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 28 for “"continuum modeling"”.
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Continuum modeling of polarizable systems
The basic equations embodying macroscopic conservation and balance statements applicable to polarizable media are derived phenomenologically. These general balance statements are then applied to the particular case of ferrofluids, thereby obtaining the governing equations for isothermal …
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Continuum modeling of particle suspension conductivity
A suspension of network-forming, electrically conductive particles imparts electrical conductivity to an otherwise insulating medium. This effect can be used to great effect in many industrial applications. The ability to describe these networks and to predict their physical properties is a key …
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Self-consistent continuum modeling of radio-frequency glow discharges
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1990.
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Defects in crystalline silicon : integrated atomistic and continuum modeling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.
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Continuum modeling of the deceleration transient state in stochastic traffic flow
… extensions, traditionally used in traffic flow modeling, may not be sufficient in applications such as real-time estimation and prediction of traffic flow conditions. In previous studies, the issue of physical relevance has received little attention in efforts to introduce a stochastic component …
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Hyperelastic continuum modeling of cubic crystals based on first-principles calculations
… For the first time, we combine the formalism of continuum mechanics invariant theory with the predictive capability of quantum mechanics to model the hyperelastic response of cubic crystals. We use a complete and irreducible basis of strain invariants to capture the symmetries and non-linearities …
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Continuum modeling of electro-chemo-mechanical phenomena in all-solid-state batteries
… phases in composite electrodes. Computational modeling for SSBs is at its infancy and constitutes the focus of this thesis, with an emphasis on mechanical integrity of composite electrodes and deposition-induced fracture of SSE. Both cathode and anode may consist of a composite of active …
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Micropolar Continuum Modeling of Large Space Structures with Flexible Joints and Thermal Effects: Theory and Experiment
… equivalence concept is employed to find the continuum model for the system. The kinetic and strain energy expressions of the fundamental elements are found based on the assumptions of the micropolar elasticity theory. Necessary assumptions are made to reduce the order of the strain variables …
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Improving radiation resistance of solid solutions by addition of defect trapping solutes: Atomistic simulations and continuum modeling
Many radiation damage phenomena are driven by the production and fluxes of point defects, particularly in alloys. The addition of defect-trapping solute has been proposed to improve radiation damage tolerance. Selecting effective solute is complicated however, because the trapping is a complex …
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Development of a reduced-order modeling technique for granular locomotion
… the development and expansion of a reduced-order modeling technique called granular Resistive Force Theory(RFT) for modeling wheeled locomotion on granular beds. A combination of various modeling techniques, namely plasticity-based continuum modeling, discrete element method (DEM) modeling, along …
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Development of Models for Mixtures of Fluids and Granular Sediments
… it is desirable to model these problems using continuum techniques, where microscopic grain-scale properties are homogenized into bulk descriptions of the mixture’s behavior. This approach offers exceptional scaling; however, it requires the development of material constitutive models and …
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Optimization of slender space trusses utilizing a continuum model
A method for the incorporation of continuum modeling in the optimization of large discrete structures is presented. The use of a continuum model facilitates decomposition of optimization problems and augments the scope and applicability of the multilevel decomposition method. This new concept is …
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Enhanced droplet spreading due to thermal fluctuations
… affect dynamics and may need to be included when modeling nanometer mechanical systems. Yet, explicitly modeling all of the molecules of a thin liquid film interface is often intractable. Thus there is a need for simplified continuum models that still contain the relevant physics of thin films. …
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A numerical framework for the direct simulation of solid-fluid systems
… limited by the nonexistence of a high-fidelity modeling capability for these multiphase systems. Continuum modeling approaches overlook the microscale solid-fluid interactions from which macroscopic system properties emerge, while experimental inquiries have been plagued by high costs and …
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Atomistics of defect nucleation and mobility : dislocations and twinning
Multiscale materials modeling has emerged in recent years as a significant concept and the only viable approach to understand the mechanical response of materials by linking modeling research at different length scales and time scales, including quantum mechanics, atomistics modeling, mesoscale …
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Architectural experience and motion : a design tool based on simulation and immersing technologies
… of digital 3D environments and space/time continuum. Modeling, manipulation, and navigation are analyzed and concrete original implementations are shown. A new method, similar to a 3D parallel ruler, is demonstrated to overcome constraints in representation , imposed by two-dimensional …
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A Multiscale Method for Simulating Fracture in Polycrystalline Metals
… and are mapped into cohesive zone models for continuum modeling within a finite element framework. Fracture along grain boundaries typically exhibit a dependence of crack tip processes (i.e. void nucleation in brittle cleavage or dislocation emission in ductile blunting) on the direction of …
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A multiscale model for the oxide ion conducting and proton conducting solid oxide cells
… theory calculations, transition state theory and continuum modeling to elucidate the essential reaction steps and predict the performance of the device. Density functional theory calculations are used to obtain the free energy barriers for different reaction steps, transition state theory is used …
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Efficient coarse-grained brownian dynamics simulations for dna and lipid bilayer membrane with hydrodynamic interactions
… outstanding agreements with experiments and continuum modeling by adopting Stokesian dynamics and explicit solvent model. Finally, when combined with fast algorithms such as the fast multipole method (FMM) which has nearly optimal complexity in the total number of CG particles, the resulting …
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Negative magnetophoresis of submicron species in magnetic nanofluids
… and simulated results were obtained using continuum modeling. Good quantitative agreement was found between experiments and theory for both latex-bead sizes at various experimental conditions. Size-based trapping of latex beads was accomplished by balancing drag and magnetic buoyancy forces …
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