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
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。
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。
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。
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。
three-dimensional quadrupole mass analyzer
三维四极质量分析器
triple tandem quadrupole instrument
三级串联四极质谱计
gas chromatograph-quadpole mass spectrometer
气相色谱四极质谱仪
A carbonaceous electrode in an electric cell.
碳（精电）极电池里的碳质电极
Perhaps he may become extremely nervous and excitable.
他可能会变得极度神经质与极度兴奋。
The state or quality of being positive.
积极性积极的状态或性质
cathodic protection parasites
妨碍阴极保护的物质
Quality extremely fiery buyers refuse taking delivery
质量极差，买主拒收货物。
Such a substance is called a depolarizer.
这种物质称为去极剂。
a filmy cotton blouse
极薄的棉质女衬衫.
non-polar organic-dielectric capacitor
非极性有机介质电容器
anodized dielectric film
阳极氧化的介质薄膜
polarity glioblastoma of craniocerebrum
颅脑极性成胶质细胞瘤
The hostages wept for joy on their release.
人质获释时喜极而泣.
Polarity is inherent in a magnet.
极性是磁铁的固有性质。
single-heterojunction laser diode
单异质结激光二极管
heterojunction bipolar transistor
异质结双极型晶体管
double heterojunction laser diode
双异质结激光二极管