气体测量

DOAS can be used not only to the measurement of air pollutants near the surface, but also to the measurement of column density of air pollutants, even in the global monitoring of air pollution by satellite instruments.

这种方法不仅可以用在大气污染气体浓度的近地面测量上，还可以用来测量大气污染气体的柱浓度，以及用到卫星仪器对大气污染状况的全球测量上。

The effect of spectra resolution on the detected characteristic absorption structure of gaseous pollutants and the variation of differential cross section of gaseous pollutants with the change of resolution are studied.

主要研究了光谱分辨率对污染气体被检测到的特征吸收结构形状的影响，以及差分吸收截面随分辨率的变化趋势，从而确定了光谱分辨率对污染气体最低可检测浓度的影响，通过研究分辨率与光强的关系，确定了分辨率与信噪比的函数关系式，得出了DOAS测量NO2，O3和SO2的最佳信噪比范围，对多种污染物标准气体进行了同时监测，计算出标准气体在不同光谱分辨率下的测量误差，确定了对NO2，O3和SO2监测的最适用的分辨率范围。

This paper introduced the use of differential pressure meters which use a double cone as the primary differential pressure producer.

美国的煤层气生产者在煤层气计量方面面临的挑战主要包括：在煤层气井口进行准确的气体流量测量的同时，在测量系统的两端要保持一个低的差压值；要妥善处理流量计测量管段中的湿气体问题等。

The principle of measurements of speed of sound in gaseous phase is discussed and a cylindrical variable-path acoustic interferometer is described.

介绍了干涉法测量气体声速的试验原理和变程干涉声速测量的实验系统，使用本套测量系统测得的气体声速的精度可达5×10-4。

This shows in practice that hydrocarbon and mercury gas survey is effective and has wide application.

这从实践的角度证明了烃汞气体测量技术的实用性，并具有广阔的应用前景。

Venturi tubes may be used for gas measurement on line sizes 350 mm and larger.

文丘里管可以用于350 mm和更大尺寸的管线的气体测量。

The zero ring downsignal is achieved by measurement of the sample gas without the absorbing species, e.g.

零环下信号被通过不吸收的物种比如 NO3 自由基测量后化学滴定法与 NO NO3 添加到该检测单元格的情况下，示例气体测量。

The index of flame retardant property,material,product structure and relevant method of test of the antiflaming flexible cable is established according to the standard of GB/T18301-2001《the Third Part of Burning Test of cables in the Condition of flame:Method of Buring Test of Bunchy Wires and Cables》.The Cable will emanate the bad gas in buring to causethe the second calamity,so the smoke capacity of the cable in burning should be tested according to the standard of IECl034-2(1991)《the Second Part of Method of Smoke Concentration Test ofCable 1n Burning:Procedure and Requirement ofTest》The Liberation of Gas 1n burning is tested according to the standard of IEC754-2(1991)《the Second Part of Test of Liberatlon of Burning Materlal from Cable:Method to Measure the ACidity with the Measured PH and Conductlvltv》.

对阻燃型软电缆所要求的阻燃性能指标，是根据GB/T18301-2001《电缆在火焰条件下的燃烧试验第3部分：成束电线或电缆的燃烧试验方法》标准的规定而确定其电缆的材料要求、产品结构和相应的试验方法；对于耐火性试验，并考虑到电缆在火焰中会散发有害气体，造成&二次灾害&，所以还规定了对电缆燃烧时发烟量进行试验，按IECl034-2(1991)《电缆在特定条件下燃烧的烟浓度试验方法第二部分试验步骤和要求》以及燃烧时析出气体按IEC754-2(1991)《取白电缆的村料燃烧时析山气体的试验第二部分用测量PH值和导电率来测量气体酸度的方法》进行试验。

You can put together a gas indicator system custom-tailored to your application from the different gas measuring systems and limit monitors.

用不同的气体测量系统和临界值报警器，可以组合成一个适合客户使用特点的气体报警系统。

First, based on the measurements of absorption cross-section, the absorption characters of the main polluted gases in flue gas were deeply studied, and found that SO_2、 NO、 NO_2、 NH_3 had a character of approximate periods absorption at some wave band, which is a good chance of a new measurement introduced. Secondly, the factors about absorption cross-section of the gases measured, which affect on the measurement precision of DOAS, is studied deeply. The influence of pressure and temperature on absorption cross-section was given special research, and the compensated measures were given to the gases based on the character of the gases. Thirdly, in practical measurement, it must have been satisfied that the monochromator was consisted with the reference spectrum, which was based on absorption cross-section. In order to satisfy the consistency, the technique of reversion in the image was introduced, the reversions of spectrums were realized with wiener filter and noise elimination based on wavelet transform.

首先从吸收截面的测量入手，对烟气中主要的污染气体SO_2、NO、NO_2、NH_3的吸收特性进行详细研究，发现这些气体在局部区域具有准周期吸收特征，这为引入新的测量方法提供了契机；其次，对决定DOAS测量精度的被测气体吸收截面的诸多问题进行了深入研究，重点研究了压力、温度对被测气体吸收截面的影响，并针对被测气体的特征提出了相应的修正措施；再次，在实际测量中，要求所使用的光谱仪必须与以吸收截面为基础的参考光谱相匹配，为了满足匹配这一条件，文中将图像复原技术引入到光谱复原，使用维纳滤波和小波消噪实现了光谱的复原，将复原后的光谱与所使用光谱仪的仪器函数卷积，即可实现；最后，在对DOAS测量原理详细分析的基础上，对传统的最小二乘—差分吸收光谱法进行了详细的阐述，通过实验证实两点：1。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。