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Thesis (Ph.D.) -- McMaster University, 1997. / Includes bibliographical references (leaves 170-178). Also available via World Wide Web.

Thesis (M. Phil.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 69-74).

Wong Shiu Kai Raymond. / Thesis submitted in: July 2003. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 147-157). / Abstracts in English and Chinese. / ABSTRACT --- p.I / ACKNOWLEDGEMENTS --- p.V / TABLE OF CONTENTS --- p.VI / LIST OF ABBREVIATIONS --- p.IX / LIST OF TABLES --- p.X / LIST OF FIGURES --- p.XII / LIST OF PLATES --- p.XVII / Chapter 1. --- INTRODUCTION / Chapter 1.1 --- Landfilling of Solid Wastes --- p.1 / Chapter 1.2 --- Landfilling in Hong Kong --- p.3 / Chapter 1.3 --- Problems of Landfill Leachate --- p.5 / Chapter 1.4 --- Generation of Landfill Leachate --- p.6 / Chapter 1.5 --- Chemical Properties of Landfill Leachate --- p.9 / Chapter 1.6 --- Ecotoxicity of Landfill Leachate --- p.16 / Chapter 1.7 --- Identification of Leachate Toxicity / Chapter 1.7.1 --- Problem of identification of toxicants in landfill leachate --- p.21 / Chapter 1.7.2 --- Toxicity Identification Evaluation --- p.22 / Chapter 1.8 --- Aims of Thesis --- p.27 / Chapter 2. --- CHEMICAL CHARACTERIZATION OF LANDFILL LEACHATE / Chapter 2.1 --- Introduction --- p.30 / Chapter 2.2 --- Materials and Methods / Chapter 2.2.1 --- Site description --- p.33 / Chapter 2.2.2 --- Leachate collection --- p.38 / Chapter 2.2.3 --- Chemical analysis --- p.38 / Chapter 2.2.4 --- Statistical analysis --- p.41 / Chapter 2.3 --- Results and Discussion / Chapter 2.3.1 --- Chemical properties of landfill leachates --- p.41 / Chapter 2.3.2 --- Variation of chemical properties with different ages --- p.53 / Chapter 2.3.3 --- Variation of chemical properties with different season --- p.56 / Chapter 2.3.4 --- Principal Component Analysis --- p.85 / Chapter 2.4 --- Conclusions --- p.91 / Chapter 3. --- ECOTOXICOLOGICAL CHARACTERIZATION OF LANDFILL LEACHATE / Chapter 3.1 --- Introduction --- p.93 / Chapter 3.2 --- Materials and Methods / Chapter 3.2.1 --- Site description --- p.95 / Chapter 3.2.2 --- Leachate collection --- p.95 / Chapter 3.2.3 --- Toxicity tests --- p.95 / Chapter 3.2.3.1 --- Microtox® test --- p.96 / Chapter 3.2.3.2 --- Protozoan bioassay --- p.97 / Chapter 3.2.3.3 --- Algal bioassay --- p.99 / Chapter 3.2.3.4 --- Crustacean bioassays --- p.102 / Chapter 3.2.3.5 --- Statistical analysis --- p.104 / Chapter 3.3 --- Results and Discussion / Chapter 3.3.1 --- Leachate toxicity --- p.105 / Chapter 3.3.2 --- Sensitivity of tested organisms --- p.110 / Chapter 3.3.3 --- Principal Component Analysis --- p.113 / Chapter 3.3.4 --- Correlation with chemical properties --- p.116 / Chapter 3.4 --- Conclusions --- p.120 / Chapter 4. --- TOXICITY IDENTIFICATION EVALUATION OF MAJOR TOXICANTS IN LANDFILL LEACHATE / Chapter 4.1 --- Introduction --- p.122 / Chapter 4.2 --- Materials and Methods / Chapter 4.2.1 --- Site description --- p.124 / Chapter 4.2.2 --- Toxicity bioassays --- p.124 / Chapter 4.2.3 --- Phase I Toxicity characterization --- p.125 / Chapter 4.2.4 --- Phase II Toxicity identification and multiple manipulations --- p.126 / Chapter 4.2.5 --- Phase III Toxicity confirmation --- p.128 / Chapter 4.3 --- Results and Discussion / Chapter 4.3.1 --- Chemical properties of collected sample --- p.129 / Chapter 4.3.2 --- Phase I results --- p.130 / Chapter 4.3.3 --- Phase II results --- p.132 / Chapter 4.3.4 --- Phase III results --- p.138 / Chapter 4.3.5 --- Use of TIE in leachate monitoring --- p.139 / Chapter 4.4 --- Conclusions --- p.140 / Chapter 5. --- OVERALL CONCLUSIONS --- p.142 / REFERENCES --- p.147

With the rapid growth of the penetration of wind power into the power system, fixed series compensation is considered as an economic solution to increase power transfer capability. This will render the power system vulnerable to Sub-Synchronous Resonance (SSR). This thesis conducts research on the effect of wind turbines represented by Fixed Speed Induction Generator-Based Wind Turbines (FSIG-WTs) and Fully Rated Converter-Based Wind Turbines (FRC-WTs) on damping SSR. Firstly, SSR is investigated through mathematically modelling IEEE First Benchmark Model (FBM) using MATLAB package. Modal analysis is used to study SSR over a wide range of series compensation percentages. Secondly, the effect of incorporating FSIG-WTs into FBM on SSR is studied over a wide range of series compensation percentage and different power size of FSIG-WTs. Furthermore, the ability of the grid-side converters of the FRC-WTs connected with the FBM to damp SSR occurrence in the steam turbine shafts is evaluated using two different types of control. An optimal controller based on a Linear Quadratic regulator (LQR) has been designed as an auxiliary controller of the grid-side converter of FRC-WTs. A full-order observer was designed to estimate the unmeasured state variables to enable a vii full-state feedback. Finally, eigenvalue sensitivity was studied to choose the most suitable feedback signal for an SSR damping controller. Lead/Lag compensation controller based on the residue method is designed as an auxiliary controller within the grid-side converters of FRC-WTs. Eigenvalue analysis and time domain simulations over widely varying levels of series compensation have been carried out. The simulation studies were carried out in MATLAB and PSCAD. Connecting FSIG-WTs to the FBM increases the range of series compensation level at which SSR can occur. Therefore, it was shown that FSIG-WTs have an adverse effect on the SSR occurring at the multi-mass synchronous generator. If the system is visible, LQR as an auxiliary damping controller within the grid-side converters of FRC-WTs is an effective controller to damp SSR over a wide range of series compensation percentages. Based on eigenvalue sensitivity technique, synchronous generator speed deviation is the most suitable feedback signal for damping SSR occurrence in the steam turbine shafts.

In this EngD project I developed a new, analytic equation of state for use in the area of CCS pipeline transport. It was my aim to design a model which would exhibit a high degree of accuracy within the anticipated window of operation of CCS pipelines; from 260 to 335K and 1 to 200bar, whilst simultaneously retaining a simplicity and ease-of-use, a lack of which made some other available equations particularly unwieldy. Having conducted a comprehensive literature review and attended many academic and industrial conferences throughout this project, I felt that there was a need for an equation of state which could perform both these functions. This was the key motivation for my work, and the model presented in this thesis was developed in order that it might contribute towards negating the many concerns that currently surround the pipeline transport stage of CCS. I aimed for the proposed model to display a complexity approaching that of some of the simpler equations currently available, whilst incorporating sucient flexibility to give thermodynamic predictions to a standard approaching that of those which are more complicated. I defined criteria by which the proposed model could be judged, so that it could be applied with condence in the determination of the physical properties of carbon dioxide mixtures during CCS pipeline transport. Work was carried out by fitting the parameters of the proposed model to experimental data gathered from the literature, so that it would be able to determine the homogeneous phase pressure and vapour-liquid equilibrium behaviour of carbon dioxide and other relevant gas mixtures. The project yielded a number of excellent outputs, not least the satisfaction of the primary aim which was the proposal of a model, which through this EngD, I demonstrated had the ability to meet the demands that were set. In carrying out this work, I also developed several highly useful auxiliary mathematical methods which helped in ensuring the proposed model was as accurate as possible. For the case of modelling pure carbon dioxide, the proposed equation worked exceptionally well, providing highly accurate predictions for homogeneous density and vapour liquid equilibrium, which were well within the targets set. A paper on this was published in May 2013. In extending the model to incorporate some binary mixtures I again found that it demonstrated a clear ability to capture the necessary physical behaviours within the target range. I concluded with suggestions as to ways in which the work presented here could be developed further, as well as the many avenues for future work in other areas that this EngD project had opened up.

The main aim of this research is to investigate occupants’ thermal comfort and energy performance of multi-storey residential buildings in one of the major cities in Libya (Darnah). The work was implemented in stages as follows: 1. Gathering and analysing real weather data from a number of locations in Libya. 2. Gathering and analysing building data from residential multi-storey blocks in Darnah. 3. Conducting preliminary computer analyses using the above information to get a better idea about thermal conditions inside multi-storey block flats in Darnah. 4. Visiting Darnah and collecting real data using specifically designed survey or questionnaire forms to understand and assess how people feel while living inside their flats. 5. Analysing the computer results and field data and trying to come up with solutions to improve existing multi-storey blocks in terms of indoor climate and energy consumption and introducing guidelines for designers of new buildings in Libya. The subjective data was collected and tabulated by using a questionnaire, which has been widely used and shown to be effective, to determine people's responds through questions modified especially for the comfort purpose. Questionnaires were collected from households of 12 buildings: involving a total of 337 flats. The questionnaires compare the significance of the thermal sensation, the thermal comfort, and the building design. The results show that the thermal comfort is not satisfied, unless modified, and improving take place in these case study buildings. Thus a modification is proposed, the results from the present study show also that the insulation material is essential in this type of climate and can help to reduce up to 63% of heat gain and a reduction of 6 degrees of indoor temperature. Results also indicate that the construction of residential dwellings using existing materials is less conducive to the climatic conditions of hot dry climates and not suitable for the occupants’ requirements of comfort. Human thermal comfort was assessed using the adaptive model, to show that the climate and building’s envelope have a significant impact on human comfort perception and indoor environment. This research is mainly aimed at "explaining" the trends in the energy flows within buildings under the climatic conditions of Mediterranean zones and to establish a comfort zone for occupants within this type of climate. The results should help in the formulation of design guidelines for use in the process of building design by builders, architects and engineers. Also this research is in line with the Libyan’s government aim to make better use of renewable energy sources such as the sun for keeping buildings comfortable for their occupants.