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Dissertations / Theses on the topic 'Electronics Nuclear engineering'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Qian, Xiaofeng. "Electronic structure and transport in molecular and nanoscale electronics." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44783.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2008.<br>Includes bibliographical references (p. 239-256).<br>Two approaches based on first-principles method are developed to qualitatively and quantitatively study electronic structure and phase-coherent transport in molecular and nanoscale electronics, where both quantum mechanical nature of electrons and dimensionality of systems play the critical roles in their electronic, magnetic and optical properties. Our first approach is based on Green's function method with ab initio quasiatomic orbita

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2

Navaraj, William Ringal Taube. "Inorganic micro/nanostructures-based high-performance flexible electronics for electronic skin application." Thesis, University of Glasgow, 2019. http://theses.gla.ac.uk/40973/.

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Electronics in the future will be printed on diverse substrates, benefiting several emerging applications such as electronic skin (e-skin) for robotics/prosthetics, flexible displays, flexible/conformable biosensors, large area electronics, and implantable devices. For such applications, electronics based on inorganic micro/nanostructures (IMNSs) from high mobility materials such as single crystal silicon and compound semiconductors in the form of ultrathin chips, membranes, nanoribbons (NRs), nanowires (NWs) etc., offer promising high-performance solutions compared to conventional organic mat

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3

McNeill, John Neville. "Current transformer circuits for power electronics applications." Thesis, Edinburgh Napier University, 2008. http://researchrepository.napier.ac.uk/Output/6196.

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This thesis investigates the operation of the current transfonner (CT) when sensing retum-to-zero current pulses in power electronic circuitry. The CT's output signal is nonnally rectified when sensing current pulses and the effects of the different rectification techniques on peak current and average current droop are evaluated. Initially, the various current sensing techniques and their application in power electronics circuits are reviewed. The CT and both diode and synchronous rectification are then reviewed in more detail. Operation of the CT with diode rectification (DR) and natural rese

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4

Beresna, Martynas. "Polarization engineering with ultrafast laser writing in transparent media." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/349212/.

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In this thesis novel developments in the field of femtosecond laser material processing are reported. Thanks to the unique properties of light-matter interaction on ultrashort time scales, this direct writing technique allowed the observation of unique phenomena in transparent media and the engineering of novel polarization devices. Using tightly focused femtosecond laser pulses’, high average power second harmonic light was generated in the air with two orders of magnitude higher normalised efficiency than reported by earlier studies. We also demonstrated optical vortex generation in the air

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5

Lin, Tzu-Yung. "Advanced electronics for Fourier-transform ion cyclotron resonance mass spectrometry." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/55048/.

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With the development of mass spectrometry (MS) instruments starting in the late 19th century, more and more research emphasis has been put on MS related subjects, especially the instrumentation and its applications. Instrumentation research has led modern mass spectrometers into a new era where the MS performance, such as resolving power and mass accuracy, is close to its theoretical limit. Such advanced performance releases more opportunities for scientists to conduct analytical research that could not be performed before. This thesis reviews general MS history and some of the important miles

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6

Khalid, Muhammad Arslan. "Engineering surface acoustic wave sensing and diagnostic devices." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/30999/.

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Globally, over 50% of deaths occur due to the top 10 global diseases which include cardiovascular disease, cancer and infectious diseases. Low and middle-income countries (LMICs) are disproportionately affected. 80% of all deaths due to non-communicable diseases occur in low and middle income countries and with numbers on the rise. In these disadvantaged and vulnerable populations, diseases are often detected late. The treatment required is therefore increasingly extensive and expensive. Early detection, treatment and monitoring coupled with life-style changes can reduce mortality and morbidit

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7

Martinez, Manuel Madrigal. "Modelling of power electronics controllers for harmonic analysis in power systems." Thesis, University of Glasgow, 2001. http://theses.gla.ac.uk/2836/.

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The research work presented in this thesis is concerned with the modelling of this new generation of power electronics controllers with a view to conduct comprehensive power systems harmonic analyses. An issue of paramount importance in this research is the representation of the self-commutated valves used by the controllers addressed in this work. Such a representation is based on switching functions that enable the realization of flexible and comprehensive harmonic models. Modularity is another key issue of great importance in this research, and the model of the voltage source converter is u

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8

Stevenson, Anthony John. "Development of a novel electrochemical pyroprocessing methodology for spent nuclear fuels." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39300/.

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Nuclear power remains the most dense and reliable primary form of energy supply worldwide. Electricity generation via fission is also inherently carbon free, with environmental footprints rivalling modern renewable options. However issues arise from the production of highly irradiated spent fuels, with current management options limited to geological repository storage or, more desirably, closing of the fuel cycle by partitioning to recover fissionable species. Extensive research has been pursued over the past half century in an effort to address an accumulating oxide spent fuel inventory and

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9

Wu, Yudong. "Simulation of graphene electronic devices." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1554/.

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Since the publication of research in the mid-1980s describing the formation of freeform graphene there has been an enormous growth in interest in the material. Graphene is of interest to the semiconductor industry because of the high electron mobility exhibited by the material and, as it is planar, it is compatible with silicon technology. When patterned into nanoribbons graphene can be made into regions that are semiconducting or conducting and even into entire circuits. Graphene nanoribbons can also be used to form the channel of a MOSFET. This thesis describes numerical simulations undertak

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10

Blanco-Gomez, Gerald. "Engineering surfaces to control microfluidic flow in lab-on-a-chip devices." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1194/.

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Laboratory-on-a-chip technologies have received growing interests in last 20 years as a method to miniaturise, parallelise, and optimise chemical reactions and biological detections normally carried out at the macro-scale. As a generic tool, microfluidics can be presented as the science of regulation, controlling the transport of matter, delivering reagents for reactions occurring on-chip. This highly interdisciplinary research field exploits the increase in the resolution of methods of detection whilst reducing the necessary amount of material to react or be detected. The domain of microfluid

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11

Livada, M. "Implicit network descriptions of RLC networks and the problem of re-engineering." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17916/.

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The thesis deals with aspects of Systems Re-engineering specialised to the case of passive electrical networks. Re-engineering is a problem different from traditional control problems and this emerges when it is realised that the systems designed in the past cannot perform according to the new performance requirements and such performance cannot be improved by traditional control activities. Re-engineering implies that we intervene in early stages of system design involving sub-processes, values of physical elements, interconnection topology, selection of systems of inputs and outputs and of c

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12

Hadad, Kamal 1958. "Measurement of the e-folding time in prompt critical pulsing, for the University of Arizona TRIGA Mark I reactor." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277320.

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An electronic system was designed to receive a signal from a Self Powered Neutron Detector (SPND) and measure the initial period (e-folding time) of the TRIGA reactor at the University of Arizona. The design and fabrication of the SPND used was part of this work. The electronic system together with the SPND were used to construct a reactivity worth calibration curve for the transient rod based on pulse measurements.

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13

Ozga, Deborah Ann. "The principles of nuclear control." Thesis, University of Southampton, 2001. https://eprints.soton.ac.uk/43760/.

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This thesis develops the principles of nuclear control which are derived from control models initially developed in the 1940s, namely, The Acheson-Lilienthal Report, and the Baruch Plan. Authors of these works aspired to create a grand disarmament scheme establishing an international authority to manage nuclear energy and to prevent states from diverting nuclear energy production to nuclear weapon development. They identified principles, which they believed needed to be incorporated in any nuclear control plan, if the plan was to be effective in promoting international security and stability.

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14

Sones, Collin Lawrence. "Domain engineering techniques and devices in lithium niobate." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15474/.

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This thesis presents the results from investigations directed at novel approaches to domain engineering single-crystal congruent lithium niobate at the micron/sub-micron scale for practical device applications. Experimental etch-rate measurements from a parametric study of etch-rates and etch-quality of single-crystal lithium niobate z-faces, as a function of specific ratios for mixtures of HF/HNO3, to ascertain whether the widely-employed 1:2 mixture was in fact optimum for achieving the largest differential etch-rates between lithium niobate z-faces, revealed that pure HF produced an etch-ra

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15

Sumsurooah, Sharmila. "Robust stability analysis of power electronic systems." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/37829/.

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Power electronics is the enabling technology that can put transportation on a more sustainable pathway. The key problem with power electronic (PE) systems is that they are prone to instability. Classical techniques are insufficient at assessing the stability of these systems, as they do not take into account the uncertain nature of physical systems. This thesis presents the structured singular value (SSV) method as an effective, reliable and robust stability analysis approach that justifiably incorporates uncertainties which are inherently present in physical systems. Although the SSV approach

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16

Jahdi, Saeed. "Analysis of dynamic performance and robustness of silicon and SiC power electronics devices." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/82110/.

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The emergence of SiC power devices requires evaluation of benefits and issues of the technology in applications. This is important since SiC power devices are still not as mature as their silicon counterparts. This research, in its own capacity, highlights some of the major challenges and analyzes them through extensive experimental measurements which are performed in many different conditions seeking to emulate various applications scenarios. It is shown that fast SiC unipolar devices, inherently reduce the switching losses while maintain low conduction losses comparable with contemporary bip

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17

Nguyen, Son Hung 1966. "Topographic classification of nuclear medicine images for tumor detection." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278117.

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Topographic classification is a nonlinear technique used to enhance nuclear medicine images for tumor detection. Second-order directional derivatives are computed at each pixel location after performing a least-squares fit of the underlying surface using a bivariate cubic polynomial. The eigenvalues and their corresponding eigenvectors computed from the Hessian matrix determine which topographic feature is assigned to the image pixel. Parameter selection for the mask size, curvature threshold, and angle thresholds are chosen to yield the "best" classified image. The classifier is applied to cl

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18

Fitzpatrick, Dominic Michael Fitzpatrick. "Novel MMIC design process using waveform engineering." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/47079/.

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It has always been the case that talented individuals with an innate understanding of their subject have been able to produce works of outstanding performance. The purpose of engineering science is to define ways in which such achievements can be made on a regular,predictable basis with a high degree of confidence in success. Some tools, such as computers, have enabled an increase in speed and accuracy, whilst others have given a dramatic increase in the insight into the operation or behavior of materials; the electron microscope for instance. Still others have enabled the creation of devices

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19

Jones, Jeffrey Alun. "Electronic reliability prediction : a study over 25 years." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/1991/.

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This thesis describes research work that the author has undertaken and published in the field of electronic reliability prediction techniques over the last 25 years. Reliability prediction is an important area since it has been part of the backbone of reliability engineering in one form or another for over fifty years. The author has over 45 publications that are within the area of reliability prediction and 13 of these have been selected for review in this thesis. In order to show how the author’s work has contributed to the field of reliability prediction this document also contains informat

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20

Mohammed, Dilveen Waheed. "Mechanical and electro-mechanical reliability of transparent oxide thin films for flexible electronics applications." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7997/.

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Flexible electronic devices such as solar cells, touch panels and wearable displays have developed industrially and commercially in recent years because they are flexible and light weight at low cost. Since such devices constitute a brittle oxide layer applied to a polymer substrate, the cracking and/or film damage of the brittle inorganic coating when the device is under different mechanical and environmental loading during processing and service is one of the most important problems in the flexible electronic industry. This can lead to degradation and reduction in electrical functionality of

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21

Subotić, Ivan. "Integrated on-board battery chargers for EVs based on multiphase machines and power electronics." Thesis, Liverpool John Moores University, 2015. http://researchonline.ljmu.ac.uk/4526/.

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The concept of integration of an electric vehicle (EV) drivetrain’s components into the charging process is not novel. It has been considered over the years in both industry and academia, which resulted in a number of published papers and patents in this area. Possibilities of charging from single-phase and three-phase mains were both considered. In the former group the charging power rating cannot exceed the limit set by the single-phase mains. Therefore, the topologies are characterised with low charging powers, leading to a long duration of the charging process. Although the topologies supp

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22

Roy, Scott Allen. "Simulation tools for the analysis of single electronic systems." Thesis, University of Glasgow, 1994. http://theses.gla.ac.uk/7655/.

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Developments in theory and experiment have raised the prospect of an electronic technology based on the discrete nature of electron tunnelling through a potential barrier. This thesis deals with novel design and analysis tools developed to study such systems. Possible devices include those constructed from ultrasmall normal tunnelling junctions. These exhibit charging effects including the Coulomb blockade and correlated electron tunnelling. They allow transistor-like control of the transfer of single carriers, and present the prospect of digital systems operating at the information theoretic

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23

Al-Jassani, ban Adil. "Computer aided synthesis and optimisation of electronic logic circuits." Thesis, Edinburgh Napier University, 2011. http://researchrepository.napier.ac.uk/Output/6658.

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In this thesis, a variety of algorithms for synthesis and optimisation of combinational and sequential logic circuits are developed. These algorithms could be part of new commercial EGAD package for future VLSI digital designs. The results show that considerable saving in components can be achieved resulting in simpler designs that are smaller, cheaper, consume less power and easier to test. The purpose of generating different sets of coefficients related to Reed Muller (RM) is that they contain different number of terms; therefore the minimum one can be selected to design the circuits with re

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24

Usgaocar, Ashwin R. "Integration of electrodeposited PdNi alloys with silicon and carbon nanotube electronics." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/183127/.

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This thesis investigates the electrodeposition of PdNi films with controllable composition and their suitability as electrical contacts in electronic and spintronic devices based on Silicon and Carbon nanotubes (CNTs). The electrodeposition process and characterisation of the electrical and magnetic properties of the deposited PdNi films are described. PdNi films with a wide composition range can be deposited from the same bath by changing the deposition potential. Electrical characterisation shows the formation of high quality PdNi-Si Schottky barriers while magnetic measurements prove the fe

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25

Mohammad, Naim Nur Nafisah. "Modelling the ageing behaviour of supercapacitors using electrochemical impedance spectroscopy for dynamic applications." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/29169/.

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Diagnosis of ageing mechanisms in supercapacitors is made difficult by the enforcement of various ageing factors in the current ageing tests. The thesis presents the exact determination of the ageing mechanism by separating the impacts of high temperature, current cycling and constant voltage applications in accelerated ageing tests. The state of health (SOH) of the supercapacitors are monitored periodically with electrochemical impedance spectroscopy, cyclic voltammetry and constant current test to observe the evolution of ageing. The thesis identifies patterns of ageing from the changes at s

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26

Farron, Victoria Jane. "Effects of microstructure and strain ageing on toughness of nuclear PWR reactor weld metals." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1114/.

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The effects of microstructure and prestraining and ageing on ductile-to-brittle transition temperature, fracture toughness and cleavage fracture resistance of a multi-pass low-alloy ferritic steel weld metal have been investigated. The weld metal simulated submerged arc welds used in the fabrication of Sizewell B power station reactor pressure vessel. The study aimed to investigate differences in mechanical properties of a single microstructure; asdeposited and reheated microstructures and subjected to various mechanical tests. Additionally, to simulate the effects of irradiation embrittlement

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27

Baum, Keith Warren 1959. "ESD effects on the radiation response of low power vertical DMOS N-channel transistors." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277850.

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The effect of non-catastrophic human body model positive electrostatic discharge pulses on the radiation response of low power VDMOS N-channel transistors is explored. The effect of multiple pulses of HBM ESD is to cause a change in threshold-voltage shifts between stressed and non-stressed devices when exposed to Co₆₀ gamma radiation. This difference is due to the build-up of a space charge region next to the Si/SiO₂ interface. This space charge region reduces the net electric field across the gate oxide when biased with a positive voltage and thus reduces the formation of holes and interface

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28

Phophongviwat, Teeraphon. "Investigation of the influence of magnetostriction and magnetic forces on transformer core noise and vibration." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/56199/.

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Transformer noise is of increasing environmental concern so continued efforts are being made by electrical steel and transformer producers to satisfy users by reducing the noise. Magnetostriction and magnetic forces are the main causes of transformer core noise and vibration. Understanding of the relationship from the core material to core structure and core vibration to core noise can help the design of low noise transformer cores. The most appropriate parameter for investigating the relationship between noise and vibration is sound pressure (in the unit of Pascals) in the frequency domain be

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29

Moore, Ian F. "Inertial response from wind turbines." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/42939/.

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Wind power is an essential part of the strategy to address challenges facing the energy sector. Operation of the electricity network in 2020 will require higher levels of response and reserve from generation. The provision of inertial response from wind turbines was investigated. A model was developed for the simulation of frequency on the mainland UK system, including a simplified model for a synchronous generator to represent Full Power Converter turbines. Two different methods of inertia response, the step method and the inertia coupling method, were modelled and introduced into the turbine

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30

Kamarudin, Muhammad. "Experimental investigation of CF3I-CO2 gas mixtures on the breakdown characteristics in uniform and nonuniform field configurations." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/53521/.

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This thesis is concerned with the investigation of trifluoroiodomethane (CF3I) gas mixtures as an alternative for an insulation medium in high voltage applications. The work has involved a broad review of literature, followed by developing a test rig for carrying out experimental investigations, extensive computational modelling and simulation studies as well as extensive laboratory tests on CF3I gas and its gas mixtures. The literature survey reviewed the current trend of efforts taken by researchers to find solutions for minimizing the usage of sulphur hexafluoride (SF6) as a gas insulator,

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31

Balehosur, Manjunath. "Prediction of no-load losses of stacked 3-phase, 3-limb transformer cores." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/51925/.

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The work presented in this thesis can be utilised by electrical steel manufacturers and transformer designers to design energy efficient transformer cores possessing lower life cycle costs, thereby increasing financial gains. A novel computer based algorithm to predict losses of 3-phase, 3-limb transformer cores built with high permeability grain oriented steel (HGO) and conventional grain oriented steel (CGO) is presented. The algorithm utilises parameters like transformer geometry, global flux distribution, localised loss data and material properties thus enhancing the accuracy of the predic

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32

Murad, Masoud Kheder. "Integrated high brightness array semiconductor lasers incorporating multimode interference couplers." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/4591/.

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The research described work in this thesis is concerned with the development and realisation of high brightness array laser diodes operating in single spatial mode. The fabrication of the high brightness laser devices was carried out on 830 nm GaAs/AlGaAs material system. Broad area lasers were fabricated to evaluate the material quality. The material design was based on the high d/Г concept, by which the optical power is maximised prior to thermal roll-over or the catastrophic optical mirror damage (COMD). A quantum well intermixing (QWI) process was developed for integrating the non absorbin

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33

Ngu, Sze Song. "Design and control of a direct drive slotless permanent magnet alternating current generator for low speed Bristol cylinder wave device." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4746/.

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Global demand for renewable energy is at an all-time high. Renewable energy can be extracted from naturally available resources such solar, wind, tides, geothermal heat, sea waves and the others. The percentage of renewable energy in the energy resources is increasing at an ever increasing rate. While much renewable energy is large scale, it is also suitable for rural and remote areas. The challenges facing today’s renewable energy supply industry are many, especially in the wave energy field which is still underdeveloped. The number of commercialised wave energy devices is very limited and th

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Zhu, Yixuan. "High fidelity simulations of optical waveguides for optical frequency conversion and frequency combs." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30946/.

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Conventional silicon-based electronics have developed dramatically in recent years; however, their optimum integration level is reaching its limits. To meet the requirements of dealing with this explosion of data, opto-electronic integrated circuits have provided a way out. Optical waveguides are crucial components which can be applied in opto-electronic integrated circuits to achieve specific functionalities, such as frequency conversion and frequency combs. Frequency conversion offers the possibility of converting the frequency components generated by lasers to a previously inaccessible freq

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35

Viphavakit, Charusluk. "Development of gold enhanced surface plasmon resonance polymer and nanowire waveguides for optical sensing." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/20937/.

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The recent advances in nanotechnology have created the need for the development of materials and devices with unique properties, suitable for applications in related areas such as nano-electronics, nano-photonics and high sensitivity optical sensing. Nanowires are becoming good candidates for such applications, however, most of the ongoing research is still at the early stage and therefore all the effort in this field is to improve the fabrication techniques, as well as to increase the performance of such devices, by optimizing their key parameters, in order to bring them into the production l

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36

Alarefi, S. "An investigation of micro-hydro power generator characteristics." Thesis, University of Essex, 2018. http://repository.essex.ac.uk/23403/.

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Research on the electrical characteristics of hydroelectric power systems has to the author’s knowledge, not received much attention. However, renewed interest in hydropower microgeneration has created a need to understand the underlying properties. This thesis presents a pioneering empirical investigation into the electrical characteristics of micro- hydro power generators (MHPGs). An ohmic characteristic behaviour in MHPGs with constant source impedance, even with varying water flow is demonstrated for the first time. Experimental results showed variable flow correlation between the MHPGs vo

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Garibaldi, Michele. "Laser additive manufacturing of soft magnetic cores for rotating electrical machinery : materials development and part design." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52326/.

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This research work addresses the application of Additive Manufacturing (AM) technologies in novel electrical machinery. The unrivalled design freedom offered by AM has the potential to revolutionise the way rotating electrical motors are designed and manufactured. The thesis investigates the possibility offered by AM to advance the design of electrical machines for lightweight and high performance, with potential in several industrial sectors, including automotive and aerospace. In particular, we investigate how the performance of electrical motors can be improved by manufacturing the soft mag

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Kounnos, Petros. "Hierarchical control framework to exploit community energy storage for both local and system benefit." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/53275/.

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According to the legally binding target for European governments, by 2020, 15-20% of the EU`s energy consumption should be produced from renewable sources. Furthermore, according to the National Grid`s estimate for future energy scenarios in the UK, by 2035/36 (according to the "Gone Green" future scenario) annual electricity demand could potentially reach 375TWh/year with the residential consumption energy forming 33% of the total electricity demand [3]. As claimed by the same scenario, Renewable Generation (RG) will represent 53% of the installed capacity and will provide 50% of the generate

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39

Zhang, Guangcheng. "Smart energy harvesting utilizing flow-induced techniques." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/55206/.

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The flow-induced vibration is one of the most common vibrational phenomena in the ambient environment, on which the previous studies were mainly dealing with methodologies as to how to control and reduce vibrations of objects in the flow field. Facing the growing demand of the power supply of the Internet of Things (IoT) and the Wireless Sensor Network (WSN), the energy harvesting technique utilizing multifaceted dynamic effects incurred within natural water flows is a new and meaningful area worth of further research. In this thesis, two novel strategies of the flow-induced vibration energy h

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40

Panagiotou, Konstantina. "Design recommendations and sizing guidelines for small scale grid-connected decentralised energy systems." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/55365/.

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Decentralised energy systems (DES) can be seen as a promising network topology which can potentially address the 21st century energy and power challenges that the existing hierarchical, centrally controlled power grid is required to face. Comprehensive design and representation of such systems are among the many obstacles which restrict the wider spread of DES. This thesis is concerned with the feasibility and profitability of small scale grid-connected DES located in UK. A suitable design and development procedure was proposed in this study for the analytical and detailed representation of th

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41

Noori, Ahmed Sabah. "Tunable microwave filters based on dielectric split ring resonators." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8651/.

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This thesis investigates a new type of microwave tunable filter; the filter is designed based on a new type of resonator called Dielectric Split Ring Resonator (Dielectric-SRR). The new tunable filter is utilised to tune the filter bandwidth at about 2.3 GHz. This bandwidth tuning is achieved by rotating the filter resonators and without adding tuning elements such as screws or varactor diodes. In the measurement the filter resonators are rotated by hand. This thesis also investigates the new Dielectric-SRRs in term of their losses and unloaded quality factor. These new microwave resonators ar

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42

Willetts, Ben. "New considerations and approaches to the detection of overhead cables by radar." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8452/.

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This thesis reports on research into the electromagnetic backscatter from overhead power cables as this method of distributing electrical power is hazardous to aircraft flying at low-altitudes especially during periods of low visibility. The work presented intends to improve current overhead cable detection techniques by using high-resolution millimetre-wave devices which will also allow compact devices that can be practical on a variety of airborne platforms such as manned aircraft, unmanned aerial vehicles and drones. The research also presents cable measurements obtained by airborne radar d

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Hristov, Stanislav Zdravkov. "Target shadow profile reconstruction in forward scatter radar." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8061/.

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This thesis is dedicated to the matter of imaging (further explained as profile reconstruction) in Forward Scatter Radars (FSR). Firstly, an introduction to radar systems, including forward scatter radar, is made, then an introduction to the scalar theory of diffraction and principles of holography follows. The application of holographic imaging principles in the microwave domain is studied. The practical modelling of forward scatter radar target signals is made, based on the theoretical expectations and approximations outlined. Theoretical background of the imaging in FSR is made, based on pr

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De, Luca Alessandro. "Forward scatter radar : innovative configurations and studies." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8669/.

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This thesis is dedicated to the study of innovative forward scatter radar (FSR) configurations and techniques. FSR is a specific kind of bistatic radar having bistatic angle equal or close to 180 ̊. The goal of this PhD project is to investigate techniques and configurations which would improve FSR performance, making it a more appealing system. This thesis proposes an initial radar overview with deep focus on forward scatter capabilities. FSR principles, radar cross section and target signature are widely discussed. Thus, numerous innovative studies done during this PhD project are presented.

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Dinh, Duc Dang. "Millimetre-wave power sensor design." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7851/.

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This study is to maintain and extend the power standards at National Physical Laboratory (NPL) in the United Kingdom. The calibration service of microwave power sensors at high frequencies is endangered because a limited number of traceable waveguide power sensors is available at 50 GHz and above. In this thesis, the technologies of sensing microwave power in waveguides are reviewed, and the bolometric power sensor is investigated further, as its principle is suitable for the traceability requirement at NPL. The conventional design technique of bolometric sensor based on transmission line theo

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Crespo, Manuel. "Wind turbine monitoring using short-range Doppler radar." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8420/.

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This thesis summarises the research done on the feasibility of detecting and automatically classifying wind turbine faults using a short-range radar. Two main areas are included in the thesis: the theoretical and experimental analysis of wind turbine blade radar signatures in the near-field and the classification of wind turbine structural faults using machine learning algorithms. In the former, a new theoretical framework has been developed which extends the current far-field models and includes a mathematical and experimental analysis of simple flat blades as well as complex curved blades. T

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Rabbani, Muhammad Saqib. "Microstrip antenna design with improved fabrication tolerance for remote vital signs monitoring and WLAN/WPAN applications at mm-wave and THz frequencies." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8091/.

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A novel approach is introduced to design microstrip patch antennas (MPAs) with improved fabrication tolerance for highly demanded Millimetre-wave (mm-wave) (30-300GHz) and Terahertz (THz) (0.3-3THz) frequency applications. The presented MP A designing method overcomes the challenges which exist with the fabrication and implementation of the conventional MP A designs at mm-wave and THz frequencies. The following research contributions have been added to the state-ofthe- art work: (i) designing of improved size MPAs at 60GHz, 1 OOGHz, 635GHz and 835GHz to prove the designing concept, (ii) detail

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Tzagkas, Dimitrios. "Coherent change detection with GNSS-based SAR : experimental study." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8337/.

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Bistatic Synthetic Aperture Radar (BSAR) systems are under an increasing amount of research activity over the last years. The possibility of the use of transmitters of opportunity has increased the flexibility and the applications of radar systems. One of the options is the use of Global Navigation Satellite Systems (GNSS) as transmitters, such as GPS, GLONASS or the forthcoming Galileo and Beidou, that is used in this study. This thesis is the result of the study of a GNSS-based SAR used for detection of changes that may occur in a scene. Although passive SAR is outclassed by active SAR in te

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Bai, Linxue. "Speech analysis using very low-dimensional bottleneck features and phone-class dependent neural networks." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8137/.

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The first part of this thesis focuses on very low-dimensional bottleneck features (BNFs), extracted from deep neural networks (DNNs) for speech analysis and recognition. Very low-dimensional BNFs are analysed in terms of their capability of representing speech and their suitability for modelling speech dynamics. Nine-dimensional BNFs obtained from a phone discrimination DNN are shown to give comparable phone recognition accuracy to 39-dimensional MFCCs, and an average of 34% higher phone recognition accuracy than formant-based features of the same dimensions. They also preserve the trajectory

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Belschner, Jakob. "Scheduling heuristic for reduced complexity of coordinated beamforming in large multi-carrier heterogeneous wireless networks." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/21606/.

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The research and development of wireless communication systems is often based on relatively simple models of the network topology, the radio channel and the radio propagation. This is considered to be mostly appropriate, as only under these conditions the complex technical problems in this field can be fully solved to their theoretical boundaries. However, it can also be the case that algorithms or concepts created under simplified assumptions perform in a significantly different way, when they are applied in more realistic scenarios. This Thesis presents research work which can be seen as a s

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