查询词典 isotopic

Owing to lack of formation temperature data of mylonites, such problems as the formation depth, metamorphic evolution, deformation mechanism, exhumation history of mylonites, relation with host rocks and explanation of isotopic age data are difficult to interpret correctly and reasonably.

提要：在缺少糜棱岩形成温度资料的情况下，糜棱岩的形成深度，与所叠加岩石的关系，变质演化，抬升-剥露历史，矿物的变形机制，同位素年龄数据的解释等一系列问题就很难得到正确合理的解释。

Studying the component activation, adjustment of isotopic system as well as the rule of chemical changes of rock-forming minerals in mylonites under the function of natural ductile shearing, becomes the key part of dynamic diagenesis and mineralization in ductile shear zones.

探索天然韧性剪切带剪切变形作用条件下糜棱岩岩石化学组分的变化、同位素体系的调整以及主要造岩矿物的矿物化学组成变化规律，构成韧性剪切带动力成岩成矿地球化学研究的核心内容和研究难点。

The La-ICP-Ms U-Pb zircon isotopic dating of granitic mylonites from that shear zoneprovides a magma crystallization age of 914.2-981Ma and indicates they are theNeoproterozoic products of tectonic-magmatic thermal events and the responses to theaggregation of Rodinia Super-continent in this area.

运用LA-ICP-MS法对韧性剪切带内的花岗质糜棱岩进行了锆石U-Pb定年，获得其原岩结晶年龄为914.2～981Ma，显示出均为新元古代早期构造岩浆活动产物，是全球Rodinia超大陆聚合在本区的响应。

Isotopic age studies of the zircons from both the metamorphic rocks and their anatectic derivatives by the single crystal U-Pb method have been carried out by the authors.

河北平山小觉地区早前寒武纪阜平群的部分岩石，在经历了区域变质高峰之后，又遭受了差异性深熔作用的改造。

The variations of helium isotopic ratios can be observed in these xenoliths andxenocrysts from different area, or even from same area, indicating that the xenocrysts didntdirectly crystallize from basaltic magma, and basaltic magma is not directly related to thesemantle lherzolites xenoliths.

提出幔源包体和高压巨晶的氦同位素组成均反映了其地幔源区的特征，与寄主玄武岩无必然成因联系。

It is difficult to study directly ore-forming hydrogeochemistry of sandstone type uranium ore in arid area, therefore, author have found out the laws of solution, precipitation and migration of uranium minerals in the groundwater using the mechanism of water rock interaction and uranium, thorium and their isotopic ratios, and have probed into the relation between uranium ore-forming hydrogeochemistry condition, hydrogeochemistry environment and uranium ore-body fixed position by studying the epigenetic hydrogeochemistry trackways in the rock.

由于干旱地区对砂岩型铀矿成矿水文地球化学研究困难，难以取水样直接研究。因而在研究方法上，作者运用水岩相互作用原理和铀钍及其同位素比值，查明地下水中铀矿物溶解、沉淀和迁移规律；通过研究岩石中留下的水文地球化学形迹，探讨铀成矿水文地球化学条件、水文地球化学环境及其与铀矿体定位的关系。

A less-detailed isotopic analysis suggested that tapirs and rhinolike creatures also spent their winters in the Arctic.

一份不是很详细的同位素分析显示貘和类似犀牛的动物也在北极过冬。

Synthesized researches on biotic evolution, alternation and accurate chronological dating, taphonomy of vertebrate or invertebrate fossils and elemental or isotopic geochemistry of bones of fossils and sediments, i.e., HBCNOS and COSr, could help us to well understand the biotic and environmental response to the geological events on the Earth surface system and reconstructed the palaeogeography, palaeoecologic environment and palaeoecosystem of the Late Mesozoic, North China.

陆地生物群分布、演化、更替与精确定年，脊椎无脊椎生物埋葬特征，生物演化速率、消长关系和生物群更替的形式和性质，以及脊椎动物骨骼、牙齿的常量、微量元素、H-B-C-N-O-S 和C-O-Sr等地球化学特征的研究可以恢复和重建古地理、古生态环境和古生态系统。

The syenites have more depleted Sr-Nd isotopic compositions εNd(t =+3.4-+4.3, ISr=0.703 03-0.703 44 and younger Nd model ages (TDM=0.6-0.7 Ga) than the coeval mafic dikes.

样品具有较区内同时代基性岩脉更为亏损的Sr-Nd同位素组成εNd(t=+3.4～+4.3、ISr=0.703 03～0.703 44和更为年轻的Nd模式年龄(TDM=0.6～0.7 Ga)。

Employing a general Monte Carlo code MCNP, the following Monte Carlo calculations which are important in the design of PAN shufflers were done:(1) optimization of moderators;(2) detection efficiency variation with the position of a neutron source;(3) multiplication effects and self-shielding effects;(4) isotopic effects;(5) shielding properties of the storage chamber and the assay chamber;(6) the relation between 〓Cf source strength and background neutron count rates.

文章详细讨论了无源方式下中子总计数分析和符合计数分析以及有源方式下缓发中子分析的基本原理，在此基础上，运用通用蒙特卡罗程序MCNP计算了桶装废物分类装置研制过程中所关心的一系列问题：慢化体的优化设计、探测效率随中子源位置的变化情况、增殖和自屏蔽效应、同位素效应、贮存室和测量室对〓Cf源的屏蔽能力、〓Cf源强度与本底计数率的关系，等。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。