Browsing Department of Physics, Engineering Physics and Astronomy Graduate Theses by Title
Now showing items 124-143 of 255
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A Lanczos study of superconducting correlations on a honeycomb lattice
(2008-03-18)In this thesis superconducting correlations on both a one-dimensional chain and a two-dimensional honeycomb lattice are analyzed using the t-J model Hamiltonian. Both systems use periodic boundary conditions and different ... -
Laying Foundations for a Nanophotonics Research Centre and an Emergency Communications Network
An interdisciplinary collaboration at Queen's is aiming to advance the frontiers of nanophotonics through shared equipment that will be introduced to the new Nanophotonics Research Centre (NanoRC), enabling picometer- and ... -
The Limiting Background in a Detector Testing Facility for SuperCDMS at SNOLAB
(2011-02-01)SuperCDMS is the next generation of the Cryogenic Dark Matter Search experiment (CDMS), aimed at the detection of the Weakly Interacting dark matter Particles (WIMPs) with the use of phonon and ionization signals in germanium ... -
Low Energy 8B Solar Neutrinos in SNO+: Controlling and Constraining Radon Backgrounds
(2013-05-02)SNOLAB located in Sudbury, Canada, is hosting a new liquid scintillator experiment for studying neutrinos which is called SNO+. Many interesting physics topics such as measuring low energy solar neutrinos and searching ... -
Low energy solar neutrino analysis of the salt phase of the Sudbury neutrino observatory
(2008-01-02)The neutrino fluxes from the neutral current (NC), charged current (CC), and elastic scattering (ES) neutrino interactions in the salt phase of SNO have been extracted. The signals were extracted above an energy threshold ... -
Magnetic Barkhausen Noise Measurements Using Tetrapole Probe Designs
(2014-12-23)A magnetic Barkhausen noise (MBN) testing system was developed for Defence Research and Development Canada (DRDC) to perform MBN measurements on the Royal Canadian Navy’s Victoria class submarine hulls that can be correlated ... -
Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
(2015-10-03)Magnetic Barkhausen Noise emissions are discontinuous magnetization changes within ferromagnetic materials that have been subjected to changing applied magnetic fields. These emissions are sensitive to microstrutural ... -
Magnetic fields and the variable wind of the early-type supergiant β Ori
(2012-04-30)Supergiant stars of spectral types B and A are characterized by variable and structured winds, as revealed by variability of optical and ultraviolet spectral lines. Non- radial pulsations and magnetically supported loops ... -
The Magnetic Fields of Ap Stars From High Resolution Stokes IQUV Spectropolarimetry
(2014-05-28)In this thesis we describe the acquisition of high resolution time resolved spectropolarimetric observations of 7 (bright and well understood) Ap stars in Stokes IQUV using the ESPaDOnS and Narval spectropolarimeters at ... -
A Magnetic Flux Leakage NDE System for CANDU Feeder Pipes
(2010-03-11)This work examines the application of different magnetic flux leakage (MFL) inspection concepts to the non destructive evaluation (NDE) of residual (elastic) stresses in CANDU reactor feeder pipes. The stress sensitivity ... -
Magnetic, chemical and rotational properties of the Herbig Ae/Be binary system HD 72106
(2007-09-17)Recently, magnetic fields have been detected in a handful of pre-main sequence Herbig Ae and Be (HAeBe) stars. This hints at an evolutionary connection between magnetic HAeBe stars and Ap and Bp stars. Ap/Bp stars are ... -
Measurement of Cosmogenic Production Rates in Ge with CDMSlite
The majority of matter in the Universe is non-luminous, non-baryonic, and as of yet undiscovered. The SuperCDMS experiment searches for this "dark matter" in the form of Weakly Interacting Massive Particles (WIMPs), operating ... -
Measuring the Mass of a Galaxy: An evaluation of the performance of Bayesian mass estimates using statistical simulation
(2013-03-27)This research uses a Bayesian approach to study the biases that may occur when kinematic data is used to estimate the mass of a galaxy. Data is simulated from the Hernquist (1990) distribution functions (DFs) for velocity ... -
The Methodology of Modelling the Milky Way with Stellar Streams
(2014-10-01)In this thesis we examine the methodology of modelling the Milky Way using stellar streams. Using the orbit-fitting method we show that combining constraints from the Sagittarius stream with a suite of other photometric ... -
Modelling Telomere Length Dynamics Subject to the Action of Telomerase
(2016-04-30)All eukaryotic organisms, single-celled or multi-celled, have linear chromosomes, and all linear chromosomes have telomeres at their ends. All eukaryotes have genes which code for the enzyme telomerase. These entities vary ... -
A Modified Detector Concept for SuperCDMS: The HiZIP and Its Charge Performance
(2013-10-03)SuperCDMS is a leading direct dark matter search experiment which uses solid state detectors (Ge crystals) at milliKelvin temperatures to look for nuclear recoils caused by dark matter interactions in the detector. ‘Weakly ... -
Modulation of Quantum Dot Energy Levels by Surface Acoustic Waves for use as a Triggered Photon Source
(2014-10-06)The foundation for a triggered photon source was realized by convolving the energy bandgap of a quantum dot with a surface acoustic wave. The devices consisted of an InP substrate on which InAs/InP quantum dots were grown. ... -
Molecular-level study of N-heterocyclic carbenes: Binding modes and self-assembly on Au(111)
Self-assembled monolayers (SAMs) of organic molecules are extensively used to functionalize surfaces for a wide range of applications from medicine to nanophotonics. However, creating a SAM that is sufficiently stable has ... -
Monitoring Laser Material Processing by Simultaneous Inline Coherent Imaging and Integrating Sphere Radiometry
Understanding the underlying physics of laser welding and metal additive manufacturing (AM) is crucial to the advancement of laser-based manufacturing. One aspect that especially requires careful attention and control is ... -
Monitoring Material Modification using Inline Coherent Imaging
(2010-11-03)Laser machining is a commonly used method for materials processing. Focusing laser energy onto a sample can lead to material modifications and achieve feature sizes on the order of micrometres. However, designing a ...