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 62 for “"accelerated aging"”.
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Investigating markers of accelerated aging in patients with Treatment Resistant Depression
… This evidence supported the hypothesis that accelerated biological aging might be a feature of mood disorders, but findings have been so far controversial, and less is known about the role and clinical utility of aging markers in the management of treatment response. Pharmacological …
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The Gut Microbiome as a Novel Approach for Reversing Long-Term Inflammation and Accelerated Aging Across the Lifespan
… is recognized but its ramifications, including accelerated aging, are poorly understood. As this coincides with critical stages of brain development, interventions started months or years post-injury may still improve survivors’ quality of life. One promising intervention is to manipulate the …
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Developing an accelerated aging system for gasoline particulate filters and an evaluation test for effects on engine performance
… effecting engine performance. The effect of aging as a result of ash accumulation is examined over the full lifetime of gasoline particulate filters, using a novel accelerated aging system. This system utilizes a gasoline combustion chamber into which lubricating oil is injected simulating …
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Quantifying the Effects of Aging on the Mechanical Properties of Medical Grade Polycarbonate and UV Cured Adhesives
… of polymers, little is known about their actual aging characteristics. By characterizing the effects of aging, storage environment, and sterilization on medical grade polycarbonate/adhesive system properties, more accurate failure predictions can be made. In this thesis, efforts to better …
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Manufacturability of lab on chip devices : reagent-filled reservoirs bonding process and its effect on reagents flow pattern
… were the heat sealing parameters (x, y, z) and accelerated aging and the dependent variables were bond strength and the reagent flow pattern. Experiments showed that optimal Heat Sealing parameters are: parameter x = 4.5, parameter y = 110 and parameter z = 1.5. At the optimal settings of …
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Understanding the Role of N-Methylolacrylamide (Nma) Distribution in Poly(Vinyl Acetate) Latex Adhesives
… Specimens were analyzed after exposure to accelerated aging treatments. Latex 2 and Latex 3 exhibited very similar results, despite having very different NMA distributions. All three latices showed good durability related performance. In Latex 2 and Latex 3, the critical strain energy …
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Photoinduced Optical Integrated Circuits and Bulk Photonic Devices in Chalcogenide Glasses
… Preferred regimes of operation are defined, and accelerated aging studies are used to predict device lifetimes.
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Design and optimization of a play-free rotary magneto-rheological fluid brake for enhanced performance and durability
… of various material compositions under accelerated aging conditions. The research focuses on the impact of an involute spline profile and the incorporation of ferromagnetic steel on torque performance. Results demonstrate that the involute profile significantly reduces mechanical play, …
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Exploring the longevity of dry Craterostigma wilmsii (homoiochlorophyllous) and Xerophyta humilis (poikolichlorophyllous) under simulated field conditions
… field, but also included those that resemble the accelerated aging conditions used in seed studies.
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On variability and reliability of poly-Si thin-film transistors
… To effectively predict circuit lifetime, accelerated aging (i.e. elevated voltage and temperature) is commonly applied in circuit-level reliability tests, such as constant voltage stress (CVS) and ramp voltage stress (RVS) tests. However, due to the accelerated aging, shifting of dominant …
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A Comparison of Several Parameters of Aging in Drosophila Melanogaster Under Normal and High Oxygen Tension
… high oxygen tension, might provide a model for accelerated aging, at least in regard to lipid peroxidation damage. To test this proposal, adult male Oregon R Drosophila melanogaster were exposed to an atmosphere of 1:1 oxygen-nitrogen. A number of possible effects of excess oxygen and …
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Metabolomics of Mammalian and Cellular Models of Aging
<p>Aging is often associated with impaired cognition and a progressive loss of organ function over time accompanied by an increased susceptibility for many disorders, including Alzheimer's disease (AD), Parkinson's disease (PD), heart disease, osteoporosis, type II diabetes, and many forms of …
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Repair of damaged end regions of prestressed concrete girders using fiber reinforced polymer composite materials
… and NSM bar concrete specimens are performed. An accelerated aging scheme consisting of freeze/thaw cycling in the presence of a deicing salt solution is implemented to determine the effect of long-term environmental exposure on the FRP/concrete interface. In the next phase, three-point bending …
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Effects of ARVs and HIV on mitochondrial function and immune activation in monocyte derived macrophages in vitro
… virally suppressed individuals drive a form of accelerated aging and comorbidity. Macrophage activation drives persistent inflammation but the molecular mechanisms remain poorly understood. Uninfected and HIV-infected MDMs were treated with ARVs: TFV, 3TC, and EFV, and alterations in cell …
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Manufacture and rehabilitation of guard-rail posts using composites for superior performance
… of the proposed posts were subjected to 6-cycle accelerated aging and freeze-thaw chemical aging (in acidic, alkaline, water and salt water solutions). The retention in mechanical properties was measured using flexure tests and DMTA. The performance in terms of modulus and rigidity was reduced …
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Étude de l'impact de l'humidité et de l'alcalinité sur des armatures de polymères renforcés de fibres (PRF)
… into two projects. The first one is the study of accelerated aging of glass fibers reinforced polymer (GFRP) rebars, of different diameters, conditioned in a moist environment. The second one concerns the behavior of GFRP and basalt fibers reinforced polymer (BFRP) rebars, of same diameter, …
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The design and performance of a low-cost inflatable wheelchair seat cushion
… were conducted on the Loop prototype, including accelerated aging, interface pressure mapping, hysteresis, impact damping, loaded contour depth, envelopment, 10% force deflection, horizontal stiffness, and sliding resistance. An additional test was conducted to evaluate the cushion's pressure …
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