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Now showing items 11-20 of 35
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 ...
Solar Water Pumping — An Analytical Overview
(
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 ...
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 ...
Designing Air Intake Ducts for High Speed Flight
(
Qatar University
, 1988 , Article)
A proven duct flow model is used to examine the influence of the intake duct geometric and inlet flow parameters on the pressure recovery performance of intake ducts for high speed flight. The geometric parameters include: ...
Design of Smoke Generator for Flow Visualisation
(
Qatar University
, 1988 , Article)
Described in this paper is an alternative method for smoke generation for flow visualisation in low speed (subsonic) wind tunnel work. This method makes use of the smoke generating characteristics of Ammonia and Sulphur ...
Material Behaviour Under Corrosive Environment — Guide For Material Selection
(
Qatar University
, 1988 , Article)
In this paper, the behaviour of engineering materials as influenced by fluid velocity, operating temperature, humidity and duration of exposure to chemical and/or electro-chemical action is carefully studied, corrosive ...
A Compressive Strength Criterion for Anisotropic Rock Materials
(
Qatar University
, 1988 , Article)
This paper puts forward a general compressive strength criterion for anisotropic rock materials under multiaxial state of stress. The proposed criterion, is a generalization of the Von Mises yield criterion for ductile ...