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 40 for “"External Perturbations"”.
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Monte Carlo simulation of quasi-one-dimensional semiconductors
… makes the carrier distribution sensitive to external perturbations and causes appreciable deviations from the equilibrium relatively rapidly. A Monte Carlo simulation is presented of a multisubband quasi-one-dimensional gallium arsenide-aluminum gallium arsenide structure. The model includes …
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Second order error correction in quantum computing
… lost of information from decoherence caused by external perturbations. This thesis evaluates a five qubit code for correcting second order bit-flip errors. The code consists of encoding, decoherence, decoding, and error correction steps. This work analyzes the proposed code using geometric …
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Modelling of Berry phase and Fermi-level topologies for emergent quantum phenomena prediction in selected solid state systems
… electronic states that remain robust against perturbations and offer routes to novel quantum functions. This thesis investigates three representative compounds - SrSi2, CoSi, and NbP - to reveal how external stimuli, namely tensile strain and electric fields, tune their electronic bands and …
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X-ray induced temperature dependent amorphous-amorphous transitions in the GeO2 glass
… and dynamics can be strongly modified by external perturbations such as ionizing radiation. This thesis investigates the effects of intense X-ray irradiation on vitreous germanium dioxide (v-GeO2), a prototypical strong oxide glass, by combining X-ray photon correlation spectroscopy …
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Superparamagnetic Tunnel Junctions for Reliable True Randomness and Efficient Probabilistic Machine Learning
… small device area result in high sensitivity to external perturbations, as well as large variations from device to device. Here, we present an experimental demonstration of three-terminal sMTJs as reliable and potentially scalable sources of true randomness in the field-free regime. By leveraging …
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Quantification of the human postural control system to perturbations
… resisting destabilizing forces from internal and external perturbations. To assess the human PCS, postural sway during quiet standing or in response to external perturbation have frequently been examined descriptively. Minimal work has been done to understand and quantify the robustness of the PCS …
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Foundations of the Geometric Mechanics Udwadia-Kalaba Framework for Rigid Body Constrained Motion Analysis
… the system under unmodeled dynamics and external perturbations. In addition, the UK formulation has been historically applied to systems with equality constraints. However, it has not been formulated for usage with inequality constraints. Here, the implementation of slack and excess …
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External control of semiconductor nanostructure lasers
… overcome these limitations is through the use of external control techniques. The electrical and/or optical external perturbations can be implemented to improve the parameters associated with the intrinsic lasers dynamics, such as threshold gain, damping rate, spectral linewidth, and mode …
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Monitoring Bacteria Cultures Using Near Infrared (nir) Binary Spectronephelometry (bsn), Raman Spectra and Principal Component Analysis (pca)
… of using BSN to monitor cultures subjected to external perturbations are shown. Specific characteristics of Principal Component Analysis (PCA) of Raman spectra, and their variation in bacterial cultures, as well as assessing the role of bacterial transport e.g., diffusion in performing and …
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Winter climate response to continental snow anomalies
… nevertheless be triggered through a myriad of external perturbations. In this thesis the influence of one hypothesized external perturbation, continental-scale land surface snow anomalies, is investigated. Satellite observations of historical autumn-winter snow cover are used to develop model …
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Analyzing physical system interaction
… no power could enter through command inputs or external perturbations. As such, the stability results have a narrow range of applications. Even though passive systems may be commonplace, the inability to actively control the interaction limits their practicality. Analyzing interaction accounting …
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Implications of Vorticity and Disorder on Quantum Transport in Topological Semimetals
… a wide range of unconventional responses to external perturbations. In this dissertation, we explore two distinct but conceptually related themes within the broad domain of topological and disordered condensed matter systems. In the first part, we investigate vortical and converse vortical …
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Linking Single Particle Dynamics to Macroscopic Phenomena in Colloidal Gels
… and macroscopic response of colloidal gels to external perturbations. We initially investigate links between the morphologies of stable particle-clusters in weak depletion systems and the microstructure of space-spanning gels. Next, we test the hypothesis that thermally activated-particle …
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Mathematical Modelling of Emergent Survival in Microbial Communities
… stability, invasion success, and resilience to external perturbations. The concept of emergence – where community-level behaviours and properties arise from interactions among individual member species – has proven essential for understanding microbial ecosystems like the gut microbiome, where …
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Measurement of the effectiveness of enhanced external counterpulsation on heart rate variability for patients with myocardial ischemia
… autonomic nervous system caused by the Enhanced External Counterpulsation treatment. The treatment is a non surgical, mechanical procedure that can reduce the symptoms of angina or Congestive Heart Failure, presumably by stimulating the opening, or formation of, small branches of blood vessels …
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Gravitational Waves From Perturbed Kerr Black Holes: Two Investigations
… describing the response of the black hole to external perturbations. Relying on the formalism developed by Mano, Suzuki and Takasugi, we improve and extend previous calculations of the contribution to the Green's function coming from quasinormal mode residues in the complex frequency plane …
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Bayesian Approaches for the Mechanistic Analysis of Protein Aggregation Kinetics
… formation, in particular in the context of how external perturbations may affect this process. Furthermore, I extended this state-of-the-art approach to account for the stochastic nature of protein aggregation. Stochastic effects affect amyloid formation in two main ways, namely through (i) …
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Models of generalization in motor control
… adaptation to viscous force perturbation. When external perturbations were applied to the hand during a reaching task, the movement became distorted. This distortion motivated the CNS to produce counterbalancing forces, which resulted in the modification of the internal model for the task. …
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Managing the impact of change through survivability and pliability to achieve viable systems of systems
… that operate in diverse contexts, where numerous perturbations exist that threaten the ability of the SoS to deliver acceptable value to its diverse set of stakeholders. Furthermore, the systems of systems themselves can change form voluntarily or involuntarily in response to contextual …
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Investigating multiphoton phenomena using nonlinear dynamics
… control functions (which act on the system as external perturbations) to the relevant Hamiltonians. These phase-space structures may be periodic orbits, invariant tori or their stable and unstable manifolds. One-electron systems and diatomic molecules are fundamental and important staging …
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