Author:Cornell, DH; Schutte, SS; Eglington, BLDate:Jul 1996The Ongeluk lavas form part of the Palaeoproterozoic Transvaal-Griqualand West supracrustal sequence of the Archaean Kaapvaal Craton of South Africa. They form a thick shallow-marine volcanic sequence of pillow lava, massive flows and ...Read more
Author:Patridge, TC; Demenocal, PB; Lorentz, SA; Paiker, MJ; Vogel, JCDate:1997Late Pleistocene variations in rainfall in subtropical Southern Africa are estimated from sediments preserved in the Pretoria saltpan, a 200,000 year-old closed-basin crater lake on the interior plateau of South Africa. This record is one of ...Read more
Author:Salmon, BP; Olivier, JC; Kleynhans, W; Wessels, Konrad J; Van den Bergh, FDate:Jul 2009This paper shows that a feedforward Multilayer Perceptron (MLP) operating over a temporal sliding window of multispectral time series MODerate-resolution Imaging Spectroradiometer (MODIS) satellite data is able to detect land cover change ...Read more
Author:Goliger, Adam M; Milford, RVDate:1998The objective of the present study was to re-visit and up-date data on tornado occurrences throughout the world. This was carried out by accessing the relevant literature, analysing, re-analysing and comparing the data on tornado occurrence ...Read more
Author:Wright, C; Walls, EJ; De J Carneiro, DDate:Jul 2000Analysis of the refracted arrivals on a seismic reflection profile recorded along the wall of a tunnel at an iron mine near Thabazimbi, South Africa, shows variations in P-wave velocity in dolomite away from the de-stressed zone that vary ...Read more
Author:Malan, DFDate:Oct 2002Although hard rock is not usually associated with large creep deformation, data collected from the tunnels and stopes of the deep South African gold mines illustrates significant time-dependent behaviour. Apart from application in mining, a ...Read more
Author:Kleynhans, W; Olivier, JC; Salmon, BP; Wessels, Konrad J; Van den Bergh, FDate:2010A method for detecting land cover change using NDVI timeseries data derived fromMODerate-resolution Imaging Spectroradiometer (MODIS) satellite data is proposed. The algorithm acts as a per pixel change alarm and takes as input the NDVI ...Read more
Author:Scott, DF; Lesch, WDate:10 Dec 1997The reductions in streamflow following the afforestation of grassland with Eucalyptus grandis and Pinus patula in the Mokobulaan research catchments on the Mpumalanga escarpment, and the subsequent response in streamflow to clearfelling of ...Read more
Author:Malan, DFDate:Apr 1999Although hard rock is not usually associated with large creep deformation, significant time-dependent behaviour is observed in the tabular excavations of the South African gold mines. Time-dependent closure data was collected in stopes of the ...Read more
Author:Leigh, L; Helder, D; Behnert, I; Deadman, A; Fox, N; Leloglu, UM; Özen, H; Griffith, DDate:Jul 2011The Tuz Gölü site does demonstrate some challenges for being used as an absolute calibration site. These include: spatial and temporal variability on the order of +/- 0.02, atmospheric transmittance variability on the order of between 0.52 ...Read more