Now showing items 861-880 of 2240

    • Rainfall Characterization In An Arid Area 

      Bazaraa, A. S.; Ahmed, Shamim ( Qatar University , 1991 , Article)
      The objective of this work is to characterize the rainfall in Doha which lies in an arid region. The rainfall data included daily rainfall depth since 1962 and the hyetographs of the individual storms since 1976. The ...
    • A Random Binary Trees Generation Method 

      Maghrabi, Saud M.A. [سعود محمد عبد الله مغربي] ( Qatar University , 2000 , Article)
      There are two widely used random distributions on binary trees, namely the binary search tree distribution and the uniform distribution. By analyzing the performance of algorithms that manipulate binary trees generated at ...
    • Random Distributed Algorithms For Clock Synchronization 

      Nakai, Shoichiro ( Qatar University , 1992 , Article)
      This paper proposes clock synchronization algorithms based on the idea in which randomly chosen m out of the total N processors cooperate to perform the clock adjustment of all processors in a distributed system. Selection ...
    • A Rational Exponential Model for Unconstrained Non-Linear Optimization 

      Al Mashhadany, Huda Khalil [هدى خليل المشهداني] ( Qatar University , 2002 , Article)
      In this Paper, a new algorithm based on the non-quadratic model is suggested for solving unconstrained optimization problems which modifies the classical conjugate gradiant methods. This technique has the same properties ...
    • A rational logarithmic model for unconstrained non-linear optimization 

      Mohamed, H. K. [هدى محمد]; Al Assady, Nidhal H. ( Qatar University , 1997 , Article)
      A new non-quadratic model is proposed for solving unconstrained optimisation problems which modifies and develops the classical conjugate gradient methods. The technique has the same properties as the classical conjugate ...
    • Rayn formation, a new name for the permian khuff formation (S. S.) In saudi arabia 

      El Nakhal, Hamed A. [حامد احمد النخال] ( Qatar University , 1991 , Article)
      The rank of the Khuff Formation (late Carboniferous-late Permian) in Saudi Arabia is raised to group status and it is divided into Unayzah (late Carboniferous-early Permian) and Rayn (middle-late Permian) Formations. The ...
    • Recent Advances In Coring And Core Analysis Technology New Technique To Improve Reservoir Evaluation 

      Al Saddique, M.A; Hamada, G. M.; Al-Awad, M. N. ( Qatar University , 2000 , Article)
      The main goal of core analysis is to reduce uncertainty in reservoir evaluation by providing data representative of the reservoir at in situ conditions. Basic core analysis measurements are unchanged, but advances in core ...
    • Recent Benthic Foraminifera from the Local Water of Qatar, Arabian Gulf 

      Al Hitmi, Hind Hitmi [هند هتمي الهتمي] ( Qatar University , 2000 , Article)
      ABSTRACT In the present study, fifty species of Foraminifera are identified from the bottom sediments of the local Qatari waters on the eastern and northern sides of Qatar Peninsula in the Arabian Gulf. These comprise 7 ...
    • The reception of the Quiet American in the late fifties 

      Saleh, T. A. ( Qatar University , 1981 , Article)
    • Recognition Of Cursive Texts Using Hamming Neural Nets 

      Katebi, S. D. ( Qatar University , 1994 , Article)
      Hamming Neural networks are employed for cursive text character separation and recognition. The digitized image of the scanned text is first enhanced by applying simple contrast stretching algorithm. Image registration is ...
    • Record of a fruiticose lichen, Ramalina farinacea (L.) Ach. for Qatar 

      Abdel Bari, Ekhlas M.M.; عبد الباري, اخلاص محمد ( Qatar University , 1997 , Article)
      Lichens are thallophytic lower plants. Ramalina farinacea (L.) Ach., family Ramalinaceae, is the only fruticose lichen recorded in Qatar. It occurs on stony terrain bordering the coastline in association with other more ...
    • Records of Marine Interstitial Hymenostomatid Ciliates from the Jubail Marine Wildlife Sanctuary, Saudi Arabia 

      Al Rasheid, Khaled A. S. [خالد عبد الله سليمان الرشيد] ( Qatar University , 1999 , Article)
      Sediment samples were collected at low tide from various localities of Jubail Marine Wildlife Sanctuary in the Arabian Gulf during 1996-1997 for the study of the marine interstitial ciliate fauna of the Sanctuary. Eleven ...
    • Red cell superoxide dismutase in patients with different liver diseases 

      Abd El Aziz , A. F.; Attallah, A. M.; عبد العزيز, عبد العزيز فتوح; عطا الله, عبد الفتاح محمد ( Qatar University , 1995 , Article)
      Supcroxidc dismutase (SODs, supcroxidc oxidoreductasc, E.C. 1.15.1.1.) activity has been estimated in red blood cells from patients suffering from liver cirrhosis and hcpatoccllular carcinoma. Erythrocytcs supcroxide ...
    • Reduced Snubber Circuit Elements For Pwm Voltage Source Inverter 

      Saied, Basil M.; Ameen, Yasir M. Y. ( Qatar University , 2002 , Article)
      This paper presents the description and simulation of a new proposed arrangement of RLD/RCD snubber circuit used with pulse width modulated voltage source inverter. The new arrangement allows minimizing the number of active ...
    • Refractivity Statistics For Two Countries In The Middle East 

      Kheirallah, H. N. ( Qatar University , 1989 , Article)
      This paper presents and compares the results of refractive index studies for Mersa Matrouh, Egypt, and Doha, Qatar. Statistics for surface refractivity and refractivity gradients at different heights from the surface are ...
    • Refrigerants Beyond 1995 - An Overview 

      Kamal, W. A. ( Qatar University , 1994 , Article)
      The count down has started. Less than 400 days, that is all the time left till the complete phase-out of CFC production. No more refrigerants R-l 1, R-12 or R-500 will be produced worldwide. With our extreme dependence - ...
    • Regeneration from different levels along the tail of the geckonid lizard, Bunopus tuberculatus 

      Abdel Karim, Ahmed E.; عبد الكريم, أحمد السيد ( Qatar University , 1994 , Article)
      Study of the influence or amputation level on regenerate length, elongation rate and mitotic index of the tail of the geckonid lizard, Bunopus tuberculatus revealed that the tails amputated such that three-fourth, or ...
    • Regeneration of the vagus nerve after highly selective vagotomy, an autoradiographic study in the ferret stomach . 

      Al Muhtaseb, M. H. [محمد هاشم المحتسب]; Abu-Khalaf, M. ( Qatar University , 1995 , Article)
      This study investigates the regeneration of the vagal nerve fibres after highly selective vagotomy in the ferret stomach by using the autoradiographic technique. Autoradiographic examination of the body of the stomach in ...
    • Regeneration of Transformed Forage Legume Plants by Agrobacterium rhizogenes R1601 

      Al Barhawi, Najwa I. [نجوى البرهاوى]; Atheel, N. Y. ( Qatar University , 2003 , Article)
      Transformed forage legume plants (alfalfa & clover) by genetic engineering bacteria Agrobacterium rhizogenes R1601,were regenerated directly from seedling plants after inoculating the wounded site formed by cutting the ...
    • Regenerative abnormalities in hind limbs of bufo regularis induced by repeated amputations: I. Early larval stages 

      Abdel Karim, Ahmed E.; Michael, Milad I.; عبد الكريم, أحمد السيد; ميخائيل, ميلاد اسحق ( Qatar University , 1993 , Article)
      The regenerative response of the hind limbs of early larval stages: 52, 53, 54 and 55 of Bufo regularis was studied following repeated amputations at the ankle level. The pattern of morphogenesis as well as skeletal ...