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Dissertations / Theses on the topic 'Voronoi Cell Finite Element Method'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Li, Shanhu. "Extended voronoi cell finite element model for damage in brittle matrix composites." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135317411.

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2

Moorthy, Suresh. "The Voronoi cell finite element method for response and damage analysis of arbitrary heterogeneous media /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487945015618205.

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3

Storm, Johannes. "Entwicklung und Bewertung von effizienten Berechnungskonzepten für keramische Filter." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-218483.

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Die vorliegende Dissertation beschäftigt sich mit der thermo-mechanischen Beschreibung und Bewertung von keramischen Filtern für die Metallschmelze-Filtration mithilfe der Finiten-Elemente-Methode. Infolge des zellularen Aufbaus des Werkstoffs handelt es sich um ein Mehrskalenproblem. Grundlegende Aufgaben der Arbeit waren deshalb die geometrische und mechanische Modellbildung sowie die Untersuchung verschiedener effizienzsteigernder Methoden zur Gewinnung einer akkuraten numerischen Lösung. Dabei wurden sowohl verschiedene Verfahren aus der Fachliteratur implementiert und kritisch bewertet, a

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4

Venkatesan, Vidhyashankar. "Finite element analysis of cell subjected to compressive loading." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2796.

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Thesis (M.S.)--West Virginia University, 2002.<br>Title from document title page. Document formatted into pages; contains xii, 123 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 84-88).

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5

Hu, Chao. "Locally enhanced voronoi cell finite element model (LE-VCFEM) for ductile fracture in heterogeneous cast aluminum alloys." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1199209208.

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6

Alborghetti, Londero Afonso. "A Cut-Cell Implementation of the Finite Element Method in deal.ii." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-263469.

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The modeling of problems where the boundary changes significantly over time may become challenging as the mesh needs to be adapted constantly. In this context, computational methods where the mesh does not conform to the boundary are of great interest. This paper proposes a stabilized cut-cell approach to solve partial differential equations using unfitted meshes using the Finite Element Method. The open-source library deal.ii was used for implementation. In order to evaluate the method, three problems in two-dimensions were tested: the Poisson problem, a pure diffusion Laplace-Beltrami proble

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7

Pérez, Cesar Augusto Conopoima. "Mortar finite element method for cell response to applied electric field." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6037.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-01-11T16:41:11Z No. of bitstreams: 1 cesaraugustoconopoimaperez.pdf: 4395089 bytes, checksum: 9e33b57e376886bbc7ff8300d693cf87 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-01-22T16:42:49Z (GMT) No. of bitstreams: 1 cesaraugustoconopoimaperez.pdf: 4395089 bytes, checksum: 9e33b57e376886bbc7ff8300d693cf87 (MD5)<br>Made available in DSpace on 2018-01-22T16:42:49Z (GMT). No. of bitstreams: 1 cesaraugustoconopoimaperez.pdf: 4395089 bytes, checksum: 9e33b57e376886bbc7ff8300d693cf87 (MD5

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8

Wang, Sili. "An ABAQUS Implementation of the Cell-based Smoothed Finite Element Method Using Quadrilateral Elements." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233762.

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9

Green, Seth. "Multilevel, subdivision-based, thin shell finite elements : development and an application to red blood cell modeling /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/7110.

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10

Farhadi, Mehrnoush. "Finite Element Modeling of Steel Corrosion in Concrete Structures." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/85022.

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Concrete is a popular construction material for bridges, due to its high durability and energy efficiency. An important concern for concrete bridges is the possible occurrence of chloride- induced corrosion in prestressing strands and reinforcing bars, which may substantially impact the service life of such structures. Chloride- induced corrosion is a complicated electrochemical process which is affected by heat transfer, moisture flow and transport of chemical species through the concrete pore network. Reliable and robust analytical tools are required to allow multi-physics simulations of ste

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11

Kondrat'yev, Andreiy I. "Finite element modeling and computer simulation of stresses and strains in diamond anvil cell devices." Birmingham, Ala. : University of Alabama at Birmingham, 2006. https://www.mhsl.uab.edu/dt/2008r/kondratyev.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2006.<br>Additional advisors: Heng Ban, Renato P. Camata, Krishan K. Chawla, Joseph G. Harrison. Description based on contents viewed Feb. 13, 2009; title from PDF t.p. Includes bibliographical references (p. 124-126).

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12

Stångberg, Valgeborg Fredrik. "Toward a Novel Gas Cell for X-Ray Spectroscopy : Finite Element Flow Simulation and Raman Characterization." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394134.

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The new millennium has seen revolutionary advances in photonsource technology. As the newly constructed synchrotron facilityMAX IV in Lund, Sweden, pushes brilliance toward what isphysically possible, low-yield spectroscopic techniques, such asresonant inelastic X-ray scattering (RIXS), open new doors inmolecular and condensed matter research. The VERITAS beamline atMAX IV is designed for high-resolution vibrational RIXS on gases.X-rays interact with flowing molecules inside a window-cappedcell, but the radiation intensity is expected to be large enoughto damage the windows, and cause build-up

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13

Sharifi, Hossein. "EVALUATION OF 2-CELL RC BOX CULVERTS." UKnowledge, 2018. https://uknowledge.uky.edu/ce_etds/66.

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Reinforced Concrete Box Culverts (RCBCs) are an integral part of the national and international transportation infrastructure. The National Bridge Inventory Standards (NBIS) requires that all bridges, which include culverts with spans ≥ 20 ft. (6.1 m), be load rated for safe load carrying capacity in accordance with the AASHTO Manual for Bridge Evaluation (MBE). In Kentucky, the Transportation Cabinet manages more than 15,500 bridges, of which almost 1,400 are bridge size culverts. Of the 1241 bridge size RCBCs that were being evaluated in Kentucky between 2015 and 2018, 846 were 2-cell culver

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14

Paquet, Daniel. "Adaptive Multi-level Model for Multi-scale Ductile Fracture Analysis in Heterogeneous Aluminum Alloys." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1324565883.

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15

MacMeccan, Robert Miles III. "Mechanistic Effects of Erythrocytes on Platelet Deposition in Coronary Thrombosis." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19786.

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A new lattice-Boltzmann finite-element method is used to simulate large numbers of deformable red blood cells and platelets in suspension for the investigation of stress-mediated platelet-deposition mechanisms in blood. The coupled lattice-Boltzmann finite-element method provides the novel ability to simulate hundreds of realistic and deformable red blood cells and produce continuum-scale physics at physiologic hematocrit and low arterial-shear rates. The new method is developed and shown to produce single red blood cell deformation consistent with experimental results in flow chambers. Simu

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16

Zhu, Lailai. "Simulation of individual cells in flow." Doctoral thesis, KTH, Stabilitet, Transition, Kontroll, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142557.

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In this thesis, simulations are performed to study the motion ofindividual cells in flow, focusing on the hydrodynamics of actively swimming cells likethe self-propelling microorganisms, and of passively advected objects like the red bloodcells. In particular, we develop numerical tools to address the locomotion ofmicroswimmers in viscoelastic fluids and complex geometries, as well as the motion ofdeformable capsules in micro-fluidic flows. For the active movement, the squirmer is used as our model microswimmer. The finiteelement method is employed to study the influence of the viscoelasticity

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17

Zamora, Torres David, and Felix Abeln. "Design of an In-situ cell, for hard X-ray spectroscopy of surfaces used in high-pressure and high-temperature experiments : Design av en In-situ cell för intensiv röntgenspektroskopi i högtryck- högtemperaturexperiment." Thesis, Malmö universitet, Institutionen för materialvetenskap och tillämpad matematik (MTM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-45607.

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This project analyzes how an in-situ cell can be developed to withstand high amounts of pressure and temperature of at least 100 bar and 500 °C. A theoretical prototype will be created as a product for Malmö University and other researchers to use or improve. To make this possible, the five step method was used to present a symmetric geometrical concept for the cell. That geometric concept was designed in PTC Creo (Version 6.0.2.0 & 7.0) in 3D and drawings in 2D. The programs GRANTA EduPack (Version 2020 \& Version 2019) along with Hephaestus was used to determine a material selection

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18

Nguyen, Truong B. "Efficient Numerical Methods For Chemotaxis And Plasma Modulation Instability Studies." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1564487925507593.

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19

Shao, Qian. "Coupling fluid flow, heat and mass transfer with thermo-mechanical process : application to cracked solid oxide fuel cell." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH008/document.

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Au cours des dernières décennies, les piles à combustible à oxyde solide sont devenues un dispositif prometteur de conversion d’énergie. Ceci est dû principalement à leur efficacité de conversion d’énergie, leur flexibilité du choix du carburant et leurs faibles émissions de polluants. Cependant, la température de fonctionnement élevée de cette variante de piles à combustible induit divers problèmes d’endommagement et de fissuration. Par conséquent, l’optimisation de leur durée de vie reste un problème à résoudre. Dans cette thèse, une approche numérique combinant la méthode des éléments finis

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20

Marth, Wieland. "Hydrodynamic Diffuse Interface Models for Cell Morphology and Motility." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204651.

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In this thesis, we study mathematical models that describe the morphology of a generalized biological cell in equilibrium or under the influence of external forces. Within these models, the cell is considered as a thermodynamic system, where streaming effects in the cell bulk and the surrounding are coupled with a Helfrich-type model for the cell membrane. The governing evolution equations for the cell given in a continuum formulation are derived using an energy variation approach. Such two-phase flow problems that combine streaming effects with a free boundary problem that accounts for bendin

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21

Giese, Wolfgang. "The choreography of yeast mating." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17657.

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Die Forschung an der Hefe Saccharomyces cerevisiae – auch als Bäckerhefe bekannt – hat sich für die biologische Grundlagenforschung als unentbehrlich erwiesen und führte zu wichtigen Erkenntnissen in der Erforschung von Krankheiten wie Krebs. Am Beispiel der Paarung von Hefezellen werden in dieser Arbeit wesentliche Aspekte der eukaryotischen Zellbiologie untersucht. In der Haplophase des Lebenszyklus der Hefe, treten haploide Zellen als Paarungstyp MATa oder MATα auf. Diese Paarungstypen kommunizieren über Pheromone, die in ein extrazelluläres Medium abgesondert werden und von Zelloberfläche

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22

Etienne, Marjorie. "Modélisation du disque intervertébral." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4732/document.

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La dégénérescence discale est généralement considérée comme le résultat de l'insuffisance chronique de la nutrition de ses cellules due à un déficit du renouvellement de la matrice extra-cellulaire. Des chargements mécanique excessifs et répétés sont parmi les principales causes créant des lésions dans les disques et à terme précipitent la dégénérescence discale. En modélisant le fonctionnement multi-physique du disque par un modèle quadriphasique couplé à un modèle métabolique des cellules, l'objectif de ce travail est d'aider à une meilleure compréhension du fonctionnement discal. Puis par u

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23

Celikbilek, Ozden. "Optimisation de la cathode pour pile à combustible à oxyde électrolyte solide : approches expérimentale et numérique." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI071/document.

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Comprendre, contrôler et optimiser le mécanisme de la réaction de réduction de l’oxygène à la cathode, cette démarche devient une nécessité pour améliorer les dispositifs de conversion d'énergie de haute performance tels que les piles à combustible à oxyde électrolyte solide (PAC). Des films poreux à conduction mixte, ionique et électronique (MIEC) et leurs composites comprenant un conducteur ionique offrent des propriétés uniques. Cependant, la corrélation des propriétés intrinsèques des composants d'électrodes aux caractéristiques microstructurales reste une tâche difficile. Dans le cadre de

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24

Parackal, Bhavana. "An Investigation of Low Temperature Direct Propane Fuel Cells." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35896.

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This research is directed toward the investigation of a low temperature direct propane fuel cell (DPFC). Modeling included a parametric study of a direct propane fuel cell using computational fluid dynamics (CFD), specifically FreeFem++ software. Polarization curves predicted by the CFD model were used to understand fuel cell performance. The predictions obtained from the computational fluid dynamics mathematical model for the fuel cell were compared with experimental results. The computational work identified some critical parameters (exchange current density, pressure, temperature) for impro

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25

Dang, Hong Lam. "Modélisation du comportement hydromécanique des réservoirs fracturés à double porosité et double perméabilité." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2001/document.

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La modélisation des massifs rocheux fracturés est un problèmes important dans de nombreux secteurs industriels, y compris, mais sans s'y limiter à l'exploitation pétrolière et gazière. Dans la littérature, les roches fracturées sont reconnues comme des milieux à double porosité et double perméabilité dans lesquels le réseau de fractures fournit la perméabilité primaire et la matrice rocheuse la perméabilité secondaire. L'idée de la dissociation de l'écoulement à l'intérieur du réseau de fractures et de la matrice,la double perméabilité, est toujours contestée pour les réservoirs fracturés. De

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26

Carton, Louise. "Mechanical properties of thin silicon wafers for photovoltaic applications : Influence of material quality and sawing process." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI107.

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Le wafer de silicium cristallin est le composant clé de la cellule solaire et représente une part significative du prix du module photovoltaïque. La réduction de l’épaisseur des wafers offre donc une voie privilégiée pour diminuer les coûts de production de l’énergie solaire. Le maintien de faibles taux de casse lors de la manipulation de ces fines plaquettes reste cependant un obstacle majeur. Dans ce contexte, il est primordial d’améliorer notre compréhension des mécanismes de fragilisation et de rupture des wafers. Ce travail étudie les propriétés mécaniques des wafers de silicium obtenus p

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27

Storm, Johannes. "Entwicklung und Bewertung von effizienten Berechnungskonzepten für keramische Filter." Doctoral thesis, 2016. https://tubaf.qucosa.de/id/qucosa%3A23105.

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Die vorliegende Dissertation beschäftigt sich mit der thermo-mechanischen Beschreibung und Bewertung von keramischen Filtern für die Metallschmelze-Filtration mithilfe der Finiten-Elemente-Methode. Infolge des zellularen Aufbaus des Werkstoffs handelt es sich um ein Mehrskalenproblem. Grundlegende Aufgaben der Arbeit waren deshalb die geometrische und mechanische Modellbildung sowie die Untersuchung verschiedener effizienzsteigernder Methoden zur Gewinnung einer akkuraten numerischen Lösung. Dabei wurden sowohl verschiedene Verfahren aus der Fachliteratur implementiert und kritisch bewertet, a

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28

Chen, Li-Wei, and 陳立維. "Stress Analysis of Planar Solid Oxide Fuel Cell Using Finite Element Method." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qn37b6.

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碩士<br>國立交通大學<br>機械工程系所<br>106<br>Solid oxide fuel cell (SOFC) is a composite material that consists of multiple layers and structures, which includes anode, cathode, connector, channels, and so on. SOFC uses electro-chemical reactions to generate electricity, which would normally take place at the temperature 600~1000 °C. Due to the high temperature, temperature gradient, and large mismatched thermal-expansion coefficients in each layer, the SOFC experiences lots of stress which deteriorate its lifecycles. The aim of this research is to investigate on the relationship between the operation str

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29

Carvalheiro, Márcio Pinheiro. "Exploratory analysis of the finite cell method in structural applications." Master's thesis, 2017. http://hdl.handle.net/10773/23871.

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The Finite Element Method (FEM) is a structural analysis method that appeared in the last century, being still to this day the reference in the modelling and numerical simulation elds. However, as any approximation method, there are a few limitations in the FEM. The di culty in generating a nite element mesh represents one of these limitations. It's precisely in response to this limitation that emerges the Finite Cell Method (FCM). The possibility of creating analysis elements inserted in perfectly structured meshes allows the bypass of the need of the mesh to conform to the boundarie

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30

Che, Chia-Wei, and 車家偉. "Simulation of Modal Analysis of Micro Proton Exchange Membrane Fuel Cell by Finite Element Method." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/18004973501161157479.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>101<br>Objects resonate and cause structural damage when the frequencies of forced vibrations are similar to the natural frequency of the object. Therefore, the purpose of this study was to identify the natural frequency of micro-proton-exchange membrane fuel cells (micro PEMFCs) to establish an acceptable vibration source frequency in fuel cells. In this study, ANSYS Workbench software was used for simulating micro PEMFCs, using the 3D finite-element method, to examine vibrations in fuel cells. A spectrum analyzer and impulse hammer were used to verify the reli

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31

Branets, Larisa Vladimirovna Carey Graham F. "A variational grid optimization method based on a local cell quality metric." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1827/branetsl64407.pdf.

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32

Branets, Larisa Vladimirovna. "A variational grid optimization method based on a local cell quality metric." Thesis, 2005. http://hdl.handle.net/2152/1827.

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Cheng-IHo and 何承益. "Hybrid Finite-Element and Particle-in-Cell Method for Simulating Charged Ion Migration in Capillary Zone Electrophoresis." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/38197033377326538356.

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博士<br>國立成功大學<br>機械工程學系<br>102<br>The dissertation proposed a numerical model of hybrid finite-element and particle-in-cell method to simulate charged ion migration in the cross-channel capillary zone electrophoresis system. Analytes separated by capillary zone electrophoresis are governed by the ion migration with different charge-to-mass ratios. Different to the traditional numerical method, this method can be used to simulate the migration phenomenon of the differently charged ions for handling complex geometries and irregular boundary conditions in the capillary zone electrophoresis system.

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34

Hou, Chieh. "Implementation and Validation of Finite Element Framework for Passive and Active Membrane Transport in Deformable Multiphasic Models of Biological Tissues and Cells." Thesis, 2018. https://doi.org/10.7916/D8TX4XVP.

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The chondrocyte is the only cell type in articular cartilage, and its role is to maintain cartilage integrity by synthesizing and releasing macromolecules into the extracellular matrix (ECM) or breaking down its damaged constituents (Stockwell, 1991). The two major constituents of the ECM are type II collagen and aggrecans (aggregating proteoglycans). Proteoglycans have a high negative charge which attracts cations and increases the osmolarity, while also lowering the pH of the interstitial fluid. The fibrillar collagen matrix constrains ECM swelling that results from the Donnan osmotic pressu

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35

Sung, Ming-Je, and 宋明哲. "The Analysis of Highly Birefringent and Low Loss Photonic Crystal Fiber with Complex Unit Cell of Circular Air Holes Cladding by Use of Finite Element Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55866240117440448895.

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36

Chen, Xiaoguang. "Multiscale Modeling of Amphibian Neurulation." Thesis, 2007. http://hdl.handle.net/10012/3405.

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This thesis presents a whole-embryo finite element model of neurulation -- the first of its kind. An advanced, multiscale finite element approach is used to capture the mechanical interactions that occur across cellular, tissue and whole-embryo scales. Cell-based simulations are used to construct a system of constitutive equations for embryonic tissue fabric evolution under different scenarios including bulk deformation, cell annealing, mitosis, and Lamellipodia effect. Experimental data are used to determine the parameters in these equations. Techniques for obtaining images of live embryos, s

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Zhao, Ruogang. "The Development and Application of Tools to Study the Multiscale Biomechanics of the Aortic Valve." Thesis, 2012. http://hdl.handle.net/1807/33866.

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Calcific aortic valve disease (CAVD) is one of the most common causes of cardiovascular disease in North America. Mechanical factors have been closely linked to the pathogenesis of CAVD and may contribute to the disease by actively regulating the mechanobiology of valve interstitial cells (VICs). Mechanical forces affect VIC function through interactions between the VIC and the extracellular matrix (ECM). Studies have shown that the transfer of mechanical stimulus during cell-ECM interaction depends on the local material properties at hierarchical length scales encompassing tissue, cell and cy

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