Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • Classical typicality of the canonical distribution 
    Plastino, Angel Ricardo (Angelo); Daffertshofer, A. (EPLA, 2008-11)
    We consider the typicality of the canonical ensemble’s probability distribution from a classical perspective, resuming recent discussions on quantum-mechanical aspects of canonical typicality. In the conventional derivation ...
  • Cobalt silicide formation on a Si(1 0 0) substrate in the presence of an interfacial (Fe90Zr10) interlayer 
    Abrass, Hameda A.; Theron, C.C. (Chris); Njoroge, Eric Gitau; Van der Berg, Nic (Nicolaas George); Botha, A.J.; Yan, X- L.; Terblans, J.J. (Elsevier, 2015-09)
    The reaction between a thin film (126 nm) of Co and Si has been studied at 450 C for 24 h under high vacuum conditions, in the presence of a FeZr barrier layer. Without a diffusion barrier layer between Co and Si, Co2Si ...
  • Collimated synchrotron threads linking the radio lobes of ESO 137-006 
    Ramatsoku, Mpati; Murgia, M.; Vacca, V.; Serra, P.; Makhathini, Sphesihle; Govoni, F.; Smirnov, Oleg M.; Andati, L.A.L.; De Blok, E.; Józsa, G.I.G.; Kamphuis, P.; Kleiner, D.; Maccagni, F.M.; Molnár, D.C.; Ramaila, A.J.T.; Thorat, Kshitij; White, Sarah V. (EDP Sciences, 2020-04)
    We present MeerKAT 1000 MHz and 1400 MHz observations of a bright radio galaxy in the southern hemisphere, ESO 137-006. The galaxy lies at the centre of the massive and merging Norma galaxy cluster. The MeerKAT continuum ...
  • A compact streak camera for 150 fs time resolved measurement of bright pulses in ultrafast electron diffraction 
    Kassier, Gunther Horst; Haupt, K.; Erasmus, N.; Rohwer, E.G.; Von Bergmann, H.M.; Schwoerer, H.; Coelho, Sergio M.M.; Auret, Francois Danie (American Institute of Physics (AIP), 2010-10)
    We have developed a compact streak camera suitable for measuring the duration of highly charged subrelativistic femtosecond electron bunches with an energy bandwidth in the order of 0.1%, as frequently used in ultrafast ...
  • Comparative study of the electrical properties of Pd/ZnO Schottky contacts fabricated using electron beam deposition and resistive/thermal evaporation techniques 
    Mtangi, Wilbert; Auret, Francois Danie; Janse van Rensburg, Pieter Johan; Coelho, Sergio M.M.; Legodi, Matshisa Johannes; Meyer, Walter Ernst; Chawanda, Albert (American Institute of Physics, 2011-11)
    A systematic investigation to check the quality of Pd Schottky contacts deposited on ZnO has been performed on electron beam (e-beam) deposited and resistively/thermally evaporated samples using current-voltage, IV, and ...
  • A comparative study on the properties of ErxZn1−xO and SmxZn1−xO nanostructured thin films for electronic device applications 
    Nyarige, Justine Sageka; Nambala, Fred Joe; Diale, M. (Mmantsae Moche) (Elsevier, 2022-12)
    In this study, the undoped, Erbium (Er) doped and Samarium (Sm) doped (1, 3, and 5 wt%) ZnO were synthesized using spray pyrolysis. X-ray diffraction patterns confirmed ZnO with strong diffraction peaks indexed in their ...
  • Comparison of ionic liquid electrolyte to aqueous electrolytes on carbon nanofibres supercapacitor electrode derived from oxygen-functionalized graphene 
    Oyedotun, Kabir Oyeniran; Masikhwa, T.M. (Tshifhiwa); Lindberg, Simon; Matic, Aleksandar; Johansson, Patrik; Manyala, Ncholu I. (Elsevier, 2019-11)
    A facial force-driven reflux technique was used to develop fibre-like carbon material from freeze-dried reduced graphene oxide (RGO) firstly prepared by using a modified Hummers method. The carbon nanofibres displayed a ...
  • Comparison of nickel, cobalt, palladium, and tungsten Schottky contacts on n-4H-silicon carbide 
    Gora, V.E.; Chawanda, A.; Nyamhere, C.; Auret, Francois Danie; Mazunga, F.; Jaure, T.; Chibaya, B.; Omotoso, Ezekiel; Danga, Helga Tariro; Tunhuma, Shandirai Malven (Elsevier, 2018-04)
    We have investigated the current-voltage (I-V) characteristics of nickel (Ni), cobalt (Co), tungsten (W) and palladium (Pd) Schottky contacts on n-type 4H-SiC in the 300–800 K temperature range. Results extracted from I-V ...
  • Comparison of two models for phonon assisted tunneling field enhanced emission from defects in Ge measured by DLTS 
    Pienaar, J.; Meyer, Walter Ernst; Auret, Francois Danie; Coelho, Sergio M.M. (Elsevier, 2012-05)
    Deep Level Transient Spectroscopy (DLTS) was used to measure the field enhanced emission rate from a defect introduced in n-type Ge. The defect was introduced through low energy (±80 eV) inductively coupled plasma (ICP) ...
  • Competitive growth texture of pulse laser deposited VO2 nanostructures on a glass substrate 
    Ngom, Balla D.; Chaker, M.; Madiba, I.G.; Khamlich, Saleh; Manyala, Ncholu I.; Nemraoui, O.; Madjoe, R.; Beye, A.C.; Maaza, Malik; Diallo, A. (Elsevier, 2014)
    We report on the crystal structure and morphology of vanadium dioxide (VO2) nanostructures synthesized by pulsed laser deposition on soda-lime glass substrates. The VO2 nanostructures exhibit sharp a-axis diffraction ...
  • 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.
  • Conformational switching in a light-harvesting protein as followed by single-molecule spectroscopy 
    Gall, Andrew; Ilioaia, Cristian; Kruger, T.P.J. (Tjaart); Novoderezhkin, Vladimir I.; Robert, Bruno; Van Grondelle, Rienk (Biophysical Society, 2015-06)
    Among the ultimate goals of protein physics, the complete, experimental description of the energy paths leading to protein conformational changes remains a challenge. Single protein fluorescence spectroscopy constitutes ...
  • Coniferous pine biomass : a novel insight into sustainable carbon materials for supercapacitors electrode 
    Manyala, Ncholu I.; Bello, Abdulhakeem; Barzegar, Farshad; Khaleed, Abubakar A.; Momodu, Damilola Y.; Dangbegnon, Julien K. (Elsevier, 2016-10)
    Low-cost biomass-derived activated porous carbon from natural pine cones is synthesized using hydrothermal approach followed by KOH activation and carbonization. The produced carbon materials have a high surface area of ...
  • Constraints on black-hole charges with the 2017 EHT observations of M87* 
    Kocherlakota, Prashant; Rezzolla, Luciano; Falcke, Heino; Fromm, Christian M.; Kramer, Michael; Mizuno, Yosuke; Nathanail, Antonios; Olivares, Hector; Younsi, Ziri; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Doeleman, Sheperd S.; Eatough, Ralph P.; Farah, Joseph (American Physical Society, 2021-05-20)
    Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M87* shadow size to infer constraints on the ...
  • Controlling light harvesting with light 
    Gwizdala, Michal; Berera, Rudi; Kirilovsky, Diana; Van Grondelle, Rienk; Kruger, T.P.J. (Tjaart) (American Chemical Society, 2016-09)
    When exposed to intense sunlight all organisms performing oxygenic photosynthesis implement various photoprotective strategies to prevent potentially lethal photodamage. The rapidly responding photoprotective mechanisms, ...
  • Correlation between barrier heights and ideality factors of Ni/n-Ge (100) schottky barrier diodes 
    Chawanda, Albert; Nel, Jacqueline Margot; Auret, Francois Danie; Mtangi, Wilbert; Nyamhere, Cloud; Diale, M. (Mmantsae Moche); Leach, Lindsay Josephine (Korean Physical Society, 2010-12)
    We computed the homogeneous Schottky barrier height (SBH) at ideality factor (n) = 1.0 of Ni/n- Ge (100) Schottky diodes (SDs). The SDs were identically prepared by using resistive evaporation of Ni on n-Ge (100). The ...
  • Critical exponents in percolation model of track region 
    Demchyshyn, A.B.; Selyshchev, Pavel (Sumy State University, 2012-03-14)
    Numerous experiments on defect formation in insulators, metals, alloys, and amorphous semiconductors have shown that these materials are sensitive to track formation when they are bombarded by swift heavy ions (SHI). Detail ...
  • Crystal structure changes and weight kinetics of silicon-hexaboride under gamma irradiation dose 
    Mirzayev, M.N.; Jabarov, S.H.; Asgerov, E.B.; Mehdiyeva, R.N.; Thabethe, Thabsile Theodora; Biira, S.; Tiep, N.V. (Elsevier, 2018-09)
    The silicide hexaboride (B6Si) was irradiated with 60Co at room temperature to study the structural changes and weight kinetics. The B6Si samples were irradiated using a gamma source with a dose rate (D) of 0.27 Gy/s. At ...
  • Cu nanoclusters in ion exchanged soda-lime glass : study of SPR and nonlinear optical behavior for photonics 
    Kumar, Promod; Mathpal, Mohan Chandra; Hamad, Syed; Rao, Soma Venugopal; Neethling, Johannes Henoch; Janse van Vuuren, Arno; Njoroge, Eric Gitau; Kroon, Robin E.; Roos, Wiets D.; Swart, Hendrik C. (Elsevier, 2019-06)
    Please read abstract in the article.
  • Current-voltage temperature characteristics of Au/n-Ge (1 0 0) Schottky diodes 
    Chawanda, Albert; Mtangi, Wilbert; Auret, Francois Danie; Nel, Jacqueline Margot; Nyamhere, Cloud; Diale, M. (Mmantsae Moche) (Elsevier, 2012-05)
    The variation in electrical characteristics of Au/n-Ge (1 0 0) Schottky contacts have been systematically investigated as a function of temperature using current-voltage (I-V) measurements in the temperature range 140-300 ...