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
Author:Van den Berg, N; Crampton, BG; Hein, I; Birch, PRJ; Berger, DKDate:Nov 2004Efficient construction of cDNA libraries enriched for differentially expressed transcripts is an important first step in many biological investigations. We present a quantitative procedure for screening cDNA libraries constructed by suppression ...Read more
Author:Ngubane, NAC; Gresh, L; Ioerger, TR; Sacchettini, JC; Zhang, YJ; Rubin, EJ; Pym, A; Khati, MDate:Nov 2013Bacterial cell wall components have been previously used as infection biomarkers detectable by antibodies. However, it is possible that the surface of the Mycobacterium tuberculosis (M. tb), the causative agent of tuberculosis (TB), also ...Read more
Author:Barreiro, LB; Henriques, S; Mhlanga, MusaDate:Oct 2009In the last decade, molecular beacons have emerged to become a widely used tool in the multiplex typing of single nucleotide polymorphisms (SNPs). Improvements in detection technologies in instrumentation and chemistries to label these probes ...Read more
Author:Kebede, Mesfin A; Yannopoulos, SN; Sygellou, L; Ozoemena, KIDate:Oct 2017Oxygen-deficient pristine (LMNO) and microwave-treated LiMn1.5Ni0.5O4-d (LMNOmic) cathode materials have been synthesized with modified thermo-polymerization synthesis technique. The XRD, XPS, CV and charge/discharge voltage profile analysis ...Read more
Author:Melchior, SA; Raju, Kumar; Ike, IS; Erasmus, RM; Kabongo, G; Sigalas, L; Iyuke, SE; Ozoemena, KIDate:Feb 2018The energy storage performance of one of the lightest-known MXenes, Ti2CTx (MX) combined with carbon nanospheres (CNS) has been investigated as a symmetric electrode system in an aqueous electrolyte (1 M Li2SO4). The energy storage properties ...Read more
Author:Cauda, EG; Drake, P; Lee, T; Pretorius, CDate:Aug 2014Exposure to crystalline silica in the mining industry around the world is a recognized occupational hazard and miners have the highest rate of silicosis related mortality of any industry. Mining operators are limited in assessing and monitoring ...Read more