查询词典 isotopic

Geological timing methods established(isotopic method,paleontologic method,pale omagnetic method)set the "absolute age" or relative era of certain time in the geological process.

地质作用过程持续时间的确定具有重要意义。前人已建立的地质定年方法（同位素法、古生物法和古地磁法）给出的是地质事件的&绝对年龄&或相对年代。

They found that the SNC meteorites possess chemical, isotopic , and petrologic features consistent with data available from Mars at the time, findings further confirmed by Treiman et al.

应用火星侦察轨道器的高解析度影像，研究人员认为早期火山活动的增加、撞击事件或火星轨道的变化让温暖时期火星的大气层足以溶化大量地表的冰。

The petrological and isotopic features indicate that the Lisong enclaves and hosting granite were basically crystallized at the same time, but with different crust-mantle proportions and different sources.

岩石学和同位素地球化学特征也表明，里松包体和寄主花岗岩基本同时结晶，但壳幔比例和来源有所不同。

Fluorites formed in uranium mineralization period in the Zoujiashan and Shazhou uranium deposits have ε〓 values from -6.7 to -8.3 and I〓 values from 0.7145 to 0.7204, similar to their host rocks (porphyroblastic lava and sub-granodioritic porphyry) which have ε〓 values from -6.2 to -9.4 and I〓 values from 0.7121～0.7192. On diagram of ε〓- t, the fluorites and host rocks plot in similar area within the evolution field of the basement rocks at Xiangshan. The lead isotopic compositions of pyrites formed in uranium mineralization period plot as a line on diagram of 〓Pb/〓Pb vs.〓Pb/〓Pb. The host rocks plot at the lower value end. Calculation based on the slope of the line and the mineralzation age yields age of 144Ma for the geological body which provided uranium for the mineralization.

邹家山和沙洲铀矿床成矿期萤石的ε〓值(-6.7～-8.3)和I〓值(0.7145～0.7204)与赋矿围岩(碎斑熔岩及次花岗闪长斑岩)的ε〓值(-6.2～-9.4)和I〓值(0.7121～0.7192)相似，在ε〓-t图上，成矿期萤石数据点的投影范围与赋矿围岩的基本吻合，且均落在相山元古宙基底演化域范围内；成矿期黄铁矿的铅同位素组成在〓Pb/〓Pb-〓Pb/〓Pb关系图上呈线性分布，而火山岩的铅同位素组成位于此相关线的低值一端；利用异常铅线的斜率及成矿年龄计算出富铀地质体的形成年龄为144Ma，这与赋矿围岩的成岩年龄(135～140Ma)非常接近。

Isotopic anomaly ; presolar grain ; meteorite

同位素异常；太阳系外物质；陨石

The sulfur and lead isotopic geochemical characteristics of some deposits show that the ore materials mainly came from buried pulton. The invasion of pulton brings a great number of materials.

矿田中部分矿床的硫同位素、铅同位素的分析数据表明，矿床的Sn，Pb，Zn矿物质与岩体具有同源性，岩体的侵位过程为矿床的形成带来大量的矿物质。

Thus, saponifiable lipids and whole wood cannot be used for isotopic analysis in stable isotope dendroclimatology.

因此，树轮可皂化类脂的碳同位素组成(恐怕也包括氢、氧同位素组成)不能用来解译过去气候变化，全木因为含有可皂化类脂也不宜作为稳定同位素分析的目标物质。

The suspicion of cancer is increased by the following factors:(1) age (young patients are more susceptible);(2) sex, if the patient is a man (more women have thyroid cancer by a ratio of 2:1, but women have more thyroid disease by a ratio of about 8:1; thus, a man with a nodule should be regarded with greater suspicion);(3) a solitary nodule (multinodular lesions are usually benign unless there is a dominant cold nodule by thyroid scan);(4) a cold nodule on thyroid isotopic scanning (hot nodules are seldom cancerous);(5) a history of radiation exposure to the head, neck, or chest, especially in infancy and childhood (eg, for an enlarged thymus or enlarged tonsils, acne, or lymphoma);(6) radiographic evidence of fine, stippled psammomatous calcification or dense, homogeneous calcification;(7) recent or rapid enlargement; and (8) stony-hard consistency.

下列因素可增加癌的可疑性：(1)年龄；(2)性别，如果病人为男性(女性与男性的甲状腺癌比为2：1，但女性更多的是得甲状腺病，约为8：1，因此，男性有甲状腺结节时应考虑癌的可能性更大)；(3)孤立小结(多结节病变一般为良性，除非甲状腺扫描时呈明显的冷结节)；(4)甲状腺同位素扫描时发现冷结节；(5)有过头、颈、胸放射接触史，尤其是婴儿和儿童期(例如，因胸腺增大或扁桃体肿大、痤疮或淋巴瘤等)；(6)X线片见细、斑点状、沙粒样钙化或致密、匀质钙化；(7)最近增大或快速增大；(8)质地石头样坚硬。

Biomarker parameters of transgressive member have specific characteristics:Pr/Ph less than 1,higher abundance of steranes,abundance of C27 are similar to C29 stertane,tricyclic terpane with feature of C21＜C23＞C24 and isotopic composition of n-alkanes enriched 12 C.

在生物标志化合物参数方面表现为Pr/Ph小于1，甾烷含量丰富，甾烷中C27化合物丰度与C29相当，三环萜烷有C21＜C23＞C24的分布特点，单体烃同位素表现出富集轻碳同位素的特点。

Changxing Formation is the primary hydrocarbon source rock for the solid bitumen, while Feixianguan and lower Silurian are the subordination, according to the carbon isotopic compositions of the insoluble constituent and the biomarkers such as sterane and terpane in saturated hydrocarbons of the solvent extracts.

飞仙关组储层固体沥青的高温热变质成因是古油藏原油发生裂解的证据和标志。

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。