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 73 for “"morphological evolution"”.
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Survey Techniques to Examine Morphological Evolution of Coastal Regions
… lidar mounted on the dune. The observed morphological events include the destruction and formation of a cusp field during which there was 1.4 m of erosion and accretion associated with bays and horns, and the formation over 7 days of a ~1-m high ridge and runnel system. The GPS-equipped …
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The phylogeny, morphological evolution and biogeography of the Gaultherieae (Ericaceae).
… group are monophyletic. Optimization of morphological characters emphasized in classifications of the Gaultherieae onto the molecular phylogeny revealed that (1) fleshy calyces evolved either early in the lineage leading to the wintergreen group or later in two separate clades; (2) …
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Nanoscale modeling of materials: post deposition morphological evolution of fcc metal surfaces
… of several issues related to post deposition morphological evolution of fcc metal surfaces. These studies were carried out by probing the energetics and the dynamics of underlying atomistic mechanisms responsible for surface diffusion. An important aspect is the determination of relative …
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DESIGN AND SYNTHESIS OF STAINLESS-STEEL NANOPARTICLES: OXIDATION BEHAVIOR AND MORPHOLOGICAL EVOLUTION
… NPs, and Fe/Ni core/shell NPs. I performed the morphological analysis of these NPs via transmission electron microscopes (TEM/HRTEM), structural characterization via X-ray diffraction (XRD), surface analysis via X-ray photoelectron spectroscopy (XPS), thermal property analysis via …
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Morphological Evolution During Molecular Beam Epitaxy of Germanium/germanium(001) and Silicon/germanium(111)
I have investigated the evolution of islands during the heteroepitaxy of Si on Ge(111). This study involves a systematic investigation of the island nucleation kinetics, morphology and microstructure for various thicknesses and deposition temperatures. The islands formed are predominantly …
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Stability and Morphological Evolution in Polymer/Nanoparticle Bilayers and Blends Confined to Thin Film Geometries
… systems. This dissertation provides studies on morphological evolution driven by phase separation and/or dewetting in model polymer/nanoparticle thin film bilayers and blends at elevated temperatures. Morphological evolution in dewetting bilayers of poly(t-butyl acrylate) (PtBA) or polystyrene …
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How environments shape ornament morphological evolution: bringing perspective to a century of inconsistent sexual allometry analysis
… theory – that female preferences drive the evolution of disproportionately larger male sexual structures – are yet to be formally tested in an experimental setting. I designed such an experiment using realistic models of a terrestrial Blenniid fish species from Chapter two. Its findings …
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The Phylogeny of Basal Coelurosaurian Theropods (Archosauria: Dinosauria) and Patterns of Morphological Evolution during the Dinosaur-Bird Transition
… Mesozoic taxa. Carnivorous theropods are the evolutionary ancestors of birds, and the evolutionary transition between theropods and birds is a textbook example of a major evolutionary transformation in the history of life. Despite a flurry of research on early birds and their dinosaurian …
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Systematics, biogeography and morphological evolution in Entosthodon Schwägr. (Bryopsida, Funariaceae) with a revision of the genus in Africa
… also maintained. Because of a lack of diagnostic morphological taxonomic characters this new classification is based largely on the molecular circumscription of clades. Nonetheless, particular character combinations do largely characterise most of these genera, albeit that frequent reversals …
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Nanostructural, Surface Morphological Evolution, and Physical Properties of Sodium Chloride-Structure Titanium Nitride and Titanium Cerium Nitride Layers as a Function of Composition
I use a combination of alloying and low-energy ion irradiation during film growth to controllably manipulate the nanostructure of TiN-based layers. Ti0.8Ce0.2N films are grown on oxidized Si(001) at 350°C using UHV reactive magnetron sputter deposition in pure N2. The N+2 to metal ratio …
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An integrated framework for coastal flood Early Warning and morphological evolution analysis [Un framework integrato per l’allerta precoce delle inondazioni costiere e l’analisi dell’evoluzione morfologica]
Le zone costiere sono sempre più soggette alle pressioni combinate dell’innalzamento del livello del mare, dell’intensificazione delle mareggiate e delle alterazioni antropiche della linea di riva. Questi fattori interagenti contribuiscono a un aumento della frequenza e della severità delle …
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Solid-state dewetting of continuous and patterned single crystal Ni thin films
… understanding the underlying physics of regular morphological evolution during dewetting of single crystal films, and guiding the phenomenon to reproducibly produce regular structures with various morphologies. We used single crystal Ni films grown on single crystal MgO substrates as a model …
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Ontogeny and evolutionary morphology of the skeleton in frogs
… proven insightful in exploring questions of morphological evolution. Here, two projects illuminate the relationship between ontogeny and the evolution of skeletal morphology in frogs. In the first part of this dissertation, I examine the evolution of skull development in pipoid frogs, a group …
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Evolution of Floral Morphology and Symmetry in the Miconieae (Melastomataceae)
<p>Analyses of evolution of floral morphology and symmetry broaden our understanding of the drivers of angiosperm diversification. Integrated within a flower, labile floral characters produce different phenotypes that promote variable interactions with pollinators. Thus, investigation of floral …
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Phase field model for precipitates in crystals
… oxygen precipitate in CZ silicon and its morphological evolution by means of phase-field method, and to gain the insight of the morphological transition of the oxygen precipitate and the distribution of oxygen, vacancy, and self-interstitial around the single oxygen precipitate. The …
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The social environment and the evolution of morphology in the burying beetle, <em>Nicrophorus vespilloides</em>
… how the social environment can influence morphological evolution, using a combination of observation and experiments on burying beetles *Nicrophorus vespilloides*. This species exhibits a set of social interactions at all life stages that centre around the acquisition and use of small …
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Mechanisms and Reaction Paths for Surface Roughening and Epitaxial Breakdown During Molecular Beam Epitaxy: Fundamental Limits
… strained films. Sn mediates surface morphological evolution through two competing pathways. With x ≲ 0.02, the dominant effect is a Sn-induced smoothening of the surface. At higher x there is a change in Ge1-xSn x(001) growth kinetics due to a rapid increase in compressive …
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Field observations and numerical model simulations of a migrating inlet system
… importance of wave and tidal current forcings on morphological evolution at timescales of days to months.
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Field observations and numerical model simulations of a migrating inlet system
… importance of wave and tidal current forcings on morphological evolution at timescales of days to months.
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