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 19 of 19 for “"Ozone production"”.
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Measurements and analysis of ozone production in Houston and Los Angeles
Ozone is a respiratory irritant that affects all groups of people, but can be of significant concern to young children, those with respiratory illnesses such as asthma, and the elderly. Repeated exposure can cause permanent lung damage. An estimated 123 million people in the Unites States live in …
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Mitigation of ozone production by negative corona using electrode wire heating
Ozone generation is a problem associated with indoor air cleaners that utilize a corona to ionize particles. This experimentation utilized a negative corona and investigated the effect that external electrode wire heating had on the ozone production rate. Results showed that the ozone generation …
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Flugzeugmessungen von NO, NOy, CO und O3 in der freien Troposphäre zwischen 60 °N und 60 °S - Nord-Süd-Kontrast und Verteilung in den Tropen
… POLINAT 2. Based on selected case studies net ozone production was calculated from O3, NO, CO and H2O measurements. For these estimates the chemical reactions with hydrocarbons were neglected and model results were used for the ozone photolysis frequency and the OH concentrations. The results …
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Examining Transportation of Natural Gas Exploration Emissions in the High Plains Region Using the Wrf-Chem Model
Surface ozone (O3) production relies on chemical reactions between nitrogen oxides (NOX) and volatile organic compounds (VOCs). Natural gas production is responsible for the production of both of these chemicals: heavy machinery in extracting processes generates nitrogen oxides and equipment leaks …
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Micro-physical modeling of aircraft exhaust plumes and condensation Trails
… partitioning, and thus, an over-prediction of ozone production. To account for non-linear plume processes, a Lagrangian aircraft plume model has been implemented. It includes a unified tropospheric-stratospheric chemical mechanism that incorporates heterogeneous chemistry. Micro-physical …
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Summertime ozone pollution in China: Observations and Simulations
Ground-level ozone is a secondary atmospheric pollutant that damages human and vegetation health. The chemical production of ground-level ozone involves the photochemical reactions between nitrogen oxides (NOX = NO + NO2) and volatile organic compounds (VOCs). China is experiencing high levels of …
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Modellierung des dynamischen Verhaltens von Oberflächen-Barrierenentladungen und der Ozonerzeugung
… foils and for plasma-chemical applications like ozone production. This work has the aim to model the dynamics of surface discharges and to simulate the spatial and temporal resolved discharge development in oxygen and air at atmospheric pressure. The discharge development is investigated at …
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Studies of the interaction of biogenic volatile organic compounds and NOx in forest environments
<p>Ozone is a pollutant that causes crop damage, adverse health effects, and is a contributor to global climate change. Ozone concentrations are predicted to rise over the next half-century along with global temperature. Ozone production is controlled by the chemistry between biogenic volatile …
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Laboratory studies on the production of alpha-pinene-derived organic nitrates and their atmospheric fate
… impacting our knowledge on tropospheric ozone production and the fate of atmospheric NO<sub>x</sub>. To lower this uncertainty, we quantified the organic nitrate yield from the OH radical oxidation of α-pinene under high NO<sub>x</sub> conditions. The α-pinene- derived nitrates created in …
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Estimating source strengths and lifetime of Nitrogen Oxides from satellite data
… involved in chemical key reactions, leading to ozone production in the troposphere. Spectral measurements from satellite platforms of the light reflected by the earth allow the retrieval of several trace gases, e.g. NO2. In this thesis, the spectra of the satellite instruments GOME and SCIAMACHY …
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… interactions. CRDS measurements were made for ozone production resulting from alpha radiation interactions in nitrogen-oxygen mixtures while the Polonium 210 alpha sources were cycled between being shielded and exposed.</p> <p>The beginning of this thesis will provide brief reviews of ionizing …
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On the Understanding of the Coastal-Urban Nexus of Weather, Air Quality and Energy
… periods of seasonal extremes such as summer ozone peaks and winter heating. Accurate representation of these interactions in urban modeling is crucial for understanding and addressing air pollution and energy management challenges in cities. This research presents a comprehensive study that …
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MEASUREMENTS OF ATMOSPHERIC RADICALS IN AMBIENT AND INDOOR ENVIRONMENTS: OUTDOOR-INDOOR RELATIONSHIPS, INDOOR FORMATION MECHANISMS, AND INSTRUMENTAL ANALYSIS
… the presence of nitrogen oxides (NOx) can form ozone and secondary organic aerosols (SOA)—air pollutants affecting human health and welfare in ambient and indoor environments. In ambient environments with high mixing ratios of biogenic VOCs and low mixing ratios of NOx, measurements using our …
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Applications of Adjoint Modelling in Chemical Composition: Studies of Tropospheric Ozone at Middle and High Northern Latitudes
Ozone is integral to tropospheric chemistry, and understanding the processes controlling its distribution is important in climate and air pollution contexts. The GEOS-Chem global chemical transport model and its adjoint are used to interpret the impacts of midlatitude precursor emissions and …
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Measurement, Modeling, and Analysis of Ozone and its Key Precursors in the Southeast United States National Parks
Lower tropospheric ozone (O3) continues to be a major air pollution problem in the southeast United States due to its adverse effects on humans and the environment. This study presents measurements, modeling, and interpretation of ozone (O3) and its key precursors based on measurements collected …
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Functional characterisation of alkane-degrading monooxygenases in Rhodococcus jostii strain 8
… that contribute to photochemical pollution and ozone production in the atmosphere. A number of studies have shown that Rhodococcus species possess the ability to metabolite a wide range of hydrocarbons since they contain multiple hydrocarbon-degrading enzymes such as soluble diiron …
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Chemistry-climate modelling studies of decadal and interdecadal variability in stratospheric ozone and climate: The 11-year solar cycle and future ozone recovery
… solar cycle forcing and future stratospheric ozone recovery. Firstly, following recent improvements in the model, the atmospheric response to the solar cycle forcing simulated in UMUKCA is discussed. It is shown that while some features show a broad resemblance to observations/reanalysis, …
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Understanding the formation of secondary organic aerosol and the fates of organic nitrates formed from monoterpene oxidation
… from the atmosphere, directly suppressing the ozone production near source regions. To what extent organic nitrates affect atmospheric oxidation capacity largely depends on their fates; whether NOx is released back or permanently removed. Chemistry about the monoterpene SOA formation and the …
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Tropical transport and the seasonal variability of the subtropical "edges" in the stratosphere
… stratosphere, in particular the balance between ozone production and loss, is very sensitive to transport into and out of the tropical stratosphere. There is a great deal of evidence that tropical air remains relatively isolated from extratropical air over timescales that are long compared to …