Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • Pressure-induced quantum phase transition in Fe1−xCoxSi (x = 0.1, 0.2) 
    Forthaus, M.K.; Hearne, G.R.; Manyala, Ncholu I.; Heyer, O.; Brand, R.A.; Khomskii, D.I.; Lorenz, T.; Abd-Elmeguid, M.M. (American Physical Society, 2011-02)
    Please read abstract in the article.
  • Primary beam effects of radio astronomy antennas - II. modelling MeerKAT L-band beams 
    Asad, K.M.B.; Girard, J.N.; De Villiers, M.M.; Ansah-Narh, T.; Iheanetu, K.; Smirnov, Oleg M.; Santos, M.G.; Lehmensiek, R.; Jonas, J.; De Villiers, D.I.L.; Thorat, Kshitij; Hugo, Benjamin V.; Makhathini, Sphesihle; Jozsa, Gyula I.G.; Sirothia, S.K. (Oxford University Press, 2021-02)
    After a decade of design and construction, South Africa’s SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate ...
  • A probabilistic approach to phase calibration – I. Effects of source structure on fringe-fitting 
    Natarajan, I.; Deane, Roger; Van Bemmel, I.; Van Langevelde, H.J.; Small, D.; Kettenis, M.; Paragi, Z.; Smirnov, Oleg M.; Szomoru, A. (Oxford University Press, 2020-07)
    We propose a probabilistic framework for performing simultaneous estimation of source structure and fringe-fitting parameters in very long baseline interferometry (VLBI) observations. As a first step, we demonstrate this ...
  • Probing the extensive nature of entropy 
    Salagaram, Trisha; Chetty, Nithaya (IOP Publishing Limited, 2013-11-21)
    We have devised a general numerical scheme applied to a system of independent, distinguishable, non-interacting particles, to demonstrate in a direct manner the extensive nature of statistical entropy. Working within the ...
  • Progress thus far : women in physics in South Africa 
    Diale, M. (Mmantsae Moche); Gledhill, Igle; Ledwaba, Sylvia (American Institute of Physics, 2019-06-03)
    Physics still has a long way to go in addressing acceleration of women to higher ranks of research and leadership. The general trend shows that the personal choices affect the acceleration of women to the top in both ...
  • Properties of ITO thin films rapid thermally annealed in different exposures of nitrogen gas 
    Ollotu, E.R.; Nyarige, Justine Sageka; Mlyuka, N.R.; Samiji, M.E.; Diale, M. (Mmantsae Moche) (Springer, 2020-10)
    Indium tin oxide (ITO) thin films were rapid thermal annealed (RTA) for 5 min at a temperature of 550 °C in different exposures of nitrogen gas. Effects of these exposures on the structural, morphological, electrical, and ...
  • Pulsed laser deposited Cr2O3 nanostructured thin film on graphene as anode material for lithium-ion batteries 
    Khamlich, S.; Nuru, Z.Y.; Bello, Abdulhakeem; Fabiane, Mopeli; Dangbegnon, Julien K.; Manyala, Ncholu I.; Maaza, M. (Elsevier, 2015-07)
    Pulsed laser deposition technique was used to deposit Cr2O3 nanostructured thin film on a chemical vapour deposited few-layer graphene (FLG) on nickel (Ni) substrate for application as anode material for lithium-ion ...
  • Q&A with a nuclear physicist 
    Thabethe, Thabsile Theodora (Academy of Science South Africa, 2019)
    This interview was one of the #WomenofUP profiles posted on the university’s website during August to celebrate Women’s Month. You’re a Wow! What made you choose this career path? During my first year at the University ...
  • Q-entropies and the entanglement dynamics of two-qubits interacting with an environment 
    Hamadou-Ibrahim, A.; Plastino, Angel Ricardo (Angelo) (Sociedade Brasileira de Fisica, 2008-12)
    We investigate entropic aspects of the quantum entanglement dynamics of two-qubits systems interacting with an environment. In particular we consider the detection, based on the violation of classical entropic inequalities ...
  • Quadratic Wasserstein metrics for von Neumann algebras via transport plans 
    Duvenhage, Rocco de Villiers (Theta Foundation, 2022)
    Please read abstract in the article.
  • Quantum entanglement in a many-body system exhibiting multiple quantum phase transitions 
    Zander, Claudia; Plastino, Angel Ricardo (Angelo) (Sociedade Brasileira de Fisica, 2009-08)
    We investigate the quantum entanglement-related features of the many-body model of Plastino and Moszkowski [N. Cimento 47 (1978) 470]. This is an exactly solvable N-body, SU2 two-level model exhibiting several quantum ...
  • Quantum entanglement, spin-1/2 and the Stern–Gerlach experiment 
    Roston, G.B.; Casas, Montserrat; Plastino, Angel Ricardo (Angelo) (American Institute of Physics, 2006-06)
    Basic aspects of quantum entanglement are illustrated in connection with the two-component wavefunction description of spin-1/2 particles. In particular, the time evolution of entanglement in the Stern–Gerlach experiment ...
  • Quantum Monte Carlo study of pressure-induced B3-B1 phase transition in GaAs 
    Ouma, C.N.M.; Mapelu, M.Z.; Makau, N.W.; Amolo, G.O.; Maezono, Ryo (American Physical Society, 2012-09-28)
    We have investigated the transition pressure pt of bulk GaAs from the zinc-blende (B3) to the rocksalt (B1) structure using the local-density approximation (LDA), Perdew-Burke-Ernzerhof generalized gradient approximation ...
  • Quantum Wasserstein distance of order 1 between channels 
    Duvenhage, Rocco de Villiers; Mapaya, Mathumo (World Scientific Publishing, 2023-06)
    We set up a general theory leading to a quantum Wasserstein distance of order 1 between channels in an operator algebraic framework. This gives a metric on the set of channels from one composite system to another, which ...
  • Radiation damage in ZnO ion implanted at 15 K 
    Wendler, E.; Bilani, O.; Gartner, K.; Wesch, W.; Hayes, M.; Auret, Francois Danie; Lorenz, K.; Alves, E. (Elsevier, 2009)
    Commercial O-face (0 0 0 1) ZnO single crystals were implanted with 200 keV Ar ions. The ion fluences applied cover a wide range from 5 x 1011 to 7 x 1016 cm-2. The implantation and the subsequent damage analysis by ...
  • The radio emission from active galactic nuclei 
    Radcliffe, Jack Frederick; Barthe, P.D.; Garrett, M.A.; Beswick, R.J.; Thomson, A.P.; Muxlow, T.W.B. (EDP Sciences, 2021-05)
    CONTEXT: For nearly seven decades, astronomers have been studying active galaxies, that is to say, galaxies with actively accreting central supermassive black holes: active galactic nuclei (AGN). A small fraction are ...
  • Radio imaging of gravitationally lensed radio-quiet quasars 
    Jackson, Neal; Badole, Shruti; Dugdale, Thomas; Stacey, Hannah R.; Hartley, Philippa; McKean, J.P. (Oxford University Press, 2024-03)
    Please read abstract in the article.
  • Raman analysis of bilayer graphene film prepared on commercial Cu(0.5 at% Ni) foil 
    Madito, M.J. (Moshawe); Bello, Abdulhakeem; Dangbegnon, Julien K.; Oliphant, C.J.; Jordaan, W.A.; Masikhwa, T.M. (Tshifhiwa); Momodu, Damilola Y.; Manyala, Ncholu I. (Wiley, 2016-05)
    This study reports the Raman analysis of bilayer graphene films prepared on commercial dilute Cu(0.5 at% Ni) foils using atmospheric pressure chemical vapor deposition. A bilayer graphene film obtained on Cu foil is known ...
  • Raman classification of the glass beads excavated on Mapungubwe Hill and K2, two archaeological sites in South Africa 
    Tournié, Aurélie; Prinsloo, Linda Charlotta; Colomban, Philippe (Wiley, 2012-04)
    About 200 coloured glass beads (red, yellow, green, blue, white, black, pink, plum) excavated on Mapungubwe hill and at K2, archaeological sites in the Limpopo valley South Africa, were studied with Raman scattering. This ...
  • Raman signatures of the modern pigment (Zn, Cd)S 1- xSe x and glass matrix of a red bead from Magoro Hill, an archaeological site in Limpopo Province, South Africa, recalibrate the settlement chronology 
    Prinsloo, Linda Charlotta; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M.; Webb, Geoffrey (Elsevier, 2012)
    Two glass trade beads, one red and one yellow, retrieved from a secure archaeological context on Magoro Hill, an erstwhile Venda stronghold in South Africa’s Limpopo Province, were analyzed with Raman and photoluminescence ...