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- 저자 : Qingke Sun (검색결과 2 건)
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Difference in Lake Water Area Derived from Different Resolution Imagery
Rong Xu,Zengxiang Zhang,Feifei Sun,Qingke Wen,Fang Liu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.4
In order to study the difference in lake water area derived from satellite images with different resolutions, the lake distribution maps with 30 m, 250 m and 500 m spatial resolution were derived from HJ-1A/B and MODIS data acquired in the same period. It is showed that the area estimates derived from both 250 m MODIS and 500 m MODIS have strong correlations with those derived from HJ-1A/B data for lakes with area larger than 10 km2. And 500 m MODIS data can get nearly the same estimates as 250 m MODIS data. For further analysis of the difference in lake water area, those lakes were divided into three groups according to the shape indices of lake water body, which were calculated with the results extracted from HJ-1A/B imagery. Taking HJ-1A/B lake maps as reference, it is found that the error of estimates from MODIS data increases when the lake area decreases and the shape complexity increases.
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Experimental and theoretical analysis of element mercury adsorption on Fe3O4/Ag composites
Lu Dong,Jiangkun Xie,Guangping Fan,Yaji Huang,Jun Zhou,Qingke Sun,LiangWang,Zhengwen Guan,Di Jiang,Ye Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
A novel magnetic nano-sorbent Fe3O4/Ag was synthesized and applied to capture the elemental mercury from the simulated flue gas. The morphology, components and crystal phase of the sorbents were characterized by transmission electron microscope (TEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The mercury removal performance of the sorbents was investigated through the fixed-bed tests. The results indicated that silver was successfully loaded on the surface of Fe3O4 particles, which could significantly enhance the Hg0 removal performance of the sorbents. Flue gas components, including CO2, SO2, and NO, have little impact on the Hg0 removal performance of Fe3O4/Ag sorbents, while O2 has a slightly positive effect. The Hg0 removal efficiency decreased with the increasing of temperature, Hg0 inlet concentration and gas hourly space velocity. Only one broad mercury desorption peak at approximately 210 oC could be observed during the temperature-programmed desorption (TPD) process, which indicated that mercury species existing on the surface of Fe3O4/Ag sorbents might be elemental mercury instead of oxidized mercury. Furthermore, the reusability tests showed that the Fe3O4/Ag sorbents could be efficiently regenerated and reused. Finally, the theoretical analysis based on the DFT method showed that a weak chemisorption of Hg0 on Fe3O4 sorbents changed to a strong chemisorption when silver was loaded. The results of theoretical analysis conformed to the experiments results well.
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