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中国对流层二氧化硫光化学氧化过程的数值研究 被引量:11
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作者 刘红年 蒋维楣 +1 位作者 汤剑平 李昕 《环境科学学报》 CAS CSCD 北大核心 2001年第3期358-363,共6页
利用一个三维非静力区域大气化学输送模式与中尺度气象模式MM5相连接构成一个数值模拟系统 ,模拟了中国地区对流层臭氧与其前体物的分布以及二氧化硫转化为硫酸盐的过程 ,模式包括地面源排放、大气输送和扩散、干沉积、气相化学反应和... 利用一个三维非静力区域大气化学输送模式与中尺度气象模式MM5相连接构成一个数值模拟系统 ,模拟了中国地区对流层臭氧与其前体物的分布以及二氧化硫转化为硫酸盐的过程 ,模式包括地面源排放、大气输送和扩散、干沉积、气相化学反应和云雨过程 .结果表明 :日间 ,O3 浓度主要由NOx 和NMHC的源排放和光化学反应过程支配 ,大气辐射是光化学反应强弱的决定因子 ,其强度可使SO2 、O3 和SO4 2 -的生成浓度呈现不同的日变化和季节变化 ,结果表明高浓度的O3 对二氧化硫转化为硫酸盐的化学过程有很大的促进作用 ,然而 ,这种作用受NMHC浓度的影响很大 ,较高浓度的NMHC使O3 浓度上升 ,但同时增加了对OH等自由基的消耗 ,使SO2 的转化率降低 . 展开更多
关键词 大气化学输送 大气化学 光化学氧化过程 中国地区 大气污染
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Photochemical Degradation of the Ciprofloxacin Antibiotic and Its Microbiological Validation
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作者 Fernando Hernaindez Antonio Rivera +2 位作者 Angeles Ojeda Teresa Zayas Lilia Cedillo 《Journal of Environmental Science and Engineering(A)》 2012年第4期448-453,共6页
In this research, it used advanced oxidation processes for the recovery, detoxification and mineralization of wastewater mainly contaminated by antibiotics (ciprofloxacin). These processes can be used alone or in co... In this research, it used advanced oxidation processes for the recovery, detoxification and mineralization of wastewater mainly contaminated by antibiotics (ciprofloxacin). These processes can be used alone or in combination with each other or by complementing traditional methods, even allowing the disinfection of bacterial and viral inactivation. With the use of experimental systems UV/H202/O3, UV/H202, it can achieve total mineralization of the compound. Ciprofloxacin solutions used at 50, 100, 200, 300, 400 and 500 ppm, degraded to 100% of antibiotics and by a microbiological method show that the loss of biological activity is inversely proportional to the time of irradiation. 展开更多
关键词 Emerging contaminants advanced oxidation processes antibiotics photodegradation.
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The Role of the Dipole Interaction of Molecules with Charged Particles in the Polar Stratosphere
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作者 Yury Belikov Sergey Nikolayshvili 《Journal of Earth Science and Engineering》 2016年第3期115-149,共35页
Our analysis of published results of experiments in the Polar Regions substantiates and further develops our new approach to the photochemical processes in the polar stratosphere involving the charged particles. The d... Our analysis of published results of experiments in the Polar Regions substantiates and further develops our new approach to the photochemical processes in the polar stratosphere involving the charged particles. The dipole interaction of molecules with charged particles, primarily with ions, leads to the adhesion and disintegration of a number of molecules including ozone. Molecules acquire additional energy on the surface of the charged particles, enabling reactions that are not possible in space. Galactic cosmic rays are the main source of ions in the polar stratosphere, their equilibrium concentration at altitudes of 15 to 25 km can reach up ~ (1-5) ~ 103 ions/cm3. Estimations show that if the ozone destruction in the regime of"collision" with ions then the lifetime of ozone will vary from 10 days to 2 months. We suppose that alongside with the chlorine mechanism of ozone destruction there is a mechanism of ozone decay on a charged particle which can act also at those latitudes and altitudes where chlorine oxide CIO is absent, as well as in the night conditions. Here, we demonstrated the close connection of photochemical processes with the dynamic, electrical and condensational phenomena in the stratosphere, in particular, with the accumulation of unipolar charged particles on the upper and lower boundaries of the polar stratospheric clouds and aerosol layers as a result of the activity of the global electric circuit. 展开更多
关键词 Polar stratosphere OZONE charged particles dipole interaction global electric circuit photochemistry.
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