Browsing Electronic Theses and Dissertations by Department "Physics"
Now showing items 141-160 of 200
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(2016-11-18)Department: PhysicsDetection of signals is critical for the function of eukaryotic cells. D. discoideum cells are particularly adept at responding chemical gradients, sensing single percent concentration changes across their body. We measure ...
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(2006-08-18)Department: PhysicsIn this dissertation, we applied tunable, ultra-fast lasers along with a pump-probe experimental technique to study electron and phonon dynamics. With one channel, Second Harmonic Generation can be monitored, which is a ...
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(2016-03-29)Department: PhysicsThe circumstellar environments of young stellar objects (YSOs) involve complex dynamical interactions between dust and gas that directly influence the formation of planets. However, our understanding of the evolution from ...
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(2016-04-06)Department: PhysicsBiomechanical analysis of the developing Drosophila embryo has historically focused on the role of individual cells. Cells translate genetic information into protein machinery that is capable of generating forces. With ...
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(2016-03-18)Department: PhysicsMeasurements of the spin-lattice relaxation rate in the rotating frame, R1rho, using spin-locking techniques have long been exploited to investigate relatively slow molecular motions and, more recently, to analyze chemical ...
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(2007-11-29)Department: PhysicsThis dissertation discusses magnetization transfer effects in magnetic resonance imaging and the development and applications of quantitative magnetization transfer imaging techniques. Specifically, the magnetization ...
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(2012-08-12)Department: PhysicsFirst-principles simulations of quantum transport in nano-devices are presented in this dissertation. First, the extension of the complex absorbing potential quantum transport framework to the general case of N electrodes ...
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(2012-08-06)Department: PhysicsRecent advances in radiation biology have caused a shift in focus from the classical view of direct DNA damage and repair to one that encompasses intricate cellular signaling pathways present at both the cell and tissue ...
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(2011-04-15)Department: PhysicsThe increased signal-to-noise ratio (SNR) that accompanies the use of stronger static fields in magnetic resonance imaging (MRI) has driven the use of increasingly higher fields ever since the technology's inception over ...
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(2008-08-11)Department: PhysicsResonant infrared (RIR) laser ablation of two model polymer systems is studied. A tunable free-electron laser (FEL) operating in the mid-infrared is used to resonantly excite vibrational modes of polystyrene and poly(ethylene ...
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(2015-08-21)Department: PhysicsMany novel physical phenomena and fascinating properties emerge when materials are thinned down to monolayers. For instance, graphene, the monolayer form of graphite, has zero gap, ultra-high electron mobility, massless ...
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(2014-07-22)Department: PhysicsThe accelerated expansion of the universe was discovered in 1998 through studying high–redshift Type Ia supernovae. “Dark energy” has been proposed to account for this acceleration. There have been sundry candidates for ...
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(2022-05-16)Department: PhysicsRegardless of its remarkable success, the standard model (SM) of particle physics is unable to explain experimental observations like dark matter (DM), or conceptual problems, like the hierarchy problem. Supersymmetry ...
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(2016-03-28)Department: PhysicsA first search for pair production of dark matter candidates through vector boson fusion, in proton-proton collisions at sqrt(s) = 8 TeV, is performed with the CMS detector. The vector boson fusion topology enhances missing ...
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(2024-03-18)Department: PhysicsOne primary goal of particle physics is to examine the properties of particles and the forces by which they interact. Although physicists have previously used a theoretical framework called the Standard Model (SM) to ...
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(2011-08-30)Department: PhysicsHigh-mass states such as heavy gauge bosons (Z'), Kaluza-Klein resonances, and gravitons, all of which decay into di-lepton states, are predicted by several physics models. In this thesis a general search for high mass ...
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(2023-07-18)Department: PhysicsOne of the most notable downfalls of the standard model (SM) and some of its theoretical extensions is the inability to provide a Dark Matter (DM) particle candidate with characteristics such that DM + DM ↔ SM + SM ...
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(2004-04-14)Department: Physics<font size=+1> The reaction γ p → π<sup>+</sup> K<sup>-</sup>K<sup>+</sup>n has been investigated at Jefferson Lab using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness ...
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(2020-03-26)Department: PhysicsA search for compressed supersymmetry in the stau-neutralino coannihilation region with a soft tau lepton and a high transverse momentum jet from initial state radiation (ISR) is presented. The search targets final states ...
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(2002-11-03)Department: PhysicsA tremendous effort has been devoted to finding the deep physical reason for the existence of the mass hierarchy and weak mixing among the quarks and leptons. Despite the enormous amount of data accumulated during the past ...