• 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 ...
    • Soil Classification Decision Support System Using An Expert System Approach 

      Al Rawas, Amer ( Qatar University , 1998 , Article)
      Soil classification systems are necessary for the identification of soil properties. Expert systems can be a very powerful tool in identifying soils quickly and accurately. In this paper, an interactive and user-friendly ...
    • A Solar Pond For Air Conditioning A Small Family House In Qatar 

      Kamal, W. A. ( Qatar University , 1992 , Article)
      The concept of using a solar pond to provide air conditioning for a typical small family Qatari house is developed. Though the idea seems appealing for a number of reasons, the design study shows it to he technically ...
    • Solar Water Pumping — An Analytical Overview 

      Kamal, W. A. ( Qatar University , 1988 , Article)
      Two basic thermodynamic conversion techniques of solar water pumping are recognized. In the first technique, a high internal energy fluid heated in a solar collector is used to power a conventional heat engine which drives ...
    • Solidification Of Steel Billets In Continuous Casting 

      Kandeil, A.Y.; Tag, I.A.; Hassab, M.A. ( Qatar University , 1991 , Article)
      For practical operation, it is necessary to know how the solidification of liquid steel progresses i.e. when and where a strand has completely solidified. Decisions on, the casting speed, the spray water flow rates and ...
    • Solubility and Tie Line Data for The System Sea Water - Xylene - n - Butanol 

      Salem, A. B.; Al-Kawari, Mohammad ( Qatar University , 1989 , Article)
      Ternary equilibrium data for the system Sea Water - Xylene-n-Butanol were determined at 23°C. The maximum solubility of n-Butanol in sea water was found to be 4.763% at room temperature. Xylene was found to be practically ...
    • Some Misconceptions About Plastic Degradation 

      Raouf, Mohamed Imad N. Raouf ( Qatar University , 1999 , Article)
      In consistence with the importance of implementing best utilization of human resources towards maintaining suitable healthy environment for our next generations, concepts and fundamentals upon which most researches on ...
    • Spreadsheet Class Scheduling For The College Of Engineering, University Of Qatar 

      El Bahrawy, Aly N. ( Qatar University , 1998 , Article)
      The process of preparing class schedules is a lengthy and painstaking experience, especially when the requirements on the system approach saturation capacity. Instructors have to be assigned to places, with different ...
    • A Spreadsheet Teaching Tool For Analysis Of Pipe Networks 

      El-Bahrawy, Aly Nabih ( Qatar University , 1997 , Article)
      Spreadsheets are used widely in engineering to perform several analysis and design calculations. They are also very attractive as educational tools due to their flexibility and efficiency. This paper demonstrates the use ...
    • Stability Analysis Of Digital Pd Control Applied To Flexible Systems 

      Fanni, Mohamed; Al-Salem, N. ( Qatar University , 2002 , Article)
      The work shows that the sampling in a digital PD controller of a flexible system may cause instability, while the continuous PD control system is stable. A procedure is introduced to define the stability regions analytically ...
    • Stability Of Square Interval Matrices For Discrete Time Systems 

      Rousa, Nabil S. ( Qatar University , 2001 , Article)
      New sufficient conditions for the Schur stability of interval matrices are provided. Moreover, a time saving version of a necessary and sufficient condition for the Schur stability of a class of interval matrices is ...
    • Structural Design Of Arch Profile And Depth — A Computer-Aided Study 

      El Hadidi, M. T. ( Qatar University , 1991 , Article)
      This paper presents a comparative study of some of the best known and widely used arch profiles, in an endeavour to investigating their structural performance and to determining optimum arch form and depth. Arch profiles ...
    • Structure Mixture Response Of Buildings Due To Simulated Earthquake Loading 

      Al Ansari, Mohammed S.; Senouci, Ahmed B. ( Qatar University , 2002 , Article)
      This paper presents two case studies to evaluate the performance of the structure mixture theory in the earthquake response analysis of buildings. In the first case study, the actual earthquake responses of the two-story ...
    • Study of A Time Dependent Double -Diffusive Salinity Problem 

      Tag, I.A.; Hassab, M.A. ( Qatar University , 1989 , Article)
      The time-dependent, double diffusive stability problem for a horizontal layer of salty water bounded by two rigid isothermal surfaces is analyzed using a linear perturbation technique. Initially, the layer is subjected to ...
    • Study of the influence of xylene-based chemical Additive on crude oil flow properties and Paraffin deposition inhibition 

      Bello, O. O.; Fasesan, S. O.; Akinyemi, 0. P.; Macaulay, S. R. A.; Latinwo, G. K.. ( Qatar University , 2005 , Article)
      Paraffin related problem appears through out the production process of nearly all kinds of crude oils all over the world. It also appears in the dewatering process and the long distance crude oil transportation. In Nigeria, ...