Browsing Research Articles (Physics) by Title

Browsing Research Articles (Physics) by Title

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  • 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 ...
  • Current–temperature measurements of a SBD evaporated onto inductively coupled plasma cleaned germanium 
    Coelho, Sergio M.M.; Auret, Francois Danie; Myburg, G.; Janse van Rensburg, Pieter Johan; Meyer, Walter Ernst (Elsevier, 2009)
    Inductively coupled plasma (ICP) etching has been used primarily on compound semiconductors. There are however compelling reasons to study the effects of ICP etching on Ge. Pd Schottky barrier diodes (SBDs) were resistively ...
  • Cycling and floating performance of symmetric supercapacitor derived from coconut shell biomass 
    Barzegar, Farshad; Khaleed, Abubakar A.; Ugbo, F.U.; Oyeniran, K.O.; Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I. (American Institute of Physics, 2016)
    This work present two-step synthesizes route to low-cost mesoporous carbon from coconut shell. The electrochemical characterization of the coconut shell based activated carbon (CSAC) material as electrode for supercapacitor ...
  • C∗ -fermi systems and detailed balance 
    Crismale, Vitonofrio; Duvenhage, Rocco de Villiers; Fidaleo, Francesco (Springer, 2021-03)
    Please read abstract in the article.
  • Damage formation and optical absorption in neutron irradiated SiC 
    Wendler, E.; Bierschenk, Th.; Felgentrager, F.; Sommerfeld, J.; Wesch, W.; Alber, D.; Bukalis, G.; Prinsloo, Linda Charlotta; Van der Berg, Nic (Nicolaas George); Friedland, Erich Karl Helmuth; Malherbe, Johan B. (Elsevier, 2012-09)
    The defect formation in neutron irradiated SiC was investigated by means of Rutherford backscattering spectrometry in channelling mode (RBS), optical absorption and Raman spectroscopy. The relative defect concentration ...
  • Damage formation in Ge during Ar+ and He+ implantation at 15 K 
    Hayes, M.; Schroeter, A.; Wendler, E.; Wesch, W.; Auret, Francois Danie; Nel, Jacqueline Margot (Elsevier, 2009)
    Read abstract in article.
  • dc-Hydrogen plasma induced defects in bulk n-Ge 
    Nyamhere, Cloud; Venter, Andre; Murape, D.M.; Auret, Francois Danie; Coelho, Sergio M.M.; Botha, J.R. (Elsevier, 2012-08)
    Bulk antimony doped germanium (n-Ge) has been exposed to a dc-hydrogen plasma. Capacitance-voltage depth profiles revealed extensive near surface passivation of the shallow donors as evidenced by ˜ a 1.5 orders of magnitude ...
  • Deciphering the structural, textural, and electrochemical properties of activated BN-doped spherical carbons 
    Mutuma, B.K. (Bridget); Boitumelo J. Matsoso; Momodu, Damilola Y.; Oyedotun, Kabir Oyeniran; Coville, Neil J.; Manyala, Ncholu I. (MDPI Publishing, 2019-03-16)
    In this study, the effect of K2CO3 activation on the structural, textural, and electrochemical properties of carbon spheres (CSs) and boron and nitrogen co-doped carbon spheres (BN-CSs) was evaluated. Activation of the ...
  • Deconvolution models for determining the real surface composition of InP (1 0 0) after bombardment with 5 keV Ar ions at different angles 
    Odendaal, R.Q. (Quintin); Malherbe, Johan B. (Elsevier, 2019-12)
    Low energy ion bombardment can induce compositional changes in the surfaces of compound materials. A fundamental problem is to determine which of the two main mechanisms caused the compositional change, viz. preferential ...
  • Deep level transient spectroscopy (DLTS) study of defects introduced in antimony doped Ge by 2 MeV proton irradiation 
    Nyamhere, Cloud; Das, A.G.M.; Auret, Francois Danie; Chawanda, Albert; Pineda-Vargas, C.A.; Venter, Andre (Elsevier, 2011-08)
    Please read the abstract in the article.
  • Defect charge states in Si doped hexagonal boron-nitride monolayer 
    Mapasha, Refilwe Edwin; Molepo, Mahlanga P.; Andrew, Richard Charles; Chetty, Nithaya (IOP Publishing, 2016-02)
    We perform ab initio density functional theory calculations to investigate the energetics, electronic and magnetic properties of isolated stoichiometric and non-stoichiometric substitutional Si complexes in a hexagonal ...