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 14 of 14 for “"gel layer"”.
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Predictive Modeling of Diffusional Processes Within the Hydrated Layer of Vitrified Nuclear Waste Forms
… a structurally altered, highly hydrated layer forms. The distribution of the glass constituents within this layer has been investigated through development of mathematical models representing the fundamental mechanisms that describe the formation of those gel layers. These mechanisms …
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A viscoelastic model for the response of a step change in velocity of the human otolith organs
… rigid otoconial plate attached to the skull by a gel layer, surrounded by a viscous endolymph fluid. The gel layer is considered to be a viscoelastic solid, and modeled as a simple Kelvin element. The governing differential equations are derived and nondimensionalized, yielding three …
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Bi-layered viscoelastic model for a step change in velocity and a constant acceleration stimulus for the human otolith organs
… fluid in contact with a rigid otoconial layer that is attached to the skull by a viscoelastic gel layer. However, in this model the gel layer is considered as a bi-layered viscoelastic solid and is modeled as a simple Kelvin-Voigt material. The governing differential equations of motion …
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Packaging and Secretion of Airway Mucins
… airways of the lungs, the mobile mucus gel layer sits on top of the airway epithelium, and through ciliary beating it is propelled up the trachea into the pharynx where it is swallowed and cleared. This gel layer is composed of secreted mucins that become hydrated once reaching the …
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Large displacement fast conducting polymer actuators
… configuring the conducting polymer film in a trilayer configuration with two conducting polymer films sandwiching an electrolyte gel layer. This thesis focuses on the development of conducting polymer bending actuators in air. There is a strong correlation found between applied voltage, …
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Oral Drug Delivery -- Molecular Design and Transport Modeling
… involves swelling of the polymer, forming a gel layer and diffusion of drug through the gel layer into the body. The polymer is mainly responsible for controlling the release rate (of the drug from the tablet), which would lead to a desired therapeutic effect on the body. In our research, we …
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Shape formation via elastic instabilities
… and the gravitational fingering of a soft gel layer. Using higher order perturbation theory, I find, in both cases, that patterns of hexagonal dents are favoured, and I present a symmetry argument that hexagonal patterns are generic. Finally, I present a technique to manipulate the patterns …
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Investigation of liquid sodium alginates as mucoadhesive bandages coating the oesophageal mucosa and protecting it from gastric reflux
… in acid and pepsin diffusion by alginate gel layer was demonstrated in this project, indicating that alginate has great potential to protect against damage caused by acidic reflux. A novel method was introduced using an independent score system to assess the protection of oesophageal …
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Effects of Polymers on Carbamazepine cocrystals phase transformation and release profiles
… Dihydrate (CBZ DH) in solution or in the gel layer of the matrix, as opposed to its ability to inhibit CBZ Form III (CBZ III) phase transition to CBZ DH. The selection of different coformers of SAC and CIN can affect the stability of CBZ in solution, resulting in significant differences in …
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Investigating the effects of magnesium on the structure and durability of radioactive waste glasses by solid-state NMR
… from early stages when the supposedly protective gel layer is forming and growing has not been studied. Solid-state NMR is extensively applied to characterise the altered glass surface in this thesis for its power in providing atomic-level structural insights with amorphous materials being …
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Self-assembled Precipitation Membranes and the Implications for Natural Sciences
… through the precipitate and through an adjacent gel layer. Results from our theory are in excellent agreement with the measurements and show that a wavy precipitate surface can enhance the transverse transport of ions by extracting energy from a longitudinal flow field. In the second study, the …
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Thin layer chromatography-matrix assisted laser desorption ionisation-mass spectrometry of pharmaceutical compounds.
Thin-layer chromatography (TLC) is of great importance for the pharmaceutical industry as a simple, quick, and low cost analytical method. Considerable effort has been made over the past decades to combine the simplicity of TLC with the selectivity and sensitivity of mass spectrometry (MS) …
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EVALUATION OF HYDROLYTIC ENZYMES IN THE DESIGN OF ORAL DRUG DELIVERY SYSTEMS
… of cellulase led to a progressively weaker gel, i.e. more permeable and less viscous over time, with increasing enzyme amounts. Mathematical modeling of release profiles and fronts position over time confirmed that the enzyme is able to bring about a progressive reduction of the gel layer …
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Performance of geopolymer concrete subjected to mineral acid corrosion and related to microbially-induced corrosion (MIC) of concrete in sewers
… between the static and dynamic test is largely attributed to the formation of alumina gel, an acid corrosion product of CAC hardened paste, which envelopes the concrete specimen and reduces the rate of surface corrosion in the static HCl test. However, under v the dynamic HCl test, the gel …