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Dissertations / Theses on the topic 'High Order Displacement Field'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Chee, Clinton Yat Kuan. "STATIC SHAPE CONTROL OF LAMINATED COMPOSITE PLATE SMART STRUCTURE USING PIEZOELECTRIC ACTUATORS ©." Thesis, The University of Sydney, 2000. http://hdl.handle.net/2123/709.

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The application of static shape control was investigated in this thesis particularly for a composite plate configuration using piezoelectric actuators. A new electro-mechanically coupled mathematical model was developed for the analysis and is based on a third order displacement field coupled with a layerwise electric potential concept. This formulation, TODL, is then implemented into a finite element program. The mathematical model represents an improvement over existing formulations used to model intelligent structures using piezoelectric materials as actuators and sensors. The reason is TOD

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2

Chee, Clinton Yat Kuan. "STATIC SHAPE CONTROL OF LAMINATED COMPOSITE PLATE SMART STRUCTURE USING PIEZOELECTRIC ACTUATORS �." University of Sydney. Aeronautical Engineering, 2000. http://hdl.handle.net/2123/709.

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The application of static shape control was investigated in this thesis particularly for a composite plate configuration using piezoelectric actuators. A new electro-mechanically coupled mathematical model was developed for the analysis and is based on a third order displacement field coupled with a layerwise electric potential concept. This formulation, TODL, is then implemented into a finite element program. The mathematical model represents an improvement over existing formulations used to model intelligent structures using piezoelectric materials as actuators and sensors. The reason is TOD

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3

JIMENEZ, HERNAN RENATO GAVILANES. "ANALYSIS OF THE DISPLACEMENT FIELD IN THE STABILITY OF HIGH-RISE MINING SLOPES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1250@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A avaliação da estabilidade do talude da Mina Robert (Canadá) é feita através do campo de deslocamentos de marcos superficiais e subsuperficiais e possíveis mecanismos de ruptura obtidos a partir da análise tensão- deformação usando-se o programa computacional FLAC (V. 3.30). Adotando-se o emprego dos modelos constitutivos elástico perfeitamente plástico e elasto-plástico com amolecimento, são calculados o fator de segurança e a porcentagem da região de plastificação, e são definidas as características de comportamento ci

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4

Kong, Fanqi. "High-Order Harmonic Generation with Structured Beams." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39609.

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The generation of high-order harmonics opened an era of attosecond science wherein coherent light bursts are used to probe dynamic processes in matter with a time resolution short enough to resolve the motions of electrons. It enabled the development of extreme ultraviolet (XUV) and X-ray table-top sources with both temporal and spatial coherence, which provides the ability to shape the temporal and spatial structure of the XUV pulses. Scientists developed techniques to control and measure the temporal structure high harmonic emissions. These techniques exploited control of the driving laser

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5

Alharbi, Abdullah F. "High-order Harmonic Spectroscopy of Cyclic Organic Molecules." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35179.

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Understanding the electronic structure and dynamics of cyclic organic molecules is becoming increasingly the subject of investigations from different perspectives due to their unique chemical and physical properties. Since they are largely involved in the biochemistry of living organisms, studies on this class of compounds are also valuable to understand biologically relevant complex systems. Compared to other techniques, high-order harmonic generation (HHG) has been increasingly considered as a powerful spectroscopic tool with Angstrom spatial and attosecond temporal resolutions. This thesis

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6

Zhao, Lishan. "Uniaxial strain and high magnetic field investigation on materials with novel order parameters." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9075.

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At low temperatures, strongly correlated materials, which typically contain partially filled d- or f-electron shells, often exhibit phases with interesting properties, which may be of both research value and technological significance. The mechanisms of phase formation in them if could be clarified, are believed to be able to provide important insights not only into physics but also into the design of new materials. In this thesis, the experimental study of two strongly correlated materials, Sr₂RuO₄ and CeAuSb₂ is presented. Sr₂RuO₄ is an unconventional superconductor, and a strong candidate f

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7

Kajberg, Jörgen. "Displacement field measurement using digital speckle photography for characterisation of materials subjected to large deformations and high strain rates /." Luleå, 2003. http://epubl.luth.se/1402-1544/2003/35.

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8

Pfeiffer, Robert. "HIGH-ORDER INTEGRAL EQUATION METHODS FOR QUASI-MAGNETOSTATIC AND CORROSION-RELATED FIELD ANALYSIS WITH MARITIME APPLICATIONS." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/119.

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This dissertation presents techniques for high-order simulation of electromagnetic fields, particularly for problems involving ships with ferromagnetic hulls and active corrosion-protection systems. A set of numerically constrained hexahedral basis functions for volume integral equation discretization is presented in a method-of-moments context. Test simulations demonstrate the accuracy achievable with these functions as well as the improvement brought about in system conditioning when compared to other basis sets. A general method for converting between a locally-corrected Nyström discretizat

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9

Kern, Alexander Marco. "Quantification of the performance of 3D sound field reconstruction algorithms using high-density loudspeaker arrays and 3rd order sound field microphone measurements." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/77516.

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The development and improvement of 3-D immersive audio is gaining momentum through the growing interest in virtual reality. Possible applications reach from recreating real world environments to immersive concerts and performances to exploiting big data acoustically. To improve the immersive experience several measures can be taken. The recording of the sound field, the spatialization and the development of the loudspeaker arrays are some of the greatest challenges. In this thesis, these challenges for improving immersive audio will be explored. First, there will be a short introduction about

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10

Petrova, Rumyana. "Quantitative High-Angle Annular Dark Field Scanning Transmission to Electron Microscopy for Materials Science." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4304.

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Scanning transmission electron microscopy (STEM) has been widely used for characterization of materials; to identify micro- and nano-structures within a sample and to analyze crystal and defect structures. High-angle annular dark field (HAADF) STEM imaging using atomic number (Z) contrast has proven capable of resolving atomic structures with better than 2 A lateral resolution. In this work, the HAADF STEM imaging mode is used in combination with multislice simulations. This combination is applied to the investigation of the temperature dependence of the intensity collected by the HAADF detect

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11

Jayatilake, Mohan L. "Optimization and construction of passive shim coils for human brain at high field MRI." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313772791.

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12

Lin, Nan. "Application of attosecond pulses to high harmonic spectroscopy of molecules." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-01064138.

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High-order Harmonic Generation (HHG) is an extreme nonlinear process that can be intuitively understood as the sequence of 3 steps: i) tunnel ionization of the target atom/molecule, creating an electronic wave packet (EWP) in the continuum, ii) acceleration of the EWP by the strong laser field and iii) recombination to the core with emission of an attosecond burst of XUV coherent light. HHG thus provides a tunable ultrashort tabletop source of XUV/Soft X-ray radiation on attosecond time scale for applications ('direct' scheme). At the same time, it encodes coherently in the XUV radiation the s

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13

Widdifield, Cory. "Multinuclear Solid-State Magnetic Resonance Studies on ‘Exotic’ Quadrupolar Nuclei: Acquisition Methods, High-Order Effects, Quantum Chemical Computations, and NMR Crystallography." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20722.

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This dissertation attempts to extend the classes of halogen-containing systems which may be studied using solid-state nuclear magnetic resonance (SSNMR). As line shape broadening due to the quadrupolar interaction (QI) scales inversely with the applied field, high-field magnet technology is indispensable for this research. Combining advanced radiofrequency pulse sequences with high-field wideline data acquisition allowed for the collection of very broad SSNMR signals of all quadrupolar halogen nuclei (i.e., 35/37Cl, 79/81Br and 127I) within a reasonable amount of experimental time. The init

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14

Beaulieu, Samuel. "Probing femtosecond and attosecond electronic and chiral dynamics : high-order harmonic generation, XUV free induction decay, photoelectron spectroscopy and Coulomb explosion." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0063/document.

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Ce manuscrit de thèse s'articule autour de l'étude de l'interaction entre des impulsions lumineuses ultra brèves et des atomes ainsi que des molécules polyatomiques et chirales en phase gazeuse. En utilisant des techniques développées en physique attoseconde ainsi qu'en femtochimie, notre objectif général est de parvenir à une meilleure compréhension des dynamiques ultrarapides photoinduites dans la matière. Pour ce faire, nous avons développé des sources de lumière à ultra brèves dans le proche infrarouge et l’infrarouge moyen, qui ont été utilisées pour construire une source de rayons X dans

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15

Bull, James. "Application of Quantum Mechanics to Fundamental Interactions in Chemical Physics: Studies of Atom-Molecule and Ion-Molecule Interactions Under Single-Collision Conditions: Crossed Molecular Beams; Single-Crystal Mössbauer Spectroscopy: Microscopic Tensor Properties of ⁵⁷Fe Sites in Inorganic Ferrous High-Spin Compounds." Thesis, University of Canterbury. Department of Chemistry, 2010. http://hdl.handle.net/10092/4292.

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As part of this project and in preparation for future experimental studies of gas-phase ion-molecule reactions, extensive modification and characterization of the crossed molecular beam machine in the Department of Chemistry, University of Canterbury has been carried out. This instrument has been configured and some preliminary testing completed to enable the future study of gas-phase ion-molecule collisions of H⁺₃ and Y⁻ (Y = F, Cl, Br) with dipole-oriented CZ₃X (Z = H, F and X = F, Cl, Br). Theoretical calculations (ab initio and density functional theory) are reported on previously experime

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16

He, Yixuan. "Nucléation et magnétisme des métaux liquides Co-B en surfusion sous champ magnétique intense." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY087.

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Dans le cadre du présent travail, une étude approfondie a été menée sur les alliages Co-B en termes d'évolution de la microstructure lors d'une solidification hors équilibre avec ou sans champ magnétique ainsi que sur une transition liquide-liquide induite par la température.Un alliage hypereutectique Co-20at.%B a été sous-refroidi par la technique de l'encapsulation vitreuse. Une transition de l'hypereutectique à l'hypoeutectique a été trouvée à un sous-refroidissement critique de ∆T=119 K. Quand ∆T<119 K, une phase dendritique directionnelle primaire β-Co3B entourée par l'eutectique lamel

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17

Hellström, Jonas. "Nanosecond optical parametric oscillators and amplifiers based on periodically poled KTiOPO4." Doctoral thesis, KTH, Physics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3269.

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<p>Optical parametric oscillators (OPOs) and optical parametricamplifiers (OPAs) constitute a class of optical frequencyconverting devices that have many possible applications, e.g.in range finding, molecular spectroscopy and medicine. They canconvert the frequency of the incident pump field with highefficiency, and generate two waves at new frequencies that willbe continuously tuneable over a wide spectral range. Virtuallyany wavelengths within the transparency region of the nonlinearmaterial can be generated if the material can bequasi-phasematched (QPM). In addition, QPM gives thepossibilit

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18

Janod, Étienne. "Elaboration et proprietes thermodynamiques de supraconducteurs a haute temperature : le cas de yba#2cu#3o#7#-#d et bi#2#+#xsr#2#-#xcuo#6#+#d." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10234.

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Cette etude concerne deux phases, yba#2cu#3o#7#-# et bi#2#+#xsr#2#-#xcuo#6#+#, archetypes des supraconducteurs a haute temperature. Leur anisotropie, respectivement moins de 10 et plus de 200, et leur temperature critique, 92k et moins de 10 k, les situent aux deux extremes de l'eventail des proprietes de ces composes. Cette etude est axee sur leurs proprietes thermodynamiques, chaleur specifique et aimantation. Un travail preliminaire sur des ceramiques d'yba#2cu#3o#7#-# presentant des transitions dedoublees a permis de selectionner les conditions pour obtenir une transition supraconductrice

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19

Barbut, Jean-Marc. "Texturation d'YBa2Cu3O(7-[delta]) par fusion de zone sous champ magnétique : détermination par mesure de courant critique de son diagramme de phase dans le plan [H,[THETA]] à 77 K : mise en évidence par mesures résistives de l'existence en champ nul d'une transition du 1er ordre dans l'état supraconducteur." Grenoble 1, 1994. http://www.theses.fr/1994GRE10049.

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Les applications en courant fort de la ceramique supraconductrice a haute temperature critique yba#2cu#3o#7## necessitent l'amelioration des qualites supraconductrices et l'augmentation de la taille des materiaux synthetises. Un nouveau procede de synthese, combinant la fusion de zone et l'action du champ magnetique, permet de produire des conducteurs de grande longueur massivement orientes. Cette methode autorise la synthese de barreaux d'yba#2cu#3o#7## de plusieurs centimetres de long, composes d'un petit nombre de grains avec une faible desorientation des plans a,b, la direction de l'axe c

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20

Fujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.

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Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation.

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21

Seneci, Tommaso. "Displacement Convexity for First-Order Mean-Field Games." Thesis, 2018. http://hdl.handle.net/10754/627746.

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In this thesis, we consider the planning problem for first-order mean-field games (MFG). These games degenerate into optimal transport when there is no coupling between players. Our aim is to extend the concept of displacement convexity from optimal transport to MFGs. This extension gives new estimates for solutions of MFGs. First, we introduce the Monge-Kantorovich problem and examine related results on rearrangement maps. Next, we present the concept of displacement convexity. Then, we derive first-order MFGs, which are given by a system of a Hamilton-Jacobi equation coupled with a transpor

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22

Veenaranjini, S. M. "Low-Order Laminated Lock-Free Beam And Plate Elements Based On Coupled Displacement Field." Thesis, 2004. http://hdl.handle.net/2005/313.

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This study aims to investigate the behaviour of low-order beam and plate elements especially for their application to laminated structures. The merits and dements of the existing elements are brought out and new low-order elements with better interpolation polynomials are proposed. Two new beam elements are proposed for laminated composite beams that yield better representation of twist due to material coupling. Out of the two elements developed, one is based on the conventional formulation and the other on the coupled-field formulation, both capturing material induced coupling. The beam deve

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23

"Analysis of the displacement field in the stability of high-rise mining slopes." Tese, MAXWELL, 1999. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=1250:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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24

Moy, Pedro Henrique Rocha. "Performance Analysis of High-Order Numerical Methods for Time-Dependent Acoustic Field Modeling." Thesis, 2012. http://hdl.handle.net/10754/238360.

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The discretization of time-dependent wave propagation is plagued with dispersion in which the wavefield is perceived to travel with an erroneous velocity. To remediate the problem, simulations are run on dense and computationally expensive grids yielding plausible approximate solutions. This work introduces an error analysis tool which can be used to obtain optimal simulation parameters that account for mesh size, orders of spatial and temporal discretizations, angles of propagation, temporal stability conditions (usually referred to as CFL conditions), and time of propagation. The classical c

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25

Li, Jizhou. "Locally Mass-Conservative Method With Discontinuous Galerkin In Time For Solving Miscible Displacement Equations Under Low Regularity." Thesis, 2013. http://hdl.handle.net/1911/71985.

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The miscible displacement equations provide the mathematical model for simulating the displacement of a mixture of oil and miscible fluid in underground reservoirs during the Enhance Oil Recovery(EOR) process. In this thesis, I propose a stable numerical scheme combining a mixed finite element method and space-time discontinuous Galerkin method for solving miscible displacement equations under low regularity assumption. Convergence of the discrete solution is investigated using a compactness theorem for functions that are discontinuous in space and time. Numerical experiments illustrate that

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26

Rautenbach, Helperus Ritzema. "An empirically derived system for high-speed rendering." Thesis, 2012. http://hdl.handle.net/2263/28196.

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This thesis focuses on 3D computer graphics and the continuous maximisation of rendering quality and performance. Its main focus is the critical analysis of numerous real-time rendering algorithms and the construction of an empirically derived system for the high-speed rendering of shader-based special effects, lighting effects, shadows, reflection and refraction, post-processing effects and the processing of physics. This critical analysis allows us to assess the relationship between rendering quality and performance. It also allows for the isolation of key algorithmic weaknesses and possible

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27

Cajiao, Velez Felipe. "Engineering and Control of Quantum Processes by Short Laser Pulses." Doctoral thesis, 2016. https://depotuw.ceon.pl/handle/item/1854.

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28

Sivis, Murat. "Extreme-ultraviolet light generation in plasmonic nanostructures." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E08-0.

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