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 22 for “"Magnetic Field Effects"”.
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Approaching magnetic field effects in biology using the radical pair mechanism
… to understand or explain some of the reported magnetic field effects in biology (see Chapter 1 for examples) using the radical pair mechanism, a quantum mechanical mechanism known for over 20 years that lets the yields of certain radical pair reactions depend on the applied magnetic field [1, …
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Strong Magnetic Field Effects and Molecular Processes with Applications to White Dwarfs
… transitions of hydrogenlike atoms in external magnetic fields of strength applicable to magnetic white dwarfs, i.e. B < 10<sup>3</sup> megagauss, have been investigated for field-free principal quantum numbers n < 6. Finite proton mass corrections are included. Relativistic corrections are also …
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Electronic processes in organic optoelectronics : insights gained through modeling and magnetic field effects
… focus on quantum-mechanical kinetic modeling of magnetic field effects (MFEs) that probe underlying subprocesses. Certain organics are capable of dividing excited states in a process termed singlet fission, which can increase the maximum theoretical efficiency of an OPV by a factor of nearly 1/3. …
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Optical properties of GaAs coupled quantum wells and superlattices: electric and magnetic field effects
In this thesis the effects of electric and magnetic fields on the optical transmission and reflection spectra of GaAs/ AlGaAs coupled quantum wells and superlattices are investigated and their potential application in optical modulation demonstrated. Quenching and enhancement of excitonic …
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Modulated Magnetic Field Effects, Molecular Design, and Indigoids: A Mechanistic Study of Singlet Fission
… and the use of an alternative method, modulated magnetic field effects in photoluminescence (modMPL), as a potential screening tool for materials. After relevant theoretical and experimental background is discussed in Chapters 2 and 3, Chapter 4 presents an alternative method for investigating …
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Effects of Nuclear Elastic Scattering and Modifications of Ion-Electron Equilibration Power on Advanced-Fuel Burns
The effects of Nuclear Elastic Scattering (NES) of fusion products and modifications of the ion-electron equilibration power on D-T and D-based advanced-fuel fusion plasmas are presented here. The processes causing the modifications to the equilibration power included here are (1) depletion of …
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
Ferrofluids are conventionally used in such DC magnetic field applications as rotary and exclusion seals, stepper motor dampers, and heat transfer fluids. Recent research demonstrates ferrofluid use in alternating and rotating magnetic fields for MEMS/NEMS application of microfluidic devices and …
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Predicting Kinetics of Spin-Dependent Reactions in an External Magnetic Field with Nonadiabatic Statistical Theory
… reactions under the influence of an external magnetic field. We tackle the complexities of computational modeling of reactions characterized by non-radiative transitions between electronic states with different spin multiplicities in a range of magnetic fields using the nonadiabatic …
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Spin-sensitive probes of triplet excitons in organic semiconductors
… avoided level-crossings in applied magnetic fields to quantify the strength of exchange coupling and identify specific optical signatures of exchange-coupled triplet pairs. Using high magnetic fields ($\leq\mbox{60 T}$) we isolate and measure the exchange coupling and optical …
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Taming Quantum Noise in the Open: Spin Biophysics under Optimal Control
… holds promise for the targeted manipulation of magnetic field effects (MFEs), with potential applications ranging from the design of noise-resilient quantum information processors to genetically encodable quantum sensors. However, achieving precise handles over the intricate interplay between …
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The effects of disorder on superconducting islands and island arrays
… focuses on (1) systematically characterizing the effects of disorder in the presence of thermal and magnetic field effects and (2) defining and tuning disorder parameters in a controllable and reproducible manner. We studied two different superconducting systems: single and coupled Nb islands as …
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The effect of shear flow on the Isotropic-Nematic transition in liquid crystals
In this thesis I will discuss the effects of shear flow on the Isotropic-Nematic phase transition in liquid crystals. Shear flow has dramatic orienting effects on the rod-like constituents of nematic liquid crystals, with the general effects of (1) inducing order in the high-temperature isotropic …
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Measurement of The Electron Return Effect Using Presage Dosimeter
… media, caused when radiation is delivered in the magnetic field. The ERE poses clinical concerns in MRgRT because it significantly enhances the dose at interfaces, and the intensity and pattern of the dose enhancement depends on many factors. The ERE results in a complex pattern of dose …
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Investigation on the Mechanism of Electrocodeposition and the Structure-Properties Correlation of Nickel Nanocomposites
… behavior of nanoparticles in a metal matrix, the effects of a variety of interrelated process parameters on the composite film formation have been investigated systematically. Nanocomposites containing metal and metal oxide nanoparticles in a nickel matrix have been prepared by means of ECD from …
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Electrochemical Phase Formation of Ni and Ni-Fe Alloys in a Magnetic Field
The aim of this work was to investigate the effects that a magnetic field can induce during the electrodeposition of Ni and Ni-Fe alloys. Special regard was given to mass transport controlled effects. Magnetic field effects on the nucleation and growth of ferromagnetic layers and on the properties …
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Small-scale fluctuations in D-region ionization due to hydrodynamic turbulence
… turbulent motion of the neutral gas with uniform magnetic and gravitational fields. New effects are found which are due to the production of ionization inhomogeneities by the accelerations of the neutral gas and -to the coupling of the fluxes of charged particles with the spatial derivations of …
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Model-based reconstruction for correcting magnetic susceptibility-induced artifacts in magnetic resonance imaging
While magnetic susceptibility is an essential contrast mechanism in magnetic resonance imaging (MRI), it also causes significant disruptions to the imaging process. Strong differences in magnetic susceptibility exist at the air and tissue interfaces in the brain, resulting in a magnetic field …
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Shear flow instabilities in stratified magnetohydrodynamics
… we investigate how stable stratification and magnetic fields affect instabilities of a Kolmogorov shear flow in different parameter regimes of the Boussinesq magnetohydrodynamic (MHD) framework, extending the two-dimensional (2D) model from Balmforth (2002) to include a uniform horizontal …
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Tight-binding simulations of random alloy and strong spin-orbit effects in InAs/GaBiAs quantum dot molecules
… to correctly capture non-traditional alloy effects of \ce{GaBiAs}. Additionally, an atomistic model allows for the study of configurational variances and clustering effects of the alloy. We find that in \ce{InAs} QDMs with a \ce{GaBiAs} inter-dot barrier, hole states are well confined to the …
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