3. Electronic Theses and Dissertations (ETDs) - All submissions

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    Stirling cycle engine design and optimisation
    (2011-11-29) Berchowitz, David M.
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    Layout, design and new technology: a documentation and analysis of the impact of new technologies on the design and layout of The Star.
    (2009-01-12T11:55:19Z) Chalmers, Nina Barbara
    ABSTRACT A documentation and analysis of the impact of new technologies on the design and layout of The Star, particularly desktop publishing hardware and software, digital photography and the Internet. A broad outline of the production and editorial technology employed prior to the introduction of fourth wave in 1995 is provided to contextualise the research. A systematic visual analysis of selected pages from the 1920s to present as well as interviews with key members of staff from The Star, who have experienced the evolution of the paper first-hand, provide the primary source of information for the study. To prevent the paper from becoming too anecdotal, the organisational approach to the study of the media and theory of visual culture provide the theoretical framework. The research concludes that new technology itself has not drastically affected the design and layout of The Star over the past decade, but rather stimulated change within the organisational environment, which gradually did affected the visual appearance of the paper.
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    When power stepped off its pedestal ... the design of the Pan-African Parliament
    (2008-10-08T07:27:53Z) Adam, Mohammed
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    Design and construction criteria for domes in low-cost housing
    (2007-02-15T11:49:30Z) Talocchino, Gianfranco
    This dissertation investigates the different design and construction considerations involved when building a masonry dome. A detailed shape investigation was undertaken in order to summarize the best shaped dome structures. General recommendations are given for the shapes that produce the least tension and the most useable space. The effects of openings, temperature loading and wind loading were considered and a finite element analysis of the final structure was undertaken. It was found that regions of high tension exist around openings, especially under temperature loading, and materials suitable to resisting this tension were investigated (fibre plaster, chicken wire mesh and wire wrapping around openings). The final structure was built using an inflatable formwork. The construction procedure was well documented and a study of alternative methods of construction is presented. This dissertation shows that a durable, architecturally and structurally efficient low-cost masonry dome can be built if proper attention is given to minimizing and resisting tension within the structure.
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    An Evaluation of Digital Methods in Reverse Engineering Using Selected Medical Applications
    (2006-11-17T10:06:50Z) Parrott, Andrew Mark
    This dissertation investigates the use of digital modeling methods for selected medical applications. The digital methods include the design of a cranial implant, auricular prosthesis and the duplication of an oral prosthesis. The digital process includes imaging, image processing, design and fabrication steps. Three types of imaging used are contact and non-contact measurement systems and CT scanning. The investigation uses a Phantom haptic device for digital design. The implants and prostheses are fabricated using a Thermojet printer and investment casting. Traditional and digital processes are compared using four case studies on selected criteria. The conclusions of the investigation are that a digital process can be used and is equal to or better than traditional methods in prosthesis and implant design.
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    Patch Antenna Design
    (2006-03-27) Shaw, Gareth Louis
    This paper describes the formulation of a design procedure for the rectangular, probe-fed and rectangular, electromagnetically coupled patch antennas. The design procedure is presented in the form of design curves. The design curve data was generated by solving a bandwidth optimization problem subject to a specified minimum gain constraint. Given a particular performance requirement, an appropriate antenna geometry can be found using the design curves. An unavoidable tradeoff between the gain and impedance bandwidth performance parameters is evident from the design curves. The bandwidth and minimum gain configurations for design of the probe-fed patch range from 6.2% and 9.9dBi to 13.2% and 6.1dBi respectively. The bandwidth and minimum gain configurations for design of the electromagentically coupled patch range from 9.5% and 9.7dBi to 44% and 6.0dBi respectively.
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