Browsing Physics by Title

Browsing Physics by Title

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  • An ultra-deep multiband very large array (VLA) survey of the faint radio sky (COSMOS-XS) : new constraints on the cosmic star formation history 
    Van der Vlugt, D.; Hodge, J.A.; Algera, H.S.B.; Smail, I.; Leslie, S.K.; Radcliffe, Jack Frederick; Riechers, D.A.; Rottgering, H. (American Astronomical Society, 2022-12-10)
    We make use of ultra-deep 3 GHz Karl G. Jansky Very Large Array (VLA) observations of the COSMOS field from the multiband COSMOS-XS survey to infer radio luminosity functions (LFs) of star-forming galaxies (SFGs). Using ...
  • An ultradeep multiband VLA survey of the faint radio sky (COSMOS-XS) : source catalog and number counts 
    Van der Vlugt, D.; Algera, H.S.B.; Hodge, J.A.; Novak, M.; Radcliffe, Jack Frederick; Riechers, D.A.; Rottgering, H.; Smolcic, V.; Walter, F. (IOP Publishing, 2021-01)
    Please read abstract in the article.
  • Uncertainty relations and entanglement in fermion systems 
    Zander, Claudia; Plastino, Angel Ricardo (Angelo) (American Physical Society, 2010-06)
    The violation of uncertainty relations is used as a signature of entanglement for both pure and mixed states of two identical fermions. In the case of fermions with a four-dimensional single-particle Hilbert space we obtain ...
  • Understanding Mind 
    Gries, Werner Hugo; University of Pretoria. Dept. of Physics (The Author, 2016-11)
  • Understanding reasoning and behaviour in terms of a modular mental structure 
    Gries, Werner Hugo; University of Pretoria. Dept. of Physics (The Author, 2014-12)
  • Unexpected properties of the inductively coupled plasma induced defect in germanium 
    Coelho, Sergio M.M.; Auret, Francois Danie; Janse van Rensburg, Pieter Johan; Nel, J.M. (Elsevier, 2014-04)
    Inductively coupled plasma (ICP) etching of germanium introduces a single defect, the E0.31 electron trap, for a large range of argon partial pressures from 4 × 10-3 to 6.5 × 10-4mbar that correspond to ion energies of 8 ...
  • The universe in perspective 
    Boeyens, Jan Christoffel Antonie (University of Toronto Press, 2010-06)
    Gödel’s rotating-universe solution of Einstein’s gravitational field equations is interpreted in real projective space. The compass of inertia is shown to coincide with the involuted geodesic of the closed manifold and ...
  • Universities in a time of change 
    Chetty, Nithaya (Academy of Science of South Africa, 2009-10)
    A casual glance at universities around the world quickly reveals that they are actually not at all as universal as the term ‘university’ might imply, as universities show enormous differences in ethos, standards, cultures, ...
  • Unravelling the glass trade bead sequence from Magoro Hill, South Africa : separating pre-seventeenth-century Asian imports from later European counterparts 
    Koleini, Farahnaz; Prinsloo, Linda Charlotta; Biemond, Wim; Colomban, Philippe; Ngo, Anh‑Tu; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M.; Van Brakel, Koos (BioMed Central, 2016-12-22)
    Excavations conducted between 2010 and 2012 at Magoro Hill, a site in South Africa’s Limpopo Province frequented or intermittently occupied by African farming communities since the first millennium AD, yielded a substantial ...
  • Unsupervised classification of simulated black hole shadows 
    Menegaldo, Micaela (University of Pretoria, 2022)
    In April 2019, the Event Horizon Telescope (EHT) Collaboration released the first image of a black hole (BH) shadow. Theoretical models that aim to describe the environments of BHs are complex and highly-dimensional numerical ...
  • Unusual coloration in scarabaeid beetles 
    Brink, D.J.; Van den Berg, N.G.; Prinsloo, Linda Charlotta; Hodgkinson, I.J. (American Institute of Physics, 2007-04-07)
    In this paper we investigate the reflection of circularly polarized light from the exocuticle of the scarabaeid beetle Gymnopleurus virens. Reflection spectra are deeply modulated, exhibiting a number of relatively narrow ...
  • Use of interfacial layers to prolong hole lifetimes in hematite probed by ultrafast transient absorption spectroscopy 
    Paradzah, Alexander Tapera; Diale, M. (Mmantsae Moche); Maabong, Kelebogile; Kruger, T.P.J. (Tjaart) (Elsevier, 2018-04)
    Hematite is a widely investigated material for applications in solar water oxidation due primarily to its small bandgap. However, full realization of the material continues to be hampered by fast electron-hole recombination ...
  • Using single molecule spectroscopy to study fast photoprotective processes in plants 
    Botha, Joshua Leon (University of Pretoria, 2016)
    The fundamental mechanisms involved in photosynthesis provide an opportunity to study physical principles that span over both classical and quantum scales. A better understanding of these mechanisms will benefit the ...
  • Utilization of waste tyres pyrolysis oil vapour in the synthesis of zeolite templated carbons (ZTCs) for hydrogen storage application 
    Musyoka, Nicholas M.; Rambau, Khavharendwe Melba Amukelani; Manyala, Ncholu I.; Ren, Jianwei; Langmi, Henrietta Wakuna; Mathe, Mkhulu K. (Taylor and Francis, 2018)
    In this study, we investigated the potential for use of waste tyre pyrolysis oil vapour as a carbon precursor in the synthesis of zeolite templated carbons (ZTC). With Zeolite 13X as the template, the ZTCs were synthesised ...
  • Van der Waals density functional studies of hydrogenated and lithiated bilayer graphene 
    Mapasha, Refilwe Edwin (University of Pretoria, 2014)
    In this thesis, we use rst principles density functional theory (DFT) to study the energetics, structural and electronic properties of hydrogenated and lithiated bilayer graphene material systems. The newly developed ...
  • Van der Waals density-functional study of 100% hydrogen coverage on bilayer graphene 
    Mapasha, Refilwe Edwin; Andrew, Richard Charles; Chetty, Nithaya (Elsevier, 2013-10)
    We investigate all hydrogen configurations that exist in a 1 1 unit cell of bilayer graphene at 100% coverage to find the low energy competing configurations using density functional theory (DFT). Other unique ...
  • Vanadium oxides based composites for supercapacitor applications 
    Ndiaye, Ndeye Maty (University of Pretoria, 2019)
    In this thesis, different vanadium-based materials and vanadium/carbon composites were synthesized and explored as active electrode materials for supercapacitor application. The major goal of this study was to incorporate ...
  • Verification of radiative transfer schemes for the EHT 
    Gold, Roman; Broderick, Avery E.; Younsi, Ziri; Fromm, Christian M.; Gammi, Charles F.; Mościbrodzka, Monika; Pu, Hung-Yi; Bronzwaer, Thomas; Davelaar, Jordy; Dexter, Jason; Ball, David; Chan, Chi-kwan; Kawashima, Tomohisa; Mizuno, Yosuke; Ripperda, Bart; Ripperda, Bart; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Balokovic, Mislav; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broguiere, Dominique; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cho, Ilje; Christian, Pierre; Conway, John E.; Cordes, James M.; Crew, Geoffrey B.; Cui, Yuzhu; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Doeleman, Sheperd S.; Eatough, Ralph P.; Falcke, Heino; Fish, Vincent L.; Fomalont, Ed; Fraga-Encinas, Raquel; Freeman, Bill; Friberg, Per; Gómez, Jose L.; Galison, Peter; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Hecht, Michael H.; Hesper, Ronald; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; Inoue, Makoto; Issaoun, Sara; James, David J.; Jannuzi, Buell T.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Keating, Garrett K.; Kettenis, Mark; Kim, Jae-Young; Kim, Junhan; Kim, Jongsoo; Kino, Motoki; Koay, Jun Yi; Koch, Patrick M.; Koyama, Shoko; Kramer, Michael; Kramer, Carsten; Krichbaum, Thomas P.; Kuo, Cheng-Yu; Lauer, Tod R.; Sang-Sung., Lee; Li, Yan-Rong; Li, Zhiyuan; Lico, Rocco; Lindqvist, Michael; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent Loinard; Lonsdale, Colin; Lu, Ru-Sen; MacDonald, Nicholas R.; Markoff, Sera; Mao, Jirong; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Mizuno, Izumi; Moran, James M.; Moriyama, Kotaro; Nagai, Hiroshi; Nakamura, Masanori; Nagar, Neil M.; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Okino, Hiroki; Ortiz-Leon, Gisela N.; Oyama, Tomoaki; Ozel, Feryal; Palumbo, Daniel C.M.; Park, Jongho; Patel, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Plambeck, Richard; Piétu, Vincent; PopStefanija, Aleksandar; Porth, Oliver; Preciado-Lopez, Jorge A.; Psaltis, Dimitrios; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruszczyk, Chet; Rygl, Kazi L.J.; Sánchez, Salvador; Sánchez-Arguelles, David; Sasada, Mahito; Savolainen, Tuomas; Schuster, Karl-Friedrich; Schloerb, F. Peter; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Tiede, Paul; Tazaki, Fumie; Tilanus, Remo P.J.; Titus, Michael; Toma, Kenji; Torne, Pablo; Trent, Tyler; Traianou, Thalia; Trippe, Sascha; Tsuda, Shuichiro; Van Langevelde, Huib Jan; Van Bemmel, Ilse; Van Rossum, Daniel R.; Wagner, Jan; Wardle, John; Wex, Norbert; Weintroub, Jonathan; Wharton, Robert; Wielgus, Maciek; Wong, George N.; Wu, Qingwen; Yoon, Doosoo; Young, Ken; Young, Andre; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. Anton; Zhao, Guangyao; Zhao, Shan-Shan; Zhu, Ziyan (American Astronomical Society, 2020-07)
    The Event Horizon Telescope (EHT) Collaboration has recently produced the first resolved images of the central supermassive black hole in the giant elliptical galaxy M87. Here we report on tests of the consistency and ...
  • Vibrational and electronic states of sapphire and wurtzite ZnO 
    Machatine, Augusto Gonçalo Jose (University of Pretoria, 2010-09-23)
    No abstract available.
  • Vibrational modes of the wurtzite structures : ZnO, GaN and 6H-SiC 
    Nephale, Ndanduleni (University of Pretoria, 2009-12-08)
    Please read the abstract in the front of the document.