Browsing Physics and Astronomy by Title
Now showing items 17-36 of 45
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Higgs and Heavy Meson Lattice Spectroscopy
(2016-09-20)Lattice simulations are a first principles method of numerically studying the spectrum of bound states. In quantum chromodynamics (QCD), lattice simulations have had tremendous success in accurately calculating the hadron ... -
Impact of Saharan Dust Aerosols on Radiation and Clouds Over the Tropical East Atlantic Ocean
(2018-03-01)Aerosols affect the atmospheric processes by interacting with shortwave (SW) and longwave (LW) radiations and also by modifying the cloud microphysics (direct and indirect effects respectively). This study investigates the ... -
Investigation into the Spatial Distribution of AGN Companion Galaxies in Gravitationally Isolated Environments
(2018-11-21)Active galaxies are an important subclass of galaxies, distinguished by an energetic core driven by enhanced accretion onto a central supermassive black hole. However, this accretion mechanism inevitably opens up a problem: ... -
Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
(2019-11-22)Thermophysical properties of thin film materials are of great importance for thermal management in devices including transistors, lasers, sensors, and plasmonic structures. In this thesis, I examine the characterization ... -
Ion-Atom Collisions: A Time-Dependent Density-Functional-Theory Perspective
(2018-05-28)Time-dependent density functional theory (TDDFT) is an alternate formulation of time-dependent N-body quantum mechanics which allows one to describe a system via the single-particle density, n, rather than the full N-body ... -
Ionization of Helium in a Non Coplanar Geometry
(2016-11-25)The purpose of this work is to calculate the scattering behavior of a non-coplanar ionization collision of an electron with a helium atom. Relativistic distorted waves were used to describe the wave functions of the incident ... -
Ionization of the Hydrogen Molecular Ion by Strong Infrared Laser Fields
(2015-01-26)The ionization of simple molecular targets, such as molecular hydrogen, or even the molecular hydrogen ion ($\mbox{H}^{+}_{2}$) by strong laser fields has become the focus of experimental research in the past few decades. ... -
Laboratory Studies of Surface-Atmosphere Water Exchange Processes on Mars
(2019-03-05)The recent discoveries of highly deliquescent perchlorate salts and strongly adsorbing porous minerals on the surface of Mars are intriguing as liquid brine solutions and adsorbed water could potentially provide a habitable ... -
Lidar Measurements of Pollution Above the Canadian Oil Sands
(2018-05-28)Aircraft based lidar measurements of atmospheric aerosol and ozone were conducted to study air pollution from the oil sands extraction industry in northern Alberta. Significant amounts of aerosol were observed in the ... -
Measurement of Pion-Carbon Cross Sections at DUET and Measurement of Neutrino Oscillation Parameters at the T2K Experiment
(2018-08-27)The Tokai-to-Kamioka (T2K) experiment is a long baseline neutrino oscillation experiment. An intense muon neutrino (or antineutrino) beam is produced at the Japan Proton Accelerator Research Complex (J-PARC) by protons ... -
Modified Gravity and Cosmology on the Largest Scales
(2018-03-01)This dissertation presents a series of my contributions to research in theoretical cosmology, focusing on aspects of the very large scale universe, particularly dark energy, cosmic acceleration, modified gravity, and cosmic ... -
Monitoring Broad Absorption-Line Quasar Variability
(2016-09-20)Winds generated by an accreting super massive black hole may provide feedback to the host galaxy and offer an explanation for the co-evolution of galaxies with their super massive black holes that has been reported in the ... -
Multiscale Modelling of Molecules and Continuum Mechanics Using Bridging Scale Method
(2016-11-25)his PhD dissertation is about developing a multiscale methodology for coupling two different time/length scales in order to improve properties of new space materials. Since the traditional continuum mechanics ... -
On the Role of Projectile Electrons in an Independent Electron Model Description of Dressed-Ion Impact on Atoms
(2016-11-25)The presence of electrons on ions which collide with neutral atoms constitutes a challenge to theoretical descriptions of the collision dynamics. These collisions pose quantum-mechanical many-body problems that cannot be ... -
Photometric Calibrations of Metallicity and Temperature For M Dwarfs
(2015-08-28)Based on a carefully collected sample of dwarf stars, a new empirical photometric calibration to estimate the metallicity of late-type K and early-to-mid-type M dwarfs is presented. The calibration sample has two parts; ... -
Precision Microwave Frequency-Offset Separated-Oscillatory-Fields Measurement of the 2^3 P_1to-2^3 P_2 Fine-Structure Interval in Atomic Helium
(2019-07-02)The 2^3P_1-to-2^3P_2 fine-structure interval in atomic helium is measured using the frequency-offset separated-oscillatory-fields (FOSOF) technique. Two temporally separated microwave fields set up excitation paths that ... -
Quantum Interference Effects in Precision Spectroscopy of Helium Fine Structure
(2017-07-26)Precision spectroscopy of atomic helium fine structure provides a means of testing fundamental few-body theory as well as determining the fine-structure constant, which characterizes electromagnetic interactions in nature. ... -
Quantum-Mechanical Approach to Collision-Induced Radiative Emissions
(2018-05-28)Charge exchange is a process that occurs in an atomic collision where an electron from one of the colliding particles is transferred to the other; typically from a neutral atom or molecule to an ion. Electrons transferred ... -
Search For Magnetic Monopoles in 8 TEV Centre-of-Mass Energy Proton-Proton Collisions With the Atlas Detector at the LHC
(2016-09-20)Symmetry is fundamental to our understanding of the laws of nature. The simplicity that is found in the symmetries that explain the most fundamental interactions is remarkably beautiful. Physicists have worked hard and ... -
Semi-Empirical Modeling of Radiolytic Production in the Mars Northern Polar Region
(2016-09-20)A model to simulate the radiolytic production of various compounds in the Mars northern polar region was developed. Galactic cosmic rays are used as the source of particle radiation. Particle energy distributions are ...