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Marketing with Shallow and Prudent Influencers
In: NET Institute Working Paper No. 20-06
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Working paper
Strategic Conformity in Affiliate Marketing
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The Role of Social Learning in Influencer Marketing
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Green synthesis of nZVI-modified biochar significantly enhanced the removal of Cr(VI) from aqueous solution
In: Environmental science and pollution research: ESPR, Band 31, Heft 23, S. 33993-34009
ISSN: 1614-7499
Carbon Ecology Supply, Demand, Flow and Compensation of Land Use Transition in Xinjiang, China
In: STOTEN-D-22-09766
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Preparation of imprinted bacterial cellulose aerogel with intelligent modulation of thermal response stimulation for selective adsorption of Gd(III) from wastewater
In: Environmental science and pollution research: ESPR, Band 30, Heft 60, S. 125806-125815
ISSN: 1614-7499
VOC species controlling O3 formation in ambient air and their sources in Kaifeng, China
In: Environmental science and pollution research: ESPR, Band 30, Heft 30, S. 75439-75453
ISSN: 1614-7499
Abstract
The concentration of ozone has been in a rising crescendo in the last decade while the fine particles (PM2.5) is gradually decreasing but still at a high level in central China. Volatile organic compounds (VOCs) are the vital precursors of ozone and PM2.5. A total of 101 VOC species were measured in four seasons at five sites from 2019 to 2021 in Kaifeng. VOC sources and geographic origin of sources were identified by the positive matrix factorization (PMF) model and the hybrid single-particle Lagrangian integrated trajectory transport model. The source-specific OH loss rates (LOH) and ozone formation potential (OFP) were calculated to estimate the effects of each VOC source. The average mixing ratios of total VOCs (TVOC) were 43.15 parts per billion (ppb), of which the alkanes, alkenes, aromatics, halocarbons, and oxygenated VOCs respectively accounted for 49%, 12%, 11%, 14%, and 14%. Although the mixing ratios of alkenes were comparatively low, they played a dominant role in the LOH and OFP, especially ethene (0.55 s−1, 7%; 27.11 μg/m3, 10%) and 1,3-butadiene (0.74 s−1, 10%; 12.52 μg/m3, 5%). The vehicle-related source which emitted considerable alkenes ranked as the foremost contributing factor (21%). Biomass burning was probably influenced by other cities in the western and southern Henan and other provinces, Shandong and Hebei.
Characteristics, Effects and Sources of Ambient Volatile Organic Compounds in Kaifeng, China
In: STOTEN-D-22-19582
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