Browsing Department of Physics, Engineering Physics and Astronomy Graduate Theses by Title
Now showing items 91-110 of 243
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Gamma Calibration Using A New Test Apparatus At Queen’s University And Optimization Analyses For The PICASSO Experiment
(2009-09-26)The PICASSO experiment located 2 km underground in SNOLAB is directly searching for dark matter signals by looking for interactions between dark matter particles and an active target made of superheated droplets of freon ... -
Gas Ejection from Spiral Galaxy Disks
(2012-01-06)We present the results of three proposed mechanisms for ejection of gas from a spiral arm into the halo. The mechanisms were modelled using magnetohydrodynamics (MHD) as a theoretical template. Each mechanism was run ... -
Gigahertz Modulation of a Photonic Crystal Cavity
(2013-04-30)Photonic crystal (PtC) cavities are an increasingly important way to create all optical methods to control optical data. Not only must the data be controlled, but interfacing it with high frequency electrical signals is ... -
The Globular Cluster Kinematics and Dark Matter Content of NGC 4649
(2011-10-12)The globular cluster system (GCS) of the elliptical galaxy NGC 4649 has been examined using the Gemini Multi-Object Spectrograph (GMOS); spectra for 156 candidate globular clusters (GCs) were obtained, extending to a ... -
Globular Cluster Kinematics and Dark Matter Content of the Isolated Elliptical NGC 720
(2011-02-03)We examine the globular cluster system (GCS) of the isolated elliptical NGC 720 using the Gemini Multi-Object Spectrograph (GMOS) and have obtained spectra for 241 candidate globular clusters (GCs) extending to a galactocentric ... -
A High-Speed Reconfigurable System for Ultrasound Research
(2010-12-13)Many opportunities exist in medical ultrasound research for experimenting with novel designs, both of transducers and of signal processing techniques. However any experiment must have a reliable platform on which to develop ... -
Highly Efficient Thermal Ablation of Silicon and Ablation in Other Materials
(2011-06-06)Laser micromachining has become increasing prominent in various industries given its speed, lack of tool wear, and ability to create features on the order of micrometres. Inherent stochastic variations from thermal ablation ... -
How Electrode Material Affects the Performance of Polymer Light-Emitting Electrochemical Cells
(2008-09-23)Polymer light emitting electrochemical cells (LECs) are solid-state devices containing an active layer blend of luminescent polymer, ion transport material and salt sandwiched between two electrodes. They operate on the ... -
Identification and Reduction of the Alpha Background, From 238U and 232Th Decay Chains, in the DEAP-3600 Experiment.
Different cosmological and astronomical observations from the past century indicate that non-baryonic matter, commonly referred to as dark matter, dominates the composition of the universe. Discovering the nature and ... -
Implementation and Characterization of Cone Beam Computed Tomography Using a Cobalt-60 Gamma Ray Source for Radiation Therapy Patient Localization
(2010-12-08)Cobalt 60 (Co-60) radiation therapy is a simple and reliable method of treating cancer by irradiating treatment volumes within the patient with high energy gamma rays. Medical linear accelerators (linacs) began to replace ... -
Improved Limits On The Existence Of Dark Matter. The Final Results From The PICASSO Experiment.
(2015-03-16)The final results of the PICASSO experiment, with 409 kg days of exposure collected from November 2012 to January 2014, have yielded new limits for Spin-Dependent and Spin-Independent Dark Matter interactions.\\ The ... -
In-line optical fiber interferometric refractive index sensors
(2008-08-20)With many unique advantages compared to traditional sensors, optical fiber sensors have been studied and applied to many different areas. Interferometric sensors are one of the most useful sensor types due to their high ... -
Infrared Observations of the Spiral Galaxy NGC 891
(2007-08-27)This thesis is a detailed, multi-waveband study of the inner 14 kpc of the famous spiral galaxy, NCG 891. The primary data have come from the Infrared Space Observatory's Camera. These data are images of the galaxy in 9 ... -
Inline Coherent Imaging
(2012-11-21)In laser materials processing, the direct measurement and characterization of material and process depth is traditionally a diffcult task. This is particularly difficult when such information needs to be obtained in real-time ... -
Inline Coherent Imaging Applied to Laser Micromachining
(2014-04-30)Laser processing has the advantage of minimal sample contact and thus little tool wear over time compared to conventional machining. However, this leads to the difficulty of real-time depth monitoring and control. To help ... -
Inline Coherent Imaging Based Control of Laser Machining Processes using a Field-Programmable Gate Array
(2015-10-03)Lasers are becoming an increasingly popular tool for use in industrial manufacturing settings. Their high power density, contact-free nature, and ease of automation give them an edge over traditional methods in processes ... -
Inline Coherent Imaging of Laser Additive Manufacturing
(2015-12-02)Metal-based laser additive manufacturing techniques such as selective laser melting offer unique capabilities in the manufacture of geometrically complex metal components. The ability of these techniques to fabricate unique ... -
Inline Coherent Imaging of Laser Keyhole Welding
(2015-05-01)Laser keyhole welding is an emerging materials processing technique offering many advantages over more conventional joining methods. High intensity laser light is applied to a sample, melting and evaporating the metal in ... -
Inline Temperature Imaging: A Non-contact Temperature Measurement Technique for Laser Processing
Laser keyhole welding and laser additive manufacturing are high intensity laser based advanced manufacturing techniques that offer numerous advantages over more traditional processes. However, because of the extreme spatial ... -
Inspection of Ferromagnetic Support Structures From Within Alloy 800 Steam Generator Tubes Using Pulsed Eddy Current
(2015-10-03)Nondestructive testing is a critical aspect of component lifetime management. Nuclear steam generator (SG) tubes are the thinnest barrier between irradiated primary heat transport system and the secondary heat transport ...