搜索结果: 1-15 共查到“理学 O3”相关记录88条 . 查询时间(0.14 秒)
对流层O3是前体物NOx与VOCs在太阳辐射下发生光化学反应生成的二次污染物,对气候变化、生态系统、人体健康有着重要的影响。珠三角地区作为人口密度高、经济发展迅速的超大城市群,2023年来该地区的MDA8 O3仍处于增长态势,O3超标日数也在逐年增加,在秋季O3区域污染事件频发。局地O3浓度受前体物源排放、气象条件及其主导的区域传输共同影响,厘清O3的源-受体之间的关系,更全面了解排放源和区域传输...
p-CuO/n-In2 O3异质结纳米纤维的制备及气敏特性
纳米纤维 CuO/In2O3 p-n异质结 气体传感器
2019/1/22
以电纺In2O3纳米纤维为模版,通过溶剂热法构建了p-CuO/n-In2O3异质结纳米纤维.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等方法对所得材料的形貌和结构进行表征.结果表明,CuO纳米颗粒可以均匀地负载在超细In2O3纳米纤维表面;随着反应液中乙酸铜浓度的增加,负载的CuO纳米颗粒密度也逐渐增加.通过制备旁热式气敏器件对复合纳米...
Assimilation of surface NO2 and O3 observations into the SILAM chemistry transport model
surface NO2 chemistry transport model
2015/3/5
This paper describes the assimilation of trace
gas observations into the chemistry transport model SILAM
(System for Integrated modeLling of Atmospheric coMposition) using the 3D-Var method. Assimil...
Photochemical grid model implementation and application of VOC, NOx, and O3 source apportionment
model implementation application
2015/3/5
. For the purposes of developing optimal emissions
control strategies, efficient approaches are needed to identify the major sources or groups of sources that contribute to
elevated ozone (O3/...
北京城区夏季O3化学生成过程
臭氧 臭氧生成速率 臭氧生成效率 光化学箱模式
2013/11/11
选取2007年7月1日—8月31日中的21个晴空日,利用观测资料和光化学箱模式计算了北京城区测点的O3生成速率G(O3)和O3生成效率OPE.结果表明,21个晴空日中G(O3)日最高小时值分布在(18~82)×10-9h-1之间;在O3污染和非污染日G(O3)最高值的平均水平无显著差异,且与Ox浓度之间不存在一致的对应关系,表明O3化学生成过程不能全面解释地面O3浓度的累积,物理传输过程对测点O3...
Bi(Fe1-xMnx)O3的结构与磁性
多铁性 自旋玻璃体 铁磁体
2012/5/4
使用快速烧结和溶胶-凝胶方法制备了Bi(Fe1-xMnx)O3的块材陶瓷,其x能够达到0.3,因而可以得到较细的粉末. 经X射线衍射谱和拉曼光谱研究发现其结构转变取决于锰的掺杂浓度. 当x=0.05和0.1时,Bi(Fe1-xMnx)O3的结构保持斜方六面体结构;当x=0.3时,Bi(Fe1-xMnx)O3的结构变化到正方六面体结构.在x=0.05和0.1时观测到弱铁磁性,但在x=0.3时观测到强...
运用溶胶-凝胶法在Pt/Ti/SiO2/Si基片上旋涂制备了2-2型CoFe2O4/Pb(Zr0.53Ti0.47)O3磁电复合薄膜.制备的磁电薄膜结构为基片/PZT/CFO/PZT*/CFO/PZT,通过改变中间层PZT*溶胶的浓度,改变磁性层间距以及静磁耦合的大小.SEM结果表明,复合薄膜结构致密,呈现出界面清晰平整的多层结构.制备的复合薄膜具有较好的铁电与铁磁性能.实验还研究了静磁耦合对薄膜...
Theoretical Study on Impact of Single Water Molecule on OH+O3 Reaction
Ozone OH H2O Atmospheric chemistry Quantum chemical calculation
2012/4/5
Quantum chemical calculations are performed to study the reactions of OH and ozone with-out and with water to estimate whether the single water molecule can decrease the energy barrier of the OH radic...
利用1992年9月~2005年8月的HALOE资料,对我国低纬高原地区上空平流层中NOx,O3等大气痕量气体的混合比垂直变化进行了研究,并对本区域不同高度上NOx混合比与全球同纬度进行了比较,同时对NOx随时间的演变特征,NOx的变化周期及NOx与O3的相关关系进行了分析.结果表明:①NOx,O3混合比先随高度增加,到极值时又逐渐减小;在极值高度上,各个季节NOx,O3的混合比值都是夏季最高,冬季...
Results from a new linear O3 scheme with embedded heterogeneous chemistry compared with the parent full-chemistry 3-D CTM
a new linear O3 scheme embedded heterogeneous chemistry the parent full-chemistry 3-D CTM
2011/2/25
A detailed full-chemistry 3-D chemistry and transport model (CTM) is used to evaluate the current stratospheric O3 parameterisation in the European Centre for Medium-Range Weather Forecasts (ECMWF) mo...
NOx and O3 above a tropical rainforest: an analysis with a global and box model
a tropical rainforest a global and box model NOx O3
2010/11/30
A cross-platform field campaign, OP3, was conducted in the state of Sabah in Malaysian Borneo between April and July of 2008. Among the suite of observations recorded, the campaign included measuremen...
Response of tropical stratospheric O3, NO2 and NO3 to the equatorial Quasi-Biennial Oscillation and to temperature as seen from GOMOS/ENVISAT
tropical stratospheric O3, NO2 and NO3 the equatorial Quasi-Biennial Oscillation temperature GOMOS/ENVISAT
2010/9/21
Quasi-Biennial Oscillation signals can be found in the evolution of the three constituents up to at least 40 km. We found that NO3 is positively correlated with temperature up to 45 km in the region w...
The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument onboard the European Space Agency's ENVISAT satellite measures ozone, NO2, NO3, H2O, O2, and aerosols using the stellar occultati...
在A l( NO3 ) 3 溶液中利用阴极微弧放电沉积方法, 制备了T iA l合金表面的A l2O3 膜, 膜的厚度为80m。空气环境下, 在900 下进行高温氧化实验。利用扫描电镜( SEM )和X射线衍射( XRD)分析了样品在高温氧化前后的形貌和物相变化。100h高温氧化后, A l2O3 膜保持完整, 与基体有较好的结合。高温氧化前后物相均为...