Browsing Electronic Theses and Dissertations by Department "Physics"
Now showing items 41-60 of 200
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(2014-04-27)Department: PhysicsThe systematic investigation of susceptibility-induced contrast in MRI is important to improve our understanding of the influence of tissue microstructure on dynamic susceptibility contrast (DSC)-MRI derived perfusion data. ...
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(2013-12-13)Department: PhysicsDensity functional theory (DFT) is a landmark development in theoretical condensed matter physics that continues to be a powerful tool for exploring the behavior and properties of matter at the atomic scale. My work has ...
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(2012-07-11)Department: PhysicsProteins, as intrinsically flexible molecules, exhibit internal motions at equilibrium. In general, the internal motions consist of changes in the three dimensional coordinates of the constituent atoms. These motions are ...
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(2017-03-28)Department: PhysicsUltra high energy cosmic rays (UHECRs) are accelerated by the most energetic processes in the universe. Upon entering Earth’s atmosphere they produce particle showers known as extensive air showers (EASs). Observatories ...
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(2012-03-25)Department: PhysicsThe last decade has transformed the field of cosmology into a precision science. We now know to great accuracy that the matter content of the Universe consists of approximately 85% in the form of the mysterious dark matter ...
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(2012-07-26)Department: PhysicsI present proof-of-principle applications of time-dependent coupled-cluster theory in the framework of nuclear physics, demonstrating that both energy and observables that commute with the Hamiltonian are conserved within ...
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(2003-12-09)Department: PhysicsThis thesis focuses on two main topics: the reactions and dynamics of water and oxygen interstitials and the optical properties and associated relaxation mechanisms of two selected defects in amorphous SiO2. The theoretical ...
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(2012-01-23)Department: PhysicsA combination of first principles density functional calculations and aberration corrected scanning transmission electron microscopy is used to investigate a number of topical issues in condensed matter and materials ...
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(2018-03-28)Department: PhysicsDefects, the origin of disorder, can be introduced into a specimen in various ways, e.g. during either materials growth, device fabrication processes or operation in harsh environments. Determining specifics of the ...
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(2014-08-01)Department: PhysicsMolecular imaging is an important tool in both clinical and pre-clinical settings. Single Photon Emission Computed Tomography (SPECT) is a molecular imaging technique provides important information for everything from ...
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Development and Characterization of NMR and MRI Methods for Assessment of Tumor Oxygen Consumption (2012-10-08)Department: PhysicsA common feature of invasive cancers is that they have an upregulation of glucose metabolism and reduced oxygen utilization. The overall goal of this research was to develop a 17Oxygen MRI method to access this aberrant ...
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Development of a new model-based radiation dose calculation algorithm for kilovoltage energy x-rays (2013-07-15)Department: PhysicsKilovoltage energy x-rays have long been used in medicine. With the rapid increase in use of x-ray imaging for diagnostics and for imaging guidance during radiotherapy there is an increased interest in determining the ...
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(2020-11-17)Department: PhysicsPHYSICS Development of a scintillation-based CMOS Quantitative Autoradiography imager for Safeguard Applications Ardelia Michelle Clarke Dissertation under the direction of Professor Todd Peterson This dissertation ...
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(2018-10-30)Department: PhysicsOver the last few decades the capabilities of atomic-resolution imaging techniques such as Scanning-Transmission-Electron-Microscopy (STEM) have greatly increased. The data acquisition rate of modern of atomic-resolution ...
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(2009-03-12)Department: PhysicsThe primary purpose of this thesis is to detail recent progress in the development of high-brightness cathodes for use in beam driven radiation sources. In particular, diamond field-emitter arrays (DFEA) are discussed and ...
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(2010-04-12)Department: PhysicsSiliSPECT, a multi-pinhole, multi-detector SPECT system, was designed to image targeted regions of rodents at sub-300 micron resolution with stationary data acquisition. High spatial resolution is achieved with thick silicon ...
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(2020-03-26)Department: PhysicsAs demand for technology with more power in smaller form factors continues to rise, meta-optics provide a unique solution for ultra-compact and customizable performance where naturally occurring materials cannot. In order ...
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(2008-11-06)Department: PhysicsDiffusion-weighted magnetic resonance imaging (DWI) provides a unique approach for probing the microstructure of biological tissues and is an important tool for both clinical and research applications, such as for the ...
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(2007-09-17)Department: PhysicsThis project consisted of the implementation of time-dependent density functional theory (TDDFT) in an electronic-structure code and the application of this code to study the dynamics of atoms, molecules and solids in the ...
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(2015-03-26)Department: PhysicsWe study the structure and evolution of dark matter halos from z = 300 to z = 6 for two cosmological N-body simulation initialization techniques. While the second-order Lagrangian perturbation theory (2LPT) and the ...