您要查找的是不是：
- isotope ratio measurement 同位素测定
- The isotope ratio is directly used for comparing oils or gases. 同位素比率直接用于比较各种石油或天然气。
- Assessment of Interferences in Cu Isotope Ratio Measurements Using Multiple-Collector Inductively Coupled Plasma Source Mass Spectrometry 多接收电感耦合等离子体质谱Cu同位素测定中的干扰评估
- The atmospheric helium isotope ratio: Is it changing? 大气氦同位素比率在变化吗?
- Stable isotope ratio analysis is an effective method for the identification of fruit juice adulteration. 稳定同位素分析法就是根据这种差异对掺假果汁进行准确鉴别的有效方法。
- There are differences between natural and adulterated juices in stable isotope ratio. 天然果汁与掺假果汁之间在稳定同位素比率方面存在着差异。
- To be sure, some scientists suggest that life could have evolved differently on Titan than on Earth or that the inorganic isotope ratio may be different there. 不过，还是有些科学家指出，可能是泰坦和地球上的生命演化过程不同，或是无机同位素比率不一样。
- Fibre optic communication subsystem test procedures - Part 2-2: Digital systems - Optical eye pattern, waveform, and extinction ratio measurement. 摘要:纤维光学通信子系统试验程序。第2-2部分:数字系统。光眼图、波形和消光比的测量。
- Analytical services include potassium-argon age determinations, stable isotope ratio analyses, radiocarbon age determinations as well as other radiometric analyses. 分析包括钾-氩测年，稳定同位素丰度分析，放射性碳测年，以及其他放射性分析。
- We extend a recently developed technique, OPA-based contrast ratio measurement in the scanned configuration, to the case of single-shot measurement. 本论文主要研究单脉冲高动态范围信噪比的测量方法及信噪比的改善方法。
- This consistence proves that the ADO method is reliable. The advantages of the ADO method over the traditional DCO ratio measurement have been discussed. 总结此方法与传统的角分布和DCO测量方法相比所具有的优越性 .
- An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers. 使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
- CAN STABLE ISOTOPE RATIOS PROVIDE FOR COMMUNITY-WIDE MEASURES OF TROPHIC STRUCTURE? 稳定性同位素与群落营养结构?
- Isotope ratios of Pb contained in wares were measured using Time-Of-Flight Secondary Ion Mass Spectrometry(TOF-SIMS)without any references. 介绍了用飞行时间二次离子质谱法对器物中的铅同位素比值的测量。
- First, it is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations. 第一，它是全球性的记录：来自不同大陆位置的沉积物样品其同位素比例变化非常之小。
- A case fatality ratio measures the proportion of all people with a disease who will die from the disease. 病例病死率计量所有人群中死于所患疾病的比例。
- Electrode experiment equipment was developed,and electrostatic spraying charge-mass ratio measurer was developed. 开发了电极试验装置，并自制了荷质比测试装置。
- gas isotope ratio mass spectrometer 气体同位素比质谱计
- Activity ratios measure how effectively the firm is using its assets. 资产运营指标衡量企业运用资产的效率。
- electron charge mass ratio measurement 电子磁聚焦
