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Development of High Spectral Resolution Lidar System for Measuring Aerosol and Cloud
Ming Zhao,Chen-Bo Xie,Zhiqing Zhong,Bang-Xin Wang,Zhenzhu Wang,Pang-Da Dai,Zhen Shang,Min Tan,Dong Liu,Yingjian Wang 한국광학회 2015 Current Optics and Photonics Vol.19 No.6
A high spectral resolution lidar (HSRL) system based on injection-seeded Nd:YAG laser and iodineabsorption filter has been developed for the quantitative measurement of aerosol and cloud. The laserfrequency is stabilized at 80 MHz by a frequency locking system and the absorption line of iodine cellis selected at the 1111 line with 2 GHz width. The observations show that the HSRL can provide verticalprofiles of particle extinction coefficient, backscattering coefficient and lidar ratio for cloud and aerosolup to 12 km altitude, simultaneously. For the measured cases, the lidar ratios are 10~20 sr for cloud,28~37 sr for dust, and 58~70 sr for urban pollution aerosol. It reveals the potential of HSRL to distinguishthe type of aerosol and cloud. Time series measurements are given and demonstrate that the HSRL hasability to continuously observe the aerosol and cloud for day and night
Rajalapati Durga Gayathri,Thavamani Gokulnath,박호열,Zhiqing Xie,진성호,한승철,이재욱 한국고분자학회 2022 Macromolecular Research Vol.30 No.10
Although the small molecule hole-transporting materials (HTMs) pop up with an efficiency of over 25%, long-term stability still needs to be improved for the commercialization of perovskite solar cells. In the current work, we designed two fluorine-dithiophene (FDT)-based small molecule HTMs (F2DT and FDT-DMP), and comparative studies of HTMs were performed for stable donor-acceptor-donor (D-A-D) perovskite solar cells. Notably, the introduction of fluorene-terminated groups on FDT resulted in fine-tuned energy levels and better thermal stability with a high glass transition temperature (T g~157℃), which follow-on enhanced perovskite device performance of F2DT. The hydrophobic nature of the F2DT compound truly favored the formation of uniform and dense perovskite films that further improved the stability of the devices. The comparison studies revealed that F2DT displayed higher power conversion efficiency (PCE) of 18% than FDT-DMP (PCE of 12.3%). The resultant F2DT device displays better stability than the device with FDT-DMP, maintaining almost 80% of its initial performance for more than 300 h.
12-year LIDAR Observations of Tropospheric Aerosol over Hefei (31.9°N, 117.2°E), China
Decheng Wu,Jun Zhou,Dong Liu,Zhenzhu Wang,Zhiqing Zhong,Chen-Bo Xie,Fudi Qi,Aiyuan Fan,Yingjian Wang 한국광학회 2011 Current Optics and Photonics Vol.15 No.1
12-year LIDAR observations of tropospheric aerosol vertical distribution using a Mie scattering LIDAR in Hefei (31.9°N, 117.2°E) from 1998 to 2009 are presented and analyzed in this paper. Characters of temporal variation and vertical distribution of tropospheric aerosol over Hefei are summarized from the LIDAR measurements. The impacts of natural source and human activities on the aerosol vertical distribution over Hefei could be seen clearly. Dust particles from the north in spring could affect the aerosol distributions below about 12 km over Hefei, and aerosol scale height in April reaches 2.29±0.68 km. Both LIDAR measurements and surface visibility imply that aerosols in the lower troposphere have been increasing since about 2005.