As high-temperature superconductor technology approaches commercial applications, for example superconducting magnetic energy storage, superconducting fault current limiters, and superconducting rotary machines for marine propulsion, it is timely to consider the possibility of i…
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Granular materials are important for many different disciplines, e.g. geomechanics, civil engineering and chemical engineering. Many approaches have been used to model their behaviour, but one of the best and most important is the Discrete Element Method (DEM). The DEM was first…
Ocean acoustic tomography (OAT) is a method for mapping the physical characteristics of the world’s oceans. This technique enables the properties of a region of ocean – its temperatures, salinities, densities, and current speeds – to be inferred by measuring the propagation time…
This thesis focuses on multimodal interactions for the design of a learning environment. The process of designing such systems involves studying the benefits of multimodal interactions in learning. Therefore, it analyses the structure of the interactive space between the learner…
The Class E power amplifier has very high drain efficiency under quasi-static conditions, and is a good candidate for Envelope Elimination and Restoration (EER) or other polar techniques. Unfortunately it has an unusual carrier frequency response, for which no analytic expressio…
Both the experimental and the modelling techniques have been investigated and used to investigate factors that influence the formation, quality and reliability of electronic packaging interconnections formed using solder alloys and anisotropic conductive films (ACFs). The wettin…
Most of the analysis techniques available for planning and operation of multiphase power systems are based upon the assumption that the network operates under perfectly balanced conditions. The advantage of this assumption from the modelling view point is that only one phase of …
This thesis describes the development of novel microstructured optical fibres (MOFs), namely holey optical fibres (HFs), based on a commercial highly nonlinear non-silica glass: By taking the advantages of the zero dispersion of the HFs at 1 μm and 1.55 μm, the SC studies are ca…
The increasing demand for greater storage densities poses constant challengesfor the magnetic recording industry. The move to perpendicularrecording occurred recently as this provides one·way of increasing thestorage density. For further advance in the techriology it is impor…
In this work we present an analysis of gas sensors based on correlation spectroscopy with a Fabry-Perot interferometer (FPI). In this technique the spectral FPI transmission fringe pattern is matched with ro-vibrational absorption lines. To produce the cross correlation principl…
In this thesis I investigate aspects of dispersion controlled high nonlinearity all silica holey fibre, including design, fabrication, sample applications, and modelling. The latest work has been focussed on controlled structural variation of holey fibres along their length to o…
Optical fibres are the transport medium of today's digital information. Nowadays, modern optical telecommunication systems make use of semiconductor optoelectronic devices to generate, control and detect light. The union of the two technologies, namely fibre photonics and semico…
Thin film solar cells with a band gap graded in the thickness direction were prepared by vacuum evaporation of various alloys of Cadmium Sulphide (CdS) and Cadmium Telluride (CdTe) onto glass substrates. Theoretical computer analyses were carried out and show that a solar cell w…
In this thesis we attempt to predict the performance of a device, known as a flow coupler, which consists of an M.H.D. generator coupled to an M.H.D. pump so that one stream of fluid is induced to move by the motion of another. The change of magnetic field experienced by a movin…
The work in this thesis is concerned with growth of low dimensional materials in a variety of morphologies which have potential renewable energy generation applications. The work described within demonstrates synthesis methods for the production of materials with thermoelectric …
The research presented in this thesis seeks to separate the notion of collaborative sensemaking into two different modes; a semantic mode, which describes the cognitive and meta-cognitive processes of sensemaking and a pragmatic mode which recognises the constraints under which …
The work described in this thesis concerns the integration of push-pull class B amplifier and antenna modules. Push-pull class B is well-known with its fruitful advantages of using differential feeding technique, resulting in low distortion, reasonably high efficiency and high o…
This study presents a novel synthesis technique for Butler matrices that include filter transfer functions through a circuit based only on resonators. The Butler matrix is the fundamental building block to split and recombine the signals in Multi-port Power Amplifiers, where mul…
Diagnosing the type of fault and its location in a transmission lines is performed by a variety of techniques and mainly relies on monitoring currents and voltages in the transmission line. Accurate fault diagnosis plays an important role in improving the overall system reliabil…