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Browsing by Subject "Scanning electron microscopy"

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Characterisation of coal and chars in fluidised bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Falcon, R Date: Mar 2009 There is currently a gap in the understanding of the morphological transformations experienced by high ash and intertinite-rich coals undergoing conversion to char during atmospheric gasification. In this study, work has been carried to ... Read more
Derivation of the liquidus surface projection for the Al-Pt-Ru system from as-cast samples

Author: Prins, SN ; Cornish, LA ; Boucher, PS Date: 10 Nov 2005 The liquidus surface projection for the Al-Pt-Ru ternary system has been determined based on the micro-structural characterisation of arc-melted alloys. The liquidus surface is dominated by the similarity to RuAl phase, and slopes down to the ... Read more
Direct dating and identity of fiber temper in pre-contact Bushman (Masarwa) pottery

Author: Bollong, CA ; Vogel, JC ; Jacobson, L ; Van der Westhuizen, WA ; Sampson, CG Date: Jan 1993 Several 14C dates have been obtained from the fibre temper in cooking bowls made by the forbears of the Zeekoe River Bushmen (Basarwa), South Africa. Although the temper appears to be burned grass, the Q (13) C values do not match those of ... Read more
Effect of mixture ratios and nitrogen carrier gas flow rates on the morphology of carbon nanotube structures grown by CVD

Author: Malgas, GF ; Arendse, CJ ; Cele, NP ; Cummings, FR Date: Feb 2008 This paper reports on the growth of carbon nanotubes (CNTs) by thermal Chemical Vapour Deposition (CVD) and investigates the effects of nitrogen carrier gas flow rates and mixture ratios on the morphology of CNTs on a silicon substrate by ... Read more
The effects of mercury exposure on the surface morphology of gill filaments in Perna perna (Mollusca: Bivalvia)

Author: Gregory, MA ; George, RC ; Marshall, DJ ; Anandraj, A ; McClurg, TP Date: Jan 1999 This study investigated the possibility that changes in the surface morphology of mussel (Perna perna) gill filaments may be used to indicate the relative toxicity of pollutants in the marine environment. Healthy, adult P. perna were collected ... Read more
Evaluation of chitosan/sisal fiber/polyethylene membranes

Author: Agboola, O ; Fayomi, OSI ; Sadiku, ER ; Ayoola, A ; Mokrani, T ; Mbuli, BS ; Popoola, P ; Perry, Goitseona S Date: Jul 2020 Composites of ternary blend of chitosan/sisal fiber/high density polyethylene, were prepared by using the Rheomixer, followed by hot press, in order to form dense microfiltration membranes. The effective operation of the membranes was tested ... Read more
Image processing towards the automated identification of nanoparticles in SEM images

Author: Botha, Gerda N ; Wessels, Gert JC ; Botha, Natasha ; Van Eden, Beatrice Date: Jan 2019 SEM images are crucial in the characterisation of material properties. These images can be very hard to interpret without any prior knowledge of the material. This paper discusses a pre-processing method for assisting convolutional Neural ... Read more
Laser induced damage threshold on metallic surfaces during laser cleaning

Author: Labuschagne, K ; Pityana, Sisa L Date: Jul 2005 In view of the importance of material degradation during laser irradiation, which can have deleterious effects on mechanical and chemical properties of a component, a study was initiated to determine a threshold at which damage takes place ... Read more
Laser surface alloying (LSA) of aluminium (AA 1200) with TiB2 for hardness improvement

Author: Popoola, AP ; Pityana, Sisa L Date: Oct 2010 The present work deals with the development of Aluminium metal matrix composite (MMC) using TiB2 reinforcement. The aim is to improve the microhardness property of the substrate. The surface of the aluminium was sand blasted to improve its ... Read more
Laser surface alloying of 316L stainless steel with Ru and Ni mixtures

Author: Lekala, MB ; Van der Merwe, JW ; Pityana, Sisa L Date: May 2012 The surfaces of AISI 316L stainless steel were laser alloyed with ruthenium powder and a mixture of ruthenium and nickel powders using a cw Nd:YAG laser set at fixed operating parameters. The microstructure, elemental composition, and corrosion ... Read more
Mechanical and structural properties of fluorine-ion-implanted boron suboxide

Author: Machaka, Ronald ; Mwakikunga, Bonex W ; Manikandan, E ; Derry, TE ; Sigalas, I ; Herrmann, M Date: Sep 2011 Results on a systematic study on the effects of ion implantation on the near-surface mechanical and structural properties of boron suboxide (B6O) prepared by uniaxial hot pressing are reviewed. 150 keV fluorine ions at fluences of up to 5.0 ... Read more
Synthesis of single walled carbon nanotubes by dual laser vaporization

Author: Moodley, MK et al. Date: 27 Feb 2006 Single-walled carbon nanotubes were synthesised by the laser vaporisation of graphite composite targets in a tube furnace. Two pulsed Nd:YAG lasers operating at fundamental (1 064 nm) and 2nd harmonic (532 nm) were combined, focused and ... Read more

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Browsing by Subject "Scanning electron microscopy"

Browsing by Subject "Scanning electron microscopy"

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