Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • Photon-induced tunable and reversible wettability of pulsed laser deposited W-doped ZnO nanorods 
    Ngom, B.D.; Sakho, O.; Ndiaye, S.; Bartali, R.; Diallo, A.; Gaye, M.B.; Bady, S.; Manyala, Ncholu I.; Maaza, M.; Beye, A.C. (EDP Sciences, 2011-08-11)
    ZnO nanorods arrays were prepared on soda lime glass substrate by pulsed laser deposition method. Hexagonal rod-like ZnO rods were obtained under different conditions.Well-defined ZnO nanorods arrays were selected among ...
  • Phycocyanin: one complex, two states, two functions 
    Gwizdala, Michal; Kruger, T.P.J. (Tjaart); Wahadoszamen, Md.; Gruber, J. Michael; Van Grondelle, Rienk (American Chemical Society, 2018-03)
    Solar energy captured by pigments embedded in light-harvesting complexes can be transferred to neighboring pigments, dissipated, or emitted as fluorescence. Only when it reaches a reaction center is the excitation energy ...
  • Physicochemical and morphological properties of a small granule legume starch with atypical properties from wild mango (Cordyla africana L.) seeds : a comparison to maize, pea, and kidney bean starch 
    Ngobese, Nomali Ziphorah; Wokadala, Obiro Cuthbert; Du Plessis, Belinda; Da Silva, Laura Suzanne; Hall, Alan; Lepule, Sello Presly; Penter, Mark; Ngcobo, Mduduzi Elijah Khulekani; Swart, Hendrik C. (Wiley, 2018-11)
    The physicochemical properties of wild mango (Cordyla africana L) seed starch are assessed and compared to bean, pea, and commercial maize starch. Scanning electron microscopy (SEM) and polarized optical microscopy (POM) ...
  • Plasmonic quantum yield enhancement of a single molecule near a nanoegg 
    Ugwuoke, Luke C.; Mancal, Tomas; Kruger, T.P.J. (Tjaart) (American Institute of Physics, 2020-05)
    We investigate the impact of the dipole-active modes formed via the mode-mixing of the dipole mode with higher-order surface plasmon modes of a nanoegg on the radiative decay rate and quantum yield of an excited molecule ...
  • Polarimetric properties of Event Horizon Telescope targets from ALMA 
    Goddi, Ciriaco; Marti-Vidal, Ivan; Messias, Hugo; Bower, Geoffrey C.; Broderick, Avery E.; Dexter, Jason; Marrone, Daniel P.; Moscibrodzka, Monika; Nagai, Hiroshi; Algaba, Juan Carlos; Asada, Keiichi; Crew, Geoffrey B.; Gomez, José L.; Impellizzeri, C. M. Violette; Janssen, Michael; Kadler, Matthias; Krichbaum, Thomas P.; Lico, Rocco; Matthews, Lynn D.; Nathanail, Antonios; Ricarte, Angelo; Ros, Eduardo; Younsi, Ziri; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen (陈永军), Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger (IOP Publishing, 2021-03)
    Please read abstract in the article.
  • Polyaniline nanoparticles for the selective recognition of aldrin : synthesis, characterization, and adsorption 
    Munyati, M.O.; Mbozi, A.; Siamwiza, M.N.; Diale, M. (Mmantsae Moche) (Elsevier, 2017-11)
    We report the preparation, characterization, and property evaluation of molecularly imprinted polyaniline nanoparticles that can be used for the selective recognition of aldrin. The molecularly imprinted polyaniline ...
  • Polygamous farmed Nile crocodiles (Crocodylus niloticus) : foetal membranes tell the story 
    Nothling, Johan Oliviette; Nothling, Johan Antowan; Myburgh, Jan G.; Harper, Cindy Kim (AOSIS Open Journals, 2020-11-06)
    Multiple paternity in crocodilian broods would increase effective population size and slow down the loss of genetic variation due to inbreeding and random genetic drift in real populations. Multiple paternity may also ...
  • Polypyrrole-promoted rGO-MoS2 nanocomposites for enhanced photocatalytic conversion of CO2 and H2O to CO, CH4, and H-2 products 
    Kumar, Neeraj; Kumar, Santosh; Gusain, Rashi; Manyala, Ncholu I.; Eslava, Salvador; Ray, Suprakas Sinha (American Chemical Society, 2020-09)
    Please read abstract in the article.
  • Potential for identifying plant-based toxins on San hunter-gatherer arrowheads 
    Wooding, Madelien; Bradfield, Justin; Maharaj, Vinesh J.; Koot, Dwayne; Wadley, Lyn; Prinsloo, Linda Charlotta; Lombard, Marlize (Academy of Science of South Africa, 2017-03)
    The antiquity of the use of hunting poisons has received much attention in recent years. In this paper we present the results of a pilot study designed to detect the presence of organic compounds, typically of less ...
  • The practical teaching of quantum mechanics 
    Chetty, Nithaya (IOP Publishing Limited, 2020)
    The author teaches introductory quantum mechanics to third-year students at the University of Pretoria. Quantum mechanics is without a doubt one of the most challenging topics in the physics curriculum. It has been described ...
  • Preparation and characterization of Poly(vinyl alcohol)/graphene nanofibers synthesized by electrospinning 
    Barzegar, Farshad; Bello, Abdulhakeem; Fabiane, Mopeli; Khamlich, Saleh; Momodu, Damilola Y.; Taghizadeh, Fatemeh; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2015-02)
    We report on the synthesis and characterization of electrospun polyvinyl alcohol (PVA)/graphene nanofibers. The samples produced were characterized by Raman spectroscopy for structural and defect density analysis, scanning ...
  • Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte 
    Barzegar, Farshad; Bello, Abdulhakeem; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2016-03)
    In this work, we present the synthesis of low cost carbon nanosheets derived from expanded graphite dispersed in Polyvinylpyrrolidone, subsequently activated in KOH and finally carbonized in Ar atmosphere. Interconnected ...
  • Preparation and physico-chemical investigation of anatase TiO2 nanotubes for a stable anode of lithium-ion battery 
    Fasakin, Oladepo; Oyedotun, Kabir Oyeniran; Kebede, Mesfin; Rohwer, Mark; Le Roux, Lukas; Mathe, Mkhulu; Eleruja, M.A.; Ajayi, Ezekiel Oladele Bolarinwa; Manyala, Ncholu I. (Elsevier, 2020-12)
    Please read abstract in the article.
  • Preparation of carbon nanofibers/tubes using waste tyres pyrolysis oil and coal fly ash derived catalyst 
    Rambau, Khavharendwe Melba Amukelani; Musyoka, Nicholas M.; Manyala, Ncholu I.; Ren, Jianwei; Langmi, Henrietta Wakuna; Mathe, Mkhulu K. (Taylor and Francis, 2018)
    In this study, two waste materials namely; coal fly ash (CFA) and waste tyres pyrolysis oil, were successfuly utilized in the synthesis of carbon nanofibers/tubes (CNF/Ts). In addition, Fe-rich CFA magnetic fraction (Mag-CFA) ...
  • 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 ...