Thesis (M.S.)--Virginia Polytechnic Institute, 1961. / Vita. Abstract. Includes bibliographical references (leaves 58-59). Also available via the Internet.

Thesis (M.F.A.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains iv, 50 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 50).

Thesis (M. Phil.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 198-206).

Despite their well known superior load and stiffness characteristics, the wide-spread use of porous aerostatic bearings in preference to other bearing types has been hampered by difficulties in controlling the permeability of the porous material during manufacture and machining, in addition to instability problems caused by the additional volume of air trapped amongst the pores. Recent development in porous aerostatic bearings centres around the use of a thin dense surface layer to overcome the stability problem. The production of single and two-layered porous ceramic structures for aerostatic bearing applications have been investigated using the free-capsule hot isostatic pressing process, and in conjunction with slip and tape castings. The influence of various process parameters on open porosity, and the empirical relationships between porosity, particle size and the resulting fluid flow and structural properties were determined from experimental data. The measurement accuracy and uniformity of temperature within the furnace are identified as the most important factors affecting consistency and predictability of the permeability of the porous substrate. Prototype bearings were produced and tested, based on the above materials. The single-layer bearing was, not unexpectedly, found to be unstable over a wide operating range. The use of a two-layeredb earingm ateriale liminatedth e stabilityp roblem. Initial measurements of the slip coefficient of the porous material in air and at small gaps indicated significant deviation from the Beavers' theory. The effect of velocity slip was found to be significant in both test bearings, and was allowed for by the addition of an equivalent clearance to the bearing gap. The value of the equivalent clearance was deduced from experimental data. The static load characteristics and the pressure profile of both test bearings agreed well with published theories, once the above-mentioned correction for slip was applied.

The aim of the Master’s Degree: Ceramic Technology was to produce an innovative body of ceramic work, personal in concept, with reference to South African indigenous ceramics. The main objectives focused on investigating and developing handbuilt forms, a variety of surface decoration techniques and firing methods derived from and inspired by our diverse cultural heritage. Various clay bodies were also developed to construct an innovative range of hand-built and slip cast ceramic products/artefacts, mainly vessels. The investigation included the development of an improved clay body for hand-built pots suitable for alternative firing methods incorporating a variety of surface techniques. The research undertaken for the M-Tech celebrates and expatiates technological data on the techniques and traditional approaches of handbuilt ceramics especially as practised by rural potters in designated areas chosen by the researcher. Relationships developed through visits during these investigations established comfortable working relationships, making the exchange of information possible. As a result, the knowledge and skills gained by the researcher has placed her in a position to enable her to address the needs of the rural community when required, creating opportunities for cross-cultural exchange. Parallel to this investigation was a study directed at developing appropriate ceramic surfaces based on European lace. Various techniques of embossing, incising, sprigging, impressing and glazing were explored to simulate European lace. The idea was to combine the design and construction of hand-built rural crafts in the development of a series of pit-fired ceramic pots. This resulted in a true integration of European and African traditions in the design and development of a body of uniquely South African products. / E. Hön R. Wessels

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