查询词典 isotopic

Samples of Jurassic shells, which are a portion of the collection used to the benthicassociations of Lusitanian basin, Portugal, are subjected to analysis of stable carbon isotopic composition for reconstructing palaeosalinity.

碳同位素的古盐度表明，葡萄牙卢酉塔尼亚盆地在侏罗纪时曾是一半咸水海湾，其水体含盐度低于24‰。，所以生物组合中以机会种和半咸水地方性种占优势。

Jurassic ; Lusitanian basin; carbon isotopic composition ; Paleosalinity

侏罗纪；葡萄牙卢西塔尼亚盆地；碳稳定同位素成分；古盐度

The influences of some relevant parameters on resonance ionization efficiency in the recent laser pulse time-delayed scheme were analyzed with the framework of time-dependent Schrdinger equation. As a versatile example, the feasibility of this scheme applied to lutetium isotopic analysis by Laser Resonance ionization Spectrometry was discussed.

针对宁西京教授提出激光脉冲延时方案，在含时薛定谔方程理论框架下探讨了各种参数对激光共振电离效率的影响；并以镥原子共振电离为例，探讨了该方案用于激光共振电离质谱同位素分析的可行性。

To 6500m a.s.l.. In September 1998, an 80.36m ice core was also recovered in accumulation zone of the East Rongbuk Glacier on the northern slope of Mount Everest. The ice core was dated by seasonal variations of δ〓O (measured by Mat-Plus gas isotopic mass spectrograph with precision of 0.5‰) and major ions (measured by DX-2010 ions chromatography with precision of ng/L), together with the references of β activity peaks. Annual net accumulation was reconstructed based on the dating and density profile of the ice core.

此外，笔者还参加了1998年9月东绒布冰川80.36m冰芯的钻取工作。1999-2000年，在实验室内对上述样品进行了δ〓O测量(在中科院寒区旱区环境与工程研究所冰芯与寒区环境开放研究实验室用Mat-Plus气体稳定同位素质谱仪测量，以δ〓O平均值为-20.05‰的希夏邦马峰地区大气降水作为标准水，测量精度为0.5‰)、主要可溶性阴阳离子浓度的测定(在美国新罕布什尔大学气候变化研究中心进行，测试仪器为DX-2010型离子色谱仪，其测量精度可达ng/L)以及β活化度的测量(在美国新罕布什尔大学气候变化研究中心进行)，并以此为基础尝试重建了该冰芯的年代和净积累量。

The isotopic composition of hydrogen and oxygen in heavy water are analyzed by using a high-resolution mass spectrometer.

用高分辨率质谱计分析了重水中氢与氧的同位素组成；分析了重水的分子组成、质谱中的单电荷离子；利用高分辨率质谱峰相对强度，计算了重水中的氢氧同位素组成。

The Secondary Ion Mass Spectrometer, especially dynamic SIMS, is the most suitable instrument for particle isotopic analysis.

动态型二次离子质谱仪是进行微粒同位素分析最适用的测量仪器之一。

Based on the method of matrix transformation used in the compound material mechanics, the anisotropic flexibility matrix of the anisotropic sand with a certain stress state is transformed to be an isotopic one of a certain isotropic reference material with the corresponding stress state, and a corresponding stress matrix is obtained simultaneously.

借鉴复合材料力学中矩阵转换的数学方法，将各向异性砂样的柔度矩阵转化为各向同性等效参考砂的柔度矩阵，同时导出与其相当的应力状态的表达式，以使对各向异性岩土材料的分析可转换为对各向同性状态进行分析，由此可将以前基于各向同性假设的强度条件能够用于各向异性土体。

The reasons for higher initial Sr isotopic ratios are probably that there is enriched mantle endmember and the ophiolite underwent metasomatism of fluid from the melting of terrestrial matter in the course of formation.

ISr值偏高可能是存在富集型地幔源区和蛇绿岩形成过程中经受了地幔流体的交代作用引起的。

The development of isotopic techniques opened a new field in microelement study.

最后强化剂在食品中的生物利用率处于可接受范围。

In this paper, the geochemical characteristics of granite in Jiangjunzhai tungsten deposit and the Re-Os isotopic dating of molybdenite from quartz-wolframite veins were studied and carried out, in order to elucidate the timing of mineralization and reveal the time limites and geodynamic setting of large-scale metallogeny in Southeast Hunan.

文章研究了白云仙矿田将军寨钨矿花岗岩的地球化学特征，并进行石英脉型黑钨矿石中辉钼矿的铼－锇同位素定年，以精确厘定将军寨钨矿的形成时间，揭示湘东南地区钨、锡等有色金属成矿的时限及其地球动力学背景。

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。