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 15 of 15 for “"surface phenomena"”.
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Understanding surface and sub-surface phenomena in nickel-based superalloy castings
… results in scrapped components. Internal surface melting was found on intermediate pressure turbine blades following high-temperature heat-treatment; it consists of a layer enriched in aluminium and tantalum on the surface of the internal cooling passage. The discovery led to a systematic …
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A new approach to the study of surface phenomena, measurements of diffusion rates, intermolecular distances and electronic properties of CO chemisorbed on supported platinum catalysts by nuclear magnetic resonance
… of CO layers chemisorbed on single crystal surfaces. He has observed the narrowing of the NMR line and the effects of motion on transverse relaxation from 300 K to 600 K from which he deduces diffusion energies of 13 and 16 plus/minus 2 kcal/mol, in agreement with measurements of R. Lewis …
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A New Approach to the Study of Surface Phenomena: Measurements of Diffusion Rates, Intermolecular Distances and Electronic Properties of Carbon Monoxide Chemisorbed on Supported Platinum Catalysts by Nuclear Magnetic Resonance
The author has applied magnetic resonance to study the chemisorption of CO on supported platinum particles. The particles are 10 to 50 (ANGSTROM) in diameter, supported on alumina. CO is 90% enriched with ('13)CO. NMR data were taken from 4 K to 600 K.
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Surface embedded green function method applied to Ag(111).
… self-consistent calculations utilizing the Surface Embedded Green Function (SEGF) method have been performed on the Ag(111) surface. Analysis of the surface energetics reveal an energy minimum in the low temperature limit at an outerlayer contraction of 0.5% which agrees well with low energy …
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Strain at surface and interface steps
… a powerful tool for the study of interface and surface phenomena. Its sensitivity to lattice plane orientation allows for the imaging of crystal strain. In this thesis, I will present a unique method for quantitatively measuring crystal strain using TEM. This method relies on the quantitative …
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An evaluation of unsaturated flow models in an arid climate
… predicting soil-moisture movement and variable surface phenomena for bare soil conditions in the and vadose zone. The development of calibrated models along with the atmospheric and soil data collected at the site provide useful information for predicting future site performance at the RWMS.
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Fundamentals and new applications of electrochemical promotion in catalysis
… of ions from the solid electrolyte to the surface of the catalytically active metal film with which it is in contact. In short, controlling the potential difference of the electrochemical cell controls the coverage of promoters on the catalyst while a catalytic reaction is taken place. …
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Design and manufacturing of PDMS micro structures with dynamic inclination angle
… techniques enable new understanding of surface phenomena such as liquid wetting and dry adhesion. This understanding led to a surge of design and fabrication of novel non- and directional wetting, self-cleaning, anti-biofouling and energy efficient surface textures. This work focuses on …
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Etude de la flottabilité de la malachite à l'aide de l'amylxanthate de potassium et d'un acide gras. (Cas d'étude: Flottation du minerai oxydé de Kamfundwa au Katanga en RDC)
… It focuses from one side on aspects related to surface phenomena and collector attachment mechanisms and on other side on improvement of processing flowsheet at industrial scale. The first part of our results concerns theoretical aspects related to floatability of malachite. Due to their surface …
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Surface:plasma interactions in GaAs subjected to capacitively coupled RF plasmas
Surface compositional changes in GaAs due to RF plasmas of different gases have been investigated by XPS and etch rates were measured using AFM. Angular Resolved XPS (ARXPS) was also employed for depth analysis of the composition of the surface layers. An important role in this study was …
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Investigations of Bacteria Viability on Surfaces Using ω-functionalized Alkanethiol Self-Assembled Monolayers
… relationship between covalently-bound biocidal surface molecules and bacteria is not. While a number of antibacterial surfaces have been reported, detailed analysis of the molecular scale surface structure has not been performed. The lack of structural knowledge makes it difficult to determine …
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Dynamics of filaments, flares and coronal mass ejections (CMEs)
… the connection between the dynamics of solar surface phenomena such as filament eruptions, flares, the coronal mass ejections (CMEs), the core of so-called solar activity, and the properties of the associated magnetic field for the development of forecasts of solar activity and space weather. …
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Study of Phase Behaviours of Reservoir Fluids with Consideration of Adsorption and Capillary Pressure
… the fluid molecules keep close to the surface of the porous media and certain interactions exist between the fluids and reservoir media. Due to the fine particles, small pore radii, complicated pore structures, and large specific surfaces of the porous media, there always exists a large …
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Multiscale Modeling, Reformulation, and Efficient Simulation of Lithium-Ion Batteries
… batteries is examined. As the physical phenomena which govern battery performance are described using several nonlinear partial differential equations, simulating battery models can quickly become computationally expensive. Thus, much of this work focuses on reformulating the battery …