查询词典 carbon 14

The coke formation on butadiene catalyst was studied in a flow system by means of carbon-14-labelled compounds.

在流动系统中，用碳-14标记化合物研究了丁二烯催化剂上的结焦过程。

Nowadays scientists can answer many questions about the past through a technique called radiocarbon, or carbon-14, dating.

现在科学家们能通过一种被称为放射性碳，即C-14的一种技术来测定年代，回答许多关于过去的事情

These pioneers have included the scientists or teams that discovered many of the fundamental particles of matter, analyzed the cosmic microwaves left over from the earliest epoch of the universe, developed carbon-14 dating of ancient artifacts, decoded the genetics of viruses, and created an entirely new state of matter called a Bose-Einstein condensate.

这些先驱者包括科学家或小组，发现了许多基本的物质粒子，分析了宇宙微波遗留下来的时代最早的宇宙，开发碳14测年的古代文物，破译基因的病毒，并建立了一个全新的物质状态称为玻色爱因斯坦冷凝物。

Within a fairly short time after their discovery, historical, paleographic, and linguistic evidence, as well as carbon-14 dating, established that the scrolls and the Qumran ruin dated from the third century B.C.E.

在他们的发现之后相当短的时间里，历史的，古文书学的，语言学，和碳-14测定证据确立了古卷和库姆兰会社遗址开始于公元前第三世纪直到公元前68。

With use carbon 14 measurements to the stone statue according to the spot cist, the Easter island is a 5th centry A.D. to build of, and be unlike to say of so ancient old.

跟据现场考古对石像用碳14的测定，复活节岛是公元5世纪造的，并不像詹说的那么古老。

Do you know how long half-life of carbon 14?

你知道碳14的半衰期有多久吗？

For the cases of CHD,the level of plasma endothelin-1 in these of HPIgG seropositivity is higher than that of HP seronegativity(P.05).(4) No correlation between chronic HP infection and essential hypertension,diabetes mellitus,tobacco use,age,gender,vocation,living condition ,alcohol consumption and family history was found.(5) For the cases of positive for Carbon-14 urea breath test in CHD patients, the level of plasma GLU is higher than that of negativity for Carbon-14 urea breath test (P.05).The rate of positive for Carbon-14 urea breath test in CHD patients with diabetes mellitus is significantly higher than that of CHD patients without diabetes mellitus.

结果(1)冠心病组血清HPIgG阳性率明显高于非冠心病组(45.54％vs 28.30％，P＜0.05)；(2)冠心病组C-14呼气试验阳性率明显高于非冠心病组(54.46％vs 30.19％，P＜0.01)；(3)冠心病组慢性HP感染者血浆ET-1水平明显高于非HP感染者(P＜0.05)；(4)慢性HP感染与血脂、高血压史、糖尿病史、吸烟史、年龄、性别、职业、生活环境、饮酒史以及冠心病家族史无关；(5)现症HP感染与糖尿病及空腹血糖升高有关(P＜0.05)；与血脂、高血压史、吸烟史、年龄、性别、职业、生活环境、饮酒史以及冠心病家族史无关。

By analyzing the ratio of carbon-14 to nitrogen-14, researchers can determine, within a narrow margin, when the sample in question last breathed or photosynthesized .

通过分析碳14和氮14的比例，研究人员能够以极小的误差确定被研究的标本最后进行呼吸的时间或最后进行光合作用的时间。

"Carbon dating:The determination of the approximate age of an ancient object, such as an archaeological specimen , by measuring the amount of carbon 14 it contains."

碳定年：通过测量古代文物，如考古标本中碳-14的含量，从而测定该古物的大致年代。

Unlike the constituents of living organisms, fossil fuels contain little or none of the radioactive form of carbon: the carbon 14 isotope, which has eight neutrons in the nucleus rather than the usual six.

和生物体组成不同的是，化石燃料的放射性同位素碳14（原子核内有8个中子，一般碳原子只有6个）含量非常低，有些甚至没有。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。