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 41 for “"accelerated degradation"”.
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Statistical Predictions Based on Accelerated Degradation Data and Spatial Count Data
… Chapters 2 and 3 investigate the photodegradation of an organic coating, which is mainly caused by ultraviolet (UV) radiation but also affected by environmental factors, including temperature and humidity. In Chapter 2, we identify a physically motivated nonlinear mixed-effects model, …
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Statistical Methods for Multivariate Functional Data Clustering, Recurrent Event Prediction, and Accelerated Degradation Data Analysis
… introduces thermal index (TI) estimation in accelerated destructive degradation test (ADDT) data, in which an R package is developed. All three projects are related to and can be used to solve certain reliability problems. Specifically, in Chapter 2, we introduce a clustering method for …
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Conducting polymer actuators : temperature effects
… the polymer. However, these temperatures cause accelerated degradation due to the time-temperature correlation common to viscoelastic polymers. Actuation at these temperatures can decrease cycle life by as much as 20x. Excessive heating without actuation can also result in poor actuator …
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The degradation of gel-spun poly(beta-hydroxybutyrate) fibrous matrix
… quantitative investigations of the structure and degradation of a previously unstudied, novel, fibrous form of PHB, were completed. This gel-spun PHB fibrous matrix, PHB(FM), which has a similar appearance to cotton wool, possesses a relatively complex structure which combines a large volume with …
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A multistage-constant-current, temperature-controlled, health-conscious fast charging algorithm for lithium-ion batteries
… due to excessive temperature rise resulting in accelerated degradation of the battery chemistry. Especially in subzero conditions, the chemical reactions are much slower, resulting in increased internal impedance. This leads to a higher rate of temperature rise in battery temperature and …
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Contributions to planning and analysis of accelerated testing
… prevailing interest in saving time and expense,Accelerated Life Testing (ALT) and/or Accelerated Degradation Testing (ADT) are becoming an integral part of many programs for improving productsa??quality and reliability.However,appropriate analysis of ALT/ADT data and planning of ALT/ADT …
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In vitro inflammatory response evaluation of pre-degraded bioresorbable polymers
… these results. Due to the long polymer degradation times, in vitro tests carried out at physiological temperature, 37°C, tend to assess the short-term biocompatibility of these materials, with the long-term biocompatibility assessed using in vivo trials. The aim of this thesis is to …
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Controlling the alignment and degradation of 3D printed poly-L-lactic acid for redesigned coronary stents
… PLA stents have suffered from uncontrolled degradation and increased risk of late-stage thrombosis. Internal differences in microstructure, arising from the manufacturing and implantation process, resulted in an asymmetric degradation profile. If, however, the effect of microstructure on …
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Charge Scheduling of Plug-in Hybrid Electric Vehicles (PHEVs) for Minimized Li-ion Battery Degradation
… overuse of V2G for profit will result in the accelerated degradation of the Li-ion batteries of the PHEVs. Thus, it is necessary to have charging schedules that would meet the requirements of all parties. Swarm intelligence techniques are used in this thesis in order to devise strategies that …
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Critical Evaluation of Techniques for the Identification of Archaeological Bast Fibres: Flax, Hemp and Nettle
… features, was evaluated under a temperature accelerated degradation 48week trial with eight fibre types from three deposition soils Post deposition, surviving fibres were subjected to evaluation of changes in MFA and Ct. An additional check on the diagnostic efficacy was conducted within a …
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Integrated environmental degradation model for Fe-Ni-Cr alloys in irradiated aqueous solutions
… and significant tensile stress result in accelerated degradation, including stress corrosion cracking (SCC), and hydrogen embrittlement. The EAC model is based on first principles electrochemistry and physical metallurgy. The effect of neutron and gamma radiation dose is included so that …
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SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
… temperature fuel cells. Electrochemical testing, accelerated degradation studies as well as advanced characterisation techniques were used to clarify the structure-property relationships between catalyst morphology, metal-support interaction, ORR activity and surface adsorption onto the Pt …
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Accelerated thermal degradation testing of GAN HEMTs under high-temperature stress
… advantages, GaN HEMTs are prone to performance degradation when exposed to elevated temperatures and electrical stress over long durations. This study aims to investigate the degradation behavior of commercial EPC90122 GaN HEMT devices under controlled high-temperature operating conditions. …
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Characterisation and refinement of properties of glass fibre reinforced polyester polymer concrete for use in manhole components
… the effect of different reinforcing materials. Accelerated degradation tests were then conducted to establish the materials resistance to UV radiation, acids, alkalis, and various solvents. Different resins were evaluated, and experiments were conducted using graded aggregates, in an attempt to …
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Investigation of Secondary Phases Including Ionic Liquids for Biphasic Bioreactors Treating Hydrophobic VOCs
… are regulated. One such control method is via biodegradation in a biofilter and other similar reactors. Many hydrophobic VOCs, however, are difficult to degrade in such devices. Biphasic bioreactors are designed to remove and treat hydrophobic compounds from waste gas streams. In addition to the …
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Ionic liquids as additives for biodegradable polyactic acid
… for their effects on its hydrolytic and thermal degradation. Both ILs at 5wt% were well dispersible and partly miscible with PLA as evidenced by scanning electron microscopy/energy dispersive x-ray scattering, SEMIEDX, and glass transition temperature, T_g, characterization, as well as from …
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Chemically-bonded enamel-coated steel pipelines for corrosion protection and flow efficiency
… debonding at the coating-steel interface nor accelerated degradation process of the coating. The more negative the applied CP potential, the more susceptible to SCC the enamel-coated stee"--Abstract, page iii.
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Climate Change and its Potential Impacts on Construction in Ireland: The Argument for Mitigation and Adaptation
… will be required to monitor for signs of accelerated degradation under changed climatic conditions. New builds should be constructed using the modifications recommended in this research, and where possible avoid locations highlighted as being likely to experience more severe climatic …
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DEVELOPMENT OF SYNTHETIC POLYMERS FOR BONE TISSUE ENGINEERING: ENGINEERING THE DEGRADATION RATE
… water ingress and therefore an increased rate of degradation relative to PPF. Results from In vitro accelerated degradation studies confirmed our hypothesis. An in vitro cytocompatibility study with the murine cell line MC3T3-E1 demonstrated that there were no cytotoxic components that leached …
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