Mr
Alfred Mogotsi Sehone
(Military Academy)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
In-situ measurements are affected by changes in the geometry of the landscape. Due to these challenges, a dedicated calibration facility is required. The calibration facility is best optimized by making use of a combination of Monte Carlo simulations and a dedicated measurement setup, MEDUSA system. With the simulation, one can optimize the dimensions of the calibration facility, the type of...
Ms
Betony Adams
(UKZN)
26/06/2018, 15:00
Track G - Theoretical and Computational Physics
Poster Presentation
The development of the radical pair mechanism has allowed for theoretical explanation of the fact that magnetic fields are observed to have an effect on chemical reactions. The mechanism describes how an external magnetic field can alter chemical yields by interacting with the spin state of a pair of radicals. Since the inception of quantum biology, there has been interest in the application...
Mr
Valentine Gora
(Mdlands State University)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Schottky barrier diodes (SBDs) made on 4H-SiC have been commercially available for a considerable time but their properties and applications are still not thoroughly understood. Consistent control of metal contact properties is yet to be established so as to optimize reliability. As a result, the inability to physically reproduce the Schottky barrier height is a technologically important...
Dr
OBED SHIRINDA
(iThemba LABS/Stellenbosch University)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
iThemba LABS has purchased a segmented clover detector, a detector that uses the latest achievements in the Ge detectors technology. Contrary to the standard Ge detectors the new detector is segmented on the outer contact, resulting in 8 segments per crystals, or 32 segments for the whole detector. The segments can be run as individual detectors, allowing considerably higher event rates to be...
Mr
Thabo Masuku
(University of the Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
To operate the Tile Calorimeter, the Tile Online software which is a set of Trigger and Data Acquisition (TDAQ) is required for configuration. The modularity and configurability of TDAQ enables it to be used as data acquisition system for test setups, test beams, detector calibration, ect. Partitions which are the starting point that defines a DAQ configuration are created to...
Mr
Jeremiah Monnakgotla
(University of the Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
Background estimation is one of the most important aspects for all the analysis at the Large Hadron Collider. This proceeding presents the background estimation for the $A\rightarrow ZH$ search with the heavy scalar, $H$, decaying into a pair of Higgs, or Madala, $S$, bosons. The final state for this search is formed by 3 leptons, $\geq$~2 $b$-jets and low jet multiplicity. The $t\bar{t}Z$...
Prof.
Chris Theron
(University of Pretoria)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Commissioning of the III-V MBE system at the University of Pretoria has started. Doped GaAs layers have been grown and characterised electrically. The resulting carrier densities were used to determine the doping concentration versus cell temperature parameters that are required for controlled growth.
Dr
Pierre Cilliers
(SANSA Space Science)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
Ionospheric scintillation is known to be caused by rapid variations in the electron density of the ionosphere. It manifests as rapid fluctuations in the amplitude and phase of radio signals traversing the ionosphere. In the case of navigation signals transmitted from satellites of the Global Navigation Satellite System (GNSS) ionospheric scintillation can cause a decrease in the accuracy of...
Dr
Khomotso Maenetja
(University of Limpopo)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
A high energy demand as a result of a growth in living standards and population has stimulated the efforts to develop high energy density power sources which is, metal air batteries. However, the fundamental challenge that limits the use of metal air battery technology is the ability to find a catalyst that will catalyse Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER)....
Mr
Kgwajana Barnard Molala
(UL)
26/06/2018, 15:00
Track G - Theoretical and Computational Physics
Poster Presentation
Compound such as cooperate, braggite, sperrylite and platarsite are important sources of platinum (Pt) and palladium (Pd) in many of the world’s largest deposits of platinum group minerals (PGM). South Africa is major producer of platinum group elements (PGE), therefore research in understanding the surface chemistry and surface reactivity of this platinum group mineral is central to major...
Mr
Bradley Nemutudi
(UL)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The atmospheric oxidation of minerals either by weathering or aging involves physical and chemical adsorption of oxygen on the surfaces and this forms various peroxides and hydroxides. In this study ab-initio computational method was employed to investigate the interaction of oxygen and water molecules at different adsorption sites on the most stable surfaces of NiS2 ...
Dr
Peace Mkhonto
(University of Limpopo)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The hydration of minerals is one of the main processes that occur during mineral processing. These include wet grinding of the ore and during flotation of liberated particles. In this study we employed ab-initio density functional theory to investigate the adsorption of water molecules onto nickel-rich pentlandite (110) surface. We considered three adsorption aspects: Fe-top, Ni-top and...
Dr
Chih-Wei Tsai Tsai
(University of the Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Greenhouse gases, Carbon Dioxide in particular, has been a main concern for climate change. Zeolitic Imidazolate Framework (ZIF), a sub class of Metal Organic Framework (MOFs), is a 3-dimensional nanoparticle consisting of metal ion (Zn2+) and an organic linker (imidazole) with high chemical and thermal stability. The bond angle between the metal and imidazole has the same 145° angle found in...
Mr
Kit Ng
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
Computerised Ionospheric Tomography (CIT) is a technique where multiple measurements from signals modulated when passing through an object, are used as inputs to reconstruct the three-dimensional structure of the object by employing mathematical inversion techniques. In CIT the "object" is the spatial distribution of the electron density composition of the Earth's Ionosphere, i.e., the ionised...
Mr
Drikus Du Plooy
(University of the Free State)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
Gamma-ray binaries are a class of high-mass binary systems, which are distinguished by having spectral energy distributions which peak above 1 MeV. Gamma-ray binaries consist of a compact object, either a neutron star or black hole, orbiting a massive O or B type star. While there is some debate around how the gamma-rays are produced, in two systems, PSR B1259-63 and PSR J2032+4127, the...
Dr
Richard Harris
(University of the Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Nanosized iron-based magnets have attracted a great deal of attention in life-sciences and health-care research where they find use in tissue-specific drug delivery, contrast enhancement agents in magnetic resonant imaging (MRI) and cell separation, among others. To improve the efficiency of these nanoparticles (NPs), a very narrow size distribution centering on a small NP size is required,...
Mr
Michael Ogunbunmi
(University of Johannesburg)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
PrRu4Sn6 is a tetragonal, non-centrosymmetric structure compound [1]. It is isostructural to the extensively studied Kondo insulator CeRu4Sn6 [2, 3, 4] which crystallizes in the YRu4Sn6-type structure with space group I-42m. In this structure, the Pr atom fills the void formed by the octahedral...
Mr
Vusi Malaza
(Stellenbosch University, Faculty of Military Science)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
At the present moment it is well known that detecting fission fragments from a decay of heavy nuclei using silicon detectors comes with two experimental challenges, namely Pulse Height Defect and Plasma delay. The negative effect of the Pulse Height Defect (PHD) is observed when registering the energy of the fission fragment and the one of Plasma Delay (PD) is observed when registering time of...
Dr
Xin Liang Yan
(Shantou university, China)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
It is shown that the original in-depth distribution of composition can be directly obtained by the deconvolution of measured depth profiling data using the MRI (Mixing-Roughness-Information) depth resolution function, as demonstrated for the case that the original depth-concentration distribution is either a smooth function or a square wave function. To overcome the ill-conditioned problem...
Ms
Eva Gnegy
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
Knowledge of thermospheric neutral density, above 200 km altitude, is important for applications such as satellite drag, which give satellite lifetime, and long-term climatic trends such as global warming. We have successfully applied theory (ion momentum equation) to incoherent scatter radar (ISR) data (e.g., EISCAT) to extract the thermospheric neutral density above 300 km. However, ISRs...
Mr
Amos Nhlapo
(University of KwaZulu-Natal)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
In this study, nanoparticles of NixCo1-xFe2O4 (x = 0, 0.1, 0.2, 0.3, 0.8 and 1.0) were produced by glycol thermal process and characterized by several techniques such as XRD, TEM, SEM, FTIR, Mössbauer spectroscopy and magnetization measurements. The as-prepared fine powders show transformation from single- to multi-domain behaviour at a critical particle size dependent on sample chemical...
Dr
Mofuti Mehlape
(University Of Limpopo)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Metal sulphide nanostructures via molecular dynamics (MD) simulations at different temperatures are presented and discussed in order to understand their structure and dynamic properties. Nanostructured metal sulphides have attracted the attention of researchers in the fields of materials science, physics and chemistry. They have enhanced structure and dynamic properties due to their large...
Mr
Ibrahim Omer Abdallah Ali
(The National Institute for Theoretical Physics, School of Physics and Mandelstam Institute for Theoretical Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa.)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Organic-inorganic halide perovskites have recently emerged as promising candidates for low cost, high-efficiency solar cells. In this work, the electronic and optical properties of the lead-free hybrid halide perovskite CH3NH3SnI3 as a solar cell absorber has been investigated using first-principles density functional theory calculations and many body...
Mr
Olatunbosun Nubi Nubi
(University of Limpopo)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
The large band-gap of Titania, and the high recombination of photogenerated charge carriers that limit its overall photocatalytic efficiency, prompted the systematic investigation of copper and silver, doped and codoped, TiO2 nanocatalysts. In the study, four different TiO2 nanopowder species, namely undoped, Cu-doped, Ag-doped and Cu+Ag-doped, were fabricated via the...
Dr
DAWIT WORKU
(Cape Peninsula University of Technology)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
We have analyzed and discussed the hadronic abundances measured in Au-Au, p-p and Pb-Pb collisions at RHIC and LHC experiments using THERMUS. The results were obtained with two particle data tables, and their differences were explained. In particular, the data from the RHIC experiment for Au-Au collisions at 130 GeV and 200 GeV were discussed and analyzed. Similarly, using the preliminary...
Ms
Andile Mazibuko
(yes)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Palladium-based catalyst are being developed as an alternative to the commonly used and high cost platinum catalyst because of their similar electronic configurations, lattice constants and they are cheaper than platinum with a high methanol-tolerance. In this study, first principle density functional theory was used to study the catalytic properties of Pd/TiO2, in particular the...
Mr
THOKOZANE MOSES SITHOLE
(UNIVERSITY OF SOUTH AFRICA)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
Silicon radiation detectors are widely used in high energy and nuclear physics experiments hence they incur radiation damage. This leads to degradations in detector performance which include increases in leakage current, bulk resistivity and space charge concentration. The increase in space charge concentration is particularly damaging since it significantly increases the sensor’s full...
Ms
Gabriel Lefebvre
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
Electrodynamic and dynamic processes mainly control low and equatorial latitude ionospheric electron density changes. The transportation of plasma to high altitudes where recombination rate is lower over the equatorial regions results in the formation of the equatorial ionization anomaly
characterized by enhancement of electron density at approximately 15 degrees latitude on both sides of the...
Mr
Sipho Congolo
(University of Pretoria)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Hematite (Fe2O3) is a promising material that is being studied immensely for its application in solar water splitting. It has attractive properties such as a narrow bandgap that allows for absorption of visible light, earth-abundant and is an easily processable photocatalytic material. In this study, we report hematite thin films prepared by spray pyrolysis on fluorine-doped tin oxide (FTO)...
Ms
Sumari Hattingh
(North-West University)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
A significant fraction of the baryons in galaxy groups and clusters is not locked up in stars and the interstellar medium (ISM), but exists in the form of extended multi-phase gas. The advantage of nearby galaxy groups is that this multi-phase gas can be studied via hot X-ray (≈Hα filaments) via optical emission line observations. Another advantage of groups is that the galaxies' heating...
Mr
Lehlohonolo Koao
(UFS (Qwa Qwa Campus))
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
LiMn2O4 powders were prepared by modified chemical bath method using citric acid solution (CA) a catalyst. The volume ratio (VR) of Li and Mn on LiMn2O4 was kept constant and the volumes of CA were varied. The effect of CA on structure, morphology and optical properties of LiMn2O4 nanostructures were investigated. The VR’s of CA were varied from 1 mL≤ VR ≤120 mL. The X-ray diffraction (XRD)...
Mr
Elie Danien RAJAOBELINA IARILALA
(Wits University)
26/06/2018, 15:00
Track G - Theoretical and Computational Physics
Poster Presentation
Based on a number of features of the LHC data in Run I, that have re-emerged in Run II, the HEP group at Wits formulated a hypothesis. This hypothesis entails the existence of a heavy boson with a mass around twice the mass of the SM Higgs boson and a single scalar with a mass around 150 GeV. Data reported recently displays discrepancies with the SM that are consistent with the decay of a...
Mr
Kyle Webster
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
Cosmic particle flux is significantly higher on-board aircraft than at ground level. The radiation field at aviation altitude is very complex in terms of particle composition and particle energies and as such, the dose assessment is a very difficult task. The dose is usually estimated using numerical codes validated by experimental data. Ground‐level enhancements (GLEs) are sudden, sharp, and...
Mr
maloba matome
(University of South Africa)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Polymer based electronics is an emerging technology that is focused on developing electronic devices using semiconducting polymers that can potentially replace silicon based electronics. Polymer based electronics materials are relatively cheaper to synthesize and are mechanically flexible compared to silicon. Metal-polymer nanocomposites, for example, have distinctive electrical, optical and...
Mr
Joe Taylor
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
The study of ionospheric disturbances and irregularities is beneficial to both the scientific advancement of knowledge as well as the practical applicability to high frequency (HF) communications, navigation, surveying and understanding various aspects of space weather effects on technological systems. Studies have shown that ionospheric disturbances have characteristic features, such as...
Ms
Katekani Shingange
(CSIR/UFS)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Lanthanum (La) based perovskite oxides such as LaFeO3, LaCoO3 and LaAlO3 have stimulated great interest in the gas sensing technology world as promising candidates for gas sensing towards different gases. This is due to their unique electrical and electrocatalytic properties, providing good response with high selectivity and stability. Out of all the La based...
Ms
Kemi Adewale
(School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
A one-step synthesis of Ca_xZn_{1-x }Fe_2O_4 (x=0, 0.5 and 1) nanoferrites and nanocomposites by the glycol-thermal method is reported. The structural, morphological and magnetic properties were studied using XRD, HRTEM/SEM, VSM and Mössbauer spectroscopy. The XRD patterns show a single phase cubic spinel structure of ZnFe_2O_4 at x=0. A composite phase of a spinel and hematite structure of...
Mr
Ed Lopez
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
SANSA has built a low-cost (USD 100-) mesospheric ozone radiometer based on a BeagleBone micro-controller running Linux. This presentation describes the development of a real-time data viewer and algorithm that analyses the ozone spectrum to infer ozone density. A spectrum is generated roughly every 5 minutes, and one data file per day. Results examining ozone density as a function of...
Mr
David Omoefe Idisi
(Department of Physics, College of Science, Engineering and Technology, University of South Africa)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
We have synthesized Graphene-Oxide (GO) by the modified hummer’s process and functionalized with gold-nanoparticles (Au-NPs) for the study of microstructure and electrical properties. We have observed from the Raman spectroscopy that the intensity of D-peak (disorder) reduced with respect to G (graphite-cluster) when GO is functionalizes with Au-NPs (r-GO: Au). Reduction of D-peak (increase of...
Mr
Tekano Mbonani
(UFS)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
We aim to place constraints on the size and location of the radiation production regions in flaring Fermi-LAT blazars. Multi-wavelength data will be obtained from a selection of BL Lacs and FSRQ sources, from available archival data and new observations. The Fermi-LAT gamma-ray data will be analysed using the Fermi Pass 8 data reduction, which provides a significant improvement in terms of...
Prof.
Hendrik Swart
(University of the Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
BaAl2O4:Eu2+,Dy3+ is the heaviest but the least efficient persistent luminescent material in the MAl2O4:Eu2+,R3+ series. Low efficiency may be due to the hygroscopic host material and/or polymorphic crystal structure [1]. Both may deteriorate the persistent excitation and emission through a change in the trap structure thus shortening the persistent duration. Charging of BaAl2O4:Eu2+,Dy3+ is...
Mr
Brandon Bisschoff
(University of the Free state)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
Currently there is limited knowledge of the origin of the intergalactic magnetic fields (IGMF) that lie between galaxies, galaxy clusters and cosmic voids. Understanding the origin of the IGMF is a crucial component in models of galaxy and galaxy clusters formation. This magnetic field can be probed indirectly by its effect on electromagnetic cascades initiated by gamma-gamma absorption of...
Mr
Sibusiso Nqayi
(ufs)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
: Hydrogen has been labeled as the cleanest energy carrier, which can be used for fuel cells. However, the use of clean and renewable energy has been largely hindered by the low efficiency of photocatalysts. An efficient and cheap photocatalyst is required to produce energy from hydrogen in large quantities to meet the ever-increasing demand. Water splitting photocatalysts have attracted a lot...
Mr
Ayanda Zungu
(Sol Plaatje University / University of KwaZulu-Natal)
26/06/2018, 15:00
Track G - Theoretical and Computational Physics
Poster Presentation
Open quantum walks (OQWs) are a new type of quantum walks, where the “walker” is driven by dissipation [J. Stat. Phys. 147 (2012) 832]. Recently, a quantum optical scheme for the experimental realization of OQWs was proposed [Int. J. Quant. Info. 12, 1461010 (2014)]. In the proposed quantum optical scheme, a two level atom plays the role of the “walker’’ and the Fock states of the cavity mode...
Mr
Donovan Botlhole
(Botswana International University of Science and Technology)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
Abstract. Environmental radioactivity studies involving water sources are essential for the monitoring of the quality of drinking water for public consumption. Natural water sources generally contain some level of concentration of alpha and beta emitters. Radiological examination of these sources becomes necessary to determine their contribution to internal radiation exposure by ingestion....
Mr
Quinton Kaplan
(University of the Free State)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
Detailed multi-frequency studies of the white dwarf pulsar AR Scorpii (AR Sco) revealed a Spectral Energy Distribution (SED) that showed optically thin synchrotron emission between IR and X-ray energies. This implies that AR Sco is a site of particle acceleration and associated pulsar-like synchrotron emission, which makes AR Sco an interesting source to search for possible gamma-ray...
Mr
Papi Lekwene
(North West University)
26/06/2018, 15:00
Track D1 - Astrophysics
Poster Presentation
Scientific rationale
The NASA KEPLER Mission sent a 1.0 m telescope into space to search for planets around other stars. Tremendous amount of photometric data was produced and was used to study pulsating stars of the different types. Many of the observed pulsators had multiple frequencies which were used to determined detailed physics of these stars. For example, solar like oscillations...
Mrs
Abigail Huff
(University of Michigan)
26/06/2018, 15:00
Track D2 - Space Science
Poster Presentation
The observation of very low magnetic fields is of primary importance for a better understanding of Earth and environment, as well as for early warning of potential hazards coming from space. Recent scientific studies have shown that magnetometers based on Superconducting QUantum Interference Devices (SQUID’s) are able to detect P waves emitted during earthquakes or magnetic storms in the upper...
Mr
Kgashane Malatji
(iThemba LABS / Stellenbosch University)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
Most stable and extremely low abundance proton-rich nuclei with A>110 are thought to be produced by the photodisintegration of s- and r- process seed nuclei. However, this so-called p-process is insufficient to explain the observed low abundance (0.012%) of the 180Ta isotope. Hence combinations of several processes are considered to reproduce the observed abundance of 180Ta in the cosmos,...
Mr
Ndumiso Mnikathi
(student)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
The polarized ion source at iThemba LABS has been in operation for over two decades using Electron Beam (EB) ionizer. The source has been used to deliver beam for nuclear physics research. Due to its disadvantages which are producing beam with large energy spread and having complicated extraction system,the EB ionizer was replaced by Electron Cylotron Resonance (ECR) ionizer. The ECR ionizer...
Mr
Teboho Mokoena
(University of the Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Prompt technological and industrial advances uninterruptedly cause the release of hazardous and toxic gases that are harmful to human life; as a result sensing devices that are sensitive and selective to such gases are desirable. Presently, gas sensors based on semiconductor metal oxide (SMO) materials are pleasing more consideration, because of their evident change in electrical resistance...
Ms
Boitumelo Tladi
(UFS)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Graphene oxide (GO) is a derivative of graphene, consisting of an atomic layer of carbon bonded to oxygen functional groups such as hydroxyl and epoxide, which make it insulating and hydrophilic. This novel material it has attracted much research recently, although there is varying information in the literature because the properties may depend on the synthesis technique and form (powder, thin...
Mrs
Aya Alsadig
(Sudan University of Science and Technology)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Organic-inorganic halide perovskites are promising candidates for low cost, high-efficiency solar cells. We examined the structural, electronic, and optical properties of the low temperature tetragonal phase of the halide peroviskite CH3NH3PbI3 using Density Functional Theory (DFT). Our numerically predicted structure is in agreement with existing...
Ms
Esra Shrif
(University of the Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
In 2017 and 2018 data taking in the ATLAS detector at LHC, the average bunch crossing per collision is much higher than before. Thus the pile-up effect is much stronger, which will
significantly affect the MET reconstruction. In the MET reconstruction, the forward jet, which is hardly distinguished from the pile-up jet, will cause a large MET resolution. This presentation will introduce the...
Ms
Onesimo Mtintsilana
(University of Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
The background composition and shapes are studied in spectral control regions which are constructed inverting selections or lepton identification requirements. I will be looking at the effect of pileup for the H -> ZZ -> 4l channel with weighted histograms, normalized to the expected luminosity. The background considered is the qq -> ZZ reducible background which is from a dominant...
Dr
Balakrishna Avula
(University of The Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Mixed Nitrates of Zn, Eu and Yb were deposited on Si (100) substrates using the sol-gel spin coating method under optimized deposition conditions using monoethanolamine as stabilizing component. This paper reports on the morphology and topographical images of ZnO:Eu3+,Yb3+(7%) thin films. The surface composition of the annealed ZnO films were investigated by using Field emission Scanning...
Mr
Molise Jan Mphuthi
(University of the Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Efficient enhancement of solar cells has become more important due to the need for environmentally friendly renewable energy sources. Using thioglycerol as the capping agent and concentrated HCl as the catalyst, ZnS:Cu sol-gels with different Cu concentrations were successfully used to grow nanoparticle thin films on ultrasonically cleaned glass substrates. The as-deposited films were...
Ms
Tshegofatso Modungwe
(University of Free State)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Zinc Sulphide is an important optoelectronic device material with a wide band gap and it is used for violet to blue light applications. Zinc Sulphide (ZnS) nanoparticles doped with Manganese and Copper have been synthesized with the chemical co-precipitation method using Polyvinylpyrrolidone (PVP) as a capping agent to control the particle growth. The crystal structure and particle size were...
Mr
Sanele Dlamini
(UKZN)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Nickel base ferrites of the spinel structure have been reported to have interesting properties such as low coercivity, high saturation magnetization, chemical and thermal stability. These qualities allow the materials to be used in applications such as gas sensors, magnetic fluids, magnetic storage systems. The properties of NiFe2O4 can be tuned by doping in the A or B sites of the spinel...
Mr
Stefan von Buddenbrock
(University of the Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
Searches for heavy scalars beyond the Standard Model are ongoing endeavours at the LHC. One particularly interesting method of doing this is through the hypothetical decay of the heavy scalar to two Z bosons, which subsequently decay to four leptons. In this work, the ATLAS high mass four lepton search is discussed with emphasis on its experimental systematic uncertainties. The background...
Mr
Lehumo Mashishi
(Wits)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
The $H \to h h, S h, S S\to 4W\to 4\ell + 4\nu$ analysis using \ensuremath{36.1 fb^{-1}} of $pp$ collision data at a center-of-mass energy of 13~TeV recorded with the ATLAS detector at the Large Hadron Collider is presented. The analysis introduces the new Higgs-like scalar, $S$, as well as the Standerd Model Higgs boson, $h$, through the decay of the heavy scalar, $H$. The search is...
Ms
Kgomotso Modisakeng
(Sefako Makgatho Health Science University)
26/06/2018, 15:00
Track A - Physics of Condensed Matter and Materials
Poster Presentation
Cerium-doped Barium Aluminate (BaAl2O4:0.2%Ce3+) nano-powders were prepared by citrate sol-gel method to overcome the flickering luminescence in signage and displays by offsetting dark duration with persistent luminescence. The effects of annealing period (AP) at a constant temperature of 900 ⁰C and dopant concentration of 0.2% Ce3+ on the structure, particle morphology and photoluminescent...
Deepak Kar
(University of Witwatersrand)
26/06/2018, 15:00
Track B - Nuclear, Particle and Radiation Physics
Poster Presentation
The large and complex dataset from Large Hadron Collider (LHC) at CERN has led to the application of Machine Learning (ML) techniques in analysing the data. Up until now, most of the methods used to extract useful information from the large datasets have been based on physics intuition built from existing models. By applying advanced data science methodology, we have developed tools for...
