The legal status of urban Blacks in South Africa

The article deals with the principles underlying the official policy with regard to urban Blacks in South Africa as formulated by dr. H.F. Verwoerd. The implications of these principles with regard to political processes, citizen rights. Influx control and freehold of land are outlined, and a more comprehensive survey is provided of the issue of Black citizenship in terms of various acts; the non-participation of urban Blacks in the central political process; the influx control system, with reference to the background of the system, the contents of the most Important statutory measures; the modes of possession of fixed property available to urban Blacks; and reference is made to the system of local government as practised In areas inhabited by urban Blacks

Menseregte: Oorsig en uitsig

In this paper an attempt is made to offer a survey of the present dis­ cussion of the issue of human rights. In the first place there is a ref­ erence to the traditional concepts of human rights, viz. the classic liberal, the Marx ist-Leninist (Socialist) and the Third World theories and their (pre-War and post-War) concrete embodiments in international, regional and national contexts. Subsequently the initial negative ap­ proach of the institutionalized churches and their later change in attitude - with special reference to the fundamental shifts in approach - are in­ vestigated. The Calvinist view of human rights is discussed within the framework of the recent debate among Afrikaans academics and politi­ cians. With reference to the viewpoints of Wiechers, Van Rooyen, Stoker, Jonker and Du Toit a version of views about the existence of a biblical framework for human rights is provided. The important publication of the Reformed Ecumenical Synod about the Scriptural grounding as well as its embodiment in a number of concrete human rights is discussed. Finally, some outlines are provided for a further development of the Scripturally founded view of human rights with reference to the Refor- mational ground rule of Reformats semper reformaiida est

The Erpenbeck high frequency instability theorem for ZND detonations

The rigorous study of spectral stability for strong detonations was begun by J.J. Erpenbeck in [Er1]. Working with the Zeldovitch-von Neumann-D\"oring (ZND) model, which assumes a finite reaction rate but ignores effects like viscosity corresponding to second order derivatives, he used a normal mode analysis to define a stability function V(\tau,\eps) whose zeros in $\Re \tau>0$ correspond to multidimensional perturbations of a steady detonation profile that grow exponentially in time. Later in a remarkable paper [Er3] he provided strong evidence, by a combination of formal and rigorous arguments, that for certain classes of steady ZND profiles, unstable zeros of $V$ exist for perturbations of sufficiently large transverse wavenumber \eps, even when the von Neumann shock, regarded as a gas dynamical shock, is uniformly stable in the sense defined (nearly twenty years later) by Majda. In spite of a great deal of later numerical work devoted to computing the zeros of V(\tau,\eps), the paper \cite{Er3} remains the only work we know of that presents a detailed and convincing theoretical argument for detecting them. The analysis in [Er3] points the way toward, but does not constitute, a mathematical proof that such unstable zeros exist. In this paper we identify the mathematical issues left unresolved in [Er3] and provide proofs, together with certain simplifications and extensions, of the main conclusions about stability and instability of detonations contained in that paper. The main mathematical problem, and our principal focus here, is to determine the precise asymptotic behavior as \eps\to \infty of solutions to a linear system of ODEs in $x$, depending on \eps and a complex frequency $\tau$ as parameters, with turning points $x_*$ on the half-line $[0,\infty)$

Product development for play therapy : stimulating children with learning disabilities through the use of their own senses

Published ArticleVarious, multidisciplinary approaches can be used for the treatment of children with learning disabilities (LD). A multidisciplinary approach can include play therapy, remedial therapy, physiotherapy as well as a stimulant medication. The aim of this study was to determine whether there is a difference between children with LD and children without LD in terms of differential-sensitivity. Twenty children that have been diagnosed with LD and twenty children without LD participated in and completed a range of actions such as interacting with a number of objects of different colours, sound stimuli, smell stimuli and a two-touch stimulus. The study found that children with LD have more difficulty in identifying their senses and its functions than children without LD. It could thus be possible that if sensory stimulants were integrated into play therapy mediums, that the unidentified child with LD could be identified earlier in that child's life

Evaluation of genetically fine and fine x strong wool Merinos on irrigated pastures

(South African J of Animal Science, 2000, 30, Supplement 1: 113-114

The heritability of acceptability in South African Merino sheep

Selection for production and reproduction in South African Merino sheep is always combined with selection based on visual appraisal and will, in all probability, remain so for many years to come. Heritabilities for acceptability were estimated using a threshold model to analyse data from two parent Merino studs. Effects included in the analysis were sex, birth status, age of dam and year of birth. An acceptable animal was defined as one that was present in the stud at 18 months of age, implying that such an animal would either be retained or sold for breeding purposes. This provided one threshold and two classes (acceptable or not acceptable). Records from the two studs used comprised 3011 progeny of 31 sires and 6495 progeny of 70 sires. Error variance was taken as unity and heritability estimated as h2 = 4s 2s / 1 + s2s where s 2s is the sire variance. Heritability estimates were 0.210 and 0.448. The results suggest that selection improvement for acceptability is possible, and that breeding values for this trait should be supplied for AI sires. (South African Journal of Animal Science, 2001, 31(1): 13-14

Remote monitoring of pulmonary artery pressures with cardiomems in patients with chronic heart failure and nyha class III: First experiences in the Netherlands

We report the first patient experiences with the CardioMEMS device in the Erasmus MC Thorax Center in the Netherlands. In line with clinical trial evidence, the device is applicable in patients with chronic heart failure in functional New York Heart Association class III with at least 1 admission for heart failure in the past 12 months. CardioMEMS has been shown to be safe and reliable, and effective in reducing the number of hospitalisations for heart failure by guided therapy based on pulmonary artery pressures

Relationship of ewe reproduction with subjectively assessed wool and conformation traits in the Elsenburg Merino flock

Subjectively assessed wool and conformation traits are widely used to select breeding ewes and rams in the sheep industry. Data from a Merino flock that is maintained at Elsenburg Research Farm were used to investigate animal model (co)variance components for ewe reproduction traits with subjectively assessed wool and conformation traits. Ewe reproduction traits were assessed at their first lambing opportunity at two years, or over a three-year period from their lambing opportunities at two to four years old. Relationships of ewe reproduction traits with subjectively measured wool and conformation traits were also investigated. All these traits were heritable, with a range from 0.16 ± 0.03 for topline (TOPL) to 0.64 ± 0.04 for woolly face score (WFS). Genetic correlations of number of lambs born (NLB1) with colour (COL), number of lambs weaned (NLW1) with COL and belly and points (BANDP) and total weight of lamb weaned (TWW1) with COL were negative and significant. Significant genetic correlations of ewe reproduction traits over three lambing opportunities were found between number of lambs born (NLB3) and WFS (0.23 ± 0.11) and between total weight weaned (TWW3) and face cover score (FCS) (-0.33 ± 0.16). Among these traits, the noteworthy favourable genetic correlation between total fold score (TOT) and NLB1 suggested that plainer ewes were more reproductive. This is important for the South African Merino industry as plainer sheep are more desirable because of their faster growth and higher lambing percentages and reduced chances of fly strike. Selection for improved ewe reproduction in Merino sheep thus would not result in marked unfavourable correlated responses in most of these subjective wool and conformation traits.Keywords: Correlations, heritabilit

Transhepatic echocardiography: a novel approach for imaging in left ventricle assist device patients with difficult acoustic windows

Aims A significant proportion of left ventricle assist device (LVAD) patients have very difficult transthoracic echocardiographic images. The aim of this study was to find an echocardiographic window which would provide better visualization of the heart in LVAD patients with limited acoustic windows. ................................................................................................................................................................................................... Methods and results Based on the anatomic relationships in LVAD patients, a right intercostal transhepatic approach was proposed. By using a computer simulator, we searched for the appropriate probe orientation. Further, 15 ambulatory LVAD patients (age 56 ± 15 years, 73% males) underwent two echocardiographic studies: one normal transthoracic echocardiography following the institutional protocol (Echo 1) and a second study which included the transhepatic approach (Echo 2). The two exams were performed by two different sonographers and the results validated by a third observer for agreement. The transhepatic intercostal window was feasible in all patients, with an image quality allowing good visualization of structures in 93%. Precise quantification of the left ventricular (LV) and right ventricular (RV) function was achieved more often in the Echo 2 (10 vs. 3 patients for LV, P = 0.03 and 14 vs. 8 patients for RV, P = 0.04). A significant difference existed also in the quantification of the LVAD inflow cannula flow by pulsed Doppler (11 patients in Echo 2 vs. 3 patients in Echo 1, P = 0.009). ................