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Browsing School of Science by Issue Date

Browsing School of Science by Issue Date

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  • Greatest common dwisors and least common multiples of graphs 
    Saba, Farrokh (1991-11)
    Chapter I begins with a brief history of the topic of greatest common subgraphs. Then we provide a summaiy of the work done on some variations of greatest common subgraphs. Finally, in this chapter we present results ...
  • On factorization structures, denseness, separation and relatively compact objects 
    Siweya, Hlengani James (1994-04)
    We define morphism (E, M)-structures in an abstract category, develop their basic properties and present some examples. We also consider the existence of such factorization structures, and find conditions under which they ...
  • Aspects of bivariate time series 
    Seeletse, Solly Matshonisa (1994-11)
    Exponential smoothing algorithms are very attractive for the practical world such as in industry. When considering bivariate exponential smoothing methods, in addition to the properties of univariate methods, ...
  • A comparative study of permutation procedures 
    Van Heerden, Liske (1994-11-30)
    The unique problems encountered when analyzing weather data sets - that is, measurements taken while conducting a meteorological experiment- have forced statisticians to reconsider the conventional analysis methods and ...
  • Compactness in categories and its application in different categories 
    Thulapersad, Sarah (1994-12)
    In the paper [HSS] Herrlich, Salicrup and Strecker were able to show that Kuratowski / Mrowka's Theorem concerning compactness for topological spaces could be applied to a wider setting. In this dissertation, which is based ...
  • Model selection 
    Hildebrand, Annelize (1995-11)
    In developing an understanding of real-world problems, researchers develop mathematical and statistical models. Various model selection methods exist which can be used to obtain a mathematical model that best describes ...
  • Vooruitberamingsmodelle in die telekommunikasie-omgewing 
    Schoeman, Daniel Frederik (1996-06)
  • 2.2 and 1300 μm observations of a complete sample of southern quasars 
    Chini, R.; Kreysa, E.; Wargau, Walter, 1948- (1997)
    We present 2.2 and 1300 μm data of a complete sample of optically selected southern quasars. All objects have 1300 μm flux densities below ≈ 20 mJy (3σ), except QSO 0448 - 392 which shows a faint signal of ≈ 40 mJy. These ...
  • Non-response error in surveys 
    Taljaard, Monica (1997-06)
    Non-response is an error common to most surveys. In this dissertation, the error of non-response is described in terms of its sources and its contribution to the Mean Square Error of survey estimates. Various response and ...
  • Modellering van afhanklikheid in die lineêre model : 'n meteorologiese toepassing 
    Nieuwoudt, Reina (1997-06)
    As deel van die weermodifikasie-eksperiment in Bethlehem, Suid-Afiika, is 'n reenmeternetwerk geinstalleer, en word die neerslagwaardes R; wat by 43 reenmeterstasies waargeneem is, vergelyk met die waargenome radar ...
  • Structural equation modelling 
    Mohanlal, Pramod (1997-06)
    Over the past two decades there has been an upsurge in interest in structural equation modelling (SEM). Applications abound in the social sciences and econometrics, but the use of this multivariate technique is not so ...
  • A study on the analysis of two-unit redundant repairable complex systems 
    Mohoto, Seth Themba (1998-06)
    Two well-known methods of improving the reliability of a system are (i) provision of redundant units, and (ii) repair maintenance. In a redundant system more units made available for performing the system function when ...
  • Dynamic nuclear polarisation of diamond 
    High, Grant Lysle (1998-08)
    This study is presented in nine chapters as follows: Chapter one reviews the reported literature on the NMR of natural diamond. The NMR signal of diamond consists on a single line at 39 ppm from TMS and two hyperfine ...
  • Aspects of interval analysis applied to initial-value problems for ordinary differential equations and hyperbolic partial differential equations 
    Anguelov, Roumen Anguelov (1998-09)
    Interval analysis is an essential tool in the construction of validated numerical solutions of Initial Value Problems (IVP) for Ordinary (ODE) and Partial (PDE) Differential Equations. A validated solution typically ...
  • Critical concepts in domination, independence and irredundance of graphs 
    Grobler, Petrus Jochemus Paulus (1998-11)
    The lower and upper independent, domination and irredundant numbers of the graph G = (V, E) are denoted by i ( G) , f3 ( G), 'Y ( G), r ( G), ir ( G) and IR ( G) respectively. These six numbers are called the domination ...
  • A simulation study of the effect of therapeutic horseback riding : a logistic regression approach 
    Pauw, Jeanette (1998-11)
    Therapeutic horseback riding (THR) uses the horse as a therapeutic apparatus in physical and psychological therapy. This dissertation suggests a more appropriate technique for measuring the effect of THR. A research ...
  • The queen's domination problem 
    Burger, Alewyn Petrus (1998-11)
    The queens graph Qn has the squares of then x n chessboard as its vertices; two squares are adjacent if they are in the same row, column or diagonal. A set D of squares of Qn is a dominating set for Qn if every square ...
  • Two conjectures on 3-domination critical graphs 
    Moodley, Lohini (1999-01)
    For a graph G = (V (G), E (G)), a set S ~ V (G) dominates G if each vertex in V (G) \S is adjacent to a vertex in S. The domination number I (G) (independent domination number i (G)) of G is the minimum cardinality ...
  • First year physics practicals in distance education in South Africa 
    Cilliers, Johanna Albertha (1999-11)
    Although the merits of practical work in physics are often questioned, it remains part of physics curricula world-wide. In distance education the incorporation of practical work into the curriculum is considerably ...
  • Metaheuristic approaches to realistic portfolio optimisation 
    Busetti, Franco Raoul (2000-06)
    In this thesis we investigate the application of two heuristic methods, genetic algorithms and tabu/scatter search, to the optimisation of realistic portfolios. The model is based on the classical mean-variance approach, ...

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