M.Sc. (Geology) / Please refer to full text to view abstract

M.Sc. (Zoology) / Please refer to full text to view abstract

From the abstract: In the layered sequence of the Bushveld Complex a number of distinct, but possibly genetically related groups of transgressive, postcumulus, ultramafic and mafic rock are recognised. The main part of this thesis investigates a suite of postcumulus rocks for which the name iron-rich ultramafic pegmatite is proposed. The majority of iron-rich ultramafic pegmatite bodies examined are from the upper critical zone of the layered sequence at Rustenburg Platinum Mines Amandelbult Section, in the northern sector of the western Bushveld Complex. Field relationships imply that the iron-rich ultramafic pegmatites should be considered as an integral feature of the layered sequence, even though they transgress the cumulates. Consequently, this thesis also includes a study of the cumulate sequence at Amandelbult. A second group of postcumulus, ultramafic rocks which is investigated comprises latiniferous ultramafic pipes; the Driekop pipe has been selected as a case­ study. This thesis is presented in four sections, namely, an introduction and verview, and studies on the Driekop pipe, the cumulate sequence at mandelbult and the iron-rich ultramafic pegmatite suite. A new classification scheme of discordant bodies of postcumulus, ultramafic rock in he Bushveld Complex is proposed (see also Viljoen & Scoon, in press). In he scheme presented here, two main varieties of postcumulus, ultramafic rock re recognised, namely, non-platiniferous magnesian dunites and iron-rich ltramafic pegmatites.

D.Phil. / The results of this investigation suggested that fish hatcheries may cause a deterioration in water quality of thereceiving stream. With regards trout hatcheries, two sources of pollution were distinguished. These were tenned normal or continuous hatchery effluent and secondly dam cleaning effluent. The former effluent was of little pollution consequence. The bacterial analyses indicated that faecal bacterial concentrations were largely determined by the concentration of these bacteria already present in the influent water. However, hatcheries can result in an increase in faecal bacterial concentrations downstream. Biological growth potential investigations suggested that both normal effluents and dam cleaning effluents were only slightly enriched in comparison with the influent conditions. Metabolizable nutrient addition to the effluent water was considered to be of little importance. Although the hatchery effluent from trout hatcheries may result in marked disturbances in the aquatic macro-invertebrate fauna, the organism community structures indicated that severe organic pollution was not occurring. The communities of the macro-invertebrates had become almost normalized within 300 m of the hatchery outfalls'. The water chemistry analyses confirmed the biological findings. The suspended material from both trout and carp hatcheries was the most important contributor to pollution. Recommendations included the use of the existing chemical and physical standards of the Water Act of 1956, however that these should be supplement~d by other biological parameters. A distance of 1 km should exist between a trout hatchery and a farm boundary unless effluent treatment is undertaken. Carp dam effluent may have to be treated depending on the water quality of the receiving stream.

M.A. (Geography and Environmental Management) / Water can be regarded as a scarce commodity in South Africa and one cannot rely solely on the discovery of new water resources to meet the ever increasing demands. Water is arguably the most precious resource in South Africa and its proper management in all spheres of activity is imperative ( Middleton and Stern,1987 ). This is no different in the mining industry where a primary consumptive use of water is in the tailings dams and associated return water. Restricted implementation of Government water plans and a series of droughts has forced users of water to optimise their use of water. A key to correct water management of a tailings disposal system on a gold mine lies in accurate and meaningful water balance. To provide an accurate water balance, quantifying the water loss is necessary. The water loss in a tailings system is mainly due to evaporation and interstitial flow. For the purpose of this study, evaporation is dealt with in more detail.

M.Cur. (Professional Nursing) / Grievance procedures form an important instrument by means of which nursing staff can make their grievances known to management, thereby effecting a solution to the problem. Therefore, the way in which grievances are handled form an integral part of the staff duties of a nursing service manager. The effective handling of grievances directly influences the satisfaction of nursing staff, as well as the quality of nursing, and thus productivity. Effective handling of grievances depends on the nursing service manager's knowledge of and abiU ty to utilise grievance procedures. This implies that the nursing service manager should be willing and able to investigate all grievances that she becomes aware of, in a consistent manner. She can only fulfil this responsibility if there is an existing grievance procedure in the hospital, and if this procedure is known to all nursing staff. Utilisation of this procedure only is possible when all staff have access to it. This is ensured by training, which will equip them with knowledge and skills in the execution of grieval1ce procedures. The purpose of this study is to determine whether grievances are being handled effectively by nursing service managers in selected hospitals. A descriptive, exploratory study was done within this context by means of a historical analysis of available literature, including newspaper reports, as well as by case study analyses and interviews with nursing service managers in the selected hospitals. A self-training programme regarding the management of grievances will be developed. Analysis of the data indicates that nursing service managers in the selected hospitals do not handle grievance procedures effectively During interviews the nursing service managers indicated that grievance procedures do indeed exist at the hospitals in the Pretoria Witwatersrand area. However, a degree of uncertainty exist. about the difference between grievance procedures and disciplinary procedures.

M.Sc. (Geography) / Please refer to full text to view abstract

M.Sc. (Geography) / The 1982/1983 drought in the summer rainfall regions of South Africa highlighted the dependence of the agricultural sector as well as the general economy of the country on climatic vagaries. The results as indicated in this dissertation fonn a basis for the development of a yield prediction model for maize in the south-eastern Transvaal. The study consists of two parts, namely:- a) The delimitation of the south-eastern Transvaal into smaller homogeneous rainfall regions. b) An investigation of spatial and temporal rainfall patterns within each region and over the study area as a whole. a) The delimitation of the south-eastern Transvaal into smaller homogeneous rainfall regions: Various methods were investigated for this purpose and T-mode Principal Components Analysis with the subsequent clustering of component scores were found to be the most acceptable. b) An investigation of spatial and temporal rainfall patterns within each region and over the study area as a whole: Various parameters such as rainfall amount~ number of rain-days~ rainfall intensity~ seasonality and variability of rainfall were analysed. The presence of rainfall cycles and absence of linear trends were established. The orographic effect of the Eastern Escarpment on the spatial distribution of rainfall amount, frequency and intensity is clearly shown. Areas where conditions are less suitable for the dry-land cultivation of crops due to factors such as rainfall variability (in excess of 30%), steep slopes and relatively low rainfall intensity, were identified. Significant correlations were found between spring and late summer rainfall of a dry year

M.A. (Clinical Psychology) / The overall aim of this study is to establish whether theories on mate selection apply more to first than to subsequent marriages. In the case of subsequent marriages synthesis of the hypotheses is made more difficult by the lack of available research results on the role of internal factors involved in mate selection. It is reasonable to assume differences between first and subsequent marriages in terms of factors that play a significant role in mate selection. Several theories on mate selection have evolved since the formulation of psycho-analytical theory. Initially attempts were made to find a single factor or principle to explain mate selection and it would seem that in most theories complementarity plays a role in some way or another. Hegel (in Murstein, 1976) was one of the earliest champions of theories emphasizing the :. attraction of opposites. According to him the interaction between two opposites results in a new and more viable entity...

M.Ed. (Didactics) / In this study attention is paid to the use of technical college student evaluators of teaching..Specia! attention is focused on certain factors which influence students in their evaluation of the teaching skills of lecturers. The problem addressed, is the vital role played by vocational training in South Africa as a developing country. In the light of the acute shortage of skilled manpOwer, it is essential that vocational training, as practised at technical colleges, should function optiIllally. Lecturers at technical colleges can play an important role in this resPect and what is needed is a willingness on the part of both lecturers and organisations responsible for vocational training, to optimalise effective teaching and the concomitant successful learning by students. The aim of this study centres round an overview of literature regarding methods of teaching evaluation as applied locally and internationally, the identification of the possible influence of certain factors on the evaluation by students and the e,d:ent 1;0 which these factors apply ~o male and female students of different seniority levels at six technical colleges. In the study of relevant Literature , attention is paid to the aim and function of technical colleges. Certain indicators of effective teaching, as well as teaching evaluation are dealt with and special attention is paid to self evaluation, peer evaluation and evaluation by means of objectives. Evaluation of teaching by students is investigated in depth, together with factors which influence students in" their evaluation of teaching, such as humour, sex of student and lecturer, seniority of students, class siZe, enthusiasm and course content. The research group consists of full-time N4, NS and N6 technical and commercial students at six technical colleges on the witwatersrand and in the Pretoria area. The lecturers teaching these students are evaluated by means of a questionnaire.