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 30 for “"scale-invariance"”.
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Nature Images and Fractal Scale-Invariance upon Prosociality
… processing of environmental scenes) prompted by scale invariance (i.e., the extent to which stimuli repeat their own lower-level structure) has been previously demonstrated to relate to perception of natural beauty, which mediates certain effects of nature experience. Scale invariance is posited …
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Quantum Transport and Scale Invariance in Expanding Fermi Gases
… This expansion also provides a precise test of scale invariance and an examination of local thermal equilibrium as a function of interaction strength. After release from an anisotropic optical trap, we observe that a resonantly interacting gas obeys scale-invariant hydrodynamics, where the mean …
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Investigating neuronal network dynamics : scale-invariance, preferred firing rates, and plasticity via phase-shift encoding
… knowledge of neural plasticity and computation. Scale-invariant properties, which suggest self-organised criticality (SOC), have been observed in these networks, but the mechanisms underlying these dynamics have remained unclear. Despite theoretical models, there is still limited experimental …
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Overcoming unrealistic behavior of landscape evolution models attributed to the stream power incision model: Scale invariance and ultra-sensitivity to initial conditions
… of landscape evolution to investigate how large-scale landforms behave over long timescales. These models are typically reduced in complexity, where many processes are parameterized. While most studies focus on geologic timescales, some researchers have begun to use these types of models at …
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Optimised Mammogram Displays for Improved Breast Cancer Detection
… the loss of effect resulted from the lack of scale invariance of real images. This meant that, regardless of the level of global correlation between two images, the localised correlation, at a region size reflecting the visual angle subtended by the fovea, was much lower. Thus, decorrelation …
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Topics in gauge/gravity duality
… and superfluidity, non-relativistic scale invariance, quantum criticality and others. In this thesis we present several applications of gauge/gravity duality techniques to the study of such systems, some of them from a phenomenological perspective, where an \textit{ad hoc} …
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Invariance properties of the human visual system in one-shot learning
… novel stimuli, we address the question whether invariance to transformation emerges from experience and memorization of templates or from the brain instantly computing invariant representation. Our psychophysical experimental results suggest that human vision produces a representation that is …
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Effects of gravity on equilibrium crystal shapes
… crystal shape (ECS) is characterized by a scale invariance. The presence of gravity breaks the scale invariance and the resulting ECS changes as the volume of the crystal V is changed. Moreover, the presence of gravity breaks the translational invariance along the direction it acts. …
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Coupled length scales in eroding landscapes
… field is directly related to local small-scale channel-like features. From study of the correlations of these with large-scale structure of drainage basins, characteristic coupling length scales are found which indicate an important breaking of scale invariance. We also show that these …
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Studies on Low Frequency Fast Multipole Algorithms
… in the conventional translation process. The scale invariance of LF-FIPWA is studied in detail to preserve the basic Laplace equation property. To improve the efficiency at low frequencies, a novel mixed-form fast multipole algorithm is introduced. The conversion between the multipoles at low …
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Geometry-driven filamentary structures : elastic gridshells, weaves, clasps, and knots
… and precision model experiments using scale-invariance and advanced imaging techniques (e.g., 3D laser scanning, and X-ray computed tomography). First, we study the shape and the mechanical response of elastic gridshells, the three-dimensional structure of which results from the …
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Failure processes in submarine landslides: a geomorphological approach
… Slide reveals the occurrence of<br/>spatial scale invariance. One explanation for this scale invariance is that the Storegga Slide<br/>is a geomorphological system that may exhibit self-organised criticality. Spatial scale<br/>invariance may also be linked to the retrogressive nature of the …
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Stochastic Surface Growth
… theory for local stochastic growth predicting scale invariance with universal exponents and limiting distributions. For a special, exactly solvable growth model (polynuclear growth - PNG) on a one-dimensional substrate (1+1 dimensional) we confirm the known scaling exponents and identify for …
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Power-law liquid in high-temperature superconductors
… and underdoped regime. We find that broad scale invariance of a power-law liquid leads to the cuprates' superconducting dome, vanishing Fermi velocity, and diverging effective mass. We propose that a power-law liquid can arise from the presence of a scale-invariant sector known as …
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The cosmological bootstrap and the analytic wavefunction
… integer spin. Unitarity, alongside locality and scale invariance, also implies the vanishing of four-point parity odd correlators at tree level, and we show this is not true at loop level. Analyticity in the S-matrix is linked to causality and serves as the backbone for the S-matrix bootstrap, …
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Tomographic PIV measurement of coherent dissipation scale structures
Further understanding the small scale coherent structures which occur in high Reynolds number turbulence would be of enormous benefit. Therefore, the aim of the current project was to make well resolved three-dimensional flow measurements of the mixing flow between counter rotating impellers, using …
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Programming a paintable computer
… demonstrate robustness and explore the limits of scale invariance. Process fragments are shown interacting to approximate conservative fields, and using these fields to implement scaffolded and thermodynamic self-assembly.
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Design Optimization of a Regional Transport Aircraft with Hybrid Electric Distributed Propulsion Systems
… implementation of DEP is achievable due to the scale invariance of highly efficient electric motors, the current battery technology restricts its adoption for commercial transport aircraft. A Hybrid Electric Distributed Propulsion (HEDiP) system offers a promising alternative to the all-electric …
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Extreme rainfall, flood scaling and flood policy options in the United States
… flood and rainfall have been shown to exhibit scale invariance behavior over a range of space and time scales. Although various approaches have been taken to investigate and model the various scaling aspects of rainfall and floods, little theoretical work has been done on the relation between …
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Texture measures for segmentation
… filter banks. Some local descriptors calculate a scale for their local neighbourhood to achieve scale invariance. Both local and global segmentation methods are investigated. Local segmentation methods consider each pixel in isolation. Global segmentation methods penalise jagged borders or …
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