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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

An assessment of the contribution of micro-scale activities to personal pollution exposure in commuting micro-environments : a thesis submitted in partial fulfilment of the requirements for the degree of Masters [i.e. Master] of Science in Geography at the University of Canterbury /

Shrestha, Kreepa. January 2009 (has links)
Thesis (M. Sc.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (p. [192-210]).
62

Bayesian and Positive Matrix Factorization approaches to pollution source apportionment /

Lingwall, Jeff W. January 2006 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Statistics, 2006. / Includes bibliographical references (p. 96-98).
63

Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors

BEGG, Nathon 18 May 2011 (has links)
This research studied the effects of evaporative spray cooling on air-air ejector performance. Experimental data was collected for the purpose of validating computational simulations. This was done by modifying an existing air-air ejector to accommodate four spray flow nozzles which were used to atomize cooling water. The only parameter that was varied throughout the study was the mass flow rate of cooling water. One single phase (air) case and four spray flow cases where performed and analyzed. The purpose of the single phase experiment was to have a baseline for the air-air ejector performance and isolate the sources of experimental error contributed by spray flow. Three specialized multiphase flow instruments were designed and fabricated by the author to measure, gas phase temperatures, spray mass flow rates, and mixture total pressures. A computational study was performed using the collected experimental data for inlet continuous phase and spray mass flow as boundary conditions for equivalent simulations. A temperature gradient modified turbulence model was written by the author to better predict the mixing rates found experimentally which was used for the duration of this research. Secondary droplet breakup was modeled by the author using empirical correlations following preliminary simulations recognizing the deficiencies of commercially available breakup models. Comparison of experimental and computational cases produced mixed results. It was found that the experimental gas temperature instrument performed poorly for the local droplet fluxes encountered during testing. The spray sampling probe showed more promising results with two integrated mass flows agreeing within 6% of computational simulations. The total pressure probe solved the issue of pressure port clogging, but measurements were representative of mixture density which made an inferred velocity calculation difficult. It was found that evaporation of spray flow before the nozzle exit plane caused a reduction in dynamic pressure and a reduction in back pressure. A full scale simulation was performed to determine the effects of scaling on evaporative spray cooling performance. It was found that for the geometrically similar full scale model, the total droplet surface area and particle residence times scaled up with the model which increased cooling performance. / Thesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2011-05-18 14:47:50.52
64

Measuring and modelling of volcanic pollutants from White Island and Ruapehu volcanoes : assessment of related hazard in the North Island : a thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Canterbury /

Grunewald, Uwe. January 1900 (has links)
Thesis (Ph. D.)--University of Canterbury, 2007. / Typescript (photocopy). "May 2007." Includes bibliographical references (p. 239-253). Also available via the World Wide Web.
65

Methyl halides : concentrations, fluxes and stable carbon isotope ratios measured in the atmosphere, coastal waters, and soils /

Huset, Regina Anne. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 188-206).
66

Chemical and biological characterization of southern Ontario urban air particulate.

Legzdins, Arnold E. McCarry, B.E. Unknown Date (has links)
Thesis (Ph.D.)--McMaster University (Canada), 1996. / Source: Dissertation Abstracts International, Volume: 58-06, Section: B, page: 3006. Adviser: B. E. McCarry.
67

Choice experiments application to air quality policy options and investigation of method's incentive compatibility /

Collins, Jill Phillips, January 2007 (has links) (PDF)
Thesis (Ph. D.)--University of Tennessee, 2007. / Title from title page screen (viewed on Oct. 23, 2007). Thesis advisor: Michael McKee. Vita. Includes bibliographical references.
68

Three empirical investigations in environmental economics /

McCubbin, Donald R. January 1998 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.
69

Analysis and control of organic vapours in air and determination of metals and toxic elements in fish samples by differential pulse voltammetry and atomic absorption spectrophotometry /

Tsang, Chi-kin. January 1991 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1993.
70

A feasibility study of switching from the diesel to petrol light road transport to improve the urban air quality in Hong Kong /

Sun, Wai-choi, Sunny. January 1995 (has links)
Thesis (M. Sc.)--University of Hong Kong, 1995. / Includes bibliographical references.

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