Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 314 for “"TK Electrical engineering. Electronics Nuclear engineering"”.
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Flashover performance of lightning protected buildings using scaled models and electric field analysis
In early era, Benjamin Franklin discovered that the application of Lightning Rod (also known as the Franklin Rod) method is found to be effectived as a lightning protective device for buildings. Hence, it was considered among the best solution to overcome the problems facing by publics due to …
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Performance characteristics on patch antenna with sar reduction using artificial magnetic conductor (amc) for wban applications
Great advances have been made in the area of wireless body area networks (WBANs) of improving wireless communication technology since the invention. These advances range in refining, size reduction and shape, gain improvement, more efficiency and combination of the requirements for applications …
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New d-piso architecture for dynamic symbol size digital baseband modulation implementation in FPGA
Dynamic symbol size modulation is a type modulation which could provide a fast transmission speed by removing the redundant symbol as compare to fixed symbol size modulation. The dynamic nature of the symbol created an additional problem in hardware design as the size of symbol needed to be defined …
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PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives
Among the different multiphase ac drive solutions, one of the most widely reported in the literature is the six-phase machine. The machines can be realised into two different configurations, symmetrical and asymmetrical. For the symmetrical configuration, the stator winding consists of two sets of …
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Numerical Study For Acoustic Micro-Imaging Of Three Dimensional Microelectronic Packages
Complex structures and multiple interfaces of modern microelectronic packages complicate the interpretation of acoustic data. This study has four novel contributions. 1) Contributions to the finite element method. 2) Novel approaches to reduce computational cost. 3) New post processing technologies …
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Integrated on-board battery chargers for EVs based on multiphase machines and power electronics
… on multiphase machines and multiphase power electronics. At present, EVs rely on three-phase systems for machine propulsion. However, recent advances in multiphase drive technology have firmly established their potential advantages over their three-phase counterparts for this application. One …
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Probing technique for energy distribution of positive charges in gate dielectrics and its application to lifetime prediction
… in gate dielectric, a higher operation electrical field, and a higher temperature. Despite of many years’ research work, there are questions on the correctness of the NBTI lifetime predicted through voltage acceleration and extrapolation. The conventional lifetime prediction technique …
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Advanced PID Control Optimisation and System Identification for Multivariable Glass Furnace Processes by Genetic Algorithms
This thesis focuses on the development and analysis of general methods for the design of optimal discrete PID control strategies for multivariable glass furnace processes, where standard genetic algorithms (SGAs) are applied to optimise specially formulated objective functions. Furthermore, a …
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Neural Model-Based Advanced Control of Chylla-Haase Reactor
The objective of this thesis is to develop advanced control method and to design advanced control system for the polymerization reactor (Chylla-Haase) to maintain the high accurate reactor temperature. The first stage of this research start with the development of mathematical model of the process. …
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ENERGY-EFFICIENT ROUTING ALGORITHMS FOR WIRELESS SENSOR NETWORKS
A wireless sensor network (WSN) is made of tiny sensor nodes usually deployed in high density within a targeted area to monitor a phenomenon of interest such as temperature, vibration or humidity. The WSNs can be employed in various applications (e.g., Structural monitoring, agriculture, …
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Modulation and control strategies for multilevel five-phase open-end winding drives
Industrial and automotive trends clearly demonstrate an increased interest in medium- and high-power variable speed drives. Despite constant progress in the technology, the semiconductor characteristics are still the bottleneck in drive designs, due to their limitations to block high voltage …
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Rheological characterisation of solder pastes and isotropic conductive adhesives (ICAs) for microsystems assembly technology
The printing of solder pastes through very small stencil apertures required for flip-chip pitch sizes, is expected to result in increased stencil clogging and incomplete transfer of paste to the printed circuit board pads. The paste printing process depends on conditions such as good paste roll, …
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RF techniques for IEEE 802.15.4: circuit design and device modelling
The RF circuitry in the physical layer of any wireless communication node is arguably its most important part. The front-end radio is the hardware that enables communication by transmitting and receiving information. Without a robust and high performance front-end, all other higher layers of signal …
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Modelling and analysis of asynchronous and synchronous torques in split-phase induction machines
In this thesis, the nature of asynchronous and synchronous torques in a split-phase induction machine is investigated and quantified. The equivalent circuit for this type of machine is derived using the rotating field theory. It is extended to include harmonic effects. Using this model, winding …
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Monte Carlo study of current variability in UTB SOI DG MOSFETs
The scaling of conventional silicon based MOSFETs is increasingly difficult into the nanometer regime due to short channel effects, tunneling and subthreshold leakage current. Ultra-thin body silicon-on-insulator based architectures offer a promising alternative, alleviating these problems through …
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Development of a discrete numerical approach to the Fredholm Integral Method for evaluating microwave scattering by irregular hydrometeors
… Fourier Transform of the scatterer; hence, for electrically small particles the angular spectrum is relatively smooth and the number of pivots required for integration is relatively low. The theoretical analysis of the first Born term is comparatively simple. Comparisons show a good agreement …
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Joint rate control and scheduling for providing bounded delay with high efficiency in multihop wireless networks
This thesis considers the problem of supporting traffic with elastic bandwidth requirements and hard end-to-end delay constraints in multi-hop wireless networks, with focus on source transmission rates and link data rates as the key resource allocation decisions. Specifically, the research …
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Experimental investigation of semiconductor losses in cryogenic DC-DC converters
… in terms of the performance of the power electronics or may enable other system benefits such as higher voltage lower current feedthroughs which reduce heat leakage into the cryostat. This Thesis studies the performance of several DC-DC power conversion techniques at temperatures down to …
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An investigation into controlling the growth modes of ferroelectric thin films using pulsed laser deposition and RHEED
Thin film ferroelectricss are widely considered for tunable microwave applications, the reduced small dimensions leading to low tuning voltages. The incipient ferroelectric strontium titanate is an ideal solution for tunable microwave devices, particularly in conjunction with high temperature …
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Micromachined microwave filters
Microwave circuits in the millimetre wave region demand low loss, and low dispersion transmission lines. The work carried out in this thesis is on low loss transmission lines and filters, based on a square coaxial transmission line which is made only of metal, avoiding dielectric and radiation …
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