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Physics: Recent submissions

  • 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 ...
  • First Sagittarius A Event Horizon Telescope results. VI. Testing the black hole metric 
    Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Barrett, John; Baubock, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; 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, Andrew; Chan, Chi-kwan; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen (陈永军), Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger (IOP Publishing, 2022-05-10)
    Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies Einstein’s equations and does not ...
  • First Sagittarius A Event Horizon Telescope results. IV. Variability, morphology, and black hole mass 
    Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Barrett, John; Baubock, Michi; Benson, Bradford A.; Blackburn, Lindy; Blundell, Raymond; 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, Andrew; Chan, Chi-kwan; Chatterjee, Koushik; Chatterjee, Shamiuntranslated; Chen, Ming-Tang; Chen (陈永军), Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger (IOP Publishing, 2022-05-10)
    Please read abstract in the article.
  • First Sagittarius A Event Horizon Telescope results. III. Imaging of the Galactic center supermassive black hole 
    Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Barrett, John; Baubock, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; 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, Andrew; Chan, Chi-kwan; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen (陈永军), Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger (IOP Publishing, 2022-05-10)
    We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm. Imaging of Sgr A* has been conducted through surveys ...
  • Resolving the inner parsec of the blazar J1924–2914 with the Event Horizon Telescope 
    Issaoun, Sara; Wielgus, Maciek; Jorstad, Svetlana; Krichbaum, Thomas P.; Blackburn, Lindy; Janssen, Michael; Chan, Chi-kwan; Pesce, Dominic W.; Gomez, Jose L.; Akiyama, K.; Moscibrodzka, Monika; Marti-Vidal, Ivan; Chael, Andrew; Lico, Rocco; Liu, Jun; Ramakrishnan, Venkatessh; Lisakov, Mikhail; Fuentes, Antonio; Zhao, Guang-Yao; Moriyama, Kotaro; Broderick, Avery E.; Tiede, Paul; MacDonald, Nicholas R.; Mizuno, Yosuke; Traianou, Efthalia; Loinard, Laurent; Davelaar, Jordy; Gurwell, Mark; Lu, Ru-Sen; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Barrett, John; Baubock, Michi; Benson, Bradford A.; Bintley, Dan; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broguiere, Dominique; Bronzwaer, Thomas; Bustamante, Sandra; Byun, Do-Young; Carlstrom, John E.; Ceccobello, Chiara; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cho; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; De Laurentis, Mariafelicia; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Doeleman, Sheperd S.; Dhruv, Vedant; Quijano, Sergio Abraham Dzib; Eatough, Ralph P.; Emami, Razieh; Falcke, Heino; Farah, Joseph; Fish, Vincent L.; Fomalont, Ed; Ford, H. Alyson; Fraga-Encinas, Raquel; Freeman, William T.; Friberg, Per; Fromm, Christian M.; Galison, Peter; Gammie, Charles F.; Garcia, Roberto; Gentaz, Olivier; Georgiev, B.; Goddi, C.; Gold, Roman; Gomez-Ruiz, Arturo I.; Gu, Minfeng; Hada, Kazuhiro; Haggard, Daryl; Hecht, Michael H.; Hesper, Ronald; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H. (IOP Publishing, 2022-08-01)
    The blazar J1924–2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic center’s black hole Sagittarius A*. Here we present the first total and linearly polarized intensity images of this source ...
  • A study of porous carbon structures derived from composite of cross-linked polymers and reduced graphene oxide for supercapacitor applications 
    Bakhoum, Daba T.; Oyedotun, Kabir Oyeniran; Sarr, Samba; Sylla, Ndeye Fatou; Maphiri, Vusani Muswa; Ndiaye, Ndeye Maty; Ngom, Balla D.; Manyala, Ncholu I. (Elsevier, 2022-07)
    Please read abstract in the article.
  • Facile and sustainable technique to produce low-cost high surface area mangosteen shell activated carbon for supercapacitors applications 
    Kitenge, Vianney Ngoyi; Tarimo, Delvina Japhet; Oyedotun, Kabir Oyeniran; Rutavi, Gift; Manyala, Ncholu I. (Elsevier, 2022-12)
    Please read abstract in the article.
  • Recycling of biomass wastes from amarula husk by a modified facile economical water salt method for high energy density ultracapacitor application 
    Tarimo, Delvina Japhet; Mirghni, Abdulmajid Abdallah; Oyedotun, Kabir Oyeniran; Rutavi, Gift; Kitenge, Vianney Ngoyi; Manyala, Ncholu I. (Elsevier, 2022-09)
    Please read abstract in the article.
  • Waste chicken bone-derived porous carbon materials as high performance electrode for supercapacitor applications 
    Tarimo, Delvina Japhet; Oyedotun, Kabir Oyeniran; Sylla, Ndeye Fatou; Mirghni, Abdulmajid Abdallah; Ndiaye, Ndeye Maty; Manyala, Ncholu I. (Elsevier, 2022-07)
    Please read abstract in the article.
  • An ab-initio study of P-type ZrCoY (Y[dbnd]Sb and Bi) half – Heusler semiconductors 
    Allan, Lynet; Mulwa, Winfred M.; Mwabora, Julius M.; Musembi, Robinson J.; Mapasha, Refilwe Edwin (Elsevier, 2023-08)
    Please read abstract in article.
  • Effects of helium ion irradiation on tungsten-based composites : neutron diffraction; as a real-time diffractometer 
    Neov, D.; Beskrovnyi, A.I.; Abiyev, A.S.; Mirzayeva, D.M.; Demir, E.; Valizade, A.H.; Hlatshwayo, Thulani Thokozani; Thabethe, Thabsile Theodora; Samedov, O.A.; Mehdiyeva, R.N.; Hasanov, K.; Sharipov, Z.A.; Doroskevich, A.S.; Mamedov, F. (Jomard Publishin, 2023-06-23)
    The weight ratio 6% was formed for this paper by B4C-2% (99.5% purity, 20 µm particle size), TiC-1% (99.5% purity, 15 µm particle size), C (99.5% purity, 21 µm particle size) and the remaining part is tungsten W (99.5% ...
  • Insecticide monitoring in cattle dip with an e-nose system and room temperature screen-printed ZnO gas sensors 
    Rohde, Archibald W.; Nel, Jacqueline Margot; Joubert, Trudi-Heleen (MDPI, 2023-07-26)
    Taktic, an Amitraz-based insecticide, is commonly used in sub-Saharan Africa to treat cattle for ticks. Due to misuse in rural dipping pools, some ticks are showing resistance to Taktic. This work presents a low-cost e-nose ...
  • Mono-doped and co-doped nanostructured hematite for improved photoelectrochemical water splitting 
    Nyarige, Justine Sageka; Paradzah, Alexander Tapera; Kruger, T.P.J. (Tjaart); Diale, M. (Mmantsae Moche) (MDPI, 2022-01-24)
    In this study, zinc-doped (a-Fe2O3:Zn), silver-doped (a-Fe2O3:Ag) and zinc/silver codoped hematite (a-Fe2O3:Zn/Ag) nanostructures were synthesized by spray pyrolysis. The synthesized nanostructures were used as photoanodes ...
  • Modeling and X-ray analysis of defect nanoclusters formation in B4C under ion irradiation 
    Mirzayev, Matlab N.; Donkov, Alexander A.; Popov, Evgeni A.; Demir, Ertugrul; Jabarov, Sakin H.; Chkhartishvili, Levan S.; Adeojo, S.A.; Doroshkevich, Aleksandr S.; Sidorin, Alexey A.; Asadov, Asif G.; Thabethe, Thabsile Theodora; Khandaker, Mayeen U.; Alamri, Sultan; Osman, Hamid; Trukhanov, Alex V.; Trukhanov, Sergei V. (MDPI, 2022-07-31)
    Please read abstract in the article.
  • Facile Zn and Ni Co-doped hematite nanorods for efficient photocatalytic water oxidation 
    Talibawo, Joan; Kyesmen, Pannan Isa; Cyulinyana, Marie C.; Diale, M. (Mmantsae Moche) (MDPI, 2022-08-27)
    In this work, we report the effect of zinc (Zn) and nickel (Ni) co-doping of hydrothermally synthesized hematite nanorods prepared on fluorine-doped tin oxide (FTO) substrates for enhanced photoelectrochemical (PEC) water ...
  • Impact of thermally reducing temperature on graphene oxide thin films and microsupercapacitor performance 
    Maphiri, Vusani M.; Bakhoum, Daba T.; Sarr, Samba; Sylla, Ndeye Fatou; Rutavi, Gift; Manyala, Ncholu I. (MDPI, 2022-06-28)
    In this work, a thermally reduced graphene oxide (TRGO) thin film on microscopic glass was prepared using spray coating and atmospheric pressure chemical vapour deposition. The structure of TRGO was analysed using X-ray ...
  • Recovering the two-body potential from a given three-body wave function 
    Belyaev, Vladimir Borisovich; Rakityansky, Sergei Anatoljevich; Gopane, Ishmael Mmusi (Springer, 2023)
    A simple way of deducing the two-body potential from a given two- or three-body wave function is suggested. This method makes it possible to numerically obtain an unknown potential acting between the particles A and B when ...
  • Tuning the surface properties of CuO films using the precursor aging approach for enhanced photoelectrocatalytic reactions 
    Kyesman, Pannan I.; Nombona, Nolwazi; Diale, M. (Mmantsae Moche) (Wiley Open Access, 2023-10)
    The surface properties of semiconductors have a significant influence on their photoelectrocatalytic efficiency. This research presents a precursor aging method for tuning the surface properties of CuO films, for enhanced ...
  • The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers 
    Talibawo, Joan; Nyarige, Justine Sageka; Kyesmen, Pannan Isa; Cyulinyana, Marie C.; Diale, M. (Mmantsae Moche) (IOP Publishing, 2022-02)
    Please read abstract in the article.
  • Asymmetric supercapacitor based on novel coal fly ash derived metal–organic frameworks as positive electrode and its derived carbon as negative electrode 
    Rambau, Khavharendwe Melba Amukelani; Tarimo, Delvina Japhet; Fasakin, Oladepo; Musyoka, Nicholas Mulei; Manyala, Ncholu I. (Springer, 2022-05)
    Please read abstract in the article.