The analysis of dynamic atmospheres containing known concentrations of volatile organic compounds (VOC) has shown the Langmulrlan behavior of these chemical species when adsorbed on Tenax GC. Equations for the prediction of breakthrough volumes In mixtures with high VOC concentration and Important competitive adsorption effects have been developed. These equations are defined from Individual compound parameters such as adsorption capacity, rn^a" and distribution coefficient, b. They can also be used to evaluate the correct conditions for the application of other more conventional methods for breakthrough prediction such as the retention volume approach. The lack of dependence of mu, and b on the gas-phase concentration of the organic species suggests that these are the parameters to take as reference data for the characterization of the adsorption properties of VOC.
Measurements of redshifted 21[Formula: see text]cm emission of neutral hydrogen at [Formula: see text][Formula: see text]MHz have the potential to probe the cosmic “dark ages,” a period of the universe’s history that remains unobserved to date. Observations at these frequencies are exceptionally challenging because of bright Galactic foregrounds, ionospheric contamination, and terrestrial radio-frequency interference. Very few sky maps exist at [Formula: see text][Formula: see text]MHz, and most have modest resolution. We introduce the Array of Long Baseline Antennas for Taking Radio Observations from the Sub-Antarctic (ALBATROS), a new experiment that aims to image low-frequency Galactic emission with an order-of-magnitude improvement in resolution over existing data. The ALBATROS array will consist of antenna stations that operate autonomously, each recording baseband data that will be interferometrically combined offline. The array will be installed on Marion Island and will ultimately comprise 10 stations, with an operating frequency range of 1.2–125[Formula: see text]MHz and maximum baseline lengths of [Formula: see text][Formula: see text]km. We present the ALBATROS instrument design and discuss pathfinder observations that were taken from Marion Island during 2018–2019.
Measurements of redshifted 21-cm emission of neutral hydrogen at 30 MHz have the potential to probe the cosmic "dark ages," a period of the universe's history that remains unobserved to date. Observations at these frequencies are exceptionally challenging because of bright Galactic foregrounds, ionospheric contamination, and terrestrial radio-frequency interference. Very few sky maps exist at 30 MHz, and most have modest resolution. We introduce the Array of Long Baseline Antennas for Taking Radio Observations from the Sub-Antarctic (ALBATROS), a new experiment that aims to image low-frequency Galactic emission with an order-of-magnitude improvement in resolution over existing data. The ALBATROS array will consist of antenna stations that operate autonomously, each recording baseband data that will be interferometrically combined offline. The array will be installed on Marion Island and will ultimately comprise 10 stations, with an operating frequency range of 1.2-125 MHz and maximum baseline lengths of ∼ 20 km. We present the ALBATROS instrument design and discuss pathfinder observations that were taken from Marion Island during 2018-2019.
Les caractéristiques métrologiques des appareils de surveillance de la pollution atmosphé rique font l'objet d'u ne évaluat ion selon la norme N F X20-300. L'ap plication de cette norme aux appareils de type Lidar pose des problèmes méthodologiques particuliers pour lesquels une solution adaptée a pu être trouvée. L'évaluation du Lidar Elight 510 M a ainsi pu être réalisée avec S02 comme polluant. Les résultats ont été satisfaisants .
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