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 11 of 11 for “"Spectral stability"”.
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Spectral stability of solutions to Whitham-type equations with a nonlocal kernel
… differential equations. This is done using a spectral cosine collocation method, and the stability of the travelling wave solutions found is then assessed using the Fourier-Floquet-Hill method. This is first done on a number of examples. Next, a variation of the Whitham equation which uses a …
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Synthesis and characterization of novel conjugated polymers and rod-coil block copolymers
… copolymers have been synthesized to improve the spectral stability, hole-injection properties and water processibility which are the major challenges for PF-type materials. The focus of this work has been to examine whether properties of conjugated polymers can be manipulated through making …
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Modulational instability in some shallow water wave models
Modulational or Benjamin-Feir instability is a well known phenomenon of Stokes' periodic waves on the water surface. In this dissertation, we study this phenomenon for periodic traveling wave solutions of various shallow water wave models. We study the spectral stability or instability with respect …
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Stability of Periodic Waves in Nonlocal Dispersive Equations
… Dr. Mathew Johnson, we study the existence and stability of periodic waves in equations that possess nonlocal dispersion, i.e. equations in which the dispersion relation between the temporal frequency, omega, and wavenumber, k, of a plane wave is not polynomial in ik. In models that involve only …
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Existence and Stability of Solitary Waves for NLS with Defects
… dissertation is to investigate the existence and stability of solitary waves to dispersive partial differential equations and, in particular to nonlinear Schr\"odinger equations with defects nonlinearity. First we identify necessary and sufficient conditions for the existence of appropriately …
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Nonlinear waves in systems with PT/CP - symmetric potentials
… solitons of the systems and explore their spectral stability. The perturbation theory is used to perform the analysis in the case of weak coupling between the lattices, which is then verified by numerical calculations. Such analysis is based on the concept of the so-called anticontinuum …
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Control and Time Integration Algorithms for Real-Time Hybrid Simulation
… by means of frequency response functions and stability analysis were carried out. In order to facilitate delay compensation, another novel compensation scheme characterized by overcompensation and optimal feedback was conceived. Numerical simulations and realistic RHS were performed to examine …
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Study of spatiotemporal changes within the abandoned flotation plant site of Kirki (NE Greece) via clustering on Sentinel-2 data
… have never been examined through satellite-based spectral analysis. This thesis applies multi-temporal remote sensing to characterize contamination patterns across the Kirki tailings complex between 2015 and 2022. Thirty-one cloud-free Sentinel-2 acquisitions were processed to extract per-pixel …
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Stability bounds for nonlinear dispersive Hamiltonian partial differential equations
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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Stability study in lead-halide perovskite light-emitting diodes
… diode (LED) technologies. However, poor device stability continues to be the limiting factor for perovskite LEDs (PeLEDs) to be realised towards commercialisa- tion. In this thesis, the stability study was first demonstrated on methylammonium lead bromide (MAPbBr3) PeLED device under continuous …