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 17 of 17 for “"one-dimensional system"”.
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Limit theorems for a one-dimensional system with random switchings
We consider a simple one-dimensional random dynamical system with two driving vector fields and random switchings between them. We show that this system satisfies a one force - one solution principle and compute its unique invariant density explicitly. We study the limiting behavior of the …
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Dynamical large deviations and phase separation in systems of interacting particles
… large deviations in the clustering of diffusing systems, mainly through the lens of macroscopic fluctuation theory (MFT). Additionally we study optimal control forces in such ensembles. First, we consider a one dimensional system of hard-core diffusing particles and focus on the large deviations …
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Active and Passive Transport at Interfaces
… have been investigated. In each of them one physical aspect of active and passive transport is discussed. The four systems are arranged and discussed in four separate chapters. In chapter 3 and 4 we study the effect of static or hydrodynamic interactions on the cross over from individual …
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Spin wave characterization in a 1D YIG magnonic crystal
… wave propagation characteristics measured in a one-dimensional (1D) yttrium iron garnet (YIG) magnonic crystal using time-resolved Brillouin light scattering (TR-BLS) measurements. Magnonic crystals are a promising candidate to aid in developing spin-based devices that exploit the spin of the …
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Pairing and entanglement: quantum Monte Carlo studies
… Carlo (VMC) methods. PIMC is used to model a one-dimensional system of fermionic lithium atoms according to existing experiments, including a realistic temperature. New estimators of the pair momentum distribution are implemented, yielding in a clear in-situ signature of a pairing mechanism …
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Computational analysis of thermo-acoustic instabilities in combustion chambers and afterburners
… acoustic limit, with each burner modeled as a one-dimensional system, featuring acoustic damping and a compact heat source. The coupling between the burners is accounted for by solving the two-dimensional wave equation over an annular region, perpendicular to the burners, representing the …
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Controlling the Walrasian tatonnement process
… process. It is shown that the stability of the system depends upon the speed of adjustment and holdings of endowments as well as preferences. It is then shown that periodic solutions as well as aperiodic or chaotic trajectories occur. The analysis is then extended to multiple agents. Having …
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The effect of quantum confinement on the thermoelectric figure of merit
… at nano-scale dimensions to achieve low-dimensional thermoelectric structures which may be superior to their bulk forms. In this thesis, I established the basis of the low dimensional thermoelectric transport principle in the Si/Si1-xGex quantum well superlattice (two-dimensional) system …
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Elektronen-Energieverlustspektroskopie von quasi-eindimensionalen Kupraten und Vanadaten
… of the electronic structure of quasi one-dimensional cuprates and vanadates. Electron energy-loss spectroscopy in transmission was employed to measure the momentum-dependent loss function of Li2CuO2, CuGeO3, V2O5 and NaV2O5. The comparison between the experimental data and the results …
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Numerical studies on many-body localization
"Under certain conditions, an interacting system can defy the concept of thermalization, a keystone in our understanding of physical processes. Many-body localization (MBL) is a phase of matter in which thermalization does not apply and ergodicity is broken. This striking behavior, which can …
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Topics in the Theory of Quantum Degenerate Gases
… We derive simple equations of motion for this system closely analogous to the Bloch equations. We also map the dynamics of the system onto those of a classical particle in a well. We find novel density and spin modes of oscillation and new stable equilibrium points of the motion. Finally we …
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Topics in the theory of quantum degenerate gases
… We derive simple equations of motion for this system closely analogous to the Bloch equations. We also map the dynamics of the system onto those of a classical particle in a well. We find novel density and spin modes of oscillation and new stable equilibrium points of the motion. Finally we …
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Tunable mechanical bandgaps in elastic metamaterials: Patterning, straining, and spatiotemporal modulation
… macro properties compared to natural material systems. In this work, we first present a novel mechanism for evolving the elastic band gap structure in a bio-inspired composite through tension induced non-planar interfacial deformation. We show that band gaps emerge and may be tuned using …
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Metallic Ground State of Functionalized Carbon Nanotubes
… geometric structure, they are a paradigm for one-dimensional systems. Furthermore, depending on their chirality, they can be either metallic or semiconducting. The SWCNT are arranged in bundles of some ten nanotubes with a random distribution of semiconducting and metallic tubes. They are thus …
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Pair density wave superconducting states and statistical mechanics of dimers
… (ELC) phases, its topological aspects in a one dimensional model and its appearance in a quasi-one dimensional system. On the other hand, chapter 5 is focused on the investigation of the classical statistical mechanics properties of dimers, in particular, the dimer model on the Aztec diamond …
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Resonance Raman spectroscopy of single-walled carbon nanotubes
The unusual one-dimensional properties of phonons in crystalline arrays of carbon nanotubes is presented. The main technique for probing the phonon spectra is Raman spectroscopy and the many unique and unusual features of the Raman spectra of carbon nanotubes are highlighted. Various features of …