Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 38 for “"Physics--Theory"”.
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Strategies adopted by undergraduate physics students when modelling solutions to hands-on tasks
… a focus on the role of models and modelling in physics education. At the same time, there has also been a move away from the use of recipe-style tasks in physics laboratories to inquiry-based problem solving. From the ensuing research, model-based views of physics have emerged which have …
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Prediction of velocity distribution from the statistics of pore structure in 3D porous media via high-fidelity pore-scale simulation
… without an underlying mechanistic or statistical physics theory. Here, we investigate the relationship between the structure of the host medium and the resulting fluid flow in random dense spherical packs. We simulate flow at low Reynolds numbers by solving the Stokes equations with the finite …
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Direct Computation of the Degree 4 Gopakumar -Vafa Invariant on a Calabi -Yau 3 -Fold
… verifying an instance of conjecture motivated by physics.
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Dynamics of UV -Excited Uracil, Thymine, and Cytosine
The excited state dynamics of nucleic acids has been a subject of much experimental and theoretical interest. Nucleic acid bases readily absorb UV radiation, which can lead to mutagenic dimer formation. The dynamics of UV-excited nucleic acids is an important step in understanding how these dimers …
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An Investigation of Flow-Limited Field-Injection Electrostatic Spraying (Ffess) and Its Applications to Thin Film Deposition
Deposition of TiO2 and silver thin films using multi jet FFESS is studied, demonstrating great control on film morphology and properties. TiO2 thin films deposited on high-intensity discharge arc lamps are found to improve the quality of its light output. Silver thin films of high purity and …
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Numerical MHD Simulations in Dynamical Spacetimes
Numerical relativity probes some of the most energetic events in the universe using computer simulations. These simulations must account for the relevant physical processes while, at the same time, evolving the spacetime according to Einstein's equations of general relativity. In particular, …
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Conformal Field Theory Descriptions of String Initial Conditions and Quantum Entanglement Entropy
Quantum theories are filled with predictions which defy any classical analog. Perhaps the phenomenon which is most bizarre from a classical perspective is entanglement. This effect is the driving force behind the growing interest in quantum information. From entanglement, one is naturally led to …
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Aspects of Topological Sigma Models
The main results summarized in this thesis are contained in part two. We describe an algorithm to compute correlation functions in the topological subsector of certain N = (0, 2) nonlinear sigma models1 is. Additionally, A-twisted Landau-Ginzburg models---twisted nonlinear sigma models with …
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Neutrinos as Windows Into Physics Beyond the Standard Model
… for extending the Standard Model of Particle Physics, based on phenomenological considerations. We focus particularly on the role of neutrino data, proton decay bounds and known fermion masses and mixing angles in constraining a viable model. First, we discuss the symmetry structure necessary …
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Studies of Topology and Order in Frustrated Spin Systems
The main focus of this dissertation is the interplay between topology and order in frustrated quantum spin systems. We identify the relevant effects in the study of novel phases of matter, as they emerge in tractable quantum spin models, and we make several original contributions. In this …
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Resonant Forcing of Nonlinear Systems
We include the additional constraint that only select degrees of freedom be forced, corresponding to a very general class of problems in which not all of the degrees of freedom in an experimental system are accessible to forcing. We find that certain Lagrange multipliers take on a fundamental …
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Noisy Transport in Reaction-Diffusion Systems With Quenched Disorder
… drawn from disparate sources, including the theory of hopping conduction in doped semiconductors and first passage percolation. These tools will allow for predictions to be made for a number of important transport-related features: the infection time, or time needed for the population to …
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The Nonisothermal Stage of Magnetic Star Formation
We follow the formation and subsequent evolution of fragments (or cores) in magnetically-supported, self-gravitating molecular clouds in two spatial dimensions. The six-fluid (neutrals, electrons, molecular and atomic ions, positively-charged, negatively-charged, and neutral grains) physical system …
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Migration Towards Periodicity in Systems With Feedback
We study adaptation to the edge of chaos in dynamical systems as caused by feedback mechanisms between the state variables and the parameters. We begin by examining a system know for exhibiting chaotic dynamics and then move on to a spatially extended system. First, we study the effect of low-pass …
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Applicability of rock physics models in conjunction with seismic inverted data to characterize a low poro-perm gas-bearing sandstone reservoir for well location optimization, Bredasdorp Basin, SA
… dissertation is to develop a predictive rock physics theory that establishes relations between rock properties and the observed seismic and to present the results of different seismic characterization techniques to interpret a tight gas sand reservoir off the south coast of South Africa using …
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Data Interpretation and Management for an Atmospheric Probe Mission to Venus
… described by Mie scattering [Mie, 1908], the physics theory underpinning the AFN, holds that light scattering for a small solid angle is fundamentally degenerate: different combinations of refractive index and particle size can lead to identical light scattering. This degeneracy limits …
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Quantum Resource Theories for Thermodynamics, Reference Frames, and Uncertainty
… information science is at the interface of physics and information theory, with applications including quantum computing and communication. Within this science, a resource theory is a detailed study of a particular class of physical processes, under which the possible state transitions are …
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From Shadows to Hotspots: Imaging of Inner Protoplanetary Disc Structure
… observational constraints that advance both disc physics theory and planet formation models. Using CHARA/MIRC-X and VLTI/PIONIER data, I present my published paper with the first well-resolved characterisation of the innermost disc around the T Tauri star HD 143006. The outer disc is known to have …
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Modeling and Design of Betavoltaic Batteries
… transport codes consider the comprehensive physics theory for electron transport in materials. They are used to estimate the energy deposition and the penetration depth of beta particles in the semiconductors. A full energy spectrum was used in the model to take into account the actual …
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Searches for New Physics at the Large Hadron Collider
… not only in both experimental and theoretical physics, but also in advanced machine learning techniques that have proven successful in recent years. This thesis provides a pedagogical overview of particle physics analyses at the Large Hadron Collider, including both tried-and-true supervised …
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