Global ETD Search

51	Fabrication of superconducting material for application as wire or ribbon replacement Ahmad, Anis January 1989 (has links) No description available. Engineering, Mechanical Fabrication Superconducting Material Wire Replacement Ribbon Replacement
52	Availability analysis of opportunistic age replacement policies Degbotse, Alfred Tsatsu 06 June 2008 (has links) This research develops the availability function for a two component series system in which a component is replaced because of component failure or because it reaches a prescribed age. Also each component replacement provides an opportunity for the replacement of the other component. This last maintenance policy is called an opportunistic replacement strategy. The system functions only if the both components of the system are functioning. The system fails if either of the components fails. Component i is replaced if it fails before attaining age T<sub>i</sub> since it was last replaced or maintained. The component i is preventatively maintained if is has not failed by the age T<sub>i</sub>. This type of replacement plan is called age replacement policy. When component 1 is being replaced or preventatively maintained, if the age of component j ≠ i exceeds τ<sub>j</sub> then both components i and j are replaced at the same time. This type of replacement is called opportunistic replacement of component j and τ<sub>j</sub> is called the opportunistic replacement time for component j. The time dependent and long run availability measures for the system are developed. A nested renewal theory approach is used is used to develop the system availability function. The nesting is defined by considering the replacement of a specific one of the components as an elementary renewal event and the simultaneous replacement of both components as the macroscopic renewal event. More specifically, the renewal process for the system represents a starting point for the entire system and is in fact a renewal process. The intervals between system regeneration points are called “major intervals". The age replacement time T<sub>i</sub> and opportunistic replacement time τ<sub>i</sub> are treated as decision parameters during the model development. The probability distribution of the major interval is developed and the Laplace transform of the system availability is developed. Four replacement models are obtained from the main opportunistic age replacement policy. These are a failure replacement policy, an opportunistic failure model, a partial opportunistic age replacement policy and an opportunistic age replacement policy. These models are obtained as specific cases of the general model. The long run availability measure for the failure replacement model is proven to be the same measure as that developed by Barlow and Proschan. This proof validates the modeling approach. / Ph. D. opportunistic replacement renewal theory replacement maintenance LD5655.V856 1996.D443
53	The development and subsequent deployment of an automated GC-system for monitoring trace atmospheric halocarbons in near-real time Bassford, Matthew Richard January 1998 (has links) No description available. 551.5
54	Characterisation of oestrogen's anabolic effect on the skeleton of female mice Samuels, Abigail January 2000 (has links) No description available. 615.1
55	The design and preliminary evaluation of femoral capital epiphyseal replacement arthroplasty Field, R. E. January 1988 (has links) No description available. 610 Hip joint replacement design
56	Tibial rotation in patients after total knee joint replacement Foley, Elizabeth Louise January 2002 (has links) No description available. 617 Fixed bearing knee replacement
57	On AB initio solutions to the phase problem for macromolecular crystallography Leggott, Richard James January 1996 (has links) No description available. 530.41
58	Purinergic receptors in bone : expression and functional significance Bowler, Wayne Bowler January 1996 (has links) No description available. 572.8
59	Selective laser sintering of bioceramics Lorrison, Jonathan Charles January 2003 (has links) No description available. 610 Customised bone replacement implants
60	Wear properties of artificial hip joint materials Watters, Eamon Patrick John January 2000 (has links) No description available. 610.28 Replacement; Total; Lubrication; Wear

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