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 106 for “"surface texture"”.
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A surface texture modeling system for solid freeform fabrication
… layers by ink jet printing binder onto the surface of a bed of powder. The bed of powder is lowered and fresh powder is spread onto the bed. As subsequent cross sections of the part are printed, the part exists, submerged in the powder bed. Access to the individual layers as they are …
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Design of Surface Texture for the Enhancement of Tribological Performance
Surface texturing is a method of surface modification that fabricates micro patterns on the contacting surfaces to improve the tribological performance in sliding, lubricated system. It is found that the geometric design of textures has a significant influence on the performance of textured …
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Three dimensional surface texture analysis for characterisation of enamel erosion
3D surface texture parameters have yet to be applied to dental erosion of human enamel. This project aimed to investigate the effect of acid-mediated erosive enamel wear on the micro-texture of polished (Group 1) and unpolished (Group 2) human enamel in vitro. 20 polished and 20 unpolished enamel …
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Surface texture as a source of haptic spatial information for blind children
Contains fulltext : 146595.pdf (Publisher’s version ) (Open Access)
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Pollinator behaviour and the evolutionary genetics of petal surface texture in the Solanaceae
Conical cells in the petal epidermis are a common trait across the angiosperms, and influence pollinator behaviour and pollination success. This work explores two key aspects of conical cell evolution: firstly, why conical cells are so prevalent across many diverse species, and secondly, why some …
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Classification of soil surface texture using high-resolution RGB images captured under uncontrolled field conditions
… practices requires accurately classifying its texture. Accurate soil texture classification can optimize soil nutrient levels and improve land management. This study proposes a framework that uses images captured under Uncontrolled Field Conditions (UFC) to classify soil texture for farmlands …
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Surface texture enhancement of SLS processed turbine blades using a mix of flexible media and abrasives
Additive manufacturing technologies such as Selective Laser Sintering of Grade 5 Titanium has been used extensively within the aerospace industry as it allows for the fabrication of complex shapes with minimal material wastage. With the increased use of complex shapes, newer polishing technologies …
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How does rock-ramp fishway surface texture affect the passage success of small-bodied Great Plains fishes?
… fishway design parameters of slope, length, and texture. Recent research has provided more information on fishway slope and length, and identified texture of the surface between the larger roughness elements as an area needing more investigation. We evaluated the effects of four surface textures …
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The effect of two bleaching products on microhardness and surface texture of different dental aesthetic restorative materials
… bleaching agents on the microhardness and the surface texture of six different aesthetic restorative materials were evaluated. <br>Four different composite resins (a hybrid, a flow, a micro-hybrid and a nano-hybrid), an ormocer, and a ceramic, were used and two bleaching agents were tested: …
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Extraction of surface texture data from low quality photographs to aid the construction of virtual reality models of archaeological sites
… occlusion. Occlusions are filled by extracting texture and calculating hidden geometry from casual photographs with the support of three-dimensional geometric data gleaned from the photogrammetric survey. The essential philosophy underlying the tool is to segment each occlusion into surfaces …
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The effect of surface finish on piston ring-pack performance in advanced reciprocating engine systems
… frictional losses within an engine. Methods of surface texture optimization were investigated to reduce piston ring-pack friction and increase engine brake thermal efficiency. Adverse effects of surface texture optimization on engine oil consumption and durability were also considered. Although …
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A hybrid haptic stimulation prosthetic wearable device to recover the missing sensation of the upper limb amputees
… is capable in sensing the contact pressure, the surface texture, and the temperature, simultaneously, was designed for a prosthetic hand to provide a tactile sensation to amputation patients. In addition, the haptic system was developed to enable the prosthetic’s users to implement withdrawal …
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Micro-textured surfaces for omniphobicity and drag-reduction
When a liquid droplet contacts a surface possessing the appropriate combination of surface texture and solid surface energy, the liquid may not penetrate into the surface texture. Instead, the droplet sits partially on air, forming a solid-liquid-air composite interface. Entrapped air pockets of …
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Influence of contact conditions on thermal responses of the hand
… contact force, contact duration, the object's surface temperature, and its surface roughness. The thermal response of the finger pad was measured using an infrared camera as the contact force varied from 0.1 to 6 N. It was determined that the decrease in skin temperature was highly dependent on …
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New wavelet based space-frequency analysis methods applied to the characterisation of 3-dimensional engineering surface textures.
… to make progress solving real problems of surface texture characterisation. A measurement apparatus like a microscope gives a representation of a surface textures that can be seen as an image. This is actually an image representing the relief of the surface texture. From the image …
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The effect of texture granularity on turbulence
We study the effect of surface texture on an overlying turbulent flow for the case of textures made of an alternating slip/no-slip pattern, a common model for super- hydrophobic surfaces. For texture sizes L⁺ ≤ 20, it has been previously discussed that turbulence remains smooth-wall-like, other …
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Theoretical and Experimental Investigations on Microelectrodeposition Process
… size range. This technique is utilized to coat surfaces with protective films of several micrometers thickness or fabricate standalone microstructures. In this process, an electrochemical reaction occurs on the electrode surface by applying an electric voltage, called overpotential. Different …
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Methods for the integrated design of viscoelastic materials and structural geometry
… in Part I present methodologies for designing surface texture geometries and other challenging design problems. Studies in this part present surface texture parameterizations for enhancing the lubricated frictional performance indices by eliminating unnecessary design constraints (Chapter 2), …
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Nanoscale modification of key surface parameters to augment pool boiling heat transfer and critical heat flux in water and dielectric fluids
Surface effects on pool boiling heat transfer and the critical heat flux are well documented but poorly understood. This study investigates the pool boiling characteristics of various fluids, and demonstrates that surface effects can drastically alter the nucleate boiling heat transfer coefficient …
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