Articles by Author: A C Brown

Search results for A C Brown

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  1. The use of a sewage sludge as a fertilizer for wheat in a glasshouse pot experiment

    The use of a sewage sludge as a fertilizer for wheat in a glasshouse pot experiment

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Acid soil infertility is a major limiting factor in crop production on soils along the eastern seaboard of South Africa. Invariably this problem is addressed by effectively liming the topsoil with little influence on subsoil acidity. A study was conducted...
  2. A WEIGHTED HARDY'S INEQUALITY AND NONOSCILLATORY DIFFERENTIAL EQUATIONS

    A WEIGHTED HARDY'S INEQUALITY AND NONOSCILLATORY DIFFERENTIAL EQUATIONS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper we determine the exponents α0, α, β0, β for which the Hardy inequality
  3. THE BIWEIGHT OF PAIRWISE FINE P-SPACES

    THE BIWEIGHT OF PAIRWISE FINE P-SPACES

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A class of bitopological p-spaces is defined and it is shown that for pairwise T3½ spaces belonging to this class the biweight cannot exceed the cardinality of the space.
  4. Conformal Mapping of a Gear Domain with One Tooth

    Conformal Mapping of a Gear Domain with One Tooth

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    An alternative approach is given for computing the conformal mapping of a unit disc onto a gear domain with one tooth. By means of this new approach an expression for the first coefficient of the Maclaurin series of the mapping...
  5. Evaluation of the "time factor" and "light factor" methods for estimating daily phytoplankton production at the sea surface

    Evaluation of the "time factor" and "light factor" methods for estimating daily phytoplankton production at the sea surface

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Daily phytoplankton production was estimated at the sea surface in the southern Benguela Current during January, March, April and October 1978 by different methods of calculation. Actual daily production (P24 meas) was obtained from a series of short-term (3—4 h)...
  6. Primary production at two contrasting nearshore sites in the southern Benguela upwelling region, 1977—1979

    Primary production at two contrasting nearshore sites in the southern Benguela upwelling region, 1977—1979

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Phytoplankton biomass and production were measured at two sites in the coastal waters of the southern Benguela upwelling region during 1977—1979. Mean annual biomass for the nearshore euphotic zone was estimated at 80 mg chll a·m−2 and production at 1...
  7. The development and decline of phytoplankton blooms in the southern Benguela upwelling system. 2. Nutrient relationships

    The development and decline of phytoplankton blooms in the southern Benguela upwelling system. 2. Nutrient relationships

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Five drogue studies on phytoplankton bloom dynamics in nutrient-rich newly upwelled water in the southern Benguela provided an opportunity to investigate the applicability of Redfield ratios to coastal upwelling regions. Mean atomic ratios of nutrient utilization and oxygen production (ΔP:ΔN:ΔSi:ΔO),...
  8. The development and decline of phytoplankton blooms in the southern Benguela upwelling system. 1. Drogue movements, hydrography and bloom development

    The development and decline of phytoplankton blooms in the southern Benguela upwelling system. 1. Drogue movements, hydrography and bloom development

    Item type: Journal Article • Journal: South African Journal of Marine Science
    A drogue was placed in a patch of newly upwelled water on five different occasions between 1979 and 1981 in order to follow the temporal sequence of events after upwelling. The drogue moved over distances of 67 – 200 km...