How many people are there in winterveld?
ConclusionThe views presented in this paper give an indication of what can be expected from a properly conducted census in Winterveld. Certainly it will indicate a population much smaller than generally expected. Moreover, it brings into the spotlight what could be a general phenomenon: exaggerated informal population levels in South Africa, and, furthermore, it questions the reliability of indirect census survey procedures.
Urbanisation in Africa: lessons for urbanisation in the homelands.

 The author analyzes the socioeconomic and political consequences of urbanization in Africa. Similarities between selected African states and the homelands are investigated with respect to rate of urbanization, adequacy of housing and services, and unbalanced growth. The suitability of Western models and standards for application to Africa's urban development is examined

Modeling of the Plasma-Propellant Interaction
Plasma-propellant interaction for application to an electrothermal gun is studied theoretically. Electrothermal-chemical (ETC) guns are used for enhancement of the ignition and combustion of the energetic propellant. A detailed understanding of the dynamics of the plasma-propellant interaction is considered one of the key elements to the future success of practical ETC gun implementation. A model of the propellant ablation under plasma effect is developed based on the kinetic theory of ablation. The ablation model is coupled with a model of the plasma generation in the capillary discharge that allows calculation of the effective heat flux from the plasma. Calculations are performed for specific experimental conditions in which ablated mass of a double-base and a nitramine composite propellant are studied. An ablation model is used to predict the ablation rate of the propellant for different bulk plasma densities. An effective heat flux from the plasma is found which yields the experimentally determined ablated mass. One representative solution reproduces the experimentally determined ablated mass for the double-base propellant of 5.3 mg via an effective heat flux on the order of 4times108 J/m2s. The effective heat flux that corresponds to the experimentally measured ablated mass is determined for different propellants. Differences in the calculated effective heat flux between different propellants indicate that although heat convection from the plasma is the dominant source of energy, plasma radiation, and the optical properties of the propellants themselves cannot be ignored. The difference in plasma heat flux between propellants can readily be explained by partial absorption of plasma radiation consistent with the optical properties of the propellants