College of Arts & Sciences: Recent submissions

Now showing items 781-800 of 3655

    • Positron annihilation lifetime study of helium ions implanted polyethylene blends 

      Al-Qaradawi, I. Y.; Madi, N. K. ( Trans Tech Publications Ltd , 2004 , Conference)
      The structural defects of linear low density polyethylene (LLDPE) and high density polyethylene (HOPE) blends implanted with helium ions were investigated using position annihilation lifetime (PAL) technique. The positron ...

    • Investigations of He <sup>+</sup> implantation and subsequent annealing effects in InP 

      Al-Qaradawi, I. Y. ( Elsevier , 2006 , Article)
      The influence of 70 keV He + ion implantation and subsequent annealing of Cz-indium phosphide (InP) samples has been investigated using a slow positron beam-based Doppler broadening spectrometer. Three samples with ion ...

    • Electron irradiated low-density polyethylene studied by positron annihilation lifetime spectroscopy 

      Al-Qaradawi, I. Y. ( Elsevier Ltd , 2003 , Conference)
      A study of the degree and rate of cross-linking of low-density polyethylene (LDPE) as a result of irradiation by high-energy electron beam has been performed using positron annihilation lifetime (PAL) technique. The PAL ...

    • Tests of a diamond field-assisted positron moderator 

      Al-Qaradawi, I. Y.; Sellin, P. A.; Coleman, P. G. ( Elsevier , 2002 , Conference)
      Diagnostic studies have been performed on a 70 μm thick diamond film with a view to its development as a possible field-assisted moderator (FAM) for slow positron emission. The film was coated on one side with a 200 nm ...

    • Re-emission of slow positrons from tungsten at elevated temperatures 

      Al-Qaradawi, I. Y.; Coleman, P. G. ( Elsevier , 2002 , Conference)
      A series of measurements have been made on the dependence of the intensity and energy spectrum of slow positrons re-emitted from polycrystalline tungsten foil held at temperatures of up to 500 °C. Irrespective of target ...

    • Treatment as prevention for hepatitis C virus in the Middle East and North Africa: a modeling study 

      Ayoub, Houssein H.; Mahmud, Sarwat; Chemaitelly, Hiam; Abu-Raddad, Laith J. ( Frontiers Media SA , 2023 , Article)
      Background: Direct-acting antivirals opened an opportunity for eliminating hepatitis C virus (HCV) infection in the Middle East and North Africa (MENA), the region most affected by HCV infection. Impact of HCV treatment ...

    • Combined experimental and computational investigations of the fluorosolvatochromism of chromeno[4,3-b]pyridine derivatives: Effect of the methoxy substitution 

      Shkoor, Mohanad; Thotathil, Vandana; Al-Zoubi, Raed M.; Su, Haw-Lih; Bani-Yaseen, Abdulilah Dawoud ( Elsevier , 2023 , Article)
      Extensive research has been conducted on the spectral properties of chromeno[4,3-b]pyridine derivatives, owing to their potential applications in sensing, optoelectronic devices, and drug discovery. This study presents a ...

    • Formation of a cold antihydrogen beam in AEGIS for gravity measurements 

      Testera, G.; Belov, A. S.; Bonomi, G.; Boscolo, I.; Brambilla, N.; ... more authors ( AIP Publishing , 2008 , Article)
      The formation of the antihydrogen beam in the AEGIS experiment through the use of inhomogeneous electric fields is discussed and simulation results including the geometry of the apparatus and realistic hypothesis about the ...

    • Measuring the fall of antihydrogen: The AEGIS experiment at CERN 

      Doser, M.; Allkofer, Y.; Amsler, C.; Belov, A. S.; Bonomi, G.; ... more authors ( Elsevier B.V. , 2011 , Conference)
      Considerable efforts have been made and are still being made to verify the validity of the principle of the equivalence of gravitational and inertial mass, one of the cornerstones of the classical theory of general relativity. ...

    • Antihydrogen physics: Gravitation and spectroscopy in AEgIS 

      Ferragut, R.; Belov, A. S.; Bonomi, G.; Boscolo, I.; Brusa, R. S.; ... more authors ( Canadian science publishing , 2011 , Article)
      AEgIS (Antimatter experiment: gravity, interferometry, spectroscopy) is an experiment approved by CERN with the goal of studying antihydrogen physics. In AEgIS, antihydrogen will be produced by charge exchange reactions ...

    • Aqueous electrolyte system for porous silicon using electrochemical anodization 

      Manoj, K. C.; Dubey, Mukul; Bills, Braden; Al-Qaradawi, Ilham Y.; Lamsal, Buddhi Sagar; ... more authors ( IEEE Xplore , 2013 , Conference)
      Electrochemical anodization on n-type silicon was performed with silicon as anode and platinum as cathode in a weak-acid aqueous electrolyte containing orthophosphoric acid and ammonium fluoride. Anodization was carried ...

    • Creating textured surfaces using plasma electrolysis 

      Zhang, Z.; Dubey, Mukul; Galipeau, David; Fan, Qi Hua; Hoefelmeyer, James D.; ... more authors ( Materials Research Society , 2013 , Article)
      Plasma electrolysis (PE) is a combination of electrolysis and plasma discharge. Previous studies indicated that PE usually created porous surface with irregular morphology as a result of the plasma-cathode interaction that ...

    • A new depositional model and sequence stratigraphic interpretation for the upper Jurassic Arab "D" reservoir in Qatar 

      Al-Saad, H.; Sadooni, F. N. ( Wiley online Library , 2001 , Article)
      Deposition of the Arab Formation on the Arabian Plate followed a eustatic sea-level high during the Oxfordian that deposited the open-marine shelfal carbonates of the Hanifa and Jubaila Formations. Oolite/peloidal shoals ...

    • Chronostratigraphy and geochemical characterization of volcanic rocks from the Hormuz Complex: Constraints from the Halul Island, The State of Qatar 

      Nasir, Sobhi; Al-Saad, Hamad; Sadooni, Fadhil ( sultan qaboos university , 2003 , Article)
      Geochemical and Sr-Nd isotopic data are reported for volcanic rocks in the Hormuz Complex, Halul Island, Eastern Qatar. Two groups of volcanic rocks are distinct in their geochemical characteristics. Group 1 samples have ...

    • Stratigraphy and sedimentology of the Hofuf Formation in the State of Qatar in relation to the tectonic evolution of the East Arabian Block 

      Alsaad, Hamad; Nasser, Sobhi; Sadooni, Fadhil; S. Alsharhan, Abdulrahman ( Sultan Qaboos University , 2002 , Article)
      Well-exposed, fine-grained to pebbly coarse-grained fluvial sandstones of Late Miocene to Pleistocene age crop out in the south-central and south-western parts of Qatar. These sandstones belong to the Hofuf Formation and ...

    • Halul and Sharao islands, offshore Qatar: Remnants of the great infracambrian Hormuz Salt basin 

      Sadooni, Fadhil N.; Al-Saad, Hamad; Nasir, Sobhi J. ( springer link , 2004 , Article)
      Halul and Sharao islands, offshore Qatar, are among more than 200 islands in the Gulf region, which are believed to have formed by salt diapirism sourced in the Infracambrian Hormuz Salt Series. The islands are composed ...

    • The cycle-complete graph Ramsey number r(C6,K8)≤38 

      Jaradat, M.M.M.; Alzaleq, B.M.N. ( Tokyo University of Science , 2008 , Article)
      The cycle-complete graph Ramsey number r ( C m , K n ) is the smallest integer N such that every graph G of order N contains a cycle C m on m vertices or has independent number α ( G ) ≥ n . ...

    • Research on sport and Islam: The way forward 

      Amara, Mahfoud; Testa, Alberto ( Taylor & Francis Group , 2015 , Book chapter)
      [No abstract available]

    • The ramsey number for theta graph versus a clique of order three and four 

      Bataineh, M.S.A.; Jaradat, M.M.M.; Bateeha, M.S. ( University of Zielona Gora , 2014 , Article)
      For any two graphs F1 and F2, the graph Ramsey number r(F1, F2) is the smallest positive integer N with the property that every graph on at least N vertices contains F1 or its complement contains F2 as a subgraph. In ...

    • Sport in Islam: The complexities, controversies and context 

      Testa, Alberto; Amara, Mahfoud ( Taylor & Francis Group , 2015 , Book chapter)
      no abstract