Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • 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 ...
  • 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 ...