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Showing results 162061 to 162070 of 165988

  1. Predictive policing in an endangered species context : combating rhino poaching in the Kruger National Park
    Koen, Hildegarde Suzanne, 2017-07-13T13:28:50Z, University of Pretoria
    Approximately three rhinos are poached daily in South Africa. Rhino poaching is a serious problem that a ects not only the rhino population of South Africa, but also the rhino population of the world. South Africa has the largest rhino population and of those rhinos the largest number can be found i ...
  2. Local heat transfer coefficient and wall temperature measurements for solar driven system
    Kohlmeyer, Berno Werner, 2017-07-13T13:28:50Z, University of Pretoria
    Several applications, including those in the energy sector that require high thermal efficiency, such as those in the solar energy industry, require a careful thermal analysis of heat exchange components. In this regard, thermal resistance is a major cause of exergy destruction and must be minimised ...
  3. Qualitative analysis of flow patterns : two-phase flow condensation at low mass fluxes and different inclination angles
    Kombo, Rainah, 2017-07-13T13:28:50Z, University of Pretoria
    A great deal of work has been conducted on in-tube condensation in horizontal and vertical smooth tubes. The available literature points to mechanisms governing two-phase condensation heat transfer coefficients and pressure drops, which are directly linked to the local flow pattern for both horizont ...
  4. Characterisation of expandable graphite and its flame retardant abilities in flame retardant systems for polyethylene
    Kruger, Hermanus Joachim, 2017-07-13T13:28:50Z, University of Pretoria
    In the pursuit of lower cost intumescent flame retardant (IFR) systems, the compound expandable graphite (EG) was identified. This compound delivers high flame retardant performance but provides non-uniform thermal shielding when exposed to open flame from below due to negative gravitational effects ...
  5. Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling
    Adewumi, Olayinka Omowunmi, 2017-07-13T13:28:51Z, University of Pretoria
    Microchannels and micro pin fins have been employed for almost four decades in the cooling of microelectronic devices and research is still being done in this field to improve the thermal performance of these micro heat sinks. In this research, the constructal design and computational fluid dynamics ...
  6. Repair welding of carbon steel pipe that has experienced partial graphitization during elevated temperature service
    Kruger, Kristian Johan, 2017-07-13T13:28:51Z, University of Pretoria
    Plain C-Mn steels such as SA-516 Grade 65 are used as steam lines to transport high temperature steam under pressure. Plain carbon steels that are in service at elevated temperatures (typically 400-450°C) for prolonged periods of time (typically in excess of 20 years) may experience an undesirable m ...
  7. Grinding mill circuit control from a plant-wide control perspective
    Le Roux, Johan Derik, 2017-07-13T13:28:51Z, University of Pretoria
    A generic plant-wide control structure is proposed for the optimal operation of a grinding mill circuit. An economic objective function is defined for the grinding mill circuit with reference to the economic objective of the larger mineral processing plant. A mineral processing plant in this study c ...
  8. Exploring the spatial and economic development impacts of the African Growth and Opportunity Act 2000 (AGOA) in Lesotho
    Lekunya, Kelebone, 2017-07-13T13:28:52Z, University of Pretoria
    Rapid and sustainable economic growth and progressive social and spatial development through industrial development, has been a persistent challenge for the Sub-Saharan Africa (SSA). A commonly held "solution" to this challenge has been to provide access of manufactured goods from the SSA-region to ...
  9. Study of flow and heat transfer features of nanofluids using multiphase models : eulerian multiphase and discrete Lagrangian approaches
    Mahdavi, Mostafa, 2017-07-13T13:28:52Z, University of Pretoria
    Choosing correct boundary conditions, flow field characteristics and employing right thermal fluid properties can affect the simulation of convection heat transfer using nanofluids. Nanofluids have shown higher heat transfer performance in comparison with conventional heat transfer fluids. The suspe ...
  10. Plasma gasification of organic waste
    Makaringe, Nkateko Petra, 2017-07-13T13:28:53Z, University of Pretoria
    Four biomass materials, namely peach pips, pine wood, bamboo and Napier grass, and one example of chemical waste, lithium hexafluorophosphate (LiPF6), were studied. The biomass types were selected because they were easily accessible locally. The LiPF6 waste is solidified in poly(methyl methacrylate) ...