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 48 for “"Slow dynamics"”.
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Structure, slow dynamics, kinetic arrest, and massively reconfigurable assembly in colloidal suspensions
… Chapters 2 through 5 focus predominantly on slow dynamics, kinetic arrest and non-equilibrium soft solid properties and their unique applications. In Chapter 2 we explore the subtle interplay between colloidal liquid-gas macrophase separation, percolation, kinetic arrest, and space spanning …
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Theories of slow dynamics: from glassy colloidal suspensions to entangled macromolecular liquids
Motivated by the intriguing slowing down of dynamics in glassy and polymeric fluids, microscopic theories for the dynamical behavior of these systems are explored. Of particular interest is the relative importance of equilibrium structure and topological constraints on system dynamics, and theories …
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Slow dynamics in supercooled liquids : matrix formalism, mode coupling and glass transition
In this thesis, slow dynamics of supercooled liquids are investigated in the framework of the mode-coupling theory (MCT). Following the real-time generalized Langevin equation in Newtonian liquids, the dynamic Gaussian factorization scheme leads to mode-coupling (MC) closures. As an alternative …
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Theory of Slow Dynamics and Barrier Hopping in Colloidal Suspensions and Polymer Melts
The theory is extended to polymer melts based on a coarse-grained model in which the melt is treated as a liquid of segments. The barrier is predicted to be a function of a single parameter that is chemical structure, temperature and pressure dependent. Qualitative agreement with experiment is …
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Learning-Based Pareto Optimal Control of Large-Scale Systems with Unknown Slow Dynamics
… where decision makers know only their local dynamics. Using reinforcement learning, we design a control strategy that optimally balances multiple objectives. The proposed method achieves near-optimal performance and scales well with the total dimension of the system. Experimental results …
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Investigation of Slow Dynamics in Proteins: NMR Pulse Sequence Development and Application in Triosephosphate Isomerase
The dynamics of proteins on the millisecond time scale are on the same time scale as typical catalytic turnover rates, and can sometimes be closely related to enzymes' functions. Solid state NMR, equipped with magic angle spinning, is a very good technique to detect such millisecond dynamics, …
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Study of slow dynamics in supercooled water by molecular dynamics and quasi-elastic neutron scattering
The slow dynamics of supercooled water is studied by modelling the spectrum of test particle fluctuations: intermediate scattering function (ISF). The theoretical models are compared with experimental measurements by quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulation …
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Shape and chemically anisotropic colloidal particles: A theoretical study of their structure, phase behavior, and slow dynamics
… state diagram presents qualitatively different dynamics in different regimes. They are qualified by the different behaviors of the NLE dynamic free energy. The caging dominated, repulsive glass regime is characterized by long localization lengths and barrier locations, dictated by repulsive hard …
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Investigation of rare events and slow dynamics in atomic and molecular liquids and glasses using ascent dynamics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Phase Behavior, Fluid Structure, and Slow Dynamics in Polymer -Colloid Mixtures: Novel Liquid State Theory and Its Applications
"Collective colloid structure predictions agree quantitatively with scattering experiments over length scales of D-10D in the fluid phase. The theory captures the non-monotonic changes in the local cage order parameter S(k* ≈ 7 D) with increasing polymer concentrations. Accurate, no adjustable …
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Theoretical investigations of the role of excluded volume, topological constraints, and attractive forces in the slow dynamics of soft matter systems
… force based theories to understand the slow dynamics of various soft matter systems. The starting point for all such theories is the generalized Langevin equation, which is characterized by the force-force time correlation function. By developing a self-consistent theory for the force …
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Simulation studies of slow dynamics of hydration water in lysozyme : hydration level dependence and comparison with experiment using new time domain analysis
A series of Molecular Dynamics (MD) simulations using the GROMACS® package has been performed in this thesis. It is used to mimic and simulate the hydration water in Lysozyme with three different hydration levels (h = 0.3, 0.45 and 0.6). In this thesis, GROMACS is used in an innovative way, because …
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Rheology and Microstructure of Filled Polymer Melts
… bulk flow mechanics to determine the origin of slow dynamics in these complex dispersions: whether a gel or glass transition or a slowing down of dispersing phase dynamics. These studies were conducted to understand polymer mediated particle-particle interactions and potential particle-polymer …
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Topics in diffuse field ultrasonics
… of theory and experiment. The third topic is Slow Dynamics, a remarkable non-classical nonlinear elastic behavior found in a wide-range of materials that possess a cracked microstructure and at various length scales. Two new experimental venues and a variety of preliminary studies are …
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A new approach to the dynamic security assessment of power systems including relay performance
… The impact of the presence of the fast and slow dynamics has been addressed from a computational point of view. Finally, the sensitivity theory has been used to establish the scheme for preventive action.
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Robust computational methods to simulate slow-fast dynamical systems governed by predator-prey models
… in this work are singularly perturbed (slow-fast) predator-prey systems which are characterized by the presence of a very small positive parameter representing the separation of time-scales between the fast and slow dynamics. Solution of such problems involve multiple scale phenomenon …
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New modeling and control solutions for integrated microgrid system with respect to thermodynamics properties of generation and demand
… control stability with respect to thermodynamics behaviors of generation and demand. First, a new integrated microgrid model is introduced. This model consists of a combined cycle power plant, a building with air-conditioning system and a renewable source. This integrated model allows …
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Aircraft wing rock dynamics and control
The dynamics of wing rock on rigid aircraft having single, two, and three rotational degrees-of-freedom are analyzed. For the purpose of the analysis, nonlinear mathematical models of the aircraft are developed. The aerodynamic expressions contained in the models can be built by fitting the …
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Protein structural dynamics and thermodynamics from advanced simulation techniques
… (DRP) approach, in order to study aspects of dynamics and thermodynamics in three different families of peculiar proteins. These proteins are, for reasons such as the presence of an intermediate state in the folding path or topological constraints or large size, different from ideal systems, …
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Approximate Dynamic Programming with Applications
… systems, is usually restricted to systems with slow dynamics. One reason for this is that the delay between measurement and actuation introduced by computing the control signal on-line can severely degrade systems with fast dynamics. A method to improve robustness against such delays and other …
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