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.
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Showing 1 to 20 of 50 for “"Bohm"”.
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A Continuum Kinetic Investigation into the Role of Transport Physics in the Bohm Speed formulation
… with a speed equal to or greater than the `Bohm speed'. The Bohm speed is a landmark result in sheath theory and various mathematical expressions for it have been derived from fluid and kinetic treatment of plasmas. Although these models are widely used, they are only accurate in cases where …
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Properties of Type-II ZnTe/ZnSe Submonolayer Quantum Dots Studied via Excitonic Aharonov-Bohm Effect and Polarized Optical Spectroscopy
… including excitonic Aharonov-Bohm (AB) effect and polarized optical spectroscopy as the primary tools in this work.</p> <p>I present previous studies as well as the background of optical and magneto-optical processes in semiconductor nanostructures and introduce the …
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The Effects of Collisions on Plasma-Sheath Transition
… wall. The key concept in sheath theory is the Bohm criterion that gives the lower bound of the plasma exit flow speed, also known as the Bohm speed. Traditionally, the Bohm speed is evaluated in the asymptotic limit of an infinitely thin sheath and ignores the transport physics in the …
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The Theological Significance of the Relations of Freedom and Time in the Sciences and Humanities: An Evaluation of the Contributions of David Bohm and Pauli Pylkko
… the works of the philosopher of science, David Bohm and the philosopher of the humanities, Pauli Pylkkö. These two representatives come from the two competing cultures of the sciences and humanities, which illustrate the deep philosophical conflict that has emerged between these cultures …
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Bohmian Quantum Mechanics with Quantum Trajectories
… in the hydrodynamical formulation of Madelung-Bohm-Takabayasi quantum mechanics is an example of showing the cognitive importance of scientific illustrations and metaphors in computational quantum chemistry and electrical engineering. The method involves several numerical schemes of solving a …
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Complementariteit in kennistheoretisch perspectief
… authors (Bohr, Whitehead, systems theory, Bohm, Löfgren, Prigogine). Bohr explicitly formulates a theory of complementarity, combining the two ways of description. How do other authors combine their two views of reality, is the concept of complementarity here also suitable as unifying …
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On Quantum Effects of Vector Potentials and Generalizations of Functional Analysis
… in two parts. In the first one, the Aharonov-Bohm effect is investigated. It is shown that solenoids (or flux lines) can be seen as barriers for quantum charges. In particular, a charge can be trapped in a sector of a long cavity by two flux lines. Also, grids of flux lines can approximate the …
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QUANTUM TRANSPORT WITH COLD ATOMS
… fields. We show that this so-called Aharonov-Bohm effect is absent for bosonic atoms. Within atomic Y-junctions, we find negative reflections that resemble Andreev-reflections known from metal-superconductor interfaces. Further, we show that topological pumping within atomic ring systems can …
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Analysis of magnetic activity cycles in solar analogs using Solar - Stellar Spectrograph data
… cycle period - rotational period relation by Bohm-Vitense (2006), and they all lie on either the active sequence or the inactive sequence. This result, together with the fact that several stars have two different cycles lying on different sequences, lends more evidence to the hypothesis that …
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A nanofabricated amplitude-division electron interferometer in a transmission electron microscope
… and demonstration of the Aharonov-Bohm effect. However, wavefront-division interferometry is limited by the requirement of high source coherence. Amplitude-division electron interferometers, first demonstrated by Marton and co-workers in 1954, can overcome this limitation. The …
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Optical spectroscopy of single-walled carbon nanotubes in high magnetic fields
… its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and visible-NIR absorption in the Voigt geometry were measured at room temperature in …
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Mesoscopic wave phenomena in electronic and optical ring structures
… von Elektronen über einen externen Aharonov-Bohm-Fluß erlaubt. Optische mesoskopische Systeme sind Thema von Teil II dieser Arbeit. Wir betrachten zweidimensionale annulare Strukturen, charakterisiert durch unterschiedliche Brechungsindizes, sowohl im klassischen Bild der geometrischen Optik …
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Novel electromagnetic scattering phenomena
… enables us to observe the non-Abelian Aharonov-Bohm effect with classical waves and classical fluxes, relevant for classical and quantum topological phenomena.
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… measurements, and observed evidence of Aharonov-Bohm (AB) and Alâ tshuler-Aronov-Spivak (AAS) quantum oscillations in meso- scopic devices that we fabricated on these NGSs. Our measurements are unique in that we observe both AB and AAS in comparable magnitude in ballistic networks with strong …
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Spin-orbit or Aharonov-Casher edge states in semiconductor systems
… is electromagnetically dual to the Aharonov-Bohm effect and is predicted to lead to edge states in a parabolic confinement at two-dimensional sample edges. As a narrow gap material, InGaAs has a low effective mass, high mobility, and strong spin-orbit interaction, which indicate that it can …
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A study on the ion temperature gradient driven turbulence in tokamak plasmas
… ($\chi$) undergoes a scaling transition from Bohm ($\chi\propto\chi_B$, with $\chi_B$ the Bohm diffusion coefficient) to gyro-Bohm ($\chi\propto\rho_*\chi_B$, with $\rho_*$ the normalized Larmor radius $\rho_*=\rho/R$ where $\rho$ is the ion Larmor radius and $R$ is the tokamak size). This …
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Quantum transport theory of 3D time-reversal invariant topological insulators
… transport corrugated TI channels, the Aharonov-Bohm effect in TI nanowires, supercurrent in TI Josephson junctions, and the superconducting proximity effect and resulting transport in TI-superconductor heterostructures. In doing so, we expand the understanding of quantum and mesoscopic transport …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
… amplitudes of the quantum-mechanical Aharonov-Bohm oscillations. The side gates allow for an in-plane controllable electric field. Asymmetrically biased side-gate voltages allow for the breaking of the two-dimensional parity symmetry of the ring device, effectively resulting in reduced …
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Assessing the variability of soil nitrogen mineralization
Variable N fertilizer application recommendations would benefit from crediting the N that will be mineralized and available to the crop during the growing season. During the 1994 and 1995 growing season, the spatial and temporal pattern of N mineralization was assessed on two central Kansas corn …
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