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Video transmission is a key technology of security monitoring systems used in underground constructions. The video transmission based on carrier wave is an emerging and promising technology compared with the widely used technologies using coaxial cable, twisted-pair wire, optical fiber, and wireless wave. The study presents a novel design scheme of image transmission system based on carrier wave....
Because of the toxicity property of chromium in the water, it is important for the water environment to monitor the trace chromium with a kind of simple and sensitive method. Spectrophotometry of CAS and CTMAB is adopted to determine chromium in the Fu-yang river. The results indicates that the detected limit of this method is 0.0005 ug/mL, the mark-on recovery ranged from 87.7% to 97.0% and relative...
In view of the uncertainty problem of pollutants diffusing in the atmosphere of Handan city, we monitor and put forward a new conception about air ground pollution belt, and get two-dimensional finite difference equation of air pollution. Meanwhile dispersion coefficient and wind speed are considered as grey parameters. One grey numerical quality model of air pollution is built according to grey theory...
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