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 39 for “"Serrated"”.
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Aspects of serrated flow in aluminium alloys
… of the work, and at strain rates such that serrated tensile test curves were manifest. The evolution of microstructural features of the deformation was evaluated utilising both optical and electron microscopy. Surface deformation features, including the formation of both type A and type B …
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Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field
… of trailing edge noise reduction is using a serrated trailing edge. Many prior experiments have shown that a trailing edge with sawtooth serrations can reduce trailing edge noise compared to a straight trailing edge, but the mechanism by which sawtooth serrations reduce noise is not fully …
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Comparative Analysis of Serrated Trailing Edge Designs on Idealized Aircraft Engine Fan Blades for Noise Reduction
The effects of serrated trailing edge designs, designed for noise reduction, on the flow-field downstream of an idealized aircraft engine fan blade row were investigated in detail. The measurements were performed in the Virginia Tech low speed linear cascade tunnel on one set of baseline GE-Rotor-B …
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A Method for replacing serrated tussock (Nassella trichotoma) with kangaroo grass (Themeda triandra) in lowland native grassland remnants
… was developed which replaces the noxious weed serrated tussock (Nassella trichotoma (Nees) Arech.) with indigenous kangaroo grass (Themeda triandra Forrsk.) in partly disturbed remnants of western (basalt) plains indigenous grassland, a community listed as vulnerable to extinction. …
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Sessile serrated lesions in focus: Examining temporal trends, patient risk factors, and the role of the endoscopist in lesion detection
Serrated polyps of the colorectum have become increasingly recognized as an important clinical entity, as these precursor lesions are hypothesized to be responsible for up to 25% of sporadic cases of colorectal cancer. Much confusion exists regarding these polyps; particularly, their classification …
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Modifications of Coherent Structures in Fan Blade Wakes for Broadband Noise Reduction
… of unmodified GE-Rotor-B blades. Four sets of serrated trailing edge blades (with two different serration sizes and with two trailing edge cambers) and three sets of blades with trailing edge blowing (a simple rectangular slot, rectangular slot with Kuethe-vane vortex generators, and …
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Harvesting machinery technologies for precision and sustainable sugarcane production
… conventional straight blade, 30° angled blade, serrated blade, and straight blade with laser cladding on its underside. Stem damage and root system damage were considered as cut quality indicators. Percentage of undamaged stalks from the angled, laser clad, serrated and straight blades was …
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Elevated temperature mechanical properties of line pipe steels
… under a tensile load of 419 MPa. The presence of serrated yielding depended on temperature and strain rate, and the upper bound of the temperature range where serrated yielding was observed was independent of microstructure between the ferrite-pearlite (X52) steel and the X70 steels. Serrated …
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Aeroacoustic transfer of leading edge serrations from single aerofoils to low-pressure fan applications
… transfer of a well-investigated aerofoil with serrated leading edges from the rigid to the rotating domain. With this purpose, a single aerofoil type is selected and thoroughly analysed, experimentally and numerically, to generate a reliable data basis for aerodynamic performance and noise …
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Cálculo de placas com ângulos reentrantes
… and examples of plates with variable bevel, and serrated boundary were also studied. In the analysis, the finite element method was employed, using the "LORANE" programs, with a non-conforming rectangular finite element, presenting four nodes and twelve nodal displacements, and "STAP", with an …
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Analysis and design of planar slot antennas for RFID applications using characteristic mode theory
… planar antenna is done in three separate parts: serrated plate, rectangular slot and spiral slot. By appropriately selecting the serration geometry, the lower order characteristic modes can be combined to yield wider bandwidth in planar antennas. By selecting appropriate feed location based on …
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Beta-catenin Complexes in Colorectal Cancer
… of β-catenin was measured in adenomatous and serrated human colorectal polyps. In all polyps, the predominant location of β-catenin was the plasma membrane, even in polyps with a serrated histology and reduced PTEN signals. However, the changes in E-cadherin observed in cultured cells lacking …
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The Role of EHD2 in Endothelial Cells
… the loss of filamentous actin and an increase in serrated junctions in cells that have an excess of EHD2. This change is not just seen in cells - when EHD2 is knocked out in fish, there are visible changes in the junctions that are similar to what occurs in the EHD2si Endothelial cells.</p>
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Tests of Adaptive Coloration Hypotheses for Madtom (Notorus) Catfishes (Siluriformes: Ictaluridae)
… stings. Thirteen of the 25 nominal species have serrated spines in the pectoral sting and a contrasting pigment pattern. Behavior of two saddled species, N. miurus and N. hildebrandi, and one uniformly colored species, N. leptacanthus, was investigated to test if the pigment pattern is …
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Kabeshinàn: Situating the BiFw-6 Site in Broader Regional and Cultural Landscapes
… Kabeshinàn ceramic type and the Kabeshinàn serrated ceramic type.
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Net-shape hot isostatic pressing of a nickel-based powder superalloy
… the γ′ solvus resulted in coarser grains with serrated boundaries and in the formation of irregular-shaped secondary γ′ and fan-type γ-γ′ structures. Factors which influence the growth and morphology of γ′ particles are considered and it is shown that particle impingement dominates in the …
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Mathematical modelling of noise generation in turbofan aeroengines using Green’s functions
… model to investigate the effect of the serrated edge, which again involves solving a differential equation by using a Green’s function. It also requires modelling the turbulence, which we do by using either deterministic eddies or stochastic eddies. We show it is possible to reduce the …
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Elevated temperature mechanical properties of line pipe steels
… behavior within the DSA regime) include: serrated flow curves, stable localized deformation (in the form of propagating and nucleating deformation bands), increasing flow strength as a function of temperature, reduced ductility relative to room temperature, high strain hardening rates, …
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Impact of ground plane serrations on radiation and impedance characteristics of a slot antenna over a conductive back plane
… and thickness for the conductor-backed, serrated slot antenna. In our analysis we use simulations which we validate through measurements. Two bandwidth measures, L-network matched and intrinsic, are used to evaluate impedance bandwidth across many design variations. Finally, the far-field …
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Endoscopy-focused primary, secondary and tertiary prevention of colorectal cancer
… lesions (e.g. colorectal adenomas and sessile serrated adenomas/polyps). This was a prospective study carried out at the Lyell McEwin Hospital (South Australia) examining whether and by how much factors such as alcohol consumption and smoking are associated with colorectal lesions. A cohort of …
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