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Dissertations / Theses on the topic 'Anisotropy'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chen, Xiaoming. "Two-dimensional constrained anisotropic inversion of magnetotelluric data." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6316/.

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Tectonic and geological processes on Earth often result in structural anisotropy of the subsurface, which can be imaged by various geophysical methods. In order to achieve appropriate and realistic Earth models for interpretation, inversion algorithms have to allow for an anisotropic subsurface. Within the framework of this thesis, I analyzed a magnetotelluric (MT) data set taken from the Cape Fold Belt in South Africa. This data set exhibited strong indications for crustal anisotropy, e.g. MT phases out of the expected quadrant, which are beyond of fitting and interpreting with standard isotr

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2

Adams, Amy Lynn. "Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90036.

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Thesis: Ph. D. in Geotechnical and Geoenvironmental Engineering, Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 313-322).<br>Permeability anisotropy (the ratio of the horizontal to vertical permeability) is an important parameter used in sedimentary basin models and geotechnical design to model fluid flow, locate hydrocarbon reserves and estimate stress and pressure evolution. The magnitude of the permeability anisotropy for a given mudrock is difficult to mea

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3

Rostamabad, Houshang Mansouri. "Distinguishing stress-induced anisotropy from fracture-induced anisotropy, and the implications of stress-induced anisotropy for time-lapse seismic." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/108.

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4

Ouahioune, Nedjma. "MOKE set-upto measure magnetic anisotropy : MOKE set-upto measure magnetic anisotropy." Thesis, Uppsala universitet, Materialfysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414388.

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5

Wack, Michael Richard. "Anisotropy of magnetic remanence." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-145717.

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6

Robson, Martin. "The Cosmic Anisotropy Telescope." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319559.

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7

Wheatley, Richard James. "The anisotropy of repulsion." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359829.

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8

Eisenbach, Markus. "Magnetic anisotropy in nanostructures." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364862.

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9

Walsh, James Paul Slater. "Anisotropy in molecular magnetism." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/anisotropy-in-molecular-magnetism(11474b91-0d3d-4b0a-97cd-214d1713674e).html.

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A collection of studies are reported that focus on the examination of exchange interactions in complexes containing paramagnetic ions with a large magnetic anisotropy. A number of complementary techniques are used to analyse the complicated systems that arise, including high-field high-frequency electron paramagnetic resonance, inelastic neutron scattering, SQUID magnetometry, and ab initio calculations. The nuclearity of the complexes ranges from dimetallic, to trimetallic, to octametallic. A family of five water- and carboxylate-bridged nickel(II) dimetallics are the focus of a magneto-struc

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10

Thorsteinsson, Throstur. "Anisotropy of ice Ih : development of fabric and effects of anisotropy on deformation /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6844.

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11

Chen, Christopher H. K. "Anisotropy of solar wind turbulence." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6375.

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As well as being of fundamental interest, understanding plasma turbulence is important for many areas of astrophysics and space physics that remain to be fully understood, such as accretion disk dynamics, the origin of cosmic rays and coronal heating. The anisotropy with respect to the magnetic fi eld is central to understanding plasma turbulence, but this has only recently started to be measured in detail. The solar wind provides a unique opportunity to study this anisotropy due to the range of high precision in situ measurements available. In this thesis, the anisotropy of solar wind turbule

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12

Chakravarty, Subhashish. "Bayesian surface smoothing under anisotropy." Diss., University of Iowa, 2007. http://ir.uiowa.edu/etd/169.

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13

Fard, Samad Moemen Bellah. "Modelling anisotropy in electrotechnical steels." Thesis, Cardiff University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263551.

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14

Nordquist, Taylor James. "Permeability anisotropy of resedimented mudrocks." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99578.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 257-260).<br>Permeability anisotropy (ratio of horizontal to vertical permeability) is an important but uncertain parameter used in characterizing underground formations. While it is a fairly unknown parameter, it is integral for the petroleum industry, where a greater permeability anisotropy understanding can greatly aid in basin modelling, pore pressure prediction, and borehole stability. This rese

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15

Lam, Yukyam 1982. "Dark energy and CMB anisotropy." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32743.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 59-60).<br>According to the WMAP and earlier COBE observations, the Cosmic Microwave Background (CMB) anisotropy power on large angular scales appears to be significantly lower than predicted by the standard model of cosmology. We propose a scalar field model of the dark energy as a mechanism for suppressing low l multipoles through late-Universe evolution of metric fluctuations and the integrated Sachs-Wolfe (ISW) effect. We find that for a constant dark energy equation of

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Sugita, Hikaru. "Anisotropy of Osteoporotic Cancellous Bone." Kyoto University, 2000. http://hdl.handle.net/2433/157004.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(医学)<br>乙第10371号<br>論医博第1709号<br>新制||医||742(附属図書館)<br>UT51-2000-F437<br>(主査)教授開祐司, 教授堤定美, 教授岡正典<br>学位規則第4条第2項該当

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Wang, Nian. "Intrinsic versus extrinsic seismic anisotropy." Paris, Institut de physique du globe, 2014. http://www.theses.fr/2014GLOB0101.

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18

Li, Liang-shi. "Anisotropy in CdSe quantum rods." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/827094-DOIqqD/native/.

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Thesis (Ph.D.); Submitted to the University of California at Berkeley, Berkeley, CA (US); 1 Sep 2003.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--55023" Li, Liang-shi. USDOE Director. Office of Science. Office of Basic Energy Sciences (US) 09/01/2003. Report is also available in paper and microfiche from NTIS.

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Azevedo, Carlos Alberto Cabral de. "Formulação alternativa para análise de domínios não-homogêneos e inclusões anisotrópicas via MEC." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-18102007-110753/.

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Este trabalho trata da análise de problemas planos de chapa compostos por materiais anisotrópicos, definidas em uma região ou no domínio por completo, utilizando-se o método dos elementos de contorno. As soluções fundamentais para problemas anisotrópicos, embora existentes, mostram-se difíceis de serem utilizadas devido à complexidade de sua formulação matemática ou da necessidade de se encontrar partes da solução numericamente. Nesse sentido, a formulação alternativa mostrada nesse trabalho permite o estudo de meios anisotrópicos utilizando-se as soluções fundamentais para meios isotrópicos n

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20

El-Khatib, Fatima. "Synthèse, caractérisation et études magnétiques de complexes de Co(II) et de Ni(II) avec des ligands de type cryptands." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS018/document.

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Les molécules-aimants sont une classe d’objets aux propriétés très singulières, et dont les applications envisagées, certes sans doute lointaines, sont multiples. Dans le cadre du stockage de l’information, la principale propriété de ces molécules est le blocage de leur aimantation qui leur confère les propriétés de mémoire au niveau de la molécule unique. Théoriquement l’existence d’une aimantation spontanée au niveau d’une molécule de spin S ne peut exister que s’il y a une levée de dégénérescence à champ nul (ZFS) qui sépare les états de spin ±mS. Dans ce contexte, les molécules-aimants peu

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21

Ferraro, Filippo Jacopo. "Magnetic anisotropies and exchange bias in ultrathin cobalt layers for the tunnel anisotropic magnetoresistance." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY086/document.

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Dans le cadre de l’étude des phénomènes magnétiques et de la spintronique qui sont présents aux échelles nanoscopiques nous avons étudié différents aspects des structures asymétriques de Pt/Co/AlOx. L’un des objectifs de cette thèse est le contrôle de l’oxydation et des propriétés magnétiques de ces multicouches. Nous avons combiné les mesures de structures (réflexion de Rayon-X), transports (Effet Hall anormal), et magnétiques (VSM-SQUID) afin de déterminer les rôles des effets magnétiques et d’interfaces. Un objectif était d’analyser le rôle de quelques monocouches (MCs) de CoO (qui peut se

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22

Ballot, Noémie. "Matériaux nanométriques à base de métaux 3d (Fe, Co, Ni) : Nouvelles voies de synthèse et caractérisations." Thesis, Paris 13, 2014. http://www.theses.fr/2014PA132065/document.

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L’intérêt grandissant envers les nanomatériaux a base des métaux de transition 3d comme le cobalt, le nickel et le fer trouve son origine dans les propriétés intrinsèques de ces éléments (forte aimantation du fer et constante magnétocristalline élevée du cobalt) combinées aux propriétés particulières offertes par la taille nanométrique et l’anisotropie de ces alliages. Parmi les nombreuses voies de synthèse dites de chimie douce, le procède polyol permet l’élaboration de plusieurs classes de matériaux inorganiques a l’état finement divises (oxydes, hydroxydes et métaux) grâce aux réactions de

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23

Robertson, C. J. "Factors controlling etch anisotropy in plasmas." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843224/.

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The use of radio frequency (rf) plasma techniques to produce fine structures of precise geometry is widespread in the microelectronics industry. An important factor influencing the functionality of fabricated devices is the wall angle of these structures. In certain applications vertical walls are required - for example to minimise mask degradation and maximise gate densities; in others a sloping sidewall is preferred - to minimise stress in metal coatings when making electrical contact through 'via' holes, for instance. This fine control cannot be achieved on micron and sub-micron scale devic

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24

Smith, Andrew Geoffrey Kent. "Cosmic ray anisotropy at high energies." Title page, contents and overview only, 1996. http://hdl.handle.net/2440/18616.

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Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1996

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25

Bali, R. "Exchange anisotropy in magnetic thin films." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596311.

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I have studied Exchange Bias in epitaxial α-Fe<sub>2</sub>O<sub>3</sub> and polycrystalline FeMn and CoMn antiferromagnets coupled to the ferromagnet Permalloy (Ni<sub>81</sub>Fe<sub>19</sub>). Despite the nominal magnetocrystalline anisotropy of Permalloy, surface features such as vicinal steps and roughness induced strong uniaxial anisotropy. Exchange coupling with epitaxial α-Fe<sub>2</sub>O<sub>3</sub> led to a biaxial anisotropy component in the ferromagnet. Anisotropy axes of the biaxial component remained fixed despite applying magnetic field at elevated temperatures. The magnitude of b

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26

Irving, J. C. E. "Seismological studies of inner core anisotropy." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604955.

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In this dissertation I examine the inner core using two complementary seismic perturbations: seismic body waves and free oscillations of the Earth. I investigate the velocity anisotropy present in the inner core by measuring PKPdf-PKPbc and PKPdf-PKPab differential travel time residuals. A model for an inner core with 3.5% cylindrical anisotropy is consistent with the data. However, the data are better fitted by an inner core which is divided into two ‘hemispheres’, an isotropic eastern hemisphere between 14°E and 151°W and western hemisphere which contains 4.4% anisotropy between 151°W and 14

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27

Dyer, S. J. R. "Elastic anisotropy in fibre reinforced composites." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373548.

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28

Chen, Yu. "Towards anisotropy in ordered conducting polymers." Thesis, University of Aberdeen, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312356.

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A new β and <I>N</I>-substituted pyrrole, <I>N</I>-trimethylsilylethoxymethyl-3-methyl-4-pyrrole carboxylate ethyl ester (MPCE-SEM) is synthesised and copolymerised electrochemically with unsubstituted pyrrole to gives free-standing films for conductivity measurements. The electrochemical polymerisation of MPCE-SEM gives only soluble dimers and oligomers rather than polymers because the steric constraints stabilise the oligomeric cation radical of MPCE-SEM. The thiophene monomers containing mesogenic group at the 3-position via an alkyl chain are synthesised and polymerised chemically to give

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29

Seah, Tian Ho. "Anisotropy of resedimented Boston Blue Clay." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14048.

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30

Segovia-Martinez, Manuel. "Texture anisotropy analysis of brain scans." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/844053/.

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Currently, the world population is aging. People over 75 is one of the fastest growing age groups. This is the group most affected by Alzheimer's disease. Reliable early diagnosis and tracking methods are essential to assist therapy and prevention. This research aims to study anisotropy texture in tomographic brain scans to diagnose and quantify the severity of Alzheimer's disease. A full methodology to study computer tomography, magnetic resonance imaging and multispectral magnetic resonance imaging is presented in this thesis. Before applying any texture method to the tomographic brain image

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Pandit, Yadav. "AZIMUTHAL ANISOTROPY IN HEAVY ION COLLISIONS." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1353871180.

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32

Chilton, Nicholas Frederick. "Magnetic anisotropy of transition metal complexes." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/magnetic-anisotropy-of-transition-metal-complexes(64b34057-8a7a-44db-a89a-22a233fdefb5).html.

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The study of magnetic anisotropy in molecular systems permeates the physical sciences and finds application in areas as diverse as biomedical imaging and quantum information processing. The ability to understand and subsequently to design improved agents requires a detailed knowledge of their fundamental operation. This work outlines the background theory of the electronic structure of magnetic molecules and provides examples, for elements across the Periodic Table, of how it may be employed to aid in the understanding of magnetically anisotropic molecules. The magnetic anisotropies of a serie

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Rafique, Sadia. "Magnetic Anisotropy of Fe1-xGax Alloys." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/133.

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Thesis (M.S.) -- University of Maryland, College Park, 2003.<br>Thesis research directed by: Dept. of Materials Science and Nuclear Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Maranville, Brian Benjamin. "Structure and anisotropy in codeposited CoPt₃ /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3112846.

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35

Maddock, Jamie Stewart. "Seismic anisotropy in siliciclastic reservoir rocks." Thesis, University of Leeds, 2006. http://etheses.whiterose.ac.uk/299/.

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The interpretation of geophysical field measurements of seismic anisotropy is presently limited by our knowledge of the controls of the elastic anisotropy of sedimentary rocks in the subsurface. Traditionally, laboratory ultrasonic velocity measurements have been used to provide important information on bulk aggregate seismic anisotropy, however, they do not allow the discrimination of the contribution from the various microstructural parameters (e. g., crystallographic lattice preferred orientation (LPO), preferentially aligned porosity, aligned fractures and the non-random spatial distributi

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Bicalho, Elton da Silva [UNESP]. "Estrutura de variabilidade espacial e temporal da emissão de CO2 e atributos do solo caracterizada por dimensão fractal em área de cana-de-açúcar." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/96815.

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Made available in DSpace on 2014-06-11T19:28:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-28Bitstream added on 2014-06-13T19:16:24Z : No. of bitstreams: 1 bicalho_es_me_jabo.pdf: 503292 bytes, checksum: d2ce2166bc9f68e6b65aa37ca5a4615c (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A emissão de CO2 do solo (FCO2) é influenciada por processos físicos, químicos e biológicos que afetam a produção de CO2 no interior do solo e o seu transporte para a atmosfera, variando no temp

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Rubert, José Benaque. "Grandes deformações e anisotropia por tensores de mapeamento aplicados a problemas de materiais compostos e na conformação de metais." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-21032018-092739/.

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Este trabalho tem por objetivo demonstrar a viabilidade do emprego da teoria de interação de substâncias no contínuo para a análise de compostos multifásicos, sendo possível considerar-se substâncias anisótropas através de sua representação via uma formulação isótropa equivalente. No campo teórico, referente à anisotropia via formulação isótropa equivalente, deduzem-se tensores de mapeamento de tensões e deformações para o espaço fictício na configuração deformada, adequados às análises com grandes deformações. Os modelos de materiais compostos e de anisotropia propostos, foram implementados n

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Alves, Jozismar Rodrigues. "Difusão rotacional em membrana e anisotropia de fluorescência." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-27032013-121603/.

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Propriedades estruturais de membranas modelo, tais como as vesículas lipídicas, podem ser investigadas através da adição de sondas fluorescentes. Após sua incorporação aos sistemas biomoleculares, as moléculas fluorescentes são excitadas por luz linearmente polarizada e a emissão de fluorescência é despolarizada, devido à difusão translacional e também à difusão rotacional do fluoróforo, durante o tempo de vida do estado excitado. O monitoramento da luz emitida é feito através da técnica de fluorescência resolvida no tempo, em que são acompanhadas, por um lado, a intensidade da luz emitida, qu

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Simas, Emanuelle Reis. "Fotoquímica de polímeros conjugados contendo centros de transferência de carga e migração de energia." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-24032011-093724/.

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Neste trabalho foram estudados os processos de migração e transferência de energia em derivados de polifluoreno, de estrutura totalmente conjugada e de conjugação confinada. A dinâmica de estado excitado dos derivados PF-BNI, PFOPPV e PFPPV foi estudada em solução diluída de diferentes solventes através de espectroscopia eletrônica de alta resolução temporal. O derivado PF-BNI, contendo N-(2-benzotiazol)-1,8-naftalimida (BNI) como terminador da cadeia de poli(9,9\'dioctilfluoreno), foi sintetizado pela rota de Yamamoto. O material apresenta alto rendimento quântico de fluorescência e suas prop

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Martins, Alessandro. "Desenvolvimento do processo de produção e estudo estrutural e magnético de filmes finos ordenados de FePt." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24022014-153235/.

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Filmes de ligas FePt com uma estrutura quimicamente ordenada Tetragonal de Face Centrada FCT (tipo L1 IND.0) e textura [001] apresentam anisotropia magnética perpendicular, alta coercividade e grande efeito Kerr polar magnetoóptico. Entretanto, filmes completamente ordenados são normalmente obtidos através de um processo de \"sputtering\" com deposições em altas temperaturas do substrato(T IND. S > OU =600 ºC) ou por pós-tratamento térmico em temperaturas maiores que 500 ºC. As pesquisas atualmente em desenvolvimento visam a obtenção dessa estrutura ordenada a temperaturas mais baixas, o que s

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Stiller, Markus, Jose Barzola-Quiquia, Pablo Esquinazi, et al. "Strong out-of-plane magnetic anisotropy in ion irradiated anatase TiO2 thin films." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-216180.

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The temperature and field dependence of the magnetization of epitaxial, undoped anatase TiO2 thin films on SrTiO3 substrates was investigated. Low-energy ion irradiation was used to modify the surface of the films within a few nanometers, yet with high enough energy to produce oxygen and titanium vacancies. The as-prepared thin film shows ferromagnetism which increases after irradiation with low-energy ions. An optimal and clear magnetic anisotropy was observed after the first irradiation, opposite to the expected form anisotropy. Taking into account the experimental parameters, titanium vacan

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42

Merabtine, Skander. "Etude expérimentale de la multifissuration et de la décohésion de films minces et nanostructures magnétiques sur substrats flexibles : effet sur l'anisotropie magnétique." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD058/document.

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Les systèmes magnétiques flexibles et étirables sont d’intérêt croissant pour le développement de dispositifs électromagnétiques conformables aux surfaces non planes. Dans ce contexte, l’objectif de cette thèse est d’identifier des relations entre phénomènes mécaniques irréversibles (fissuration et délamination) aux grandes déformations et propriétés magnétiques de films minces d’épaisseurs nanométriques (alliages de CoFeB et NiFe) élaborés sur substrat polymère (Kapton®) par pulvérisation magnétron. Dans un premier temps, des essais de traction couplés in situ à la microscopie à forces atomiq

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Geslain, Alan. "Anisotropie naturelle et induite des matériaux poreux : étude expérimentale et modélisation." Phd thesis, Université du Maine, 2011. http://tel.archives-ouvertes.fr/tel-00718301.

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Ce travail de thèse a pour objectif de caractériser le comportement anisotrope des mousses acoustiques. Ces matériaux, couramment employés pour lutter contre les nuisances sonores et vibratoireset sont modélisés à l'aide du modèle de Biot. Celui-ci est basé sur le formalisme de lamécanique des milieux continus à deux champs couplés, l'un associé au solide et l'autre au fluidesaturant. Nous nous intéresserons plus particulièrement dans ce travail aux paramètres du solideet aux matériaux présentant une anisotropie (c'est-à-dire des propriétés qui varient suivant lesdirections) du squelette solid

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Riedel, Marko. "Efficient computation of seismic traveltimes in anisotropic media and the application in pre-stack depth migration." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-204044.

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This study is concerned with the computation of seismic first-arrival traveltimes in anisotropic media using finite difference eikonal methods. For this purpose, different numerical schemes that directly solve the eikonal equation are implemented and assessed numerically. Subsequently, they are used for pre-stack depth migration on synthetic and field data. The thesis starts with a detailed examination of different finite difference methods that have gained popularity in scientific literature for computing seismic traveltimes in isotropic media. The most appropriate for an extension towards an

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Plunkett, Brian W. "Plastic anisotropy of hexagonal closed packed metals." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0012500.

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Modén, Carl S. "Transverse anisotropy in softwoods : Modelling and experiments." Licentiate thesis, KTH, Aeronautical and Vehicle Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3988.

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<p>Transverse anisotropy is an important phenomenon of practical and scientific interest. Although the presence of ray tissue explains the high radial modulus in many hardwoods, experimental data in the literature shows that this is not the case for pine. It is possible that anisotropy in softwoods may be explained by the cellular structure and associated deformation mechanisms.</p><p>An experimental approach was developed by which local radial modulus in spruce was determined at sub-annual ring scale. Digital speckle photography (DSP) was used, and the density distribution was carefully chara

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Zhang, Hongbin. "Relativistic Density Functional Treatment of Magnetic Anisotropy." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25132.

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Spin-orbit coupling (SOC) reduces the spatial symmetry of ferromagnetic solids. That is, the physical properties of ferromagnetic materials are anisotropic, depending on the magnetization direction. In this thesis, by means of numerical calculations with full-relativistic density functional theory, we studied two kinds of physical properties: surface magnetic anisotropy energy (MAE) and anisotropic thermoelectric power due to Lifshitz transitions. After a short introduction to the full-relativistic density functional theory in Chapter 2, the MAE of ferromagnetic thin films is studied in Chapte

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Durrell, John H. "Critical current anisotropy in high temperature superconductors." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/34606.

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After nearly 15 years of research effort, High Temperature Superconductors (HTS) are finding a wide range of practical applications. A clear understanding of the factors controlling the current carrying capacity of these materials is a prerequisite to their successful technological development. The critical current density (Jc) in HTS is directly dependent on the structure and pinning of the Flux Line Lattice (FLL) in these materials. This thesis presents an investigation of the Jc anisotropy in HTS. The use of thin films grown on off c-axis (vicinal) substrates allowed the effect of current d

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Kontogeorgos, Andreas. "Optomechanical anisotropy in nanoengineered polymer photonic crystals." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245235.

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Symmetry in photonic crystals is reflected in the structure of their photonic bands and symmetry breaking can result in the development of complete photonic band gaps, leading to enhanced optical properties. This can be difficult for self-assembled nanostructures, due to their restriction by fundamental principles to preferential geometries, but can be achieved through the application of external stimuli. In order to explore such an approach, elastomeric, nanoengineered, polymer photonic crystal structures have been fabricated on a large scale, through a method of shear induced self-assembly o

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Modén, Carl. "Transverse anisotropy in softwoods : modelling and experiments /." Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3988.

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