Now showing items 583-602 of 2240

    • Marine Algae As Bioindicators Of Pollution Levels In The Arabian Gulf 

      Kureishy, Tariq W.; Abdel-Moati, M. A. R.; Al-Muftah, A. R. ( Qatar University , 1995 , Article)
      The extensive distribution of several marine macroalgal species makes them a potential bioindicator tool for monitoring existing levels of different types of marine pollutants in the region. The present work illustrates ...
    • The marine Mollusca of the Qatari waters, Arabian Gulf 

      Al Khayat. J. L. [جاسم عبد الله الخياط] ( Qatar University , 1997 , Article)
      The species composition of the mollusca community in the Qatari waters of the Arabian Gulf, is reported. Data were obtained from analysis of samples collected during 1996 - 1997. A total of 246 species were recorded, ...
    • A Markov Chain Model For River Flow 

      Salim, A. J. [عبد الغفور جاسم سالم]; Thanoon, B. Y. ( Qatar University , 1996 , Article)
      This paper is concerned with a trinary transformation of river flow. The transformed flow is modeled as a three-states Markov chain and both upcrossing and downcrossing problems are studied simultaneously. The stationary ...
    • Material Behaviour Under Corrosive Environment — Guide For Material Selection 

      Kandeil, A. Y.; Shawki, G. S. A. ( Qatar University , 1988 , Article)
      In this paper, the behaviour of engineering materials as influenced by fluid velocity, operating temperature, humidity and duration of exposure to chemical and/or electro-chemical action is carefully studied, corrosive ...
    • A Mathematical Model Of The Dynamics Of Schistosomiasis 

      Badran, Yehia [يحيى بدران]; Sherief, Hany ( Qatar University , 1996 , Article)
      In this work the authors develop a mathematical model for the dynamics of a major helminth parasite of man, schistosomiasis. The model is a system of coupled non-linear equations. Numerical experimentations with the model ...
    • Mathematical Model To Simulate The Surface Runoff For Ubaiyidh Valley In The Western Desert 

      Al-Dabbagh, Abdulsattar R. ( Qatar University , 1998 , Article)
      Water plays an important role in human life and development. The evaluation, planning and management of water resources become important in sustaining human life, specially in arid and semi arid regions. This paper aims ...
    • Measurement Of Thermal Conductivity Of Thermally Low-Conducting Materials 

      Selmi, M. ( Qatar University , 1995 , Article)
      The thermal conductivity of a building material is a necessary parameter in estimating the cooling load of a building. Cooling load estimates are quite important in selecting building materials especially in hot-climate ...
    • 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 ...
    • Mechanism of Dehydration of Ethanol over Alumina 

      Ebeid, Fikry M. [فكري عبيد] ( Qatar University , 1981 , Article)
      The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ...
    • Mechanism Of The Inhibition Afforded By Some Hydrazone Oxime Derivatives Towards Aluminium In 2m Naoh Solution 

      Fouda, A. S. [عبد العزيز السيد فوده]; Elbaz, A. M.; Moussa, M. N. ( Qatar University , 1991 , Article)
      The effect of some hydrazone oxime derivatives on the corrosion of aluminium in 2M NaOH solution was studied by polarization and weight-loss techniques. Polarization data indicated that all inhibitors tested were of a mixed ...
    • Meiofaunal Life of Man-Made Wastewater Ponds in Qatar 

      Elhag, E.A. [الحاج ابو جبر الحاج]; Kardousha, M.M.; Al-Thani, R.F.; Abdulfatih, H.A.; Al-Naimi, I.S.; ... more authors ( Qatar University , 2002 , Article)
      The meiofaunal life of two wastewater ponds around Doha City was studied for the period October 2000-October 2001. The substrate nature of the two ponds was found to be similar in mean particle sizes but the densities of ...
    • The Merchant of Venice in Arabic 

      Shetywi, Mahmoud ( Qatar University , 1995 , Article)
      This paper intends to investigate the varied treatment of The Merchant of Venice in Arabic, commenting particularly on the depiction of Shylock in Arabic drama. As such, the study will bring into focus two important aspects ...
    • Mercury Pollution In Abu Kir Bay East Of Alexandria, Egypt 

      Aboul Dahab, O.; أبو الذهب, أسامة ( Qatar University , 1992 , Article)
      Abu Kir Bay, east of Alexandria, is subjected to substantial pollution from two direct point sources which are Tabia Pumping Station (TPS) and Lake Edku Outlet (LEO). Mercury was speciated into dissolved reactive, dissolved ...
    • Mesozoic Igneous Activity In Egypt 

      Meneisy, M. Y. [محمد يسري منيسي] ( Qatar University , 1986 , Article)
      A geochronological sequence of the main phases of igneous activity in Egypt during the Mesozoic is presented in this paper. This is essentially based on scrutinized isotopic age data. New K / Ar ages are also included. Three ...
    • Metabolic Effects Of Cyproterone Acetate And Corticosterone In The Chicken Callus Domesticus 

      Saleh, F. [فؤاد صالح]; Ezzat, A. R. ( Qatar University , 1990 , Article)
      The metabolic effects of corticosterone were compared with those of cyproterone acetate , a steroidogenic inhibitor with suggested corticoid-like effects. Corticosterone significantly increased serum levels of ...
    • Metalinguistic Knowledge And Formal Functional Proficiency In English: The Case Of Basic Education Stage Learning In Jordan 

      Abdul Fattah, Hussein S.; محمد, حسين عبد الفتاح ( Qatar University , 1998 , Article)
      The present study aimed at assessing Jordanian 10th graders' metalinguistic knowledge of 15 English grammatical concepts or categories via rule description and exemplification as well as the link between the achieved ...
    • 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), ...
    • Microbial utilization of some agricultural And agro-industrial waste products for the Production of single cell protein (scp). 

      Abo Hamed, N. A. A.; أبو حامد, نبيل أبو القاسم ( Qatar University , 1993 , Article)
      The dried residues of com crop (com straw) were hydrolysed by 0.5 NH2SO4. Saccharomyces cerevisiae has been allowed to grow on media containing different concentrations of the com straw hydrolysate (CSH). The optimal ...
    • Microcomputer Aided Selection Of Robot Manipulators 

      Abdel Rahman, T. M ( Qatar University , 1991 , Article)
      This paper presents two programs for microcomputer aided assessment of the performance of robot manipulators. The first program automatically generates robot models based on user-supplied kinematic parameters. The program ...
    • Microdetermination Of Some Organic Nitriles Using The Cyanide Ion Selective Electrode 

      Hassan, S. S. M. [سعد السيد محمد حسن] ( Qatar University , 1985 , Article)
      The response characteristics of the solid state cyanide ion selective electrode toward some organic nitriles are investigated. In 10 M KOH solution, the electrode exhibits near Nemstian response over the range of 10~2 to ...