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 54 for “"wave dynamics"”.
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Low frequency charge-density wave dynamics
The low frequency dynamics of the charge-density waves in NbSe$\sb3$ and TaS$\sb3$ were investigated using low frequency conductance fluctuations. Simultaneous measurements of the fluctuations in the voltage and the differential resistance revealed a theory of threshold voltage fluctuations can …
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Exploring Matter-wave Dynamics with a Bose-Einstein Condensate
… of Rb-87 as a model system to study novel matter-wave effects that traditionally arise in vastly different systems, yet are difficult to access. We study the scattering of a particle from a repulsive potential barrier in the non-asymptotic regime, for which the collision dynamics are on-going. …
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The pilot-wave dynamics of walking droplets in confinement
… statistics may emerge from the walker's chaotic dynamics is elucidated.
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Millimeter-wave dynamics and control of Rydberg-Rydberg transitions
… a coherent coupling of an optical and millimeter-wave photon. I demonstrate this coherent coupling in an ensemble of barium atoms, and provide a theoretical description of how to provably perform complete STImulated Raman Adiabatic Passage (STIRAP).
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Magnetic ordering and spin wave dynamics in transition metal arsenides
Ever since spin orbit torque based switching was proposed in antiferromagnets, there is a growing interest in using a metallic antiferromagnet as an active component of a spintronic device. Arsenic forms a large pool of magnetic metals in combination with transition metal atoms. In this report, we …
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Nonlinear wave dynamics of continuum phononic materials with periodic rough contacts
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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On ocean wave dynamics and their importance on assessing wave energy converters performance
L'abstract è presente nell'allegato / the abstract is in the attachment
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Ultracold quantum gases in one-dimensional optical lattice potentials : nonlinear matter wave dynamics
… thesis I report on experiments on the quantum dynamics of matter waves in a onedimensional lattice potential. A 87Rb Bose-Einstein condensates is prepared in a one-dimensional waveguide in the lowest band of a superimposed optical lattice potential. The action of a weak lattice potential allows …
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Perturbations and symmetry in gravitational theories : wormholes, wave dynamics, and quantum effects in rotating spacetimes.
… from coordinate artifacts, and organizing wave dynamics in classical and quantum regimes. Part I establishes a gauge-invariant treatment of perturbations in flat, cosmological, and metric f(R) gravity backgrounds. Using plane gravitational waves, the Bardeen formalism is constructed and …
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Stimulus parameters influencing cortical responses by transcranial magnetic stimulation targeting I-wave dynamics : duration, intensity and interval between interventions
… ms between pulses) corresponding to indirect (I)-wave periodicity (iTMS) on cortical excitability changes. To assess cortical excitability changes, single-pulse motor evoked potential (MEP) amplitude before and following the intervention, and paired-pulse motor evoked potential (iMEP) amplitude …
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Combustion Physics and Inverse Modeling of Energetic Materials
… involves intricate multi-scale and multi-phase dynamics, where the interplay of chemical reaction and transport processes results in complex wave patterns across a wide range of length scales from nano to millimeter. Our limited fundamental understanding of these combustion processes poses a …
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Walking droplets confined by applied or topographically-induced potentials : dynamics and stability
… We here explore this hydrodynamic pilot-wave system through an integrated theoretical and experimental approach. We provide a theoretical characterization of the transition to chaos in orbital pilot-wave dynamics for droplets walking in the presence of a Coulomb, Coriolis, or central …
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Transport studies and phenomenological model for sliding charge-density waves in quasi-one-dimensional conductors
Transport studies examining the dynamics of one-dimensional charge-density wave (CDW) condensates are reported. Results using rf and dc, linear and nonlinear electrical transport techniques have been obtained at temperatures below the CDW transition in the quasi-one-dimensional materials …
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A Multi-Sensor Passive Occupant Localization
… measurement uncertainty, and complex wave dynamics. To this end, we develop comprehensive models that characterize both random and systematic errors introduced by accelerometers, integrating these models into the localization framework to enhance accuracy. Furthermore, we quantify the …
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MULTI-FACTOR ANALYSIS OF HYDRO-MORPHOLOGICAL DYNAMICS IN THE PAJARO RIVER LAGOON
… a multi-factor analysis of hydro-morphological dynamics in the Pajaro River Lagoon over a 40-year period (1984-2024). Utilizing the Inlet Tracker program, images from Landsat and Sentinel-2 datasets were processed to determine inlet states and quantify channel migration patterns. Validation with …
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Acoustic/Gravity Wave Phenomena in Wide-Field Imaging: From Data Analysis to a Modeling Framework for Observability in the Mlt Region and Beyond
<p>Acoustic waves, gravity waves, and larger-scale tidal and planetary waves are significant drivers of the atmosphere’s dynamics and of the local and global circulation that have direct and indirect impacts on our weather and climate. Their measurements and characterization are fundamental …
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
Internal gravity waves are buoyancy-driven oscillations which can arise in a density-stratified fluid. They exist throughout the oceans and atmosphere, the oceanic internal wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. …
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
Internal gravity waves are buoyancy-driven oscillations which can arise in a density-stratified fluid. They exist throughout the oceans and atmosphere, the oceanic internal wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. …
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A Survey of Seasonal, Hemispheric and Interannual Variations in the Gravity Wave Spectrum in the Upper Stratosphere and Lower Mesosphere
… a comprehensive, multi-year analysis of gravity waves (GWs) in the Earth's middle atmosphere using satellite observations from the Cloud Imaging and Particle Size (CIPS) instrument and the Atmospheric Infrared Sounder (AIRS). Data from the years 2019–2021 are examined, covering both stratospheric …
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Intercalation dynamics in lithium-ion batteries
… Ceder, and Bazant for the ion intercalation dynamics in a single crystal of rechargeable-battery electrode materials. It is based on the Cahn-Hilliard equation coupled to reaction rate laws as boundary conditions to handle the transfer of ions between the crystal and the electrolyte. In this …
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