Recent Submissions

  • Kappa-Distributed Electrons in Solar Outflows: Beam-Plasma Instabilities and Radio Emissions 

    Lazar, M.; López, R. A.; Poedts, S.; Shaaban, S. M. ( Springer Science and Business Media B.V. , 2023 , Article)
    Electrostatic (ES) wave instabilities are assumed to be at the origin of radio emissions from interplanetary shocks, and solar coronal sources are most likely induced by electron beams, more energetic but less dense than ...
  • Instability of Langmuir-beam waves: Kappa-distributed electrons 

    Lazar, M.; López, R. A.; Poedts, S.; Shaaban, S. M. ( American Institute of Physics Inc. , 2023 , Article)
    In space plasmas, electron populations exhibit non-equilibrium velocity distributions with high-energy tails that are reproduced by the Kappa power-laws and contrast with the Maxwellian distributions often used in theoretical ...
  • An exploratory study on medications in Qatar homes 

    Kheir, N.; El Hajj, M.S.; Wilbur, K.; Kaissi, R.M.L.; Yousif, A. ( Dove Medical Press Ltd , 2011 , Article)
    Background: Drug therapy is the most often used intervention for treatment and prevention of disease. However, if used inappropriately, drugs can cause more harm than good. Improper drug storage and disposal can have a ...
  • Ion beam modification of surface properties of polyethylene 

    Andrzej, Turos; Jagielski, Jacek; Piątkowska, Anna; Bieliński, Dariusz; Ślusarski, Ludomir; ... more authors ( Elsevier , 2003 , Conference Paper)
    Improvement of polymer tribological properties is an essential issue for their application when used as parts of machines or artificial human joints. Ion implantation is a very promising technique in this respect. This ...
  • Mechanical and thermal properties of gamma-ray irradiated polyethylene blends 

    Mariam, Al-Ali; Madi, N.K; Al Thani, Nora J.; El-Muraikhi, M.; Turos, A. ( Elsevier , 2003 , Conference Paper)
    In this work, the results obtained by gamma-ray irradiation of polyethylene (PE) blends are presented. The blends were produced by injection molding at 220°C with different compositional ratios, i.e. 100/0, 15/85, 25/75, ...
  • Compositional transformations in ion implanted polymers 

    A.M., Abdul-Kader; Turos, A.; Grambole, D.; Jagielski, J.; Piątkowska, A.; ... more authors ( Elsevier , 2005 , Conference Paper)
    Changes of surface layer composition produced by ion bombardment of polyethylene and polypropylene samples were studied. These materials are under consideration for load bearing surfaces in biological and technical ...
  • Study on ferroelastic characteristics of gamma irradiated lithium potassium sulfate crystal 

    N.K, Madi; Kassem, M.E; El-Muraikhi, M; El-Khatib, A.M ( Elsevier , 1999 , Article)
    A detailed study of the optical absorption vs. γ-irradiation dose for lithium potassium sulfate crystal, LiKSO4 cut out perpendicular to x, y and z directions is presented. The optical density was measured within the ...
  • Temperature and electric field effects on the dielectric dispersion of modified polyvinyl chloride 

    M.E., Bassiouni; Al-Shamy, F.; Madi, N.K.; Kassem, M.E. ( Elsevier , 2003 , Article)
    The effect of electric field on the dielectric dispersion of modified polyvinyl chloride (PVC) has been investigated. The applied direct current (DC) field strength was ranging from 0 to 104 V cm−1. The complex permitivity ...
  • Surface layer modification of ion bombarded HDPE 

    D., Bielinski; Lipinski, P.; Slusarski, L.; Grams, J.; Paryjczak, T.; ... more authors ( Elsevier , 2004 , Article)
    Press-moulded, high density polyethylene (HDPE) samples were subjected to ion bombardment and effects of the modification studied. He+ ions of energy 100 keV or Ar+ ions of energy 130 keV were applied in the range of dose ...
  • The effects of ion bombardment of ultra-high molecular weight polyethylene 

    A., Turos; Abdul-Kader, A.M.; Grambole, D.; Jagielski, J.; Piątkowska, A.; ... more authors ( Elsevier , 2006 , Article)
    Ion bombardment is a suitable tool to improve tribological properties of polymers. In this study UHMWPE samples were bombarded with 130keV He ions to the fluences ranging from 1×1014 to 2×1016cm−2. RBS and NRA techniques ...
  • Effectiveness of two and three doses of COVID-19 mRNA vaccines against infection, symptoms, and severity in the pre-omicron era: A time-dependent gradient 

    Layan, Sukik; Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; ... more authors ( Elsevier , 2024 , Article)
    BackgroundVaccines were developed and deployed to combat severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. This study aimed to characterize patterns in the protection provided by the BNT162b2 and ...
  • Addressing bias in the definition of SARS-CoV-2 reinfection: implications for underestimation 

    Chemaitelly, Hiam; Ayoub, Houssein H.; Tang, Patrick; Yassine, Hadi M.; Al Thani, Asmaa A.; ... more authors ( Frontiers Media , 2024 , Article)
    Introduction: Reinfections are increasingly becoming a feature in the epidemiology of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. However, accurately defining reinfection poses methodological ...
  • Prevalence of hepatitis B and C viruses among migrant workers in Qatar. 

    Nasrallah, Gheyath K; Chemaitelly, Hiam; Ismail, Ahmed I A; Nizamuddin, Parveen B; Al-Sadeq, Duaa W; ... more authors ( Springer Nature , 2024 , Article)
    Limited data exist on viral hepatitis among migrant populations. This study investigated the prevalence of current hepatitis B virus (HBV) infection and lifetime hepatitis C virus (HCV) infection among Qatar's migrant craft ...
  • The effect of graphene on the activation energy of grain growth for the nanocrystalline thermoelectric n-type Bi2Te2.7Se0.3 

    El-Makaty, Farah M.; Pothuvattil, Nandagopal S.; Hamouda, Abdelmagid; Youssef, Khaled M. ( Springer Nature , 2022 , Article)
    Even though bismuth telluride is frequently produced by mechanical alloying for thermoelectric materials, no data has been published addressing the thermal behavior and activation energy of the milled n-type Bi2Te2.7Se0.3 ...
  • Synchronization and chimeras in a network of photosensitive FitzHugh-Nagumo neurons 

    Hussain, Iqtadar; Jafari, Sajad; Ghosh, Dibakar; Perc, Matjaž ( Springer Science and Business Media B.V. , 2021 , Article)
    Recently, a photosensitive model has been proposed that takes into account nonlinear encoding and responses of photosensitive neurons that are subject to optical signals. In the model, a photocell term has been added to ...
  • Proposing a Nondestructive and Intelligent System for Simultaneous Determining Flow Regime and Void Fraction Percentage of Gas-Liquid Two Phase Flows Using Polychromatic X-Ray Transmission Spectra 

    Amiri, Saba; Ali, Peshawa Jammal Muhammad; Mohammed, Shivan; Hanus, Robert; Abdulkareem, Lokman; ... more authors ( Springer , 2021 , Article)
    Two phase flows are of particular importance in various research fields. In the current article, a novel system consists of an X-ray tube and one sodium iodide crystal detector with ability of determining type of flow ...
  • A image encryption algorithm based on chaotic Lorenz system and novel primitive polynomial S-boxes 

    Al-Maadeed, Temadher Alassiry; Hussain, Iqtadar; Anees, Amir; Mustafa, Muhammad Tahir ( Springer , 2021 , Article)
    We have proposed a robust, secure and efficient image encryption algorithm based on chaotic maps and algebraic structure. Nowadays, the chaotic cryptosystems gained more attention due to their efficiency, the assurance of ...
  • Cryptanalysis of nonlinear confusion component based encryption algorithm 

    Munir, Noor; Khan, Majid; Shah, Tariq; Alanazi, Ammar S.; Hussain, Iqtadar ( Elsevier , 2021 , Article)
    Recently many substitution box based encryption algorithms ensuring privacy have been proposed. Many, chaotic map based S-boxes have been generated posing high nonlinearity and strong cryptographic properties. Encryption ...
  • Application of artificial intelligence and gamma attenuation techniques for predicting gas-oil-water volume fraction in annular regime of three-phase flow independent of oil pipeline's scale layer 

    Alkabaa, Abdulaziz S.; Nazemi, Ehsan; Taylan, Osman; Kalmoun, El Mostafa ( MDPI AG , 2021 , Article)
    To the best knowledge of the authors, in former studies in the field of measuring volume fraction of gas, oil, and water components in a three-phase flow using gamma radiation technique, the existence of a scale layer has ...
  • Computational study of metal doped graphene nanoribbon as a potential platform for detection of H2S 

    Salih, Ehab; Ayesh, Ahmad I. ( Elsevier Ltd , 2021 , Article)
    Theoretical investigation for detection of hydrogen sulfide (H2S) gas using hydrogen/nitrogen-terminated armchair graphene nanoribbon (HAGNR and NAGNR) doped with Pt is presented in this study. The investigation was ...

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