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 11 of 11 for “"Fractal Structures"”.
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Mathematical Modelling of Novel Ultrasonic Transducers with Fractal-Like Geometries
… a range of length scales. In<br/>particular, pre-fractal designs are utilised. A variety of fractal structures have been considered in this thesis. The effect of an infinitely ramified Sierpinski carpet device necessitates an adaptation on the renormalization approach so that a Green function …
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Contributions to computational phylogenetics and algorithmic self-assembly
… then turn to the algorithmic self-assembly of fractal structures from DNA tiles and investigate approximating the Sierpinski triangle and the Sierpinski carpet with strict self-assembly. We prove tight bounds on approximating the Sierpinski triangle and exhibit a class of fractals that are …
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Simulation algorithms for fractal radiation
… thesis presents a method to analyze a series of structures, referred to as fractals, that radiate electromagnetic waves. The fractal series are components of the so-called "Minkowski island", and the patterns are generated, through successive iterations, from a square patch, usually referred to …
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Precipitation, Aggregation, and Settling of Asphaltenes from n-Alkane Diluted Bitumens
… in air and nitrogen. The size distribution, fractal dimension, and settling rates of the aggregates were also measured. Asphaltene aggregates were found to be fused fractal structures that are insensitive to shear once formed. A semi-empirical correlation for their fractal dimension was …
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Continuum Methods and Tightness Results for Non-Simple SLE and CLE: Existence, Interactions, and Metric Approximations
… Conformal Loop Ensembles (CLE), which are random fractal structures describing scaling limits of interfaces in two-dimensional statistical physics models. In particular, we deal with the construction and interaction of SLEκ curves and CLEκ loops in the non-simple regime κ∈(4,8], where the curves …
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Molecular pathways of silica nanoparticle formation and biosilicification
… characterised by open, polymeric (i. e., mass fractal) structures. The kinetics of particle growth were unaffected by the two different methods to induce silica polymerisation (pH-drop vs. T-drop) however, the growth processes proceeded substantially slower if silica polymerisation was induced …
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Dynamics of frustrated magnetic systems – Emergent fractals and anomalous magnetic noise in spin ice
… new model leads to is the emergence of dynamical fractal structures on which the magnetic monopoles are constrained to move. It is by hosting the monopole motion that the fractals bequeath the magnetic noise with an anomalous exponent and cause a slow-down of the relaxation. The spatial properties …
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Formation and characterization of zein-based oleogels
… ability to self-assembly into supramolecular structures and eventually lead to continuous networks that involve in the gel formation with non-covalent interactions. In this research, oleogelation mechanism of zein in 70% ethanol and oleic acid mixture was investigated. Zein, a corn prolamin …
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Aggregation Behavior of Chiral Single-Walled Carbon Nanotubes and their Transport in Landfill Conditions
<p>The goal of this study is to systematically investigate the effects of variation in electronic structure on aggregation of chiral single-walled carbon nanotubes (SWNTs) and their transport in landfill conditions. This study involves four key tasks: functionalization of chirally separated SWNTs, …
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Deterministic transport: from normal to anomalous diffusion
… were found to be highly irregular and, in fact, fractal. The main focus in this work is on nonhyperbolic and on intermittent dynamical systems. First, the climbing sine map is considered which is a nonhyperbolic system with many physical applications. Then we treat anomalous dynamics generated by …
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Modelle für die Kleinwinkel-Streuung und Anwendungen
… in this amorphous alloy. Theoretical models of fractal systems are applied to complicated polydisperse materials. Both the theory for an exact surface fractal of Hermann (1994)and the model for coupled volume and surface fractals in the formulation of Wong (1992) are shown to be applicable. The …