Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 8 of 8

Full-Text Articles in Engineering

Experimental Investigation Of Moisture Migration In Concrete, R. P. West, Niall Holmes Sep 2001

Experimental Investigation Of Moisture Migration In Concrete, R. P. West, Niall Holmes

Conference papers

The ability to be able to predict the state of dryness of a concrete floor slab is a practical need in the construction industry. Current popular methods, including the surface hygrometer and vapour emission tests, only indicate surface dryness, with consequent uncertainties in the quantity of residual moisture deep within the slab. This paper describes the variation in moisture condition with depth for a number of slabs under different drying conditions, as established using a new probe which can reliably determine the relative humidity at any depth. From this it is concluded that results from the conventional tests need to …


Job Shop Scheduling Problem: An Overview, Amr Arisha, Paul Young, Mohie El Baradie Jul 2001

Job Shop Scheduling Problem: An Overview, Amr Arisha, Paul Young, Mohie El Baradie

Conference papers

The Job-shop scheduling is one of the most important industrial activities, especially in manufacturing planning. The problem complexity has increased along with the increase in the complexity of operations and product-mix. To solve this problem, numerous approaches have been developed incorporating discrete event simulation methodology. The scope and the purpose of this paper is to present a survey which covers most of the solving techniques of Job Shop Scheduling (JSS) problem. A classification of these techniques has been proposed: Traditional Techniques and Advanced Techniques. The traditional techniques to solve JSS could not fully satisfy the global competition and rapidly changing …


Comparison Of Two B-Polynomial Methods: Application To The Identification Of Time Delayed Processes, Ruiyao Gao, Aidan O'Dwyer Jan 2001

Comparison Of Two B-Polynomial Methods: Application To The Identification Of Time Delayed Processes, Ruiyao Gao, Aidan O'Dwyer

Conference papers

An extensive literature exists on the estimation of the model parameters of time delayed processes. The objective of this paper is to review the main B-polynomial approaches to the delay estimation problem. More specifically, two algorithms are discussed and compared theoretically and in simulation. The algorithms involve various procedures to assess how the model relates to the observed data, to a priori knowledge, and to the algorithms’ intended use. Simulation results indicate that both the algorithms can suitably identify the model parameters, including the time delay. This paper also discusses advantages and disadvantages of the methods and gives some guidelines …


Pi And Pid Controller Tuning Rule Design For Processes With Delay, To Achieve Constant Gain And Phase Margins For All Values Of Delay, Aidan O'Dwyer Jan 2001

Pi And Pid Controller Tuning Rule Design For Processes With Delay, To Achieve Constant Gain And Phase Margins For All Values Of Delay, Aidan O'Dwyer

Conference papers

This paper will discuss the design of PI and PID controller tuning rules to compensate processes with delay, that are modelled in a number of ways. The rules allow the achievement of constant gain and phase margins as the delay varies.


Strategic Drivers Of Software Quality: Beyond External And Internal Software Quality, Ronan Fitzpatrick Jan 2001

Strategic Drivers Of Software Quality: Beyond External And Internal Software Quality, Ronan Fitzpatrick

Conference papers

Software quality is often considered in terms of the contractual requirements between the supplier and acquirer as described in ISO/IEC 12207 and focuses on software life cycle processes. However, beyond these processes acquirer organisations need to address other issues like complying with new legislation, securing return on investment, and achieving competitive support from their new software investments. Supplier organisations also have issues that they must manage. This paper addresses all of these issues and presents eleven issues, which it calls strategic drivers. Then, using the SOFTWARE QUALITY STAR, builds a new conceptual model where each strategic quality driver is defined …


A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann Jan 2001

A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann

Conference papers

A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation pattern bandwidth is also investigated


A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann Jan 2001

A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann

Conference papers

A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation pattern bandwidth is also investigated


Experimental Investigation Of Performance Of A Single Phase Upqc For Voltage Sensitive And Non-Linear Loads, Malabika Basu, S. P. Das, Gopal K. Dubey Jan 2001

Experimental Investigation Of Performance Of A Single Phase Upqc For Voltage Sensitive And Non-Linear Loads, Malabika Basu, S. P. Das, Gopal K. Dubey

Conference papers

A unified power quality conditioner (UPQC) is proposed in this paper. It protects the consumer at the load end from supply voltage sag, and provides unity power factor condition at the utility for different values of load power factor. A PC-based closed loop control scheme is proposed and experimental investigation is carried out in the laboratory. Selected experimental results are reported along with control circuit and phasor diagram to validate the proposition.