Browsing by Author "Al-Qaradawi, I. Y."

Now showing items 1-14 of 14

    • 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 ...

    • Corrosion properties of duplex treated Ti-6Al-4V alloy in chloride media using electrochemical and positron annihilation spectroscopy techniques 

      Khaled, M. M.; Yilbas, B. S.; Al-Qaradawi, I. Y.; Coleman, P. G.; Abdulmalik, D.; ... more authors ( Elsevier B.V. , 2006 , Article)
      The corrosion properties of duplex-treated and nitrided Ti-6Al-4V have been investigated in 0.025, 0.25 and 2.5 M NaCl using electrochemical techniques, Positron Annihilation Spectroscopy (PAS), X-ray diffraction (XRD), ...

    • The effect of gamma irradiation and shelf aging in air on the oxidation of ultra-high molecular weight polyethylene 

      Al-Ma'Adeed, M. A.; Al-Qaradawi, I. Y.; Madi, N.; Al-Thani, N. J. ( Elsevier , 2006 , Article)
      This study has investigated the effect of shelf aging, for up to one year in air, on the properties of gamma-irradiated ultra-high molecular weight polyethylene (UHMWPE). A variety of techniques were used to characterize ...

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

      Al-Qaradawi, I. Y. ( Elsevier Ltd , 2003 , Conference Paper)
      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 ...

    • 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 ...

    • 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 ...

    • Microstructure of heat-treated steel probed by positron annihilation 

      Al-Qaradawi, I. Y.; Abdel-Hady, E. E.; Megahed, H. (2001 , Conference Paper)
      Positron annihilation lifetime technique has been applied to study the microstructure change in steel after heat treatment. For this purpose, the specimens are heat treated in various manners; normalizing, annealing, ...

    • Positron annihilation and ion beam analysis of ion-bombardment-induced hydrogen release and oxidation of ultra high molecular weight polyethylene 

      Al-Qaradawi, I. Y.; Madi, N. K.; Turos, A.; Abdul-Kader, A. M. ( Elsevier , 2007 , Article)
      Ultra high molecular weight polyethylene was bombarded with He+ and Ar+ ions to fluences ranging from 1013 to 2×1016 ions/cm2. Rutherford backscattering and nuclear reaction analysis were applied to study mechanism of ...

    • Positron annihilation lifetime study of helium ions implanted polyethylene blends 

      Al-Qaradawi, I. Y.; Madi, N. K. ( Trans Tech Publications Ltd , 2004 , Conference Paper)
      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 ...

    • Positron annihilation lifetime study of pure and treated polyvinyl chloride 

      Al-Qaradawi, I. Y.; Abdel-Hady, E. E. ( scientific.net , 1997 , Article)
      Positron annihilation lifetime technique (PAL) has been applied to investigate the behavior of the free volume in pure and doped polyvinyl chloride (PVC) as a function of Pb concentration and temperature. It is noticed ...

    • Positron annihilation studies of the effect of gamma irradiation dose in polymers 

      Al-Qaradawi, I. Y.; Britton, D. T.; Abdel-Hady, E. E.; Abdulmalik, D. A.; Al-Shobaki, M. A.; ... more authors ( Elsevier Ltd , 2003 , Conference Paper)
      Positron annihilation lifetime (PAL) technique has been applied to study the effect of gamma irradiation dose on the structure of low-density polyethylene and polystyrene. The positron annihilation lifetime measurements ...

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

      Al-Qaradawi, I. Y.; Coleman, P. G. ( Elsevier , 2002 , Conference Paper)
      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 ...

    • Self-implantation of Cz-Si: Clustering and annealing of defects 

      Abdulmalik, D. A.; Coleman, P. G.; Al-Qaradawi, I. Y. ( Elsevier , 2006 , Article)
      Observations of vacancy clusters formed in Czochralski (Cz) Si after high energy ion implantation are reported. Vacancy clusters were created by 2 MeV Si ion implantation of 1 × 10 15 ions/cm 2 and after annealing between ...

    • Tests of a diamond field-assisted positron moderator 

      Al-Qaradawi, I. Y.; Sellin, P. A.; Coleman, P. G. ( Elsevier , 2002 , Conference Paper)
      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 ...