Dissertations / Theses on the topic 'Pattern formation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Pattern formation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Parrott, J. A. "Pattern formation in soils." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520596.
Full textSumner, Robert Walker 1975. "Pattern formation in lichen." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86757.
Full textIncludes bibliographical references (p. 73-76).
by Robert Walker Sumner.
S.M.
Bowman, Christopher 1969. "Pattern formation and wavelets." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/288741.
Full textDuran, Nebreda Salvador 1987. "Artificial multicellularity and pattern formation." Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/403584.
Full textThis project has tackled unanswered questions regarding the origins of multicellular life and cooperation using artificial approaches, namely: artificial evolution and synthetic biology. These offer unique opportunities to watch the evolution of complexity unfold and complement the extensively used methods of characterization of extant multicellular systems and theoretical biology. In particular we have proposed new mechanisms to create periodical structures in synthetic systems and how differentiated multicellularity might arise from Darwinian entities.
Katsev, Sergei. "Pattern formation in geochemical systems." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6237.
Full textStannard, Andrew David. "Pattern Formation in Nanostructured Systems." Thesis, University of Nottingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523471.
Full textMcIntyre, Ross. "Pattern formation in nonlinear optics." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/716.
Full textWelford, Chris. "The evolution of pattern formation." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364296.
Full textDenton, Richard Frederick Roger James. "Pattern formation from chemical oscillators." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/13622.
Full textJhugroo, Eric. "Pattern formation in squares and rectangles." Thesis, City, University of London, 2007. http://openaccess.city.ac.uk/18271/.
Full textWang, Lei. "Pattern formation in mesophase carbon fibers." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24045.
Full textCrawford, David Michael. "Analysis of biological pattern formation models." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:aaa19d3b-c930-4cfa-adc6-8ea498fa5695.
Full textRen, Xiaojing, and 任晓晶. "Modeling pattern formation of swimming E.coli." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43704001.
Full textWinterbottom, David Mark. "Pattern formation with a conservation law." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10180/.
Full textCruywagen, Gerhard C. "Tissue interaction and spatial pattern formation." Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:f242b785-9b46-4c21-a789-477b025ce4b3.
Full textCOLOMBO, EDUARDO HENRIQUE FILIZZOLA. "SPATIAL PATTERN FORMATION IN POPULATION DYNAMICS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24777@1.
Full textCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
BOLSA NOTA 10
Motivado pela riqueza de fenômenos produzidos pelos seres vivos, este trabalho busca estudar a formação de padrões espaciais de populações biológicas. De um ponto de vista mesoscópico, definimos os processos básicos que podem ocorrer na dinâmica, construindo uma equação diferencial parcial para a evolução da distribuição da população. Essa equação incorpora duas generalizações de um modelo pre-existente para a dinâmica de um espécie, que leva em conta interações de longo alcance (não locais). A primeira generalização consiste em considerar que a difusão é não linear, isto é, é afetada pela densidade local de tal modo que o coeficiente de difusão segue uma lei de potência. Por outro lado, visto a alta complexidade envolvida na natureza dos parâmetros do modelo, introduzimos como segunda generalização parâmetros que flutuam no tempo. Idealizamos estas flutuações como um ruído descorrelacionado temporalmente e que obedece uma distribuição gaussiana (ruído branco). Para estudar o modelo resultante, utilizamos uma abordagem analítica e numérica. As ferramentas analíticas se baseiam na linearização da equação de evolução e portanto são aproximadas. Todavia, complementadas com resultados numéricos, conseguimos extrair conclusões relevantes. A não localidade das interações induz a formação de padrões. O alcance dessas interações é o que determina o modo dominante presente nos padrões. Assim, para valores dos parâmetros acima de um limiar crítico, emergem padrões. Analiticamente, mostramos que, mesmo abaixo desse limiar, as flutuações nos parâmetros podem induzir a aparição de ordem espacial. Os efeitos da difusão não-linear são captados superficialmente pela análise linear. Numericamente, mostraremos que sua presença modifica a forma dos padrões. Observamos, especialmente, a existência de uma transição quando alternamos entre o caso em que a difusão é facilitada por altas densidades e o caso oposto. Para o primeiro caso, verificamos que os padrões se tornam fragmentados, ou seja, a população é agora composta de sub-grupos desconectados.
Motivated by the richness of phenomena produced by living beings, this work aims to study the formation of spatial patterns in biological populations. From the mesoscopic point of view, we define the basic processes that may occur in the dynamics, building a partial differential equation for the evolution of the population distribution. This equation incorporates two generalizations of a pre-existing model for the dynamics of one species, which takes into account long-range (nonlocal) interactions. The first generalization is to consider that diffusion is nonlinear, i.e., it is affected by the local density such that the diffusion coeficient follows a power law. On the other hand, because of the high complexity involved in the nature of model parameters, we introduced as a second generalization time-fluctuating parameters. We idealize these fluctuations as Gaussian temporally uncorrelated (white) noises. To study the resulting model, we use an analytical and numerical approach. Analytical tools are based on the linearization of the evolution equation and are therefore approximate. However, as evidenced by numerical results, we draw important conclusions. The nonlocal feature of the interaction is the main mechanism which induces pattern formation. We show that the extent of these interactions is what characterizes the dominant mode. Thus, for parameter values above a critical threshold patterns emerge. Analytically, we also show that even below this threshold, fluctuations in the parameters can induce the appearance of spatial order. The effects of nonlinear diffusion are only superficially captured by the linear analysis. Numerically, we show that their presence modifies the patterns shape. We mainly observed the existence of a qualitative difference between the cases when diffusion is facilitated or not by high densities. In the first case, we note that the patterns become fragmented, that is, population becomes composed of disconnected clusters.
Malheiros, Marcelo de Gomensoro. "The mechanochemical basis of pattern formation." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169104.
Full textThis doctoral thesis describes a novel model for coupling continuous chemical diffusion and discrete cellular events inside a biologically inspired simulation environment. Our goal is to define and explore a minimalist set of features that are also expressive, enabling the creation of complex 2D patterns using just a few rules. By not being constrained into a static or regular grid, we show that many different phenomena can be simulated, such as traditional reaction-diffusion systems, cellular automata, and pigmentation patterns from living beings. In particular, we demonstrate that adding chemical saturation increases significantly the range of simulated patterns using reaction-diffusion, including patterns not possible before. Our results suggest a possible universal model that can integrate previous pattern formation approaches, providing new ground for experimentation and realistic-looking textures for general use in Computer Graphics.
Ren, Xiaojing. "Modeling pattern formation of swimming E.coli." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43704001.
Full textSun, Zhiying. "Pattern formation and evolution on plants." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194905.
Full textCondette, Nicolas. "Pattern formation in magnetic thin films." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2011. http://dx.doi.org/10.18452/16336.
Full textThis thesis is concerned with the study of a class of variational problems arising in the context of ferromagnetism. More precisely, it aims at providing a numerical and analytical background to the study of hard magnetic thin films with perpendicular anisotropy. Magnetic thin films are sheets of magnetic materials with thicknesses of a few micrometers down to a few nanometers used mainly in electronic industry, for example as magnetic data storage media for computers. Our initial considerations are based on a model of Landau and Lifshitz that associates the ground states of the magnetization within a three-dimensional body to the minimizers of a nonconvex and nonlocal energy functional, the so-called micromagnetic energy. Under film thickness considerations (thin film regime), we first reduce the aforementioned model to two dimensions and then carry out a Gamma-limit for a sharp-interface model. The resulting energy functional features a competition between an interfacial and a dipolar energy contribution. The second part of the thesis is concerned with the analysis of a numerical method to approximate solutions of the previously derived sharp-interface model. We base our considerations on a relaxed model in which we replace the interfacial energy contribution by its Modica-Mortola approximation, and then study the associated L^2 gradient flow. The resulting evolution equation, a nonlinear and nonlocal parabolic equation, is discretized by a Crank-Nicolson approximation for the time variable and a Fourier collocation method for the space variable. We prove the existence and uniqueness of the solutions of the numerical scheme, the convergence of these solutions towards solutions of the initial continuous model and also derive a-priori error estimates for the numerical method. Finally, we illustrate the analytical results by a series of numerical experiments.
Bose, Sumit. "Pattern formation at semiconductor interfaces and surfaces." [S.l.] : [s.n.], 2001. http://edocs.tu-berlin.de/diss/2000/bose_sumit.pdf.
Full textBeato, Valentina. "Noise-induced pattern formation in excitable media." [S.l.] : [s.n.], 2006. http://opus.kobv.de/tuberlin/volltexte/2007/1419.
Full textMyerscough, Mary Ruth. "A chemotactic model of biological pattern formation." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329983.
Full textMartin, Christopher Paul. "Pattern formation in self-organised nanoparticle assemblies." Thesis, University of Nottingham, 2007. http://eprints.nottingham.ac.uk/10772/.
Full textTse, Dawn Po-Ling. "Spatial period-multiplying bifurcations in pattern formation." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616060.
Full textFeugier, François Gabriel. "Models of vascular pattern formation in leaves." Paris 6, 2006. http://www.theses.fr/2006PA066506.
Full textRinaldi, Matteo. "Dynamics of Phase Separation and Pattern Formation." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/946.
Full textLam, Woon-Kwan. "Pattern formation in non-linear chemical systems." Ann Arbor, Mich. : ProQuest, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3288932.
Full textTitle from PDF title page (viewed Nov. 19, 2009). Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7376. Adviser: Peter K. Moore. Includes bibliographical references.
Isomura, Akihiro. "Spatiotemporal pattern formation in cardiac cell culture." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124393.
Full textBertram, Matthias. "Controlling turbulence and pattern formation in chemical reactions." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964948931.
Full textPlenge, Florian Moritz. "Theory of electrochemical pattern formation under global coupling." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968694535.
Full textMoyles, Iain. "Hybrid asymptotic-numerical analysis of pattern formation problems." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53715.
Full textScience, Faculty of
Mathematics, Department of
Graduate
Da, Rocha Miranda Pontes José. "Pattern formation in spatially ramped Rayleigh-Bénard systems." Doctoral thesis, Universite Libre de Bruxelles, 1994. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212711.
Full textTeng, Jing. "Pattern formation and growth kinetics in eutectic systems." [Ames, Iowa : Iowa State University], 2007.
Find full textRogers, Jeffrey L. "Modulated pattern formation : stabilization, complex-order, and symmetry." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30930.
Full textBates, Wilfred Mark. "Pattern formation in models of charge density waves." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31189.
Full textWe review the microscopic origins of charge density waves, experimental results, and theoretical models of charge density waves. We also review theories of complex systems, and, in particular, the phase organization theory proposed by Tang et al. [87]. We focus on how the phase organization theory applies to the dynamics of charge density waves.
We investigate phase organization in a model of elastically coupled particles subject to a periodic potential and a pulsed driving force. By numerical simulation of the model, we show that the phase organization behaviour is contingent on the existence of a large number of inequivalent metastable configurations in the model. We also show that this model is equivalent to a purely elastic model of charge density waves interacting with impurities.
We further investigate phase organization in a model of charge density waves that has been proposed by Karttunen et al. [99], in which the dynamical generation of phase slips is naturally accounted for. Based on the results of numerical simulations, we argue that phase slips reduce or eliminate the phase organization behaviour of charge density waves by breaking the elasticity of the system.
Lewis, Mark A. "Analysis of dynamic and stationary biological pattern formation." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276976.
Full textMaini, P. K. "On mechano-chemical models for morphogenetic pattern formation." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370285.
Full textThompson, Alasdair Graham. "Lattice models of pattern formation in bacterial dynamics." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/6248.
Full textSiggers, Jennifer Helen. "Pattern formation in a cylinder, and related topics." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619819.
Full textIrvine, Michael Alastair. "Pattern formation and persistence in spatial plant ecology." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/67166/.
Full textHunt, Gordon S. "Mathematical modelling of pattern formation in developmental biology." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2706.
Full textAcharya, Gyanu R. "Electroconvection and Pattern Formation in Nematic Liquid Crystals." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1239804049.
Full textDegen, Michael Merle. "Time-dependent pattern formation in fluid dynamical systems /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu148794815862621.
Full textYang, Xige. "MATHEMATICAL MODELS OF PATTERN FORMATION IN CELL BIOLOGY." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1542236214346341.
Full textArouh, Scott. "Pattern formation and morphology transitions in bacterial systems /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9970683.
Full textMasson, Jean-Loup Didier. "Pattern formation and evolution in thin polymer films." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3034981.
Full textReed, Robert Dale Jr. "The evolution of pattern formation in butterfly wings." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290156.
Full textMulholland, Anthony J. "The Eikonal approach to reaction-diffusion equations in multiply-connected domains." Thesis, Glasgow Caledonian University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359146.
Full textFormosa, Jordan Pau. "Pattern formation through lateral inhibition mediated by Notch signaling." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/116495.
Full textEls organismes multicel·lulars estan constituïts per diferents tipus cel·lulars ordenats d’una certa manera, formant teixits amb funcions específiques. L’organització de cèl·lules de tipus diferents pot donar lloc a patrons espacio-temporals Aquesta Tesi es basa en l’estudi de com a partir d’un teixit de cèl·lules equivalents — estat homogeni precursor — s’estableixen patrons ordenats de tipus cel·lulars diferents. En particular, ens hem centrat en l’estudi d’un tipus de patrons que sorgeixen en teixits animals que tenen dos tipus cel·lulars i que presenten un ordre fi en el teixit, i.e. de longitud d’ona de poques cèl·lules. Aquest tipus de patrons són formats degut al efecte de la inhibició lateral. La inhibició lateral és un fenomen en el qual cèl·lules precursores equivalents intenten adoptar un cert estat o destí cel·lular per a diferenciar-se en un tipus cel·lular en particular, i al mateix temps inhibeixen a les seves cèl·lules veïnes que adquireixin aquest mateix estat. Aquest procés dinàmic dóna lloc a un patró fi, on les cèl·lules que han finalment adoptat l’estat desitjat vénen rodejades per cèl·lules que són inhibides, i que acabaran diferenciant-se en un tipus cel·lular diferent. Aquest tipus de patró es troba en una àmplia varietat de teixits animals, com ara en la retina ,i en l’oïda interna de vertebrats, i en l’ull de la mosca Drosophila.