Browsing Physics, Engineering Physics and Astronomy, Department of by Title
Now showing items 1-20 of 287
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Ab initio Studies of Indium Clustering on the Ge(111)-5x5 Surface
(2007-10-29)This thesis reports an \textit{ab initio} study of the Ge(111)-5$\times$5 reconstruction, which forms on top of a Si(111)-7$\times$7 substrate. Detailed descriptions of the structural and electronic properties of ... -
Ablation of Steel by Microsecond Pulse Trains
(2016-08-09)Laser micromachining is an important material processing technique used in industry and medicine to produce parts with high precision. Control of the material removal process is imperative to obtain the desired part with ... -
Alpha backgrounds in the DEAP dark matter search experiment.
(2012-08-10)One of the pressing concerns in Dark Matter detection experiments is ensuring that the potential signal from exceedingly rare Dark Matter interactions is not obscured by background from interactions with more common ... -
Analysis and Visualization of Exact Solutions to Einstein's Field Equations
(2013-10-02)Einstein's field equations are extremely difficult to solve, and when solved, the solutions are even harder to understand. In this thesis, two analysis tools are developed to explore and visualize the curvature of spacetimes. ... -
Analysis of Cosmogenic Impurities in Tellurium and Development of Tellurium Loading for the SNO+ Experiment
(2016-08-29)For the SNO+ neutrinoless double beta decay search, various backgrounds, ranging from impurities present naturally to those produced cosmogenically, must be understood and reduced. Cosmogenic backgrounds are particularly ... -
Analysis of Radio Spectral Indices in the CHANG-ES Galaxy Sample
The spectral index of a galaxy provides insight on the processes occurring within the galaxy, and can give hints to how the cosmic ray electrons propagate through the galaxy. Band-to-band spectral index maps provide a ... -
An Analysis of the 3-He Proportional Counter Data from the Sudbury Neutrino Observatory Using Pulse Shape Discrimination
(2009-09-22)This thesis presents an independent analysis of the data from 3-He-filled proportional counters from the third phase of the Sudbury Neutrino Observatory (SNO) data. These counters were deployed in SNO's heavy water to ... -
Analytical modeling for transient probe response in eddy current testing
(2015-06-10)Analytical models that describe the electromagnetic field interactions arising between field generating and sensing coils in close proximity to conducting structures can be used to enhance analysis and information extracted ... -
The Andromeda Optical and Infrared Disk Survey
The spectral energy distributions of galaxies inform us about a galaxy’s stellar populations and interstellar medium, revealing stories of galaxy formation and evolution. How we interpret this light depends in part on our ... -
Angular Resolution and Directionality in SNO+
Solar neutrinos are an irreducible background for the SNO+ double beta decay experiment. Neutrino interactions in the SNO+ detector produce directional Cherenkov light which, if separated from the dominant scintillation ... -
Anisotropic Fluid Solutions to Einstein's Equations in Spherical Symmetry
The main objective of this thesis is to develop and investigate a class of spherically symmetric solutions to Einstein's field equations for anisotropic matter distributions. This work is partially motivated by a recent ... -
Application and Development of Algebraic Reconstruction Algorithms for High Dose Rate Brachytherapy Gel Dosimetry with Optical Computed Tomography Readout
Radiation therapy treatment techniques have become more complex to offer optimal tumour control while preserving patient quality of life by avoiding damage to healthy tissue. This increased complexity requires more thorough ... -
Atmospheric Dependence of Fractoluminescence and Phononic Emissions in Inorganic Scintillator Fractures
Background signals in particle detectors can originate from several categories of sources, including radioactivity found in the detector or its housing and cosmic radiations. High energy physics relies heavily on the use ... -
Background Measurement Techniques and Sensitivity Studies for the SNO+ Neutrinoless Double Beta Decay Search
(2016-05-30)The control of radioactive backgrounds will be key in the search for neutrinoless double beta decay at the SNO+ experiment. Several aspects of the SNO+ back-grounds have been studied. The SNO+ tellurium purification process ... -
A Barkhausen Noise Testing System for CANDU Feeder Pipes
(2009-07-22)A Barkhausen noise (BN) testing system was developed for the non-destructive evaluation (NDE) of residual stresses in CANDU reactor feeder pipes. The system consists of a four-channel arbitrary waveform flux control system ... -
A Bayesian/MCMC Approach to Galaxy Modelling: NGC 6503
(2010-01-11)We use Bayesian statistics and Markov chain Monte Carlo (MCMC) techniques to construct dynamical models for the spiral galaxy NGC 6503. The constraints include surface brightness profiles which display a Freeman Type II ... -
Bipolar Electrode Array Embedded in a Polymer Light-Emitting Electrochemical Cell
(American Chemical Society (ACS), 2017-09-20)A linear array of aluminum discs is deposited between the driving electrodes of an extremely large planar polymer light-emitting electrochemical cell (PLEC). The planar PLEC is then operated at a constant bias voltage of ... -
Branched Nanostructured Anodes For Dye-Sensitized Solar Cells
(2015-03-11)The high relative efficiency demonstrated in dye-sensitized solar cells (DSSCs) arises from a combination of light scattering within, and photo-generated electron transport through, the porous structure of a TiO2 anodes. ... -
Calibration Hardware Research and Development for SNO+
(2014-06-02)The SNO+ experiment is a kilo-tonne scale liquid scintillator detector located at SNOLAB in Sudbury, Ontario, Canada. As the successor to the Sudbury Neutrino Observatory, SNO+ will use linear alkylbenzene (LAB) as the ... -
Calibration of Infrared Photons in Cryogenic Germanium Detectors
A significant evidence from galaxies and astrophysical observations, suggests that ~ 85% of the matter in our Universe is invisible matter. The observations of the so-called “dark matter” suggest that it consists of ...