气体的

First the traditional non-optical detection technology for gas concentrations is briefly introduced, such as ultra-sound technology, gas sensing, catalytic thermal, gas chromatography, interferometry applications, and then the spectral analysis based on the concentration of gas detection is discussed. The latest technological developments on the differential absorption spectroscopy, Fourier transform infrared spectroscopy, tunable laser diode laser absorption spectroscopy, laser radar and differential absorption Raman scattering laser radar, laser-induced fluorescence spectroscopy, laser Photoacoustic Spectroscopy are reviewed in detail.

首先对传统的非光学气体浓度检测技术作出了简单的介绍，包括超声波技术、气敏法、热催化法、气相色谱法、干涉法应用技术，被动检气管法，然后重点阐述了基于光谱学分析气体浓度检测技术的最新发展动态，其中分别对差分吸收光谱技术、傅里叶变换红外光谱技术、可调谐激光二极管激光吸收光谱技术、差分吸收激光雷达和拉曼散射激光雷达、激光诱导荧光光谱技术、激光光声光谱技术进行了详细介绍，最后提出了现代气体浓度检测技术的发展方向。

The combustion process of high energy gas fracture in oil well is simulated with manometric bomb,the poisonous gas produced in the process is analyzed by infrared spectrum technique.

用密闭爆发器模拟高能气体压裂弹在油井中的燃烧过程，用红外光谱分析技术检测燃气成份中的毒性气体，测试了7个不同生产厂的高能气体压裂弹产品的燃气成份，并对特殊产品燃气中产生HCN机理进行了分析。

Based on the structural model for tracheid, the expressions of flow-resistors of tracheid in three directions of grain are reduced with the theories of fluid mechanics. The gas permeability of tracheids also...

计算结果表明，管胞流阻可以描述气体渗透阻力的分布情况，反映气体渗透性在 3个纹理方向的差异，在木材细胞层次揭示针叶树材气体渗透性的机制。

The research shows that there is not any published article introduce stablizer that used in gas drilling, thus there is no evaluation about the conventional auger drill stabilizer's impact on cutting-carrying and lifting ability of the annulus gas.

调研发现，公开发表的文献中，目前没有文章介绍专用于气体钻井的钻柱稳定器，也没有就气体钻井使用常规螺旋钻柱稳定器对环空气体携岩举升能力造成的影响进行评价。

With the help of modern computational fluid dynamics tecnology, this thesis carries on a numerical simulation of annulus multiphase flow of the conventional auger drill stabilizer; it points out the deficiency of the annulus gas in cutting-carrying and lifting; and attempts to develop a drill stabilizer that are suitable for the gas drilling.

本文试图借助现代计算流体力学技术，对常规螺旋钻柱稳定器环空多相流动规律进行数值模拟研究，指出在环空气体携岩举升方面存在的不足，开发一套适合于气体钻井的新型钻柱稳定器，提出全井段环空流场改善方法，实现气体钻井防斜打快，减少冲蚀，提高井眼净化能力的目的。

The invention is characterized in low check limit, high sensitivity, repeat application, and wide check air range, and the invention can be used to check various volatile harmful gas, more particularly check the discharge and leaked harmful gas as NO2, SO2, NO, CO, H2S and carbonyl chloride.

由于本发明传感器具有检测限低，灵敏度高，可重复使用，检测气体范围广等特点，故本发明可广泛用于检测人类生产生活环境中的各种挥发性有毒气体，特别适用于工业生产中NO 2 、SO 2 、NO、CO、H 2 S，及光气等有害气体排放合格性的检测及泄漏的检测。

They are used either to treat polluted air before it is released into the environment or to admit air with very low dust concentration into a process.

他们经常要么被用来在已污染的气体排放到环境之前处理这些污染的气体，要么将这些低粉尘浓度的气体加以吸收进行处理。

In this paper, the domestic and external development of the gas and dust explosion wassummarized.

本文综述了国内外气体粉尘爆炸研究的发展状况，探讨了气体粉尘的爆炸原理及特性，提出建立管道式气体粉尘爆炸实验装置的理论依据。

IST offers a complete line of instrumentation, including potables, single- and multi-point stationary instruments, stand-alone sensor transmitters, and computerized gas monitoring systems.

IST提供全系列的气体检测仪器，包括便携式、单点和多点固定式仪器、单独的气体传感变送器以及计算机化的气体监测系统。

In the present invention, platinum-carbon catalyst, perfluoro sulfonic acid resin solution and absolute ethyl alcohol are uniformly mixed under ultrasonic conditions; mixture is uniformly smeared on a micro-porous layer of carbon cloth or carbon paper in a brushing or printing method, and a traditional Pt/C gas porous electrode is obtained after drying; silicon oil is adopted to infiltrate into pores of a catalyst layer and a diffusion layer of the traditional Pt/C gas porous electrode, and then the ordering anti-drowning gas porous electrode is obtained after drying.

本发明是将铂碳催化剂、全氟磺酸树脂溶液和无水乙醇在超声波条件下混合均匀，采用涂刷或印制的方法将混合物均匀涂布到碳布或碳纸的微孔层上，干燥后制得传统Pt/C气体多孔电极；然后将硅油渗入到传统Pt/C气体多孔电极的催化层和扩散层孔隙中，干燥后制得有序化抗溺水气体多孔电极。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。