搜索结果: 1-15 共查到“理学 NO2”相关记录109条 . 查询时间(0.073 秒)
中国科学技术大学地球和空间科学学院、火灾科学国家重点实验室双聘教授李锐及其合作者利用现代卫星遥感、数值模型及交通大数据等研究手段，量化揭示了2020年新冠疫情期间人类活动和气象条件变化对大气污染物二氧化氮（NO2）浓度分别的影响，成果发表于国际著名学术期刊National Science Review（影响因子16.96）上。
光解速率是体现我国大气复合污染特征的关键参数，是不同污染物相互作用的枢纽。NO2的光解速率是对流层臭氧形成关键影响因子之一。然而光解速率与气溶胶相互作用及光解速率对臭氧和二次气溶胶生成贡献的问题仍缺乏深入研究。
近日，安光所高晓明研究员团队在光声光谱同时测量大气气溶胶和二氧化氮（NO2）方面取得新进展，相关研究成果以“用于同时测量气溶胶吸收和NO2浓度的基于443nm激光二极管的差分光声光谱仪”为题在线发表于光声光谱领域知名期刊Photoacoustics上。大气气溶胶、NO2是大气主要污染物之一，气溶胶吸收的在线测量仍然是难题之一，光声光谱因其不受光散射影响、探测器不受光波段限制等特点，在测量气溶胶、痕...
采用CCSD（T）/aug-cc-pVTZ//M06-2X/cc-pVDZ方法研究了RCHOO（R=H，CH3）+NO2反应的微观机理，并讨论了甲基取代对反应活性的影响.结果表明，该反应存在加成-分解、氧化-氢转移和直接抽氢3类反应机理，其中氧化-氢转移反应的主要产物为RCO+HNO3，表观活化能仅为40.51 kJ/mol，且释放出235.04 kJ/mol的能量，是反应的优势通道；而生成RCH...
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...
Assimilation of OMI NO2 retrievals into the limited-area chemistry-transport model DEHM (V2009.0) with a 3-D OI algorithm
OMI NO2 retrievals limited-area chemistry-transport model DEHM 3-D OI algorithm
2014/12/17
Data assimilation is the process of combining real-world observations with a modelled geophysical field. The increasing abundance of satellite retrievals of atmospheric trace gases makes chemical data...
Evaluation of the United States National Air Quality Forecast Capability experimental real-time predictions in 2010 using Air Quality System ozone and NO2 measurements
the United States National Air Quality Forecast Capability experimental real-time predictions Air Quality System ozone NO2 measurements
2014/12/12
The National Air Quality Forecast Capability (NAQFC) project provides the US with operational and experimental real-time ozone predictions using two different versions of the three-dimensional Communi...
探讨乙酰化修饰对绿茶多糖清除自由基、NO-2活性的影响,设计正交实验研究乙酰化修饰的最佳反应条件,在此条件下制取乙酰化绿茶多糖,对其修饰前后超氧阴离子(O-2·)自由基、羟自由基(·OH)和NO-2体外清除活性进行比较,并进行不同取代度的乙酰化茶多糖进行自由基及NO-2的清除作用实验,考察清除活性与取代度之间的关系。实验所得到乙酰化修饰最优条件为:茶多糖质量(g)与乙酸酐体积(m L)比为1∶40...
采用丝网印刷技术制备了以La0.9Sr0.1Ga0.8Mg0.2O3W22;δ(LSGM)为固体电解质、NiO为敏感电极(SE)材料的电流型NO2传感器。用X 射线衍射仪和扫描电镜对该传感器进行了理化分析；通过测量其在不同温度和不同NO2浓度气氛中的I-V曲线和时间响应曲线对传感器的电流输出信号和NO2浓度的关系以及时间响应特性进行了研究。结果显示：在400~650℃测试温度范围内，传感器响...
高岭石是典型的1 ∶ 1型层状结构的硅铝酸盐,研究其非均相反应对于了解粘土类矿物的非均相反应具有重要的意义.因此,试验以原位漫反射红外傅里叶变换光谱(DRIFTS)为研究手段,对NO2在高岭石表面的非均相反应进行了系统的研究.结果表明,NO2在高岭石表面发生歧化反应生成NO-3和NO-2.相对湿度对非均相反应具有重要影响,有水汽存在时会增加反应的持续能力,但相对湿度的增加会使摄取系数降低.在干态和...
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...
Evaluation of a regional air quality forecast model for tropospheric NO2 columns using the OMI/Aura satellite tropospheric NO2 product
a regional air quality forecast model tropospheric NO2 columns the OMI/Aura satellite tropospheric NO2 product
2010/9/21
Results from a regional air quality forecast model, AIRPACT-3, are compared to OMI tropospheric NO2 integrated column densities for an 18 month period over the Pacific Northwest. AIRPACT column densit...
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...
Photolysis frequencies for NO2 are modeled for the conditions in urban streets, which are taken into account as canyons with variable height and width. The effect of a street canyon is presented with ...