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RISS 인기검색어
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- 저자 : Qiwen Mei (검색결과 4 건)
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Correlation Analysis of Pollutant Factors Influencing the Sulfite/UV-L Advanced Reduction Process
Mei Qiwen,Ki Hoon Kim,한인섭 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.2
In this study, factors that influenced the process of trichloroethylene (TCE) degradation using the sulfite/UV-L Advanced Reduction Process (ARP) were analyzed, as well as the interrelation of these factors, the correlation between factors, and the trichloroethylene (TCE) degradation efficiency. Four factors were evaluated: pH, reductive reagent (sulfite) concentration, UV254 intensity, and trichloroethylene (TCE) concentration. The efficiency of trichloroethylene (TCE) degradation by the sulfite/UV-L Advanced Reduction Process (ARP) increased as the initial pH increased. Considering economy, pH 10 was decided as the optimum condition. The trichloroethylene (TCE) degradation efficiency by sulfite/UV-L Advanced Reduction Process (ARP) also increased with increasing sulfite concentration. According to the experimental results, the optimum sulfite concentration to treat 10 mM of the trichloroethylene (TCE) was 10 mg/L. The degradation efficiency of the trichloroethylene (TCE) also increased as the intensity of UV254 radiation was increased. Higher initial concentrations of trichloroethylene (TCE) resulted in decreased degradation efficiency. All the factors also been analyzed using multiple regression carried out by the program SPSS (ver. 22). The pH seemed to have a high correlation with looking pearson coefficient. It is most important to consider the influence of pH when using sulfite/UVL Advanced Reduction Process (ARP). The initial concentration of trichloroethylene (TCE) seemed to have the most relevance by looking pearson coefficient, followed by pH and UV254. The regression model seemed to be appropriate, having a value (0.000), which was much lower than the significance level (0.05), and the correlation coefficient (R2) of 0.816 describes the power elimination rate of trichloroethylene (TCE).
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Xinyi Ying,김기성,한인섭,Jiayi Sheng,Qiwen Mei,김양욱 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
Spent activated carbon is a common by-product of pollution treatment with granular activated carbon (GAC) adsorption and therefore spent activated carbon treatment for reuse is critical to maximize cost-effectiveness and sustainability. Superheated steam regeneration is a novel treatment technology that uses water vapor and is more energy- and cost-efficient than other thermal regeneration methods. This work has value in that two modes of operation are compared in a small-scale process, whose experiment is well designed to reflect its large-scale process. Our study evaluated the effects of superheated steam regeneration on phenol-saturated activated carbon using a rapid small-scale column test (RSSCT) and evaluated this approach with the conventional chemical regeneration method. Our findings indicated that superheated steam regeneration achieved optimal performance at 500oC for 60 min, whereas chemical regeneration performance was optimal using 4% NaOH coupled with a low flow rate. Based on these observations, cyclic adsorption/regeneration tests were conducted six times. Additionally, differences on the carbon surface after regeneration were explored via scanning electron microscopy (SEM). The results indicated that superheated steam was more efficient and rendered cleaner carbon surfaces.
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Robust anti-icing performance of silicon wafer with hollow micro-/nano-structured ZnO
Lei Wang,Chao Teng,Jing Liu,왕만상,Liu Guicheng,김지영,Qiwen Mei,이중기,Jingxia Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
A novel silicon-based robust anti-icing surface with hollow micro-/nano-structured ZnO (HMN) is investigated. The droplet could not freeze in 30 min under low temperature of −15 °C, while that performance fails on the nano-structured and smooth surfaces. The cooling period of temperature fields on liquid droplet and the base are observed, which indicates that the air layer has a significant effect on the performance of the anti-icing surface. The results prove that the hollow micro-structure layer provides much more air than the nano-structured layer and induces the maximum thermal resistance, leading to its icephobic property. In this finding, HMN provides large thermal resistance between the base and liquid droplet and easily realizes long lasting anti-icing performance under lower temperature. This new concept is expected to be used in the fields of anti-icing, superhydrophobicity, insulation, thermal resistance, etc.
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Yuhu Zhang,Pei Xie,Xiao Pu,Fuqiang Xia,Jialin An,Peng Wang,Qiwen Mei 한국기상학회 2019 Asia-Pacific Journal of Atmospheric Sciences Vol.55 No.2
Analyses of drought and precipitation require long-term historical data and reasonable drought index to ensure reliable monitoring and prediction, especially for the Xinjiang Uygur Autonomous Region, where is sensitive and vulnerable to drought disasters. Drought characteristic was expressed using the observational precipitation data and calculated precipitation threshold at 105 meteorological stations from 1979 to 2014. The results showed that the variation of drought and precipitation was not spatially uniform. Analysis in sub-areas was conducted based on mutli-statistical methods. The historical drought and precipitation situation in Xinjiang is better characterized by three clusters. Cluster 1 is the driest, cluster 2 has a clear increasing trend of precipitation, while cluster 3 is the wettest with the mean annual precipitation approximates to 300 mm. In addition, the precipitation concentration and distribution is becoming uniform, there is a faster rate of increasing precipitation in coolseason rather than in warm-season. The results provide critical support for the drought disasters management and mitigation, it also provide a base for in-depth investigation on the possible mechanisms of regional drought.
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