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 30 for “"Mass Concentrations"”.
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Optical Remote Sensing of Airborne Particulate Matter to Quantify Opacity and Mass Emissions
… developed to obtain in-situ measurements of PM mass emissions for the dust plumes that are generated from unique military activities. The method was then tested in the field to measure dust emissions from artillery back blast and tracked vehicle movement in desert areas. Dust plumes were also …
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Determining The Effectiveness Of Satellite Remote Sensing Products To Quantify Aerosol Pollution In The Semi-Arid Western U.S.
… an aerodynamic diameter smaller than 2.5 μm) concentrations. Satellite-derived PM2.5 estimates are relevant to improve the spatial resolution of air pollution concentration estimates due to the sparse number of PM2.5 monitoring stations. PM2.5 concentrations have been successfully estimated …
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Characterisation of atmospheric single particles in industrial and regional background environments using aerosol time of flight mass spectrometry
… health. In this study, an aerosol time-of-flight mass spectrometer (ATOFMS) was used to measure the chemical composition of ambient single particles at two contrasting locations – an industrial site in Dunkirk, France and a regional background site in Corsica. The ATOFMS data were combined with …
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Inhalation exposure system for diesel exhaust particulates
… evaluated for aerosolizing DEP, monitoring the mass concentration and size distribution, and determining the uniformity of the aerosol.;The Jet-O-Mizer jet mill produced a single mode DEP mass median diameter (MMD) of 0.33 mum while maintaining a relatively steady mass concentration of 10 mg/m3. …
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Understanding the formation of secondary organic aerosol and the fates of organic nitrates formed from monoterpene oxidation
… extent. Lastly, the response of an aerosol mass spectrometer (AMS) towards particulate organic nitrates was calibrated and evaluated using synthetic standards of monoterpene and isoprene organic nitrates. The nitrogen-containing moiety mass concentrations measured by the AMS corresponded to …
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Evaluation and Calibration of Coupled Low-Cost Particulate Matter Sensors
… purportedly uses the PMS5003 to estimate the mass concentration of particles below the detection limit of the OPC-N3; in this case, the MOD-PM uses both the PMS5003 and OPC-N3 to calculate PM2.5 estimates and uses only the OPC-N3 to calculate PMCoarse estimates. This brings to question how …
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Observed microphysical characteristics and inferred thermodynamic processes contributing to the structure, evolution, and maintenance of nocturnal elevated mesoscale convective systems
… below the ML due to changes in particle concentrations accompanying increases in particle fall velocity with the phase change across the ML. The environment above the ML moistened between subsequent RIJ spirals, concurrent with maturation of the MCS and closer proximities to the …
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Analytical Approaches for Analyzing Microplastics Using Pyrolysis Gas Chromatography Mass Spectrometry and Accelerated Solvent Extraction
… act as major sinks for microplastics, yet robust mass-based quantification of polymer composition in these complex matrices remains analytically challenging. This study applies an integrated accelerated solvent extraction (ASE) and pyrolysis–gas chromatography–mass spectrometry (Py-GCMS) workflow …
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Airborne Nanoparticles: Generation, Characterization, and Occupational Exposure
… of field studies to measure the fine particle mass concentrations (PM2.5) as well as nanoparticle number concentrations and size distributions in two nanomaterial manufacturing facilities. Measurements were performed near the reactor, in the breathing zone, and at a background site. Increases …
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Mathematical modeling of heavy metals diffusion and removal from cylindrical cement forms coated with bio-film
… a partial differential equation describing the mass transfer of the targeted species as it moves through the encapsulating cylinder toward the surroundings. The nature of the species interaction at the surface of the cylinder renders an otherwise linear problem to be nonlinear. However, by …
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Real time analysis of atmospheric single particles in urban environments using aerosol time of flight mass spectrometry
… fossil fuel combustion and 14% attributed to biomass burning. Furthermore, 79% of the EC was apportioned to local emissions and 21% to continental transport. The carbonaceous particle types were compared with quantitative measurements from other instruments, and while direct correlations using …
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Simulating the atmospheric primary and secondary organic aerosols
… performance of the model in reproducing organic mass concentrations is average during all four seasons of the year. The agreement between the predicted and observed temporal profiles suggests a reasonable understanding and depiction in the model of the corresponding processes. However, this …
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Atmospheric chemistry and aerosol associated with the coastal urban environment
… (particles with diameters of 2.5 m or smaller) concentrations are ~30% larger on days with southerly wind or sea breeze recirculation compared to those under other wind patterns. On southerly wind days, 53% of PM2.5 was attributed to long-range transport of soil. In contrast, on sea breeze …
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Analysis of contributions to the PM10 concentration in a gold mine residential village
… as significant contributor to overall PM10 mass concentrations with up to 34% in the winter season. Source appointment from receptor-based measurements has not been previously conducted at Driefontein Gold Mine. Source apportionment can make a valuable contribution in attempts to reduce air …
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A Monte Carlo-based Model Of Gold Nanoparticle Radiosensitization
… significant for low-energy sources. At equal mass concentrations, AuNP size did not impact radiosensitization unless the AuNPs were localized in the nucleus. This novel predictive model of AuNP radiosensitization could help define the optimal use of AuNPs in potential clinical strategies by …
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Investigation of energy storage options for thermal management in hybrid electric vehicles
… by sing EES program show that an increase in PCM mass fraction results in an increased exergy efficiency of the system which is mainly due to the decrease of compressor work. In order to improve the thermal conductivity of n-octadecane as the selected phase change material, carbon nano-tubes and …
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Mass, Composition, Source Identification and Impact Assessment for Fine and Coarse Atmospheric Particles in the Desert Southwest
… means of furthering our understanding of ambient concentrations and composition in rural, arid environments. Detailed measurement of ambient fine and coarse mass, ion, metal, and carbon concentrations at one-in-six day resolution was conducted at three sites from February 2009 to February 2010. …
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Participatory Methods in Technical Design: Household Biomass Stoves
… thesis, I analyze a case study of improving biomass stoves in the Himalaya through the lens of participatory design to inform design practice and research. Biomass cooking and heating cause high levels of indoor air pollution especially in the Himalaya where households need accessible and …
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Evaluation and improvement of optical remote sensing methods in monitoring particulate matter emissions and plume opacity
… and implemented previously to measure PM mass emission factor (EF) and plume opacity. My contributions to this research are: 1) evaluating and improving the previous approaches used in these two methods, and 2) estimating their associated uncertainties to quantify PM EF and plume opacity …
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