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Showing 1 to 12 of 12 for “"Diffusion Limited Aggregation"”.
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A renormalization approach to diffusion-limited aggregation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Simulation of Diffusion Limited Aggregation Models and Related Results
… of models of the phenomenon of two-dimensional diffusion limited aggregation, henceforth DLA. The first part proves some generalisations of results relating to Hastings-Levitov with α = 0, henceforth HL(0), another two-dimensional growth process. The second part is a study of numerical …
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Transport-limited aggregation and dense granular flow
… proposed to generalize Laplacian growth such as diffusion-limited aggregation (DLA) and viscous fingering. The fractal properties, crossover in morphology, and relation between continuous and stochastic growth are studied in the context of a representative case, advection-diffusion-limited …
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Non-equilibrium self-assembly processes of complex dipolar colloids
… mechanisms of structure formation and particle aggregation. The experimental systems motivating this work correspond to two prototype non-equilibrium processes, which are lane formation and diffusion limited aggregation. In the case of lane formation it is Janus particles in AC electric fields …
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Assessing the relationship between recurring and nonrecurring traffic congestion
… 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 dimensions. The concepts of …
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Pattern formation in systems far from equilibrium
… model is developed to study the late stages of diffusion-controlled growth. We establish the existence of an asymptotic dense-branching morphology and relate it to the diffusion-limited aggregation. A clear morphological transition from kinetic effect dominated growth to surface tension …
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A study of polyimide films modified with gold
… different morphologies which indicated that a diffusion limited aggregation processes controlled the aggregate growth. The appearance of these aggregates was central to developing a model of phase separation in these metal modified films.
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Adaptable Network Systems
… properties such as self-organization governed by diffusion limited aggregation, distributed plasticity, robustness which gives rise to redundant pathways, and 3D connectivity. Additionally, this work examines the slime mold Physarum polycephalum, whose transport networks inspire efficient and …
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Fluctuations and mixing for planar random growth
We study two models of random growth by aggregation on the plane, which turn out to share similar asymptotic features. The first part of this thesis focuses on the Hastings-Levitov model HL(0), according to which clusters of particles are built on the complex plane by iterated composition of random …
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Controlling Viscous Fingering
… profiles on the development of instability. Diffusion Limited Aggregation (DLA) simulations are performed for comparison. In all cases, the evolving pattern has a saturation distribution, with an inner zone in which the fingers are static and an outer zone in which the fingers advance and …
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Magnetic Manipulation and Assembly of Multi-component Particle Suspensions
… and this effect was attributed to particle aggregation which is inherent in these systems. In nearly all cases, these interactions caused the ferrofluid to behave as though the nanoparticles were clustered with an effective diameter about twice the real diameter.</p><p> The principle purpose …
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Understanding and controlling the reactivity of oxygen reduction and methanol oxidation electrocatalysts
… 20 µm and tip-splitting growth structure due to diffusion-limited aggregation on Pt-P1 and Pt-PLA. Characterization using X-ray photoemission spectroscopy (XPS) and X-ray diffraction (XRD), combined with Rietveld refinement analysis reveal a trend of downshifted d-band center, increased …