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 24 for “"correlation lengths"”.
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Correlation lengths and times in CuMn spin glasses from simulation and experiment
… of finite-size effects are used to study correlation lengths and times of Cul-xMnx spin glasses. Several results are found: a single model inspired by the Parisi solution explains both the experimentally observed aging and equilibrium fluctuation phenomena in Cul-xMnx, and as one expects …
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Correlation Lengths and Times in Copper Manganese Spin Glasses From Simulation and Experiment
… of finite-size effects are used to study correlation lengths and times of Cu1-xMn x spin glasses. Several results are found: a single model inspired by the Parisi solution explains both the experimentally observed aging and equilibrium fluctuation phenomena in Cu1-xMnx, and as one expects …
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Correlation lengths, disorder, and dynamics of vortex matter as heard through the noise
… of vortex dynamics relying on purely dynamical correlations, rigid bundles, or simple two-state channel flow are invalid in the peak regime of2H-NbSe₂. (2) The noise reflects vortex configurations present in the pinned state, and our methods probe the static correlations among the vortices in …
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Strongly coupled systems : from quantum antiferromagnets to unified models for superconductors
… of the low-temperature behavior of the spin correlation length in various spin representations S. Using a finite-size-scaling technique, we explored correlation lengths of up to 105 lattice spacings for spins S=1 and 5/2. We show how the recent prediction of cutoff effects by P. Hasenfratz is …
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Metallicity correlations in galaxies
… local and high-redshift Universe. The two-point correlation function is a useful tool for extracting information from the 2D metallicity maps that integral field spectroscopy produces. Using the current integrated field unit observations and simulations, this thesis tries to gradually investigate …
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Metallicity correlations in galaxies
… local and high-redshift Universe. The two-point correlation function is a useful tool for extracting information from the 2D metallicity maps that integral field spectroscopy produces. Using the current integrated field unit observations and simulations, this thesis tries to gradually investigate …
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Soft Self-assembly and Densest Packings in Colloidal Models
… We also examine the behavior of different correlation lengths in such quasi-one-dimensional systems via transfer matrix method. Non-monotonicity of the correlation lengths is observed, as has been identified in the assembly simulations. For the quantities that have a Delta distribution …
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Cerebral Hemodynamics and Its Oxygenation: Study of Their Baseline and Spontaneous Oscillation
… was investigated by use of phase portrait, cross-correlation, and nonlinear dynamics analytical methods. We found that the cerebral vasomotion is temporally coherent as well as spatially coherent. The correlation lengths for temporal and spatial coherence are about 3min and 1--2 cm in our …
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Quantum Simulation of Many-body Systems with Superconducting Qubits
… a hard-core Bose-Hubbard lattice by extracting correlation lengths and entanglement entropy of superposition states generated in particular regions of the spectrum, from the band center to its edge. The results presented in this thesis are in close quantitative agreement with numerical …
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Quantifying channelized submarine depositional systems from bed to basin scale
… continuous exposure of the Zerissenne show that correlation lengths of these systems can exceed 1.5 km.
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Effect of scale and spatial variability on surface foundation on sand
… establish impact of sand density variability and correlation length ratios on foundation bearing resistance. The stochastic predictions of N[subscript gamma] show that the mean bearing response is largely impacted by the statistical distribution of sand densities, but not by correlation lengths.
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Magnetic domain formation in La1-xSrxMnO3 nanowires studied with resonant soft x-ray scattering
… their origins rooted in the differences in the correlation lengths of the underlying competing orders. Therefore studying materials in size that is comparable to these fluctuations can disentangle the complexity of the mechanism. To serve this purpose, we studied magnetic domain formation in …
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Using derivative information in the statistical analysis of computer models
… are more valuable in models which have shorter correlation lengths and emulators without derivatives generally tend to require twice as many model runs as the emulators with derivatives to produce a similar predictive performance. We conclude that an optimal solution is likely to be a hybrid …
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The effect of surface roughness on thermal and acoustic phonon transport in nanowires and nanomembranes
… A surface finish with a 5-10 nm roughness correlation length is typical in metal-assisted chemical etching. Such surfaces resonantly scatter dominant phonons in silicon, leading to the observed ~T^{1.6 - 2.4} behavior and drive the thermal conductivity below the Casimir limit. The second …
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An experimental and theoretical investigation of waveguide scatter, with applications to solution-deposited silica-titania planar waveguides
… Microscopy, ranged from about 2-5 A rms, with correlation lengths from about 0.05-0.75 μm.
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Pattern formations and relaxation dynamics in non-equilibrium systems
… Through a systematic investigation of relevant correlation functions, the interface width, and other quantities, we show that the non-trivial in-domain dynamics affect the coarsening process and the interfacial properties. The exponents which govern domain growth, aging, and interface …
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Study of Ion-Transport and Release from Carboxymethyl Cellulose and other Polymer Networks
… was used to analyze the network structure and correlation lengths of the hydrogels. It was shown that different side chains of cellulose affect the correlation length of the hydrogels, leading to changes in the release kinetics. At the same time, the ions themselves also have an effect on the …
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Tuning Melt/Brush Interactions for Functional Polymer Films
… and out-of-plane ordering respectively. Lateral correlation lengths at the top of the lm scaled as tn, where the exponent n increased from approximately 0.75 to 1 as Σ decreased from 0.6 to 0.2 nm−2. Out-of-plane defects such bent or tilted domains were detected in all films. Our results …
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Recommendations for Data Collection and Analysis During Field Testing of Ground Penetrating Radar Used to Measure Bituminous Asphalt Compaction
… goal of developing a national standard. Spatial correlation was characterized using the experimental semivariogram. This analysis revealed that the correlation length of the dielectric (and therefore air voids) ranges from 3[ft] to 45[ft] near the centerline joint, and is less than or equal to …
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Acoustic scattering of spherical directional waves by smooth and statistically rough solid elastic cylinders
… root mean square (RMS) roughness for fixed correlation length and different correlation lengths for fixed RMS roughness on the scattered field are investigated. Finally, the fluctuations of the scattered field are analyzed using the derived formulation.
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