Browsing Physics by Title

Browsing Physics by Title

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  • K-edge x-ray dichroism investigation of Fe1-xCoxSi : experimental evidence for spin polarization crossover 
    Hearne, G.R.; Diguet, G.; Baudelet, F.; Itié, J-P.; Manyala, Ncholu I. (Elsevier, 2015-04)
    Both Fe and Co K-edge x-ray magnetic circular dichroism (XMCD) have been employed as element-specific probes of the magnetic moments in the composition series of the disordered ferromagnet Fe1-xCoxSi (for x = 0.2, 0.3, ...
  • Kalibrering van 'n opto-elektroniese stelsel vir die karakterisering van ultraviolet-sensitiewe fotodiodes 
    Van Schalkwyk, Louwrens; Meyer, Walter Ernst; Nel, Jacqueline Margot; Auret, Francois Danie (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2011)
    Spectral and electrical characteristion of ultraviolet (UV) sensitive photodiodes requires a calibrated optoelectronic system. For spectral characteristion, the irradiance of the UV light source, after the light passed ...
  • Kinetics of growth of thin-films of Co2Si, Ni2Si, WSi2 and VSi2 during a reactive diffusion process 
    Akintunde, S.O. (Samuel); Selyshchev, Pavel (Elsevier, 2016)
    A theoretical approach is developed which describes the growth kinetics of thin films of near noble metal silicide (especially of cobalt silicide (Co2Si) and nickel silicide (Ni2Si)) and refractory metal silicide (particularly ...
  • Kinetics of solid-state reactions between zirconium thin film and silicon carbide at elevated temperatures 
    Njoroge, Eric Gitau; Theron, C.C. (Chris); Malherbe, Johan B.; Ndwandwe, O.M. (Elsevier, 2014-08)
    Solid state reactions between a thin film (133 nm) of Zr and bulk single crystalline 6H-SiC substrates have been studied at temperatures between 600 °C and 850 °C for durations of 30, 60 and 120 min under high vacuum ...
  • Landauer’s principle and divergenceless dynamical systems 
    Zander, Claudia; Plastino, Angel Ricardo (Angelo); Casas, Montserrat; Curilef, Sergio (MDPI, 2009-10-13)
    Landauer’s principle is one of the pillars of the physics of information. It constitutes one of the foundations behind the idea that “information is physical”. Landauer’s principle establishes the smallest amount of energy ...
  • Laplace current deep level transient spectroscopy measurements of defect states in methylammonium lead bromide single crystals 
    Rosenberg, John W.; Legodi, M.J. (Matshisa Johannes); Rakita, Yevgeny; Cahen, David; Diale, M. (Mmantsae Moche) (American Institute of Physics, 2017)
    We present a measurement of the energies and capture cross-sections of defect states in methylammonium lead bromide (MAPbBr3) single crystals. Using Laplace current deep level transient spectroscopy (I-DLTS), two prominent ...
  • The large-scale radio continuum environment of the prototypical binary active galactic nucleus system, NGC 6240 
    Magolego, Isaac Selaelo (University of Pretoria, 2022)
    Diffuse radio sources are best studied at low radio frequencies (<~ 1 GHz) as they typically have steep radio spectra, resulting in higher flux densities at lower frequencies. However, this requires high surface brightness ...
  • Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate 
    Onwudiwe, Damian C.; Kruger, T.P.J. (Tjaart); Strydom, C.A. (Christiena Adriana) (Elsevier, 2014-02)
    Nanoparticles of CdS and ZnS were produced by a nanosecond laser using zinc (II) and cadmium (II) complexes of ethyl xanthate. Laser pulses with a peak wavelength of 355 nm, pulse repetition rate of 10 Hz, and pulse ...
  • Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone 
    Onwudiwe, Damian C.; Kruger, T.P.J. (Tjaart); Jordaan, Anine; Strydom, C.A. (Christiena Adriana) (Elsevier, 2014-12)
    Zinc sulphide (ZnS) nanoparticles have been synthesised by a green approach involving laser irradiationof an aqueous solution of zinc acetate (Znac2) and sodium sulphide (Na2S·9H2O) or thioacetamide (TAA)in polyvinylpyrrolidone ...
  • Li states on a C–H vacancy in graphane : a first-principles study 
    Mapasha, Refilwe Edwin; Molepo, M.P.; Chetty, Nithaya (Royal Society of Chemistry, 2017)
    Using a hybrid density functional theory approach, we have studied the effect of the interaction of a Li atom with a C–H pair vacancy defect (VCH) in a graphane monolayer on the thermodynamic stability, structural, magnetic ...
  • Limits on Pluto’s ring system from the June 12 2006 stellar occultation and implications for the New Horizons impact hazard 
    Throop, Henry B.; French, Richard G.; Shoemaker, Kevin; Olkin, Cathy B.; Ruhland, Trina R.; Young, Leslie A. (Elsevier, 2015-01)
    The Pluto system passed in front of a 15th magnitude star on 12 June 2006. We observed this occultation from the 3.9 m Anglo-Australian Telescope (AAT), and took photometric observations every 100 ms for 3 h. Our three-hour ...
  • Lithium and electrical properties of ZnO 
    Vines, L.; Monakhov, E.V.; Schifano, R.; Mtangi, Wilbert; Auret, Francois Danie; Svensson, B.G. (American Institute of Physics, 2010-03)
    Hydrothermally grown n-type ZnO samples have been investigated by deep level transient spectroscopy (DLTS), thermal admittance spectroscopy (TAS), temperature dependent Hall effect (TDH) temperature, and secondary ion ...
  • Local divergence and curvature divergence in first order optics 
    Mafusire, Cosmas; Kruger, T.P.J. (Tjaart) (IOP Publishing, 2018-06)
    The far-field divergence of a light beam propagating through a first order optical system is presented as a square root of the sum of the squares of the local divergence and the curvature divergence. The local divergence ...
  • Local spectroscopic properties of certain plasmonic and plexcitonic systems 
    Ugwuoke, Luke C. (University of Pretoria, 2020-12-06)
    In the framework of the quasi-static approximation (QSA), some theoretical studies were conducted within the local response approximation (LRA). In these studies, certain plasmonic and plexcitonic systems were proposed, ...
  • Localized surface plasmon resonances of simple tunable plasmonic nanostructures 
    Ugwuoke, Luke C.; Mančal, Tomáš; Kruger, T.P.J. (Tjaart) (Springer, 2020-02)
    We derive and present systematic relationships between the analytical formulas for calculation of the localized surface plasmon resonances (LSPR) of some plasmonic nanostructures which we have categorized as simple. These ...
  • Locating Resonances in a Complex Potential Field 
    Fakira-Du Toit, Hamida Hamida Sarah Jane (University of Pretoria, 2016)
    The main question that has been answered in this research project is: what happens to the singularities of the S-matrix when the interaction potential becomes complex? In other words, we looked at the resonance spectral ...
  • Long range annealing of defects in germanium by low energy plasma ions 
    Archilla, J.F.R.; Coelho, Sergio M.M.; Auret, Francois Danie; Dubinko, V.I.; Hizhnyakov, V. (Elsevier, 2015-03)
    Ions arriving at a semiconductor surface with very low energy (2–8 eV) are interacting with defects deep inside the semiconductor. Several different defects were removed or modified in Sb-doped germanium, of which the ...
  • Looking at the distant universe with the MeerKAT array : discovery of a luminous OH megamaser at z>0.5 
    Glowacki, Marcin; Collier, Jordan D.; Kazemi-Moridani, Amir; Frank, Bradley; Roberts, Hayley; Darling, Jeremy; Klockner, Hans-Rainer; Adams, Nathan; Baker, Andrew J.; Bershady, Matthew; Blecher, Tariq; Blyth, Sarah-Louise; Bowler, Rebecca; Catinella, Barbara; Chemin, Laurent; Crawford, Steven M.; Cress, Catherine; Dave, Romeel; Dave, Romeel; Deane, Roger; De Blok, Erwin; Delhaize, Jacinta; Duncan, Kenneth; Elson, Ed; February, Sean; Gawiser, Eric; Hatfield, Peter; Healy, Julia; Henning, Patricia; Hess, Kelley M.; Heywood, Ian; Holwerda, Benne W.; Hoosain, Munira; Hughes, John P.; Hutchens, Zackary L.; Jarvis, Matt; Kannappan, Sheila; Katz, Neal; Keres, Dusan; Korsaga, Marie; Kraan-Korteweg, Renee C.; Lah, Philip; Lochner, Michelle; Maddox, Natasha; Makhathini, Sphesihle; Meurer, Gerhardt R.; Meyer, Martin; Obreschkow, Danail; Oh, Se-Heon; Oosterloo, Tom; Oppor, Joshua; Pan, Hengxing; Pisano, D.J.; Randriamiarinarivo, Nandrianina; Ravindranath, Swara; Schroder, Anja C.; Skelton, Rosalind; Smirnov, Oleg; Smith, Mathew; Somerville, Rachel S.; Srianand, Raghunathan; Staveley-Smith, Lister; Tanaka, Masayuki; Vaccari, Mattia; Van Driel, Wim; Verheijen, Marc; Walter, Fabian; Wu, John F.; Zwaan, Martin A. (IOP Publishing, 2022-05)
    In the local universe, OH megamasers (OHMs) are detected almost exclusively in infrared-luminous galaxies, with a prevalence that increases with IR luminosity, suggesting that they trace gas-rich galaxy mergers. Given the ...
  • Low temperature thermal properties of HTR nuclear fuel composite graphite 
    Murovhi, Phathutshedzo (University of Pretoria, 2013)
    Graphite and graphite composite materials are of great importance in various applications; however, they have been widely used in nuclear applications. Primarily in nuclear applications such, as a moderator where its primary ...
  • Low temperature thermally reduced graphene oxide directly on Ni-Foam using atmospheric pressure-chemical vapour deposition for high performance supercapacitor application 
    Maphiri, Vusani M.; Bakhoum, Daba T.; Sarr, Samba; Sylla, Ndeye Fatou; Rutavi, Gift; Manyala, Ncholu I. (Elsevier, 2022-08)
    Please read abstract in the article.