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 68 for “"Emission factors"”.
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Carbon Dioxide and Hydrogen Sulfide Emission Factors Applicable to Wastewater Wet Wells
… The extent of these problems depends on the emission rates of gases in the sewer atmosphere. To limit these kinds of problems an estimate of the gases emitted from the sewer network is to be known. In consideration to the above mentioned problems, a research has been taken up to estimate the …
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Total Fume and Heavy Metals Emission Factors Applicable to Aluminum-Lithium Alloy Welding
… filler rods, electrodes, and environmental factors, welding is a major process used in industry, commerce, and service sectors. The focus of this research is to understand the fumes generated by the Tungsten Inert-Gas (TIG) welding on Aluminum-Lithium Alloy (Al-Li Alloy), estimate applicable …
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Evaluation of Productivity, Consumption, and Uncontrolled Total Particulate Matter Emission Factors of Recyclable Abrasives
… and uncontrolled total particulate matter (TPM) emission factors (in terms of mass of pollutant emitted per unit area cleaned and mass of pollutant emitted per unit mass of abrasive consumed). Though there have been various attempts in the past to evaluate the performance of these abrasives, …
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Determining Emission Factors from Marine Vessels Employing Differential Optical Absorption Spectroscopy (DOAS) and Tunable Diode Laser Absorption Spectroscopy (TDLAS)
… Maritime Organization (IMO) regulates SO2 emissions by requiring ships to use fuel with varying degrees of sulfur depending distance from land. Due to lack of techniques for measuring emissions, regulations are often violated, leading to higher pollution levels. In this thesis, a method was …
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The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves
… was performed. As such, the greenhouse gas (GHG) emissions and energy consumption per unit mass of materials were computed and combined to develop a regional LCI database. The study updated the existing vehicle emission factors through simulations using EPA’s newest vehicle emission simulator, …
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Field emission measurements of solid fuel stoves in Yunnan, China
Emission factors of carbon monoxide (CO), particulate matter (PM2.5), organic carbon (OC), and elemental carbon (EC), as well as combustion efficiency and particle optical properties were measured during 37 uncontrolled cooking tests of residential stoves in Yunnan Province, China. Fuel mixtures …
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Emissions from combustion technologies with a focus on brick making and in-home cooking
Emissions from seventy household stoves in Tibet and Nepal and thirteen brick kilns in South Asia were measured to quantify aerosol and gaseous pollutant emissions, including particulate matter (PM 2.5), carbon monoxide (CO), carbonaceous particles, and optical scattering and absorption. In …
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Measurements that fill gaps in emission inventories: gas flares, household biomass stoves, and brick kilns
… purpose of this body of work is to fill gaps in emission inventories that in turn serve as inputs to global climate models. Emissions of aerosols are a focus because they can vary by orders of magnitude even for the same fuel, making field emissions measurements necessary. Three sources were …
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Mobile Laboratory Measurement of Black Carbon, Particulate Polycyclic Aromatic Hydrocarbons and Other Exhaust Emissions in Mexico City
… BC, PPAHs and many other gas- and particle-phase emissions were measured in Mexico City using a mobile laboratory during the Mexico City Metropolitan Area field campaign in April 2003 (MCMA-2003). The main goal of this research is to estimate emissions of BC and particulate PAHs (PPAHs) for Mexico …
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Performance and Total PM Emission Factor Evaluation of Expendable Abrasives
… widely used methods of surface preparation. Air emissions from this process include particulate matter (PM) and metals. Spent abrasive generated from this process may be hazardous in nature. With increasing concern on health effects due to silica emissions from sand, use of alternative materials …
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The effect of operating conditions on emissions from a two-stage lump coal combustor
… NO<sub>x</sub>, SO<sub>x</sub>, and smoke. The emissions can be reduced by varying the burning conditions in the stove. This investigation studied the effect of various burning conditions on the emissions from a two-stage lump coal combustor burning Wyoming bituminous coal. The parameters that …
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Simplified real-time PAH measurement techniques
… for polycyclic aromatic hydrocarbon (PAH) emissions from these stoves. Design of stoves that reduce PAH emissions has been hampered because existing PAH measurement techniques are slow, complex, and expensive. This study investigates two simple, inexpensive, real-time PAH measurement …
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Emissions, efficiency, and combustion chamber conditions of a smokeless, hand-fired coal heater
The emissions, efficiency, and combustion chamber conditions of the Rayburn Prince 76, a clean-burning, hand-fired coal heater developed by the British have been studied. It was desired to determine if the downdraft design of the Prince would lead to low emissions when operated on American coals. …
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New Framework for Real-time Measurement, Monitoring, and Benchmarking of Construction Equipment Emissions
… pollutants. Monitoring and benchmarking emissions will provide practitioners with information to assess environmental impacts and improve the sustainability of construction. This research focuses on real-time measurement of emissions from non-road construction equipment and development of …
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Streamlined carbon footprint computation : case studies in the food industry
… hierarchy structures to organize the existing emission factors to facilitate proxy selection, but found that the hierarchy required either expert knowledge for design or large numbers of emission factors to average out the inconsistencies within the same input types. Lastly, by integrating …
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Multinational emission inventories for land-based nonroad engines and residential combustion
Current and future emission projections for use in large-scale atmospheric models are necessary in determining policies or mitigation options that will be implemented to mitigate air pollution problem and climate impacts. Nonroad engines and residential combustion contribute a large fraction of …
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Constraining black carbon emission inventories with observations
… influence of BC requires estimates of its emissions over time. This dissertation improves the long-term estimation of historical BC emissions by applying observational constraints and provides more accurate and comprehensive emission information for modeling studies. This work develops a …
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Emission Measurement of Air Pollutants from CNG-gasoline Bi-fuel Vehicles
The estimation of emission factors (EFs) is the basis of accurate emission inventory. However, the EFs of air pollutants for motor vehicles vary under different operating conditions, which will cause uncertainty in developing emission inventory. Natural gas (NG), considered as a “cleaner” fuel than …
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Exhausted with Emissions: Exploring the Link Between Anthropogenic Emissions and Urban Pollution on Public Health
… we investigate how reducing transportation emissions and other anthropogenic emissions of NOx affects local and national public health in two heavily populated and polluted areas: Los Angeles, CA and New York City, NY. We estimate the Tipping Point (TP) as well as the Break-Even Point (BEP) …
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Environmental Performance of Coal Slag and Garnet as Abrasives
… rate (ton/2000 ft2; lb/ ft2), (3) particulate emission factors (mg/ft2; mg/lb; lb/lb; lb/kg; lb/ton). In order to achieve the study objectives, an emission test facility was built and necessary equipment and materials were procured. Blasting was performed on rusted steel panels inside the test …
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