Qatar University Science Journal - [From 1981 TO 2007]: المرسلات الحديثة

السجلات المعروضة 161 -- 180 من 770

    • Investigation Of Single-Update Memoryless Cg-Methods 

      Al Bayati, A. Y. [عباس البياتي]; Ahmed, Huda Issam ( Qatar University , 1996 , Article)
      Two new CG-methods are proposed in this work for nonlinear unconstrained optimization problems which are considered as memoryless Variable Metric (VM) methods. They are derived for the inexact line searches and evaluated ...

    • Constituents Of Centaurea Species 

      Al Easa, H. S. [هالة سلطان العيسى]; Rizk, A. M. ( Qatar University , 1992 , Article)
      A comprehensive review of Centaurea species including all the isolated consituents is given. The biological activities of the studied species are also reported.

    • Methylated Flavonoids From Artemisia Monosperma 

      Ismail, S. I. [شمس الدين امبابي اسماعيل]; Hammouda, F. M.; Rizk, A. M.; Hassan, N. M. ( Qatar University , 1989 , Article)
      Investigation of the flavonoid constituents of Artemisia monosperma resulted in the isolation and identification of four methylated flavonoids: quercetin 3,3',4'-trimethylether, diosmetin (luteolin 4'-methylether), ...

    • Indecomposable Representations Of Order Of E6 

      Omar, A. A. H [عبد الرؤوف عمر]; Sidky, F. I. ( Qatar University , 1985 , Article)
      The extended Dynkin diagram is a valued graph. We are going to construct a Baechstrom order A associateed to Eg. We prove, by constructions, that the order A of infinite lattice-type but can be listed (tame-type), i.e., ...

    • Lineament Analysis Of Qatar Peninsula Based On Landsat Imagery 

      El Kassas, I. A. [ابراهيم علي القصاص]; Ashour, M. M. ( Qatar University , 1990 , Article)
      Photo-interpretation of Landsat MSS images of Qatar Peninsula reveals several surface lineaments of different types, extentions and trends. Some of these photo-lineaments are of structural nature while others represent ...

    • Study Of Aerobiology Of Alexandria, Egypt 

      El Ghazaly, G. [جمال عبد المجيد الغزالي]; Yusef, Hasan; Ahmed, Manal; El-Ghazaly, Polixeni Kotzamanidou ( Qatar University , 1991 , Article)
      The present study provides a survey of atmospheric pollen and fungal spores in the city of Alexandria with the aim of supplying information that may be useful in the treatment of aeroallergies. Considerable attention has ...

    • Characterization of Polymers in Dilute Solutions 

      Tuzar, Zdenek [زدينك توزار] ( Qatar University , 1997 , Article)
      Basic moleculer characterisitics of polymers are: molecular architecture, molecular weight and size, and their distributions. All these characterisitics are derived from measurements of very dilute solutions. Methods of ...

    • An early marker of monoclonal light chain protein In bladder cancer 

      Ibrahim, A. M. [ا م ابراهيم]; Khalil, A. M.; Shaheen, F. A.; Hussein, M. M.; El-Shawarby, N. K. ( Qatar University , 1994 , Article)
      Bladder cancer complicating schistosomiasis is a major cause of cancer mortality in Egypt. It affects farmers who suffer from repeated and severe chronic schistosomal cystitis. The late presentation of this disease is ...

    • Effect of plastic deformation on Corrosion of cadmium in 0.1 m sodium Sulphate solution 

      Kandeil, A. Y. [عبد الرزاق يوسف قنديل]; El-Gaber, A. S.; Mourad, M. Y. ( Qatar University , 1993 , Article)
      The present investigation was carried out to study the influence of prior plastic deformation and surface finish on the corrosion behaviour of pure cadmium in 0.1 M Na2SC>4 solution at 25° C. Cylindrical specimens were ...

    • Measurements Of Radon Permeability Through Some Membranes 

      Arafa, W. [وفاء محمود عرفه] ( Qatar University , 1994 , Article)
      The diffusion of 222Rn through different types of membranes has been studied by an equilibrium method using a Si surface barrier a-detector with a resolution of 14 keV FWHM for ^'Am. The permeability constant for Aluminized ...

    • Mineralogy, petrography and manufacturing of good quality Blackboard chalk 

      Nasir, Sobhi J. [صبحي جابر نصر] ( Qatar University , 1996 , Article)
      Most of the Arabian countries produce bad quality and dusty blackboard chalk. Good quality and dustless blackboard chalk are usually imported from Europe, China, Taiwan and the United States of America. The essential raw ...

    • Studies on some aspects of antiviral activity. 1-influence of propolis on Newcastle disease virus 

      Hegazi, A. G. [احمد حجازي]; El Berdiny, F.; El Assily, S.; Khashabah, E.; Hassan, N.; ... more authors ( Qatar University , 1994 , Article)
      The effect of popolis on different-Newcastle disease virus (NDV) vaccinal strains as well as virulent virus were studied. It was clear that the addition of propolis to NDV induced a significant reduction of infectivity ...

    • The Inhibitive Action Of Sodium Soya Sulphonate Towards The Corrosion Of Aluminium In Hydrochloric Acid 

      Mourad, M. Y.; Mead, A. I.; Seliman, S. A. ( Qatar University , 1993 , Article)
      The dissolution of aluminium in 2M hydrochloric acid in the presence of sodium soya sulphonate (SSS) as corrosion inhibitor has been studied using hydrogen evolution and thermometric methods. The two methods gave consistent ...

    • Empirical Investigation Of Wave Velocities In Bahariya Formation, Western Desert, Egypt 

      Othman, Adel A. A. [عادل علي علي عثمان] ( Qatar University , 1994 , Article)
      In the Meleiha Oil Field, Western Desert of Egypt, eleven selected drilled wells were chosen to investigate the seismic velocities in the Bahariya Formation. The velocity-depth relations were studied and equated. The ...

    • Electrical Properties Of The Lower Eocene Rocks In Qatar 

      El Sayed, Abdel Moktader A. [عبد المقتدر عبد العزيز السيد] ( Qatar University , 1987 , Article)
      Thirteen limestone samples representing the Rus Formation (Lower Eocene) are selected' from four locations in Qatar Peninsula. These samples are subjected to electrical resistivity, porosity, shaliness factor and water ...

    • Photoperiod and salinity effects on survival and some blood parameters in female Bufo regularis 

      Hagras, Ahmed E. E. [احمد الوزير هجرس] ( Qatar University , 1986 , Article)
      This study, investigates the effect of different salinities injected (30, 70 and 100 % sea water) and photoperiods (L:D/8:16,L:D/12:12 and L: D / 16 : 8 ) on female Bufo regularis (1) survival rate, (2 ) oxygen and carbon ...

    • Vitamin - a and limb regeneration in stages of the egyptian toad, bufo regularis Reuss-histological study 

      Michael, M. I. [ميلاد اسحق ميخائيل]; El-Mekkawy, Desouki A.; Sayed-Ahmed, Abdulla A.; Mahmoud, Gamal A. ( Qatar University , 1995 , Article)
      The histogenesis of regenerated limbs, of both control and treated /larvae/ with 30 I.U./ml of retinol palmitate for 3 days, was studied in two larval stages (viz. stages 53 & 54) of the anuran amphibian, Bufo regularis ...

    • Geologic evolution of the Dukhan salt flats in Western Qatar Peninsula, Arabian Gulf 

      Sadiq, A. Ali. M. [عبد العلي محمد صادق] ( Qatar University , 2003 , Article)
      Photo-interpretation of landsat Thematic Mapper images of the Dukhan salt flats, on the west coast of Qatar, reveals several deposit zonations within the salt flats. The deposit zonations occupy a restricted sub-evaporite ...

    • Single Cell Protein Production From Beet Pulp By Mixed Culture 

      Ghanem, K. M. [خالد محمد غانم] ( Qatar University , 1992 , Article)
      A mixed culture of Trichoderma reeseiand Kluyveromyces marxianuswas found to be more efficient for single cell protein (SCP) production (51%) from beet pulp (BP) than the other tested mixed cultures containing T. reeseior ...

    • Microscopic Study Of The Rabbit Pancreas After Vagotomy 

      Al Muhtaseb, M. H. [محمد هاشم المحتسب]; Ali, Khalid A. ( Qatar University , 1997 , Article)
      The microscopic study of the morphological changes in the rabbit pancreas were investigated after vagotomy. Structural changes were observed in the pancreatic acinar cells and in the islets of langerhans two and three weeks ...