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 33 for “"Fractal dimensions"”.
-
Classification of galaxies using fractal dimensions
… shapes could lead to automatic classification. Fractal dimension, a quantity related to the complexity of a given shape, could be such a measure. Capacity dimension and correlation dimension are two of the several types of fractal dimensions. In this project, correlation dimensions and the …
-
Fractal Dimensions in Classical and Quantum Mechanical Open Chaotic Systems
Fractals have long been recognized to be a characteristic feature arising from chaotic dynamics; be it in the form of strange attractors, of fractal boundaries around basins of attraction, or of fractal and multifractal distributions of asymptotic measures in open systems. In this thesis we study …
-
An Investigation of Seismic Reflectivity Spectra, Moments, and Fractal Dimensions
Statistical models for seismic reflectivity spectra provide means of generating numerical reflection sequences as a priori information for seismic inversion, to test geophysical data processing techniques, and to parameterize real reflection sequences for classification purposes. I tested the …
-
Fractal structure of aggregates induced by shear motion.
… and differential sedimentation are found to be fractals. To characterize the structure and properties of these aggregates, a set of equations was derived to describe the relationship between aggregate size and solid volume, porosity, density, settling velocity and collision efficiency. By …
-
A Fractal Analysis of the Detection of Glucose Molecules on Biosensor Surfaces
A fractal analysis for the binding and dissociation of glucose molecules to different biosensor surfaces is presented. The sensors contain immobilized glucose oxidase enzymes that have an affinity for the glucose molecules in solution. Data for different modified biosensors is modeled and analyzed, …
-
Assessing the relationship between recurring and nonrecurring traffic congestion
This discussion develops an approach for using fractal geometry and diffusion limited aggregation to describe highway traffic flow. The formulation is platoon based and is most applicable for describing uninterrupted-flow facilities. The model explains empirical models in terms of fractal …
-
Analysis of gas differential diffusion through porous media using prompt gamma activation analysis
… macro porosity, and pore volume and pore surface fractal dimensions. Experiments with argon or xenon diffusing through a nitrogen saturated geological media were conducted. The noble gas concentration variations at its source were measured using prompt gamma activation analysis and later compared …
-
Fractal analysis of topography and reflectance surfaces
The definition of a fractal has been successfully deduced from constructing the Koch curve and the Cantor set. Principles of seven methods (the ruler, box-counting, spectral structure function, intersection methods, cube-counting, and triangular prism methods) for determining the fractal dimensions …
-
Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds
… and other areas. Quantitative description of fractal scaling behavior of runoff and stream network morphometry in agricultural watersheds has not been previously reported. In the present study, fractal and multifractal scaling of daily runoff rate in four experimental agricultural watersheds …
-
Aspetti innovativi per la valutazione e la misura della porosità nei materiali dell'edilizia antica e moderna. La geometria frattale della porosità
… and modern construction materials. The role of Fractal Geometry on porosity characterization and transport phenomena. This work studied the potential of Fractal Geometry to the characterization of porous materials. Besides the descriptive aspects of the pore size distribution, the fractal …
-
Understanding the Characteristics of Precipitation and Their Response to Climate Change
… at the power-law frequency distributions and fractal dimensions of tropical precipitation clusters. I propose a viewpoint that regards precipitation as thresholded islands on a rough column-water vapor (CWV) topography, which is supported by good agreement between the precipitation clusters …
-
Multi-scale Real Gas Transport in Shale Matrix
… conductance owns negative relationships with fractal dimensions of pore size and tortuosity of shale matrix, and positive relationship with minimum pore size. Gas production is underestimated without considering nano-scale pore size distribution-based gas transport mechanisms. A higher fractal …
-
Renormalization analysis of continuum models on fractal domains
… begun extension of continuum thermomechanics to fractal media which are specified by a fractional mass scaling law of the resolution length scale R. The focus is on pre-fractal media (i.e., those with lower and upper cut-offs) through renormalization analysis into continuum models, in which the …
-
Microwave curing of hybrid inorganic-organic ceramers and some additional structural features of these material
… the ceramers using SAXS, gives an idea of the fractal dimensions of the scattering phases. These investigations have also proved quite conclusively that there exists a contribution to scattering from the porosity present in the inorganic phase at metal alkoxide contents as low as 40 wt%.
-
Investigation of novel biomarkers associated with renal disease
… and venular calibre, arterio-venous ratio (AVR), fractal dimension, and tortuosity were measured and their associations with estimated glomerular filtration rate (eGFR) and urinary albumin to creatinine ratio (ACR) were tested in population-based and clinically derived populations. Measurements of …
-
Fractal analysis of topography and structure across the Appalachian foreland of West Virginia
Fractal analysis was conducted on topographic relief and seismic reflection travel time data in the state of West Virginia to determine the potential influence of subsurface structure on surface topography. Seismic travel-times digitized from two east-west seismic profiles and topographic relief …
-
Characterization of functionally graded materials through fractal geometry
… and characteristics of the FGM in terms of fractals. There has been no prior literature on linking FGM and fractals. We characterize the interfaces between the two- phase FGM using fractals and estimate an interfacial fractal dimension for varying degrees of coarseness. Also, the variation …
-
Fractal relationships and spatial distribution of ore body modelling
… many methods of assessing spatial variability. Fractal dimensions also give us a measure of spatial variability and have been found to model many natural phenomenon successfully (Mandelbrot 1983, Burrough 1981), but until now fractal modelling techniques have not been able to match the …
-
Fractals in mechanics of materials
Fractal concepts have been used in geometric characterizations as well as models of various material microstructures and deformation patterns. The first part of this dissertation studies fractal patterns of plastic regions observed in elastoplastic deformations. As a paradigm, we focus on a random …
-
SOME MAGNETIC PROPERTIES OF BORE CORE SEDIMENTS
… Chapter 9 describes a novel attempt in using fractal geometry to statistically depict the geomagnetic field reversal sequence. A fractal distribution is shown to occur for longer geomagnetic polarity intervals (> 0.28 Ma) in terms of a power law relationship between interval length and …
Page 1 of 2