Author:Van Wyk, Llewellyn VDate:Oct 2016The construction, operation and maintenance of the built environment is a significant consumer of resources (Edwards 2002:10), many of which are not renewable (inter alia steel, aluminium, clay, cement, aggregates). It is also recognised that ...Read more
Author:Rapulenyane, Nomasonto; Ferg, E; Luo, HongzeDate:Sep 2018In a quest to produce cathode materials for lithium ion batteries that yield high capacities, the Li1.2Mn0.6Ni0.2O2, lithium-manganese rich cathode materials were synthesized via a facile one-pot co-precipitation process with various ratios ...Read more
Author:Lysko, Albert A; Mofolo, MDate:Oct 2014This paper overviews a low-power beam-switched smart antenna. The antenna operates at 2.4 GHz frequency band, has low power consumption (1.5 mW), and is intended for smart world applications in communications and metering. The antenna has ...Read more
Author:Hou, S; Chen, R; Zou, H; Shu, T; Ren, Jianwei; Li, X; Liao, SDate:Jun 2016A novel self-humidifying membrane electrode assembly (MEA) with homemade multifunctional Pt/SnO(sub2)-SiO(sub2)/C as the anode was developed to improve the performance of a proton exchange membrane fuel cell under low humidity. The MEAs' ...Read more
Author:Chauke, VP; Maity, Arjun; Chetty, ADate:Jul 2015Graphene oxide (GO) was functionalized with alpha cyclodextrin (aCD) through a covalent bond to form GO-aCD nanocomposites (NC). GO-aCD NC was further modified with polypyrrole (PPY) to afford an advanced GO-aCD-PPY NC for the removal of ...Read more
Author:Koen, W; Strauss, Hencharl J; Bollig, C; Esser, MJDDate:Sep 2010The authors present a high-power Tm:YLF slab laser double-end-pumped by two 300 W laser diode stacks. The resonator was designed such that the laser emitted at 1890 nm instead of the conventional operating wavelength of 1912 nm. At full ...Read more
Author:Schellhorn, M; Ngcobo, S; Bollig, C; Esser, MD; Preussler, DR; Nyangaza, KDate:Jun 2009The aim is to develop a high-power Tm:YLF slab laser which can be utilized to pump a Ho slab laser. A 68 W Tm:YLF slab laser was recently presented in [1] pumped from one end by a single 6-bar stack delivering ~300 W of pump power. In this ...Read more
Author:Makgopa, K; Ejikeme, PM; Jafta, CJ; Raju, Kumar; Zeiger, M; Presser, V; Ozoemena, KIDate:Jan 2015We present a study on the pseudocapacitive properties of birnessite-type MnO(sub2) grafted on highly graphitized onion-like carbon (OLC/MnO(sub2)). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and ...Read more
Author:Ghoor, Ikraam S; Bezuidenhout, Petrone H; Joubert, Trudi HDate:Sep 2017This paper presents the design of a low-complexity, linear and sub-pF CMOS capacitance-frequency converter for reading out capacitive bacterial bio/sensors in an attempt to create a widespread bio/sensor readout module. The significant design ...Read more
Author:Landman, WA; DeWitt, DG; Lee, D-EDate:Sep 2011The evolution of global sea-surface temperature (SST) anomalies over several months ahead is often relatively predictable. Subsequently employing predicted SST in atmospheric general circulation models (AGCMs) can provide means of generating ...Read more
Author:Engelbrecht, CJ; Engelbrecht, FA; Dyson, LLDate:Jan 2012Mid-tropospheric closed-lows (cold-core cut-off lows and warm-core tropical lows) are important rain producing weather systems for the southern Africa region. Over South Africa, most wide-spread flood events are caused by these systems. It ...Read more
Author:Thomalla, Sandy J; Racault, M; Swart, S; Monteiro, Pedro MSDate:Jul 2015In the Southern Ocean, there is increasing evidence that seasonal to subseasonal temporal scales, and meso- to submesoscales play an important role in understanding the sensitivity of ocean primary productivity to climate change. This drives ...Read more
Author:Van Schoor, Michael; Du Pisani, P; Vogt, DDate:Jul 2006The economic horizons of the two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of ...Read more
Author:Van Schoor, Michael; du Pisani, P; Vogt, DDate:28 Feb 2006The two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of the respective planar ...Read more
Author:Naidoo, Kavendra; Skews, BWDate:Sep 2010Dynamic shock wave reflection generated by a rapidly pitching wedge in a steady supersonic free stream has been studied with numerical simulation previously. An experimental facility was developed for the investigation of these dynamic phenomena ...Read more
Author:Cobbinah, PV; Matizamhuka, W; Machaka, Ronald; Shongwe, MB; Yanabe-Mitaria, YDate:Jan 2021In this study, -TiAl based alloys of composition Ti-46.5Al-%xTa (x = 0.8, 4 and 8 at.%) were fabricated by mechanical alloying and consolidated by spark plasma sintering. The main objective of the study was to evaluate the influence Ta contents ...Read more
Author:Cobbinah, PV; Matizamhuka, W; Machaka, Ronald; Shongwe, MB; Yanabe-Mitaria, YDate:Jan 2021In this study, -TiAl based alloys of composition Ti-46.5Al-%xTa (x = 0.8, 4 and 8 at.%) were fabricated by mechanical alloying and consolidated by spark plasma sintering. The main objective of the study was to evaluate the influence Ta contents ...Read more