Author:Parmaliana, A; Frusteri, F; Mezzapica, A; Scurrell, MS; Giordano, NDate:07 May 1993Vanadium oxide-silica catalysts can effect the partial oxidation of methane to formaldehyde with extremely high activities and the space time yield (STY) can reach a value in excess of 800 g kg-1cat h-1; bare silica also shows appreciable STY ...Read more
Author:Veldman, CSDate:2003An implementation of the sine-approximation method of ISO 16063-11 (primary vibration calibration by laser interferometry) is described. The quadrature interference signals are generated using an interferometer as described in method 3 of ISO ...Read more
Author:Ilgner, Hartmut JDate:Jun 2016Novel instrumentation has been developed to detect stationary bed conditions for settling slurries by using externally-mounted sensor heads with a heater and a temperature sensor. These heads are configured in such a way that suitable data ...Read more
Author:Ilgner, HJDate:Sep 2014Instrumentation was developed to detect the onset of sliding and stationary bed conditions for settling slurries by using non-invasive, external sensing heads. These heads were configured in such a way that suitable data could be obtained and ...Read more
Author:De Witt, JJ; Van Rooyen, GJDate:Sep 2006Despite the advantages that quadrature mixing offers to radio front-ends, its practical use has been limited due to its sensitivity towards gain and phase mismatches between its in-phase and quadrature channels. DC offsets are also a problem ...Read more
Author:Ikpo, CO; Jafta, CJ; Ozoemena, KI; West, N; Njomo, N; Jahed, N; Baker, PG; Iwuoha, EIDate:Jan 2013Described herein is the electrochemical study conducted on lithium ion battery cathode material consisting of composite of lithium iron phosphate (LiFePO(sub4), iron-cobalt derivatised carbon nanotubes (FeCo-CNT) and polyaniline (PA) nanomaterials ...Read more
Author:Sroor, H; Naidoo, Darryl; Courtial, J; Forbes, ADate:Feb 2018Mathematical self-similar fractals manifest identical replicated patterns at every scale. Recently, fractals have found their way into a myriad of applications. In optics, it has been shown that manipulation of unstable resonator parameters ...Read more
Author:Kakonke, Grace; Tesfaye, Tamrat; Sithole, Bishop B; Ntunka, MDate:Feb 2021South Africa is the biggest chicken meat producer in Southern Africa and generates about 258 million kg of waste feathers. Although some of this waste is beneficiated into animal feed and fertiliser there are problems in adequate digestion ...Read more
Author:Horn, REDate:Oct 1976A method is described by which cotton fabric is treated with phenolicformaldehyde resins and then dyed by immersion in solutions of stabilized salts which couple to the resins.Read more
Author:Edwards, ALDate:31 Aug 2010Noise-induced hearing loss (NIHL) negatively affects the quality of life of mine employees and costs mining companies large amounts in compensation claims. The prevention of NIHL requires early identification and recent evidence about the ...Read more
Author:Shatalov, M; Fedotov, I; Joubert, SVDate:Sep 2008A novel method of function approximation using an initial value, linear, ordinary differential equation (ODE) is presented. The main advantage of this method is to obtain the approximation expressions in a closed form. This technique can be ...Read more
Author:Land, KJ; Mbanjwa, MM; Korvink, JGDate:Oct 2013Microfluidic devices are commonly utilised for the manufacture of particles. In certain applications, cross linkers are required to manufacture these particles, and when introduced in continuous form will foul the microfluidic channels. We ...Read more
Author:Wepener, I; Richter, W; Joubert, ADate:Jan 2010This presentation addresses the replacement and repair of bone. There are four types of biomaterials; namely biotoxic, bioinert, bioactive and ioresorbable. The most abundant inorganic mineral in bone is hydroxyapatite, which is a good candidate ...Read more
Author:Land, K; Schneider, F; Potgieter, S; Korvink, JGDate:Sep 2009Microfluidic systems require numerous control valves in order to function properly. These valves form the basic unit of fluid handling within the microfluidic system. Many different valves have been designed and manufactured, both active and ...Read more
Author:Chikwamba, Rachel K; Lotter, T; Ramesaar, KDate:28 Feb 2006The demand for health products such as protein therapeutics and sub-unit vaccines to control infectious diseases far outweighs the current global production capacity of these molecules. These products are currently being produced in conventional ...Read more