95%的置信水平下，该方法的相对扩展不确定度为010%

Under 0.1 ~ 10 isotope ratio range and 95 % confidence , the relative expanded uncertainty of the technique is 0.10 % .

240Pu/239Pu的同位素丰度比分别为0.15和0.18。

Plutonium isotopic ratio , 240Pu to 239Pu , was also obtained for 0.18 at Xi ′ an and 0.15 at Gansu , respectively .

由此可获得同位素效应的光谱线位移量、同位素的丰度比及其光谱线的洛仑兹宽度与多普勒宽度。

By this method the magnitude of isotope shift , isotope abundance ratio , Lorentz width and Doppler width of the spectral profile can be deduced .

~2H-Tyr/~2H-Phe丰度比时相曲线下的面积。实验结果表明：代偿性肝硬化病人的苯丙氨酸羟化酶活力低于正常人，失代偿肝硬化病人的该酶活力又低于代偿性肝硬病人。

The results revealed that the activity of phenylalanine hydroxylase was impaired in cirrhotic patients and the impairment was more severe in decompensated than in compensated cirrhosis .

在同样的仪器条件下测定了硼同位素浓缩过程中样品三氟化硼甲醚络合物中的硼同位素丰度比，测定结果的相对标准偏差为1.095%。

Boron isotope abundance of ( CH3 ) 2O · BF3 complex was measured under the same instrument conditions when 10B isotope was concentrated , with the relative standard deviation of 1.095 % .

这样，即使在2个基本标准的丰度比的比值达到5的条件下，2种方法的标定结果的相对偏差远小于0.01%。

Therefore , even the ratio of the abundance ratio of the two essential standards reaches 5 , the relative derivation of results determined by the two methods as mentioned above is much less than 0.01 % .

区域化探成果显示胶东金矿直接矿源岩郭家岭花岗岩金的丰度比原始矿源岩早前寒武纪变质沉积岩系及侵入岩系金的丰度低1/2。

As proved by regional geochemical achievements , abundance of direct ore source rocks Guojialing granite is 1 / 2 lower than its in original ore source rock metamorphic sedimentary rocks and intrusive rocks in early Precambrian .

着重探讨3月30日至4月1日的大气污染过程，测定表明铅含量高，206Pb/207Pb丰度比低，铅锌相关性强，有色冶金工业来源造成铅污染可能性大。

A lead pollution episode was observed during the period of March 30 to April 1 , 2002 . It may be attributable to non-ferrous metallurgical industry with typical low ratio of 206Pb / 207Pb and strong association between lead and zinc .

采用稀酸浸出法处理天津市1994~2001年冬春季节123个玻璃纤维滤膜大气颗粒物样品，测量了大气铅浓度和同位素丰度比（206Pb/207Pb）。

The diluted acid leaching technique was adopted to treat 123 air particulate matter samples collected on glass fiber filter in Tianjin City in winter and spring of 1994 ~ 2001 , and the air lead concentration and isotope abundance ratio ( 206Pb / 207Pb ) were determined .

转录后基因表达调控在线粒体转录本后期的修饰中起着关键的作用，主要体现在蛋白质的丰度变化比mRNA的丰度高。

Post-transcriptional regulation of gene expression play a key role in mitochondrial transcript modification , and it is mainly reflected in change of the protein abundance is higher than mRNA .

胶园土中有机质和N、P、K、Ca、Mg以及Cu、Zn、Mo、Cr等元素的丰度值比自然土低。

The abundance values of organic matter and N , P , K , Ca , Mg as well as Cu , Zn , Mo , Cr in the soil of rubber plantations are lower than those in natural soil .

特别值得一提的是，研究人员研究了氪和氙两种气体元素的同位素比值。同位素比值是指一种特定元素中各种同位素之间的丰度之比。

In particular , the researchers were studying the isotope ratios or the comparative abundances of the different forms of a particular element of the gaseous elements krypton and xenon .

该法测量锂同位素丰度之比的相对标准偏差优于0.1%，最好时可达0.047%。

Using the procedure , the related standard deviation of lithium isotope ratio is better than 0 . 1 % , and the best is up to 0 . 047 % .

然而，Ir/Os和Ir/Au等元素丰度比值与太阳丰度比不符，有可能是二亿三千万年以来这些元素在风化过程中不同的地球化学行为所致。

However , the ratios of Ir / Os and Ir / Au do not agree with the solar value , which may be caused by a long-term weathering process .

与星族Ⅰ恒星相反，贫金属的星族Ⅱ的F和早型G型矮星大气锂丰度弥散很小，且其丰度比年轻的星族Ⅰ恒星和星际介质锂的丰度约低一个量级。

In . contrast with Pup I stars the Li abundances of Pup ⅱ F - and early G-type dwarfs show a very small dispersion and they are about an order of magnitude smaller than the value of the young Pup I stars .

指数表示法计算的资源丰度值实现了资源丰度在可比尺度上的综合评价。

The enrichment value of resources calculated by the method of index expression could synthetically evaluate the enrichment of resources on the comparative dimension .