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 17 of 17 for “"degradation behaviour"”.
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Degradation behaviour of the mechanical properties of bovine cortical bone
… data for a nuanced understanding of material behaviour while mitigating computational expense associated with full bone simulations. To address these gaps, this thesis develops solutions that enhance the accuracy and reliability of the mechanical testing of bone. A custom subpress has been …
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Hot carrier degradation in deep submicron n-MOS technologies
… aggressive scaling of MOS devices hot carrier degradation continues to be a major reliability concern. The LDD technologies, which have been used to minimise the hot carrier damage in MOS devices, suffer from the spacer damage causing the drain series resistance degradation, along with the …
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Charakterisierung perowskitischer Hochtemperaturmembranen zur Sauerstoffbereitstellung für fossil gefeuerte Kraftwerksprozesse
… work is a better understanding of the material behaviour. Furthermore, on the basis of the results it should be possible to draw conclusions concerning the suitability of the material for application in oxyfuel power plant processes. Therefor, the influence of the chemical composition (doping …
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A phenomenological mathematical modelling framework for the degradation of bioresorbable composites
Understanding, and ultimately, predicting the degradation of bioresorbable composites made of biodegradable polyesters and calcium-based ceramics is paramount in order to fully unlock the potential of these materials, which are heavily used in orthopaedic applications and also being considered for …
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Freisetzungsverhalten von unterschiedlich hydrophil/hydrophoben Modellsubstanzen aus Poly-(D,L-lactid)- und Poly-(D,L-lactid)-co-PEO-co-poly-(D,L-lactid)-Mikrosphären und pharmazeutische Anwendungen
… the scope of this dissertation, the release behaviour of different model substances and drugs from degradable poly-(D,L-lactide) (PDLLA) and poly-(D,L-lactide)-co-PEO-co-poly-(D,L-lactide) (ABA) microspheres as well as poly-(D,L-lactide-co-TMC)(90:10) nanospheres in PBS-buffer are …
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Analysis of RNA stability in forensic specimens
… This research has characterised the post-mortem degradation behaviour of tissue RNA in an animal model, the laboratory mouse; with the aim of identifying a post-mortem interval during which gene expression analysis provides informative and reliable results. It was extremely encouraging that over …
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Preparazione e caratterizzazione di due sistemi carrier: beads a base di chitosano e chitosano/alginato; nanoparticelle di N-trimetilchitosano
… combined procedures reported above. The swelling degradation behaviour of the bead samples and drug release were investigated using four different medium solutions (PBS pH 7.4, HCl 0.1N pH 1, buffer pH 5). TMC with different degrees of quaternization were synthesized and characterized by 1 H- NMR …
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An experimental approach into the degradation of wind turbine blade coating systems due to rain and weathering
… leading edge erosion can lead to structural degradation, resulting in premature failure of the blade.This thesis looks to define a quantitative experimental methodology to assess and characterise erosion on wind turbine blades. Furthermore, this thesis goes on to include weathering as a …
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A study of the thermal degradation of flexible tdi-based polyurethane foams
… research project was, therefore, to study the degradation behaviour of toluene diisocyanate (TDI)-based polyurethane foams in order to determine the mechanisms which occur and the effect that various fire retardants have on the degradation mechanisms. The results have demonstrated that the …
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Thermal, oxidative and hydrolytic degradation studies of poly(ethylene naphthalate)
Degradation of PEN is a particular problem above its melt temperature and is generally inevitable during synthesis and processing as the material is subjected to high thermal and mechanical stress. Whilst the literature is replete with studies on the degradation of PET, PEN has received little …
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Design of a Validated Stability Indicating HPLC Method for the analysis of Patrin-2 (Lomeguatrib).
… cannot be stopped by neither MGMT nor MMR. The degradation behaviour of Patrin-2 was studied by subjecting it to various stress conditions. A validated stability indicating high-performance liquid chromatography method was established for the analysis of the drug in the presence of its various …
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Production and characterisation of bioresorbable polymers and polymer-glass composites for application in cardiac stents
… limited by poor mechanical properties and slow degradation. Materials with increased strength and stiffness are needed, to reduce the required stent strut size and elastic recoil, so that the risk of restenosis can be minimised. Long term complications such as strut fracture and late stent …
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Adaptive Simulation Modelling Using The Digital Twin Paradigm
… to predict the risk to the structure from degradation mechanisms such as corrosion and cracking. These predictive models are either physics-based, data-driven or hybrid based. The process of building these predictive models tends to involve processing some input parameters related to the …
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Integrated Workload Allocation and Condition-based Maintenance Threshold Optimisation
… labour routing. The intrinsic link between the degradation behaviour of and the workload allocated to an asset, however, has not been sufficiently studied. Consequently, the potential benefits of intervening in machine degradation, either in the context of a single asset or a fleet of assets, …
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Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites.
… morphological, rheological and thermo-mechanical behaviour of LDPE and PA6 nanocomposite materials. The thesis begins with a critical literature review, covering oil-based mud (OBM) waste treatments, polymer nanocomposites and their manufacturing, thermal degradation behaviour and mechanical …
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Pharmaceutical occurrence, distribution and degradation in rural wastewaters and surface waters in Scotland
… on pharmaceutical occurrence, distribution and degradation in rural wastewaters and surface waters in Scotland. The aim was carried out through: (i) comprehensive literature review; (ii) target compound selection; (iii) characterisation of hospital wastewater and its impact on pharmaceutical …
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DYNAMIC SURFACES FOR URINARY CATHETERS: THE EFFECT OF POLY (GLYCEROL SEBACATE CITRATE) COMPOSITION ON DEGRADATION, ENCRUSTATION RESISTANCE AND BACTERIAL RESPONSE
… The effects of citric acid concentration on the degradation characteristics, mechanical behaviour, hydrophilicity and encrustation resistance of bulk samples were investigated and the feasibility of coating a silicone catheter material with PGSC using oxygen plasma treatment was assessed. The …