Articles by Author: Williams S Ebhota

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  1. Design basics of a small hydro turbine plant for capacity building in sub-Saharan Africa

    Design basics of a small hydro turbine plant for capacity building in sub-Saharan Africa

    This paper presents a simplified design considerations for a propeller hydro-turbine, including tabulated relevant mathematical expressions of operating parameters. In the design calculation, a 2.5 m head and 0.183 m3/s flow rate were used as river data for power of...
  2. Electricity insufficiency in Africa: A product of inadequate manufacturing capacity

    Electricity insufficiency in Africa: A product of inadequate manufacturing capacity

    Energy availability is fundamental and crucial for human survival and for national economic development. Energy consumption per capita of a country or region is a measure of quality of life and industrialisation of a country or region. This to certain...
  3. Functionally graded metal matrix composite by centrifugal casting technique mathematical correlation

    Functionally graded metal matrix composite by centrifugal casting technique mathematical correlation

    The functionally graded materials (FGMs) solidification process has complicated movement phenomena of fluid, solute and heat. These phenomena control the segregation of particles in a molten matrix, interactions of particles with a solidification front and the integration of particles in...
  4. African penguins as predators and prey – coping (or not) with change

    African penguins as predators and prey – coping (or not) with change

    Item type: Journal Article • Journal: South African Journal of Marine Science
    African penguins Spheniscus demersus live in the Benguela and western Agulhas ecosystems off southern Africa. Their numbers decreased throughout the 20th century from at least 1.5 million to about 0.18 million adults, although different regional trends were apparent. They feed...
  5. A note on mortality of seabirds off western southern Africa, October 1985–February 1986

    A note on mortality of seabirds off western southern Africa, October 1985–February 1986

    Item type: Journal Article • Journal: South African Journal of Marine Science
    During the austral spring and summer of 1985/86 Cape cormorants Phalacrocorax capensis deserted nests at each of the six major breeding colonies off South Africa and at the two most populous island colonies off South West Africa. Off South Africa...