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 26 for “"Diffusion Properties"”.
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Effect of cross-linking on the diffusion of water, ions and small molecules in hydrogels
Understanding the diffusion of small molecules in hydrogel system is of major importance in a variety of applications including drug delivery systems, tissue engineering and contact lens. Cross-linking density of hydrogels has been commonly used to tune key parameters like mesh size and molecular …
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Chemical analysis of polymer blends via synchrotron X-ray tomography
Material properties of industrial polymer blends are of great importance. X-ray tomography has been used to obtain spatial chemical information about various polymer blends. The spatial images are acquired with synchrotron X-ray tomography because of its rapidity, good spatial resolution, large …
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Aromatic hydroxylations over titanium-substituted crystalline silicates
… of the reaction kinetics and the adsorption and diffusion properties of reactants and products in the various catalysts using different solvents. The role of shape selectivity inside the micropores of the solids and the reaction at their external surface was also examined.
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Radiation enhanced diffusion of neodymium in single crystal thin film UO2
Radiation-enhanced diffusion (RED) of a Nd buried tracer layer in UO2 thin films was measured with Secondary Ion Mass Spectrometry (SIMS). Samples were irradiated with 1.8 MeV Kr+ over a temperature range from 400 to 800 C. RED in UO2 was found to be in the recombination limited regime. Dose rate …
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Cerebral white matter analysis using diffusion imaging
… whole-brain tractography segmentation problem. Diffusion magnetic resonance imaging can be used to create a representation of white matter tracts in the brain via a process called tractography. Whole brain tractography outputs thousands of trajectories that each approximate a white matter fiber …
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Diffusivity of drug actives in transdermal drug delivery (TDD)
… trials computational estimation of the drug's diffusion properties with respect to the polymer matrix and skin will provide for safer clinical trials, with testing dosages that are closer to the therapeutic drug concentration in the blood.
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Complex fluid lubrication mechanics of polyacrylamide surfaces
… material property, which helps to connect the properties to lubricating ability. While most hydrogel lubrication studies assume a steady state of sliding, a recent study discovered that under constant sliding, the friction of a hydrogel interface was influenced strongly by the history of …
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Understanding molecular scale effects during photoresist processing
… efficiency of photoresist exposure, the reaction-diffusion properties of exposure photoproducts, and the complex dissolution behavior of phenolic homopolymers and copolymers in aqueous base. A dynamic Monte Carlo simulation has been developed to test the experimentally derived models and further …
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First principles study of structure and lithium storage in inorganic nanotubes
… using atomistic calculations to predict nanotube properties. A multi-walled nanotube with a circular cross section will have either a mostly incoherent interface or a large amount of tensile strain to accommodate a coherent interface, but a polygonal cross section could result in a coherent …
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Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.
… to improve their thermal stability, electrical properties, and reduce dopant penetration. Because CMOS processing requires high temperature anneals (up to 1050 °C), it is important to understand the diffusion properties of any metal associated with the gate dielectric in silicon at these …
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Development of a simulation model for drying deformation in radiata pine boards
… element method. All drying conditions and the diffusion properties of radiate pine were simulated. Typical heat and mass transport phenomena, including temperature profile, moisture profile, thermal gradient, mass flux and moisture gradient in clearwood and knot-containing boards, were …
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Fundamental Importance of Fillers, Cure Condition, and Crosslink Density on Model Epoxy Properties
… silane treated amorphous fumed silica fillers on properties of the cured epoxy was examined in the first part of the study. Silica particles were treated with 3- aminopropyldiethoxymethylsilane (APDS) and 3-aminopropyltriethoxysilane (APTS) coupling agents. The filler and coupling agents decreased …
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Development of correction algorithm for pulsed terahertz computed tomography (THz-CT)
… structure of natural cork stoppers dominates the diffusion of gasses and liquids through the cork. By using THz computed tomography, one can recreate a 3D image of the sample's internal structure which could then be used to predict non-destructively the diffusion properties of the cork. However, …
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Εντοπισμός και γραμμική απόκριση ηλεκτρονίων στο άτακτο πλέγμα
The study of the localization, and transport properties in disordered systems is considered to be a hard theoretical problem. The localization problem has been given considerable attention in the literature while the transport one has rarely been studied in depth, because it constitutes an even …
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The Effects of Structure, Humidity and Aging on the Mechanical Properties of Polymeric Ionomers for Fuel Cell Applications
… It was determined that the majority of the properties of these membranes were controlled by the formation and growth of the ionic clusters that were the direct result of the ionic nature of these materials. In the process of this study, the properties of Nafion® and sulfonated Dais® polymers …
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Advanced Fabrication of Interactive Stained Glass for Designing Smart Interior Objects
… the interactivity, conductivity, and light diffusion properties across multiple modified stained glass panels. Experimentation was followed by Study I, where we conducted a series of group workshops with electronics and art practitioners (11 in total). Findings for Study I indicate that …
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High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity
<p>Diffusion tensor imaging (DTI) has emerged as a unique method to characterize brain tissue microstructure non-invasively. DTI typically provides the ability to study white matter structure with a standard voxel resolution of 8μL over imaging field-of-views of the extent of the human brain. As …
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Ferritin: Mechanistic Studies and Electron Transfer Properties
… ET through the protein shell. Finally, the diffusion properties of ferritin pores are examined toward iron (2+ and 3+) and anion transfer. Iron transfer is studied by the formation of Prussian blue ([FeIIFeIII(CN)6]-) encapsulated in the ferritin cavity, and is consistent with a …
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Heart failure and associated structural and functional remodeling: assessment employing various magnetic resonance imaging methodologies.
… designed pulse sequences which are sensitive to diffusion. In this specialized imaging method, known as diffusion tensor magnetic resonance imaging (DTMRI), myofiber orientation can be probed in high resolution and this technique has been successfully utilized to study the helical arrangement of …
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Simulations of silicon-graphene anodes using machine-learning-based interatomic potentials
… clustering, coordination states, and lithium diffusion properties. In bulk systems, simulations revealed crucial insights into the structural and kinetic mechanisms during lithiation and delithiation, with the Si-Li-GAP22-P1 potential accurately capturing the aggregation and fragmentation of …
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