同位素

A method for determination of isotopic abundances of lithium based on the principle of isotopic dilution mass spectrometry was studied.

研究了基于同位素稀释质谱法原理准确测定锂同位素丰度的方法，编制方法的求解方程。

In the power station the nuclear fuels are completely burnt without some long-lived radioactive wastes both of heaVy actinide and fission products.

核电站将20％电能供给加速器运转，80％电能并入电网。同时电站还可输出十分稀有的稳定同位素和短寿命医用同位素，作为副产品供应市场。

This implies a major stage of crustal growth in Proterozoic time and remelting of the crustal material in Early Jurassic time;(5) The Oligocene-Miocene adakites contain magmatic zircons that show similar Hf isotope compositions to the Cretaceous-Paleogene Gangdese batholiths, providing a key constraint that allows evaluation of the nature and timing of crustal thickening in southern Tibet owing to the India-Asia collision; and (6) As a whole, the Hf isotope information observed in zircons from the above Transhimalayan rocks demonstrates a temporal variation in εHf values, and thus TDMC ages, that suggests multiple stages of orogenic or crustal formation events.

五、渐新世、中新世的埃达克岩，其岩浆锆石的铪同位素特徵与白垩纪、古第三纪冈底斯岩浆相似，因而为藏南在印亚碰撞以后，地壳增厚的时间与机制提供了关键性的制约；六、综观上述藏南火成岩中的锆石，它们与时变化的铪同位素初始值及其对应的模式年龄记录了拉萨地块多阶段的造山与地壳形成历史。

According to the research of Pb isotopic, the metallogenetic material mainly originated from the Permian basalts; the study of sulfur isotopic find that the sulfur of the basalt-type copper deposits and carbonaceous sedimentary interlayers-type copper deposits originated from both Permian basalts and evaporate of sedimentary section, S in bauxitic mudstone-type copper deposits originated from evaporate of sedimentary layers.

研究区三种类型铜矿的铅同位素示踪研究，成矿物质主要来自于邻近的二叠纪玄武岩；硫同位素研究结果显示，玄武岩型铜矿和含碳沉积岩夹层型铜矿中的硫有两种来源：二叠纪玄武岩和蒸发岩中的硫；而铝土质泥岩铜矿中的硫主要来源于沉积地层中蒸发岩的硫。

Sulfur and Oxygen Isotope in Sulfate ①δ~(34)S values of sulfate in karst water are close to those of evaporite gypsum found incarbonate rock area, which implies that sulfate in karst water comes from gypsum dissolution,not from mantle.

5氦同位素~3He／~4He比值及R／Ra比值的分析表明，岩溶热水的氦同位素主要为大气、壳源氦混合而成，无明显三元混合特征，指示了当地热水中不存在岩溶水与幔源热水的混合。

Results The rate of dietary iron absorption in young Tibetan men was 13.4%±6.4% with good linear correlation between daily fecal excretions of iron tracer and Dy.

铁有4种天然丰度组成相对固定的稳定性同位素(stable isotope，SI)，共同池理论认为各种同位素在人体内的代谢完全等同[1]。

Periodic Table Ⅵ B family silver-white metallic luster of the solid metal transition element, atomic number Z = 74, atomic weight of 18385, chemical symbol W, there are five kinds of natural F stable isotopes, 18174W, 18274W, 18374W, 18474W, 18574W and eight kinds of radioisotopes .

周期表中ⅥB族银白色金属光泽的固体金属过渡元素，原子序数Z＝74，原子量18385，化学符号W，有五种自然F 稳定同位素，18174W、18274W、18374W、18474W、18574W和八种放射性同位素。

The carbon isotope data of carbon dioxide, 3He to 4He rado and the inverted sequence of methane-ethane-propane isotope proved that the gas reservoirs in this area were resulted from the inorganic mantle source gas.

CO2的碳同位素资料，3He / 4He比值及甲烷、乙烷、丙烷同位素的倒序证明了该区的气藏属于无机幔源气。

Relation between the Granite Series and Types, Strontium Isotope Compositions and Isobaths of Moho Surface in South China: Distirbution of Granite Series/Types Restricted by the Analysis of Strontium Isotopic Tendency Surface and the Depth Variation of Moho Surface

华南花岗岩分类与鍶同位素和莫霍面的关係：花岗岩系列／类型分佈与鍶同位素趋势面分佈和莫霍面深度变化的制约，王联魁；王谦身；徐文新；陈根文；张绍立-66文免费论文库，大学生论文库

Most elements found in nature are mixtures of several isotopes; tin, for example, has 10 isotopes.

自然界里的大多数元素都是几种同位素的混合；例如锡，有十种同位素。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。