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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 50 for “"nitrogen oxide"”.
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Nitrogen oxide delivery systems for biological media
Elevated levels of nitric oxide (NO) in vivo are associated with a variety of cellular modifications thought to be mutagenic or carcinogenic. These processes are likely mediated by reactive nitrogen species (RNS) such as nitrogen dioxide (NO2) and peroxynitrite formed from the respective reactions …
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Nitrogen oxide emissions from circulating fluidized bed combustion
… effect of limestone on oxidation of volatile-nitrogen. However, adding limestone during petroleum coke combustion reduced NOT emission. A relationship exists between fuel-nitrogen to NOT conversion and the volatile content of the fuel, with fuels of higher volatile content emitting more NO. …
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Nitrogen oxide formation in laminar methane-air diffusion flames.
Thesis. 1975. Sc.D. cn--Massachusetts Institute of Technology. Dept. of Chemical Engineering.
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Nanocomposites for nitrogen oxide emissions control in lean-burn engines
(cont.) reducing agent than propane in the SCR of NO. Pt-Rh/CuO/A1₂O₃ nanocomposites capable of adsorbing SO₂ in oxygen-rich environment as metal sulfates and releasing SO₂ in reducing atmosphere were synthesized with sequential precipitation technique. These CuO-based sorbents possessed excellent …
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Analysis of nitrogen oxide emissions produced during combustion of cracked-ammonia fuels
… decomposition of ammonia to produce hydrogen and nitrogen. Conventional ammonia cracking produces NH3/H2/N2 fuel mixtures. Our research group has developed a catalytic membrane reformer that rejects nitrogen, and produces NH3/H2 blends. To date, little attention has been paid to the potential …
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Experimental investigation of nitrogen oxide production in premixed reacting jets in a vitiated crossflow
… work describes the experimental investigation of nitrogen oxide (NOx) emissions from reacting jets in a vitiated crossflow (RJICF). It is motivated by interest in axial staging of combustion as an approach to reduce undesirable NOx emissions from gas turbine combustors operating at high flame …
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Computational Modeling of Nitrogen Oxide Emissions From Biodiesel Combustion Based on Accurate Fuel Properties
Computational modeling was applied to evaluate strategies for reducing NOx emissions from biodiesel combustion. The results indicated that increasing spray cone angle, retarding start of injection, applying exhaust gas recirculation (EGR) and charge air cooling were all effective in reducing NOx …
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Fuel/air Mixing and Nitrogen Oxide Formation in a Lean Premixed Gas Turbine Combustor
A chemical reactor design tool model was developed to predict engine-out NOx concentrations for lean premixed combustors. The CRM model only requires information regarding the reactor loading, the combustor inlet state, and the combustor geometry. Model improvements were obtained by including the …
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Evolution of Nitrogen Oxide(s) From Soybean and the Association of This Activity to the Constitutive Nad(p)h-Nitrate Reductase Enzyme
… (L.) DC. cv Lunita) leaflets. Nitric oxide (NO) and nitrous oxide (N$\sb2$O) were identified as the main N products formed. NO and N$\sb2$O produced from soybean leaflets were both labeled with $\sp $N when $\sp $N-nitrate was used in the assay medium, demonstrating that both were …
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Reducing the contribution of the power sector to ground-level ozone pollution : an assessment of time-differentiated pricing of nitrogen oxide emissions
Nitrogen oxide (NOx) is a prevalent air pollutant across the United States and a requisite precursor for tropospheric (ground-level) ozone formation. Both pollutants significantly impact human health and welfare, so National Ambient Air Quality Standards (NAAQS) have been established for each. As …
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Implementing a time- and location-differentiated cap-and-trade program : flexible nitrogen oxide abatement from power plants in the eastern United States
… amount of ozone formed from a given amount of nitrogen oxide (NOx) by a factor of five (Mauzerall et al. 2005). Yet existing NOx cap-and-trade programs require stationary sources in the Eastern U.S. to reduce emissions without reference to timing or location. This work is part of a larger study …
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A cost-effectiveness analysis of alternative ozone control strategies : flexible nitrogen oxide (NOx) abatement from power plants in the eastern United States
… atmospheric concentrations of its precursors, nitrogen oxide (NOx) and Volatile Organic Compounds (VOC), as well as on temperature and the available amount of sunlight. The dependence of ozone formation on meteorology makes the timing of emissions important, suggesting the need for a temporally …
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Reactive based NOx sensor
… technology has virtually eliminated carbon monoxide and particulate emissions. Sulfur oxide emissions have been eliminate by the use of ultra-low sulfur fuel. Nitrogen oxide (NOx) emissions are still not in line with up-coming EPA regulations. NOx sensors are required for all catalysts being …
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A novel mechanism for metal alloying at the nanoscale
… catalysts with -100% conversion and >99% nitrogen oxide selectivity over prolonged operations. This mechanism is distinct from previously reported alloying processes, which can bring about a new repertoire of alloys and nanostructures with unprecedented functionalities.
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Turbulent Exchange of Ozone and Nitrogen Oxides between an Amazonian Rain Forest and the Atmosphere
… the deposition of constituents like ozone and nitrogen oxides, which are of high relevance for tropospheric chemistry. To asses the effect of land use change on tropospheric chemistry, a good knowledge of the exchange of those trace gases between the primary rain forest ecosystem and the …
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Impact of Air Pollution on Stroke Incidence in Texas
… considered in this study were carbon monoxide, sulfur dioxide, nitrogen oxide, particulate matter (PM) 2.5, PM 10, volatile organic compounds and total criteria air pollutant. The stroke death rate was collected for the year 1999. With the stroke death rate as a dependent variable and …
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Do Roundabouts Work? An Evaluation for Uniform Approach Demands
… illustrates that fuel consumption and carbon dioxide, carbon monoxide, hydrocarbon and nitrogen oxide emissions can be improved with roundabout control over other intersection control strategies. The research presented here demonstrates that for low traffic demand levels roundabouts should be …
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Conceptual evaluation of hydrogen hybrid combustion for heavy-duty engines using CFD modelling
… properties and potential for zero carbon/low nitrogen oxide emissions. This study investigates a novel hydrogen combustion concept for heavy-duty engines using pre-chamber ignition technology operating in a hybrid combustion mode combining spark-ignition and diffusive combustion. Computational …
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
… However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an in-cylinder combustion sensor. The ion current sensor has been used for …
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Density Functional Study of NO Decomposition With Cu-Exchanged Zeolites
… here could play a role in other non-zeolitic nitrogen oxide transformation reactions as well.
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