Pollution Characteristics and Key Reactive Species of Volatile Organic Compounds in Beijing-Tianjin-Hebei Area, China

Golf Abstract Volatile organic compounds (VOCs) are important precursors in the formation of ground-level ozone.In this study, the hourly mixing ratios of 61 ambient VOC species were monitored from 2018 till 2019 in 10 cities in the Beijing-Tianjin-Hebei (BTH) area of China, and the VOC distributions, speciation and photochemistry were also examine

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Anti-sound and Acoustical Cloaks

The principles by which the acoustics can be mimicked in order to reduce or cancel the vibrational field are based on anti-sound concept which can Fuse Fast Blow be materialized by acoustic cloaks.Geometric transformations open an elegant way towards the unconstrained control of sound through acoustic metamaterials.Acoustic cloaks can be achieved t

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