Now showing items 1-10 of 11
A modelling approach for determining the freshwater requirements of estuarine macrophytes.
Increased abstraction of water in the catchment results in a reduced or altered pattern of river flow and this holds serious consequences for the downstream estuarine ecosystem. In South Africa this is a serious concern ...
Amplitude-shape method for the numerical solution of ordinary differential equations.
In this work, we present an amplitude-shape method for solving evolution problems described by partial differential equations. The method is capable of recognizing the special structure of many evolution problems. ...
Polynomial approximations to functions of operators.
To solve the linear equation Ax = f, where f is an element of Hilbert space H and A is a positive definite operator such that the spectrum (T (A) ( [m,M] , we approximate -1 the inverse operator A by an operator V which ...
On purity relative to an hereditary torsion theory.
The thesis is mainly concerned with properties of the concept "σ-purity" introduced by J. Lambek in "Torsion Theories, Additive Semantics and Rings of Quotients", (Springer-Verlag, 1971). In particular we are interested ...
Graph and digraph embedding problems.
This thesis is a study of the symmetry of graphs and digraphs by considering certain homogeneous embedding requirements. Chapter 1 is an introduction to the chapters that follow. In Chapter 2 we present a brief survey ...
On chain domains, prime rings and torsion preradicals.
Abstract available in pdf file.
An algebraic study of residuated ordered monoids and logics without exchange and contraction.
Please refer to the thesis for the abstract.
Aspects of distance and domination in graphs.
The first half of this thesis deals with an aspect of domination; more specifically, we investigate the vertex integrity of n-distance-domination in a graph, i.e., the extent to which n-distance-domination ...
Conformally invariant relativistic solutions.
The study of exact solutions to the Einstein and Einstein-Maxwell field equations, by imposing a symmetry requirement on the manifold, has been the subject of much recent research. In this thesis we consider specifically ...
Spherically symmetric cosmological solutions.
This thesis examines the role of shear in inhomogeneous spherically symmetric spacetimes in the field of general relativity. The Einstein field equations are derived for a perfect fluid source in comoving coordinates. ...