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  1. A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South Africa J.C. Johnson --- , Republic of South Africa
    The extracting solution and soil were separated by using vacuum filtration, followed by continuous leaching. The procedure was evaluated by spiking five different topsoil samples (having a wide range of physical and chemical properties) with ammonium nitrate and determining the...
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  2. Trends in ethylene management strategies: towards mitigating postharvest losses along the South African value chain of fresh produce – a review

    Trends in ethylene management strategies: towards mitigating postharvest losses along the South African value chain of fresh produce – a review

    Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Bongolwethu P Mabusela --- , South Africa Zinash A Belay --- , South Africa Buntu Godongwana --- , South Africa Namrata Pathak --- , Germany Pramod V Mahajan --- , Germany Patricia M K Mathabe --- , South Africa Oluwafemi J Caleb --- , South Africa
    The management of ethylene during postharvest storage is of critical importance to fresh produce wholesalers and retailers. The management of ethylene is an important determinant of the quality and shelf life of fresh fruit and vegetables. Ethylene blocking action and...
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  3. An evaluation of the innovative potentials of a HIV pilot exploring medical pluralism in rural South Africa

    An evaluation of the innovative potentials of a HIV pilot exploring medical pluralism in rural South Africa

    Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Christopher J. Burman --- , South Africa
    This article reflects on an internal evaluation undertaken to estimate the potentials of a community-university pilot project to be developed into a bonafide innovation that can be applied at scale. The focus of the community-university partnership has been to reduce...
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  4. Stability of Riemann solutions to a class of non-strictly hyperbolic systems of conservation laws

    Stability of Riemann solutions to a class of non-strictly hyperbolic systems of conservation laws

    Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Shiwei Li --- Henan University of Engineering, P.R. China
    This paper is concerned with Riemann problem for a class of non-strictly hyperbolic systems of conservation laws. The two kinds of Riemann solutions including vacuum and delta shock wave are constructed. Under the generalized Rankine-Hugoniot relation and entropy condition, we...
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  5. Concentration and cavitation in the Riemann solution for the relativistic Euler equations with non-ideal isothermal dusty gas

    Concentration and cavitation in the Riemann solution for the relativistic Euler equations with non-ideal isothermal dusty gas

    Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Bencui Shan --- Yunnan Normal University, P.R. China Yanyan Zhang --- Xinyang Normal University, P.R. China Yu Zhang --- Yunnan Normal University, P.R. China
    The phenomena of concentration and cavitation in the Riemann solutions of the relativistic Euler equations with non-ideal isothermal dusty gas are considered. The Riemann problem is solved first, and the solutions consisting of rarefaction waves and shock waves are obtained...
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