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 20 of 151 for “"Pattern formation"”.
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Pattern formation in lichen
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Pattern Formation in Active Nematics
… diagram that identifies the various emergent patterns as a function of activity and nematic stiffness. In Chapter 4 we compare results obtained with two distinct hydrodynamic models that have been employed in previous studies. In both models we find that the chaotic spatio-temporal dynamics in …
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Pattern formation in geochemical systems.
Compositional patterns are extremely common in natural minerals. While, in many cases, variations in the solid mineral composition reflect the external changes in the environment at the time of the mineral formation, the role of self-organization is increasingly acknowledged. For example, in …
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Pattern formation in oscillatory systems
Synchronization is a kind of ordinary phenomenon in nature, the study of it includes many mathematical branches. Phase space is one of the most powerful inventions of modern mathematical science. There are two variables, the position and velocity, that can describe the 2-dimensional phase space …
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Pattern formation in squares and rectangles
This thesis considers pattern formation governed by the two dimensional Swift-Hohenberg equation in square and rectangular domains. For the square, the dependence of the solution on the size of the square relative to the characteristic wavelength of the pattern is investigated for periodic, …
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Pattern Formation During Extensive Cell Movements
… develop, they are required to generate organised patterns of gene expression across developing tissues. Previous hypotheses used to explain how patterns form in developing tissues have relied on the ideas of positional information and gradients of signalling across the developing tissue, which …
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Self-organized Pattern Formation using Engineered Bacteria
… mechanisms have been proposed to explain natural pattern formation processes, such as slime mold aggregation, feather branching, and tissue stratification. Regardless of the specific molecular interactions, the vast majority of these mechanisms invoke morphogen gradients, which are either …
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Pattern formation in systems far from equilibrium
… problems related to the dynamics of pattern formation in non-linear, dissipative systems far from equilibrium. The first problem addresses the dynamical mechanism of velocity and shape selection in dendritic crystal growth. Using the boundary-layer model of solidification, we …
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Pattern Formation in Certain Classical and Quantum Systems
<p>My research predominantly focuses on micromagnetic simulations of cobalt nanoparticles. These simulations are carried out by using the Object-Oriented MicroMagnetic Framework: OOMMF) distributed by the National Institute of Standards and Technology: NIST). In performing these simulations, …
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INTRACELLULAR PATTERN FORMATION OF F-BAR PROTEIN FBP17
Living cells exhibit various dynamic biological patterns in the forms of waves and oscillations. Increasing attention is paid to their functions in efficient and robust signal transduction. However, whether plasma membrane plays an active role in wave propagation remains to be answered. In this …
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Scaling and Pattern Formation in Condensed Matter Systems
Finally, I study multiscale patterns in polycrystalline materials, with the phase field crystal (PFC) model. I first show that the complex amplitudes representation incorporates the correct form of nonlinear elasticity. I then analyze the plastic properties of the model by applying a shearing …
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Mechanochemical pattern formation in the cellular actomyosin cortex
Protein patterning is essential for cellular function. From cell division to cell migration, specific positional and temporal arrangement of proteins are requisite to triggering and executing vital cell processes. In the aforementioned examples and many other fundamental cellular activities, …
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Pattern formation in fluid injection into dense granular media
… the fundamental failure mechanisms and flow patterns involved in the process of fluid injection into dense granular media. The experimental work is conducted with aqueous glycerin solutions, utilizing a novel setup based on a Hele-Shaw cell filled with dense dry sand. The two dimensional …
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Pattern formation and essential responses for regeneration in planarians
… all tissues after injury, involving stem cells, patterning cues and a set of cellular and molecular responses collectively called the "missing tissue" or "regenerative" response. The missing tissue response has long been considered a fundamental requirement of planarian regeneration. follistatin, …
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Pattern formation through synchronization in systems of nonidentical autonomous oscillators
… of the coupling plays an important role for the formation of patterns. We have studied the ordering influence of an asymmetry (non-isochronicity) in the phase coupling function on the phase profile in synchronization and the intricate interplay between this asymmetry and the frequency …
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Non-Equilibrium Pattern Formation in Multi-Species Interacting Particle Systems
Non-equilibrium systems can form complex patterns in their steady states. Examples are systems consisting of self-propelled particles or systems consisting of particles driven away from equilibrium by external energy sources. In steady states, the interacting particles spontaneously organise into …
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Drying of colloidal suspension drops : pattern formation and mechanical deformation
… on a hydrophilic substrate leads to the formation of a close-packed solid particle deposit. The initial volume fraction of particles sets the shape and size of this deposit, from a ring at the edge of the drop to a solid film covering the initial wetted area. We show that this deposit …
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Nanopore/Nanotube Pattern Formation through Focused Ion Beam Guided Anodization
… structures. In this work, focused ion beam patterning method is introduced to general anodization, aiming to make highly ordered anodic porous alumina and titania nanotubes. Focused ion beam guided porous anodic alumina is carried out by pre-designing hexagonal and square guiding patterns …
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