Rheumatic fever and rheumatic heart disease in Gauteng on the decline : Experience at Chris Hani Baragwanath Academic Hospital, Johannesburg. South Africa

PKBackground: The incidence of rheumatic fever (RF) and its complications has waned over the past three to four decades throughout the Western world, but RF remains a problem in developing countries and in the indigenous populations of some well-resourced countries. A marked decline in children presenting with acute rheumatic fever (ARF) and chronic rheumatic heart disease (RHD) has been observed over the past two decades at Chris Hani Baragwanath Academic Hospital (CHBAH) in southern Gauteng Province, South Africa, which mainly serves the periurban population of Soweto. Objectives: To analyse the observed decline in ARF and RHD, and consider the reasons for the decrease. Methods: Review of children with ARF and RHD captured on a computerised database of all children seen in the Paediatric Cardiology Unit at CHBAH during 1993 - 2010. Results: The records of 467 children with ARF and RHD were retrieved from the database. The majority provided addresses in Gauteng, Soweto and North West Province. The number of children documented to have ARF or RHD declined from 64 in 1993 to 3 in 2010. Onethird of the patients underwent surgery, the majority mitral valve repair. Most of the patients requiring surgery had addresses in parts of Gauteng other than Soweto and other provinces, with relatively few originating from Soweto. Conclusion: The decline in the number of children with ARF and RHD presenting to CHBAH may be attributed to an improvement in socioeconomic conditions and better access to medical care for the referral population over the past two decades

Modeling Pressure-Ionization of Hydrogen in the Context of Astrophysics

The recent development of techniques for laser-driven shock compression of hydrogen has opened the door to the experimental determination of its behavior under conditions characteristic of stellar and planetary interiors. The new data probe the equation of state (EOS) of dense hydrogen in the complex regime of pressure ionization. The structure and evolution of dense astrophysical bodies depend on whether the pressure ionization of hydrogen occurs continuously or through a ``plasma phase transition'' (PPT) between a molecular state and a plasma state. For the first time, the new experiments constrain predictions for the PPT. We show here that the EOS model developed by Saumon and Chabrier can successfully account for the data, and we propose an experiment that should provide a definitive test of the predicted PPT of hydrogen. The usefulness of the chemical picture for computing astrophysical EOS and in modeling pressure ionization is discussed.Comment: 16 pages + 4 figures, to appear in High Pressure Researc

Die ring. In diens van onderlinge sorg.

THE CLASSIS. IN SERVICE OF MUTUAL CONCERNCongregations of the Dutch Reformed Church in South Africa are facing  various challenges which they cannot meet on their own. The classis or presbytery was born in the sixteenth century when reformed congregations also went through very difficult times. Its aim was to help congregations fulfil their needs. Neighbouring congregations that are close enough to understand each other’s needs and able to meet as often as needed, constitute this governing body. It has its roots in the sense of unity and concern that existed between the congregations of the first century. Throughout the history of the classis in the Dutch Reformed Church in South Africa, this same sense of unity and concern about the welfare of the congregations constituted the presbytery. Today it is still an integral part of the church’s organization and can help congregations to fulfil their God-given calling in their own context.Article text in Afrikaan

Congregational boundaries, new church developement and congregational relationships within the Dutch reformed church

In this article it is argued that in any system in which membership of a particular congregation is determined by the members themselves through subjective criteria, the relationship between congregations is influenced detrimentally. Subjective criteria are the opposite of objective criteria such as geographical boundaries or different language groups. The same is true when a congregation is not respected as God’s complete church. Beside this, subjective criteria also question God’s providence and also the essential variety of God given gifts that should be present in the congregation in order to function as a complete and healthy Body of Christ. New church development has to take all this into consideration when churches for different culture and generation groups are planted within the borders of existing congregations. It is, after all, not context that is the norm for the church, but God Himself through his Word and Spirit

On-line moisture measurement of rocks, using microwave techniques

Includes bibliographical references.On-line measurement of the moisture content of process streams in a mineral processing plant is vital for their efficient operation. Although many industrial moisture meters are available, most of these were designed to determine the moisture content of low density, fine grained, uniformly surfaced and low resistance materials. Consequently these meters operate poorly on mineral treatment plants as the measured material, rock, is dense, uneven and consists of mixtures of various minerals. A literature survey revealed that of the many methods available, only three techniques could be used for on-line moisture determination in mineral processing operations.These were microwave attenuation, phase and frequency techniques

High Pressure Insulator-Metal Transition in Molecular Fluid Oxygen

We report the first experimental evidence for a metallic phase in fluid molecular oxygen. Our electrical conductivity measurements of fluid oxygen under dynamic quasi-isentropic compression show that a non-metal/metal transition occurs at 3.4 fold compression, 4500 K and 1.2 Mbar. We discuss the main features of the electrical conductivity dependence on density and temperature and give an interpretation of the nature of the electrical transport mechanisms in fluid oxygen at these extreme conditions.Comment: RevTeX, 4 figure

Factors limiting and preventing emerging farmers to progress to commercial agricultural farming in the King William’s town area of the Eastern Cape Province, South Africa

The aim of the study was to investigate the main limiting factors that prevent emerging farmers from progressing from subsistence to commercial agricultural farming in the Eastern Cape Province. The study was conducted in the King William’s Town area by means of a structured questionnaire survey. A sample of 50 households was drawn from the research area which was chosen owing to its uniqueness with regard to agricultural potential. A descriptive analysis technique was employed to investigate the main limiting factors faced by farming households in migrating towards commercial agricultural markets. The findings demonstrated that the specific limiting factors emerging farmers face are poor physical infrastructure such as poor roads, lack of transportation to the markets from the farms, lack of marketing skills and information, poor market infrastructure, and high transaction costs, insufficient land availability to expand production, lack of agricultural implements to better production, poor production and farm management skills, as well as low education levels which results in an inability to interpret market information to be used in production planning and marketing. The results from the study highlighted that the government has a crucial role to play in increasing market participation of emerging farmers through encouraging group marketing, upgrading of roads to enable smooth accessibility of farmers to output markets and the establishment of local point sales in farming rural areas. Finally the study recommended that government provides planned workshops to all farmers in order to equip them with marketing knowledge.Keywords: Emerging farmer; Constraints; Eastern Cape Province

Assessment of Coastal Governance for Climate Change Adaptation in Kenya

The coastline of Kenya already experiences effects of climate change, adding to existing pressures such as urbanization. Integrated coastal management (ICM) is increasingly recognized as a key policy response to deal with the multiple challenges facing coastal zones, including climate change. It can create an enabling governance environment for effective local action on climate change by facilitating a structured approach to dealing with coastal issues. It encompasses the actions of a wide range of actors, including local governments close to people and their activities affected by climate change. Functioning ICM also offers opportunities for reducing risks and building resilience. This article applied a modified capitals approach framework (CAF), consisting of five “capitals,” to assess the status of county government capacity to respond to climate change within the context of coastal governance in three county governments in Kenya. The baseline was defined in terms of governance relating to the implementation of the interrelated policy systems of ICM and coastal climate change adaptation (CCA). The CAF framework provided a systematic approach to building a governance baseline against which to assess the progress of county governments in responding to climate change. It identified gaps in human capacity, financial resource allocation to adaptation and access to climate change information. Furthermore, it showed that having well-developed institutions, including regulatory frameworks at the national level can facilitate but does not automatically enable adaptation at the county level

The phases of deuterium at extreme densities

We consider deuterium compressed to higher than atomic, but lower than nuclear densities. At such densities deuterium is a superconducting quantum liquid. Generically, two superconducting phases compete, a "ferromagnetic" and a "nematic" one. We provide a power counting argument suggesting that the dominant interactions in the deuteron liquid are perturbative (but screened) Coulomb interactions. At very high densities the ground state is determined by very small nuclear interaction effects that probably favor the ferromagnetic phase. At lower densities the symmetry of the theory is effectively enhanced to SU(3), and the quantum liquid enters a novel phase, neither ferromagnetic nor nematic. Our results can serve as a starting point for investigations of the phase dynamics of deuteron liquids, as well as exploration of the stability and dynamics of the rich variety of topological objects that may occur in phases of the deuteron quantum liquid, which range from Alice strings to spin skyrmions to Z_2 vortices.Comment: 9 pages, 6 figures; v2: fixed typo