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 48 for “"dispersion model"”.
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A two-dimensional global dispersion model applied to several halocarbons
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology and Physical Oceanography, 1983.
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Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model
… Theoretical studies performed using a simple dispersion model showed that this inherent shortcoming could be largely minimized by reconfiguring the columns to operate in series as a cell-to-cell circuit. Follow-up field data showed that this low-cost modification increased flotation recovery …
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Development and testing of a methodology for attributing sources of airborne pollutants to their receptors
… in detail in order to satisfy the needs of air dispersion model. A new software package for the atmospheric dispersion models was also developed by the author using Microsoft Visual C++. In contrast to other available software packages, this package offers a choice of different atmospheric …
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Spectral stability of solutions to Whitham-type equations with a nonlocal kernel
… parameter ν, that determines the strength of the dispersion, was solved and its stability spectra analyzed. This model is expected to have both stable continuous solutions and unstable breaking solutions, depending on the parameter ν. The solution method worked well across all examples and …
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Proton Compton scattering with polarized γ rays
… data and with calculations from the fixed-t dispersion model, the isobar model and the finite energy dispersion model. Although all these calculations agree fairly well with unpolarized cross section data, the photon asymmetry data show that the isobar model contains serious defects. The …
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Accounting for midblock pedestrian activity in the HCM 2010 urban street segment analysis
… The methodology involves applying a platoon dispersion model to: a) predict the vehicle arrival flow profiles at a downstream signalized intersection; b) use the predicted arrivals to compute the proportion of vehicle arrivals on green; and c) subsequently estimate the delay, travel speed and …
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Modeling Traffic Dispersion
The dissertation studies traffic dispersion modeling in four parts. In the first part, the dissertation focuses on the Robertson platoon dispersion model which is the most widely used platoon dispersion model. The dissertation demonstrates the importance of the Yu and Van Aerde calibration …
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Development and demonstration of a high-performance Gaussian puff model for nuclear emergency training scenarios in unity game engine
… detailed preparations and training. Computer models provide an avenue to simulate the presence of radioactive sources and/or releases of radioactive material safely, but the calculations involved can be complex and time- consuming. Increasing computer processing power and advanced coding …
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Developing ozone dispersion and reaction models and conducting a thermodynamic study for safety evaluations of an indoor air pollution abatement pilot plant
A Dispersion model for ozone inside the rectangular duct of an indoor air quality pilot plant was simulated. Using this the concentration profiles of ozone at several points downstream of ozone insertion were simulated and they matched well with experimental results. Recommendations for future work …
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Wireless Dust Sensor Network for a Feedlot Dust Abatement Study
… images using a low-cost USB microscope. The Box Model was used to calculate the emissions from measured concentrations at a source location and a Gaussian Dispersion Model predicted the concentration at a downwind location. Dust plume modelling showed six low-cost sensors with 20% error resulted …
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An evaluation of meteorological data needs for urban pollution modelling
Atmospheric dispersion models are being increasingly used by local authorities in the United Kingdom as part of their urban air quality management programmes. Output from dispersion models now forms a vital part of any environmental impact assessment, road improvement or traffic management scheme …
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Interagency Modeling Atmospheric Assessment Center local jurisdiction: IMAAC operations framework
The Interagency Modeling Atmospheric Assessment Center (IMAAC) is a Department of Homeland Security (DHS) interagency working group responsible to create atmospheric air plume dispersion model predictions for designated emergencies. When 'activated' IMAAC is comprised of representatives from eight …
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Il contributo di sorgenti locali sull'impatto ambientale da Diossine e Furani
… local level, through the analysis of measured, modelled and literature data. The investigation on PCDD/F air concentration was carried out in an area of 600 km2, using air quality data measured by the institutional monitoring network, data obtained from AERMOD simulations and literature data. …
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Air pollution modelling for the greater Cape Town region
Limited research on dispersion modelling for the Cape Town metropolitan area has been undertaken. This thesis deals with air-pollution aspects in relation to dispersion modelling, as well as with the input requirements and application of a dispersion model in the Greater Cape Town region. An EPA …
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Model studies of plasma heating in the continuous casting tundish.
A room temperature water model of a tundish was design, constructed and operated. The model was equipped with a steam heating system that simulates that simulates the tundish plasma heating systems operated by some of the more modem continuous casting plants. Similarity between steam heating in the …
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Hydrogen Sulfide Flux Measurements And Dispersion Modeling From Constr
… In addition to the h2s flux measurements, dispersion modeling was conducted, using the epa dispersion model, industrial source complex short term (iscst3), in order to evaluate impacts on landfill workers and communities around the landfills. The modeling results were analyzed to estimate …
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Verification Of FAA's Emissions And Dispersion Modeling System (EDMS)
… point, line and area sources, making emissions modeling for airports very complex and more involved. Accurate air quality models, specific to airport needs, are required to properly analyze this complex array of air pollution sources created by airports. Accurate air quality models are needed to …
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Mesometeorological modelling and trajectory studies during an air pollution episode in the lower Fraser Valley, British Columbia, Canada
… this study employed the Regional Atmospheric Modelling System from Colorado State University, a non hydrostatic, three-dimensional mesoscale modelling system to simulate the detailed structure of air flows over the valley for one specific episode day. Significant code modifications have been …
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Exclusions Zones for Small Modular Reactors
… were verified against those of a more complex model for a typical CANDU reactor. The obtained results were then employed to estimate the radius of the exclusion zone, by determining the distance at which the dose is at or slightly below the permitted dose to a member of the public. The method …
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