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Research Articles (Physics): Recent submissions

  • Determination of capture barrier energy of the e-center in palladium Schottky barrier diodes of antimony-doped germanium by varying the pulse width 
    Omotoso, Ezekiel; Paradzah, Alexander Tapera; Igumbor, E.; Taleatu, B.A.; Meyer, Walter Ernst; Auret, Francois Danie (IOP Publishing, 2020-02-04)
    Please read abstract in the article.
  • X-ray diffraction and thermodynamics kinetics of SiB6 under gamma irradiation dose 
    Mirzayev, M.N.; Jabarov, S.H.; Asgerov, E.B.; Mehdiyeva, R.N.; Thabethe, Thabsile Theodora; Biira, S.; Tiep, N.V. (Springer, 2019-10)
    Please read abstract in the article.
  • 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 ...
  • THEMIS : a parameter estimation framework for the Event Horizon Telescope 
    Broderick, Avery E.; Gold, Roman; Karami, Mansour; Preciado-Lopez, Jorge A.; Tiede, Paul; Pu, Hung-Yi; Akiyama, Kazunori; 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; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; 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; Doeleman, Sheperd S.; Eatough, Ralph P.; Falcke, Heino; Fish, Vincent L.; Fomalont, Ed; Fraga-Encinas, Raquel; Friberg, Per; Fromm, Christian M.; Galison, Peter; Gammie, Charles F.; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gómez, Jose L.; 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.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jung, Taehyun; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, Jae-Young; Kim, Jongsoo; Kino, Motoki; Koay, Jun Yi; Koch, Patrick M.; Koyama, Shoko; Kramer, Michael; Krame, Carsten; Krichbaum, Thomas P.; Kuo, Cheng-Yu; Lee, Sang-Sung; Li, Yan-Rong; Li, Zhiyuan; Lindqvist, Michael; Lico, Rocco; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin; Lu, Ru-Sen; MacDonald, Nicholas R.; Mao, Jirong; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Menten, Karl M.; Mizuno, Yosuke; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Muller, Cornelia; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Okino, Hiroki; Olivares, Hector; Ortiz-Leon, Gisela N.; Oyama, Tomoaki; Palumbo, Daniel C.M.; Park, Jongho; Pen, Ue-Li; Pesce, Dominic W.; Pietu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Porth, Oliver; Prather, Ben; Ramakrishnan, Venkatessh; Rao, Ramprasah; Rawlings, Mark G.; Raymond, Alexander W.; Rezzoll, Luciano; Ripperda, Bart; Roelof, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Rottmann, Helge; 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; Toma, Kenji; Torne, Pablo; Traianou, Efthalia; Trippe, Sascha; Tsuda, Shuichiro; Van Bemmel, Ilse; Van Langevelde, Huib Jan; Van Rossum, Daniel R.; Wagner, Jan; Wardle, John; Weintroub, Jonathan; Wex, Norbert; Wharton, Robert; Wielgus, Maciek; Wong, George N.; Wu., Qingwen; Yoon, Doosoo; Young, Andre; Young, Ken; Younsi, Ziri; 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) provides the unprecedented ability to directly resolve the structure and dynamics of black hole emission regions on scales smaller than their horizons. This has the potential to ...
  • 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 ...
  • Charge transfer states in phycobilisomes 
    Wahadoszamen, Md.; Kruger, T.P.J. (Tjaart); Ara, Anjue Mane; Van Grondelle, Rienk; Gwizdala, Michal (Elsevier, 2020-07)
    Phycobilisomes (PBs) absorb light and supply downstream photosynthetic processes with excitation energy in many cyanobacteria and algae. In response to a sudden increase in light intensity, excess excitation energy is ...
  • Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode 
    Rantho, Mologadi Nkiyasi; Madito, M.J. (Moshawe); Oyedotun, Kabir Oyeniran; Tarimo, Delvina Japhet; Manyala, Ncholu I. (American Institute of Physics, 2020-06)
    In this work, a birnessite-type MnO2/carbon composite with hierarchical nanostructures was synthesized using KMnO4 solution and spent printing carbon grains. A hybrid electrochemical supercapacitor device was fabricated ...
  • Zernike coefficients of a circular Gaussian pupil 
    Mafusire, Cosmas; Kruger, T.P.J. (Tjaart) (Taylor and Francis, 2020)
    We present a derivation of a formula for Zernike-Gauss circle coefficients expressed in terms of Zernike circle coefficients for a circular Gaussian pupil by revisiting a method in which theorthonormal Zernike-Gauss circle ...
  • How glyphosate will survive changes in herbicide use 
    Reinhardt, Carl Frederick (Charlie) (Plaas Media, 2019-12)
    Most commercial crop producers the world over will likely agree that glyphosate deserves to be hailed a once-ina-century herbicide. In stark contrast, many politicians and activists who lobby against genetically ...
  • High energy and excellent stability asymmetric supercapacitor derived from sulphur-reduced graphene oxide/manganese dioxide composite and activated carbon from peanut shell 
    Tarimo, Delvina Japhet; Oyedotun, Kabir Oyeniran; Mirghni, Abdulmajid Abdallah; Sylla, Ndeye Fatou; Manyala, Ncholu I. (Elsevier, 2020-09)
    Please read abstract in the article.
  • Graphene foam–based electrochemical capacitors 
    Oyedotun, Kabir Oyeniran; Manyala, Ncholu I. (Elsevier, 2020-06)
    Electrochemical capacitors (ECs) are a promising technology for energy storage, and future development of sustainable electrode materials is critical to developing these devices. The recent progress and earnest motivation ...
  • Ti- and Fe-related charge transition levels in beta-Ga2O3 
    Zimmermann, Christian; Frodason, Ymir Kalmann; Barnard, Abraham Willem; Varley, Joel Basile; Irmscher, Klaus; Galazka, Zbigniew; Karjalainen, Antti; Meyer, Walter Ernst; Auret, Francois Danie; Vines, Lasse (American Institute of Physics, 2020-02-18)
    Deep-level transient spectroscopy measurements on b-Ga2O3 crystals reveal the presence of three defect signatures labeled E2a; E2b, and E3 with activation energies at around 0.66 eV, 0.73 eV, and 0.95 eV below the conduction ...
  • GASP XXVI. HI gas in jellyfish galaxies : the case of JO201 and JO206 
    Ramatsoku, Mpati; Serra, Paolo; Poggianti, B.M.; Moretti, A.; Gullieuszik, M.; Bettoni, D.; Deb, T.; Franchetto, A.; Van Gorkom, J.H.; Jaffe, Y.; Tonnesen, S.; Verheijen, M.A.; Vulcani, B.; Andati, L.A.L.; De Blok, E.; Jozsa, Gyula I.G.; Kamphuis, Peter.; Kleiner, Dane; Maccagni, Filippo M.; Makhathini, Sphesihle; Molnar, Daniel Cs.; Ramaila, A.J.T.; Smirnov, Oleg M.; Thorat, Kshitij (EDP Sciences, 2020-08)
    Please read abstract in the article.
  • 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 ...
  • Characterization of sequential physical vapor deposited methylammonium lead tri-iodide perovskite thin films 
    Fru, Juvet Nche; Nombona, Nolwazi; Nombona, Nolwazi (Elsevier, 2020-12)
    Please read abstract in the article.
  • Structural and optical properties of hematite and L-arginine/hematite nanostructures prepared by thermal spray pyrolysis 
    Nyarige, Justine Sageka; Kruger, T.P.J. (Tjaart); Diale, M. (Mmantsae Moche) (Elsevier, 2020-03)
    A study of structural and optical properties of hematite and L-arginine/hematite films was carried out. Hematite films were deposited by thermal spray pyrolysis on fluorine-doped tin oxide at temperatures varying from 280 ...
  • Ex-situ nitrogen-doped porous carbons as electrode materials for high performance supercapacitor 
    Sylla, Ndeye Fatou; Ndiaye, Ndeye Maty; Ngom Balla Diop; Mutuma, B.K. (Bridget); Momodu, Damilola Y.; Chaker, Mohamed; Manyala, Ncholu I. (Elsevier, 2020-06)
    Please read abstract in the article.
  • Effect of porosity enhancing agents on the electrochemical performance of high-energy ultracapacitor electrodes derived from peanut shell waste 
    Sylla, Ndeye Fatou; Ndiaye, Ndeye Maty; Ngom, B.D.; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Mutuma, B.K. (Bridget); Manyala, Ncholu I. (Nature Research, 2019-09)
    Please read abstract in the article.
  • Towards the first detection of strongly lensed H I emission 
    Blecher, Tariq; Deane, Roger; Heywood, Ian; Obreschkow, Danail (Royal Astronomical Society, 2019-04)
    Please read abstract in the article.
  • Nitridation temperature effect on carbon vanadium oxynitrides for a symmetric supercapacitor 
    Ndiaye, Ndeye Maty; Sylla, Ndeye Fatou; Ngom, Balla D.; Mutuma, B.K. (Bridget); Dangbegnon, Julien K.; Ray, Sekhar C.; Manyala, Ncholu I. (MDPI, 2019-12)
    Please read abstract in article.