Author:Kumar, A; Roy, SK; Burger, H; Majumdar, JDDate:2014The present study concerns an in-depth investigation of the influence of laser surface cladding of Ti-6Al-4V on the microstructure (both the top surface, cross-section and interface), wear resistance, corrosion resistance and bio-activity of ...Read more
Author:Pityana, Sisa L; Baloyi, N; Tlotleng, Monnamme; Popoola, PDate:Apr 2019The advantages of using Nb and Ti-Nb coatings for improving the hardness and corrosion resistance of Ti6Al4V were investigated. It has been reported that Ti6Al4V used in orthopaedic implants tends to release toxic Al and V ions into the ...Read more
Author:Majumdar, JD; Kumar, A; Pityana, Sisa L; Manna, IDate:Sep 2018Implants made of AISI 316L stainless steel enjoy promising position because of their higher strength as compared to polymer based materials, and higher toughness as compared to the ceramic based implant. However, AISI 316L based implants often ...Read more
Author:Erinosho, MF; Akinlabi, ET; Pityana, Sisa L; Owolabi, GDate:Jun 2017To modify the properties of Ti6Al4V alloy, Cu has been added to host an antimicrobial effect in the revised alloy for marine application. The Laser Metal Deposition (LMD) process on the Ti6Al4V alloy and Cu was been investigated for surface ...Read more
Author:Loveday, Philip W; Long, Craig SDate:Nov 2014The ability to measure the individual modes of propagation is very beneficial during the development of guided wave ultrasound based rail monitoring systems. Scanning laser vibrometers can measure the displacement at a number of measurement ...Read more
Author:Akhter, R; Ivanchev, L; Van Rooyen, Corney; Kazadi, BP; Burger, HPDate:2006Samples of aluminium alloy A356 were manufactured by Semi Solid Metals HPDC technology, developed recently in CSIR, Pretoria. They were butt welded in as cast conditions using as Nd: YAG laser. The best metal and weld microstructure were ...Read more
Author:Baloyi, NM; Pityana, Sisa L; Tlotleng, Monnamme; Meacock, C; Popoola, PDate:Dec 2012Laser coating is an advanced coating technology used for improving the surface properties of metal components. The coatings produced are thick, dense, and crack-free with continuous non-porous microstructures having uniform composition which ...Read more
Author:Breytenbach, IJ; Anochie-Boateng, Joseph; Paige-Green, P; Van Rooy, JLDate:Oct 2013Research was undertaken using an innovative three-dimensional (3D) laser scanning tool to study the shape and texture characteristics of road aggregate particles. Aggregate materials used for road construction, including G1 crushed rocks of ...Read more
Author:Michaelis, MM; Forbes, A; Bingham, R; Kellett, BJ; Mathye, ADate:Apr 2008A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African connections. ...Read more
Author:Maboya, ML; Meadows, ME; Reimer, PJ; Backeberg, Bjorn-Christoph; Haberzettl, TDate:Dec 2017The marine reservoir effect is the difference in radiocarbon (14C) between the atmosphere and the marine surface ocean. To overcome the dating errors induced, it is necessary to correct marine 14C ages for this effect. R is the difference ...Read more
Author:Clarke, ML; Vogel, JC; Botha, GA; Wintle, AGDate:01 Sep 2003Infrared stimulated luminescence (IRSL) ages have been obtained from a sequence of sandy colluvial deposits in northern Kwazulu-Natal. Comparison of the IRSL ages on sand-sized, potassium-rich feldspars, with radiocarbon dates on A-horizon ...Read more
Author:Talma, AS; Vogel, JCDate:Mar 1992An oxygen isotope temperature record over a large part of the past 30,000 yr has been obtained for the southern Cape Province of South Africa by combining data on the isotopic composition of a stalagmite from a deep cave with that of a confined ...Read more
Author:Dewar, G; Reimer, PJ; Sealy, J; Woodborne, SDate:Jun 2012In order to calibrate radiocarbon ages based on samples with a marine carbon component it is important to know the marine carbon reservoir correction or ΔR value. This study measured the ΔR on both known-age pre-bomb marine shells and paired ...Read more
Author:Roux, FSDate:2010Stochastic (i.e. random and quasi-random) optical fields may contain distributions of optical vortices that are represented by non-uniform topological charge densities. Numerical simulations are used to investigate the evolution under free-space ...Read more
Author:Roux, FSDate:Mar 2012The statistical distributions of optical vortices or topological charge in stochastic optical fields can be inhomogeneous in both transverse directions. Such two-dimensional inhomogeneous vortex or topological charge distributions evolve in ...Read more
Author:Labuschagnè, J; Molefe, D; Focke, WW; Ofosu, OseiDate:Apr 2019The use of layered double hydroxide (LDH) derivatives as flame retardants for PVC, plasticized with 100 phr diisononyl phthalate (DINP), was investigated. Cone calorimeter results, obtained at a radiant flux of 35 kW m(sup-2), revealed that ...Read more
Author:Ray, Suprakas S; Mosangi, Damodar; Kesavan Pillai, SreejaraniDate:Jul 2018The chemical stability, degradation and penetration ability of pharmaceutically active ingredients in topical formulations are the greatest challenges because of problems with the protection of actives for long times and with delivery. ...Read more
Author:Kesavan Pillai, Sreejarani; Kleyi, Phumelele E; De Beer, Marinda; Mudaly, PreenshaDate:Dec 2020Topical delivery of active ingredients is very challenging because of the complex structure and excellent barrier properties of human skin. Advances in nanotechnology resulted in nanomaterial based delivery systems to augment the skin absorption ...Read more