Browsing Research Articles (Physics) by Title

Browsing Research Articles (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 ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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 ...
  • Viewing classical radio galaxies with the upgraded GMRT and MeerKAT 
    Lal, Dharam V.; Legodi, Portia; Fanaroff, Bernie; Venturi, Tiziana; Smirnov, Oleg M.; Bondi, Marco; Thorat, Kshitij; Bester, Landman H.; Jozsa, Gyula I.G.; Kleiner, Dane; Loi, Francesca; Makhathini, Sphesihle; White, Sarah V. (MDPI, 2021-10-29)
    We present a progress report of a study of FR I and FR II radio galaxies. Several new morphological features in the radio emission are now revealed using the high (mJy) sensitivity reached in the range 550–1712 MHz, more ...
  • Visualising higher order Brillouin zones with applications 
    Andrew, Richard Charles; Salagaram, Trisha; Chetty, Nithaya (Institute of Physics, 2017-02-28)
    A key concept in material science is the relationship between the Bravais lattice, the reciprocal lattice and the resulting Brillouin zones (BZ). These zones are often complicated shapes that are hard to construct and ...
  • A VO2 based hybrid super-capacitor utilizing a highly concentrated aqueous electrolyte for increased potential window and capacity 
    Lindberg, Simon; Ndiaye, Ndeye Maty; Manyala, Ncholu I.; Johansson, Patrik; Matic, Aleksandar (Elsevier, 2020-06)
    In this work we demonstrate the application of a highly concentrated aqueous electrolyte to a hybrid supercapacitor cell. We combine an 8 m Sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) aqueous electrolyte with a ...
  • A wafer-scale Bernal-stacked bilayer graphene film obtained on a dilute Cu (0.61 at% Ni) foil using atmospheric pressure chemical vapour deposition 
    Madito, M.J. (Moshawe); Manyala, Ncholu I.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Masikhwa, T.M. (Tshifhiwa); Momodu, Damilola Y. (Royal Society of Chemistry, 2016)
    A bilayer graphene film was synthesized on a dilute Cu (0.61 at% Ni) foil using atmospheric pressure chemical vapour deposition (AP-CVD). Atomic force microscopy average step height analysis, scanning electron microscopy ...
  • Wasserstein distance between noncommutative dynamical systems 
    Duvenhage, Rocco (Elsevier, 2023-11)
    We introduce and study a class of quadratic Wasserstein distances on spaces consisting of generalized dynamical systems on a von Neumann algebra. We emphasize how symmetry of such a Wasserstein distance arises, but also ...
  • Waste chicken bone-derived porous carbon materials as high performance electrode for supercapacitor applications 
    Tarimo, Delvina Japhet; Oyedotun, Kabir Oyeniran; Sylla, Ndeye Fatou; Mirghni, Abdulmajid Abdallah; Ndiaye, Ndeye Maty; Manyala, Ncholu I. (Elsevier, 2022-07)
    Please read abstract in the article.
  • Wave packet dynamics for a non-linear Schrödinger equation describing continuous position measurements 
    Zander, Claudia; Plastino, Angel Ricardo (Angelo); Diaz-Alonso, J. (Elsevier, 2015-11)
    We investigate time-dependent solutions for a non-linear Schrödinger equation recently proposed by Nassar and Miret-Artés (NM) to describe the continuous measurement of the position of a quantum particle (Nassar, 2013; ...
  • What to feed or what not to feed‑that is still the question 
    Lech, James C.; Dorfsman, Sophia I.; Repas, Zoltan; Kruger, T.P.J. (Tjaart); Gyalai, Ingrid Melinda; Boros, Laszlo G. (Springer, 2021-11-20)
    INTRODUCTION : This review addresses metabolic diversities after grain feeding of cattle using artificial total mixed ration (TMR), in place of pasture-based feeding. OBJECTIVES : To determine how grain feeding impairs the ...