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 109 for “"Equation of Motion"”.
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Multi-valued Solutions for the Equation of Motion, Darcy-Jordan Model, as a Cauchy Problem: A Shocking Event
… are physical phenomenon that occur quite often around us. In this thesis we examine the occurrence of shocks in finite amplitude acoustic waves from a numerical perspective. These waves, or jump discontinuities, yield ill-behaved solutions when solved numerically. This study takes on the …
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Nonlinear Analysis of Composite Beams under Random Excitations
<p>The vibration responses of three unsymmetrically laminated beams, that are excited with a Gaussian random forcing function, are studied in this thesis. The beams are analyzed nonlinearly and compared to linear results, indicating some important corrections. The solution procedure begins with the …
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Non-equilibrium Thermodynamic Approach Based on the Steepest-Entropy-Ascent Framework Applicable across All Temporal and Spatial Scales
… (SEAQT). The SEAQT framework provides an equation of motion consisting of both reversible mechanical dynamics and irreversible relaxation dynamics, which is able to describe the evolution of any state of any system, equilibrium or non-equilibrium. Its key feature is that the irreversible …
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Ponto crítico quântico supercondutor em sistemas multi-bandas
The study of quantum phase transitions provides a new route to ¯nd and understand unconventional phases in Condensed Matter Physics. The past decades have seen a sub- stantial rejuvenation of interest in this area of study, driven by experiments on the cuprate superconductors, heavy fermions' …
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Experimental Identification of Nonlinear Systems
… identifying the nonlinear parameters of a model approximating the response of a cantilevered beam by a single mode. The model accounts for cubic inertia and stiffness nonlinearities and quadratic damping. The method of multiple scales is used to determine the frequency-response …
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Design and Modeling of a Catapulting Magnetic Transmission for Tuning Energy Storage and Release
The purpose of this work is to generate design rules and models for a catapulting magnetic leadscrew transmission. These rules and models empower scientists and engineers with the ability to tune energy storage and release, and thereby increase the peak specific power (power/mass) of an actuator. …
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Analytic progress in open string field theory
… open string fields, and it is thus a manifestly off-shell formulation of open string theory. The solutions to the equation of motion of open string field theory are expected to describe consistent classical open string backgrounds. In this thesis, I present a number of analytic results in bosonic …
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Um algoritmo de ordem superior para a integração direta das equações da dinâmica estrutural
… work an algorithm for the direct integration of the equation of motion of structural systems based on the cubis interpolation of the inertia forces is studied. The algorithm is conditionally stable and uses an iterative procedure. The spatial discretization is accomplished by the Finite …
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Snap-through of a shallow arch subjected to random excitation
The motion of a shallow arch subjected to random loading is investigated. It is expected that the arch will vibrate about its initial stable configuration under low intensity loading, but will snap back and forth about its horizontal axis under high intensity loading. The parameter of interest is …
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Qualitative and Quantitative Investigation of Planar Multibody Dynamics Encompassing GSSSS Family of Algorithms - A Novel In-depth Look
Growing interest in the simulation of constrained rigid/flexible multibody systems has prompted the development of a wide variety of time integration methods for the differential-algebraic equations (DAEs) inherent to these systems. The vast majority of these methods require refor- mulation of the …
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Fluxon Dynamics In Two-Gap Superconductor-Based Long Josephson Junction
… (LJJ) may be described by using the sine-Gordon equation. The difference in the phase dynamics between the LJJ with two-gap superconductors and that with the one-gap superconductors arises due to the presence of multiple tunneling channels between the superconductor (S) layers and the inter-band …
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The Transient Response of Flat Plates Using the Finite Element Method
… investigation by comparing the dynamic analysis of a discrete system with that of a plate continuum using the variational calculus. The transient response of the former may be determined by solving a matrix eigenvalue problem followed by modal analysis. In contrast the equation of motion of a …
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Prediction of Microstructural and Conformational Evolutions through Application of Steepest-Entropy-Ascent Quantum Thermodynamics
… and thermodynamics. This framework employs an equation of motion governed by the principle of steepest entropy ascent to determine the thermodynamic state evolution of modeled systems. The SEAQT framework has seen applied to multiple systems, including quantum and gas phase systems, in addition …
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Modeling and Experimental Validation of Disc and Reed Style Check Valves for Hydraulic Applications
The goal of this thesis is to develop a computationally inexpensive, accurate, and practical mathematical model of a hydraulic reed style check valve. While the modeling of disc style check valves is well represented in literature, reed valve modeling research has focused on applications in air …
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Rheological aspects of sickle cell anemia and related hemoglobinopathies
To evaluate the rheological behavior of certain hemoglobinopathies with respect to oxygen tension, the concept of optimum hematocrit was employed. The optimum hematocrit is defined as the hematocrit at which the erythrocyte flow rate is the greatest. It therefore represents the optimum oxygen …
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Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits
… in the transport and electronic properties of QDMs is important in making progress toward practical devices. We use many-body equation of motion method for Hubbard-Anderson model to study non-equilibrium charge and thermal transport properties of QDMs connected to metallic electrodes in the …
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Modeling the Non-equilibrium Phenomenon of Diffusion in Closed and Open Systems at an Atomistic Level Using Steepest-Entropy-Ascent Quantum Thermodynamics
… and describe the non-equilibrium phenomenon of diffusion based on the principle of steepest-entropy ascent. The research presented in this dissertation demonstrates the capability of this framework to model and describe diffusion at atomistic levels and is used here to develop a …
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The Electronic Excited States of Green Fluorescent Protein Chromophore Models
We explore the properties of quantum chemical approximations to the excited states of model chromophores of the green fluorescent protein of A. victoria. We calculate several low-lying states by several methods of quantum chemical calculation, including state-averaged complete active space SCF …
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An analytical approximation relating internal damping and strain amplitude
The degree of the approximation represented by the basic equation of motion of a vibratory system influenced by internal damping was improved by the assumption that the damping coefficient is proportional to the n<sup>th</sup> power of the strain (or stress) amplitude. The solution of the improved …
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Theoretical studies of the pulsar magnetosphere
Quantitative models of the plasma magnetosphere surrounding a rotating. magnetized. neutron star (pulsar) are studied in this thesis. Both the aligned model (rotation axis parallel to magnetic axis) and the nonaligned model are considered. An energy analysis is performed on two explicit models of …
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