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| 1 | Characteristics of atmospheric single particles during haze periods in a typical urban area of Beijing:A case study in October,2014显示文摘To investigate the composition and possible sources of particles, especially during heavy haze pollution, a single particle aerosol mass spectrometer(SPAMS) was deployed to measure the changes of single particle species and sizes during October of 2014, in Beijing. A total of 2,871,431 particles with both positive and negative spectra were collected and characterized in combination with the adaptive resonance theory neural network algorithm(ART-2a). Eight types of particles were classified: dust particles(dust, 8.1%), elemental carbon(EC, 29.0%), organic carbon(OC, 18.0%), EC and OC combined particles(ECOC, 9.5%),Na-K containing particles(Na K, 7.9%), K-containing particles(K, 21.8%), organic nitrogen and potassium containing particles(KCN, 2.3%), and metal-containing particles(metal,3.6%). Three haze pollution events(P1, P2, P3) and one clean period(clean) were analyzed,based on the mass and number concentration of PM_(2.5)and the back trajectory results from the hybrid single particle Lagrangian integrated trajectory model(Hysplit-4 model). Results showed that EC, OC and K were the major components of single particles during the three haze pollution periods, which showed clearly increased ratios compared with those in the clean period. Results from the mixing state of secondary species of different types of particles showed that sulfate and nitrate were more readily mixed with carbon-containing particles during haze pollution episodes than in clean periods. | Lang Liu Yanli Wang Shiyong Du Wenjie Zhang Lujian Hou Sverre Vedal Bin Han Wen Yang Mindong Chen Zhipeng Bai | 2016 | Journal of Environmental Sciences2016，28，2： | 19 |
| 2 | Gravimetric analysis for PM_(2.5) mass concentration based on year-round monitoring at an urban site in Beijing显示文摘Daily PM_(2.5)(particulate matter with an aerodynamic diameter of below 2.5 μm) mass concentrations were measured by gravimetric analysis in Chinese Research Academy of Environmental Sciences(CRAES), in the northern part of the Beijing urban area, from December 2013 to April 2015. Two pairs of Teflon(T1/T2) and Quartz(Q1/Q2) samples were obtained, for a total number of 1352 valid filters. Results showed elevated pollution in Beijing,with an annual mean PM_(2.5)mass concentration of 102 μg/m^3. According to the calculated PM_(2.5)mass concentration, 50% of our sampling days were acceptable(PM_(2.5)< 75 μg/m^3), 30% had slight/medium pollution(75–150 μg/m^3), and 7% had severe pollution(> 250 μg/m^3). Sampling interruption occurred frequently for the Teflon filter group(75%) in severe pollution periods,resulting in important data being missing. Further analysis showed that high PM_(2.5)combined with high relative humidity(RH) gave rise to the interruptions. The seasonal variation of PM_(2.5)was presented, with higher monthly average mass concentrations in winter(peak value in February, 422 μg/m^3), and lower in summer(7 μg/m^3 in June). From May to August, the typical summer period, least severe pollution events were observed, with high precipitation levels accelerating the process of wet deposition to remove PM_(2.5). The case of February presented the most serious pollution, with monthly averaged PM_(2.5)of 181 μg/m^3 and 32% of days with severe pollution. The abundance of PM_(2.5)in winter could be related to increased coal consumption for heating needs. | Yanli Wang Wen Yang Bin Han Wenjie Zhang Mindong Chen Zhipeng Bai | 2016 | Journal of Environmental Sciences2016，28，2： | 5 |
| 3 | An ozone generator of miniaturization and modularization with the narrow discharge gap显示文摘 | Zhang Zhitao Bai Xiyao Bai Mindong | 2003 | Plasma Chemistry and Plasma Processing2003，23，3： | 1 |
| 4 | Plasma synthesis of ammonia with a microgap dielectric barrier discharge at ambient pressure显示文摘 | BAI Mindong ZHANG Zhitao BAI Xiyao | 2003 | IEEE Transactions on Plasma Science2003，31，6： | 1 |
| 5 | Treatment of red tide in ocean using non-thermal plasma based advanced oxidation technology显示文摘 | Bai Mindong Bai Xiyao Zhang Zhitao | 2005 | Plasma Chemistry and Plasma Processing2005，25，5： | 1 |
| 6 | Simultaneous desulfurization and denitrification of flue gas by·OH radicals produced from O2+ and water vapor in a duct显示文摘 | Bai Mindi Zhang Zhitao Bai Mindong | 2012 | Environmental Science & Technology2012，46，10： | 1 |
| 7 | Evaluation of the ecotoxicity and biological efficacy of ship\'s ballast water treatment based on hydroxyl radicals technique显示文摘 | Zhang Nahui Zhang Zhitao Bai Mindong | 2012 | Marine Pollution Bulletin2012，64，12： | 1 |
| 8 | An ozone generator of miniaturization and modularization with the narrow discharge gap显示文摘 | Zhitao Zhang Xiyao Bai Mindong Bai | 2003 | Plasma Chemistry and Plasma Processing2003，23，3： | 1 |
| 9 | Removal of SO2 from simulated flue gases using non-thermal plasma-based mierogap discharge 显示文摘 | Zhang Zhitao Bai Mindong Bai Mindi | 2006 | Journal of the Air and Waste Management Association2006，56，6： | 1 |
| 10 | Simultaneous desulfurizaton and denitrihcation of flue gas by ,OH radicals produced from O2 and water vapor in a Duct显示文摘 | Mindi Bai Zhitao Zhang Mindong Bai | 2012 | Environ Sci Tecchnol2012，46，10： | 1 |
| 11 | Treatment of Microalgae in Ballast Water Using Hydroxyl Radical in Accordance with the D-2 Ballast Water Discharge Standard显示文摘The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships. | MENG Xiangying CHEN Cao BAI Mindong SUN Jian MENG Fanpeng | 2014 | 高电压技术2014，40，1： | 0 |
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