Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • Observation of low-temperature annealing of a primary defect in gallium nitride 
    Schmidt, Matthias; Janse van Rensburg, Pieter Johan; De Meyer, Hannes; Meyer, Walter Ernst; Auret, Francois Danie (Elsevier, 2014-04)
    Primary defects were introduced into n-type gallium nitride (GaN) thin films by 1.6 MeV-proton bombardment at 20 K. The electronic states of these defects were investigated by means of optical space charge spectroscopy. ...
  • On marginal deformations and non-integrability 
    Giataganas, Dimitrios; Zayas, Leopoldo A. Pando; Zoubos, Konstantinos (SpringerOpen Journal, 2014-01)
    We study the interplay between a particular marginal deformation of N = 4 super Yang-Mills theory, the β deformation, and integrability in the holographic setting. Using modern methods of analytic non-integrability of ...
  • On the combinatorics of partition functions in AdS3 /LCFT2 
    Mvondo-She, Yannick; Zoubos, Konstantinos (SpringerOpen, 2019-05-17)
    Three-dimensional Topologically Massive Gravity at its critical point has been conjectured to be holographically dual to a Logarithmic CFT. However, many details of this correspondence are still lacking. In this work, ...
  • Onion-derived activated carbons with enhanced surface area for improved hydrogen storage and electrochemical energy application 
    Nicholas M. Musyoka; Mutuma, B.K. (Bridget); Manyala, Ncholu I. (Royal Society of Chemistry, 2020-07)
    High surface area activated carbons (ACs) were prepared from a hydrochar derived from waste onion peels. The resulting ACs had a unique graphene-like nanosheet morphology. The presence of N (0.7%) and O content (8.1%) ...
  • Optical and electrical characterization of AlGaN based Schottky photodiodes after annealing at different temperatures 
    Ngoepe, Phuti Ngako Mahloka; Meyer, Walter Ernst; Diale, M. (Mmantsae Moche); Auret, Francois Danie; Van Schalkwyk, Louwrens (Elsevier, 2014-04)
    In this study a comparison is made between the optical and electrical properties of Ni/Au and Ni/Ir/Au Schottky photodiodes based on Al0.35Ga0.65N. The effects of inserting Ir between Ni and Au are of particular interest. ...
  • Optical properties of a nanoegg–nanorod heterodimer : a quasi-static analysis 
    Ugwuoke, Luke C.; Mancal, Tomas; Kruger, T.P.J. (Tjaart) (Optical Society of America, 2020-11)
    Plasmon coupling between the dipolar localized surface plasmons of a nanoegg and the longitudinal dipolar localized surface plasmons of a nearby gold nanorod is investigated within a dipolar-quasistatic limit. This was ...
  • Optical selection rules and scattering processes in rocksalt wide band gapZnO 
    Kunert, Herbert W.; Govender, Malcolm; Machatine, Augusto Gonçalo Jose; Mwakikunga, B.W.; Niyongabo, Prime (Wiley-Blackwell, 2014-02)
    At sufficiently high pressures, wurtzite structure zinc oxide (WZnO) can be transformed to the cubic rocksalt (R-ZnO) structure. The R-ZnO exhibits semiconductor behavior with an indirect wide band gap of Eg ¼ 5:5 eV. ...
  • Optimal quantum channels 
    Duvenhage, Rocco de Villiers (American Physical Society, 2021-09-07)
    A method to optimize the cost of a quantum channel is developed. The goal is to determine the cheapest channel that produces prescribed output states for a given set of input states. This is essentially a quantum version ...
  • Optimisation of the synthesis of ZrC coatings in a radio frequency induction-heating chemical vapour deposition system using response surface methodology 
    Biira, Saphina; Crouse, Philippus L.; Bissett, H.; Alawad, B.A.B.; Hlatshwayo, Thulani Thokozani; Nel, J.T.; Malherbe, Johan B. (Elsevier, 2017-02)
    A chemical vapour deposition process using radio frequency induction heating operating at atmospheric pressure was developed for the deposition of ZrC coatings. The precursors utilised in this process were zirconium ...
  • 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, ...
  • Optimization of processing parameters for the preparation of dip-coated CuO photocathodes and modification with Au nanoparticles for water-splitting 
    Mosalakgotla, Nteseng D.M.; Kyesmen, Pannan Isa; Diale, M. (Mmantsae Moche) (Elsevier, 2023-03)
    Here, the processing parameters for preparing dip-coated CuO photocathodes such as withdrawal velocity, film thickness, and calcination temperature were optimized for photoelectrochemical (PEC) applications. CuO films were ...
  • Optoelectronic characterization of Au/Ni/n-AIGaN photodiodes after annealing at different temperatures 
    Ngoepe, Phuti Ngako Mahloka; Meyer, Walter Ernst; Diale, M. (Mmantsae Moche); Auret, Francois Danie; Van Schalkwyk, Louwrens (Elsevier, 2012-06)
    Please read abstract in the article.
  • Ordered magnetic fields around the 3C 84 central black hole 
    Paraschos, Georgios Filippos; Kim, J.-Y.; Wielgus, Maciek; Röder, J.; Krichbaum, Thomas P.; Ros, Eduardo; Agudo, Iván; Myserlis, Ioannis; Moscibrodzka, Monika; Traianou, Efthalia; Zensus, J. Anton; Blackburn, Lindy; Chan, Chi-kwan; Issaoun, Sara; Janssen, Michael; Johnson, M.D.; Fish, Vincent L.; Akiyama, Kazunori; Alberdi, A.; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, J.; Bauböck, Michi; Benson, Bradford A.; Bintley, Dan; Blundell, R.; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Bustamante, Sandra; Byun, Do-Young; Carlstrom, John E.; Ceccobello, Chiara; Chael, A.; Chang, Dominic O.; Chatterjee, K.; Chatterjee, Shami; Chen, Ming-Tang; Chen, Y.; Cheng, Xiaopeng; Cho, I.; Christian, P.; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Y.; Dahale, Rohan; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Dhruv, Vedant; Doeleman, Sheperd S.; Dougal, Sean; Dzib, Sergio A.; Eatough, Ralph P.; Emami, Razieh; Falcke, Heino; Farah, Joseph; Fomalont, Ed; Ford, H. Alyson; Foschi, Marianna; Fraga-Encinas, Raquel; Freeman, William T.; Friberg, Per; Fromm, Christian M.; Fuentes, Antonio; Galison, Peter; Gammie, Charles F.; García, R.; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gold, R.; Gomez-Ruiz, Arturo I.; Gomez, Jose L.; Gu (顾敏峰), Minfeng; Gurwell, Mark; Hada, Kazuhiro; Haggard, Daryl; Haworth, Kari; Hecht, Michael H.; Hesper, Ronald; Heumann, Dirk; Ho (何子山), Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang (黄磊), Lei; Hughes, David H.; Ikeda, Shiro; Impellizzeri, C. M. Violette; Inoue, Makoto; James, D. J.; Jannuzi, Buell T.; Jeter, Britton; Jaing, W.; Jimenez-Rosales, Alejandra; Jorstad, Svetlana; Joshi, Jayneel A.; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, D.-J.; Kim, J.; Kino, Motoki; Koay, Jun Yi; Kocherlakota, Prashant; Kofuji, Yutaro; Koch, Patrick M.; Koyama, Shoko; Kramer, Carsten; Kramer, J.A.; Kramer, Michael; Kuo, Cheng-Yu; La Bella, Noemi; Lauer, Tod R.; Lee, Daeyoung; Lee, S.-S.; Leung, Po Kin; Levis, Aviad; Li, Z.; Lico, Rocco; Lindahl, Greg; Lindqvist, Michael; Lisakov, Mikhail; Liu, J.; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin J.; Lowitz, A.E.; Lu, Ru-Sen; MacDonald, Nicholas R.; Mao, Jirong; Marchili, Nicola; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Michalik, Daniel; Mizuno, Izumi; Mizuno, Yosuke; Moran, James M.; Moriyama, Kotaro; Mulaudzi, Wanga; Müller, C.; Müller, H.; Mus, Alejandro; Musoke, Gibwa; Nadolski, Andrew; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayanan, Gopal; Natarajan, Iniyan; Nathanail, Antonios; Navarro Fuentes, Santiago; Neilsen, Joey; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Nowak, Michael A.; Oh, Junghwan; Okino, Hiroki; Olivares, Hector; Ortiz-Leon, Gisela N.; Oyama, Tomoaki; Ozel, Feryal; Palumbo, Daniel C. M.; Park, Jongho; Parsons, Harriet; Patel, Nimesh; Pen, Ue-Li; Pietu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Porth, Oliver; Pötzl, Felix M.; Prather, Ben; Preciado-Lopez, Jorge A.; Psaltis, Dimitrios; Pu, Hung-Yi; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Ricarte, Angelo; Ripperda, Bart; Roelofs, Freek; Rogers, Alan; Romero-Cañizales, Cristina; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruiz, Ignacio; Ruszczyk, Chet; Rygl, Kazi L. J.; Sanchez, Salvador; Sanchez-Arguelles, David; Sanchez-Portal, Miguel; Sasada, Mahito; Satapathy, Kaushik; Savolainen, Tuomas; Schloerb, F. Peter; Schonfeld, Jonathan; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Sosapanta Salas, León David; Souccar, Kamal; Sun, He; Tazaki, Fumie; Tetarenko, Alexandra J.; Tiede, Paul; Tilanus, Remo P. J; Titus, Michael; Torne, Pablo; Toscano, T.; Trent, Tyler; Trippe, Sascha; Turk, Matthew; Van Bemmel, Ilse; van Langevelde, Huib Jan; Van Rossum, Daniel R.; Vos, Jesse; Wagner, Jan; Ward-Thompson, Derek; Wardle, John; Washington, J.E.; Weintroub, Jonathan; Wharton, Robert; Wiik, Kaj; Witzel, Gunther; Wondrak, Michael F.; Wong, George N.; Wu, Qingwen; Yadlapalli, N.; Yamaguchi, Paul; Yfantis, Aristomenis Ilias; Yoon, Doosoo; Young, Andre; Young, K.; Younsi, Ziri; Yu, W.; Yuan, Feng; Yuan, Ye-Fei; Zhang, Shuo; Zhao, Guang-Yao; Zhao, Shan-Shan (EDP Sciences, 2024-02)
    Please read abstract in article.
  • The origin of irreversibility and thermalization in thermodynamic processes 
    Roduner, Emil; Kruger, T.P.J. (Tjaart) (Elsevier, 2022-01)
    Understanding the origin of irreversibility in thermodynamics has been a fundamental scientific challenge and puzzle for nearly a century. Initially, the discussions related to classical thermodynamic systems, but recently ...
  • Orthonormal vector general polynomials derived from the Cartesian gradient of the orthonormal Zernike-based polynomials 
    Mafusire, Cosmas; Kruger, T.P.J. (Tjaart) (Optical Society of America, 2018-06)
    The concept of orthonormal vector circle polynomials is revisited by deriving a set from the Cartesian gradient of Zernike polynomials in a unit circle using a matrix-based approach. The heart of this model is a closed-form ...
  • P3HT:PCBM/nickel-aluminum layered double hydroxide-graphene foam composites for supercapacitor electrodes 
    Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Barzegar, Farshad; Fabiane, Mopeli; Manyala, Ncholu I. (Springer, 2015-02)
    In this paper, a simple dip-coating technique is used to deposit a P3HT:PCBM/Nickel Aluminum layered double hydroxide-graphene foam (NiAl-LDH-GF) composite onto a nickel foam (NF) serving as a current collector. A ...
  • Partial widths of a multi-channel resonance 
    Rakityansky, Sergei Anatoljevich (IOP Publishing Limited, 2017)
    A new method for finding the partial decay-widths for multi-channel resonances is suggested. It is based on using the Jost matrices. These matrices can be either calculated (when the multi-channel potential is known) or ...
  • The persistent shadow of the supermassive black hole of M 87 I. Observations, calibration, imaging, and analysis 
    Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Bandyopadhyay, Bidisha; Barrett, John; Bauböck, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Bustamante, Sandra; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chang, Dominic O.; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Dahale, Rohan; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Dhruv, Vedant; Dihingia, Indu K.; Doeleman, Sheperd S.; Dzib, Sergio A.; Eatough, Ralph P.; Emami, Razieh; Falcke, Heino; Farah, Joseph; Fish, Vincent L.; Fomalont, Ed; Ford, H. Alyson; Foschi, Marianna; Fraga-Encinas, Raquel; Freeman, William T.; Friberg, Per; Fromm, Christian M.; Fuentes, Antonio; Galison, Peter; Gammie, Charles F.; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gold, Roman; Gomez-Ruiz, Arturo I.; Gomez, Jose L.; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Haggard, Daryl; Hesper, Ronald; Heumann, Dirk; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; Ikeda, Shiro; Impellizzeri, C. M. Violette; Inoue, Makoto; Issaoun, Sara; James, David J.; Jannuzi, Buell T.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jones, Adam C.; Joshi, Abhishek V.; Jung, Taehyun; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, Dong-Jin; Kim, Jae-Young; Kim, Jongsoo; Kim, Junhan; Kino, Motoki; Koay, Jun Yi; Kocherlakota, Prashant; Kofuji, Yutaro; Koch, Patrick M.; Koyama, Shoko; Kramer, Carsten; Kramer, J.A.; Kramer, Michael; Krichbaum, Thomas P.; Kuo, Cheng-Yu; La Bella, Noemi; Lee, Sang-Sung; Levis, Aviad; Li, Zhiyuan; Lico, Rocco; Lindahl, Greg; Lindqvist, Michael; Lisakov, Mikhail; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin J.; Lowitz, A.E.; Lu, Ru-Sen; MacDonald, Nicholas R.; Mao, Jirong; Marchili, Nicola; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Mizuno, Izumi; Mizuno, Yosuke; Montgomery, Joshua; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Mulaudzi, Wanga; Muller, Cornelia; Müller, H.; Mus, Alejandro; Musoke, Gibwa; Myserlis, Ioannis; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayanan, Gopal; Natarajan, Iniyan; Nathanail, Antonios; Navarro Fuentes, Santiago; Neilsen, Joey; Ni, Chunchong; Nowak, Michael A.; Oh, Junghwan; Okino, Hiroki; Olivares, Hector; Oyama, Tomoaki; Ozel, Feryal; Palumbo, Daniel C. M.; Paraschos, Georgios Filippos; Park, Jongho; Parsons, Harriet; Patel, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Pietu, Vincent; PopStefanija, Aleksandar; Porth, Oliver; Prather, Ben; Psaltis, Dimitrios; Pu, Hung-Yi; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Ricarte, Angelo; Ripperda, Bart; Roelofs, Freek; Romero-Cañizales, Cristina; Ros, Eduardo; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruiz, Ignacio; Ruszczyk, Chet; Rygl, Kazi L. J.; Sanchez, Salvador; Sánchez-Argüelles, David; Sánchez-Portal, Miguel; Sasada, Mahito; Satapathy, Kaushik; Savolainen, Tuomas; Schloerb, F. Peter; Schonfeld, Jonathan; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Sosapanta Salas, León David; Souccar, Kamal; Sun, He; Tazaki, Fumie; Tetarenko, Alexandra J.; Tiede, Paul; Tilanus, Remo P. J.; Titus, Michael; Toma, Kenji; Torne, Pablo; Toscano, Teresa; Traianou, Efthalia; Trent, Tyler; Trippe, Sascha; Turk, Matthew; Van Bemmel, Ilse; Van Langevelde, Huib Jan; Van Rossum, Daniel R.; Vos, Jesse; Wagner, Jan; Ward-Thompson, Derek; Wardle, John; Washington, Jasmin E.; Weintroub, Jonathan; Wharton, Robert; Wielgus, Maciek; Wiik, Kaj; Witzel, Gunther; Wondrak, Michael F.; Wong, George N.; Wu, Qingwen; Yadlapalli, Nitika; Yamaguchi, Paul; Yfantis, Aristomenis; Yoon, Doosoo; Young, Andre; Younsi, Ziri; Yu, Wei; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. Anton; Zhang, Shuo; Zhao, Guang-Yao; Zhao, Shan-Shan; Allardi, Alexander; Chang, Shu-Hao; Chang, Chih-Cheng; Chang, Song-Chu; Chen, Chung-Chen; Chilson, Ryan; Rodríguez-Montoya, Iván; Shaw, Paul; Snow, William; Sridharan, Tirupati Kumara; Srinivasan, Ranjani; Wei, Ta-Shun; Yu, Chen-Yu (EDP Sciences, 2024-01)
    Please read abstract in article.
  • Phase evolution of vanadium oxides obtained through temperature programmed calcinations of ammonium vanadate in hydrogen atmosphere and their humidity sensing properties 
    Akande, A.A.; Linganiso, E.C.; Dhonge, B.P.; Rammutla, K.E.; Machatine, Augusto Gonçalo Jose; Prinsloo, Linda Charlotta; Kunert, Herbert W.; Mwakikunga, B.W. (Elsevier, 2015-02)
    The possibility of obtaining vanadium dioxide (VO2) [wherein the vanadium ionic state is 4þ] from a precursor of ammonium metavanadate (NH4VO3) bearing the ion V5þ is investigated. The reduction is carried out by calcining ...
  • Photoelectrochemical performance and ultrafast dynamics of photogenerated electrons and holes in highly titanium-doped hematite 
    Paradzah, Alexander Tapera; Maabong-Tau, Kelebogile; Diale, M. (Mmantsae Moche); Kruger, T.P.J. (Tjaart) (Royal Society of Chemistry, 2020-11)
    Please read abstract in the article.