Prof.
Hendrik Swart
(University of the Free State)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Since the refinement of the famous Dieke diagram (DD) [1] to include all higher energy levels, not much progress has been made in this field. It is now clear, though, that the purely theoretical methods have still a long way to go to yield the 4fN (or 5fN) energy levels in any accuracy. This is because the new applications, e.g. up- and down-conversion, require energy levels that are ever more...
Dr
Makhamisa Senekane
(Department of Physics and Electronics, National University of Lesotho, Roma, Lesotho)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
The proliferation of data and data analysis has resulted in a need to pay more attention to the security of the the data being analyzed. Different options have been pursued to guarantee privacy of these statistical databases generated. However, most of such options cannot offer guarantee of security of the statistical databases. On the other hand, differential privacy is able to meet such a...
Dr
Martin Kudinha
(CPUT)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
A knowledge of the temperature of leaves is of enormous significance particularly from a plant physiological point of view. A study was conducted under field conditions to evaluate Newton-Raphson iterative method as an alternative approach in the indirect determination of leaf temperature from meteorological data. Three field experiments were performed at two different sites at Cape Peninsula...
Ms
Nokwazi Purity Mphuthi
(Hartebeesthoek Radio Astronomy Observatory: Space Geodesy)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
It is understood from the conical wave picture that Bessel beams may self-heal after certain opaque obstructions, but the extrapolation to transparent phase screens is not self-evident. We demonstrate that self-healing is not guaranteed when the Bessel beam is propagated through transparent obstacles with aberrations but is rather dependent on the strength of the aberrations. Finally we...
Mr
Mogahid Abdelrehman
(University of the Free State)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Luminescence from Bi ions can be useful in obtaining blue to red emitting phosphors using different hosts when excited by ultraviolet light due to efficient conversion to longer wavelengths. The alkali-earth oxide phosphor SrO:Bi offers a potential low-cost alternative to lanthanide-based blue phosphors. SrO powder doped with 0.2 mol% Bi was synthesized by the sol-gel combustion method and...
Ms
Carine Buma
(University of Fort Hare)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
The sun is the primary source of energy on earth as almost all the sources of energy emanate either directly or indirectly from the sun. It is also at the center of the photovoltaic technology in which case, sunlight is directly converted to electricity with the use of solar cells. An in-depth knowledge of the sun and the various factors that affect its intensity are very vital for...
Mr
Shadrach Akinkuade
(University of Pretoria)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Nickel oxide (NiO) thin films were deposited on glass substrates through the sol-gel spin coating technique. Structural, optical and electrical characteristics of the films were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), Uv-vis spectrophotometery and linear four point probe resistivity measurement. The films were found to be...
Mr
Tshifhiwa Madiba
(National Metrology Institute of South Africa)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
This paper describes the methods of characterizing stirred liquid bath at the National Metrology Institute of South Africa (NMISA) in maintenance and dissemination of the international temperature scale of 1990 (ITS-90). In practice, methods of characterizing stirred liquid baths varies from institution to another as well as manufacturer. This results in either over estimation or under...
Mr
Ruan Viljoen
(Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Reconstruction of the phase and amplitude of ultrashort pulses are needed since no detector is fast enough to measure these pulses directly. Many methods to do so exists each with its own set of advantages and disadvantages. The only pulse reconstruction methodology which allows one to reconstruct the electric field at the sample plane in the focus of a collinear pulsed laser source, is the...
Dr
Thabo Letsoalo
(University of Limpopo)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Nanoparticles have been the area of active research in the recent years due to their unique material properties, which distinguish them from the bulk materials due to the high surface atom ratio. Pyrite (FeS2) structures at a nanoscale are considered to be one of few materials for photovoltaics capable of bridging the cost and performance gap of solar batteries. It also holds...
Dr
Kinnock Vundawaka Munthali
(University of Namibia)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Light-emitting diodes (LEDs) are semiconductor devices that emit light in a narrow-band spectrum with wavelengths ranging from the infrared to the ultraviolet. This paper will look at current state of the art of the fabrication techniques and characterisation of LEDs from silicon carbide (SiC). SiC has a wide band gap and high thermal conductivity. These unique properties make SiC an ideal...
Mr
Rorisang Sitoboli
(University of the Witwatersrand)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
A multiple router, low-power mesh wireless network with multi-hopping networking capabilities was developed at the Physics building ground floor. Multi-point data between routers was collected over an extended period of time. This study contributes to the analysis of the data for an anti-theft application, based on the future work of the research 'System Control Applications of Low-power Radio...
Mr
Shane Smith
(Student Member)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Terahertz(THz) radiation is a powerful tool for non-destructive spectroscopy and has the potential of being useful in analysing biological materials. Due to the strong absorption of THz radiation by water, a reflection-based geometry is required when investigating samples in an aqueous medium. Due to the relatively low alignment tolerance in THz time-domain spectroscopy it is preferable to...
Mr
Tresor MATINDI
(University of the Witwatersrand)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The formation of shallow n-type dopants in diamond is one of the major challenges for the electronic application of diamond. n-type behavior in diamond is observed for substitutional phosphorus and nitrogen, with activation energies of ~0.62 and 1.7 eV respectively. It has been theoretically found that the substitution of N-O molecule into the diamond lattice induces a shallow defects below...
Dr
Kessie Govender
(Cape Peninsula University of Technology)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Laser cooling of neutral atoms have opened up a new area of research into ultra-low temperature physics of quantum systems. These systems have shown potential in many areas of quantum information processing, such as single photon sources, entangled photon generation, quantum simulations using cold atoms in optical lattices etc. We describe in this presentation the theory of laser cooling and...
Mr
Ratshilumela Steve Dima
(University of venda)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Doping has found to be one of the most promising method to in increasing photocatalytic activity of various materials. The location and nature of the doping elements strongly affect the structural, electronic and optical properties of TiO2. To tailor the band structure and modify the photocatalytic activity of TiO2 brookite (210) surface, a pair of dopants is selected. Platinum and Nitrogen...
Mr
Tshifhiwa Steven Ranwaha
(University of Venda)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Dye‐sensitized solar cells (DSSCs) have attracted considerable attention in recent years as they offer the possibility of low‐cost conversion of photovoltaic energy. DSSCs use the dye molecules adsorbed on the TiO2 semiconductor in nano architecture with the role of absorbing photon from the sun. The electronic structure and excitation properties of dye sensitizer determine the...
Ms
Mmapula Baloi
(University of the Witwatersrand)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Ge2Sb2Te5 (GST225) is a chalcogenide phase change alloy widely used in optical storage media and electronic memory devices. It has been studied in the past two decades due to its optical and electrical properties driven by fast and reversible structural phase transformation. However, its elastic properties have not been thoroughly investigated. Since thermal...
Hlosani Dube
(Wits Masters Student)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Silicon carbide (SiC) has proven to be the future of Micro-electromechanical systems. Previous research has dwelled on the properties of SiC thin films on Si or silicon-on-insulator substrates and it has been a success in realising the potential of SiC (van Rijn, 2013). However, due to the difficult micromachining process and high density of defects when dealing with the SiC substrate , the...
Dr
Emmanuel Igumbor
(University of Pretoria)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Electrically active induced energy levels in semiconductor devices could be beneficial to the discovery of an enhanced p or n-type semiconductor. N implanted into 4H-SiC is a high energy process that produced high defect concentrations which could be removed during dopant activation annealing. On the other hand, B substituted for silicon in SiC leads to a decrease in the dielectric properties...
Mr
Thendo Emmanuel Nemakhavhani
(University of Johannesburg)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Element analysis as a nuclear activation analysis technique (gamma,x) using photons above the Giant Dipole Resonance and the (gamma,x) reactions is a novel development. In these studies the excited nuclei decay by photon emission and these photons can be detected using time stamped event-by-event data acquisition with multiple gamma detectors. In this way, the resulting spectra can be...
Mr
Ruan Viljoen
(Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Probing the vibrational energy states of molecules can be done by Coherent Anti-Stokes Raman Scattering (CARS) Spectroscopy. Traditionally two or three different laser beams are employed to pump and probe the vibrational spectrum of molecules, probing the molecules one wavelength at a time. With the introduction of a coherent broadband light source it is possible to pump and probe multiple...
Mr
Sekhants'o Lara
(University of the Free State, Department of Physics)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
One of the goals of nanoscience and nanotechnology is to synthesize and manufacture nanodevices that are multifunctional, exceptionally small and sensitive with low power consumption. In the past five decades, numerous investigations resulted in novel nanodevices with applications such as resonators, biosensors, logic devices, transistors, optoelectronics and even in situ biomedical...
Abdu Barde
(The National Institute for Theoretical Physics, School of Physics and Mandelstam Institute for Theoretical Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa.)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Ternary and quaternary chalco-germanates and stannates have a rich structural chemistry. Experimental studies of their nonlinear optical properties have been reported, but there are few published computational studies on their structural, dynamic, electronic and optical properties. In this work, we investigate the structural, dynamic, electronic and optical
properties of...
Ms
Andile Mazibuko
(yes)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Precious metal catalysts, which include the platinum group metals (PGMs), find their way into processes such as in emission control technology. Metal nanoparticles supported on metal oxides are being considered as catalysts in the emission control technology, with the most used catalysts being the Pt and Pt-based catalysts. However, Pd-based catalysts are being developed since they have...
Mr
Lutendo Phuthu
(University of Venda)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Since the effectively increase in the efficiency of dye sensitized solar cells (DSSCs) by O’Regan and Gratzel in 1991, the research in the string of DSSCs has grown rapidly. The preparation of the mesoporous oxide (typically, titanium dioxide) film is a key factor in the optimization of DSSCs because of its enormous influence on the anchoring of dye molecules, and the transfer and separation...
Ms
Tshegofatso Moipolai
(University of South Africa)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Copper Zinc Tin Sulphide (CZTS) thin films are materials of interest for low cost solar cells due to their suitable direct band gap of between 1.4 and 1.5eV, large absorption coefficient of over 104 cm-1, abundance and low toxicity of the elements in the CZTS compound compared to the currently used compounds, such as copper indium selenide (CIS), copper indium gallium...
Mr
Assane Talla
(Nelson Mandela University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Growth of zinc oxide nanostructures using block copolymer templates
A.Talla, S. R. Dobson, Z. N. Urgessa and J. R. Botha
Department of Physics, Nelson Mandela University, P O Box 77000, Port Elizabeth, 6031, South Africa
s217063969@Mandela.ac.za
Keywords: nano template, diblock copolymer, wet etching, zinc oxide nanorods,
Abstract
The growth of ZnO nanorods on a lattice...
Mr
SENZO HLONGWANE
(University Of KwaZulu-Natal)
28/06/2018, 15:00
Track E - Physics Education
Poster Presentation
Open hardware and software are intensively used in academia, for research and teaching due to the affordable costs. Most famous open hardware devices like Arduino and RaspberryPi are fully accessorised with several shields able to perform general tasks. In this work we propose methods to optimise the existing Open-source platforms with non-existing shields which are easy to explain to entry...
Ms
Anneke Erasmus
(Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Ptychography is a lensless imaging technique. Light that is transmitted through a sample is measured. Through iterative algorithms this transmitted light’s relative amplitude and phase is reconstructed. This information can be used to create an image of the sample. In ptychography, sections of the sample are illuminated individually and a diffraction pattern of each section is detected in the...
Mr
Ameeth Sharma
(CSIR)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Since first being reported in 1991 by Huang, optical coherence tomography (OCT) has rapidly progressed into a powerful and widely used imaging technique, more especially in biomedical application. This is due to its non-invasive and non-contact advantages. Recent developments in laser technology and high speed electronics speeds have enable faster and more precise acquisition making it more...
Mr
KYALO Ngesu KITEME
(UNISA)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
In the search for a laser cooling Nano-material a method to use in the laboratory to synthesize a suitable Nano-aluminium silicate is introduced.
The last decade has seen tremendous development in Nano- photonics and laser optical cooling, thus interest in the synthesis and use of laser to cool certain materials has grown too.
The possibility for commercial use of laser in cooling materials...
Mr
Hamza Mohammed
(University of Witwatersrand)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Thermoelectric devices can play a role in efficiently using available energy by converting heat produced by a wide range of devices into electricity. Low lattice thermal conductivity is a requirement for efficient thermoelectric devices and layered materials offer potential in reducing the lattice thermal conductivity perpendicular to the layers. We present
density functional theory...
Mr
Mbulunge Masevhe
(University of the western cape)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The magnetic properties and magnetocaloric effect (MCE) of the tenary intermetallic NdPd2Al2 compound have been investigated by means of X-ray diffraction (XRD), magnetic susceptibility χ(T), magnetization M(μ0H), isothermal magnetization M(μ0H,T) and MCE measurements. XRD studies indicate a tetragonal crystal structure with space group P4/nmm (No.: 129). The low temperature χ(T) data exhibits...
Mr
Luthando Maqondo
(University of the Witwatersrand)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
The communications systems be-it through free-space or optical fibers have a major potential, the possibility of sending data through multiple channels at the same time, this is called Multiplexing. The free space optical link is studied in this project. We transmit light modes either Laguerre-Gaussian (LG) or Hermite-Gaussian (HG) in the presence of atmospheric noise, turbulence. The...
Mr
George Okyere Dwapanyin
(Laser Research Institute, Dept. of Physics, Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
The interaction of light with any material with refractive index, n, affects not only the amplitude of the transmitted light but also its phase. Accurate determination of the spectral phase of a laser pulse is paramount in various spectroscopic applications. There are many phase measurement techniques such as direct interferometric approaches including Frequency Resolved Optical Gating (FROG)...
Ms
Delphine Mulaba-Kapinga
(University of Johannesburg)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
With engineering properties comparable to those of steel, austempered ductile iron (ADI), commonly used on mines and in structural applications, has high tensile strength, moderate elongation, acceptable wear and corrosion resistances. Its microstructure is made of ausferrite retained austenite and martensite. This could be a result of either a heat treatment process or of micro-alloying. In...
Mr
Zaki Abdalla
(Postgradiuate student)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Migration behavior of selenium (Se) in polycrystalline SiC was investigated using Rutherford backscattering spectrometry (RBS), scanning electron microscopy (SEM) and Raman spectroscopy. Se ions of 200 keV were implanted into polycrystalline SiC samples to a fluence of 1×10^16 cm-2 at room temperature. Some of the implanted samples were annealed in temperature ranging from 1000 to 1500 oC in...
Mr
Alfred Odirile Mashalane
(UFS)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Optical and structural properties of Y2SiO5:Ce thin films prepared by spin coating.
A Mashalane, HC Swart and MM Duvenhage
Y2SiO5:Ce is a blue emitting phosphor that is used in field emission displays (FED). In this study thin films of Y2SiO5:Ce was prepared by spin coating and their luminescent and structural properties were compared to that of commercially available Y2SiO5:Ce...
Mr
Jonathan Pinnell
(University of the Witwatersrand)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Quantum Key Distribution (QKD) has received a lot of attention from the cryptographic community since it's inception in the early 1970s, owing to it's ability to be provably secure. Unlike classical key distribution, whose security relies on the inability of current computers to efficiently solve certain difficult mathematical problems, QKD's security is based on the laws of quantum mechanics....
Mr
Robert Nshimirimana
(NECSA)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
X-ray radiography is a 2-D projection imaging technique that is extensively used for non-destructive investigation of objects. The investigation is performed on the radiographic image produced by a radiography scanning system of which parameters such as degree of collimation, spectrum tailoring and relative distances between source, object and detector can be adjusted. The aim is to arrange...
Ms
Charmaine Sibanda
(Laser Research Institute,Physics Dept,Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Single molecule resolved fluorescence microscopy used in this work relies on a combination of high detection sensitivity and localization with nanometer precision. The detection of individual molecules in single molecule experiments reveals rare events such as photoblinking and photobleaching, which allows accessing of properties that are otherwise hidden in ensemble measurements [1].The...
Prof.
Antoine-Floribert MULABA-BAFUBIANDI
(School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Apart their usages in telecommunication Microwaves have been used in minerals and materials processing. The materials in-outer ward heating mechanism is exploited to improve the reaction mechanism as well as the thermodynamics and process efficiency. This paper discusses findings obtained when soil materials were processed with microwaves either in a pre-treatment stage or in a final process...
Prof.
Hasani Chauke
(University of Limpopo)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Zr-based alloys are aimed for the more severe operating conditions, such as higher burn-up and increased operation temperature, this is due to their good resistance to corrosion and high melting point. Most of these Zr alloys contains Nb as the major alloying element, which is recommended for developing new fuel cladding materials since it is an effective strengthening element. This study uses...
Ms
Marie Louise Umuhire
(University of Kwazulu Natal, School of Chemistry and Physics, Westville Campus, Durban, South Africa)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Quantum key distribution (QKD) is a process of encoding information in quantum carrier such photons that is shared between legitimate users (usually referred to as Alice and Bob) in the presence of an eavesdropper (usually referred to as Eve) [1]. Alice (sender) and Bob (receiver) are connected via two channels namely a quantum channel and classical channel. A quantum channel can be an optical...
Prof.
Trevor Derry
(University of the Witwatersrand)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Hardness measurements of poly-crystalline hexagonal boron nitride (h-BN) ion implanted samples were carried out using the FM-700 (Vickers) micro-hardness tester. Previously, it has been shown that the implantation of h-BN with different ions structurally deforms the irradiated surface layer to cubic-BN nano-particles as revealed by Raman spectroscopy, X-ray diffraction and electron microscopy,...
Mr
Wendall Coenraad
(Stellenbosch University)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
High-resolution 2D profiles or 3D reconstructions of cellular structures are routinely generated using an interferometric technique, Optical Coherence Tomography (OCT . The main advantages associated with OCT are its high resolution and depth of penetration, which are in the micron and millimeter ranges respectively. The main purpose of this research is to investigate the physical mechanisms...
Mr
Nyiku Mahonisi
(University of the Witwatersrand)
28/06/2018, 15:00
Track C - Photonics
Poster Presentation
Solid-state based single photon systems are at the heart of the second quantum revolution. Particularly NV⁻ defects in diamond, due to their emission properties and that they can easily be integrated to current and scalable optical networks. The fluorescence from the excitation of NV defects in diamond has been studied extensively. It has been shown that the excitation of these quantum systems...
Ms
Nyepudzai Charsline Gatsi
(University of the Witswatersrand, African Materials Science and Engineering Network (A Carnegie-IAS Network))
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Zinc oxide is a wide band-gap semiconductor that is considered a good host for rare-earth ions. Nd3+ ions doped into ZnO cause variations to the broad emission band that arises from the intrinsic vacancy, antisite and interstitial defects. The Nd3+ ions give rise to narrow and discrete absorption and emission bands superposed on the broad band. Most of the ZnO:Nd3+ emission reported in the...
Mr
Nadir Saeed
(University of the Free State)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The crystal structure of yttrium oxyfluoride (YOF) samples were investigated for solar cell applications [1]. The oxyfluorides show promising host potential since they combine the main advantages of oxides with fluorides, such as low phonon energy and low probability of multiphoton quenching [2]. YOF samples were synthesized by the hydrothermal and pyrolysis of trifluoroacetate precursor...
Mr
Emad Hasabeldaim
(University of the Free State)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Eu doped ZnO thin films were successfully prepared from sol-gel solution using the spin coating technique. X-ray diffraction confirmed that all the films having a preferential c-axis orientation along the 002 plane, and their degree of orientation decreased with an increasing Eu concentration. The crystallite size was found to be a minimum for the lower Eu content (0.4 mol%) while it first...
Mr
Joshua Khoele
(iThemba LABS)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
In ion irradiation studies, ion beam bombardment is known to cause the formation of defects in thin films. Efforts in ion implantation studies on III-nitride thin films include ion modification of structural properties of the materials in order to induce improvements within the materials. In this work, InGaN and InAlN thin films, 20 nm thick grown on sapphire with GaN buffer layer, were...
Mr
Nemufulwi Murendeni
(University of free state)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Spinel ferrite nanomaterials have attracted a lot of attention in chemical gas sensing due to their tuneable electronic and magnetic properties through the variation of cation distribution. Cation distribution, structural morphologies and particle size has become of great interest in gas sensing as they enhance the sensing properties of spinel ferrites. Morphological control heavily depends on...
Mrs
Divya Janardhana
(Department of Physics, University of the Free State, Bloemfontein, ZA-9300, South Africa)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Barium aluminate (BaAl2O4) belongs to the spinel group of minerals. The BaAl2O4 exhibits high thermal, chemical stability, hydrophobic behavior, low sintering temperature and high quantum yields. It is a wide-band gap semiconductor, which occurs naturally as the mineral gahnite. Furthermore, BaAl2O4:Nd phosphor material can be used as transparent conductor, scintillators and optical material....
Prof.
Hasani Chauke
(University of Limpopo)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The Fe-Al based systems have recently attracted a lot of attention in various industries for future development of steels due to their excellent resistance to oxidation at high temperatures. These systems suffer from limited room temperature ductility and a sharp drop in strength above 600<0>0</0>;C. The FeAl alloys are regarded as promising material for construction and...
Mr
KAGISO J LEBURU
(NELSON MANDELA UNIVERSITY)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Telescope array networks rely on highly stable clock tones distributed over optical fibre to each antenna for driving the digitizers, data time stamping and other monitoring and control functions. However, optical clock tones suffer from time deviation from their true periodicity, known as jitter. Jitter is contributed by noise, thermal effects and aging of clocks. In the case of buried and...
Dr
Mpho Sithole
(Sefako Makgatho Health Sciences University)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Schottky barrier diodes (SBDs) are a basic structure for semiconductor characterization. Aluminium (Al) SBDs were fabricated on Te-doped n-type Gallium Antimonide (GaSb) using electron beam deposition system. The electrical transport properties of Al/n-GaSb semiconductor material have been investigated. Current-voltage (I-V) and capacitance-voltage (C-V) characteristics of Al/n-GaSb Schottky...
Mr
Vusani Muswa Maphiri
(Sefako Makgatho Health Science University)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Barium aluminates (BaAl2O4) are an important class of materials of the alkaline earth aluminates. BaAl2O4 phosphors are known for their high emission intensity and long afterglow. In this study, the emission from the BaAl2O4 is being further optimized by introducing Cu2+ ions within the host matrix. Hear it is shown that BaAl2O4 has an optimum emission, when doped with 0.075% Cu2+ and excited...
Prof.
R. E. Kroon
(University of the Free State)
28/06/2018, 15:00
Track E - Physics Education
Poster Presentation
A well known result of special relativity is that an object, moving with constant speed away from an inertial observer, has its proper length along the direction of observation reduced due to the Lorentz contraction. Although some might describe this effect as the relativistic length transformation, a more appropriate use of this term could apply to how the observed length of the object...
Mr
Elkana Rugut
(Elkana Rugut University of the Witwatersrand, Johannesburg.)
28/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Thermoelectric materials can convert heat into electricity and thermoelectric devices can play an important role in the efficient use of energy. In this study, we investigate the thermoelectric properties of hard glassy spinel mineral CdGa2O4. The potential of a material to be a candidate as the active component of a thermoelectric device is captured in the figure of merit, ZT, which includes...
Mr
Thendo Emmanuel Nemakhavhani
(University of Johannesburg)
28/06/2018, 15:00
Track F - Applied Physics
Poster Presentation
Traditional diamond mining methods require the use of vast amounts of water and energy to process mostly barren rock to recover diamonds. The crushing of rock can lead to diamond breakage reducing the profitability of a mine. PET sensor technology negates these undesirable effects by enabling the early detection of relatively unprocessed diamond bearing rocks which can be isolated and...
