Conveners
Oral Presentation
- Frikkie De Beer (Necsa)
Oral Presentation
- Anton du Plessis (CSIR National Laser Centre)
Oral Presentation
- Jakobus Hoffman (Necsa)
Oral Presentation
- Mabuti Jacob Radebe Radebe (Necsa)
Oral Presentation
- Robert Nshimirimana (NECSA)
Oral Presentation
- Lunga Bam (Necsa)
Oral Presentation
- Frikkie De Beer (Necsa)
Mr
Frikkie De Beer
(Necsa)
23/09/2013, 09:50
Oral
Oral Presentation
Necsa's mandate to exploit the usage of radiation and its benefit to mankind is clearly demonstrated by the usage of penetrating radiation (neutrons, X-rays and Gamma rays) in the art of imaging - radiography and tomography. Imaging with neutron radiation at Necsa becomes digital in 1995 with a neutron tomography upgrade in 2003. X-ray tomography becomes available in 2005 but with 1mm focal...
Dr
Anton du Plessis
(Stellenbosch University)
23/09/2013, 10:10
Oral
Oral Presentation
This paper provides an overview of the Stellenbosch University micro Computed Tomography (micro-CT) facility. This includes a description and characterization of the system, using various examples of work completed in the last year for academic and commercial projects. The capabilities of the system are demonstrated and a focus on commercial applications in the manufacturing industry...
Dr
Bruce Rubidge
(WITS)
23/09/2013, 10:30
Oral
Oral Presentation
The Microfocus X-ray Computed Tomography (CT) Facility in the Palaeosciences Centre at the University of the Witwatersrand has been in operation since May, 2012. Details on the facility can be found on its website (www.wits.ac.za/microCT). It is unique amongst microfocus CT facilities in South Africa because of its combination of 320 kV, 225kV rotating, and 225 kV static targets. Each of...
Prof.
José Braga
(University of Toulouse (Paul Sabatier), France)
23/09/2013, 11:30
Oral
Oral Presentation
This presentation announces a new collaborative network called AESOP that strengthens the relationships between South African and European partners. The AESOP multidisciplinary and intersectorial Erasmus Mundus consortium co-ordinated by the University Paul Sabatier-Toulouse 3 (France) and co-coordinated the University of the Western Cape (South Africa) is composed of 11 European and 9 South...
Mr
Justin bradfield
(University of Johannesburg)
23/09/2013, 11:50
Oral
Oral Presentation
Many experiments have sought to recreate the types of damage that would be expected in ancient stone and bone weapon tips. This damage is usually presented as visible fractures or microscopic surface modification. Fatigue tests conducted on bovine bones, however, show the development of internal micro-cracks that result from stress, prior to actual breakage. In this paper I present the results...
Ms
Erin Hutchinson
(School of Anatomical Sciences, University of the Witwatersrand)
23/09/2013, 12:10
Oral
Oral Presentation
The state of development and emergence of the deciduous dentition is fundamental to the accurate estimation of age in paediatric and juvenile individuals. However little is understood about the growth of the immature mandible relative to the development of the deciduous dentition. The aim of the study is to investigate the configuration of the dental crypts relative to the developing deciduous...
Dr
James Brink
(National Museum, Bloemfontein)
23/09/2013, 12:30
Oral
Oral Presentation
During the Middle and Late Pleistocene the extinct Bond’s springbok, Antidorcas bondi, occurred in abundance throughout central southern Africa, from the north-eastern Karoo in the south to southern Zimbabwe in the north. It was unusually adapted to a highly specialised grazing niche, co-existing with other larger-bodied specialised grazers in a facilitating grazing system in highly productive...
Prof.
Ugo Ripamonti
(Bone Research Laboratory, University of the Witwatersrand, Johannesburg)
23/09/2013, 13:50
Oral
Oral Presentation
Paleopathological findings amongst Australopithecinae and early Homo species at the Pleio-Pleistocene boundary are rare and confined to alveolar bone loss in adult individuals and to a suggested case of a pre-pubertal periodontitis in a juvenile Australopithecus africanus specimen. Assessment of the fossilized mandibular fragment SK 45 of the early Homo species Telanthropus capensis, confined...
Dr
Tea Jashashvili
(ESI, WITS)
23/09/2013, 14:10
Oral
Oral Presentation
Two first metatarsals from Dmanisi (D2671, D3442) are analyzed. Early work demonstrated that the Dmanisi lower limb and ankle morphology are similar to modern humans. Less-derived metatarsal morphology, on the other hand, demonstrates similarity to earlier hominins. Here, we analyzed cortical thickness patterns in first metatarsal shafts of African apes and fossil hominins. We ask whether...
Ms
Kimberley Chapelle
(ESI Wits)
23/09/2013, 14:30
Oral
Oral Presentation
Massospondylus carinatus Owen, 1854 is a basal sauropodomorph dinosaur from the Late Triassic to Early Jurassic. It was one of the first dinosaurs ever described and is emblematic of the importance of South African palaeontology to the study of dinosaur evolution. Massospondylus was the dominant large herbivore of its time and is represented by an array of well-preserved specimens....
Ms
Aurore Val
(Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg)
23/09/2013, 14:50
Oral
Oral Presentation
The UNESCO World Heritage Site of the Cradle of Humankind, located 50 km northwest of Johannesburg in the Gauteng Province, is one of the most fossiliferous areas in the world. The dolomitic caves of this region have yielded several hundreds of hominin specimens, as well as several hundreds of thousands of fossilized bones of various extant and extinct mammals, birds, reptiles and fish. These...
Dr
Daniela Handl
(Volume Graphics GmbH)
24/09/2013, 08:30
Oral
Oral Presentation
VGStudio MAX is well-known for the quality of images, especially for 3D renderings. While this talk will show images of variousobjects which have been segmented, quantified, compared, or otherwise analyzed with VGStudio MAX, the focus will be on the analyses and the reliability of the results: How does the software support accuracy and reproducibility of results, and what influence does the user have?
Mr
William Shipman
(University of Johannesburg)
24/09/2013, 08:50
Oral
Oral Presentation
X-ray microtomography provides three-dimensional information about the distribution of minerals within an ore sample and facilitates the three dimensional analysis of packed particle beds. A scanning electron microscope with energy-dispersive X-ray (SEM/EDX) attachment is capable of providing an extremely accurate mineral identification on a polished section of an ore sample. Combining these...
Dr
A du Plessis
(CT Scanner Facility, Stellenbosch University)
, Mr
Stephan le Roux
(CT Scanner Facility, Stellenbosch University)
24/09/2013, 09:10
Oral
Oral Presentation
The paper investigates the combination of micro Computed Tomography (CT) scan technology along with X-ray fluorescence (XRF) to determine the distribution of scheelite minerals in rock drill core samples. The aim is to aid mining industry to easily and efficiently identify scheelite and other ore minerals in rock drill core samples. These results could then be used to calculate the...
Mr
T Majodina
(University of Stellenbosch)
24/09/2013, 09:30
Oral
Oral Presentation
Soils within the vicinity of Vaalputs radioactive waste disposal facility show complex system of chemical and morphological characteristics hosted within a thick dorbank (duricrust) horizon. Many regions within the dorbank horizon are dissected vertically and horizontally by highly laminated vein structures. These veins form between macro peds of the polygonally divided dorbank along possible...
Mr
Glen Nwaila
(Minerals to Metals Initiative, Department of Chemical Engineering, University of Cape Town, Private Bag, Rondebosch 7701, South Africa)
24/09/2013, 09:50
Oral
Oral Presentation
A quartz-pebble auriferous conglomerate from the Witwatersrand gold Province (Carletonville, South Africa) prepared by high pressure grind rolls (HPGR) have been investigated by using three different Micro-focus X-ray tomography systems located in three geographically different places (i.e. NECSA: Radiation Science MIXRAD laboratory, SUN: Central Analytical Facilities CT Scan laboratory and...
Dr
Gérard Subsol
(LIRMM-CNRS)
24/09/2013, 11:50
Oral
Oral Presentation
“Image segmentation” which consists in delineating a Region of Interest is in general a requirement before any analysis of image data. This step is all the more critical as its accuracy may impact the validity of the entire processing pipeline. However, commercial image processing software proposes few tools and most of them are based on quite basic principles as thresholding, region growing...
Mr
Jakobus Hoffman
(Necsa)
24/09/2013, 12:10
Oral
Oral Presentation
Thermal cracking occurs easily in processes that entail a steep temperature gradient and high pressure (like blast furnaces and gasifiers) and merits further investigation since the alteration of the coal structure during these conditions will consequently affect the behavior of the resulting char. The fractures that develop during these initial phases of reaction open up pathways to reaction...
Mr
Jacob Viljoen
(North-West University)
24/09/2013, 12:30
Oral
Oral Presentation
The production of unwanted fines and ultra-fines during the handling and utilization of coal is a serious problem in processes that rely on large or closely sized particles. Degradation of coal occurs at a number of different places within the beneficiation or utilization processes and through a number of different mechanisms, none of which is thoroughly understood. In an effort to gain a...
Mrs
Anina Guelpa
(Department of Food Science, Stellenbosch University)
24/09/2013, 13:30
Oral
Oral Presentation
The staple food of Southern African is milled maize (Zea mays L.). Hard maize is favoured by the milling industry for improved end-product quality and milling yield. Two types of endosperm, vitreous and floury, are present in maize kernel and the predominant type present determines the hardness and milling performance of the maize. A relatively fast and non-destructive method for hardness...
Mr
Ashley Kruger
(University of the Witwatersrand)
24/09/2013, 13:50
Oral
Oral Presentation
The rocks of the Karoo Supergroup of South Africa preserve a vast array of tetrapod fauna, and eight bio zones have been defined after these fauna. The Tapinocephalus Assemblage Zone of the Beaufort Group accounts for many tetrapod fauna, amongst the highest, the Dinocephalia. Recently a well-preserved juvenile Anteosaurus skull was recovered in the Tapinocephalus Assemblage Zone, near...
Dr
Mohamed Yasin Gamieldien
(University of Pretoria)
24/09/2013, 14:10
Oral
Oral Presentation
The retromolar foramen and its associated canal represent a largely under-reported anatomical variation of clinical significance in dentistry. The contents of this canal consist of nerves and blood vessels, which may be exposed during surgical access. Reported clinical consequences of this variation are usually three - local anaesthetic failure, intra-operative haemorrhage and loss of...
Dr
JOB KIBII
(Evolutionary Studies Institute, University of the Witwatersrand)
24/09/2013, 14:30
Oral
Oral Presentation
The discovery of hand bones stratigraphically associated with stone tools at Olduvai Gorge in the 1960 ignited debate about morphological correlates of hominin tool making and tool using. Retention of robust metacarpals was then argued to represent tool-making capabilities. Though stone tools dating as early as 2.6 million years have been discovered, robust hominin metacarpals only appear in...
Mr
William D. Krummeck
(Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch, 7701, Cape Town, South Africa)
24/09/2013, 14:50
Oral
Oral Presentation
Ichnology is the study of traces made by organisms in sediments. Among others, trace fossils may indicate the environmental conditions that influenced the behaviour of the organisms that created the traces. For this reason, some ichnofossils are useful in understanding the survival strategies of organisms after global biological crises such as the mass extinction event that occurred ~252...
Mr
Marc Van den Brandt
(Wits University - Evolutionary Studies Institute)
24/09/2013, 15:45
Oral
Oral Presentation
South Africa is world renowned for its rich palaeontological record, which documents in great detail the evolution of mammals. The lineage closest related to mammals is known as non-mammalian cynodonts and first appears in the period known as the Late Permian, at about 255 Millions years ago. Cynosaurus suppostus is a Late Permian species of cynodont, known only from the Karoo Basin of South...
Mr
Mabuti Jacob Radebe Radebe
(Necsa)
24/09/2013, 16:05
Oral
Oral Presentation
Digital neutron imaging (radiography and tomography) is a powerful non-destructive analytical tool and has demonstrated its importance in industrial and research application worldwide. The standardization process, to certify digital neutron imaging as a standard practice in industry, entails standardized test phantoms to be evaluated. Through the evaluation of the phantoms the spatial...
Dr
Ike Sikakana
(Vaal University of Technology)
24/09/2013, 16:25
Oral
Oral Presentation
Ike Sikakana1, Fikile Vuyolwethu Cawe1 and Muthuhadini Fritz Tshatsinde2
1 Department of Non-Destructive Testing and Physics, Vaal University of Technology,
Private Bag x021, Vanderbijlpark, 1900, South Africa.
2 Department of Metallurgy, Vaal University of Technology,
Private Bag x021, Vanderbijlpark, 1900, South Africa.
Abstract
A Friction Stir Welded Ti-6Al-4V alloy plate is...
