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 37 for “"striations"”.
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Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides
… range-frequency waveguide invariant describes striations that often appear in plots of acoustic intensity versus range and frequency. These range-frequency striations have properties that depend strongly on the frequency of the acoustic source and on distance between the acoustic source and …
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Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides
… range-frequency waveguide invariant describes striations that often appear in plots of acoustic intensity versus range and frequency. These range-frequency striations have properties that depend strongly on the frequency of the acoustic source and on distance between the acoustic source and …
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An investigation into the effect of longitudinal micro-striations and their profiles, on the drag of flat plates
This report describes an investigation into the use of streamwise-machined grooves as a means of reducing the drag force experienced by a flat plate. V-grooves of specific dimensions are machined onto the surface of a smooth plate, in a streamwise direction. The effect of these surface …
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Energy pathways and structures of oceanic eddies from the ECCO2 state estimate and simplified models
… in the low-frequency eddy field are termed striations. How much oceanic variability is associated with striations? How does the time-mean circulation, for example a subtropical gyre or constant mean flow, influence the origin and characteristics of striations? How much do striations …
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Energy pathways and structures of oceanic eddies from the ECCO2 State Estimate and Simplified Models
… in the low-frequency eddy eld are termed striations. How much oceanic variability is associated with striations? How does the time-mean circulation, for example a subtropical gyre or constant mean ow, inuence the origin and characteristics of striations? How much do striations contribute …
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Marangonikonvektion: Ihre Auswirkung auf die Schmelze und den Kristall bei der Züchtung von Si, Ge und GeSi mit freien Schmelzzonen
… unerwünschte Dotierstoffschwankungen sogenannte Striations im Kristall hervorgerufen. Bei den meisten Züchtungstechniken werden diese Strömungen durch eine Überlagerung verschiedener Konvektionsmechanismen angetrieben. Die Floating-Zone-Züchtung von Silicium im Spiegelofen ermöglicht es, die …
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Towards structural characterisation of ciliary rootlets, ciliary caps and intraflagellar transport
… with an amorphous striation and three confined striations each 81.3 nm. Subtomogram averaging showed the absence of lateral regularity in both the filaments and confined striations. The confined striations consist of globular densities associated to filaments, frequently found as parallel …
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On the molecular pathways supporting the development of structurally coloured cuticle in Hibiscus trionum
… the cuticle showed the presence of nano-scaled striations acting as a grating like surface responsible for the diffraction of light. Computational modelling, and existing knowledge in material physics, suggests that the development of such a structure is induced by the buckling of the petal …
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Trailing vortex free-surface interaction
… of understanding the origin and scars and striations. Velocity and turbulence measurements have been carried out through the use of a Laser-Doppler-Velocimeter (LDV) for various positions of the vortex relative to the free surface. The results have shown that the vortex motion affects the …
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Structure of the electron diffusion region in magnetic reconnection with small guide fields
… this reveals its highly structured nature, with striations corresponding to the number of times an electron has been reflected within the region, and exposes the origin of gradients in the electron pressure tensor important for momentum balance. The addition of a guide field changes the nature of …
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The influence of hydrogen on the evolving microstructure during fatigue crack growth in metastable and stable austenitic stainless steels
… corresponded to the peaks and troughs of the striations. This observation is counter to the current understanding that striations form during the crack advance process, independently of the evolved microstructure. The resulting microstructures in all hydrogen-induced studies are discussed in …
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Etching kinetics and surface roughening of polysilicon and dielectric materials in inductively coupled plasma beams
… the feature sidewalls forming anisotropic striations. A clear understanding of the origin and control of sidewall roughening is extremely desirable, particularly at the gate level where variations in line width can adversely impact the electrical performance of the device. In addition, at …
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Taphonomy of a Lance Formation(Maastrichtian, WY) Dinosaur Bonebed with a Focus on Tooth Traces
… bone, allows for us to measure the widths of the striations left by the tooth denticles scraping along the bone’s surface. Comparison with theropod teeth from the Lance Formation leads us to concludeit was bitten by another tyrannosaurid, suggesting possible cannibalism in the species …
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The blending of hydroxypropyl lignin with poly(methylmethacrylate) and poly(vinyl alcohol)
… whereas injection molded blends showed HPL striations that were closely associated with the matrix. Injection molded blend's T<sub>g</sub> values were found to more closely follow predicted T<sub>g</sub> values (Flory-Fox equation) and injection molded blends also showed consistently …
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Development of the Strain-To-Fracture Test to Study Ductility-Dip Cracking in Austenitic Alloys
… there was evidence of slip lines and thermal striations.
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Weichselian glaciations in the middle Notec River region, northwest Poland
… directional elements such as clast fabrics, striations and deformations. The first ice (Dziembowo ice advance), tentatively assigned to the Middle or Late Weichselian, initially moved towards the SE while creating large thrust ridges. The ice movement direction shifted towards the SW at the …
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Stratigraphic and Geochemical Expression of Early Cretaceous Environmental Change in Arctic Svalbard
… they were rafted by glacial ice (e.g. surface striations), although could have been rafted by seasonal sea-ice. The results show that regionally widespread cold water conditions were the most likely control on ikaite formation and glendonite preservation. This counters recent studies that …
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Early human adaptation in the northern hemisphere and the analytic implications of taphonomy
… faunal elements are well preserved and retain striations resembling tool-made cutmarks. The lack of reliable evidence in these ancient faunal assemblages for cultural causality stimulates a re-examination of adaptive models which emphasi7e a hunting way of life for the Lower and Middle …
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Towards Coupled Nonhydrostatic-Hydrostatic Hybridizable Discontinuous Galerkin Method
… results on Rayleigh Taylor instability-driven striations to evaluate computational savings and accuracy compared to the standard NHS HDG and finite-volume solvers. We highlight and discuss sensitivities and performance. Finally, we explore parameters that can be used to identify domain regions …
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Generation of Titanium Dioxide Parts using Cellulose Nanocrystal Aerogel Hard Templates
… including lamellar sheeting, flakes, ribbons, or striations. Ceramic green bodies are then produced by reacting Titanium isopropoxide with water through several different processes to generate amorphous TiO2 either in-situ in the CNC aerogel or as a suspension for infiltration under varying …
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