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Minimal change in achievement in high-stakes mathematics examinations in low socio-economic status environments in post-apartheid South Africa
(University of the Free State, 2024-11-03) Nel, B. P.; Julie, C.; Gierdien, F.; Simons, M.; May, B.
Since various curriculum versions have been implemented in the post-apartheid era, achievement results in high-stakes mathematics examinations are still structured along socio-economic status lines. Continuing professional development (CPD) for mathematics teachers is widely viewed as a mechanism to address this issue. This study uses a specific CPD project to explore the question, “Are three decades-long enough to enhance achievement outcomes in high-stakes mathematics examinations for learners from low socio-economic status environments?” Bricolage is employed as the underlying research framework due to the multifaceted nature of CPD. In one of the residential institutes in 2018, a 7-item questionnaire, based on features of effective CPD and containing four ordinal response categories, was administered to 55 participating teachers (30 females and 25 males). To acknowledge the complex nature of CPD, themes were developed and primarily analysed using descriptive statistics. The analysis revealed that, although mathematics teachers respond favourably to practising previously taught material, there are factors that hinder the sustainability of such an approach. It is concluded that 30 years is not a sufficient timespan to expect significant change. It is recommended that drastic measures be taken regarding the continuing professional development of mathematics teachers to address disparities along class and racial lines.
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Penetrating Traumatic Cardiac Injury: Experience in the Current Era from a High-Volume Tertiary Hospital
(2024-03) Koen, Johan Gerhard
Penetrating Cardiac Injury is encountered by most surgeons at some point in their career. Pre-hospital and emergency department risk factors for mortality have been well established. Peri-operative predictive risk factors for mortality in patients undergoing operative room surgery has not been well established. The incidence of post-operative intra-cardiac defects is not known. Early and late mortality outcomes in this patient population in the recent era is not known.
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Structural controls on mineralisation at the Namib Lead and Zinc Mine, Damara Belt, Namibia
(Elsevier, 2018-04) Basson, IJ; McCall, M-J; Andrew, J; Daweti, E
The Namib Lead and Zinc (Pb-Zn) Mine is hosted within the Karibib Formation of the Swakop Group, Damara Sequence. The host marble contains sulphide-rich beds and is locally Pb- and Zn-rich over a strike extent of >100 km. Mining took place in the upper portions of a remobilized MVT or SEDEX orebody, which may occur adjacent to a reactivated major structure. Pb and Zn show locally anomalous copper, tin, indium and fluorine concentrations. Based on the position of gossans, individual orebodies comprise discrete elongate shoots around an antiform and its meso-scale parasitic folds, within calcitic marble. Non-coaxial flattening of the fold-cleavage geometry reflects a series of non-coaxial deformation events, recorded in the Southern Central Zone of the Damara Belt which were superimposed on a NE-SW structural grain and pre-existing fold axial planes. Non-coaxial flattening resulted in further remobilization of sulphides into dilational rhombs which formed from shearing along overlapping axial planar cleavage, in concert with the dilation of banding in the host marble.
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Structural controls on mineralisation at the Namib Lead and Zinc Mine, Damara Belt, Namibia
(Elsevier, 2018-04) Basson, IJ; McCall, M-J; Andrew, J; Daweti, E
The Namib Lead and Zinc (Pb-Zn) Mine is hosted within the Karibib Formation of the Swakop Group, Damara Sequence. The host marble contains sulphide-rich beds and is locally Pb- and Zn-rich over a strike extent of >100 km. Mining took place in the upper portions of a remobilized MVT or SEDEX orebody, which may occur adjacent to a reactivated major structure. Pb and Zn show locally anomalous copper, tin, indium and fluorine concentrations. Based on the position of gossans, individual orebodies comprise discrete elongate shoots around an antiform and its meso-scale parasitic folds, within calcitic marble. Non-coaxial flattening of the fold-cleavage geometry reflects a series of non-coaxial deformation events, recorded in the Southern Central Zone of the Damara Belt which were superimposed on a NE-SW structural grain and pre-existing fold axial planes. Non-coaxial flattening resulted in further remobilization of sulphides into dilational rhombs which formed from shearing along overlapping axial planar cleavage, in concert with the dilation of banding in the host marble.