2) quadrupole mass spectrometer
四极质谱
1.
Low-noise and wide-band design of composite preamplifier in quadrupole mass spectrometer;
四极质谱检测中复合放大器的低噪声高带宽设计
2.
Two samples of a set of national standard water samples which have natural level ratio of D and H are set as standards and the other two as unknown samples,a linear calibration method with equal H2+ is studied on GAM400 quadrupole mass spectrometer.
以氘丰度为天然水平的国家一级标准水样中的两个样品作为标准,另外两个样品作为测试样品,在GAM400四极质谱计上探索了等氢分子离子H2+线性校正测量值的方法。
3.
In the paper,hydrocarbon types of gas_oil have been analyzed by a quadrupole mass spectrometer according to the requirements of ASTM D2786 and ASTM D3239.
应用四极质谱仪按ＡＳＴＭＤ２７８６和ＡＳＴＭＤ３２３９分析方法要求对重馏分油的烃类组成进行分析。
3) High-quality cathode
优质阴极
4) polarography property
极谱性质
5) the geologic limit
地质极限
1.
The pauthors discussed the geologic limit that is the ability that the geologic environment of a city can support suth pressure and analyzed the burst factor.
讨论了城市地质环境承受这种压力的能力———地质极限,并分析了其触发因素,建议采用综合熵来量化地质极限的判定标准。
6) Quadrupole mass spectrum
四极质谱
1.
In this paper a new dynamic measuring method of exhaust gas from internal combustion engines using Quadrupole mass spectrum is reported.
分析了四极质谱的基本原理 ,介绍了采用四极质谱动态测量内燃机排气成分的方法及实现动态检测的系统方案和动态测试结果。
补充资料：“质子-电子偶极-偶极”质子弛豫增强
“质子-电子偶极-偶极”质子弛豫增强
物理学术语。原子核外层中不成对的电子质量小，但磁动性很强，可使局部磁场波动增强，促使氢质子弛豫加快，从而使T1和T2缩短，这种效应即为PEDDPRE。过渡元素和镧系元素大部分在d和f轨道有多个不成对电子，所以其离子往往具有PEDDPRE，可用来作顺磁性对比剂，如钆(Gd)。Gd在外层有7个不成对电子，具有很强的顺磁性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条