Browsing Physics, Engineering Physics and Astronomy, Department of by Publish Date
Now showing items 1-20 of 256
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Fabrication and DC characterization of single electron transistors at low temperature
(2007-08-02)The metallic single electron transistor (SET) has been shown to provide charge sensitivity on the order of 10-6 e/(Hz)1/2, when operated as a charge amplifier. This makes it an ideal candidate for low-noise measurement ... -
A numerical study of galaxy mass density profiles
(2007-08-02)An understanding of the shape and nature of galaxy density profiles remains a major challenge to galaxy structure studies. The physical mechanisms thought to control these profiles include star formation rates and dynamical ... -
The surface brightness distribution of Virgo cluster galaxies
(2007-08-22)We have acquired near-IR H and optical $g$,$r$,$i$,$z$ imaging for a sample of 299 Virgo cluster galaxies down to a limiting magnitude of B$_T$=16.0 mag. The low sensitivity of near-IR wavelengths to dust extinction is ... -
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 ... -
Simulations of planet migration driven by the scattering of smaller bodies
(2007-09-17)Planet migration is an important part of the formation of planetary systems, both in the Solar system and in extrasolar systems. When a planet scatters nearby comet- and asteroid-size bodies called planetesimals, a significant ... -
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 ... -
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 ... -
Dust Dynamics in the Galactic Disk-Halo Vicinity
(2007-09-27)We report on the dynamics of interstellar dust grains above the plane of the Milky Way. Our Galactic model closely matches its large-scale observed properties, namely the luminosity output, the gas content and distribution, ... -
Design, fabrication and characterization of a suspended heterostructure
(2007-09-28)This thesis presents the design and theoretical modeling of an aluminum gallium arsenide/gallium arsenide heterostructure from which suspended nanoscale mechanical resonators with embedded two-dimensional electron gas ... -
Development of Optoelectronic Devices and Computational Tools for the Production and Manipulation of Heavy Rydberg Systems
(2007-10-26)Experimental and theoretical progress has been made toward the production and manipulation of novel atomic and molecular states. The design, construction and characterization of a driver for an acousto-optic modulator is ... -
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 ... -
Study of a non-interacting, nonuniform electron gas in two dimensions
(2007-11-08)The non-interacting, nonuniform electron gas exhibits simplifications in two dimensions, that are of particular interest in the application of density functional theory. The results of linear response theory for an attractive ... -
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 ... -
Silicon complexes in silicon doped calcium phosphate biomaterials
(2008-01-03)The silicon complexes in silicon doped calcium phosphate bioceramics have been studied using $^{29}$Si magic angle spinning nuclear magnetic resonance spectroscopy. The replacement of phosphorus by silicon in these materials ... -
Time-Gated Fourier-Domain Optical Coherence Tomography
(2008-01-16)Optical coherence tomography (OCT) has been shown to be a versatile three-dimensional imaging tool in diagnostic medicine, combining micrometre-scale resolutions with fast acquisition times. This imaging modality uses the ... -
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 ... -
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 ... -
Conformal Radiation Therapy with Cobalt-60 Tomotherapy
(2008-04-28)Intensity-modulated radiation therapy (IMRT) is an advanced mode of high- precision radiation therapy that utilizes computer-controlled x-ray accelerators to deliver precise radiation doses to malignant tumors. The ... -
Temperature control instrumentation for scanning tunnelling microscopy
(2008-06-04)This thesis describes three different design projects that are intellectually connected by the fact that they all involve the development of apparatus to facilitate the precise control of sample temperature in modern ... -
Defining gravitational singularities in general relativity
(2008-07-22)Singularities have been a long-standing problem in general relativity. In all other fields of physics, singularities can be easily located and avoided; in general relativity, singularities have an impact on the creation ...