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.
Results
Showing 1 to 17 of 17 for “"dynamical theory"”.
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Structure, Thermodynamics, Mechanical Properties and Glassy Dynamics in Anisotropic Polymeric Materials
A dynamical theory has been developed for the onset or crossover temperature (Tc) to highly non-Arrenhius activated relaxation regime in deeply supercooled polymer liquids. Alignment and/or deformation modify thermodynamic and structural properties thereby inducing anisotropic segmental dynamics. …
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Relativistic theory of low energy electron diffraction
… crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem for the mixed-representation Dirac equation is followed by the construction of a …
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Theoretical Modeling of Polymeric and Biological Nanostructured Materials
… strong correlations between scattered beams. The dynamical theory (DT) model offers an exact model for interpreting off-specular signals from periodically structured surfaces and has been validated on substrates measured by neutron scattering. In this dissertation, we improved the model using a …
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Gamma-Ray Optical Studies of ⁷³Ge and ⁵⁷Fe
… Borrmann effect, which is a consequence of the dynamical theory of x-ray diffraction, and time-filtering which comes from time-domain Mossbauer spectroscopy.</p> <p>Our experiments involved the search for a nuclear Borrmann effect and the subsequent time-filtering effect using <sup>57</sup>Fe …
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Radical-molecule reaction dynamics in the low temperature regime.
… dependence suggested by statistical unimolecular theory within the collision complex model. The suggested variation of the reaction, OH + NO, is k = 7.0(±2.0) X 10⁻³¹ (T/300 K)^(2.6±0.3) over the range 90 to 550 K. The reaction, OH + N02, displayed falloff behavior in the pressure range studied …
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B phase nucleation and A-B interface dynamics in superfluid 3He
This thesis deals with the theory of the primary nucleation and subsequent expansion of the superfluid 3He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory …
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B phase nucleation and A-B interface dynamics in superfluid helium-3
This thesis deals with the theory of the primary nucleation and subsequent expansion of the superfluid $\sp3$He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory …
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The Structure and Composition of Metal Surfaces
… using TEM. The gold films were used to test a dynamical theory analysis of coherent (Bragg) and diffuse background scattering involving first order Laue zone diffracted beams, with moderately good agreement between theory and experimental results being obtained. Monolayer thickness changes have …
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Moist Baroclinic Instability and Macroturbulence of the Midlatitude Atmosphere
… poor. In chapters 2 and 4 of my thesis, a fluid dynamical theory is developed for DRVs both in terms of simple conceptual models of moist instability and potential vorticity dynamics of finite-amplitude storms. In particular, the dispersion relation for the growth rate and length scale of DRVs is …
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Investigating multiphoton phenomena using nonlinear dynamics
… has been studied and uncovered through nonlinear dynamical theory. The leitmotif of this thesis is changing phase-space structures and their (linear or nonlinear) stabilities by adding control functions (which act on the system as external perturbations) to the relevant Hamiltonians. These …
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Covariant thermodynamics & relativity
… processes within the context of the general theory of relativity. In particular, we address the problem of the `infinite' speed of propagation of thermal disturbances in a dissipative fluid. Although this problem is not new, its best known solution - the Israel and Stewart second order …
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Foundational Investigations & Astronomical Implications of Quantum Gravity
… a background independent formulation of Matrix Theory. We discuss a background independent formulation of a holographic theory of quantum gravity. The present thesis incorporates the necessary background material on geometry of canonical quantum theory, holography and spacetime thermodynamics, …
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The dynamic behaviour of check valves in pipeline systems
… unconfined, unsteady fluid flow are based on the dynamical theory of Kirchhoff, extended to an unsteady fluid flow. The equivalent equations for a body in a confined fluid are based on Lagrange's method of generalized coordinates. A general (dimensionless) valve equation of motion is developed, …
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Microscopic theory for dynamics in entangled polymer nanocomposites
… this dissertation focuses on developing a novel dynamical theory for a liquid of infinitely-thin rods in the presence of hard spherical obstacles, aiming at a technical and conceptual extension of the existing paradigm for entangled polymer dynamics. As a fundamental theoretical development, the …
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Structure, slow dynamics, kinetic arrest, and massively reconfigurable assembly in colloidal suspensions
… In Chapter 3 we develop and apply a statistical dynamical theory for dense isotropic sphere-rod mixtures as a function of attraction strength, aspect ratio, and composition. Up to seven transiently localized phases are predicted and dynamical complexity increases with rod aspect ratio. The …
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Fundamental Excitations of Nonconservative Quantum Fluids
… complicates their theoretical treatment. The dynamical theory of these nonconservative condensates is an emerging field which resides at the intersection of the theories of nonequilibrium pattern formation, nonlinear wave dynamics and condensed matter theory. In this thesis I describe several …
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Expertise and training effects on co-ordination dynamics in a whole body rhythmical task
… Both studies were based on the Dynamic Systems Theory. The environmental factor, which was considered as the control parameter affecting performance in both studies, was the music tempo. In the first study interjoint co-ordination responses were analysed in terms of a version of the Haken, Kelso …