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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
771

Static and dynamic critical phenomena in ultrathin films of iron on W(110) /

Dunlavy, Michael. Venus, David, January 1900 (has links)
Thesis (Ph.D.)--McMaster University, 2004. / Advisor: David Venus. Includes bibliographical references (leaves 138-144). Also available via World Wide Web.
772

Entanglement, dynamical bifurcations and quantum phase transitions /

Hines, Andrew Peter. January 2005 (has links) (PDF)
Thesis (Ph.D) - University of Queensland, 2006. / Includes bibliography.
773

Tilt phase transitions in disordered systems /

Chen, Leiming. January 2006 (has links)
Thesis (Ph. D.)--University of Oregon, 2006. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 126-128). Also available for download via the World Wide Web; free to University of Oregon users.
774

Modélisation des cinétiques de réactions multiples dans les alliages métalliques. Etude de la microségrégation lors de la solidification dendritique, péritectique et eutectique d'alliages aluminium-nickel.

Tourret, Damien 11 December 2009 (has links) (PDF)
Les poudres d'alliages aluminium-nickel produites par atomisation peuvent être traitées pour préparer du nickel de Raney, un catalyseur utilisé dans de nombreux procédés industriels. L'activité du catalyseur dépend fortement du déroulement des multiples réactions de solidification pendant l'atomisation. Un modèle de microségrégation pour la solidification d'alliages métalliques est alors développé. En considérant des flux de diffusion finis, des cinétiques de réactions dendritique, péritectique et eutectique et des surfusions de germination, une alternative plus évoluée est proposée aux modèles de Gulliver-Scheil ou de la loi des leviers. Le couplage avec des calculs d'équilibre thermodynamique est effectué pour évaluer les compositions des interfaces et les termes d'enthalpie dans le bilan d'énergie. Le modèle est appliqué à un alliage binaire, avec des densités de phases constantes, pour simuler le procédé d'atomisation de gouttes d'alliage Al-Ni. Un modèle dédié est choisi pour les conditions aux limites d'échange de chaleur. Les résultats sont comparés à des mesures expérimentales obtenues par diffraction de neutron. Des interprétations sont alors établies sur les comportements non triviaux des alliages Al-Ni solidifiés rapidement. Le modèle proposé permet ainsi d'appréhender les effets concurrents des différentes cinétiques (diffusion chimique, bilan d'énergie, vitesse croissance des microstructures, etc.) lors de la solidification hors équilibre. Les principaux développements envisageables autour de ce travail incluent : l'extension aux alliages multicomposés, l'inclusion de densités variables, le couplage avec des calculs macroscopiques.
775

Migration élastique quantitative : applications à la sismique de puits 3D /

Clochard, Vincent. January 1900 (has links)
Th. univ.--Géophys. interne--Paris 7, 1998. / Bibliogr. p. 236-241. Résumé en français et en anglais. 1999 d'après la déclaration de dépôt légal.
776

Recalage rigide, non rigide et projectif d'images médicales tridimensionnelles /

Feldmar, Jacques. January 1900 (has links)
Th. doct.--Informatique--Palaiseau--Éc. polytech., 1995. / Bibliogr. p. 179-190. Résumé en français et en anglais. 1997 d'après la déclaration de dépôt légal.
777

Um estudo sobre transições de fase dinâamicas e equações estocásticas de Ginzburg-Landau-Langevin

Seewald, Nadiane Cristina Cassol [UNESP] 31 March 2006 (has links) (PDF)
Made available in DSpace on 2016-05-17T16:50:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-03-31. Added 1 bitstream(s) on 2016-05-17T16:54:27Z : No. of bitstreams: 1 000855335.pdf: 1074217 bytes, checksum: 35ef7310807b6ea93f1d212ad06d380a (MD5)
778

Construcao e caracterizacao in vitro de um vetor retroviral bicistronico codificando endostatina e interleucina-2 para utilizacao em terapia genica / Construction and characterization in vitro of a bicistronic retroviral vector coding endostatin and interleukin-2 for use in gene therapy

CALVO, FERNANDA B. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:27:15Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:04Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
779

Aspectos da deformacao do aluminio em ensaios de tracao

QUADROS, NEY F. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:31:55Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:40Z (GMT). No. of bitstreams: 1 02238.pdf: 7874589 bytes, checksum: 2508ea5b8a12f7656ab705c285fb99b3 (MD5) / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
780

Estudando matrizes a partir de transformações geométricas

Stormowski, Vandoir January 2008 (has links)
Este trabalho tem como objetivo central a elaboração, implementação e reflexão sobre uma sequência didática para o estudo de matrizes a partir de tranformações geométricas. A sequência didática pretende propiciar ao aluno um estudo que justifique as definições das operações entre matrizes e suas respectivas propriedades, a partir da observação e análise de algumas transformações geométricas, de modo a se refazer o processo histórico da definição e obtenção desses conceitos. Além disso apresenta algumas atividades de aplicação de matrizes, onde a composição e iteração de transformações geométricas no software Shapari geram algumas figuras fractais. Como metodologia de trabalho adotamos a engenharia didática para a elaboração, implementação e avaliação da didática proposta. O texto também apresenta a análise das referências sobre o ensino de matrizes e tranformações geométricas. Começando pelas orientações dos documentos oficiais e passando pela apresentação de diversos estudos sobre o tema delimitamos e justificamos a nossa proposta de ensino. Além disso, apresentamos um extrato sobre o conhecimento matemático envolvido no tema, de modo que sirva de base para o docente que implementar a seuência didática em sala de aula. / This work has as its main goal the formulation, implementation and contemplation of a didactie sequence to the study of matrices from geometric transformations. The didactic sequence intends to propitiate the student a study which justifies the definitions of operations between matrices and their respective properties, from the observation and analysis of some geometrie transformations, so that they are able to redo the historical process of the definition and the acquisition of these concepts. Besides that, it shows some activities to the application of matrices, in which the composition and interation of geometric transformations in the Shapari software generate some fractals. We have adopted Didactic Engineering as a methodology to the elaboration, implementation and evaluation of the proposed didactic sequence. The text also shows an analysis of the references about the teaching of matrices and the geometric transformations. We delimited and justified our teaching proposal by staring with orientations of official documents and showing a series of studies about the theme. Besides that, we show an excerpt about the mathematical knowledge involved in the theme, so that, it can be used as basis to the teacher who decides to implement the didactic sequence in the classroom.

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