The GEMS project involves a multi-wavelength study of a sample of 60 galaxy groups, chosen to span a wide range of group properties. Substantial ROSAT PSPC observations, available for all of these groups, are used to characterise the state of the intergalactic medium in each. We present the results of a uniform analysis of these ROSAT data, and a statistical investigation of the relationship be...

Background: The Choice on Termination of Pregnancy Act of 1996 (Act 92 of 1996) allows abortions to be legally carried out in South Africa. It is not clear how many people are utilising this service. Mthatha is a poverty-stricken area with a high rate of illiteracy. The available infrastructure, such as roads, health facilities and communication, is poor. Method: This was a retrospective, descr...

As Hall and ion thrusters are scaled to power levels below 300 W to operate on smalland micro-satellites, hollow cathodes must be designed to accommodate the new operating regimes with efficient use of power and propellant. The conclusions of previous cathode scaling efforts by other authors are reviewed, and the importance of heat transfer and orifice processes are emphasized. Performance data...

This article examines care-worker hierarchies in South Africa, notably since the HIV/AIDS pandemic and the structural changes it has brought. The nurses, social workers, home-based care workers and volunteers are mostly women, of varying racial, socio-economic, demographic and educational backgrounds; they work in the public, private, and not-for-profit sectors. Recent changes in care provision...