Global ETD Search

11	Biogeography-Based Optimization of a Variable Camshaft Timing System Thomas, George L. January 2014 (has links) No description available. Automotive Engineering Experiments BBO Biogeography-Based Optimization DACE EA Evolutionary Algorithm VCT Variable Camshaft Timing Variable Cam Timing Surrogate Modeling Response Surfaces
12	Retracer le changement de la répartition géographique d’une espèce grâce aux événements d’hybridation in situ Monette, Katherine 11 1900 (has links) No description available. Changements démographiques Événements d’hybridation Répartition géographique Changements climatiques Méné ventre citron Chrosomus neogaeus Complexe Chrosomus eos-neogaeus Demographic changes Hybridization events Geographical distribution Climatic changes Finescale dace Chrosomus neogaeus Chrosomus eos-neogaeus complex
13	Image Segmentation, Parametric Study, and Supervised Surrogate Modeling of Image-based Computational Fluid Dynamics Islam, Md Mahfuzul 05 1900 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / With the recent advancement of computation and imaging technology, Image-based computational fluid dynamics (ICFD) has emerged as a great non-invasive capability to study biomedical flows. These modern technologies increase the potential of computation-aided diagnostics and therapeutics in a patient-specific environment. I studied three components of this image-based computational fluid dynamics process in this work. To ensure accurate medical assessment, realistic computational analysis is needed, for which patient-specific image segmentation of the diseased vessel is of paramount importance. In this work, image segmentation of several human arteries, veins, capillaries, and organs was conducted to use them for further hemodynamic simulations. To accomplish these, several open-source and commercial software packages were implemented. This study incorporates a new computational platform, called InVascular, to quantify the 4D velocity field in image-based pulsatile flows using the Volumetric Lattice Boltzmann Method (VLBM). We also conducted several parametric studies on an idealized case of a 3-D pipe with the dimensions of a human renal artery. We investigated the relationship between stenosis severity and Resistive index (RI). We also explored how pulsatile parameters like heart rate or pulsatile pressure gradient affect RI. As the process of ICFD analysis is based on imaging and other hemodynamic data, it is often time-consuming due to the extensive data processing time. For clinicians to make fast medical decisions regarding their patients, we need rapid and accurate ICFD results. To achieve that, we also developed surrogate models to show the potential of supervised machine learning methods in constructing efficient and precise surrogate models for Hagen-Poiseuille and Womersley flows. Image-based Computational Fluid Dynamics Segmentation Machine Learning Surrogate Model Biomedical Fluid Stenosis Resistive Index 3D Slicer Choroid SEM CT MRI Lattice Boltzmann Method Gaussian Process Regression DACE Pulsatile Flow Hagen-Poiseuille Flow Womersley Flow Siemens NX SolidWorks
14	Does Shape Predict Performance? An Analysis of Morphology and Swimming Performance in Great Basin Fishes Aedo, John R. 08 December 2008 (has links) (PDF) Swimming performance strongly influences fitness in aquatic organisms and is closely tied to external body morphology. Although this connection has been closely examined at the individual and species level, few studies have focused on this relationship as it pertains to functional group assemblages. Using functional groups based on similarities in habitat use and morphology, I tested the hypothesis that swimming performance can be reliably predicted by functional group composition. I measured swimming performance as burst speed using a simulated predator attack and as prolonged speed using a step-endurance test in a laboratory flume. I measured morphology using geometric morphometric techniques. A difference in swimming behavior in four of the seven species was observed in the step-endurance test. Benthic species exhibited bracing behavior as an alternative to body-caudal fin (BCF) propulsion in the prolonged speed trials. Swimming performance exhibited a weak relationship with functional groups based on habitat or morphology. Rather a species-based model was the best predictor of swimming performance. Although species exhibited variation in swimming performance, body size was the strongest predictor of absolute swimming performance across all models. Relative swimming performance (measured in body lengths/sec) was negatively related to body size. The results of this study suggest that functional groups are not always reliable predictors of performance and they necessitate empirical testing to validate their effectiveness. This study also provides critical swimming performance data for previously unstudied Great Basin fishes which could be valuable for predicting fish passage through culverts, weirs and fish ladders. Swimming performance burst speed prolonged speed fish passage culverts allometric effects Great Basin brown trout mountain sucker cutthroat trout leatherside chub least chub longnose dance speckled dace mottled sculpin June sucker redside shiner Biology
15	IMAGE SEGMENTATION, PARAMETRIC STUDY, AND SUPERVISED SURROGATE MODELING OF IMAGE-BASED COMPUTATIONAL FLUID DYNAMICS MD MAHFUZUL ISLAM (12455868) 12 July 2022 (has links) <p> </p> <p>With the recent advancement of computation and imaging technology, Image-based computational fluid dynamics (ICFD) has emerged as a great non-invasive capability to study biomedical flows. These modern technologies increase the potential of computation-aided diagnostics and therapeutics in a patient-specific environment. I studied three components of this image-based computational fluid dynamics process in this work.</p> <p>To ensure accurate medical assessment, realistic computational analysis is needed, for which patient-specific image segmentation of the diseased vessel is of paramount importance. In this work, image segmentation of several human arteries, veins, capillaries, and organs was conducted to use them for further hemodynamic simulations. To accomplish these, several open-source and commercial software packages were implemented. </p> <p>This study incorporates a new computational platform, called <em>InVascular</em>, to quantify the 4D velocity field in image-based pulsatile flows using the Volumetric Lattice Boltzmann Method (VLBM). We also conducted several parametric studies on an idealized case of a 3-D pipe with the dimensions of a human renal artery. We investigated the relationship between stenosis severity and Resistive index (RI). We also explored how pulsatile parameters like heart rate or pulsatile pressure gradient affect RI.</p> <p>As the process of ICFD analysis is based on imaging and other hemodynamic data, it is often time-consuming due to the extensive data processing time. For clinicians to make fast medical decisions regarding their patients, we need rapid and accurate ICFD results. To achieve that, we also developed surrogate models to show the potential of supervised machine learning methods in constructing efficient and precise surrogate models for Hagen-Poiseuille and Womersley flows.</p> Flow analysis Biomechanical engineering Image-based COMPUTATIONAL FLUID DYNAMICS Segmentation Machine Learning Surrogate model CT MRI SEM 3D Slicer MATLAB Gaussian Process Regression DACE Lattice Boltzmann Method Hagen-Poiseuille Womersley Pulsatile flow Mechanical Engineering Computational Fluid Dynamics Flow Analysis Biomechanical Engineering
16	The Effect of Dredging on Fish Communities in Agricultural Streams in Crawford, Sandusky and Seneca Counties of Ohio. Selden, Justin D. 27 November 2013 (has links) No description available. Agriculture Animals Aquaculture Aquatic Sciences Animal Sciences Biology Biostatistics Conservation Ecology Environmental Geology Environmental Science Environmental Studies Geology Geobiology Hydrology Natural Resource Management Organismal Biology Sustainability Wildlife Conservation Wildlife Management Zoology Agriculture fish community morphology stream ditch river shiner minnow darter sunfish chub stoneroller dace topminnow Shannon Diversity Simpson's Index IBI Index of Biotic Integrity Richness Abundance dredge coefficient of variation

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