Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 251 for “"NO2"”.
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Fluxes of the NO-O3-NO2 triad above a spruce forest canopy in south-eastern Germany
Nitrogen monoxide (NO) and nitrogen dioxide (NO2) (denoted together as NOx) are important compounds for the regulation of the tropospheric photochemical oxidant ozone (O3). Although they account for less than one millionth of the total constituents of the atmosphere, they play an important role in …
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An experimental investigation of the conversion of NO to NO2 in a simulated gas turbine environment
Unexpectedly high concentrations of NO₂ have been noted in stack emissions from industrial gas turbines. NO₂ formation appears to occur through the so called "HO₂ mechanism II in which NO combines with HO₂ to produce NO₂ and OH. In this study, the formation of NO₂ was investigated through computer …
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Evaluation and Application of Max-DOAS Methods for Monitoring Aerosols, NO2, and SO2 in Urban and Industrial Environments
… retrievals. Retrievals of aerosol extinction, NO2, and SO2 were compared to data from lidar, sun photometer, Active-DOAS, and airborne in-situ measurements of trace gases. The MAX-DOAS retrievals performed well except under conditions of rapidly changing vertical profiles of pollution. …
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Aging Study of Silver-exchanged Mordenite and Silver-functionalized Silica Aerogel in Dry Air, Humid Air, No and No2
… aging system using dry air, humid air, 1% NO, 2% NO2 and a gas mixture consisting of all the gas streams under different aging conditions, such as aging temperature, time and water concentration, and iodine adsorption experiments on the aged adsorbents were conducted in a continuous-flow …
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Studies of Stratospheric and Tropospheric Ozone, NO2, and BrO Using UV-Visible Spectroscopy in the Arctic and at Mid-latitudes
… at PEARL, was used to validate ozone and NO2 measurements from the Atmospheric Chemistry Experiment (ACE) and Optical Spectrograph and InfraRed Imaging System (OSIRIS) satellite instruments. Ozone from all instruments agrees to within 12.0%, while NO2 measurements agree to within 33.2%. …
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Síntese e caracterização do ligante PBPA e de seu complexo [CoIII(NO2)2PBPA]ClO4 utilizado como precursor na obtenção de novos candidatos a metalofármacos
… do ligante pbpa e seu respectivo complexo [CoIII(NO2)2(pbpa)]ClO4. Os mesmos foram caracterizados pelas técnicas de espectroscopia na região do infravermelho, espectrometria de massas e espectroscopia de RMN de 1H, sendo o complexo também caracterizado por voltametria cíclica. Para o bmpa foram …
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Ground- and satellite-based observations of column nitrogen dioxide: instrument performance, column-to-surface relationships, and the role of meteorology in coastal urban environments
Nitrogen dioxide (NO2) is a criteria air pollutant that is deleterious to human health and the environment, but characterizing its distribution is challenging. This challenge arises from its abundant and heterogeneous sources, short lifetime, and the limited spatial extent of surface monitoring …
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Investigation of the Photoenhanced Reduction of Nitrogen Dioxide (NO2) on Organic Films and Above Soils as the Missing Source of Daytime Tropospheric Nitrous Acid (HONO)
… radiation on the uptake kinetics of gas-phase NO2 on various phenolic-containing organic films using a wetted-wall flow tube (WWFT) photoreactor. Experimental methods are discussed in detail. A time-dependent model for non-equilibrium conditions incorporating both the chemistry and diffusion …
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Prediction of concentrations of reactive nitrogen species in aqueous solutions and cells
… the sum of ONOO- and ONOOH), nitrogen dioxide (NO2), and nitrous anhydride (N20 3) were calculated to have concentrations in the nM, pM, and fM ranges, respectively. The concentrations of NO2 and N20 3 were predicted to decrease markedly with increases in glutathione (GSH) levels, due to the …
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Chronic Respiratory Disease Symptom Effects of Long-Term Cumulative Exposure to Passive Tobacco Smoke and to Ambient Levels of TSP, Oxidants, SO2, and NO2 in Southern California
… to the ambient levels of TSP, oxidants, SO2 and NO2 in photochemical air pollution, symptoms were ascertained using NHLBI questions on 8,572 Southern California Seventh-day Adventist, nonsmokers, 25 years and older, who lived eleven years or longer in their 1977 residential area. Tobacco smoke, …
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The association between ambient air pollution and cardiorespiratory health outcomes of adults residing in informal settlements of the Western Cape in a 12 month period
… Cape to determine the association between annual NO2 and PM2.5 air pollution exposure and cardiorespiratory outcomes in adults. Methods: A questionnaire was administered to 506 participants who were guardians of learners in a primary study, to collect information on cardio-respiratory symptoms and …
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Metal organic frameworks as sorbents for volatile organic compounds
… thin films of UiO-66-R, where R = -H, -NH2, and-NO2, were fabricated onto Au-coated Si wafers and Au-coated quartz crystal microbalance surfaces using a vapor-assisted conversion method. The films were then characterized by scanning electron microscopy, powder x-ray diffraction, x-ray …
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Doping of Metal Organic Framework (UiO) and for N02 adsorption at ambient Conditions
… air purification technologies. Nitrogen dioxide NO2 is one of the toxic gases in the atmosphere that is corrosive; it causes severe damage to materials, even at low concentrations. Research on the adsorption of this gas at atmospheric pressure and ambient temperatures is uncommon because of …
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IMPACT OF INDOOR AIR POLLUTION ON INFLAMMATORY BIOMARKERS AND CARDIAC AUTONOMIC CONTROL IN HEALTHY SUBJECTS AND PATIENTS WITH CONGESTIVE HEART FAILURE (APICE STUDY)
… particulate matter (PM2.5), nitrogen dioxide (NO2) and volatile organic compounds (VOCs) were monitored using a portable detector for 7 days. Together, a 7-day monitoring was performed through a wireless patch that continuously recorded electrocardiogram, respiratory activity and actigraphy. …
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Unraveling the fingerprints of NOx using stable isotopes: Implications for NOx source partitioning and oxidation chemistry
… through its three major pathways thatinclude(1)NO2 +•OH→HNO3, (2)N2O5 +surface→2HNO3, and(3)NO3+ R→•R. This model indicated that these pathways result in distinctive δ18O-δ15N relationships that tend to match reported literature values. Finally, in order to evaluate the influences of NOx emission …
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