Browsing Engineering Journal of Qatar University - [From 1988 TO 2005] by Publication Date
Now showing items 21-40 of 221
-
Investigation of In-Service Parameters Influencing the Wear and Wear Rate for Two Rubbing Surfaces
( Qatar University , 1989 , Article)A study has been conducted on the volumetric wear and wear rate as well as the quality of the surfaces produced by rubbing brass and steel specimens. Effect of end pressure and total sliding distance between the two rubbed ... -
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 ... -
On Loss Probabilities for Delayed - Access Circuit - Switched Multiplexers
( Qatar University , 1989 , Article)Multiplexing schemes for packetized circuit-switched sources are characterized by an avoidable accessing delay. In the present work it is shown that, contrary to conventional immediate-access multiplexing schemes, one can ... -
Flow and Fracture Behaviour of Tungsten Fiber Reinforced Superalloy Composites-Effect Of Specimen Geometry
( Qatar University , 1989 , Article)The influence of aspect ratio (i.e. width to height ratio) of test specimens on the flow and fracture behaviour of fiber reinforced composites is herein examined. The composite material was prepared by isostatic pressing ... -
Analysis of A Screen Type Solar Air Collector Without Transparent Cover
( Qatar University , 1989 , Article)The performance of a screen type solar air collector of different uniform mesh sizes and without a glass cover is investigated theoretically. Formulation of simultaneous radiation and convection heat transfer for a semi-steady ... -
A Model Reference Adaptive Control Scheme with External Controllers
( Qatar University , 1989 , Article)A new model reference adaptive control scheme, suitable for linear multivariable discrete time systems, is proposed. A set of parameter adaptation algorithms are developed based on the validity of perfect matching between ... -
Educational Performance of Students In A New College Of Engineering: A Computer-Aided Study
( Qatar University , 1989 , Article)A data-base computer package is herein developed to provide an effective tool lor llie studv. evaluation and rectification of tile academic performance of university students. As a test case, the newly established Faculty ... -
Humidification - Dehumidification Desalination Process Using Waste Heat from A Gas Turbine By
( Qatar University , 1989 , Article)This paper presents a hutnidification-dehumidification desalination process using waste heat from a gas turbine power plant. In this process, the air is used as the operating fluid instead of water. The process has many ... -
Control of Void Formation During Forging of Advanced Fiber Reinforced Composite Materials
( Qatar University , 1989 , Article)Increased interest has emerged in recent years in the development of fiber reinforced superalloy composite materials and the fabrication processes to produce composite turbine vanes and blades for advanced gas turbine ... -
Refractivity Statistics For Two Countries In The Middle East
( 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 ... -
Secondary vs. Tertiary oil recovery from a two-dimensional porous media by microemulsion flooding
( 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 ... -
Full Scale Performance of Primary Settling Tanks
( Qatar University , 1989 , Article)The characteristics and the flowrate of municipal wastewater from the city of Doha, located in the Arabian Gulf have been studied to examine their effect on the performance of the primary settling tanks at the local sewage ... -
Estimates of Potential Evapotranspiration Over The State of Qatar
( Qatar University , 1989 , Article)Several methods for the estimation of potential evapotranspiration are reported in the literature covering a wide variation in the complexity of calculation and nature of climatic data required. Five of the more commonly ... -
An Optimum Performance of A Flat-Type Solar Air Heater With A Porous Absorber
( Qatar University , 1989 , Article)This investigation is concerned with the design and performance of a flat solar air heater in which air flows perpendicular from a vented transparent cover through a porous absorber plate. The design phase involves a ... -
Study of A Time Dependent Double -Diffusive Salinity Problem
( 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 ... -
Effect of sulphates in cement (containing 5% pozzolana) and in sand on the correlation between compressive strength and u.p.v. of concrete of different mixes
( Qatar University , 1990 , Article)Sulphates may be found in any of the raw materials of cement. Sand contaminated with sulphates is currently a local problem because of the difficulty in obtaining well-graded sand which could be used in concrete that has ... -
Influence of Surface Finish on Fatigue Life of Steel Specimens Subjected to Pure Bending
( Qatar University , 1990 , Article)It has long been appreciated that surface conditions exert significant influence on fatigue behavior. The new capabilities of identifying and measuring surface parameters together with the significant development in data ... -
A Computer - Aided Experimental Setup For Studying Sorption And Desorption Kinetics
( Qatar University , 1990 , Article)The details of a computer-aided experimental setup are reported in this communication. This set-up produces high-quality data which can be utilized in stuying sorption and desorption kinetics. -
Chemical engineering design: Plaint project process phreshman
( Qatar University , 1990 , Article) -
Heuristic analysis of brackishwater treatment by reverse osmosis process
( Qatar University , 1990 , Article)Treatment of brackish water and sea water with the help of reverse osmosis process is feasible and a viable solution to meet the fresh water deficiency in an arid region. Total dissolved solids can be reduced to a level ...