查询词典 isotope

The geologists have attached much importance to the particularity of ReOs isotopic system and its application is getting popular. The author sums up and compares several kinds of sample digestion methods for ReOs isotope analysis (NiS fire assay, Carius tube digestion, high pressure asher, leaching, and water disposing), the procedures of separating Os ( conventional distillation, liquid Br2 and CCl4 or CHCl3 extraction, rapid extraction with low blank, minitype distillation) and purifying Os, improved mass spectrometry measurement of Os isotope and its application progress in the earth science research brought along the improved measuring method.

总结和对比了近年来ReOs同位素分析中样品分解的不同方法（NiS火试金法、Carius管溶样法、高压灰化消解法、浸提法、水样处理法）、Os的分离（常规蒸馏、液溴和CCl4提取、快速低本底提取、小型蒸馏）与纯化流程、Os同位素比值质谱测定法（NTIMS、ICPMS、微区原位分析）及随测定方法的改进ReOs同位素体系在地球科学研究中的应用进展。

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。

High oxygen isotope temperatures of 650 to 695℃ were obtained when pairing quartz with such resistant minerals as garnet, zircon and kyanite, suggesting that the refractory minerals have preserved their oxygen isotope compositions acquired during eclogitization and only suffered much weaker retrograde metamorphism than the other minerals in the eclogite.

石英-耐熔矿物对氧同位素温度主要集中在650～695℃之间，表明耐熔矿物石榴石、锆石和蓝晶石在该区榴辉岩中相对其它矿物来说保存最好，退变质作用最弱，因此其氧同位素温度与峰期超高压榴辉岩相变质奈件基本一致。

However, the helium isotope analysis data are quite different between them. The abnormal of helium isotope made sure of extraterrestrial origin of iron cosmic spherules.

宇宙球粒的氦同位素分析值却截然不同；3He/4He×10^(-8)分别为：57.50±2.16和1.23±0.43；4He×10^(-8)cm^3 STP/g分别为：55.54和809.6；然而宇宙球粒的氦同位测定值都比各自的母岩高出许多；氦同位素的异常为所发现的宇宙球粒的地外来源更加确定。

Introduction of C 4 food had strong effect on stable isotope metabolism (especially for stable nitrogen isotope) of plateau pikas.

介绍了同位素分馏的基本概念以及利用稳定同位素研究水体蒸发的基本原理。

Introduction of C 4 food had strong effect on stable isotope metabolism (especially for stable nitrogen isotope) of plateau pikas.

则K上的每一个广义斜导子μ能被唯一地扩展到RF和Q 上。设R是一个素环

The efficiency of isotope exchange was only 2.84%, namely, the amount of less than 3% tritium was exchanged out of the glass uranium bed by deuterium, and after isotope exchange proceeded time after time, its standard deviation was 7.35%.

同位素交换法测量铀床氚的结果如下：加热充分解吸过的铀床经多次同位素交换后，其交换效率仅为2.84%，即不到3%的氚被氘气载带出来，其同位素交换法测量的标准差为7.35%。

There are thermoluminescence-photoluminescence meter, high accuracy liquid scintillation counter, hot surface ionizing isotope mass-spectrometer, solid isotope mass-spectrometer, multichannel electro-inductance coupling plasma mass-spectrometer, inert gas mass-spectrometer and their corresponding laboratories.

现拥有热释光-光释光仪、高精度液体闪射记录仪、热表面电离同位素质谱仪、多通道电感耦合等离子质譜仪和惰性气体质譜仪等仪器及相应的年代学实验室。

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。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。