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 32 for “"collective motion"”.
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Collective Motion in Spatially Heterogeneous Environments
… investigates how spatial constraints influence collective motion through agent-based modeling and empirical analysis of animal behavior. We study how obstacles affect flocking, developed an agent-based model of bat flight from experimental data, and explored a model-free classification tool for …
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On the irreversibility of collective motion in polar active matter
• Chapter 1 – Introduction to the contents and main results of the thesis. • Chapter 2 – Review of Itô and Stratonovich calculus, stochastic thermodynamics, (stochastic) entropy production, time-reversal symmetry, the principle of detailed balance, Sekimoto’s stochastic energetics and spherical …
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Models and simulations of collective motion in biomimetic robots and bacteria
In nature, one finds many examples of collective motion, from flocking birds to swarming bees. Any one organism makes its decisions based solely on local information; either it can sense what its close neighbors are doing, or in the case of a single-celled organism, it can sense some local property …
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The Role of Sensing Modalities in Shaping Collective Motion and Group Behavior
<p>Collective behavior refers to the coordinated movements that emerge from simple interactions between individuals within a group. Traditionally, researchers have modeled these interactions assuming individuals can sense their surroundings in all directions, like having eyes all around their …
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Modelling collective motion in animals and the impact of underlying social networks
Nature is rich with examples of the collective motion of animal groups, such as flocks of birds or shoals of fish. The mechanisms of self-organization resulting in these spectacular phenomena have received wide attention. Individual-based models are a popular and promising approach to investigate …
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Investigation of viscosity effects on bacteria collective motion using particle image velocimetry
Swimming bacteria are known to display collective motion resulting from their flagella propulsion. Various models of such collective behavior have been proposed, and different motion patterns are also well-documented. However, no previous research has investigated how contrasts in fluid viscosity …
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Effects of Non-uniform Gaussian Curvature on the Collective Motion of Active Particles
… to understand the effects of curvature on their collective behaviour. There are a wide range of active systems that move on curved surface, for example, cells in crypts in the gut, vortex patterns in the mammalian cornea or actively driven microtubule bundles on a droplet.<br/><br/>Following a …
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Sensemble : a wireless inertial sensor system for the interactive dance and collective motion analysis
… inertial sensors to create a wearable, wireless, motion analysis system meeting the demands of many points of measurement and high data rates. This thesis outlines the implementation of such a system intended for interactive dance, in which sensor nodes are worn on the wrists and ankles of dancers …
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Biological Physics of Collective Motion: Circular Milling in Symsagittifera roscoffensis and Related Questions of Self-Organisation
Collective motion, a phenomenon resulting from the interactions of many individuals, occurs across the natural world across all length scales, from the flocking of birds to the swirling of Bacillus subtilis bacteria. Understanding these phenomena is critical to understanding how the organism …
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From individual to collective motion of self-propelled particles: The role of particle shape, orientational ordering and clustering
Diese Arbeit untersucht das Verhalten von aktiven getriebenen Teilchen, d. h. Teilchen, die sich unter Verbrauch von Energie gerichtet mit einer gegebenen Geschwindigkeit fortbewegen. Solche Teilchen sind per Definition fernab vom thermodynamischen Gleichgewicht und unterliegen daher nicht dem …
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Cell-cycle dependent motility of Chlamydomonas reinhardtii and its collective motion in response to a Hagen-Poiseuille flow
… variation has direct consequences on the collective motion of algal cells in a Hagen–Poiseuille flow, a relevant component flow for air-lift photobioreactors. The cell number density profiles were calculated by an individual-based simulation and a continuum system inclusive of the buoyancy …
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Mathematical and Computational modelling of soft and active matter
The collective motion of organisms such as flights of birds, swimming of school of fish, migration of bacteria and movement of herds across long distances is a fascinating phenomenon that has intrigued man for centuries. Long and details observations have resulted in numerous abstract hypothesis …
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Theory and simulations of confined active suspensions
… regime are known to give rise to collective motion and large-scale spatiotemporal coherent patterns. The mechanisms behind the emergence of collective dynamics and self-organization from individual interactions has received increasing attention in the past few years, and could …
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Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
… form of PDW, responds to incident light. The collective motion of the condensate plays a key role; gauge invariance guides us to the correct result. From Chapter 3 to Chapter 7, we construct a pseudogap metallic state by considering quantum fluctuating PDW. We analyze a recent scanning …
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Molecular dynamics simulations and neural network solutions for applications in biophysics
… neural network method (NNM). Specifically, the collective motion of ensembles of bacterial twitchers, the structure and dynamics of a phytoglycogen nanoparticle, and nanoparticle mobility through the slit-well microfluidic device are studied using MD. In each of these applications, varying …
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Particles methods for kinetic equations in plasma physics, collective behaviors and optimization.
… a follower-leader kinetic model to simulate the collective motion of birds. We will show how it is possible to improve the efficiency of classical stochastic algorithms in presence of non locality. In Chapter 4 we will consider a similar setting in the context of optimization and we will develop …
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Thermodynamics of Biological Active Matter
… active matter shows rich physical behaviors from collective motion to phase separation and serves as the focal point for addressing fundamental questions in nonequilibrium physics, ecology as well as animal behavior. Despite the diverse phenomena observed from active matter, they all share a …
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Confinement-mediated accumulation and collective dynamics of microswimmers
… accumulation, clustering, and even large-scale collective flows including at moderate concentrations. Following experimental work (either done by us or our collaborators), as well as existing literature, we build theoretical models and simulations based on hydrodynamic singularities and steric …
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Rheology and Collective Behavior in Living Tissue
… themselves to a fluid state in order to promote collective motion? Has evolution made use of the ability of tissues to tune themselves between fluid and solid states in programming the complex steps leading from the embryo to the organism? Here we describe our recent e↵orts to answer such …
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Crystalline Protein Dynamics : A Simulation Analysis of Staphylococcal Nuclease
Understanding motions in protein crystals is likely to furnish insight into functional protein dynamics and will improve models for refinement against diffraction data. In this thesis, molecular dynamics (MD) simulations of crystalline Staphylococcal nuclease are reported and analysed in terms of …
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