Engineering Journal of Qatar University - [From 1988 TO 2005]: Recent submissions
Now showing items 181-200 of 221
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Effect Of Production Induced Stresses On Reservoir Productivity
( Qatar University , 2001 , Article)The importance of permeability sensitivity to the changes in pore pressure drop or effective overburden stress increase has been examined at laboratory using two types of rocks, sandstone and limestone. Whereas the ... -
Signal Identification Using A Microprocessor Based Phase Locked Loop System
( 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 ... -
Accelerating The Convergence Of Cubic Interpolation Method Using Concurrent Algorithm Based On The Transputer Technology
( Qatar University , 1992 , Article)This paper describes a concurrent method to speed up the convergence of the QIOM (Cubic Interpolation Optimization Method) to obtain the global minima for any nonlinear continuous function. The QIOM is a naturally slow, ... -
An Algorithm To Minimize Unused Lengths Of Steel Bars And Sections
( Qatar University , 1995 , Article)The reinforcement steel bars and other metal or wooden sections used in the construction industry are usually available in standard lengths and are cut in large numbers of specified lengths (pieces) according to the needs ... -
Hierarchical Floor Plan For Vlsi Integrated Circuits Based On Analytical Techniques
( Qatar University , 1990 , Article)The physical design of electronic circuits consists of transforming a design specification into a representation to be used in the manufacture of the physical circuits. At Very Large Scale Integration (VLSI) level it becomes ... -
Experimental And Modeling Of Friables And Stone Oil Reservoirs Consolidation Using Steel Making Slag
( Qatar University , 2001 , Article)A mathematical model was developed simulating the process of sand production in under downhole stress state. The model was derived based on Mohr-Colomb failure criterion, Darcy equation for radial flow and reservoir stress ... -
The Voltage Collapse Problem Based On The Power System Loadability
( Qatar University , 1997 , Article)This paper addresses the problem of voltage instability at which the power system reaches its maximum admissible load. A voltage collapse proximity indicator (VCPI) is derived and its performance is investigated. The VCPI ... -
How Top-Size Affects The Resilient Modulus Of Roadway Base Materials
( Qatar University , 1995 , Article)The American Association of State Highway and Transportation Officials (AASHTO) uses resilient modulus values as the load-carrying capacity parameter for all pavement materials. However, the maximum sample diameter in ... -
Comparison Of Metal Corrosion Inhibition By Gravimetric And Linear Polarization Resistance Methods
( Qatar University , 1992 , Article)Studies were conducted to evaluate the effectiveness of various dosages of the selected silicate and phosphate compounds applied for corrosion inhibition of cast iron, copper, lead, and galvanized steel specimens. The ... -
Application Of Artificial Neural Networks To Predict Wettability And Relative Permeability Of Sandstone Rocks
( Qatar University , 1996 , Article)An Artificial Neural Network (ANN) model based on the back-propagation technique is trained with a number of variables from experimentally established relative permeability curves. The reservoir core input data covers an ... -
Optical Matching For Microwave Active Devices
( Qatar University , 1997 , Article)This paper describes a microstrip optically controlled matching technique between microwave active devices with low impedance (less than 10 ohms) and a conventional 50 or 70 ohm communication system in the upper microwave ... -
Three Dimensional Analysis Of Skeletal Structures Considering Cracking
( Qatar University , 1992 , Article)A three dimensional computer model has been developed to analyze space structures containing cracked members. A new stiffness matrix for cracked space members has been obtained. This model takes into consideration crack ... -
Voltage Stability Margin Identification Using Local Measurements And Linear Kalman Filter
( Qatar University , 2002 , Article)Voltage stability investigation is of a great importance for long-term electric load expansion as well as power system operation. This paper presents a new algorithm for identification of voltage instability in a specified ... -
Measurement Of Thermal Conductivity Of Thermally Low-Conducting Materials
( 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 ... -
Chebyshev Expansion Of The Flow In A Spinning And Coning Cylinder
( Qatar University , 1994 , Article)This paper is concerned with the calculation of the moments exerted by a viscous fluid on the walls of a cylinder that is spinning about its axis and coning about an axis that passes through its center of mass. For small ... -
Repetitive Control Based Pwm Inverter Dead-Time Compensation For Ac Servo Drive
( 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 ... -
Random Distributed Algorithms For Clock Synchronization
( 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 ... -
Use Of Spreadsheets For Rainfall-Runoff Calculations
( Qatar University , 1996 , Article)The nature of rainfall-runoff calculations necessitates the use of different equations for calculating losses and several response functions to route the effective rainfall hyetograph through the catchment. The ... -
An Improved Model Describing Mass Transfer In Three-Phase Fluidized Beds
( Qatar University , 1990 , Article)A model for describing mass transfer in three-phase fluidized beds has been developed and tested using experimental data. The presence of two distinguishable mass transfer zones in three-phase fluidized beds led to the ... -
Microcomputer Aided Selection Of Robot Manipulators
( 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 ...
