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Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: N. F. Silulwane A. J. Richardson F. A. Shillington B. A. Mitchell-InnesInformation on the vertical chlorophyll structure in the ocean is important for estimating integrated chlorophyll a and primary production from satellite. For this study, vertical chlorophyll profiles from the Benguela upwelling system and the Angola-Benguela front were collected in winter... -
On the way to Frölicher Lie groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: P.P. Ntumba T.A. BatubengeIn this paper, we start by showing that one can obtain by way of diffeomorphisms some classical smooth curves and surfaces. The notion of bundles is also introduced in the category of Frölicher spaces, and one may carry on investigating... -
On classes of maps with the extension property to the bicompletion in quasi-pseudo metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: SeithutiP. MoshokoaExtensions of CS-regular maps from a dense subset of a metric space to the whole space are discussed in the literature. It is the purpose of this paper to present results on extensions of these maps to the bicompletion in... -
Rademacher Theorem for Fréchet Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Caterina La Russa --- Dipartimento di Matematica ed Applicazioni, ItalyLet X be a separable Frechet space. In this paper we define a class A of null sets in X that is properly contained in the class of Aronszajn null sets, and we prove that a Lipschitz map from an... -
Quotient Maps: Frame-Valued Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. Boustique G. RichardsonIt is known that the category of frame-valued convergence spaces is topological, cartesian-closed and extensional. Properties of quotient maps between objects in this category are investigated here; in particular, it is shown that quotient maps are productive under arbitrary products. -
A method of teaching clinical problem-solving skills to primary health care student nurses
Item type: Journal Article • Journal: South African Family Practice • Authors: A Truscott --- Division of Rural Health, Department of Family Medicine, South AfricaThe article provides a description of a method of teaching a clinical problem-solving process to primary health care nurses/clinical nurse practitioners (PHC nurses). The process was developed in the Soweto PHC Nurse Training Unit over the past 30 years as... -
Journeying into interobjectivity: how worlds can be multiple and real
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Andre Goodrich --- Social Anthropology, School of Social and Government Studies, North-West University, South AfricaThe culture-nature division is fundamental to the division of academic labour between the social and natural sciences. In the face of climate change and other broad environmental threats, natural and social scientists are becoming critical of this division of labour... -
An approach to land capability evaluation for agriculture using remote sensing and GIS in Barberspan, North West Province of South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: T.H. Kabanda --- Department of Geography and Environmental Science, South AfricaTo guarantee food security, job creation and graduate small-scale farmers to commercial farmers, unproductive farms in the North West Province that have resulted from the land reform programme need to be restructured and evaluated for agricultural productivity. This study aimed... -
Exploring the spatial distribution patterns of South African Cape hakes using generalised additive models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Grüss --- Institut de Recherche pour le Développement [IRD], France D Yemane --- Branch: Fisheries Management, South Africa TP Fairweather --- Branch: Fisheries Management, South AfricaWe developed delta generalised additive models (GAMs) to predict the spatial distribution of different size classes of South African hakes, Merluccius capensis and M. paradoxus, using demersal trawl survey data and geographical (latitude and longitude) and environmental features (depth, temperature,... -
Classification of marine bioregions on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T-C Livingstone --- Ezemvelo KZN Wildlife, South Africa JM Harris --- Ezemvelo KZN Wildlife, South Africa AT Lombard --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AJ Smit --- Department of Biodiversity and Conservation Biology, South Africa DS Schoeman --- School of Science and Engineering, AustraliaMarine bioregional planning requires a meaningful classification and spatial delineation of the ocean environment using biological and physical characteristics. The relative inaccessibility of much of the ocean and the paucity of directly measured data spanning entire planning regions mean that... -
Difference equations of a memristor higher order hyperchaotic oscillator
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Karthikeyan Rajagopal --- Center for Nonlinear Dynamics, Ethiopia Anitha Karthikeyan --- Center for Nonlinear Dynamics, Ethiopia Prakash Duraisamy --- Center for Nonlinear Dynamics, EthiopiaA fifth-order chaotic circuit with two memristors is designed with reference to the Chua chaotic oscillation circuit and its corresponding dynamics model is established. The designed memristor hyperchaotic system (Bao, et al. 2011, 2180–2187) is analyzed with its spice model... -
Mapping subtidal estuarine habitats with a remotely operated underwater vehicle (ROV)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Wasserman --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South Africa L Claassens --- Department of Zoology and Entomology, South Africa JB Adams --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaSubtidal habitats have not yet been accounted for in habitat maps of South African estuaries. In this study, a novel method for mapping subtidal estuarine habitats, using a remotely operated underwater vehicle (ROV) piloted from a boat, was developed and... -
Extensions and dilations of module maps
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Massoud Amini --- Tarbiat Modares University, IranWe study completely positive module maps on C*-algebras which are C*-module over another C*-algebra with compatible actions. We extend several well known dilation and extension results to this setup, including the Stinespring dilation theorem and Wittstock, Arveson, and Voiculescu extension... -
A note on J -spaces and relatively connected subsets
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Simo S. Mthethwa --- University of KwaZulu-Natal, South Africa Ali Taherifar --- Yasouj University, IranIn this note we present an investigation of J -spaces and other types of spaces related to J -spaces. We characterise these spaces using the notion of relatively connected subsets. For a completely regular J -space X, we give a... -
Extension of semi-Lipschitz maps on non-subadditive quasi-metric spaces: new tools for Artificial Intelligence
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Roger Arnau --- Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Spain Natalia Jonard-Pérez --- Universidad Nacional Autónoma de México, México Enrique A. Sánchez Pérez --- Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, SpainThe axioms of symmetry and indiscernibility of a metric function can be eliminated and still define a topological space with good enough properties. However, among all the axioms that constitute the notion of a metric, the subadditivity or triangular inequality... -
Some classes satisfying the 2-dimensional Jacobian conjecture and a proof of the complex conjecture until degree 104
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Thuy Nguyen --- São Paulo State Univesity (UNESP), BrazilWe construct a non-proper set of two variables polynomial maps and study the nowhere vanishing Jacobian condition of the Jacobian conjecture for this set. We obtain some classes of polynomial maps satisfying the 2-dimensional Jacobian conjecture for both real and... -
Approximation and Compactness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Colebunders --- Vrije Universiteit Brussel, België R. Lowen --- Universiteit Antwerpen, BelgiëIn approach theory convergence is described by means of limit and adherence operators acting on filters or ultrafilters. The value of the limit resp. adherence operator on an (ultra)filter in a point x is interpreted as the distance that the...