Articles by Author: Pw Shaw

Search results for Pw Shaw

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  1. On the dynamics of the Mauritanian small-pelagic fishery, North-West Africa

    On the dynamics of the Mauritanian small-pelagic fishery, North-West Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Off Mauritania, North-West Africa, a pelagic fishery has operated for more than 30 years, with a recent average annual catch of about 400 000 tons. Catches are influenced by region and by seasonal hydrographic conditions. Yields of carangids (Trachurus trachurus,...
  2. Plantation Forestry in South Africa and its Impact on Biodiversity

    Plantation Forestry in South Africa and its Impact on Biodiversity

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Empirical studies and other evidence indicate that tree farming has had a marked impact on biodiversity in some areas of South Africa, Plant and animal species have been made extinct or are threatened by afforestation, and afforestation is largely responsible...
  3. A Comparison of the kraft pulp properties of P. <em>elliottii</em> and the <em>P. elliottii</em> x <em>P. caribaea</em> var. <em>hondurensis</em> hybrid grown in Queensland, Australia

    A Comparison of the kraft pulp properties of P. <em>elliottii</em> and the <em>P. elliottii</em> x <em>P. caribaea</em> var. <em>hondurensis</em> hybrid grown in Queensland, Australia

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The interspecific hybrid between P. elliottii var. elliottii and P. caribaea var. hondurensis has recently been accepted for planting operationally as an alternative to P. elliottii by Sappi in South Africa. Some concerns have been expressed as to the suitability...
  4. Growth and fibre yield of <em>Pinus patula</em> and <em>Pinus elliottii</em> pulpwood plantations at high altitude in Mpumalanga

    Growth and fibre yield of <em>Pinus patula</em> and <em>Pinus elliottii</em> pulpwood plantations at high altitude in Mpumalanga

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The demand for pine pulpwood in the Mpumalanga province approaches two million tonnes per annum. To meet processor demand for low cost wood, it is important to maximise timber productivity per planted hectare. Selection of species for a site can...
  5. Kraft Pulping Quality of <em>Pinus taeda</em> Reaction Wood

    Item type: Journal Article • Journal: South African Forestry Journal
    Reaction wood, apparently associated with an inherited susceptibility and coincident severe black pine aphid infestations (Cinara cronartii) in 16-year-old, improved Pinus taeda gave low yields of pulp with very poor strength characteristics. This type of wood is considered unacceptable for...
  6. ON THE SPECTRUM OF A SINGULAR HAMILTONIAN SYSTEM

    ON THE SPECTRUM OF A SINGULAR HAMILTONIAN SYSTEM

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper we connect the function-theoretic properties of the matrix Titchmarsh-Weyl M(λ) function with the spectrum of a linear Hamiltonian system. Characterizations are given for the resolvent set, the point spectrum, the continuous spectrum and the point-continuous spectrum. The...
  7. ON THE SPECTRUM OF A SINGULAR HAMILTONIAN SYSTEM, II

    ON THE SPECTRUM OF A SINGULAR HAMILTONIAN SYSTEM, II

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper we connect the pole structure of the Titchmarsh-Weyl m-coefficients with the spectrum of a Hamiltonian system which is singular at each end of an interval. Characterizations are given for the resolvent set, point spectrum, continuous spectrum and...