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 15 of 15 for “"atmospheric oxidation"”.
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Hydrolysis and Atmospheric Oxidation Reactions of Perfluorinated Carboxylic Acid Precursors
… with regards to their environmental fate upon atmospheric oxidation. Using a smog chamber, the kinetics and degradation mechanisms of N-ethylperfluorobutyramide (EtFBA) were elucidated. The lifetime of EtFBA to oxidation by OH was found to be approximately 4 days. Using offline sampling, PFAMs …
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Illuminating reaction pathways in low-temperature combustion, pyrolysis & atmospheric oxidation
… from various fields to advance knowledge about atmospheric and combustion chemistry, and developing computational tools to model pyrolysis for isotopic analysis. Having a solid foundation for reaction kinetics is necessary to get accurate kinetic rates. The first chapter corrects a longstanding …
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Mechanistic, sensitivity, and uncertainty studies of the atmospheric oxidation of dimethylsulfide
… DMS) make it an integral component in the atmospheric sulfur cycle. DMS is rapidly oxidized in the atmosphere by a complex gas-phase mechanism involving many species and reactions. The resulting oxidized sulfur-bearing products are hygroscopic and interact with aerosols through condensation …
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Development & Testing of Novel Atmospheric Chemistry Technologies
<p>Atmospheric aerosols play an important role in global atmospheric chemistry and climate and have a detrimental impact on human health. Advancements in measurement technologies allow for better monitoring of atmospheric composition and dynamics, creating better predictive models and understanding …
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Hydrogen Abstraction by the Nighttime Atmospheric Detergent NO3·: Fundamental Principles
… identified as early as the 1881, but its role in atmospheric oxidation has only been identified within recent decades. Due to its high one-electron reduction potential and its reactivity toward a diverse set of substrates, it dominates nighttime atmospheric oxidation and has since been the subject …
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Tetrahydrobiopterin Metabolism in Mental Retardation
… noted. The stability of pterins under different oxidation conditions was investigated. Acid- and alkaline-oxidation of reduced biopterins produced almost stoichiometric conversion to biopterin or pterin and was used to quantitate dihydrobiopterin and tetrahydrobiopterin levels. atmospheric …
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MEASUREMENTS OF ATMOSPHERIC RADICALS IN AMBIENT AND INDOOR ENVIRONMENTS: OUTDOOR-INDOOR RELATIONSHIPS, INDOOR FORMATION MECHANISMS, AND INSTRUMENTAL ANALYSIS
… (HO2), and peroxy (RO2) radicals are key to atmospheric oxidation, critically altering the chemistry of the air we breathe. Radical reactions initiate oxidation of volatile organic compounds (VOCs), which in the presence of nitrogen oxides (NOx) can form ozone and secondary organic aerosols …
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Unraveling the fingerprints of NOx using stable isotopes: Implications for NOx source partitioning and oxidation chemistry
… sources as well as for understanding the atmospheric oxidation pathways responsible for its removal if various NOx sources and sink processes exhibit characteristic isotopic compositions (“fingerprints”). However, this requires (1) an accurate and complete inventory of δ15N(NOx) values from …
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An investigation into the tropospheric chemistry of acidic aerosols and ammonia in the laboratory
… system to probe the interactions between atmospherically relevant aerosols with trace gases. This apparatus was used to obtain simultaneous optical and size distribution measurements using FTIR and SMPS measurements respectively as a function of relative humidity and aerosol chemical …
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Measurement and characterization of low volatility organic compounds in the atmosphere
… control tiers. Laboratory studies examining the atmospheric oxidation of common biogenic and anthropogenic SOA precursors in environmental "smog" chambers show different production and evolution profiles of IVOCs. The comparison of IVOCs measured by the TD-EIMS with other analytical techniques …
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Characterization of Internal Formaldehyde Production within The Pandora Spectrometer Instrument
Formaldehyde (HCHO), plays an important role in atmospheric chemistry and is an indicator of atmospheric oxidation capacity and surface ozone photo chemistry. The Pandora Spectrometer Instruments are deployed within the NASA/ESA sponsored Pandonia Global Network designed for satellite validation of …
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Assessment and modelling of chromium release in minerals processing waste deposits
… reviewed and, as a side aspect, the long-term atmospheric oxidation of Cr(III) to Cr(VI) has been positively identified by experimental work with a third chromium-containing waste material. The two test materials have been subjected to intensive characterisation in terms of column and batch …
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Understanding the formation of secondary organic aerosol and the fates of organic nitrates formed from monoterpene oxidation
… volatile organic compounds (VOC), and their oxidation is considered to contribute to global SOA budget substantially. In the presence of NOx, oxidation of monoterpenes also produces organic nitrates. The formation of organic nitrates sequesters NOx from the atmosphere, directly suppressing …
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Predictive kinetic modeling of low-temperature hydrocarbon oxidation
Low temperature oxidation in the gas and condensed phases has been the subject of experimental investigations for many decades owing to applications in many areas of practical significance like thermal stability, combustion, atmospheric chemistry and industrial syntheses. Owing to several practical …
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Atmospheric Chemistry of Volatile Organic Compounds: Oxidation Products, Mechanisms and Secondary Organic Aerosol Formation
… a piece in understanding the complex puzzle of atmospheric aerosol formation. Secondary organic aerosol (SOA) formed by the oxidation of volatile organic compounds (VOC) in the atmosphere is a key component of air pollution with a strong negative impact on human health and influence on climate, …