Browsing Physics, Engineering Physics and Astronomy, Department of by Title
Now showing items 1-20 of 200
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Characterization of a carbon radon filter and Radon detection
(2008-09-04)Carbon filled columns were built and tested as prototype radon filters. The length of time taken for a pulse of radon to travel from one end of the filter to the other was measured using nitrogen, and then air as the ... -
Characterization Of Large Area Avalanche Photodiodes For The Measurement Of The Electron Capture Decay Of 40K To The Ground State Of 40Ar
The branching ratio of the direct decay of 40K to the ground state of 40Ar through electron capture has never been experimentally measured. This rate has been shown to be vital in constraining the DAMA/LIBRA (DArk MAtter/Large ... -
Characterization of Pulse–Shape Discrimination for Background Reduction in the DEAP-1 Detector
(2009-02-02)DEAP (Dark Matter Experiment with Argon and Pulse Shape Discrimination) is an experiment that aims to directly detect dark matter particles via nuclear recoils in liquid argon. The experiment uses the scintillation ... -
Characterization of the Galactic White Dwarf Population in the Next Generation Virgo Cluster Survey
(2016-08-08)Halo white dwarfs remain one of the least studied stellar populations in the Milky Way because of their faint luminosities. Recent work has uncovered a population of hot white dwarfs which are thought to be remnants of ... -
Charge Density Waves and Electronic Nematicity in the Three Band Model of Cuprate Superconductors
(2014-09-09)Cuprate superconductors exhibit very high critical temperatures, $T_c$, compared to those in the conventional superconductors. The doping at which $T_c$ is maximized is called optimal doping. Below this level, in the ... -
Classical and Quantum Optical Properties of Slow Light Photonic Crystal Waveguides
(2009-09-03)Photonic crystals are optical materials where patterning of dielectrics on sub-wavelength length scales creates unusual optical properties such as waveguides with propagation speeds much slower than the vacuum speed of ...