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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 219 for “"coarsening"”.
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Automated Quadrilateral Coarsening by Ring Collapse
… in this thesis, the Automated Quadrilateral Coarsening by Ring Collapse (AQCRC) algorithm, provides a unique solution to allow conformal coarsening of both structured and unstructured quadrilateral finite element meshes. The algorithm is based on dual chord operations and dual chord removal. …
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Topological characterization of nanoporous gold during coarsening
… of nanoporous gold have found that, during the coarsening process, the genus per characteristic volume of nanoporous gold has remained constant. Using a rolling-ball type algorithm, in which a test probe rolls over the surface to identify atoms, several test structures and a small-scale …
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Optimization-based algebraic multigrid coarsening using reinforcement learning
DSpace SAF Submission Ingestion Package generated from Vireo submission #16982 on 2022-01-12 at 12:46:07
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Modeling Bubble Coarsening in Froth Phase from First Principles
… wave motion. Based on the Hcr model, bubble-coarsening in a dynamic foam has been predicted by deriving the geometric relation between the thickness of the lamella film, which controls bubble-coalescence rate, and the Plateau border area, which controls liquid drainage rate. Furthermore, a …
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Probing the dynamic scaling hypothesis in 1-D coarsening particle systems
… will provide the reader with an idea of what coarsening is and when and where it may occur. The concise definition of coarsening that we employ is that characteristic length scales grow in time. The Dynamic Scaling Hypothesis which asserts that upon suitable scaling of space, features of …
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Energy landscape statistics and coarsening in liquids: a relaxation mode analysis
… revealed a prominent dynamic decoupling and a coarsening effect of the energy landscape at different length scales. These demonstrations suggest that RMA is a promising tool to extract energy landscape statistics from experimental data. In the end, we discuss the future extensions of RMA from …
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Effect of composition and coherency strains on coarsening in nickel-aluminum-silicon alloys
… been made in the theoretical understanding of coarsening in coherently stressed solids. Experimental verification of the theoretical predictions are difficult. Interpretation of coarsening rate data obtained in multi-component systems is difficult, due to the presence of a gradually varying, …
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High-resolution simulation of pattern formation and coarsening dynamics in 3D convective mixing
… network, we identify various regimes of finger coarsening over time, the existence of a nonequilibrium stationary state, and an universal scaling of 3D convective mixing. We explore the correlation between the observed network pattern and the 3D flow structure predicted by hydrodynamics …
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Mechanisms of Cell Nucleation, Growth, and Coarsening in Plastic Foaming: Theory, Simulation, and Experiment
… research for the cell nucleation, growth and coarsening mechanisms during plastic foaming processes. Enforced environmental regulations have forced the plastic foam industry to adopt alternative blowing agents (e.g., carbon dioxide, nitrogen, argon and helium). Nevertheless, the low …
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Interpretation of coarsening upwards hemicycles in the Upper Paleozoic rocks of South-central West Virginia
… consists of alternating fining upwards and coarsening upwards hemicycles a pair of which constitute a cyclothem. The cyclothems in Conemaugh seem to be less variable than in the Monongahela-Dunkard although they contain larger number of lithic states in them. The typical fining upward unit …
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Efficient Setup Algorithms for Parallel Algebraic Multigrid
… experimental results motivate the design of new coarsening algorithms to improve the performance of coarse-grid selection itself. A new algorithm labeled Bucket Sorted Independent Sets (BSIS) is developed and contributes two major advances. First, the cost of selecting independent sets while …
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Microfluidic Study of Gravity-Driven Drainage and Coalescence of Aqueous Two Dimensional Foams
… the larger bubbles to grow (Oswald ripening or coarsening). Coalescence can be significantly retarded by the use of surfactants which adsorb onto the interfaces of the phases and create a disjoining pressure, stabilizing the thin lamellae. Surfactants have a much smaller effect on coarsening. …
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Irradiation-induced nanoclusters and their evolution in compound forming ni-base and cu-base alloys
… by forming stable compound formation. Thermal coarsening of precipitates of nominally pure alloy constituents and compounds were systematically studied in three systems: Ni-W binary, Cu-Mo-Si, Cu-Nb-Si ternary. 1) In the Ni-W system, which forms compounds at low temperature but undergoes phase …
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Microstructure, Thermal Stability and Consolidation of Nanostructured and Ultrafine Structured Cu based Metal Matrix Composite and Alloy Powders Produced by High Energy Mechanical Milling
… the annealing temperature to 300 C causes slight coarsening of the Cu grains. Further increasing the annealing temperature to 500 C caused significant coarsening of the Cu grains and the Al2O3 nanoparticles. With increasing the volume fraction of Al2O3 nanoparticles, (i) the thermal stability of …
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Quantitative Analysis of Microstructural Evolution in Polycrystalline Metal Matrix with Embedded Second Phase Particle
… to preserve the grain structure by reducing coarsening significantly. From the numerical analysis, it is also found that these dispersed particles can lead to abnormal grain coarsening. The results suggest that abnormal coarsening occurs when the second phase particles are densely distributed …
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Effects of oxygen on the growth characteristics of carbon nanotubes on conductive substrates
… of introducing oxygen during the growth phase. Coarsening of the catalyst particles was suspected as a reason for the difference in growth patterns, and pre-annealed sample morphologies were characterized without C₂H₄ flow. AFM scans show apparent coarsening in samples exposed to hydrogen-rich …
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Validation and Application of a First Principle Flotation Model
… a froth model that can predict bubble coarsening due to coalescence in the absence of particles, iii) develop a computer simulator for a froth model that can predict bubble coarsening in the presence of particles, and iv) study the effects of incorporating a regrinding mill and using a …
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Non-destructive Electrical Characterization of Controlled Waspaloy Microstructures
… changes due to gamma prime coarsening. The height of the maximum decreased drastically with increase in aging temperature from 725 and 176;C to 800 and 176;C, while the resistivity did not increase from the solution-treated condition upon aging at 875 and 176; C. Coarsening …
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Solidification in a thin liquid film : growing Alq₃ needles via methanol-vapor annealing
… growth, the fluid films exhibited dewetting and coarsening behavior: the initially-uniform films broke up into small drops that coalesced to form larger drops. In the second part of this thesis, we develop a mathematical model describing these morphological changes-both drop formation and needle …
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