同位素

At 95% confidence level the relative expanded uncertainty of the present method for determination of lithium isotopic abundance ratio is estimated to be 0.26%.

结果显示，在95%的置信水平下，应用这种方法测定锂样品同位素丰度比值，其相对扩展不确定度为0.26%。

The operating parameters to determine the isotope abundance ratio for 〓Pu/〓Pu by ICP-MS were optimized for the first time in China.

采用优化的仪器条件，测定了〓Pu／〓Pu的比值。将同位素稀释法应用于ICP-MS，测量了环境样品中Pu的含量。

DDT, PAHs, PCB, organo-metals, fossil remains, and biochemical markers such as organic carbon compounds can provide indicators of past natural and anthropogenically induced changes.

在沉淀物里，矿物质含量，磁化率，主要，微量元素，稳定同位素，混合的具体的同位素和有机的地球化学(例如DDT，对氨基苯甲酸，PCB，organo 金属)，化石保持，并且象有机的碳化合物那样的生物化学的记分员能提供经过自然的指示器，anthropogenically 引起变化。

The rare gas isotopic ratio in the fluid inclusions of the samples is determined, and the influence caused by all kinds of latter processes from the measured data is ruled out.

测试样品流体包裹体中的稀有气体同位素值，从测试值中排除掉包裹体形成后各种后生过程对流体初始同位素组成的影响。

Re is moderately incompatible element, while Os is highly compatible. As they are highly siderophile, ReOs isotopic system can provide unique insight in dating and tracing research compared to other longlived radiogenic isotope systems (e.g. RbSr, SmNd, UThPb ) which involve lithophile elements partitioning into silicate rather than metal or sulfide.

Re为中等不相容元素，Os则属强相容元素，与母子体均为不相容元素的RbSr、SmNd、UThPb等同位素体系相比，具亲铁、亲硫性的ReOs同位素体系在定年和示踪研究中显示出特殊性，受到了地学家高度重视，其应用正走向普及。

The neutrons are generated by bombard ing a heavy form of hydrogen, called tritium, with a lighter isotope of the gas, called deuterium. The resulting collisions create helium atoms and a stream of neutrons.

中子是通过氢的一种名叫氘的较氚轻的同位素来撞击它的一种名叫氚的重同位素而产生的，它们之间发生的碰撞创造了氦原子和中子流。

Heavy water ; hydrogen isotope ; oxygen isotope ; mass spectrum

重水；氢同位素；氧同位素；质谱

The heavy hydrocarbons of coal-derived gas associated with fresh lacustrine and marsh have relatively hydrogen light isotope but those related with marine environments have relatively heavy hydrogen isotope.

淡水湖沼相烃源岩生成的煤成气相对富集氢同位素氕，而海相烃源岩生成的煤成气则相对富集氢同位素氘。

They not only occur in deep ocean basins such as in the central North Atlantic where they were deposited below CCD, but they extend up the continental slopes and rises, such as in the Alps, including the Gampu area , in the Carpathian Mountains (Austria, Slovakia, Poland, Romania), in Spain, in Turkey and in the Exmouth Plateau (Legs 122 and 123) in northwest Australia.The Upper Cretaceous reddish marlstones in Italy are particularly similar to the Upper Cretaceous Chuangde formation red beds in the Tibetan Himalayas. In summary, the Upper Cretaceous redbeds have several characteristic as follow:(1) very low TOC, only 0～0.3%;(2) wide distribution throughout the Neo-Tethys, from north Atlantic to the west, to Exmouth Plateau to the east;(3) Sedimentary environment of the red beds varied from oceanic basin, to slope/rise, to outer shelf. Most comment is pelagic and hemipelagic.

床得组泥灰岩〓含量0.26～5.62％，远远高于奥地利和意大利红层0.45～0.82％，并出现金属元素高含量，平均达926ppm，以高含量Ba、Cu、Zn、Cr、Ni、Th等元素为特征；2）床得组红层〓相对于定日地区同期海相碳酸盐〓整体负向偏移量达2.0‰，而在其床得组红层内部〓自下而上一直攀升，自-1.5‰～0.0‰之间上升到0.0‰～1.0‰之间；定日贡扎剖面相当于江孜床得组红层的Santonian-Campanian期，〓也出现一弱负向偏移，偏移量达-0.8‰；3）红层内锶同位素〓比值为最低值，同期定日地区也出现锶同位素低值；4）床得组部分层段的泥晶灰岩出现丰富的有孔虫，其中尤以浮游有孔虫最为繁盛，与江孜地区临近的浅海陆棚相的定日—岗巴地区此时期出现自Cenomanian-Turonian界线生物绝灭后的生物辐射期。

So it is very necessary to use carbon isotope to study formation of the Precambrian Era especially Palaeoproterozoic.

因此采用碳同位素等稳定同位素进行前寒武尤其是古元古代及以前的研究非常必要。

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。