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 199 for “"columnar"”.
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Columnar denitrification of a munitions waste
The removal of nitrate nitrogen from a munitions waste by means of bacterial reduction was investigated using packed anaerobic columns. The feasibility of using a munitions waste high in organic carbon (Water Dry Process Waste) as the organic carbon source was also investigated. Simultaneously the …
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Performance of Columnar Reinforced Ground during Seismic Excitation
… to study seismic performance of soil-cement columnar reinforcements in loose sandy profiles. Different constitutive models were investigated in order to find a model that can properly predict soil behavior during seismic excitations. These models included NorSand, Dafalias-Manzari, Plasticity …
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Building a columnar database on shared main memory-based storage
… feasible. This thesis describes building a columnar database on shared main memory-based storage. The thesis discusses the resulting architecture (Part I), the implications on query processing (Part II), and presents an evaluation of the resulting solution in terms of performance, …
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Crystal Structures of Helical Columnar pi-Conjugated Systems and Biodegradable Polyester
Crystal structures of helical columnar pi-conjugated systems, namely helicene-bisquinone and dendronized perylene bisimide derivative as well as of a biodegradable aliphatic polyester, namely poly-9-hydroxynonanoate, have been resolved by means of fibre X-ray diffraction. Enantiopure and racemic …
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Determinants of the structural niches of columnar cacti in the Southwest
I evaluated whether morphological differences among populations of Carnegiea gigantea and Pachycereus pringlei actually represent evolutionary adaptation, different developmental responses to the environment, or simply differences in population age structure. Populations of Carnegiea running east …
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Analytical and Experimental Analyses of the Structural Properties of a Columnar Geocomposite Material
The columnar geocomposite is an innovative concept in subsurface drainage. An investigation has been conducted to study the structural properties of the columnar geocomposite under uniform pressures. The research included both analytical and experimental analyses.
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A Combined Study of Mesomorphism, Optical and Electronic Properties of Novel Columnar Liquid Crystals
Columnar mesophases of discotic liquid crystals (DLCs) are a separate class of organic semiconductors. Anisotropic charge transport, high charge carrier mobility, and self-organizing properties have been regarded as superior properties of DLCs but their performance in devices, such as organic …
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A User-Centric Tabular Multi-Column Sorting Interface For Intact Transposition Of Columnar Data
… selection of database arrays issued to columnar displays for the purpose of intact transposition of data. This is a unique process designed as a user-centric tabular multi-column sorting interface. Designed within this experimental software application is a "trickle down" logic perceived …
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Development and validation of a gastroenterology probe capable of measuring the position of the squamo-columnar junction
The squamo-columnar junction is an important landmark in the upper gastro-oesophageal anatomy, acid reflux occurring above this causes heartburn and may lead to oesophageal cancer if prolonged. Currently no medical device takes into account the position of the squamo-columnar junction despite its …
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Growth of epitaxial nanoscale columnar copper indium diselinide thin films by introduction of sodium flouride during growth
… roughness. Larger amounts of NaF resulted in columnar epitaxial films with <112> surface facets on the sides of the columns. X-ray diffraction shows all films to be largely epitaxial, with small amounts of (301)-surface-oriented CIS grains present in films with the highest NaF addition. In the …
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The Columnar Lined Esophagus: aspects on the assessment of dysplasia and on the relationship with the esophageal submucosal glands
Columnar metaplasia, where columnar epithelium replaces the normal squamous epithelium in esophagus, is considered to be a precancerous condition in which the development of adenocarcinoma can be followed through various grades of dysplasia. The interpretation of these histological changes is …
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Freeze casting of bioactive glass and ceramic scaffolds for bone tissue engineering
… of the oriented pores, giving scaffolds with a columnar-type microstructure and larger pre width (90-110 µm). The scaffolds showed a unique 'elastic-plastic' mechanical response in compression along the orientation direction, with large strain for failure (greater than 20%) and strain rate …
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The ontogeny and functional distribution of novel, neurochemically-defined columns in mammalian visual cortex
… were expressed at high levels within the same columnar compartments, but within different geniculate-recipient layers of area 17. These columns of 5-HT receptors measured about 400 [t,m wide with a centre-to-centre spacing of approximately 900 Inn. The ontogenic distribution of synaptic zinc …
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Effect of grain structure and doping on the mechanical properties of polysilicon thin films for MEMS
… Laboratories. The films were comprised of either columnar grains (grain size 285 nm) or a laminated structure (grain size 125 nm), and were doped with different concentrations of Phosphorus (P). The columnar grain polysilicon typically had 1 - 2 grains across the film thickness, while the …
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CHuff: Conditional Huffman String Compression
Columnar databases have become ubiquitous in recent years due to their performance for analytical processing applications. Data storage in columnar form benefits from opportunities for improved compression performance as compared to row-oriented systems. For common string data, dictionary encoding …
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Predictions of leachate generation from minerals processing waste deposits
… is generally investigated using laboratory columnar experiments which attempt to mimic the physical and chemical processes which occur in the deposit. These experiments, termed lysimeter experiments, are time consuming in that they typically last for at least a few months and can last for up …
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The Roles of EGFR and FGFR2 in Cell Shape Maintenance of Human Lung Tip Progenitor Epithelial Cells
… condition, the progenitor cells retain their columnar cell shape, resembling the morphology of the developing lung tip epithelia in vivo. Cell shape and cell fate are highly coordinated during development. Therefore, I used the organoid system to identify signalling pathways that maintain the …
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Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets
… flow organizes in large cyclonically rotating columnar eddies parallel to the rotation axis, which drive upgradient angular momentum eddy fluxes, generating the observed equatorial superrotation. Heat fluxes align with the axis of rotation, contributing to the observed flat meridional emission. …
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A Study of Narrowband Noise Characteristics Associated with Vortex Motion in High Temperature Superconductors
… The power spectra generated for point and columnar disorder are then compared for increasing vortex density. Above, but near the depinning threshold, broadband noise associated with plastic vortex flow is observed for columnar defects at low vortex densities, while for higher densities a …
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Comparative Toepad Morphology in Chorus Frogs (Genus Pseudacris): Arboreal, Terrestrial, and Ground Dwelling Species
… The microstructure of the pad cells consists of columnar epithelium with free apices. The terrestrial species have an elongated pad with proximal extensions into the normal epithelia, and is bound on either side by indistinct folds rather than a groove and ridge. The semiaquatic species also had …
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