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Dissertations / Theses on the topic 'Fractal modelling'

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Published: 4 June 2021
Last updated: 2 November 2024

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1

Sharma, A. "Modelling biological systems: a fractal approach." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1991. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3009.

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2

Gregotski, Mark Edward. "Fractal stochastic modelling of airborne magnetic data." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74300.

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Airborne magnetic field data exhibit downward continued power spectra of the form $1/f sp beta$ (where f is the spatial frequency and $ beta$ is a non-negative real number). This form of spectrum is observed for magnetic data recorded over a range of sampling scales from various areas of the Canadian Shield. Two scaling regimes have been discovered. The first has a $ beta$ value near 3 for wavelengths $ sbsp{ sim}{$25 km. These results suggest a "variable fractal" description of the distribution of near-surface magnetic sources.<br>From a data modelling viewpoint, the magnetic measurements are
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3

Nilsen, Christopher. "Fractal modelling of turbulent flows : Subgrid modelling for the Burgers equation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13916.

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The stochastically forced Burgers equation shares some of the same characteristics as the three-dimensional Navier-Stokes equations. Because of this it is sometimes used as a model equation for turbulence. Simulating the stochastically forced Burgers equation with low resolution can be considered as a one dimensional model of a three-dimensional large eddy simulation, and can be used to evaluate subgrid models. Modified versions of subgrid models using the fractal interpolation technique are presented here and tested in low resolution simulations of the stochastically forced Burgers equations.
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4

Lauren, Michael Kyle. "The fractal modelling of turbulent surface-layer winds." Thesis, University of Auckland, 1999. http://hdl.handle.net/2292/1106.

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Multiscaling analysis and cascade simulation techniques, which form part of the more general field of fractals, are introduced as a method for characterising and simulating surface-layer winds, particularly for time scales associated with the energy-containing range. This type of analysis consists of determining the power-law parameter of the spectrum of the data, and the scaling of the statistical moments. These techniques were applied to determine how the statistics depended on the duration (or scale) of the fluctuations in wind speed, the atmospheric conditions, and the topography of the si
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5

Kentwell, D. J. "Fractal relationships and spatial distribution of ore body modelling." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 1997. https://ro.ecu.edu.au/theses/882.

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The nature of spatial distributions of geological variables such as ore grades is of primary concern when modelling ore bodies and mineral resources. The aim of any mineral resource evaluation process is to determine the location, extent, volume and average grade of that resource by a trade off between maximum confidence in the results and minimum sampling effort. The principal aim of almost every geostatistical modelling process is to predict the spatial variation of one or more geological variables in order to estimate values of those variables at locations that have not been sampled. From t
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6

Vera, Epiphany. "Fractal modelling of residual in linear predictive coding of speech." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ41642.pdf.

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7

Arfeen, Muhammad Asad. "Contributions to modelling of internet traffic by fractal renewal processes." Thesis, University of Canterbury. Department of Computer Science & Software Engineering, 2014. http://hdl.handle.net/10092/10194.

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The principle of parsimonious modelling of Internet traffic states that a minimal number of descriptors should be used for its characterization. Until early 1990s, the conventional Markovian models for voice traffic had been considered suitable and parsimonious for data traffic as well. Later with the discovery of strong correlations and increased burstiness in Internet traffic, various self-similar count models have been proposed. But, in fact, such models are strictly mono-fractal and applicable at coarse time scales, whereas Internet traffic modelling is about modelling traffic at fine and
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8

Yasrebi, Amir Bijan. "Determination of an ultimate pit limit utilising fractal modelling to optimise NPV." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/18449.

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The speed and complexity of globalisation and reduction of natural resources on the one hand, and interests of large multinational corporations on the other, necessitates proper management of mineral resources and consumption. The need for scientific research and application of new methodologies and approaches to maximise Net Present Value (NPV) within mining operations is essential. In some cases, drill core logging in the field may result in an inadequate level of information and subsequent poor diagnosis of geological phenomenon which may undermine the delineation or separation of mineralis
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9

Bonsu, Kofi. "Urban hierarchy and the analysis of spatial patterns : towards explicit fractal modelling." Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2021.

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La thèse vise à explorer le potentiel des résultats empiriques dans l'identification des centres et sous-centres urbains en utilisant des données accumulées extraites d'images de télédétection et d'analyses fractales disponibles gratuitement. Il répond au défi de l’indisponibilité des données dans ce contexte. Bien que diverses méthodes aient été utilisées dans la littérature, telles que le seuil minimum, les méthodes statistiques spatiales et la méthode des prix hédoniques, celles-ci sont principalement basées sur le contexte local des pays développés, avec des études limitées axées sur les p
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10

Wohlberg, Brendt. "Fractal image compression and the self-affinity assumption : a stochastic signal modelling perspective." Doctoral thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/9475.

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Bibliography: p. 208-225.<br>Fractal image compression is a comparatively new technique which has gained considerable attention in the popular technical press, and more recently in the research literature. The most significant advantages claimed are high reconstruction quality at low coding rates, rapid decoding, and "resolution independence" in the sense that an encoded image may be decoded at a higher resolution than the original. While many of the claims published in the popular technical press are clearly extravagant, it appears from the rapidly growing body of published research that frac
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11

Cottet, Arnaud J. "Modelling of ceramic matrix composite microstructure using a 2-D fractal spatial particle distribution." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/12928.

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12

Chang, Che-Cheng Bryant. "Design and Topology Optimisation of Tissue Scaffolds." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14161.

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Tissue restoration by tissue scaffolding is an emerging technique with many potential applications. While it is well-known that the structural properties of tissue scaffolds play a critical role in cell regrowth, it is usually unclear how optimal tissue regeneration can be achieved. This thesis hereby presents a computational investigation of tissue scaffold design and optimisation. This study proposes an isosurface-based characterisation and optimisation technique for the design of microscopic architecture, and a porosity-based approach for the design of macroscopic structure. The goal of thi
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13

McClean, Colin John. "The scale-free and scale-bound properties of land surfaces : fractal analysis and specific geomorphometry from digital terrain models." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/5999/.

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The scale-bound view of landsurfaces, being an assemblage of certain landforms, occurring within limited scale ranges, has been challenged by the scale-free characteristics of fractal geometry. This thesis assesses the fractal model by examining the irregularity of landsurface form, for the self-affine behaviour present in fractional Brownian surfaces. Different methods for detecting self-affine behaviour in surfaces are considered and of these the variogram technique is shown to be the most effective. It produces the best results of two methods tested on simulated surfaces, with known fractal
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14

Sithebe, Nomcebo Princess. "Flocculation modelling of differential sedimentation based on fundamental physics of settling particles and fractal theory." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40841.

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Sedimentation is a fundamental operation in wastewater treatment works. A rational design of sedimentation tanks is currently achieved by plotting iso-percentile (iso-percentage) concentration removal profiles from flocculent settling data. A major drawback of the graphical iso-percentage method is that the iso-percentile lines are often manually interpolated and are mere hand drawn estimations. This is because the settling behaviour of sludge particles is highly non-linear. The manual analytical process is therefore very tedious, inaccurate and subjective. Hence, an optimised design of
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15

Geiselhart, Karin, and n/a. "Does democracy scale?: a fractal model for the role of interactive technologies in democratic policy processes." University of Canberra. Information Management and Tourism, 1999. http://erl.canberra.edu.au./public/adt-AUC20050628.122941.

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The development of interactive communication technologies, such as email and the Internet, has stimulated much discussion about their potential to assist in the renewal of democracy. Globalisation, intimately connected with technological advance, has likewise led to considerations of 'governance' that transcend the nation state. This thesis poses the general question: Can the efficiencies and economies which drive commercial applications of interactive technology be applied to democratic policy processes? What conditions will facilitate this? The perspective taken here views policy as a commun
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16

Treifi, Muhammad. "Fractal-like finite element method and strain energy approach for computational modelling and analysis of geometrically V-notched plates." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/fractallike-finite-element-method-and-strain-energy-approach-for-computational-modelling-and-analysisof-geometrically-vnotched-plates(93e63366-8eef-4a29-88a4-0c89cf13ec1f).html.

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The fractal-like finite element method (FFEM) is developed to compute stress intensity factors (SIFs) for isotropic homogeneous and bi-material V-notched plates. The method is semi-analytical, because analytical expressions of the displacement fields are used as global interpolation functions (GIFs) to carry out a transformation of the nodal displacements within a singular region to a small set of generalised coordinates. The concept of the GIFs in reducing the number of unknowns is similar to the concept of the local interpolation functions of a finite element. Therefore, the singularity at a
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17

Madison, Guy. "Functional modelling of the human timing mechanism." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5012-1/.

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18

Zabzina, Natalia. "Mathematical modelling approach to collective decision-making." Doctoral thesis, Uppsala universitet, Tillämpad matematik och statistik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-314903.

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In everyday situations individuals make decisions. For example, a tourist usually chooses a crowded or recommended restaurant to have dinner. Perhaps it is an individual decision, but the observed pattern of decision-making is a collective phenomenon. Collective behaviour emerges from the local interactions that give rise to a complex pattern at the group level. In our example, the recommendations or simple copying the choices of others make a crowded restaurant even more crowded. The rules of interaction between individuals are important to study. Such studies should be complemented by biolog
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19

Kuklik, Robert G. "Capital Asset Prices Modelling - Concept VAPM." Doctoral thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-196945.

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The key objective of this thesis is the outline of an alternative capital market modeling framework, the Volatility Asset Pricing Model, VAPM, inspired by the innovative dual approach of Mandelbrot and Hudson using the method based on synthesis of two seemingly antagonistic factors -- the volatility of market prices and their serial dependence determining the capital markets' dynamics. The pilot tests of this model in various periods using the market index as well as a portfolio of selected securities delivered generally satisfactory results. Firstly, the work delivers a brief recapitulation r
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20

Mishkinis, Anton. "Extension des méthodes de géométrie algorithmique aux structures fractales." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00991384.

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La définition de formes par ces procédés itératifs génère des structures avec des propriétésspécifiques intéressantes : rugosité, lacunarité. . . . Cependant, les modèles géométriques classiquesne sont pas adaptés à la description de ces formes.Dans le but de développer un modeleur itératif pour concevoir des objets fractals décrits à l'aide duBCIFS, nous avons développé un ensemble d'outils et d'algorithmes génériques qui nous permettentd'évaluer, de caractériser et d'analyser les différentes propriétés géométriques (la localisation, lecalcul de l'enveloppe convexe, de la distance à partir d'
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21

Maritan, Amos. "Topics on Static and Dynamic Properties of Fractals." Doctoral thesis, SISSA, 1985. http://hdl.handle.net/20.500.11767/4595.

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22

Islam, Zahurul. "Fractals and fuzzy sets for modelling the heterogenity and spatial complexity of urban landscapes using multiscale remote sensing data." Thesis, Curtin University, 2004. http://hdl.handle.net/20.500.11937/623.

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This research presents models for the analysis of textural and contextual information content of multiscale remote sensing to select an appropriate scale for the correct interpretation and mapping of heterogeneous urban land cover types. Spatial complexity measures such as the fractal model and the Moran’s I index of spatial autocorrelation were applied for addressing the issue of scale, while fuzzy set theory was applied for mapping heterogeneous urban land cover types. Three local government areas (e.g. the City of Perth, the City of Melville and the City of Armadale) of the Perth metropolit
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23

Islam, Zahurul. "Fractals and fuzzy sets for modelling the heterogenity and spatial complexity of urban landscapes using multiscale remote sensing data." Curtin University of Technology, Department of Spatial Sciences, 2004. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15414.

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This research presents models for the analysis of textural and contextual information content of multiscale remote sensing to select an appropriate scale for the correct interpretation and mapping of heterogeneous urban land cover types. Spatial complexity measures such as the fractal model and the Moran’s I index of spatial autocorrelation were applied for addressing the issue of scale, while fuzzy set theory was applied for mapping heterogeneous urban land cover types. Three local government areas (e.g. the City of Perth, the City of Melville and the City of Armadale) of the Perth metropolit
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24

Adegoke, Elijah. "Radio frequency channel characterization for energy harvesting in factory environments." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/33412.

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This thesis presents ambient energy data obtained from a measurement campaign carried out at an automobile plant. At the automobile plant, ambient light, ambient temperature and ambient radio frequency were measured during the day time over two days. The measurement results showed that ambient light generated the highest DC power. For plant and operation managers at the automobile plant, the measurement data can be used in system design considerations for future energy harvesting wireless sensor nodes at the plant. In addition, wideband measurements obtained from a machine workshop are present
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25

Lagree, Bertrand. "Modelling of two-phase flow in porous media with volume-of-fluid method." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066199/document.

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La compréhension des écoulements multiphasiques en milieu poreux revêt une importance capitale dans de nombreuses applications industrielles et environnementales, à des échelles spatiales et temporelles variées. Par conséquent, la présente étude propose une modélisation des écoulements multiphasiques en milieu poreux par le biais de la méthode Volume de Fluide, et présente des simulations de digitations de Saffman-Taylor, motivées par l'analyse d'expériences de balayage dans des blocs de grès de Bentheimer quasi bidimensionnels initialement saturés en huile extra-lourde par de l'eau. Le code G
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26

Lanaro, Flavio. "Geometry, Mechanics and Transmissivity of Rock Fractures." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3168.

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27

Stacey, Geoff. "Stochastic fractal modelling of dielectric discharges." 1995. http://hdl.handle.net/1993/19010.

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28

Wang, Zhijing. "GIS-based fractal/multifractal modelling of texture in mylonites and banded sphalerite ores /." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR46019.

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Thesis (Ph.D.)--York University, 2008. Graduate Programme in Earth and Space Science and Engineering.<br>Typescript. Includes bibliographical references (leaves123-134). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR46019
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29

Akinlabi, Emmanuel Olutayo. "Analysis and Modelling of Small-Scale Turbulence." Doctoral thesis, 2020. https://depotuw.ceon.pl/handle/item/3669.

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The analysis and modelling of small-scale turbulence in the atmosphere play a significant role in improving our understanding of cloud processes, thereby contributing to the development of better parameterization of climate models. Advancement in our understanding of turbulence can be fueled from a more in-depth study of small-scale turbulence, which is the subject of this thesis. Within this thesis, small scales are understood as turbulent structures affected by viscosity as well as scales from the highwavenumber part of the inertial range which are of O(0.1m−1m) typically neglected in numeri
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30

Arendt, Lawrence H. "Stochastic modelling and multifractal characterization of dielectric discharges using Laplacian fractals." 1996. http://hdl.handle.net/1993/19113.

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31

ARRIGHETTI, Walter. "Mathematical models and methods for Electromagnetism on fractal geometries." Doctoral thesis, 2007. http://hdl.handle.net/11573/1656088.

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This work summarizes the research path done by Walter Arrighetti during his three years of Doctorate of Research in Electromagnetism at Università degli Studi di Roma “La Sapienza,” Rome, under the guidance of Professor Giorgio Gerosa. This work was mainly motivated by the struggle to find simpler and simpler models to introduce complex geometries (like fractal ones, for example, which are complicated but far from being ‘irregular’) in physical field theories like the Classical Electrodynamics, and which stand at the base of most contemporary applied research activities: from antennas (of any si
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32

ARRIGHETTI, Walter. "Mathematical models and methods for Electromagnetism on fractal geometries." Doctoral thesis, 2007. http://hdl.handle.net/11573/1656600.

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This work summarizes the research path done by Walter Arrighetti during his three years of Doctorate of Research in Electromagnetism at Università degli Studi di Roma “La Sapienza,” Rome, under the guidance of Professor Giorgio Gerosa. This work was mainly motivated by the struggle to find simpler and simpler models to introduce complex geometries (like fractal ones, for example, which are complicated but far from being ‘irregular’) in physical field theories like the Classical Electrodynamics, and which stand at the base of most contemporary applied research activities: from antennas (of any si
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33

Cordeiro, Margarida Machado. "Permeation of Weak Acids and Bases Through Lipid Bilayers – Modelling and Validation of a pH Variation Assay." Master's thesis, 2022. http://hdl.handle.net/10316/99393.

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Dissertação de Mestrado em Química apresentada à Faculdade de Ciências e Tecnologia<br>A descoberta e desenvolvimento de fármacos é um processo iterativo e muito complexo. A insuficiente absorção, distribuição, eliminação, eficácia e segurança dos candidatos a fármacos são os principais obstáculos no desenvolvimento de novas terapias. As membranas lipídicas são a principal barreira à difusão dos solutos e determinam a disponibilidade destes compostos nos tecidos. Prever a velocidade de permeação de solutos in vivo é crucial, e existem vários estudos in vitro para entender e quantificar esse pr
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