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Dissertations / Theses on the topic 'Method of reduced elements'

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Published: 28 May 2022
Last updated: 31 July 2025

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1

Skoglund, Oskar, and Daniel Samvin. "Design of slender steel members : A comparison between the reduced stress method and the effective width method." Thesis, KTH, Bro- och stålbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189029.

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As of now, the most common way in Sweden, to address the issue of local buckling of steelstructures is through the procedure called the effective width method. A less commonprocedure for dealing with local buckling is the reduced stress method. The benefit of thelatter method is that, when combined with finite element analysis, results in a less tediousdesign process. However, this method is often labelled as a method that results in anoverconservative design. Therefore, the purpose of this report is to compare and evaluate thereduced stress method against the effective width method and nonlin
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2

Wahl, Jean-Baptiste. "The Reduced basis method applied to aerothermal simulations." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD024/document.

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Nous présentons dans cette thèse nos travaux sur la réduction d'ordre appliquée à des simulations d'aérothermie. Nous considérons le couplage entre les équations de Navier-Stokes et une équations d'énergie de type advection-diffusion. Les paramètres physiques considérés nous obligent à considéré l'introduction d'opérateurs de stabilisation de type SUPG ou GLS. Le but étant d'ajouter une diffusion numérique dans la direction du champs de convection, afin de supprimer les oscillations non-phyisques. Nous présentons également notre stratégie de résolution basée sur la méthode des bases réduite (R
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3

Daversin, Catty Cécile. "Reduced basis method applied to large non-linear multi-physics problems : application to high field magnets design." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD019/document.

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Le LNCMI est un grand équipement du CNRS. Il met à la disposition de la communauté scientifique internationale des aimants produisant des champs magnétiques intenses (entre 24 et 36 Teslas pendant plusieurs heures), utilisés par les chercheurs comme un moyen d'exploration et de contrôle de la matière. Dans la thèse, nous nous intéressons à la simulation de ce type d'aimants, dans le but de les étudier, d'optimiser leur design, ou encore de faire des analyses d'incidents. Ces modèles 30 sont basés sur des équations aux dérivées partielles couplées non-linéaires. Au vu de leur complexité, nous a
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4

Arkalgud, Ravi. "Vortex shedding analysis and control using reduced order modelling and viscous cell boundary element method." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274099.

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5

Song, Huimin. "Rigorous joining of advanced reduced-dimensional beam models to 3D finite element models." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33901.

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This dissertation developed a method that can accurately and efficiently capture the response of a structure by rigorous combination of a reduced-dimensional beam finite element model with a model based on full two-dimensional (2D) or three-dimensional (3D) finite elements. As a proof of concept, a joint 2D-beam approach is studied for planar-inplane deformation of strip-beams. This approach is developed for obtaining understanding needed to do the joint 3D-beam model. A Matlab code is developed to solve achieve this 2D-beam approach. For joint 2D-beam approach, the static response of a basic
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6

Zhao, Xiaopeng. "Modeling and Simulation of MEMS Devices." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11227.

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The objective of this dissertation is to present a modeling and simulation methodology for MEMS devices and identify and understand the associated nonlinearities due to large deflections, electric actuation, impacts, and friction. In the first part of the dissertation, we introduce a reduced-order model of flexible microplates under electric excitation. The model utilizes the von Karman plate equations to account for geometric nonlinearities due to large plate deflections. The Galerkin approach is employed to reduce the partial-differential equations of motion and associated boundary conditio
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7

Ori, Miklós. "Local Buckling of Doubly-Symmetric I-Sections Subjected to Warping Torsion : The limitations of the Reduced Cross-Section Method under unconventional loading." Thesis, KTH, Bro- och stålbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251031.

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In regular design practice, when it comes to conventional loading, such as uniaxial compression and bending, the local buckling of thin plates is taken care of through cross section classification. The effect of warping torsion, which also gives rise to normal stresses in the section, however, is typically not considered in the process. Present work aimed to uncover the influence of warping torsion on the phenomena of local plate buckling and to investigate the limitations of the effective width method when it was applied against its intended use. In the case of varying results, a simple corre
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8

Sedlář, Jiří. "Bezpečnostní rám závodního vozu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228897.

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Master thesis is about increasing of protection the crew in race car with changes in its roll-over protective structure according to current safety rules. For examination was used the Finite Element Method. The products of this thesis are different variation of roll cages, which are tasked to increasing the safety of existent race car.
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9

Fonseca, Júnior Lázaro Antônio da. "Técnica de redução de modelos improved reduced system enriched aplicada ao estudo do comportamento de sistemas mecânicos não lineares." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/7503.

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Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2017-06-21T20:19:46Z No. of bitstreams: 2 Dissertação - Lázaro Antônio da Fonseca Júnior - 2016.pdf: 4302435 bytes, checksum: d5e83d077c918367e41f439d3bab359e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Cláudia Bueno (claudiamoura18@gmail.com) on 2017-07-07T19:54:39Z (GMT) No. of bitstreams: 2 Dissertação - Lázaro Antônio da Fonseca Júnior - 2016.pdf: 4302435 bytes, checksum: d5e83d077c918367e41f439d3bab359e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e98
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10

Meng, Liang. "Reduced shape-space : approach to material characterization instrumented indentation test case." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2377/document.

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Ce travail se situe à l’intersection des trois disciplines : méthodes numériques, techniques expérimentales et du machine learning, a pour but de proposer une famille de techniques d’identification par analyse inverse des lois de comportement en mécanique. Dans le domaine d’identification des matériaux, l’indentation instrumentée est particulièrement attractive, car elle permet de procéder à des essais non-destructifs sur l’échantillon ou sur une structure en service. L’essai d’indentation, similaire à un test de dureté, consiste à enfoncer la pointe de l’indenteur à une faible profondeur dans
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11

Veys, Stéphane. "Un Framework de calcul pour la méthode des bases réduites : applications à des problèmes non-linéaire multi-physiques." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM069/document.

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Aujourd'hui, dans de nombreux champs d'applications, de plus en plus de problèmes d'ingénierie demandent d'avoir une évaluation précise et efficace de quantités d'intérêt.Très souvent, ces quantités dépendent de la solution d'une équation aux dérivées partielles (EDP) paramétrée où les paramètres -- physiques ou géométriques -- sont les entrées du modèle et les quantités d'intérêt -- valeurs moyennes -- en sont les sorties.Les techniques de réduction d'ordre, notamment la méthode des bases réduites qui est la méthode utilisée tout au long de ces travaux,permettent de répondre à ces demandes.Da
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12

Long, Craig Stephen. "Finite element developments and applications in structural topology optimization." Thesis, University of Pretoria, 2007. http://upetd.up.ac.za/thesis/available/etd-05062008-123415/.

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13

Phalippou, Pierre. "Data-enabled, reduced-order simulation of dynamical systems with application to vehicle crash simulation." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2544.

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Lors de la conception de nouveaux véhicules, les constructeurs automobiles font face à de nombreuses contraintes telles que la sécurité, le confort, le poids et la consommation de carburant. La simulation numérique, et plus précisément la méthode des éléments finis, y est très largement utilisée car elle permet de tester l'influence des différents paramètres sur le comportement du système. Ainsi, de nombreux tests réels sur prototypes sont évités. La conception de nouveaux véhicules est néanmoins ralentie par l'utilisation de modèles de plus en plus complexes, en particulier dans les applicati
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14

Weise, Michael. "Simplified calculation of rHCT basis functions for an arbitrary splitting." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-160152.

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Reduced Hsieh-Clough-Tocher elements are triangular C1-elements with only nine degrees of freedom. Simple formulas for the basis functions of reduced Hsieh-Clough-Tocher elements based on the edge vectors of the triangle have been given recently for a barycentric splitting. We generalise these formulas to the case of an arbitrary splitting point.
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15

Kolchuzhin, Vladimir. "Methods and Tools for Parametric Modeling and Simulation of Microsystems based on Finite Element Methods and Order Reduction Technologies." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000550.

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In der vorliegenden Arbeit wird die Entwicklung eines effizienten Verfahrens zur parametrischen Finite Elemente Simulation von Mikrosystemen und zum Export dieser Modelle in Elektronik- und Systemsimulationswerkzeuge vorgestellt. Parametrische FE-Modelle beschreiben den Einfluss von geometrischen Abmessungen, Schwankungen von Materialeigenschaften und veränderten Umgebungsbedingungen auf das Funktionsverhalten von Sensoren und Aktuatoren. Parametrische FE-Modelle werden für die Auswahl geeigneter Formelemente und deren Dimensionierung während des Entwurfsprozesses in der Mikrosystemtechnik ben
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16

Weise, Michael. "A note on the second derivatives of rHCT basis functions." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-154344.

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We consider reduced Hsieh-Clough-Tocher basis functions with respect to a splitting into subtriangles at the barycenter of the original triangular element. This article gives a proof that the second derivatives of those functions, which in general may jump at the subtriangle boundaries, do not jump at the barycenter.
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17

Weise, Michael. "A note on the second derivatives of rHCT basis functions - extended." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-160168.

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We consider reduced Hsieh-Clough-Tocher basis functions with respect to a splitting into subtriangles at an arbitrary interior point of the original triangular element. This article gives a proof that the second derivatives of those functions, which in general may jump at the subtriangle boundaries, do not jump at the splitting point.
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18

Rumpler, Romain. "Efficient finite element approach for structural-acoustic applicationns including 3D modelling of sound absorbing porous materials." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00726915.

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In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. Reduced models offer the possibility to enhance the resolution of such complex problems. However, their applicability to porous materials remained
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19

Chatzis, Ilias. "Boundary integral equation method in transient elastodynamics : techniques to reduce computational costs." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249633.

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20

Boyaval, Sébastien. "Mathematical modelling and numerical simulation in materials science." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00499254.

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In a first part, we study numerical schemes using the finite-element method to discretize the Oldroyd-B system of equations, modelling a viscoelastic fluid under no flow boundary condition in a 2- or 3- dimensional bounded domain. The goal is to get schemes which are stable in the sense that they dissipate a free-energy, mimicking that way thermodynamical properties of dissipation similar to those actually identified for smooth solutions of the continuous model. This study adds to numerous previous ones about the instabilities observed in the numerical simulations of viscoelastic fluids (in pa
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21

Meesala, Vamsi Chandra. "Nonlinear Effects in Contactless Ultrasound Energy Transfer Systems." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101752.

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Ultrasound acoustic energy transfer (UAET) is an emerging contactless technology that offers the capability to safely and efficiently power sensors and devices while eliminating the need to replace batteries, which is of interest in many applications. It has been proposed to recharge and communicate with implanted medical devices, thereby eliminating the need for invasive and expensive surgery and also to charge sensors inside enclosed metal containers typically found in automobiles, nuclear power plants, space stations, and aircraft engines. In UAET, energy is transferred through the receptio
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22

Rumpler, Romain. "Efficient Finite Element Approach for Structural-Acoustic Applications including 3D modelling of Sound Absorbing Porous Materials." Doctoral thesis, KTH, MWL Numerisk akustik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-90335.

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In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. Reduced models offer the possibility to enhance the resolution of such complex problems. However, their applicability to porous materials remained
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23

Garlapati, Revanth Reddy. "Reduced basis method for Boltzmann equation." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39218.

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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2006.<br>Includes bibliographical references (p. 103-106).<br>The main aim of the project is to solve the BGK model of the Knudsen parameterized Boltzmann equation which is 1-d with respect to both space and velocity. In order to solve the Boltzmann equation, we first transform the original differential equation by replacing the dependent variable with another variable, weighted with function t(y); next we obtain a Petrov Galerkin weak form of this new transformed equation. To obtain a stable
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24

Fjellstedt, Christoffer. "Methods for including stiffness parameters from reduced finite element models in simulations of multibody systems." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387499.

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Two methods using lumped element (lumped parameter) methods to model flexible bodies have been presented. The methods are based on the concept of using a Guyan reduced stiffness matrix to describe the elasticity of a body. The component to be modeled has been divided into two parts using FE software and the mass and inertia tensor for the respective part of the component have been retrieved. The first method has been based on including the elements from the stiffness matrix in compliant constraints. The compliant constraints have been derived and a prototype has been implemented in MATLAB. It
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25

Badrous, Therese, and Ebba Lund. "Reduced stress method for steel in class 4 cross-sections : Evaluation of the reduced stress method for a railway bridge." Thesis, KTH, Byggteknik och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302525.

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The effective cross-section method, also called reduced cross-section method is generally used for steel in class 4 cross-sections in considering local buckling. This method is a bit complicated and time consuming, which often leads to engineers not using profiles in class 4 cross-sections. The reduced stress method is an alternative method for handling slender steel cross-sections. These two methods are described in the Eurocode, of which the latter is less described. The national annex states that the reduced stress method should not be used, however, without explanation to the general recom
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26

Ye, Jianjun. "Compression strength of unstiffened elements in cold-reduced high strength steel." Thesis, The University of Sydney, 2005. https://hdl.handle.net/2123/27906.

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Compression strength of unstiffened elements in cold—reduced high strength steel G550 and G450 steel to Australian Standard AS 1397-1993 are investigated experimentally and theoretically in this thesis. The thesis describes two series of tests. The first one is material property tests performed on tension and compression coupons cut from high strength steel sheet in 0.6 mm or 1.0 mm thickness with nominal yield stress of 550 MPa and 1.5 mm thickness with nominal yield stress of 450 MPa. The second is compression tests performed on stub angles cut from high strength steel sheet in 0.6
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27

Giannopoulos, Vassileios S. "Progressive delamination analysis of layered composite plates using dimensionally reduced finite elements." Thesis, Cranfield University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397039.

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28

BORGES, WESDEN de A. "Estudos de simulacao computacional do processo de reducao de UF4 a uranio metalico." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9952.

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Made available in DSpace on 2014-10-09T12:33:09Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:16Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Pomplun, Jan [Verfasser]. "Reduced basis method for electromagnetic scattering problems / Jan Pomplun." Berlin : Freie Universität Berlin, 2010. http://d-nb.info/1024541436/34.

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30

Pau, George Shu Heng. "Reduced basis method for quantum models of crystalline solids." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40376.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 203-213).<br>Electronic structure problems in solids usually involve repetitive determination of quantities of interest, evaluation of which requires the solution of an underlying partial differential equation. We present in this thesis the application of the reduced basis method in accurate and rapid evaluations of outputs associated with some nonlinear eigenvalue problems related to electronic structure calculations. The reduced basis method provides a sys
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31

Литвинов, Д. Ю. "Дослідження жорсткості металообробних верстатів з паралельною кінематикою за допомогою чисельних методів". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/75508.

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Кваліфікаційна робота магістра становить 93 сторінки, в тому числі 80 рисунків, сім таблиць, бібліографії із 24 джерел на двох сторінках, двох додатків на 19 сторінках. Мета роботи. Запропонувати раціональну конструкцію верстатів з паралельною кінематикою за умови їх виробництва та застосування в Сумській області шляхом перевірки її жорсткості на основі застосування чисельних методів. Для досягнення поставленої мети в роботі були встановлені та вирішенні наступні завдання: 1) виконати аналіз виробів під час виготовленні яких можуть бути задіяні верстати з паралельною кінематикою; 2) виконати
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Laurent, Philippe. "Méthodes d'accéleration pour la résolution numérique en électrolocation et en chimie quantique." Thesis, Nantes, Ecole des Mines, 2015. http://www.theses.fr/2015EMNA0122/document.

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Cette thèse aborde deux thématiques différentes. On s’intéresse d’abord au développement et à l’analyse de méthodes pour le sens électrique appliqué à la robotique. On considère en particulier la méthode des réflexions permettant, à l’image de la méthode de Schwarz, de résoudre des problèmes linéaires à partir de sous-problèmes plus simples. Ces deniers sont obtenus par décomposition des frontières du problème de départ. Nous en présentons des preuves de convergence et des applications. Dans le but d’implémenter un simulateur du problème direct d’électrolocation dans un robot autonome, on s’in
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Salmanoff, Jason. "A Finite Element, Reduced Order, Frequency Dependent Model of Viscoelastic Damping." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36518.

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This thesis concerns itself with a finite element model of nonproportional viscoelastic damping and its subsequent reduction. The Golla-Hughes-McTavish viscoelastic finite element has been shown to be an effective tool in modeling viscoelastic damping. Unlike previous models, it incorporates physical data into the model in the form of a curve fit of the complex modulus. This curve fit is expressed by minioscillators. The frequency dependence of the complex modulus is accounted for by the addition of internal, or dissipation, coordinates. The dissipation coordinates make the viscoelastic
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34

Pereira, Da Silva Luciano. "Atténuation du bruit et des vibrations de structures minces par dispositifs piézoélectriques passifs : modèles numériques d'ordre réduit et optimisation." Thesis, Paris, CNAM, 2014. http://www.theses.fr/2015CNAM0944/document.

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Dans le cadre de la lutte contre les nuisances sonores et vibratoires, cette thèse porte sur la modélisation numérique des structures amorties par dispositifs piézoélectriques shuntés. La première partie du travail concerne la modélisation par éléments finis de structures en vibrations avec des pastilles piézoélectriques shuntées. Dans un premier temps, une formulation éléments finis originale, qui utilise des variables électriques globales (différence de potentiel et charge dans chaque pastille piézoélectrique), est analysée et validée. Dans un second temps, différentes stratégies de réductio
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Tambasco, Giuseppe. "Methods to predict and reduce trace metal levels in lettuce grown on contaminated urban soils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ44294.pdf.

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36

Starkloff, Hans-Jörg. "Stochastic finite element method with simple random elements." Universitätsbibliothek Chemnitz, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200800596.

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We propose a variant of the stochastic finite element method, where the random elements occuring in the problem formulation are approximated by simple random elements, i.e. random elements with only a finite number of possible values.
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Pics’, N. A., V. I. Mokryi, R. F. Fedoriv, and O. V. Cehelnik. "Method of classification of integumentary elements of landscape." Thesis, Вид-во СумДУ, 2006. http://essuir.sumdu.edu.ua/handle/123456789/11765.

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38

Ulman, Jaroslav. "Návrh a optimalizace ojnice motoru závodního automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229133.

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This master thesis describes the design and optimization of connecting rod motor racing car. At the beginning of the whole work is a 3D-model of rods, from which then the whole work is based. Then it analyzes the current model of stress and on the basis of the results are made structural changes to the solution of rods. Newly adapted connecting rod is again analyzed using FEM and newly obtained results are compared with results of the original model of connecting rods. The conclusion deals with sensitivity analysis of selected parameters of rods and their potential effect on the resulting chan
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He, Xiaoming. "Bilinear Immersed Finite Elements For Interface Problems." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27819.

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In this dissertation we discuss bilinear immersed finite elements (IFE) for solving interface problems. The related research works can be categorized into three aspects: (1) the construction of the bilinear immersed finite element spaces; (2) numerical methods based on these IFE spaces for solving interface problems; and (3) the corresponding error analysis. All of these together form a solid foundation for the bilinear IFEs. The research on immersed finite elements is motivated by many real world applications, in which a simulation domain is often formed by several materials separated from e
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Kumar, Ashutosh. "Towards a Reduced-Scaling Method for Calculating Coupled Cluster Response Properties." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83846.

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One of the central problems limiting the application of accurate {em ab initio} methods to large molecular systems is their high computational costs, i.e., their computing and storage requirements exhibit polynomial scaling with the size of the system. For example, the coupled cluster singles and doubles method with the perturbative inclusion of triples: the CCSD(T) model, which is considered to be the ``gold standard'' of quantum chemistry scales as ${cal O}(N^7)$ in its canonical formulation, where $N$ is a measure of the system size. However, the steep scaling associated with these methods
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41

Dag, Idris. "Studies of B-spline finite elements." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358041.

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42

Purdie, Stuart. "Magnetic ordering in systems of reduced dimensionality." Thesis, University of St Andrews, 2005. http://hdl.handle.net/10023/12927.

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The magnetic behaviour of thin films of (111) FCC structures and (0001) corundum structured materials were studied by the mean field analysis and some Monte Carlo simulation. These models were conditioned on a mapping from first principles calculations to the Ising model. The effect of the suggested octopolar reconstruction for the polar (111) surfaces of FCC was also examined.
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43

Karna, Ranju Rani. "Mechanistic understanding of biogeochemical transformations of trace elements in contaminated minewaste materials under reduced conditions." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/18261.

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Doctor of Philosophy<br>Department of Agronomy<br>Ganga M. Hettiarachchi<br>The milling and mining operations of metal ores are one of the major sources of heavy metal contamination at earth’s surface. Due to historic mining activities conducted in the Tri-State mining district, large area of land covered with mine waste, and soils enriched with lead (Pb), zinc (Zn) and cadmium (Cd) remain void of vegetation influencing ecosystem and human health. It has been hypothesized that if these minewaste materials are disposed of in the flooded subsidence pits; metals can be transformed into their sulf
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44

Rabadi, Kairas. "PERFORMANCE OF INTERFACE ELEMENTS IN THE FINITE ELEMENT METHOD." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2188.

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The objective of this research is to assess the performance of interface elements in the finite element method. Interface elements are implemented in the finite element codes such as MSC.NASTRAN, which is used in this study. Interface elements in MSC.NASTRAN provide a tool to transition between a shell-meshed region to another shell-meshed region as well as from a shell-meshed region to a solid-meshed region. Often, in practice shell elements are layered on shell elements or on solid elements without the use of interface elements. This is potentially inaccurate arising in mismatched degrees of
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45

PEIXOTO, HELVIO DE FARIAS COSTA. "A FAST MULTIPOLE METHOD FOR HIGH ORDER BOUNDARY ELEMENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34740@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>BOLSA NOTA 10<br>Desde a década de 1990, o Método Fast Multipole (FMM) tem sido usado em conjunto com o Métodos dos Elementos de Contorno (BEM) para a simulação de problemas de grande escala. Este método utiliza expansões em série de Taylor para aglomerar pontos da discretização do contorno, de forma a reduzir o tempo computacional necessário para completar a simulação. Ele se tornou uma ferramenta bastante importante
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Ozgur, Soner. "Reduced Complexity Sequential Monte Carlo Algorithms for Blind Receivers." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10518.

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Monte Carlo algorithms can be used to estimate the state of a system given relative observations. In this dissertation, these algorithms are applied to physical layer communications system models to estimate channel state information, to obtain soft information about transmitted symbols or multiple access interference, or to obtain estimates of all of these by joint estimation. Initially, we develop and analyze a multiple access technique utilizing mutually orthogonal complementary sets (MOCS) of sequences. These codes deliberately introduce inter-chip interference, which is naturally eliminat
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Schiela, Anton. "The control reduced interior point method : a function space oriented algorithmic approach /." München : Hut, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015438070&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Vidal, Codina Ferran. "A reduced-basis method for input-output uncertainty propagation in stochastic PDEs." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82417.

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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 123-132).<br>Recently there has been a growing interest in quantifying the effects of random inputs in the solution of partial differential equations that arise in a number of areas, including fluid mechanics, elasticity, and wave theory to describe phenomena such as turbulence, random vibrations, flow through porous media, and wave propagation through random media. Monte-Carlo based sampling methods, ge
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Martin, Marie. "Modélisations fluides pour les plasmas de fusion : approximation par éléments finis C1 de Bell." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00845922.

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Les instabilités fluides peuvent dégrader le confinement du plasma au sein des tokamaks. Étant données les échelles spatio-temporelles, on choisit les modèles fluides obtenus à partir de la dérivation des modèles cinétiques. On dérive plusieurs modèles hiérarchiques de la MagnétoHydroDynamique (MHD) et en particulier les modèles de la MHD réduite du Current Hole et de l'équilibre de Grad-Shafranov. Une des difficulté de l'ensemble de ces modèles est de respecter l'équation modélisant l'absence de monopôles magnétiques. Pour assurer cette condition en tout point du domaine, le champ magnétique
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Atwell, Jeanne A. "Proper Orthogonal Decomposition for Reduced Order Control of Partial Differential Equations." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26985.

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Numerical models of PDE systems can involve very large matrix equations, but feedback controllers for these systems must be computable in real time to be implemented on physical systems. Classical control design methods produce controllers of the same order as the numerical models. Therefore, emph{reduced} order control design is vital for practical controllers. The main contribution of this research is a method of control order reduction that uses a newly developed low order basis. The low order basis is obtained by applying Proper Orthogonal Decomposition (POD) to a set of functional gains
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