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 42 for “"active matter"”.
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Thermodynamics of Biological Active Matter
… a fuel at the individual particle level, 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 …
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Self-organisation of confined active matter
Active matter theory studies the collective behaviour of self-propelled organisms or objects. Although the field has made great progress in the past decade, little is known of the role played by confinement and surfaces. This thesis analyses the self-organisation of dense bacterial suspensions in …
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Non-equilibrium phase separation in active matter
Active matter, characterised by the ability to inject energy into the environment locally, forms an important class of non-equilibrium systems. Recently there has been a surge of interest in active systems with chemical reactions, fuelled in particular by studies in biomolecular condensates, or …
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Geometric and Topological Aspects of Soft & Active Matter
… geometric ideas are now a mainstay of condensed matter physics, underlying much of our understanding of conventional materials in terms of defects and geometric frustration in ordered media, and protected edge states in topological insulators. In this thesis, I will argue that such an approach …
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Investigating non-equilibrium phenomena in active matter systems
Active matter systems have very recently received a great deal of interest due to their rich emergent non-equilibrium behavior. Some of the most vital and ubiquitous biological systems and processes are active matter systems including reproduction, wound healing, dynamical adaptation, chemotaxis, …
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Learning and investigating phenomenological models for active matter
Active matter, such as a suspension of swimming cells or colloidal particles, or even a flock of birds, consists of self-propelled units that convert stored or ambient free energy into motion. Recent advances in high-resolution imaging techniques and particlebased simulation methods have enabled …
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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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A method for detecting nonequilibrium dynamics in active matter
Active force generation is an important class of out-of-equilibrium activity in cells. These forces play a crucial role in vital processes such as tissue folding, cell division and intracellular transport. It is important to determine the extent of such nonequilibrium activity during cellular …
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Active matter for removal of biofilm and endocrine-disrupting chemicals
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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On the irreversibility of collective motion in polar active matter
… analytical and numerical results on the ‘Active XY model’ (AXYM), including a linear stability analysis of the polar liquid phase of the AXYM and ‘non-extensive AXYM’ (NeAXYM). This work has been done under the supervision of Michael E. Cates. Sections 4.4 and 4.6 contain numerical …
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Mind the Matter: Active Matter, Basal Cognition, and the Making of Bio-Inspired Artificial Intelligence
… this thesis, I pull from recent developments in Active Matter Physics, Basal Cognition, and Bio-Inspired A.I. to argue that this conception of materiality and physicality needs to be reworked to reflect the state-of-the-art. When we pivot away from a conception of materiality as entailing …
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Motility-induced phases: out-of-equilibrium droplets, surfaces, and survival
<p>Active matter represents a unique kind of out-of-equilibrium matter that is endowed with motility, the ability of each individual unit to move according to its own self-propulsion force. Objects of study in active matter include entities like birds and cells, which become particularly …
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Matter in motion: The problem of activity in seventeenth-century English matter theory
… tried to account for the various motions of matter which played such a fundamental role in their philosophies. It argues that the Cartesian mechanical philosophy, in which matter is considered to be completely passive and inert and the amount of motion in the universe is constant (being …
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Hydrodynamic behaviour of active and multi-species exclusion processes
… exclusion on large-scale collective behaviour in active and multi-species systems. We first focus on the effects of volume exclusion using the method of matched asymptotics on a multi-species exclusion process. This results in a cross-diffusion system of partial differential equations (PDEs) that …
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Active Vertex Model of Epithelial Monolayer Mechanics
An Active Vertex Model (AVM) for cell-resolution studies of the mechanics of confluent epithelial tissues consisting of tens of thousands of cells, with a level of detail inaccessible to similar methods is presented. The AVM combines the Vertex Model for confluent epithelial tissues with active …
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Modelling and inference in active systems
Non-equilibrium systems, or active systems, span virtually all disciplines of science. While the underlying processes driving these systems out of equilibrium (may that be thermal, chemical or another type of equilibrium) may be entirely unrelated, it is often the case that the same or a similar …
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Aspects of Parity Breaking in Classical and Quantum Fluids
… breaking are perhaps most strikingly seen in active matter, systems of complex particles that tend to convert energy into some directed mechanical motion. Within a fluid description additional transport coefficients arise, beyond shear viscosity, which capture the parity broken nature of the …
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Collective structure and dynamics of colloids far-from equilibrium
… conventional equilibrium framework of thinking, active matter opens a new direction for non-equilibrium physics, relevant or irrelevant to life. Without the simple rule to minimize free energy toward equilibrium, it is challenging to predict theoretically and study experimentally how a system …
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The Effects of DEAD-box Helicase Activity on Biomolecular Condensate Structure and Dynamics
… condensates, and physicists interested in active materials. In this work, we study how DEAD-box helicases dictate condensate structure and dynamics via their enzyme-dependent RNA interactions and RNA remodeling activity. First, we show how a DEAD-box helicase’s nucleotide dependent …
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Work, power, and resetting statistics in stochastic models of physical systems under drive
… classical thermodynamics, which instead uses an active fluid as its working medium. Due to the driving at the level of the active constituents, there is a constant energy flux in this system, some of which can be transferred to useful work even at a single thermostat temperature. I explicitly …
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