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 200 for “"Chemical species"”.
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Identification of chemical species using artificial intelligence to interpret optical emission spectra
… is an important diagnostic for monitoring plasma species within plasma processing. Normally, OES spectral interpretation requires significant prior expertise from a spectroscopist. One way of alleviating this intensive demand in order to quickly interpret OES spectra is to interpret the data using …
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Nanoparticle probes based on metal carbonyl chemical species for biological sensing with infrared spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Bioprospecting of plants species with potential to uptake inorganic chemical species from gold mine tailings and acid mine drainage
… between 1-4, high concentration of sulphate and chemical species which degrade the water quality and threaten the life of terrestrial and aquatic organisms. This study aims at bio-prospecting plant species with potential use in phytoremediation of AMD and gold mine tailings. First batch of …
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Thermomechanical Meso-Scale Modeling of Combustion of Heterogeneous Solid Propellants
… of fluid-phase equations for transport of chemical species and temperature. A simple three-step kinetics model is used to describe the complex reactions occurring in the fluid phase, and motion of the gases in the fluid phase is modeled through an Oseen assumption. A monolithic scheme is …
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Contaminant diffusion and sorption of an artificial leachate in selected geologic barriers of Frankonia, Bavaria, Germany
… the migration of the diffusive front. A multi chemical species synthetic landfill leachate was contrived to simulate and evaluate natural pollutant conditions. A computational method for determining mineralogy from geochemical data was also developed. It was found that sorptive processes are …
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Modeling Material Degradation Due to Moisture and Temperature
… stimuli, which include exposure to a corrosive chemical species, high temperatures, temperature fluctuations (i.e., freezing-thawing), cyclic mechanical loading, just to name a few. It is, therefore, of paramount importance in several branches of engineering – ranging from aerospace engineering, …
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Modeling nighttime chemistry with WRF/chem: sensitivity to vertical resolution and boundary layer parameterization
… vertical profiles of gas phase and aerosol phase species in the nocturnal boundary layer. Resolving these profiles adequately is a prerequisite for a good representation of nighttime chemistry and poses an important modeling challenge. In this work we explore the sensitivity of the model results …
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Effects of biomass-burning aerosol loading on Southern African climate
… forcings will be obtained from different chemical species, and, therefore, different circulation patterns are likely to be induced over all seasons, regardless of how large the emissions loading and/or concentrations are.
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Electrochemical and Magnetochemical Approaches for Neuronal Modulation
The development of tools to deliver chemical signals to specific neurons can enhance our understanding of chemical signaling in the nervous system and enable chemical therapies for neurological disorders. Existing technologies for chemical neuromodulation, including intracranial injection of …
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Performance limits on chemical computation
… computers uses solute concentrations of distinct chemical species as logic signals and diffusion for signal transport. I establish a bound on the speed, density, and error rate of such computers from first principles. I let the chemical computer engineer choose a "design tuple" of independent …
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Modeling of particulate matter creation and evolution in aircraft engines, plumes and particle sampling systems
… composition of aircraft engines. Besides major chemical species (N₂, 0₂, C0₂ and H₂0), aircraft engines also emit other species in much lower concentrations but that may also have significant impacts. Particulate Matter (PM) belongs to this category. This thesis presents a model of the …
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Assessment of magic angle spinning spectroscopy for studying migration in solid milk chocolate
… deliver diffusion data specific to individual chemical species. Using a Bruker 300 MHz spectrometer equipped with liquid state and hr-MAS probes various spectroscopic characteristics of a milk chocolate sample were recorded. The MAS spectrometer resolved the chocolate spectrum into individual …
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Rapid Mortality of Pest Arthropods by Direct Exposure to a Dielectric Barrier Discharge
… in many countries. Limiting the movement of pest species is commonly achieved by the use of chemical pesticides at quarantine facilities. One potential alternative to chemical pesticides is direct exposure of contaminated commodities to ambient pressure electrical discharges. The arthropods are …
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Plasmonic Au nanostructures for surface-enhanced raman spectroscopy
… rich structural information for identifying chemical species but finds limited applications owing to its low sensitivity. Surface-enhanced Raman spectroscopy (SERS) is capable of solving the issue of sensitivity by enormously amplifying the Raman signal through localized surface plasmon …
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Telescopes and Techniques for the High-Resolution Characterisation of Exoplanets
… spectroscopy (HRDS) – a technique for detecting chemical species in exoplanet atmospheres. I present results from analysing high-resolution spectra of three hot Jupiters – HD 209458b, HD 189733b and 51 Pegasi b. Evidence for H2O, CO and of HCN was found in all three datasets – the latter molecule …
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Behavior of a Hypersonic Nozzle Using Finite Rate Chemistry
… flow are then discussed. A hydrogen-air chemical reaction mechanism, which is made up of fourteen different chemical species, and forty nine chemical reactions is used in this investigation for obtaining detailed chemistry flow solutions. The investigation also performs a sensitivity …
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Parallel Multigrid Method for Adaptive Finite Elements with Application to 3D Flow Problems
… The equations under consideration arise from chemically reacting flows. A focal point is the analysis of a finite element discretization with stabilized finite elements of degree two. Aspects of error estimation, solution techniques and mesh adaptivity are discussed with regard to the …
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Processes Affecting the Behavior of Redox-Sensitive Elements in Chesapeake Bay
<p>Several processes can affect variations in the chemical composition of an estuary, including (1) biogeochemical reactions in the water column, (2) advective transport, and (3) diffusion from underlying sediments.</p> <p>The purpose of the study was to establish whether estuarine redox reactions …
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Adjoint sensitivity analysis of the atmospheric impacts of combustion emissions
… emissions impact the environment through chemical and transport processes that span varying temporal and spatial scales. Numerical simulation of the effects of combustion emissions and potential corresponding mitigation approaches is computationally expensive. Atmospheric adjoint modeling …
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