Obaid, Ruwaida S., Department of physics, College of Science, University of Baghdad, Baghdad, Iraq Obasi, Rita C., Centre for Satellite Technology Development-NASRDA, Abuja, Nigeria Obasi, Rita C., Centre for Satellite Technology Development-NASRDA, Abuja, Nigeria Obisung, Effiong, Department of Physics, University of Calabar, Calabar, Nigeria Obisung, Effiong, Department of Physics, University of Calabar, PMB 1115, Calabar, Nigeria Obisung, Effiong O., Department of Physics, University of Calabar, P.M.B 1115, Calabar, Nigeria Obu, Joseph A., Theoretical Physics Group, Department of Physics, University of Calabar, Calabar, Nigeria Oduncuoglu, Murat, Department of Physics, Yıldız Technical University, Istanbul, Turkey Odzhaev, Vladimir B., Belarusian State University, Minsk, Republic of Belarus Ogherohwo, E.P., Federal University of Petroleum Resources, Effurun, Delta State, Nigeria Ogurtsova, Tetiana M., O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine Ohon, Natalia, Lviv Polytechnic National University, Department of Electronic Engineering, Lviv, Ukraine Okon, Ituen, Theoretical Physics Group, Department of Physics, University of Uyo, Nigeria Okoro, Osaretin E., Centre for Satellite Technology Development-NASRDA, Abuja, Nigeria Okseniuk, Ivan I., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Okseniuk, Ivan I., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Okseniuk, Ivan I., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Olefir, Volodymyr, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Olefir, Volodymyr, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine; National Science Center “Kharkiv Institute of Physics and Technology”, Kharkiv, Ukraine Olefir, Volodymyr P., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Oleinikov, Eugene V., Institute of Electron Physics, National Academy of Sciences of Ukraine, Uzhhorod, Ukraine Olimov, Abdurauf N., Institute of Ion-Plasma and Laser Technologies, Uzbekistan Academy of Sciences, Tashkent, Uzbekistan Ollamberganov, Sherzod Z., Karakalpak State University, Nukus, Uzbekistan Olopade, Muteeu A., Department of Physics, Fourah Bay College, University of Sierra Leone, Freetown, Sierra Leone; Department of Physics, Faculty of Science, University of Lagos, Akoka, Lagos, Nigeria Omelnik, O., National Science Center “Kharkiv Institute of Physics and Technology” of NAS of Ukraine, Kharkiv, Ukraine Omelnik, Oleksandr P., NSC “Kharkiv Institute of Physics & Technology” NASU,Kharkiv, Ukraine Omelnyk, Oleksandr, National Science Center «Kharkiv Institute of Physics and Technology», Kharkiv, Ukraine Omelnyk, Oleksandr P., National Science Center “Kharkiv Institute of Physics & Technology”, Kharkiv, Ukraine Omonov, Bunyodjon U., Fergana State University, Fergana, Uzbekistan Omugbe, E., Department of Physics, Federal University of Petroleum Resources, Effurun, Delta State, Nigeria Onarkulov, Karimberdi E., Fergana State University, Fergana, Uzbekistan Ongodo, Dieudonné, Laboratory of Atomic, Molecular and Nuclear Physics, Department of Physics, Faculty of Science University of Yaounde, Yaounde, Cameroon Onimisi, Muhammad Y., Department of Physics, Nigerian Defence Academy, Kaduna, Nigeria Onishchenko, I.N., National Science Center «Kharkiv Institute of Physics and Technology», Kharkiv, Ukraine Onishchenko, I.N., National Science Center «Kharkiv Institute of Physics and Technology», Kharkiv, Ukraine Onoh, Edwin U., Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria Onoja, Audu D., Department of Physics, Federal University of Agriculture Makurdi, Benue State, Nigeria Onyshchenko, G., O.I. Akhiezer Department for Nuclear Physics and High Energy Physics, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Onyshchenko, G., O.I. Akhiezer Department for Nuclear Physics and High Energy Physics, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Onyshchenko, Gennadiy, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine; Institute for Scintillation Materials, STC “Institute for Single Crystals”, National Academy of Sciences of Ukraine, Kharkiv, Ukraine; Institute for Scintillation Materials, STC “Institute for Single Crystals”, National Academy of Sciences of Ukraine, Kharkiv, Ukraine Onyshchenko, Gennadiy M., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine Onyshchenko, Gennadiy M., V.N. Karazin Kharkiv National University, Kharkiv, Ukraine; Institute of Scintillation Materials, STC "Institute of Single Crystals" National Academy of Sciences of Ukraine, Kharkiv, Ukraine Orlenko, Oleksandr A., O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine Orletskyi, Ivan, Department of Electronics and Energy Engineering, Chernivtsi National University, Chernivtsi, Ukraine Orujova, A.A., Mingachevir State University, Azerbaijan Ostash, Orest P., Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Lviv, Ukraine Otarbaev, A.E., Nukus State Pedagogical Institute Named After Ajiniyaz, Nukus, Uzbekistan Ovcharenko, Valeriy D., National Science Center Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine Oyedare, Peter, Department of Science Laboratory Technology, Federal Polytechnic Ede, Osun State, Nigeria Ozurumba, Anthony C., Africa Center of Excellence in Future Energies and Electrochemical Systems, Federal Univerity of Technology, Owerri, Imo State, Nigeria