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 14 of 14 for “"self-affine"”.
-
Theoretical and practical aspects of evolutionary algorithms with application to the partitioning of multivariate self-affine time series
… practical problem of partitioning a multivariate selfaffine time series with unknown and time-varying joint distribution is considered. The aim is to completely partition the time series, possibly of high dimension, into disjoint, contiguous subseries at one timescale that are similar to subseries …
-
Change in Shoreline Position for Two Consecutive Years Using LIDAR Along the Outer Banks, North Carolina
… shoreline change signal indicates the signal is self-affine i.e. the mean is not stationary, but changes with position along the signal (Malumud and Turcotte, 1999) with a scaling exponent that varies from 1.2 to 2.1. Four of the five selected sections of coast, Wavelet analysis of the shoreline …
-
Understanding the Characteristics of Precipitation and Their Response to Climate Change
… and fractal dimensions. I further show that self-affine surfaces with a roughness exponent of 0.3 reproduce these statistics, and that the self-affine scaling theory provides analytical relations between multiple power-law exponents. Third, I further investigate the general dynamics behind …
-
Magnetic logic circuits with high bit resolution for hardware acceleration
… with a single domain wall is limited by the self-affine statistics of the wire edge roughness. The domain wall logic device is extended further into functional design implementations, including a logic-in-memory architecture to perform deep convolutional neural network operations in a hybrid …
-
Lattice-Boltzmann modeling of multiphase flow through rough heterogeneously wet fractures
… exhibiting geometrical mineral arrangements, and self-affine fractures were created to carry out drainage and imbibition simulations with different input parameters. The relationships of different wetting/non-wetting patterns and surface roughness, with interfacial areas, capillary pressure, and …
-
Absolutely Continuous Stationary Measures
… measures. If $S_1, \dots, S_n$ are similarities, affine maps, or conformal maps then $\nu$ is called a self-similar, self-affine, or self-conformal measure respectively. This thesis is concerned with Furstenberg measures and self-similar measures. Two fundamental questions about stationary …
-
Fractal image compression and the self-affinity assumption : a stochastic signal modelling perspective
… an image by the parameters of a set of affine transforms on image blocks under which the image is approximately invariant. Although the conditions imposed on these transforms may be shown to be sufficient to guarantee that an approximation of the original image can be reconstructed, …
-
The role of roughness in earthquake source physics
… are rough at all scales and can be described as self-affine fractals. This deviation from planarity results in geometric asperities and a locally heterogeneous stress field, which affect the nucleation and propagation of shear rupture. I study this effect numerically at the scale of small …
-
Effective Thermal Properties of Granular Porous Media: A Numerical Study using Lattice Blotzmann Methods
… depicts the surface topology of grains as a self-affine fractal function. This elastic deformation is a function of Young's modulus of the grains and the external compressing pressure. Based on our investigation, we observe that thermal contact resistance due to the surface roughness of …
-
Skin friction drag reduction in turbulent flows using superhydrophobic surfaces
… autocorrelation length in the case of fractal self-affine rough surfaces. Finally, a large lateral spacing between roughness peaks, along with a small root mean square roughness (compared to the viscous length scale of the turbulent flow), and the presence of a hierarchical texture with …
-
Fractal analysis of topography and reflectance surfaces
… The application of appropriate methods to self-similar or self-affine fractals is essential due to different theoretical assumptions of the methodologies. The ruler dimension is different from the spectral dimension. The application of Hanning window to the synthetic fBm samples (Hanning …
-
Propagation of fluid driven fractures in transversely isotropic material
… the fracture surfaces are very rough with a self-affine behavior in the direction of the bedding and a stationary state in the direction normal to bedding. We also investigate the effect of a non-Newtonian rheology on HF growth. We solve the problem of steadily moving semi-infinite HF driven …
-
Investigating Regional Patterns of Shoreline Change
… in alongshore sediment transport could produce self-organized, emergent features on spatial scales from sand waves to large-scale capes [<italic>Ashton et al.</italic>, 2001], introducing a new theoretical perspective to the cross-shore-oriented considerations of the coastal scientific …
-
Studies on Optically Induced DC-Voltage in Thin Film Structures
Conversion of light into direct current is important for applications ranging from energy conversion to photodetection. However, there are still many challenges to reach high conversion efficiency and broad spectral coverage. Overall, photodetection through conventional procedures is based on light …