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 51 for “"Multiscale model"”.
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A Multiscale Model for Breast-Conservative Therapy: Computational Framework and Clinical Validation
… the BCT field developing a 3D patient-specific multiscale model that could predict the breast shape after lumpectomy, from surgery to complete healing. This model consists of two parts: a hyperelastic Neo-Hookean Finite-Element Model of the breast tissues and skin, and a Cellular Automata model …
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A Patient-Specific Multiscale Model of Mechanical Ventilation of COVID-19-afflicted Lungs
… ventilation. This thesis aims to create a multiscale physics-based computational modeling framework for COVID-19-related acute respiratory distress syndrome (CARDS) to examine region-specific and overall lung dynamics for patients subject to mechanical ventilation. This goal is accomplished …
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A multiscale model for the oxide ion conducting and proton conducting solid oxide cells
… SOCs are not well understood. Here, we develop a multiscale model combining density functional 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 …
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Multiscale Modelling of HIV/AIDS Transmission Dynamics
… the following research question: Can we use a multiscale model of HIV/AIDS transmission dynamics to assess the comparative effectiveness of health interventions that are implemented at different scale domains? To achieve the set objectives of the study, we use multiscale modelling approach, a …
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Multiscale Modelling of Hepatic Viral Infection
The multiscale modelling of hepatic viral infection was introduced in this work and various approaches were carried out to contribute effectively to the control and eradication of viral hepatitis in sub-saharan Africa. A nested multiscale model was developed by applying the Replication-Transmission …
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Stochastic realization theory for exact and approximate multiscale models
… of the independence structure possessed by multiscale models and demonstrates that such an analysis provides important insight into the multiscale stochastic realization problem. Multiscale models constitute a broad class of probabilistic models which includes the well--known subclass of …
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Multiscale Modelling of Environmentally Transmitted Infectious Diseases
… to witness an overwhelming appreciation of multiscale modelling as an essential and suitable technique as opposed to a traditional single-scale modelling approach in predicting the dynamics of infectious disease systems. Yet, there is still a lack of evidence that generally indicates which …
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A dynamic multiscale viscosity algorithm for shock capturing in Runge Kutta Discontinuous Galerkin methods
… developed for hyperbolic equations. The Dynamic Multiscale Viscosity method, originally presented by Oberai and Wanderer [8, 9] in a Fourier Galerkin context, is adapted to the Discontinuous Galerkin discretization. The notions of diffusive model term, artificial viscosities, and the Germano …
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Multiscale modeling of the lumbar spine to investigate tissue-level load transfer during activities of daily living
… measured during daily activities. Computational modeling techniques provide a solution in silico for estimating lumbar spinal loads that are difficult or impossible to measure. While common types of biomechanical computational models (i.e., musculoskeletal and finite element (FE) models) have …
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Multiscale Modeling of an Industrial Nylon-6 Leacher
This thesis presents a multiscale model of an industrial nylon-6 leacher. We develop several models at various spatial scales and implement them together in a simplistic, efficient way to develop an overall leacher model. We solve dynamic transport differential equations using the finite-volume …
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Debonding in bi-layer material systems under moisture effect : a multiscale approach
… system. In the computational approach, a multiscale model which can predict the intrinsic strength between organic and inorganic materials, based on a molecular dynamics simulation approach, is presented. The intrinsic strength between epoxy and silica derived from the molecular level can …
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Computational Analysis of Silicon Nanoelectromechanical Systems
… we extend the quasicontinuum (QC) approach for multiscale analysis of silicon nanostructures at finite temperature. Three models, namely the real space quasiharmonic (QHM) model, the local quasiharmonic (LQHM) model, and the reciprocal space quasiharmonic (QHMK) model are investigated. Within …
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Multiscale and Dirichlet Methods for Supply Chain Order Simulation
… in that it relies extensively on Dirichlet and multiscale methods to tackle supply-chain order simulation. Multiscale model methodology is furthered to include Dirichlet models which are used to simulate order times for each customer and the collective system on different scales.
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Data-driven Techniques For Estimation And Stochastic Reduction Of Multiscale Systems
… widely used techniques for obtaining effective models, given a discrete dataset. Often, the experimental or observational datasets are not explicitly generated by the underlying stochastic model and are, thus, expected to agree with the model only in approximate statistical sense, also referred …
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Multi-scale numerical modelling of phase transition phenomena in metallic alloys
A multiscale numerical model of the solidification process involving the metallic alloys is proposed. The purpose of this model is to increase our basic knowledge of the physics of the solidification by incorporating atomic aspects of the phase change and, therefore, to predict the rnicrostructural …
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Micromechanical models of delamination in aluminum-lithium alloys
… effective toughness of a component, no current model accurately predicts the initiation and growth of intergranular cracks. Since simulations cannot incorporate delamination into a structural model, designers cannot quantify the effect of delamination cracking on a particular component. This …
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Extreme energy absorption : the design, modeling, and testing of negative stiffness metamaterial inclusions
… these buckled elements, a nonlinear hierarchical multiscale material model is derived which estimates the macroscopic stiffness and loss of a composite material containing pre-strained microscale structured inclusions. The nonlinear multiscale model is then utilized in a set-based hierarchical …
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Reduced-Order Modeling of Complex Engineering and Geophysical Flows: Analysis and Computations
Reduced-order models are frequently used in the simulation of complex flows to overcome the high computational cost of direct numerical simulations, especially for three-dimensional nonlinear problems. Proper orthogonal decomposition, as one of the most commonly used tools to generate reduced-order …
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Coupled theoretical and experimental methods to characterize heterogeneous, anisotropic, nonlinear materials: application to cardiovascular tissues
… kinematics, a nonlinear closed-form structural model of planar fibrous tissue mechanics was utilized to describe the nonlinear behavior of a cardiovascular soft tissue (rat ventricle wall), and the partitioning method utilized by GAIM was replaced with a more robust partitioning scheme. Then, …
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Dimensionality reduction and multiscale modeling for the understanding of protein folding and hierarchical self-assembly
… peptide alignment. I also identify regions of model parameter space defining particular peptide chemistries that are expected to rapidly agglomerate into fibrils with desirable optoelectronic properties. In sum, this work establishes new computational methods and machine learning techniques, …
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