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 78 for “"texturing"”.
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Micro Surface Texturing for Friction Control
Recently, surface texturing has gained momentum as a way to control the friction which is involved in various applications and systems, such as components of internal combustion engines, dies and punches of the metal forming processes and Micro-electrical-mechanical Systems (MEMS). This …
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Transient phenomena in false twist texturing
Thesis. 1976. M.S. cn--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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On the dynamics of draw texturing.
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Texturing absence: a geography of the disappeared Woodstock Beach
Up until the late 1960s, the Cape Town suburb of Woodstock had a beach. Decades of land reclamation – begun as early as 1890 – culminated in the beach being entirely subsumed by railways, roads, and harbor infrastructure. Woodstock's beachside heritage is largely unknown, as are the processes by …
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Steady state mechanics of the false twist yarn texturing process
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Adaptive Processing of Laser Scanning Data and Texturing of the Segmentation Outcome
… information. Therefore, a new region-based texturing procedure is proposed to incorporate the spectral information from overlapping images into the laser scanning-derived surfaces. This texturing procedure is implemented while investigating the visibility of the laser scanning-derived …
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Laser Surface Texturing To Create Biomimetic Surface Topographies For Marine Antifouling Efficacy Testing
… main research questions: (1) can laser surface texturing be used to create antifouling surfaces, and their effects on surface parameters (roughness / contact angle); (2) can biomimetic antifouling surfaces be created using laser surface texturing?; (3) can features of those successful surfaces …
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Laser Surface Texturing, Crystallization and Scribing of Thin Films in Solar Cell Applications
… than ablation which is dominant during fs laser texturing. Experimental and analytical approaches are also developed revealing the effect of hydrogen on texturing behavior and crystallization during excimer laser irradiation, and a step-by-step crystallization process is proposed to prevent the …
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Tribological studies of surface texturing for application in air-conditioning and refrigeration compressors
… to evaluate the possibility of using surface texturing for realistic gray cast iron compressor surfaces. Three types of micro-dimple patterns (40 μm diameter and 10 μm depth, 60 μm diameter and 7.5 μm depth, 60 μm diameter and 4 μm depth) with two area densities of 5% and 20% were created on …
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A tribological study of the interaction between surface micro texturing and viscoelastic lubricants
… in order to understand the effect of surface texturing and fluid rheology on sliding friction under lubricated conditions. Nickel micro textured surfaces containing 50 to 125 micron diameter pores and 1 to 20 percent area densities of pores are fabricated using novel techniques inspired by …
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Effects of lubricant viscosity and surface texturing on ring-pack performance in internal combustion engines
… 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 combined …
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Nanotexturing for Biomedical Implants
… the implant, or a capsule formation. Previously, texturing has been shown to reduce this capsule formation, using methods such as polyurethane coatings [11-15]. A new proposed texturing method is using electrospinning to produce nanofibers. The objective of this research is to coat water-soluble …
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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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Defining the role of elastic lubricants and micro textured surfaces in lubricated, sliding friction
… of how lubrication properties and surface texturing interact is poorly understood. This thesis presents a study of lubricant elasticity and surface micro texturing and explains the mechanisms for the resulting altered frictional profile on the Stribeck diagram. In this work, isolating …
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Digitally enabled surface function modification for wide area applications
… laser processing. Nano and femtosecond laser texturing have been used to modify surface topography and chemical functionality. Additive functional coating techniques included delivering materials by vapour transfer, laser induced reverse transfer and inkjet printing. Laser texturing can be …
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A parametric study of delaminations in an aluminum-lithium alloy
… is the motivation for this study. The effects of texturing from mechanical processing, and the varying fracture toughness from heat treatments are the focus of the current study. An elasto-viscoplastic model, based on the mechanical threshold state variable, was adopted to describe the …
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Electron-beam evaporated polycrystalline silicon thin-film solar cells: paths to better performance
… preparation, cell fabrication, glass substrate texturing and back surface reflectors. It can be categorised into two parts. The first part introduces the process of fabricating a metallised photovoltaic device from silicon feedstock. Important issues are addressed, such as doping control, …
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Nanostructured Back Reflectors for Solar Cell Application
… to increase the absorption in these cells. Nano texturing is one of the widely used methods for fabricating solar cell back reflectors. Peak height and angle distribution are key parameters needed to understand the effect of texturing in solar cell back reflectors, and to make stable and low-cost …
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A ray tracing investigation of light trapping due to grooves in solar cells
… Sachs and Dr. James Bredt have developed a texturing scheme that consists of trenches etched on the top surface of the silicon cell. The profile of the trenches will either be a simple semicircle or a parabola with a set aspect ratio. Our objective was to determine the optimal …
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