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 12 of 12 for “"Energy considerations"”.
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Application of photovoltaic solar energy to medium-scale installations
Although South Africa has significant energy reserves, some 50-60% of the South African population is without access to electricity. Lack of infrastructure is one of the root courses of which energy supply forms an important component. The energy sector is an integral part of the whole economy, and …
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The compressive behaviour of unidirectional carbon fibre reinforced plastic
… of a three dimensional analytical model based on energy considerations, which provides substantial insights into the behaviour of unidirectional composite under compressive load. Strength predictions were made using the results of this three dimensional model and .the finite element analysis of …
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Low energy cooling in multi-storey buildings for hot, arid climates
This thesis discusses passive and low energy cooling strategies and systems in hot arid climates. The choice of a certain strategy, as well as determining the appropriate cooling schemes for such a context becomes of prime importance in developing the optimum energy conscious building design. The …
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Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures
… models, respectively based upon a Paris Law and energy considerations relate the time-to-failure to the propagation of the main microbuckle. For this last model, a good correlation between experimental and theoretical data has been obtained. Finally the influence of the temperature on these …
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Nonlinear Free Surface and Viscous Effects on Underwater Vehicle Maneuvering and Seakeeping
… waves using calculations from first principle energy considerations. While both models provide their own approach to shallowly submerged vehicle motion predictions, each model suffers from its own limiting hydrodynamic modeling assumptions such as linearized free surface boundary conditions, …
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Sustainability consideration in machining of 2½d milled features
… address the financial pressure from increasing energy price and the political pressure from legislation on reduction of environmental impact. The motivation of this research is to reduce the environmental impact caused by high energy demand and consumption on the manufacturing process. This …
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Supercritical Water Gasification of Biomass
Finding new ways to produce renewable energy is among the most important and strategic challenges of technology nowadays. Biomass is one of the ideal candidates for reliable and abundant renewable energy production, since it is largely available, universally distributed and potentially CO2 neutral, …
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The development of Zero-G class underwater robots: unrestricted attitude control using control moment gyros
… feedback control law formulated based on energy considerations of the system’s coupled dynamics. Singularities, redundancy and null motion are discussed in the context of CMGs and a mathematical escapability condition is developed based on the differential geometry of null motion. A …
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Thermal treatment of organic contaminated solids and waste : experiment, model and mass balance
… to provide current information on the processes. Energy components are discussed for cost requirement and safety considerations in thermal treatment applications. It is determined that the heat loss from kiln shell to environment demands the major fraction (56 percent) of the energy requirements …
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Gauge symmetries and charged matter in F-theory
… transitions can be motivated from supergravity considerations. We then illustrate how the transitions manifest themselves in dual F-theory and heterotic models. We also explicitly analyze the duality between the heterotic and F-theory constructions, as the models we consider serve as nontrivial …
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Modeling of Polar Cap Ionospheric Patches and Attendant Plasma Instabilities: Initialization from Data and Parametric Analysis
… of issues such as plasma chemistry and energy considerations and their effects on the plasma background state and evolving plasma irregularities.</li> </ol> <p>The focus of the analytic effort is irregularity development within the F-region of the high-latitude ionosphere and for those …
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Modeling mechanical properties – linking atomistics to continuum
… on: (a) single crystals of low stacking fault energy Co-33%Ni alloys, (b) polycrystalline nano-twinned Ni-x%Co alloys (x = 1, 1.62, 2.9 and 5.6), and (c) equiatomic NiTi shape memory alloys. The reason these materials are chosen as candidates for study is that these materials have very distinct …