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 16 of 16 for “"Aging Mechanisms"”.
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Enhanced Detection of Corrosion and Coating Aging Mechanisms Using Core-Shell Quantum Dots
<p>Understanding aging mechanisms in coatings during their servicable life is complicated, due to the inherent stochastic nature of exposure profiles, service environments, and rare weather events. Thus, the development of improved test methods for service life prediction and accelerated weathering …
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High power li-Ion battery performance: a mechanistic analysis of aging
… the battery¿s performance due to accelerated aging. The effects of battery aging are detrimental to LIB systems, reducing its performance and even causing safety issues. In fact, the aging phenomenon is a key issue in durable applications such as EVs and EES, where long-term cycling and long …
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Sub-grid process analysis of the sensitivity of black carbon aging to particle microphysical properties at emission
… nuclei activity. Understanding these aging processes is essential in assessing black carbon’s direct and indirect climate forcing. The initial black carbon becomes a complex distribution of distinct multi-component particles, which is not adequately represented by conventional aerosol …
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Accelerated Alkali-Silica Reaction and Corrosion of Reinforcing Steel in Concrete: Application on Dry Casks
… failure of the structure. This process is called aging. Two of the main aging mechanisms in reinforced concrete structures are corrosion and alkali-silica reaction (ASR). These two processes occur very slowly and to assess them in a short period of time, they need to be accelerated. Furthermore, …
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Electromagnetic fault analysis for high specific power permanent magnet synchronous machine
… Secondly, this thesis discusses the insulation aging to determine the longevity of the design. Various aging models therefore will be introduced to provide an analytical basis to project the insulation lifetime on real applications. A preliminary aging experimental setup is presented, along with …
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Aging of polymeric composites : a literature review
… been, thus far, discovered as to the effects of aging on polymeric composites. Special emphasis was placed on composites with vinyl ester as the matrix reinforced with glass or carbon fibers. Moisture exposure, thermal conditioning, and cyclic loading were the aging mechanisms used to mimic …
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Innate Lymphoid Cell Characterization and Ilc2S In Neuroinflammation In Aging and Sex Differences
<p>Aging affects immunologic responses by a global immune system suppression, including dysregulation of cytokine mediators, leading to increased inflammation throughout all systems, termed inflammaging. However, understanding healthy aging mechanisms can bypass this effect. Inflammaging also leads …
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Cancer screening behaviors in older adults: Grounded theory
… cancer, cancer screening and normal changes of aging. Mechanisms to routinely include gerontology and geriatric oncology into nursing curriculums must also be addressed. Finally, society must mandate that the health and well-being of the nation's oldest citizens deserves priority research and …
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Carbon Nitride and Conjugated Polymer Composite Materials
… recombination is one of the dominant loss and aging mechanisms in bulk heterojunction organic solar cells. The trapping of photoexcited holes in the P3HT phase was found to contribute to the increased recombination rate. It was determined that interfacial recombination occurs at the P3HT/PCBM …
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Multiphase Aging of Atmospheric Biomass Burning Brown Carbon
… to increase. Oxidative and photochemical aging in the atmosphere, however, can change BrC’s light absorbing properties as well as its chemical composition. Significant uncertainties remain when estimating BrC’s impact on climate due to its chemical complexity and the range of atmospheric …
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Aging Study of Silver-exchanged Mordenite and Silver-functionalized Silica Aerogel in Dry Air, Humid Air, No and No2
… (Ag0-aerogel) used in this study. However, the aging impact of off-gas streams on the adsorbents is one of major issues in the removal of radioactive iodine vapor during off-gas treatment. Previous studies have shown the remarkable performances of the Ag0Z and Ag0-aerogel for iodine adsorption, …
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Hygroscopic growth and cloud condensation nuclei activity of fresh and chemically-aged biomass-pyrolyzed organic aerosol
… but also because of transformations (aging) they undergo in the atmosphere upon exposure to reactive species (e.g., NH3 and O3). This study presents results of bench-scale experiments on biomass pyrolysis organic carbon (OC) particles to determine its hygroscopic growth at …
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Development of the small punch test platform to evaluate the embrittlement of power plant materials
… their own, they are not adequate to account for aging power plants that have been in service for more than half of their originally designed lifespans, since failures have been experienced due to in-service aging mechanisms (i.e. temper embrittlement, creep, etc.) and poor engineering and …
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Transient boiler heat exchanger thermal behaviour analysis
… that were built in the past four decades are aging. The main aging mechanisms are creep and thermal fatigue. Creep results from the high temperatures at which the components operate. Thermal fatigue is due to thermal stresses and these stresses result from temperature gradients within the …
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Model development and validation of bituminous-based crack sealants
… to evaluate the short-term and long-term aging effects of hot-poured crack sealants through a differential aging test. Rheological and mechanical properties of sealants at different aging stages were monitored to characterize the aging effects. Laboratory aging of sealants was studied …
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Synergistic Environmental Aging of Glass Reinforced Polymer Composites
… composites were examined and a novel synergistic aging model was proposed in this study. Six GRPs based on glass fibers with four different polymer resins and six pure polymer thermoplastic resins were exposed either individually or in combination to ultraviolet (UV) radiation, water condensation …