Gasthermochrormtography/Carrier-free lead on quartz surfaces/ Argon and hydrogen carrier gases /Deduced adsorption enthalpies and entropies
SummaiyThe thermochromatography of lead on quartz surfaces was studied over a broad ränge of the experimental Parameters gas flow rate and heating time. The carrier gases argon and hydrogen were used, Although in both cases elemental lead was applied to the Chromatographie system, from the experimentally determined deposition temperatures very different adsorption enthalpies A^^ of -498 and -222 kJ mol"' and adsorption entropies ASJ of -427 and -222 J mor' K"', respectively, were obtained for lead in the two carrier gases argon and hydrogen.
The fine particles (PM2.5) has become a major air pollution problem in China, and PM2.5 mass concentration monitor was used to measure the concentration of PM2.5, and whether it is accurate or not determines the quality of the atmosphere. In this study, the uncertainty of the calibration device of PM2.5 mass concentration monitor was estimated. By analyzing the source of the uncertainty of calibration device, the analytical method of the uncertainty was determined. It was proved that when the aerosol concentration were 50μg/m3, 200μg/m3 and 500μg/m3, the expanded uncertainty of the calibration device were 0.90%, 0.90% and 10.02% respectively, and it showed that the major influence factor of the uncertainty of the calibration device was the mass concentration indication error.
Abstract. Smart Distribution Grid is an important part of Smart Grid and its operating conditions directly affect the effectiveness of the industry. In order to achieve the goal of real-time and reliability of data transmission of Smart Distribution Grid, we design a smart multi-antenna distribution communication system of multi-channel based on Mesh Networks. Elaborated from the network structure and MAC layer protocols, and finally by the simulation in the design, the load transmission capacity compared to conventional technology has been significantly improved.
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