Global ETD Search

91	High Frequency Electrochemical Nanopolishing of Alpha Titanium Kanchwala, Abbas M 16 December 2013 (has links) Product miniaturization is an ever increasing customer demand in aerospace, bio-medical, defense and electronics industries. These microparts play a vital role and are required to abide by stringent norms set forth by various quality control agencies. To maintain their functionality over a period of time, they are made of special engineering materials rather than silicon as commonly used in microelectronics. Lithography, etching, embossing, electroplating, laser machining and other micro manufacturing techniques have been employed traditionally to manufacture microcomponents; however, these techniques would be expensive, cause surface damage, or produce a very rough surface. Electrochemical polishing is capable of machining/polishing any conducting material while holding close dimensional tolerances. This research develops a high frequency electrochemical nanopolishing technique for commercially pure alpha titanium. An alcohol and salt based electrolyte was used with direct current as well as alternating current on alpha titanium plate. For both current types, optimal surface roughness R_(a) ~ 300 nm was obtained on poly grained surface using interferometry and ~ 2 nm within a single grain by atomic force microscopy. Comparable results were obtained by other researchers with 30-120 nm R_(a) for titanium and titanium alloys. Linear regression models were developed to predict the surface roughness. The surface roughness predicted by the models was found to be within 26% of the measured values. Electrochemical polishing medical implants
92	Photoelastic stress patterns produced by the angled distal implants in the All-on-Four concept. Begg, Tasneem. January 2006 (has links) <p>The purpose of this study was to investigate the stress produced around the angled distal implants under simulated occlusal loading in the All-on-Four&ordf / concept by means of two-dimensional photoelastic stress models.</p> Dental implants Prosthodontics.
93	Porous plastic implants for bone ingrowth Sridharan, Srinivasan 08 1900 (has links) No description available. Plastics in surgery Implants Artificial
94	Thermoplastic composites in medical implants Loh, Galay 08 1900 (has links) No description available. Thermoplastics Orthopedic implants
95	Bone biocompatibilty of polymer based materials Sasanaluckit, Piyamol Nuttanun January 1994 (has links) No description available. 610.28 Surgical implants
96	Bone response to biomaterials Albustany, Kamal Rashed January 1995 (has links) No description available. 610.28 Grafts; Implants
97	Photoelastic stress patterns produced by the angled distal implants in the All-on-Four concept. Begg, Tasneem. January 2006 (has links) <p>The purpose of this study was to investigate the stress produced around the angled distal implants under simulated occlusal loading in the All-on-Four&ordf / concept by means of two-dimensional photoelastic stress models.</p> Dental implants Prosthodontics.
98	On immediate/early loading of implant-supported prostheses in the maxilla / Fischer, Kerstin, January 2008 (has links) Diss. (sammanfattning) Göteborg : Univ. , 2008. / Härtill 5 uppsatser. Dental implants. Maxilla.
99	Factors affecting peri-implant tissue reactions / Hultin, Margareta, January 1900 (has links) Diss. (sammanfattning) Stockholm : Karol. inst., 2001. / Härtill 5 uppsatser. Dental implants. Dentala implantat.
100	Environmental sound perception for cochlear implant users : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Audiology in the University of Canterbury / Arnephy, J. M. January 2008 (has links) Thesis (M. Aud.)--University of Canterbury, 2008. / Typescript (photocopy). Includes bibliographical references (leaves 66-68). Cochlear implants. Auditory perception.

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