Search for dissertations about: "aging process"
Showing result 1 - 5 of 217 swedish dissertations containing the words aging process.
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1. Aging effects on commercial lean NOx trap catalysts
Abstract : As a countermeasure to global warming, vehicles with low carbon emissions are being investigated by promoting lean-burn engines and high combustion efficiencies. However, one limitation to the increasing use of these engines is the need to develop corresponding catalytic systems for controlling the nitrogen oxide (NOx) emissions in their lean exhaust. READ MORE
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2. Titania supported vanadium oxide catalysts in the NH3-SCR reaction: Effect of vanadium loading, promoters and aging
Abstract : Emissions of nitrogen oxides (NOx) from combustion processes in mobile sources attract significant attention due to their role as a major source of atmospheric contamination, along with health risks and environmental issues. Since combustion processes in heavy-duty vehicles are expected to be used for a foreseeable future, many efforts have been invested in a suitable deNOx technology. READ MORE
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3. Understanding "successful aging" : Cultural and migratory perspectives
Abstract : This dissertation aims to contribute to the rectification of the atheoretization that characterizes the study of aging and diversity through the formulation and preliminary empirical testing of a culturally-relevant theoretical framework for the study of successful aging. Inspired by the Kluckhohnian approach to the study of cultural variation, the framework hereby proposed posits that there is congruence between the understandings of successful aging that people uphold and the value orientations that they prefer in regards to four topics: man-nature, time, activity and relational. READ MORE
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4. Vehicle emissions abatement: NO oxidation and ammonia SCR
Abstract : The design and the development of catalytic systems for reducing vehicle emissions is a complex task due to the variety of components in a wide range of gas flow and temperature. A complete system is, therefore, composed of a series of catalysts or catalytic systems, each of which is dealing with a particular aspect of the abatement process. READ MORE
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5. Hydrothermal Liquefaction of Lignin into Bio-Oil
Abstract : Lignin, one of the three main components of lignocellulosic biomass, is the second most abundant organic polymer found on Earth. Nowadays, most of the lignin (almost 99%) produced in the Kraft pulping process is used as internal fuel. READ MORE