Browsing Physics, Engineering Physics and Astronomy, Department of by Title
Now showing items 171-190 of 260
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Persistent currents in bosonic mixtures in the ring geometry
(2012-03-28)The present thesis is devoted to an analysis of the possibility of Bose condensates supporting persistent currents in the ring geometry. Our analysis is based on an approach developed by F. Bloch which focuses on the ... -
Perylene Diimide Molecular Glass: Investigations of Charge Transport
(2016-08-03)A new glass-forming organic semiconductor material was synthesized using a known electron transport material, perylene diimide, and attaching it to a molecular glass in order to allow the material to be solution processed. ... -
Phase Space Structure of Disequilibrium in the Milky Way
Following Gaia Data Release 2, observations of spiral structure in the vertical phase space of the Milky Way have been made. In this thesis we set out to explain these structures, using a combination of analytic modeling, ... -
Phenomenological Studies and Analysis Techniques to Search for Light Dark Matter With NEWS-G
The NEWS-G collaboration uses gas-filled Spherical Proportional Counters (SPCs) to search for low-mass dark matter. As one of several competing collaborations pushing the low-energy frontier of particle detection technology, ... -
Phononic Crystal Surface Structures on Gallium Arsenide
A series of computational studies of surface phononic crystals on cubic gallium arsenide are explored to elucidate the behaviour of surface acoustic waves in such systems. The enhanced understanding of surface acoustic ... -
Phononic Crystal Waveguiding in GaAs
(2013-11-29)Compared to the much more common photonic crystals that are used to manipulate light, phononic crystals (PnCs) with inclusions in a lattice can be used to manipulate sound. While trying to propagate in a periodically ... -
Photoinduction of spontaneous surface relief gratings on Azo DR1 Glass
(Optics Letters 41, 2958-2961 (2016), 2016-06-23)Surface relief gratings were spontaneously photoinduced from a collimated Nd:YAG laser beam at 532 nm on thin films of a disperse red 1 functionalized glass-forming compound. Pattern formation was studied by measuring the ... -
Physical properties of a complete volume-limited sample of Ap/Bp stars: Magnetic. rotational, multiplicity, and evolutionary properties of magnetic intermediate-mass stars within 100 pc of the sun
(2007-09-27)The population of all magnetic chemically peculiar stars (Ap stars) within 100 parsecs of the sun has been identified and investigated, determining fundamental parameters, rotational properties, and magnetic field ... -
The PICO Dark Matter Search: Reflections and Projections
Dark matter remains one of the most intriguing mysteries of modern physics, and has sparked numerous experimental efforts to uncover its particle nature. Direct detection experiments using low threshold detectors in clean, ... -
The PICO-2L program: Towards Background-Free Dark Matter Direct Detection Using Bubble Chambers
The PICO-2L program commenced in 2013 with the deployment of a 2 litre bubble chamber filled with superheated C3F8 and over the next three years, conducted two separate WIMP-search experiments. The first run was conducted ... -
Polarimeter for an Accelerated Spheromak
(2014-05-01)A three-beam heterodyne polarimeter has been designed and constructed to measure line-integrated density and Faraday rotation of accelerated spheromak plasmas in the Plasma Injector 1 and 2 devices (PI-1, PI-2) at General ... -
Polymer Electrochemical Light-Emitting Devices and Photovoltaic Cells
(2009-12-14)Light-emitting electrochemical cells (LECs) are solid state polymer devices operating through the formation of a light-emitting p-n junction by in situ electrochemical doping. The LEC film contains a luminescent polymer ... -
Polymer Light-Emitting Electrochemical Cells with Embedded Bipolar Electrodes: Visualizing Bipolar Electrochemistry in Solid State
(2016-10-17)The work presented in this thesis examines the properties of BPEs of various configurations and under different operating conditions in a large planar LEC system. Detailed analysis of time-lapsed fluorescence images allows ... -
Probing Molecular Dynamics with Non-Linear Optical Techniques
(2011-09-01)The dynamics of molecules in the gas and liquid phase is investigated using ultrafast optical techniques. The development of sub-25 fs ultrafast sources using noncollinear optical parametric amplification is discussed. ... -
Process Monitoring and Defect Detection of Additive Manufacturing Using Inline Coherent Imaging
(2016-10-05)With applications ranging from aerospace to biomedicine, additive manufacturing (AM) has been revolutionizing the manufacturing industry. The ability of additive techniques, such as selective laser melting (SLM), to create ... -
Progress Towards the Quantum Limit: High and Low Frequency Measurements of Nanoscale Structures
(2010-03-02)In this thesis, I present the work performed towards a proposal to couple a piezoelectric, nanomechanical beam to a radio frequency single electron transistor (RF-SET). Lumped element RF circuit theory is applied to 50 ... -
Promoting equity in introductory physics: An identity perspective on learning physics and learning to teach
(2013-08-23)If the goal of teaching introductory physics is to help every student have successful learning experiences, then we need to answer at least two key questions to achieve this goal. First, what instructional strategies will ... -
Pulse shape discrimination studies in liquid argon for the DEAP-1 detector
(2008-04-25)A detector with a target mass of 7 kg of liquid argon was designed, constructed and operated at Queen’s University. This detector is a scaled model for the DEAP project toward a tonne-scale argon detector to search for the ... -
Pulsed Eddy Current Inspection of Broach Support Plates in Steam Generators
(2015-10-06)Steam Generators (SGs) are a critical component of nuclear reactors, employing thousands of SG tubes to convert heat generated in the reactor core into useable energy. SG tubes are supported at numerous locations by Broach ... -
Quantitative Characterization of Nanovoids in Quenched Aluminum Using Small Angle X-ray Scattering Studies
(2011-10-14)A small angle X-ray scattering (SAXS) study of quenched-in nanovoids in 99.988 and 99.995 at.% aluminum (Al) is presented. Nanovoids are agglomerations of point defects (vacancies) in the metallic host. SAXS is a ...