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 867 for “"DISC"”.
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A patient specific total disc replacement to treat degenerative disc disease
… arising from degeneration of the intervertebral discs (IVD). When conservative treatments fail, surgical replacement with an artificial total disc replacement (TDR) is often required. However, despite decades of refinement, current TDRs are unable to fully replicate the complex mechanical …
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In vivo lumbar spine biomechanics : vertebral kinematics, intervertebral disc deformation, and disc loads
… the physiological loads on the intervertebral disc. The system was shown to be accurate and repeatable in determining the vertebral kinematics in all degrees of freedom. For the first time, six degree-of-freedom motion of different structures of the spine, such as the vertebral body, …
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A high level disc controller
… the backing store, implemented by a moving-head disc for example is under the control of the real-time operating system. This can have serious consequences. If real-time requirements are to be met, transfer to and from the disc must be made as rapidly as possible. Also, in initiating and …
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Protoplanetary disc evolution and dispersal
In this thesis I have studied how discs around young stars evolve and disperse. In particular, I build models which combine viscous evolution with photoevaporation, as previous work suggests that photoevaporation can reproduce the observed disc evolution and dispersal time-scales. The main question …
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Polymer Composite Spinal Disc Implants
… similar to that of the natural intervertebral disc, as well as find preliminary results for vertebral endplate connection and nucleus pulposus internal pressure, for the correction of disc degeneration in the spine. The three-part composite samples needed to demonstrate good shock absorption …
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Biomechanical Comparison of Lumbar Disc Replacements
… One seemingly promising area is the lumbar disc replacement. Design specifications vary among the manufacturers based upon differing perceptions of ideal motion. Comparison studies are important in quantifying different features for future improvements but are currently lacking. The …
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Cosmological Simulations of Galactic Disc Assembly
We address the issue of kinematic heating in disc galaxies by analysing a suite of cosmological Milky Way-type disc simulations run with different particle-and grid-based hydrodynamical codes and different resolution, and compare them with observations of the Milky Way. By studying the kinematics …
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Dynamical instabilities in disc-planet interactions
Protoplanetary discs can be dynamically unstable due to structure induced by an embedded giant planet. In this thesis, I discuss the stability of such systems and explore the consequence of instability on planetary migration. I present semi-analytical models to understand the formation of the …
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Disc-planet interactions in inviscid discs
Planets are born in protoplanetary discs (PPDs), made of gas and dust, which surround newly formed stars. Gravitational coupling provides planets with means to interact with their birth environment, leading to the excitation of global spiral density waves, which drive evolution of the disc (such as …
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Computer animation via optical video disc
… raster-scan computer animation and optical video discs. Animated sequences, generated at non real-time rates, then transfered to video disc, can be recalled under user control at real-time rates. Highly detailed animation may be combined with other media in interactive systems. Such systems …
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Effect of assessing glaucomatous optic disc changes using automated alternation flicker comparisons of serial optic disc stereophotographs
… institution. Serial sets of stereoscopic disc photography, SAP, and Stratus OCT were obtained with at least 1 year interval. Alternation flicker of superimposed, sequential images was made using computerized software. Single glaucoma specialist graded whether the tests represented …
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Uncertainty analysis of disc brake squeal propensity
… prediction of squeal propensity of a realistic disc brake using CEA on a finite element model updated by experimental modal testing results. While the deterministic model with a rough lining surface can predict some squeal frequencies identified in noise dynamometer tests, the deterministic …
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Planet formation and evolution in protoplanetary disc
… of planets via core accretion in protoplanetary discs - disc-shaped structures made of dust and gas that form around newborn stars- and in their subsequent evolution as a consequence of disc-planet interaction from a numerical and theoretical perspective. In the core accretion scenario, planets …
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Biomechanical Testing of Two-Level Cervical Disc Arthroplasty
… studies comparing two-level cervical disc arthroplasty with two-level fusion were completed using an established cadaveric cervical spine model. Three conditions were tested: non-instrumented, instrumented with two-level fusion (C5-C6 and C6-C7), and instrumented with two-level …
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A homotopy reciprocity law for ribbon disc complements
… this paper, we present two new spines for ribbon disc complements. We describe Craggs's 3-dimensional spine and introduce a 2-dimensional spine ${\cal W}\sp2$ which we show satisfies the homotopy reciprocity law. We demonstrate that the reciprocity property remains invariant under insertions and …
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Studying Accretion Disc Winds with X-ray Spectroscopy
… of matter in compact objects. Accretion disc winds are formed of hot and ionised material launched by magnetic forces, radiation pressure or thermally from the discs of accretors. They have been discovered in most types of accreting systems including supermassive black holes, classical …
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