isotopes

isotopes

1. The telltale signature is a deficit of lighter isotopes, which are more easily lost.

洩漏迹象的，是较轻同位素的不足，这是因为较轻的同位素比较容易散逸。

2. New Paleo-tracers and Tracer Calibrations: Nitrogen Isotopes, Silicon Isotopes, ...

17新的古示踪剂和示踪剂校正；氮同位素、矽同位素...

3. In December 1978, the Pioneer Venus 1 probe and orbiter measured argon isotopes in the atmosphere of Venus.

1978年12月，金星先驱者1号探测器和轨道飞行器，测定了金星大气层中的氩同位素。

4. Carbon and Nitrogen stable isotopes

C和N同位素

5. LIU Guang-yao.Method to Determine the Hydrogeological Parameters of Aquifer Using Radisactive Isotopes [J].Site Investigation Science and Technology,1997,(2) :3-8.

[9]刘光尧.用放射性同位素测定含水层水文地质参数的方法(下)[J].勘察科学技术,1997,(2):3-8.

6. A research team used a newfangled method for measuring rare isotopes to accurately date glaciers in New Zealand.

一个研究小组使用一种新奇的方法来测量稀有同位素的含量，从而准确地的推测出位于新西兰的冰川年代。

7. Which of the following isotopes has the longest half-life?

下列哪种同位素的半衰期最长？

8. Chemical reactions would not do the trick, because all isotopes are chemically identical.

不可能是化学反应，因为所有同位素的化学性质都一样。

9. They are characterized by different characters of component, carbon isotopes, light hydrocarbons and the different distribution regions and series of strata.

不同类型的天然气，其组分、碳同位素和轻烃特征各异，并且分布区域和层系也表现出差异性。

10. Textbook reactions cannot explain the emergence of unusual isotopes of metals such as molybdenum and ruthenium seen in the sun and meteorites.

不过，课本中所列出的反应，却无法解释某些不寻常金属同位素的出现，例如太阳与流星中所含的钼和钌。

11. The slope and the constant item in the meteoric water line (MWL), compared to the global MWL, are both smaller in Kunming, and are related to the evaporation enrichment of heavy isotopes as raindrops fall in unsaturated atmosphere.

与全球大气水线相比,昆明站大气水线的斜率和常数项均较小。 这与雨滴在未饱和大气中降落时重同位素的蒸发富集作用有关。

12. Dongying North part deep sand Shasi low Subsegmental of gas condensate methane and ethane are lighter isotopes shows that Cracking gas oil characteristics, rather than kerogen pyrolysis gas.

东营北带深层沙四下凝析油气甲乙烷同位素均较轻，表现出明显的原油裂解气特征，而非干酪根裂解气。

13. It is useful to introduce a shorthand notation to facilitate the identification of various isotopes.

为了便于区别各种不同的同位素,引进简化的符号是很有用的。

14. Many elements in nature are found to be mixtures of different isotopes.

人们发现,自然界的许多元素都是不同的同位素的混合物.

15. Analyzing archaeological remains of bone and hair for their abundances of the stable isotopes of carbon and nitrogen (carbon 13 and nitrogen 15) can provide information about a person's diet.

从考古遗址出土的遗骸，分析骨头、毛发中碳13、氮15等稳定同位素的丰度，可以得到有关饮食的资讯。

16. A detailed search for the isotopes of all the elements required a more precise technique.

仔细寻找所有元素的同位素需要更精密的技术。

17. A detailed search for the isotopes of all the elements required a more preci se technique.

仔细研究所有元素的同位素需要更精密的技术。

18. They consider isotopes of great value for the study of high energy physics.

他们认为同位素对研究高能物理学有很大价值。

19. But even if nature could miraculously create a similar process on a microscopic scale, the mix of xenon isotopes in the aluminum phosphate grains we studied would have been different from what we found.

但是，即使大自然能奇迹似的在微小尺度创造出类似的过程，磷酸铝颗粒中的氙同位素组成也会和我们所发现的不同。

20. The most common isotope of oxygen, for example, has an atomic weight of 16, but there are also rarer isotopes with weights of 17 and 18, caused by additional neutrons in their nuclei.

例如很常见的同位素氧，原子重量是16，但是还有更为稀少的重量为17和18的同位素，这是因为它们的原子核中有额外的中子。

21. If so, the grains would contain a wide variety of isotopes from elements heavier than lithium.

假如如此，尘烬里就会包含诸多种类的比锂重的元素的同位素。

22. photo-separating uranium isotopes

光分离铀同位素

23. Keywords Dioxins;Fishes;HRGC/HRMS;Isotopes;FMS;

关键词二恶辛类;鱼类;HRGC/HRMS;同位素;自动纯化系统;

24. Title： Study on the Sr, Nd, Pb and O isotopes of basic dyke swarms in the Wudang block and basic volcanics of the Yaolinghe Group.

关键词：基性岩墙群；基性火山；同位素；地球化学；武当地块；耀岭河群

25. Of all kinds of stable isotopes, 15N stable isotope technique plays a very important role in the research on nitrogen cycling in natural ecosystems and is still functioning efficiently now.

其中，稳定性同位素15N自然丰度法近年来在生态系统氮素循环研究中发挥了和正在发挥着极为重要的作用。

26. Atoms of the same element that differ in their atomic weight are called isotopes.

具有不同原子量的同一种元素被称为同位素。

27. In this paper, method of quantity calculation of mixed|source natural gas is established based on composition and carbon isotopes of methane and ethane.

利用天然气中甲烷和乙烷的组成及碳同位素值,建立了不同来源天然气混合的定量计算方法。

28. The Canadian nuclear reactor at Chalk river, Ontario, is the largest single supplier of isotopes in the world.

加拿大核反应堆位于安大略省乔克河畔，是世界上最大的同位素供应源。

29. The hall-life measurement of long-lived radio isotopes, cross section measurement of nuclear reaction, searching for super heavy elements, cosmic study and solar neutrino detection are the main components which have been discussed.

包括放射性核素半衰期的测定、核反应截面的测量、超重元素的寻找、宇宙射线和太阳中微子性质等方面的研究工作。

30. SEPARATION OF URANIUM ISOTOPES BY CHEMICAL EXCHANGE

化学法分离铀同位素

31. Isotopes with long half-lives have many uses in medicine and industry, but they must be handled and disposed of with great care, in case they cause radiation damage.

半衰期长的同位素在医学和工业方面有许多用途，但必须极其慎重而严格地控制和处理，以免招致辐射的伤害。

32. Sulphur can influence the carbon isotopes of gaseous hydrocarbon.

单质硫还会影响气态烃碳同位素组成。

33. The aberration caused by magnetic sublevel structure and isotopes are small enough to be neglected.

原子的磁支能级、同位素等因素对像差影响很小,可以忽略不计。

34. The cracking gas from oil is very different from the cracking gas from kerogen in components and carbon isotopes.

原油二次裂解生成的天然气与干酪根初次裂解生成的天然气在组分特征和碳同位素特征上存在明显的差异。

35. Isotopes that emit radioactive particles; a stove emitting heat.

发射出放射性粒子的同位素; 发出热量的炉子

36. Isotopes that emit radioactive particles; a stove emitting heat

发射出放射性粒子的同位素；发出热量的炉子

37. It is seen that the points representing stable isotopes define a rather narrow stability region.

可以看到，表示稳定同位素的那些点，构成一个很窄的稳定性区域。

38. The compositions of stable isotopes in each deposit have some differences, which are related to the geological enviroment during the mineralization.

各矿床矿石稳定同位素组成也有一定的差别，这与成矿时的地质环境有关。

39. Isotopes could also be used in pet food or as a means to protect workers or soldiers from radiation.

同位素也可以用于宠物食品或者作为保护工人或者士兵免受放射。

40. emission spectral analysis of isotopes

同位素发射光谱分析

41. The compositions of carbon and oxygen isotopes fall in values between that of magma carbonate and marble.

同位素地球化学研究表明成矿物质具多源性，这与该类金矿所处的构造边缘（转换）环境有关。

42. Isotopes are different varieties of the same element, which have identical chemical properties but differ in atomic weight.

同位素是同一元素的不同种类，它们有着相同的化学特性但是原子重量不同。

43. This article presents how to shower isotopes, the exact process of isotope tracer flow survey, and its interpretation methods.

同时还总结出几点经验,如测井速度的选择、同位素的释放、负流量的形成原因等。

44. TSR is also a reason for the partial reversal trend of carbon isotopes in some regions.

同时，在局部地区硫酸盐热还原（TSR）也可引起碳同位素组成的局部倒转。

45. Later he named these separate forms isotopes.

后来他称这些不同的形式为同位素。

46. The auriferous cherts have the geological characteristics of sedimentation;the REE, Si and O isotopes of the cherts are unanimous with hot-water sedimentary cherts.

含金硅质岩具有沉积作用形成的地质特征，其稀土元素、氧、硅同位素地球化学特征与热水沉积作用形成的硅质岩一致；

47. The uranium geoanalysis methods currently used for elements,nuclides,isotopes, speciation,micro zone,fluid inclusion and organic compounds are reviewed.

回顾了目前铀矿地质分析测试所使用的元素分析技术、核素和同位素分析技术、元素形态分析技术、微区分析技术、流体包体与有机成分分析技术。

48. Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.

因为较重的同位素倾向于留下，当水从海洋表面蒸发时，余下的海洋水逐渐变得富含氧18。

49. The interval is two mass units because these isotopes of the elements differ by two neutrons.

因为这些元素的同位素相差两个中子，所以其间隔为两个质量单位。

50. According to the contents and C, O isotopes of carbonate rocks, the rules of paleoclimate evolution can be inferred and the paleoenvironment can be reconstructed.

因此，可以根据湖泊碳酸盐矿物的含量和碳、氧同位素变化等信息推知其形成时期的气候环境，重建古环境，揭示气候环境演变的规律。

51. Ordinarily, this mixture means little because the various isotopes are almost indistinguishable in most of their properties.

在一般情况下，这种混合是无所谓的，因为各种同位素在它们的主要属性上几乎是无法区别的。

52. After my colleagues and I had worked out in a general way how the observed set of xenon isotopes was created inside the aluminum phosphate grains, we attempted to model the process mathematically.

在想通了观察到的氙同位素大致如何在磷酸铝颗粒中生成之后，我和同事就试图用数学模式来模拟这个过程。

53. In certain fusion processes, among nuclei of the hydrogen isotopes, neutrons of high energy are liberated.

在氢同位素原子核中的某些熔合过程中，会释放出高能中子。

54. Ions of different isotopes converge at different points on the photographic plate .

在照相底板上不同的同位素的离子会聚于不同点。

55. There are two main types of uses of radioactive isotopes in biochemistry.

在生物化学中，放射性同位素主要有两方面的应用。

56. Inside that canister is a sphere containing the fuel: two isotopes of hydrogen called deuterium and tritium.

在那个小盒子里，有一个球盛放燃料：被成为氘和氚的氢的两种同位素。

57. The general comment on isotopes should be carefully read before interpreting iso-tope values.

在阐述同位素值之前需要仔细阅读关同位素的概述。

58. Evolution of helium isotopes in the Earth's mantle

地幔中的氦气及其释放情况

59. Studies on geochemistry, stable isotopes and REE geochemistry showed that the deposit was a polygenic composite deposit.

地球化学、稳定同位素和稀土地球化学等方面的研究表明，高家堡子金银多金属矿床是多成因复合矿床。

60. Depending on the nature of this event, the proportions of the different isotopes of any given elements are somewhat different.

基于这种特性，特定元素的同位素比例会有些许不同。

61. oxygen and carbon stable isotopes

壳体同位素

62. And by measuring the carbon isotopes in French fries, University of Hawaii researchers found that one oil tops all others as the choice to fry fries in: corn oil.

夏威夷大学的科学家测量了炸薯条中的碳同位素，发现有一种油的出镜率遥遥领先：玉米油。

63. Most isotopes produced artificially are radioactive.

多数人工制造的同位素都具有放射性。

64. Compositions of S and Sr isotopes for celestine are similar to those for general sea waters.

天青石中硫、锶同位素值和海水硫、锶同位素值相近。

65. She had carried test tubes containing radioactive isotopes in her pocket and stored them in her desk drawer, remarking on the pretty blue-green light that the substances gave off in the dark.

她总是把装有放射性同位素的试管放在口袋里随身携带，或将它们存放在办公桌的抽屉内，这些元素在夜晚总是会发出美丽的蓝绿色光芒。

66. Unstable nuclei attempt to achieve stability by emitting some form of radiation, until they transform themselves into stable isotopes.

如果原子核是重核，也就是说原子核如含有大量质子和中子，就可能更加趋于不稳定。

67. Rather they were the products of the decay of radioactive isotopes of iodine, which in turn were formed from radioactive tellurium and so forth, according to a well-known sequence of nuclear reactions that gives rise to stable xenon.

它们其实是碘同位素放射衰变的产物，而碘是由放射性碲产生，依此类推，经由人们所熟知的一系列核反应而产生稳定的氙。

68. It will use magnetic fields to confine hydrogen isotopes and heat them to hundreds of millions of degrees Celcius.

它利用磁场约束氢的同位素并将其加热到数亿摄氏度。

69. Canada led the world in the development of radioactive isotopes for medical diagnosis and therapy, says Jacalyn Duffin, a medical historian at Queen's University in Ontario.

安大略省奎恩大学的医学史学家JacalynDuffin说，加拿大在医学诊断和治疗领域应用放射性同位素的进程是世界领先的。

70. The results demon-strate that the decontamination effect for main reaction products, specially radioactive Ba isotopes, is satisfactory. The chemical yield of Ra is more than 70%.

实验结果表明,该流程对主要反应产物,特别是Ba的去污较好,Ra的产额可达70%以上。

71. Experimental results indicate that the adsorption capacity of hydrogen isotopes on 601 is higher than that on AC or CNF at liquid nitrogen temperature and CNF has the smallest adsorption capacity.

实验结果表明:601对氢同位素的吸附量为最高、AC次之、CNF最小,并存在明显的同位素效应;

72. The decisive evidence for isotopes came from two quite different experiments in 1913.

对同位素的决定性证明来自1913年两个相当不同的实验。

73. Osmium isotopes in the natural isotopic mixture are separation by gas centrifuge technology.

对天然锇同位素进行了离心分离。

74. The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon,has allowed geologists to more precisely determine the age of rock formations.

对放射性同位素衰变的测量，尤其是铀、锶、铷、氩和碳，可允许地质学家更精确地确定岩层的年龄。

75. Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

射气几种氡的同位素的放射性气体，是放射性物质衰变的产物

76. Gamma rays have proved very helpful in medicine and industry. These rays are also given off by radioactive isotopes obtained as by-products in production processes.

射线已被证实在医学和工业上有很大的用处，这些射线是在生产过程中由放射性同伴素释放出的副产品。

77. At that point, Mogensen started the laser-illuminated analyzer, which vaporized the incoming water and looked for variations in oxygen and hydrogen isotopes.

就在当时，摩根森开启了以雷射照明的分析仪，这分析仪会将流进来的水蒸发，研究其中氧与氢同位素的变化。

78. Yet Australia has problems of its own with its single, albeit newish reactor, and has recently been importing isotopes from South Africa.

尽管澳大利亚唯一的反应堆还是较新的，但仍存在不少问题，最近澳大利亚一直在从南非进口同位素。

79. The oils in Guantao Formation of this area have been classified based on the analysis of carbon isotopes of group composition and the biomarkers.

应用族组成碳同位素和生物标志化合物相结合的分析方法,对该区馆陶组的原油进行了分类,并进行了精细油源对比。

80. Dissociative adsorption study of hydrogen isotopes on metal platinum surface by thermodynamic computation[J].

引用该论文 胡胜,汤丽娟,朱正和,朱祖良,罗顺忠,王和义,罗阳明,肖成建.