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 29 for “"Surface Textures"”.
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Surface textures and other features of diamonds
… localities, are reported. Forty-one pristine surface textures are distinguished, including twelve which are described for the first time. Only two surface textures are ascribed to crystal growth. The others are considered to result from crystal resorption and etching although internal …
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Surface textures on pyrope, picroilmenite and chrome diopside from Kimberlite
The examination and interpretation of surface features on pyrope, picroilmenite and chrome diopside from kimberlite gives valuable information on the history of these minerals both during and after kimberlite emplacement. Descriptions and scanning electron photo-micrographs of surface features …
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Droplet levitation and underwater plastron restoration using aerophilic surface textures
… of active components in liquids and responsive surfaces to resist the wetting of water on solid surface textures. When a superhydrophobic surface comes into contact with water, it traps a thin layer of air (plastron) within its surface texture. This entrapped air is advantageous for reducing the …
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Geometry mediated drag reduction using riblets and wrinkled surface textures
The surfaces of many plants and animals are covered with a variety of micro-textures such as ribs or 3D tubules which can control surface-mediated properties such as skin friction. Inspired by the drag reducing ability of these natural structures, especially the ribbed features on shark denticles, …
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Co-design of surface textures and non-newtonian fluids for decreased friction
… context of lubricated sliding for co-design of surface textures and rheologically complex fluids to enhance friction reduction; however, the design methods presented are general, and can be applied to any design problem where non-linear rheological behavior is important. For the case study of …
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Surface textures and non-Newtonian fluids for decreased friction in full film lubrication
Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of …
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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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Liquid phase crystallized silicon on sinusoidal textured glass substrates
… Nanoimprinted high-temperature stable front surface textures using hexagonal sinusoidal nanotextures are studied for application in state-of-the-art liquid phase crystallized silicon thin-film solar cells. The findings may be used to develop improved cell designs and to gain substantial …
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Rough Hewn
… It is a reflection of my appreciation of the raw surface textures and shapes that can be captured in wood; the "How?" and "What If?" of the objects, materials, and processes that inform my creative development. As I compose my sculptures working with rough-hewn timber, I consider the dichotomy of …
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Properties of mortar bond to various brick
… mortar bond to brick with emphasis in texture of surface of brick in contact with mortar which joins them. Proposal IV - A comparison of the mortar bond of a make of brick of original high suction rate with a representative of the same make of brick and the same suction rate but which has been …
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Standardization of test methods for property evaluation of FRP bars
… and aramid), varying diameters (# 3 to #8) and surface textures (ribbed, sand-coated, and sand-coated with helical wraps) were tested under this research.;Tension tests were conducted using grips made of split schedule 80 steel pipes that were bonded to the bars using a commercially available …
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Adapting Monte Carlo Localization to Utilize Floor and Wall Texture Data
… This thesis explores using wall and floor surface textures to help the algorithm determine locations more accurately. Wall textures are captured by using a laser range finder to detect patterns in the surface. Floor textures are determined by using an inertial measurement unit (IMU) to …
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Effects of lubricant viscosity and surface texturing on ring-pack performance in internal combustion engines
… combustion engine. Both lubricant viscosity and surface texturing were investigated in an effort to reduce this ring-pack friction and increase engine efficiency. While both optimizing viscosity and surface texturing are predicted to cause a reduction in ring/liner friction individually, a …
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Recommendations for Surface Treatment for Virginia Inverted T-Beam Bridge System
This thesis investigates the impact of interface surface treatment methods for use in the Virginia Inverted T-Beam bridge system. The specific system consists of precast beams with thin bottom flanges placed next to one another, with a cast-in-place slab on top. Previous research has shown that the …
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A Study of Dew Harvesting and Freezing Performance of Non-Wetting Surfaces
Non-wetting surfaces offer enhanced capabilities over bare metal substrates for condensation with or without phase change. This trait can be utilized to broaden strategies in combating water scarcity in water stressed areas. Slippery lubricant infused surfaces have the ability to shed water …
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The rates of oxidation of galena and sphalerite in acidic ferric chloride solutions
… to the oxidizing conditions of the earth's surface, their metal ions are released into solution and the S²⁻ is oxidized to either elemental sulfur or sulfate. The experiments described here used a mixed flow reactor system to determine the oxidation rates of galena and sphalerite under …
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A finite element study of the mechanics of micro-groove machining of 4340 steel
… masks, micro-forming dies, engineered surface textures, etc. The challenge of achieving such feature is the control of the process parameters to minimize the side burr that often damages the microgroove. Besides, there is a limitation of the experimental study on gathering the cutting …
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Design and manufacturing of PDMS micro structures with dynamic inclination angle
… techniques enable new understanding of surface phenomena such as liquid wetting and dry adhesion. This understanding led to a surge of design and fabrication of novel non- and directional wetting, self-cleaning, anti-biofouling and energy efficient surface textures. This work focuses on …
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A study of bubble wetting on surfaces
… toward a better understand of bubble wetting on surfaces, so that future microfluidics devices can be designed to be more robust and free of bubbles. Current wetting theory as applied to bubbles is examined, and two key areas for improvement are identified: disjoining pressure effects and …
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How does rock-ramp fishway surface texture affect the passage success of small-bodied Great Plains fishes?
… 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 (smooth; 1 – 2 mm diameter coarse sand; 6 – 10 mm diameter pea gravel, and; 19 – 31 mm diameter small cobble) on …
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