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 32 for “"phase dynamics"”.
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Phase dynamics of irregular oscillations
… Dissertation wird eine Beschreibung der Phasendynamik irregulärer Oszillationen und deren Wechselwirkungen vorgestellt. Hierbei werden chaotische und stochastische Oszillationen autonomer dissipativer Systeme betrachtet. Für eine Phasenbeschreibung stochastischer Oszillationen müssen zum …
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Segregation and Phase Dynamics in Supported Bimetallic Nanoparticles
… unique intermetallic Pt-Si surface structural phases with $(\surd7$ x $\surd7)R\pm19.1\sp\circ$ and $(\surd19$ x $\surd19)R\pm23.4\sp\circ$ real space unit cells as characterized by low energy electron diffraction (LEED). The reactive properties of each overlayer were studied, with respect to …
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Rotational Symmetry and Phase Dynamics in Topological Superconductors
Topological superconductors are phases of matter that cannot be adiabatically connected to a trivial superconductor without closing the bulk gap or breaking some fundamental symmetry. Intimately tied to topological superconductors are Majorana bound states. These are neutral zero-energy …
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Simulation of two-phase dynamics using lattice boltzmann method (LBM)
… model), is proposed for the simulation of two-phase dynamics. The model is based on the principle of free energy minimization and invokes the Gibbs-Duhem equation in the formulation of non-ideal forcing function. Bulk regions of the two phases are governed by a non-ideal equation of state (for …
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Phase dynamics and magnetic field response of proximity-coupled superconductor arrays
… XYmodel, show interesting behavior relating to phase coherence, fluctuations, and dynamics. Our samples display a broad transition to zero-resistance at a field-dependent temperature Te(H). Present theories explain the transition at Te (in zero field) as an unbinding of pairs of …
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Quantum-classical and semiclassical path integral methods for condensed phase dynamics
Chemical dynamics are essentially quantum mechanical processes. A great variety of chemical processes such as electron transfer and energy relaxation occur in condensed phase, reactants and products embedding in a non-reactive solution/environment. Therefore, quantum dynamics in condensed phase is …
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Recovery of crude oil from saturated porous media as a function of geochemistry and wetting-phase dynamics for multiple remediation flushing strategies
… controlling mobilization of trapped nonaqueous phase liquid (NAPL) crude oil as a function of wetting phase dynamics and geochemistry during enhanced-flushing conditions. Synchrotron X-ray microtomography (SXM) was used to perform pore-scale examination of NAPL fragmentation and changes in blob …
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Fluxon Dynamics In Two-Gap Superconductor-Based Long Josephson Junction
… superconductors, can lead to more interesting phase dynamics than those with one-gap superconductors. The phase dynamics in a long Josephson junction (LJJ) may be described by using the sine-Gordon equation. The difference in the phase dynamics between the LJJ with two-gap superconductors and …
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Pattern formation through synchronization in systems of nonidentical autonomous oscillators
… which reduces general oscillatory systems to phase dynamics. The symmetry of the coupling plays an important role for the formation of patterns. We have studied the ordering influence of an asymmetry (non-isochronicity) in the phase coupling function on the phase profile in synchronization and …
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Octave-spanning lasers for optical metrology applications
… A detailed study of the carrier-envelope phase dynamics and noise characteristics of octave-spanning Ti:sapphire lasers is presented. We model the effect of the laser dynamics on the residual carrier-envelope phase noise by deriving a transfer function representation of the octave-spanning …
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Ising Machine Based on Electrically Coupled Spin Hall Nano-Oscillators
… an analytical framework describing how the dynamics of an electrically coupled array of spin Hall oscillators can be mapped to the Ising Hamiltonian based on the device characteristics. Our analytical model is integrated into a lightweight and versatile Verilog-A device that is used to model …
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A numerical study of shock-induced hot spot generation in energetic material
… mechanics. Governing equations for the condensed-phase and gas-phase dynamics are derived which contain important processes including viscoplastic heating, finite-rate reaction, mass transfer and heat exchange. The system of equations are solved with two different numerical techniques. Through …
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Active control of an automobile suspension system for reduction of vibration and noise
… to be difficult, due to undesirable non-minimum phase dynamics.
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The Application of On-line Estimation to a Double Effect Evaporator
… be determined without a knowledge of the vapour phase dynamics. The response of the reduced model linulgtan closely follows the plant response to an identical disturbance and so this model is adopted for Kalman filter experiments.
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Feedback control of complex oscillatory systems
… a goal to suppress their synchronous collective dynamics. The other part is aimed at investigating linear feedback control of coherence of a noisy or chaotic self-sustained oscillator. First we start with a problem of suppressing synchronization in a large population of interacting neurons. The …
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Experiments with Bose-Einstein condensates in a double-well potential
… into a double-well potential, and the relative phase of the two split condensates was shown to be reproducible. Microfabricated atom chips were developed with prospect for chip-based confined-atom interferometry. The same dynamical splitting scheme was implemented in a purely magnetic …
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Theoretical studies on the properties and dynamics of electronic excited states
… states with semi-local functionals. Condensed phase dynamics of excited states are even more intractable on account of the computational cost scaling exponentially with the number of condensed phase particles under consideration. However, it is still possible to develop cheap but accurate …
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Joint time-frequency analysis and filtering of single trial event-related potentials.
… methods.A new technique to investigate the phase dynamics of ERPs was developed. This was successfully applied, along with other techniques, to the investigation of independent component analysis (ICA) component activations in a visual spatial attention task. Two components with scalp …
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