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 53 for “"multi-scale approach"”.
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Fatigue Modeling of U720 --- a Multi-Scale Approach in Understanding Grain Boundary Effects on Crack Initiation
… based on the material's microstructure. Our approach is to model the energy of a persistent slip band (PSB) structure and use its stability with respect to dislocation motion as our failure criterion for crack initiation. The components that contribute to the energy of the PSB are identified, …
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Fatigue modeling of U720 – A multi-scale approach in understanding grain boundary effects on crack initiation
… the microstructure to fatigue properties using a multi-scale approach that focuses on integrating the results of atomic simulations to the continuum level in the form of a micro-mechanical model. Thus, to capture the physics at the grain boundary (GB) interface, it is necessary to investigate this …
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Societal risk and resilience analysis: A multi-scale approach to model the dynamics of infrastructure-social systems
… and 3) a scalable and adaptable mathematical approach that can model the performance of infrastructure at different scales of space and time, subject to different hazards. For the reliability and serviceability analysis of infrastructure, the dissertation develops general probabilistic and …
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The Role of Mechanical Interactions between Cells and the Extracellular Matrix on Mineralization in a Stem Cell-Seeded Scaffold: a Multi-Scale Approach
… Tissue engineering with stem cells may offer an approach to augment the healing rate in difficult-to-heal cases. Cell-collagen gel constructs have been recently used in several studies to promote mineralization. However, the role of mechanical factors to accelerate fracture repair has not been …
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Multi-scale investigation of vacancy-mediated diffusion of Si in Ni near an edge dislocation
… presence of solutes. In this work, we develop a multi-scale model which is able to simulate the diffusion of point-defects and solute atoms in the dislocation strain field. We first use kinetic Monte Carlo simulations to investigate the strain effects on the transport coefficients for vacancies …
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Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters.
… and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of <em>Ambystoma barbouri<em> (streamside salamander) and <em>Eurycea cirrigera<em> (southern two-lined salamander) in a relatively undisturbed stream network in central …
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Modifying a local measure of spatial association to account for non-stationary spatial processes.
… to the Ord and Getis Oi statistic). This approach can be applied to a single instance of a local region or to multiple spatial scales of the local region. I explore both in this paper using simulated datasets and a case study on mountain pine beetle infestation data. I find that the local …
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Multi-scale quantitative elastography and its application to blood pressure estimation
… elastography is developed using a fast multi-scale approach. The inverse problem optimization methods of elastography are applied to estimate noninvasively the arterial wall stiffness of a vessel as well as blood pressure. Simulation and experimental results are presented that predict …
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Microporomechanical modeling of shale
… and strength. Modeling is accomplished through a multi-scale approach, in which the experimental evidence gathered from novel nanoindentation techniques and conventional macroscopic tests informs the development of a suit of micromechanics tools for linking composition and microstructure to …
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From Protein Folds to Chromatin: Topological Data Analysis and Deep Learning at Multiple Scales
Across biological scales—from atomic-level protein folds to the three-dimensional architecture of chromatin—structural organization governs molecular function and regulation. We present two complementary computational frameworks that integrate geometric, topological, and spatial modeling with deep …
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A Vegetation Analysis on Horn Island, Mississippi, ca. 1940 Using Characteristic Dimensions Derived from Historical Aerial Photography
… was used to estimate habitat structure using a multi scale approach if any characteristics of habitat texture could be delineated from CV histograms. The classification met with a result of an 80% habitat map of Horn Island ca. 1940, at 21x21 window size proving, that CV can be used successfully …
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Hydrogen effects on the point defect spectrum in Fe-C alloys
As part of a multi-scale approach for modeling hydrogen embrittlement in hardened steels we have investigated, employing density functional theory methods, the stability and concentrations of the point defect clusters present in metastable Fe-C-H alloys with vacancies. The defect spectrum is found …
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Quantifying the Size Distribution of Rivers Across Spatial Scales
… rivers is commonly assumed to be fractal, or scale invariant. This assumption aids in statistical estimates of river surface area but has not been tested across spatial scales. We measured river size in four nested basins within the Mississippi River Basin using a combination of remote sensing …
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Mechanical properties of F-actin network
… behaviors is lacking. This thesis presents a multi-scale approach to identify the factors that determine the mechanical properties of F-actin networks from the macroscopic level to the single-molecule level. The mechanical properties of F-actin networks were probed by passive and active …
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Multi-scale Assessment of Bone Mechanics and the Mineral Phase of Intramuscular Bone of Atlantic Herring Fish
… and no process of remodeling.</p> <p>A multi-scale approach was developed to measure mechanical properties, mineral composition, mineral maturity or stoichiometric perfection, and distribution based on crystal thickness of 610 bone samples. Tensile modulus increased with tissue maturity …
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Material properties of actin filament bundles
… role of scruin in actin bundle crosslinking.A multi-scale approach is presented wherein the bending rigidity of scruin bundles and their constituent filaments are probed individually, then inter-related by simple mechanical models. Material properties of filaments and bundles are measured using …
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Integrative Geophysical and Environmental Monitoring of a CO2 Sequestration and Enhanced Coalbed Methane Recovery Test in Central Appalachia
… the ability to attribute signals to sources. A multi-scale approach to the monitoring design incorporated technologies deployed over different, overlapping spatial and temporal scales selected for the monitoring program include dedicated observation wells, CO2 injection operations monitoring, …
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Human and environmental influences on the distribution and abundance of arapaima in river floodplains of the Lower Amazon
… sustainable resource use. This thesis uses a multi-scale approach to understand the habitat factors controlling the distribution and abundance of arapaima (Arapaima spp.) in river floodplains of the lower Amazon River, near the municipality of Santarém, Para State, Brazil. In chapter 1, a …
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Hydration Mechanisms in Sulfonated Polysulfones for Desalination Membrane Applications
… for desalination membrane applications. A multi-scale approach is used to understand the relationships between the chemical structure of the polymer, the equilibrium water content, and the bulk properties. The polysulfones investigated here are aromatic polymers with relatively high ion …
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Evaluating wildlife response to vegetation restoration on reclaimed mine lands in southwestern Virginia
… site-specific, landscape-level, and mixed-scale logistic regression models to identify habitat characteristics that best predicted the presence of 27 species. For 18 species, mixed-scale models performed best, suggesting the importance of a multi-scale approach to habitat analysis. …
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