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.
Results
Showing 1 to 20 of 84 for “"Pollutant Emissions"”.
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Towards an improved procedure for estimating industrial-pollutant emissions
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1992.
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A study of ground-level air pollutant emissions from airport mobile sources
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
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Investigations on the pollutant emissions of gasoline direct injection engines during cold-start
… in most engine operation regimes, creates emissions challenges during the cold crank-start and cold fast-idle phases. The engine cold-start is responsible for a disproportionate share of the hydrocarbons (HC), nitrogen oxides (NOx) and particulate matter (PM) emitted over the certification …
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Characterization of Urban Air Pollutant Emissions by Eddy Covariance using a Mobile Flux Laboratory
… the US are developed largely from estimates of emissions, some highly uncertain, rather than actual measurements. Improved knowledge based on measurements of real-world emissions is needed to increase the effectiveness of these strategies. Consequently, the objectives of this research were to …
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Engine Technologies for Reduction of Fuel Consumption and Pollutant Emissions in Light-Duty Diesel Engines
L'abstract è presente nell'allegato / the abstract is in the attachment
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Experimental Investigation on Different After-treatment Technologies for the Control of Pollutant Emissions from Automotive Diesel Engines.
… efficiency (lower fuel consumption and CO2 emissions), drivability, durability and reliability. Increasing concerns regarding the two main pollutants from Diesel engines, NOx and PM, started a progressive process of tightening of emission limits; Tier 2 (USA) and Euro5b/6 (Europe) emissions …
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Air quality impacts and benefits under U.S. policy for air pollution, climate change, and clean energy
Policies that reduce greenhouse gas emissions can also reduce outdoor levels of air pollutants that harm human health by targeting the same emissions sources. However, the design and scale of these policies can affect the distribution and size of air quality impacts, i.e. who gains from pollution …
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Neural Network Modelling and Control of Coal Fired Boiler Plant
… to increase combustion efficiency and maintain pollutant emissions below future medium term stringent legislation. Artificial Neural Networks (ANNs) were used to estimate future emissions from and control the combustion process. Initial tests at Casella CRE Ltd demonstrated the ability of ANNs …
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Finalità, strategie e strumenti per lo sviluppo di un modello di calcolo delle emissioni degli inquinanti da traffico in ambiente urbano
… the analysis of the different parameters on the pollutant emissions and the construction of computer tools and abacus for the energetic and environmental assessment of the policies and technologies having an impact on the traffic conditions. This led to the definition of an emission model for the …
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Evaluation of advanced air-fuel ratio control strategies and their effects on three-way catalysts in a stoichiometric, spark ignited, natural gas engine
Engine emissions are a growing concern in the 21st century. As the world works to combat rising pollution levels, engine emissions are under scrutiny. Natural gas engines are increasing in popularity over diesel engines, due to the high availability of fuel and fewer pollutant emissions than …
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experimental investigation of a reacting transverse jet in a high pressure oscillating vitiated crossflow
… approach in a gas turbine engine to reduce pollutant emission levels. In axially staged combustion, portions of the air and fuel are injected downstream of a lean premixed low NOx primary combustion zone. The gas residence time at elevated temperatures is decreased resulting in lower thermal …
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The Monitoring and Control of Stoker-Fired Boiler Plant by Neural Networks
… the combustion efficiency whilst minimising pollutant emissions. A novel Neural Network Based Controller (NNBC) was developed following a comprehensive set of experiments carried out on a stoker test facility at the Coal Research Establishment (CRE) Ltd., before being evaluated on an …
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Mitigating emissions and energy consumption for urban transportation networks : simulation-based signal control strategies
… with instantaneous energy consumption and emissions models to yield detailed network-wide estimates of energy consumption and pollutant emissions. Nonetheless, there is currently a lack of computationally efficient optimization techniques that enable the use of these complex integrated …
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Managing freight transportation and air quality in the Mexico City Metropolitan Area
… these strategies a model linking freight demand, pollutant emissions and costs was developed. The results of our analysis show that it could be possible to achieve substantial and sustained freight emissions reductions by using newer and cleaner technologies for freight vehicles, as well as better …
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Modelling of turbulent stratified flames
Due to concerns about pollutant emission combustion systems are increasingly being designed to operate in a lean premixed mode. However, the reduction in emissions offered by lean premixed combustion can be offset by its susceptibility to instabilities and ignition and extinction problems. These …
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Scaling air quality effects from alternative jet fuel in aircraft and ground support equipment
… factors were developed for airport criteria pollutant emissions to model alternative jet fuels in aircraft and ground support equipment. These linear scaling factors were based on currently published studies comparing standard diesel and jet fuels with alternative jet fuels. It was found that …
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Aircraft Greenhouse Gas Emissions during the Landing and Takeoff Cycle at Bay Area Airports
… impacts. Throughout all phases of air transit, pollutant emissions, including greenhouse gases (GHGs), are released. The goal of this study is to quantify and characterize these emissions produced from aircraft in the LTO cycle at Bay Area airports.</p> <p>FAA data was used along with the …
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Impact of ventilation system operation and building products on perceived indoor air quality
… determined per human occupant regardless of the pollutant emissions from building materials, ventilation systems and other sources. With the intention of saving energy, the ventilation systems in many office buildings are turned off during the night. This process may reduce the quality of indoor …
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Using the greet model to analyze algae as a feedstock for biodiesel production
… energy use, fossil fuel use, greenhouse gas emissions, and criteria pollutant emissions using a simulation developed by Argonne National Laboratory. The energy and emissions of algae-derived biodiesel are compared to those of soybean biodiesel, corn ethanol, conventional gasoline, and …
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