Author:Archibald, S; Scholes, RJDate:2007The savannas of Africa are dominated by deciduous trees and perennial but seasonal grasses. Virtually nothing is known about the factors that trigger the onset of greening, or the time-course of leaf-drop in either of these main plant functional ...Read more
Author:Adedeji, KB; Hamam, Y; Abe, BT; Abu-Mahfouz, Adnan MIDate:Oct 2017Water loss through leaking pipes constitutes a major challenge to the operational service of water utilities. In recent years, increasing concern about the financial loss and environmental pollution caused by leaking pipes has been driving ...Read more
Author:Matebese, Belinda T; Withey, Daniel J; Banda, MKDate:Sep 2020The motion planning for a mobile, autonomous system is solved using the Leapfrog algorithm from optimal control. Numerical optimal control has some advantages for motion planning. Differential constraints can be included in the problem ...Read more
Author:Richardson, DM; Blanchard, RyanDate:Mar 2011One of the environmental concerns associated with producing biofuels from alien plants is the risk of these species becoming invasive. We explored whether insights from commercial forestry and agroforestry could inform strategies to reduce ...Read more
Author:Tuling, S; Dala, L; Toomer, CDate:Dec 2013A numerical and experimental investigation was performed to study the dominant flow structures in the lee side of a cruciform wing–body configuration at supersonic speeds in the + orientation. The wings or strakes are of very low aspect ratio ...Read more
Author:Lundt, M; De Korte, GJDate:Nov 2010Exxaro installed their first ultra fines treatment plant at Leeuwpan Coal mine. The plant is now fully operational and results already
show that the plant has great potential. The plant was designed and installed by DRA. Several challenges ...Read more
Author:Van Niekerk, Lara; Weerts, Steven P; Taljaard, SusanDate:Aug 2019In 1994 South Africa adopted a power-sharing democracy as basis for its political system, and this pluralistic slant also is evident in post-1994 environmental legislation, including that pertaining to the coastal marine environment. ...Read more
Author:Haywood, Lorren K; De Wet, Benita; De Lange, Willem J; Oelofse, Suzanna HHDate:Nov 2019While the waste hierarchy promotes the reuse of waste there currently remains limited reuse of mine waste in South Africa. Overburden, waste rock, tailings and slag are stockpiled or disposed leading to environmental liabilities including ...Read more
Author:Harrison, TDDate:Feb 2001Fish length + or - weight relationships, which describe mathematically the correlation between fish length and weight, are useful for converting length observations into weight estimates to provide some measure of biomass (Froese 1998). In ...Read more
Author:Tlotleng, Monnamme; Pityana, Sisa LDate:Jan 2020A hollow γ-TNB turbine blade was 3D printed in this studying using the –R Optomec LENS machine from the elemental powders of aluminium, niobium and titanium making use of the laser “in situ” alloying approaching. The printed blade was ...Read more
Author:Hugo, S; Naidoo, T; Swart, H; Potgieter, S; Van Rooyen, P; Land, KDate:Mar 2012Optical microscopy is widely accepted as one of the gold standards in disease diagnosis. However, factors such as cost and the need for a trained eye limit the prevalence of such equipment, particularly in resource-limited areas such as rural ...Read more
Author:Woodborne, SDate:Apr 1999This paper discusses an overview of research which was conducted for more than 25 years on dating and isotopes by the Quaternary Dating Research Unit (QUADRU) under the supervision of Dr John. Vogel in Pretoria (South Africa).Read more
Author:Holtman, BDate:Nov 2007Violent times do not call for violent measures but for pragmatic ones South Africans are in need of more compassion not hate.Read more
Author:Wessels, Konrad JDate:Mar 2009There is an urgent need for a quantitative, repeatable measure of land degradation and remote sensing provides the only viable option at a regional to global scale. It is therefore commendable that Bai et al. (2008) attempted to use remote ...Read more
Author:Wen, L; Liang, J; Liu, C-M; Chen, J; Luo, HongzeDate:Nov 2016Spinel Li(sub4)Ti(sub5)O(sub12) has been considered as a promising anode material to substitute graphite in lithium ion batteries (LIBs) for large scale electrical energy storage due to its high safety and long cycling stability. However, the ...Read more
Author:Prasanth, PV; Sivakumar, V; Sridharan, S; Kumar, YB; Bencherif, H; Rao, DNDate:Oct 2009In this paper, researchers present seasonal and nocturnal variations of mesospheric sodium (Na) layer parameters observed over Gadanki (13.5° N, 79.2° E), based on 166 nights during the period from January 2005 to December 2006, for the first ...Read more
Author:Venkataraman, SDate:2008Two laser-radar systems in South Africa offer great potential to characterize the region's atmospheric particulate matter and pollutants. Lasers offer great advantages over conventional light sources in terms of peak power and narrow spectral ...Read more