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Research Articles (Physics): Recent submissions

  • 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.
  • 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 ...
  • Are high elevation crag lizards sensitive to climate change? 
    Perold, Vonica; Ferguson, Jan Willem Helenus; Verburgt, Luke; Malherbe, Johan B. (Wiley, 2021-05)
    Crag lizards are restricted to montane areas where biota are strongly exposed to the effects of climate change. We investigated the factors shaping the distribution of Drakensberg crag lizards (Pseudocordylus melanotus ...
  • Jost matrices for some analytically solvable potential models 
    Ershov, S.N.; Rakityansky, Sergei Anatoljevich (American Physical Society, 2021-02)
    A family of analytically solvable potential models for the one- and two-channel problems is considered within the Jost matrix approach. The potentials are chosen to be constant in the interior region and to have ...
  • Effects of film thickness and coating techniques on the photoelectrochemical behaviour of hematite thin films 
    Kyesmen, Pannan Isa; Nombona, Nolwazi; Diale, M. (Mmantsae Moche) (MDPI, 2021-05-10)
    In this research, three different sets of hematite (α-Fe2O3) films of various thicknesses were prepared using dip, spin, and combined dip/spin coating methods. α-Fe2O3 films of 450–500, 740–800 and 920–980 ± 30 nm ...
  • Optimization of graphene oxide through various Hummers' methods and comparative reduction using green approach 
    Olorunkosebi, Allen Abiodun; Eleruja, Marcus Adebola; Adedeji, Adetayo Victor; Olofinjana, Bolutife; Fasakin, Oladepo; Omotoso, Ezekiel; Oyedotun, Kabir Oyeniran; Ajayi, Ezekiel Oladele Bolarinwa; Manyala, Ncholu I. (Elsevier, 2021-08)
    Graphene oxide (GO) was synthesized using three techniques and was reduced using two reducers' extracts from neem and pumpkin leaves. The obtained GOs and RGOs were characterized using Fourier infra-red (FTIR) spectroscopy, ...
  • Fabrication and characterization of clay-polyethylene composite opted for shielding of ionizing radiation 
    Olukotun, S.F.; Gbenu, S.T.; Oyedotun, Kabir Oyeniran; Fasakin, Oladepo; Akindoyin, G.O.; Shittu, H.O.; Fasasi, M.K.; Khandaker, Mayeen Uddin; Osman, Hamid; Elesawy, Basem H.; Sayyed, M.I. (MDPI, 2021-09-03)
    This study fabricated and characterized a self-sustaining hydrogenous content claypolyethylene composite opted for ionizing radiation shielding. Composites designated A–G were fabricated each containing 0–30 wt% of ...
  • Effect of thermal annealing on SHI irradiated indium implanted glassy carbon 
    Njoroge, Eric Gitau; Hlatshwayo, Thulani Thokozani; Mlambo, Mbuso; Odutemowo, Opeyemi Shakirah; Annan, Kofi Ahomkah; Skuratov, V.A.; Ismail, M.; Malherbe, Johan B. (Elsevier, 2021-09)
    Please read abstract in the article.
  • Novel thermally reduced graphene oxide microsupercapacitor fabricated via mask free axidraw direct writing 
    Maphiri, Vusani Muswa; Rutavi, Gift; Sylla, Ndeye Fatou; Adewinbi, Saheed A.; Fasakin, Oladepo; Manyala, Ncholu I. (MDPI, 2021-07)
    We demonstrate a simple method to fabricate all solid state, thermally reduced graphene oxide (TRGO) microsupercapacitors (µ-SCs) prepared using the atmospheric pressure chemical vapor deposition (APCVD) and a mask-free ...
  • Enhanced electrochemical behavior of peanut-shell activated carbon/molybdenum oxide/molybdenum carbide ternary composites 
    Sylla, Ndeye Fatou; Sarr, Samba; Ndiaye, Ndeye M.; Mutuma, B.K. (Bridget); Seck, Astou; Ngom, Balla D.; Chaker, Mohamed; Manyala, Ncholu I. (MDPI, 2021-04)
    Please read abstract in the article.
  • Effect of growth-time on electrochemical performance of birnessite manganese oxide (δ-MnO2) as electrodes for supercapacitors : an insight into neutral aqueous electrolytes 
    Oyedotun, Kabir Oyeniran; Mirghni, Abdulmajid Abdallah; Fasakin, Oladepo; Tarimo, Delvina Japhet; Mahmoud, Badr Ahmed Mohammed; Manyala, Ncholu I. (Elsevier, 2021-04)
    Please read abstract in the article.
  • MIGHTEE : total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields 
    Heywood, I.; Jarvis, M.J.; Hale, C.L.; Whittam, I.H.; Bester, H.L.; Hugo, B.; Kenyon, J.S.; Prescott, M.; Smirnov, Oleg M.; Tasse, C.; Afonso, J.M.; Best, P.N.; Collier, J.D.; Deane, Roger; Frank, B.S.; Hardcastle, M.J.; Knowles, K.; Maddox, N.; Murphy, E.J.; Prandoni, I.; Randriamampandry, S.M.; Santos, M.G.; Sekhar, S.; Tabatabaei, F.; Taylor, A.R.; Thorat, Kshitij (Oxford University Press, 2022-01)
    Please read abstract in the article.
  • Tuning the nanoporous structure of carbons derived from the composite of cross-linked polymers for charge storage applications 
    Barzegar, Farshad; Pavlenko, Vladimir; Zahid, Muhammad; Bello, Abdulhakeem; Xia, Xiaohua; Manyala, Ncholu I.; Ozoemena, Kenneth I.; Abbas, Qamar (American Chemical Society, 2021-01)
    Please read abstract in the article.
  • Composition-dependent structure evolution of FeVO4 nano-oxide and its visible-light photocatalytic activity for degradation of methylene blue 
    Thaba, Kgabo P.; Mphahlele-Makgwane, Mabel M.; Kyesmen, Pannan Isa; Diale, M. (Mmantsae Moche); Baker, Priscilla G.L.; Makgwane, Peter R. (Elsevier, 2022-01)
    Please read abstract in the article.
  • Gravitational test beyond the first post-newtonian order with the shadow of the M87 black hole 
    Psaltis, Dimitrios; Medeiros, Lia; Christian, Pierre; Ozel, Feryal; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Ball, David; Balokovic, Mislav; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, Wilfred; Bower, Geoffrey C.; 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, Yongjun; Cho, Ilje; Conway, John E.; Cordes, James M.; Crew, Geoffrey B.; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Eatough, Ralph P.; Falcke, Heino; Fish, Vincent L.; Fomalont, Ed; Fraga-Encinas, Raquel; Friberg, Per; Fromm, Christian M.; Gammie, Charles F.; García, Roberto; Gentaz, Olivier; Goddi, Ciriaco; Gomez, Jose L.; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; 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; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Kawashima, Tomohisa; 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.; Lee, Sang-Sung; Li, Yan-Rong; Li, Zhiyuan; Lindqvist, Michael; Lico, Rocco; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Lonsdale, Colin; Lu, Ru-Sen; Mao, Jirong; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Mizuno, Yosuke; Mizuno, Izumi; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Muller, Cornelia; Musoke, Gibwa; Mus Mejias, Alejandro; Nagai, Hiroshi; Nagar, Neil M.; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Neri, Roberto; Noutsos, Aristeidis; Okino, Hiroki; Olivares, Hector; Oyama, Tomoaki; Palumbo, Daniel C.M.; Park, Jongho; Patel, Nimesh; Pen, Ue-Li; Pietu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Prather, Ben; Preciado-Lopez, Jorge A.; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Ripperda, Bart; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruszczyk, Chet; Ryan, Benjamin R.; Rygl, Kazi L.J.; Sanchez, Salvador; Sanchez-Arguelles, David; Sasada, Mahito; Savolainen, Tuomas; Schloerb, F. Peter; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Tazaki, Fumie; Tilanus, Remo P.J.; Titus, Michael; Torne, Pablo; Trent, Tyler; Traianou, Efthalia; Trippe, Sascha; Van Bemmel, Ilse; Van Langevelde, Huib Jan; Van Rossum, Daniel R.; Wagner, Jan; Wardle, John; Ward-Thompson, Derek; Weintroub, Jonathan; Wex, Norbert; Wharton, Robert; Wielgus, Maciek; Wong, George N.; Wu, Qingwen; Yoon, Doosoo; Young, Andre; Younsi, Ziri; Yuan, Feng; Yuan, Ye-Fei; Zhao, Shan-Shan (American Physical Society, 2020-10-01)
    The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new and clean gravitational test of the ...
  • 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 ...
  • Isothermal annealing of selenium (Se)-implanted silicon carbide : structural evolution and migration behavior of implanted Se 
    Abdalla, Zaki Adam Yousif; Njoroge, Eric Gitau; Mlambo, Mbuso; Motloung, Setumo Victor; Malherbe, Johan B.; Hlatshwayo, Thulani Thokozani (Elsevier, 2022-01)
    Please read abstract in the article.
  • Sequential physical vapor deposited methylammonium lead tri-iodide perovskites on FTO and ITO modified zinc oxide nanorods for perovskite solar cells 
    Mayimele, Meeheketo Advice; Fru, Juvet Nche; Nyarige, Justine Sageka; Diale, M. (Mmantsae Moche) (Elsevier, 2022-01)
    Please read abstract in the article.
  • MIGHTEE-HI : discovery of an H I-rich galaxy group at z = 0.044 with MeerKAT 
    Ranchod, Shilpa; Deane, Roger; Ponomareva, Anastasia A.; Blecher, Tariq; Frank, Bradley S.; Jarvis, Matt J.; Maddox, Natasha; Mulaudzi, Wanga; Glowacki, Marcin; Hess, Kelley M.; Tudorache, Madalina; Verdes-Montenegro, Lourdes; Adams, Nathan J.; Bowler, Rebecca A.A.; Collier, Jordan D.; Taylor, Russ (Oxford University Press, 2021-07)
    We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in H I in this z ∼ 0.044 group, with a 3σ column density sensitivity of NH I ...
  • Stability, electronic and defect levels induced by substitution of Al and P pair in 4H–SiC 
    Igumbor, E.; Dongho-Nguimdo, G.M.; Mapasha, Refilwe Edwin; Omotoso, E.; Meyer, Walter Ernst (Elsevier, 2020-07)
    Please read the abstract in the article.