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LIMNOLOGICAL MODELLING: SIMULATION OF VERTICAL PROFILES OF TEMPERATURE, DISSOLVED OXYGEN AND NUTRIENTS. I. THEORY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B. Henderson-Sellers --- Department of Civil Engineering, United KingdomIn a body of water, variations occur in all limnological parameters on many time and space scales. Modelling can either be specific - for a selected subset; or can attempt to simulate the gross characteristics of e.g. current, temperature, algal... -
European basket option pricing by maximizing over a subset of lower bounds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: W. Mudzimbabwe --- Department of Mathematics and Applied Mathematics, South Africa K.C. Patidar --- Department of Mathematics and Applied Mathematics, South Africa P.J. Witbooi --- Department of Mathematics and Applied Mathematics, South AfricaIn this paper we derive a lower bound for the price of a European basket option under the Black and Scholes framework. The bound is based on the conditioning method of [L.C.G. Rogers and Z. Shi, The value of an... -
Limits to the use of environmental indices to reduce risk and/or increase yield in the South African anchovy fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JAA De Oliveira DS ButterworthEnvironmental indices that provide short-term predictions of recruitment have the potential to improve the average yield from highly productive resources that sustain recruit fisheries without an associated increase in risk (of resource 'collapse'). This is particularly true for cases where... -
Diet of a guild of geckos in a fragmented, human‐altered African rainforest
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: Lorenzo Rugiero --- F.I.Z.V. (Herpetology), Italy Luca Luiselli --- Centre of Environmental Studies, Italy EdemA. Eniang --- Biodiversity Preservation Center, Nigeria GodfreyC. Akani --- The Rivers State University of Science and Technology, NigeriaThe ecology of gekkonids occurring in African forests is poorly known. In this paper, we analyse the feeding habits of a guild of sympatric geckos at a forest‐plantation mosaic area in south‐eastern Nigeria. Faeces were collected on handling from Hemidactylus... -
Sediment dynamics in the Roman Rock area of False Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Terhorst --- Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia M de Vos --- University of Connecticut, United States C Rautenbach --- Waikato Regional Council, New ZealandThis study investigated sediment dynamics in the Roman Rock area of False Bay, South Africa, by integrating sediment grain size data with hydrodynamic and wave modelling. We examined two significant events: a long-period southwesterly swell in 2008, and a prolonged... -
Delta-shocks and vacuums as flux-approximation limit of solutions to the Aw-Rascle model with time-dependent source
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mengqi Cui --- Department of Mathematics, Yunnan Normal University, P.R. China Shuai Fan --- Department of Mathematics, Yunnan Normal University, P.R. China Yu Zhang --- Department of Mathematics, Yunnan Normal University, P.R. ChinaThe flux-approximation limit of solutions to the Aw-Rascle (AR) traffic flow model with time-dependent source is considered. First, the Riemann problem containing flux perturbation and generalized Chaplygin gas (GCG) pressure is solved. Then, it is proved that, as the flux...