Now showing items 167-186 of 221

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 - ...
    • Repetitive Control Based Pwm Inverter Dead-Time Compensation For Ac Servo Drive 

      Ben-Brahim, L. ( Qatar University , 2002 , Article)
      AC servomotor speed or current controller based on PI control and/or optimal control, can not eliminate the cyclical fluctuations of speed or current when subject to periodic disturbances. However, repetitive control ...
    • A Review of Fatigue Testing Machines 

      Shawki, G. S. A. ( Qatar University , 1990 , Article)
      In this paper fatigue testing facilities are first classified in accordance with a number of features which include purpose, type of loading, method of load application and transmittal as well as control system. Owing to ...
    • A Review Of Petroleum Engineering Aspects Of Qatar's Oil And Gas 

      Al Siddiqi, Ahmed; Dawe, Richard ( Qatar University , 1998 , Article)
      This paper reviews, from a petroleum engineering point of view, the 60 years of discovery and development of tlie oil and gas resources within the boundaries of the State of Qatar. Up to 1990 there were four major hydrocarbon ...
    • Secondary vs. Tertiary oil recovery from a two-dimensional porous media by microemulsion flooding 

      Sayyouh, M. H. ( Qatar University , 1989 , Article)
      The objective of this research was to study the application of microemulsion flooding in a visual, two-dimensional sandpack for the purpose of investigating the efficiency of oil displacement during secondary and tertiary ...
    • Selection Of Optimized Fuzzy Rules For Process Control Systems: Using Genetic Algorithms 

      Katebi, S. D. ( Qatar University , 1996 , Article)
      In this paper modeling, selection and optimization of fuzzy rules for multivariable feedback process control and decision making systems are developed and discussed. A general model for multivariable fuzzy rules is derived ...
    • A Self-Organizing Multisensor Fusion Classification Algorithm 

      Mamlook, Rustom ( Qatar University , 1996 , Article)
      A self-organizing multisensor fusion algorithm to classify the inputs (data or images) into classes (targets, backgrounds) is presented. The algorithm forms clusters and is trained without supervision. The clustering is ...
    • Shear Behavior Of Reinforced High-Strength Concrete Beams Without Shear Reinforcement 

      Wafa, Faisal F. ( Qatar University , 1994 , Article)
      Eighteen rectangular singly reinforced high-strength concrete beams without web reinforcement were tested in combined shear and flexure. The main variables were the longitudinal steel reinforcement ratio and the shear-span ...
    • Signal Identification Using A Microprocessor Based Phase Locked Loop System 

      Metwally, M. S. ( Qatar University , 1989 , Article)
      A scheme for waveform comparison and the measurement of periodic signal parameters through processing, controlling and measuring programs is realised. A microcomputer is used with a phase locked loop voltage controlled ...
    • The Significance Of Permeability And Wettability Contrasts On Near Wellbore Flow Patterns Creating Formation Damage Effects 

      Al Marhoon, Nadhal 0.; Grattoni, Carlos A.; Dawe, Richard A. ( Qatar University , 1999 , Article)
      The majority of hydrocarbon reservoirs are heterogeneous and any geological model that is unable to represent these heterogeneities will not capture the correct displacement physics. In particular, difficulties are encountered ...
    • Simplified Method For Plate Deflection Calculation 

      Al Ansari, Mohammed S. ( Qatar University , 1997 , Article)
      This paper presents a simplified method for the calculation of thin-plate deflections. The method, which deals with uniformly loaded plates, uses the stiffness method to obtain plate deflection equations for specified ...
    • Simulation of Cross-Current Extraction Processes 

      Salem, A. B. ( Qatar University , 1988 , Article)
      Extraction processes dealing with partially miscible solvents are usually calculated by graphical methods to estimate the number of stages required, flow rates and compositions of the streams. Such procedures may be lengthy. ...
    • Simulation Of Three-Phase Distillation Column Using Bubble Point And Φ-Φ Approach 

      Lashkari, Siamak; Moshfeghian, Mahmood ( Qatar University , 1995 , Article)
      Most of organic compounds are partially miscible in water and due to their solubility criteria split into two liquid phases. So design of equipments that separate two liquid phase systems differ from one liquid phase system ...
    • Software For On-Line Monitoring Of E10-B Telephone Exchange 

      El Hadidi, M. T.; El-Soudani, Magdi S.; Al-Harami, Ibrahim M. ( Qatar University , 1991 , Article)
      The proposed software aims at enhancing the monitoring of the E10-B telephone exchange. It combines functions normally performed by two dedicated hardware devices and facilitates access to detailed maintenance information ...