Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • 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 ...
  • 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 ...
  • 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 ...
  • 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 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.
  • Low-field microwave absorption in pulse laser deposited FeSi thin film 
    Gavi, H.M. (Happyson Michael); Ngom, Balla D.; Beye, A.C.; Strydom, Andre M.; Srinivasu, V.V.; Chaker, M.; Manyala, Ncholu I. (Elsevier, 2012-03)
    Low field microwave absorption (LFMA) measurements at 9.4 GHz (X-band), were carried out on pulse laser deposited (PLD) polycrystalline B20 cubic structure FeSi thin film grown on Si (111) substrate. The LFMA properties ...
  • Magnetotactic bacteria used to generate electricity based on Faraday's law of electromagnetic induction 
    Smit, B.A.; Van Zyl, Elritha; Joubert, J.J.; Meyer, Walter Ernst; Preveral, S.; Lefevre, C.T.; Venter, Stephanus Nicolaas (Wiley, 2018-05)
    Magnetotactic bacteria (MTB) have the unique ability to produce magnetic particles surrounded by a biomembrane to form the magnetosome organelle. Therefore, MTB have novel physical and magnetic properties and have consequently ...
  • Malathion-filled trilayer polyolefin film for malaria vector control 
    Madzorera, Tatenda; Sibanda, Mthokozisi Mayibongwe; Focke, Walter Wilhelm; Madito, M.J. (Moshawe); Manyala, Ncholu I. (Elsevier, 2019-03)
    The emergence of pyrethroid resistance in mosquitoes is complicating malaria elimination efforts in Africa and alternative insecticides have to be considered for indoor residual spray. Unfortunately, the high volatility ...
  • Marginal deformations and quasi-Hopf algebras 
    Dlamini, Hector; Zoubos, Konstantinos (IOP Publishing, 2019-08)
    We establish the existence of a quasi-Hopf algebraic structure underlying the Leigh–Strassler N=1 superconformal marginal deformations of the N=4 super-Yang–Mills theory. The scalar-sector R-matrix of these theories, which ...
  • Material progress in Africa 
    Chetty, Nithaya; Martin, Richard M., 1942-; Scandolo, Sandro (Nature Publishing Group, 2010-11)
    Exciting opportunities are emerging for science and scientists in Africa. There is a vast pool of latent talent that can be a vital source of advancement and cooperation that has the potential to overcome barriers within ...
  • Measurement of L-shell X-ray production cross sections in 89Y, 158Gd and 209Bi due to 0.3 MeV/u – 1.0 MeV/u 12C ions 
    Ejeh, Ernest Ochai; Hlatshwayo, Thulani Thokozani; Madhuku, M.; Legodi, M.; Msimanga, M. (Elsevier, 2021-11)
    Please read abstract in the article.
  • Mechanical properties of graphene and boronitrene 
    Andrew, Richard Charles; Mapasha, Refilwe Edwin; Ukpong, Aniekan M.; Chetty, Nithaya (American Physical Society, 2012-03)
    Please read abstract in the article.
  • Mechanical properties of hydrogenated bilayer graphene 
    Andrew, Richard Charles; Mapasha, Refilwe Edwin; Chetty, Nithaya (AIP Publishing LLC, 2013)
    Using first principles methods, we study the mechanical properties of monolayer and bilayer graphene with 50% and 100% coverage of hydrogen. We employ the vdW-DF, vdW-DF-C09x and vdW-DF2-C09x van der Waals functionals ...
  • Mechanism of formation water molecules and chemical bonds in Leptothrix materials 
    Mirzayeva, D.M.; Aghayeva, S.A.; Kaplina, S.P.; Slavov, L.; Gustova, M.V.; Tiep, N.V.; Tuan, P.L.; Maletskii, A.V.; Doroshkevich, A.S.; Thabethe, Thabsile Theodora; Hasanov, K.M.; Kostov, L.K.; Mauyey, B. (Jomard Publishing, 2024-02)
    The provided study involves investigating chemical interactions in Leptothrix biomaterial through infrared spectroscopy. The analysis explores variations in chemical relationships based on the nature of chemical bonds ...