Browsing Physics, Engineering Physics and Astronomy, Department of by Title
Now showing items 188-207 of 258
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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 ... -
Quantum Nonlinear Optics in Lossy Coupled-Cavities in Photonic Crystal Slabs
(2015-06-02)A general formalism is developed that can be used to obtain photon dynamics in coupled-cavity system in leaky photonic crystal slabs. This is accomplished using a non-Hermitian projection operator, where the coupled-cavity ... -
Quantum Optics and the Quantum Jump Technique for Lossy and Non-Orthogonal Systems
(2013-09-28)In this thesis I develop a formalism for analyzing quantum optics in photonic crystal slab cavities which may be coupled, lossy, and non-orthogonal. Using a tight-binding approximation I find classical coupled-cavity ... -
The Quenching of Cluster Galaxies
In this thesis we present two projects investigating the evolution and quenching of cluster galaxy star formation (SF) activity. Leveraging a sample of 36 galaxy clusters, we measure the level of member SF activity. Over ... -
Radiopurity measurement of acrylic for the DEAP-3600 dark matter experiment
(2014-01-16)The liquid argon target of the DEAP-3600 dark matter detector is contained by an extremely radiopure acrylic vessel. Alpha decays from the inner surface of the acrylic vessel are a source of background. If a fraction of ... -
Radioreduction and Radiopurity of Acrylic in the DEAP-3600 Dark Matter Experiment
The DEAP-3600 experiment is a single-phase liquid argon dark matter detector employing pulse discrimination to mitigate background-like events and isolate WIMP-like events. The vessel that holds 3600~kg of target, and the ... -
Radon Background Reduction in DEAP-1 and DEAP-3600
(2011-01-10)The Dark Matter Experiment with Liquid Argon Using Pulse Shape Discrim- ination (DEAP) is a dark matter experiment based in the SNOLAB facility in Sudbury, Ontario. Its aim is to detect WIMPs, Weakly Interacting Massive ... -
The Rayleigh ratio measurement for SNO+ liquid scintillator and background studies of the internal ropes
(2012-09-10)As a successor of the Sudbury Neutrino Observatory, the SNO+ experiment is planned to start data taking in early 2013. Making use of the liquid scintillator, Linear Alkylbenzene (LAB), the SNO+ experiment aims to perform ... -
Rejecting Outer Radius Backgrounds in SuperCDMS High Voltage Dark Matter Searches
SuperCDMS searches for Dark Matter in the form of WIMPs. SuperCDMS is able to reject most common background events by discriminating between electron and nuclear recoils. In the CDMS low ionization threshold experiment ... -
Reversible Light-Induced Solubility of Disperse Red 1 Dye in a Hydroxypropyl cellulose Matrix
(Springer, 2018-01-29)We present results on reversible light-induced solubility of disperse red 1 (DR1) dye in a hydroxypropyl cellulose (HPC) matrix. The samples were prepared by dissolution of both DR1 and HPC in acetone and left to dry ... -
Riding the waves: The formation and evolution of vertical bending waves in Milky Way-like disc galaxies
In this thesis we study the dynamics of vertical (bending) waves in Milky Way-like disc galaxies. The main goals of the thesis are to form a coherent picture for the formation and evolution of bending waves using ... -
Robust Signal Extraction Methods and Monte Carlo Sensitivity Studies for the Sudbury Neutrino Observatory and SNO+ Experiments
(2009-09-15)The third and final phase of the Sudbury Neutrino Observatory (SNO) experiment utilized a series of 3He proportional counters called Neutral Current Detectors (NCDs) to detect the neutrons produced by the neutral current ... -
The Role of Cobalt-60 Source in Intensity Modulated Radiation Therapy: From Modeling Finite Sources to Treatment Planning and Conformal Dose Delivery
(2013-08-23)Cobalt-60 (Co-60) units played an integral role in radiation therapy from the mid-1950s to the 1970s. Although they continue to be used to treat cancer in some parts of the world, their role has been significantly reduced ... -
The role of surface fossil magnetic fields in massive star evolution
Models describing the evolution of massive stars have advanced significantly due to understanding and including key physical phenomena in the calculations, such as mass loss and rotation. As stellar magnetometry has ... -
The Rotational Evolution and Magnetospheric Emission of the Magnetic Early B-type Stars
(2016-08-05)How do the magnetic fields of massive stars evolve over time? Are their gyrochronological ages consistent with ages inferred from evolutionary tracks? Why do most stars predicted to host Centrifugal Magnetospheres (CMs) ... -
Salt-Doped Polymer Light-Emitting Devices
(2013-12-04)Polymer Light-Emitting Electrochemical Cells (PLECs) are solid state devices based on the in situ electrochemical doping of the luminescent polymer and the formation of a p-n junction where light is emitted upon the ... -
Scaling and Optimization of Polymer Bulk Homojunction Light-Emitting and Photovoltaic Cells
(2008-09-15)The polymer light-emitting electrochemical cell (LEC) is an alternative method for producing electroluminescence (EL) from conjugated luminescent polymers. The in situ electrochemical doping process that leads to a dynamic ... -
Scanning Optical Imaging and Stress Tests of Polymer Light-Emitting Electrochemical Cells
Polymer light-emitting electrochemical cells (PLECs) were tested by means of bias stress, luminescent imaging and optical scanning probing. These cells were characterized in terms of the effect of doping on the operational ... -
Scanning Photocurrent and Photoluminescence Imaging of Frozen Polymer Light Emitting Electrochemical Cells
(2013-05-29)A polymer light-emitting electrochemical cell (LEC) is a solid-state polymer device operating according to in situ electrochemical doping and the formation of a light-emitting polymer p-n junction. This operating mechanism, ... -
Scanning Tunneling Microscopy Studies of Small Aromatic Molecules on Semiconductor Surfaces
(2012-07-18)Understanding the behaviour of molecules on a semiconductor surface is necessary if molecular self-assembly is going to be employed, with existing semiconductor technology, to create useful devices. Si(111)-7x7 is an ...