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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.
21

İdeal cauchy dizileri /

Yaman, Zeynep Hande. Pehlivan, Serpil. January 2008 (has links) (PDF)
Tez (Yüksek Lisans) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Matematik Anabilim Dalı, 2008. / Kaynakça var.
22

The theory of integrated empathies

Brown, Thomas John. January 2005 (has links)
Thesis (PhD.(Mathematics))-University of Pretoria, 2005. / Includes bibliographical references. Available on the Internet via the World Wide Web.
23

Strong traces for degenerate parabolic-hyperbolic equations and applications

Kwon, Young Sam. January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.
24

On the Cauchy problem for a class of degenerate hyperbolic equations

Krüger, Matthias 18 May 2018 (has links)
No description available.
25

O problema de Cauchy para sistemas quase-lineares hiperbólicos é bem posto em espaços de Hölder

Silva, Rômel da Rosa da 10 August 2012 (has links)
Made available in DSpace on 2016-06-02T20:27:40Z (GMT). No. of bitstreams: 1 4444.pdf: 689745 bytes, checksum: 511f734e8913b3b1285fcda6fb0c67e3 (MD5) Previous issue date: 2012-08-10 / Financiadora de Estudos e Projetos / We consider the Cauchy problem for the quasi-linear systems that is, the system is hyperbolic at u = 0. We show that certain Besov spaces are preserved by flow of the solution, near the null solution. / Nós consideramos o problema de Cauchy para sistemas quase-lineares, ou seja o sistema é hiperbólico em u = 0. Demonstramos que certos espaços de Besov são preservados pelo fluxo da solução, perto da solução nula.
26

Existência de atrator global para uma equação de evolução com convolução. / Existence of global attractor for an evolving equation with convolution.

CÂMARA, Rodrigo Toledo Teixeira. 27 July 2018 (has links)
Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-07-27T16:36:24Z No. of bitstreams: 1 RODRIGO TOLEDO TEIXEIRA CÂMARA - DISSERTAÇÃO PPGMAT 2011..pdf: 613119 bytes, checksum: 87759133ae4ab596c12042ee64e93dff (MD5) / Made available in DSpace on 2018-07-27T16:36:24Z (GMT). No. of bitstreams: 1 RODRIGO TOLEDO TEIXEIRA CÂMARA - DISSERTAÇÃO PPGMAT 2011..pdf: 613119 bytes, checksum: 87759133ae4ab596c12042ee64e93dff (MD5) Previous issue date: 2011-11 / CNPq / Neste trabalho consideramos uma equação de evolução não local com convolução e provamos a existência de um atrator global para o fluxo gerado por esta equação. Além disso, mostramos que o funcional energia associado a esta equação satisfaz a propriedade de Lyapunov de decrescer ao longo de soluções. Mostramos também a existência de equilíbrios não triviais e estudamos a instabilidade destes equilíbrios. / In this work, we consider a non local evolution equation with convolution and we prove the existence of a global attractor for the flow generated by that equation. Futhermore, we show that the energy functional associated with this equation satisfies the Lyapunov’s property of decreasing under the solutions. We also show the existence of non trivial equilibria and study its instability
27

O problema de Cauchy para um sistema de equações do tipo Schrodinger não linear de terceira ordem / The Cauchy problem associated to a system of coupled third-order nonlinear Schrodinger equation

Bragança, Luciana Maria Mendonça 06 May 2007 (has links)
Orientadores: Marcia Assumpção Guimarães Scialom, Felipe Linares / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-10T05:23:45Z (GMT). No. of bitstreams: 1 Braganca_LucianaMariaMendonca_D.pdf: 688598 bytes, checksum: af92575e77efea7c1bdd4a624c7d70dc (MD5) Previous issue date: 2007 / Resumo: Neste trabalho estudamos o problema de Cauchy associado a um sistema de Equações do tipo Schrodinger não linear de terceira ordem. Obtemos resultados de boa colocação local para o problema, com dado inicial nos espaços de Sobolev Hs(R) x Hs(R), s '> ou =' 1/4 e no caso períodico em Hs(T)xHs(T), s '> ou =' 1/2. No caso particular'sigma' 'alfa' = 'sigma' 'beta' = 'sigma''mu' = 1 obtemos resultados de boa colocação global em Hs(R) x Hs(R), 3/5 < s '> ou = 1 e H1(T) x H1(T). Mostramos também um resultado de má colocação para o problema com dado inicial em Hs(R) x Hs(R), -1/2 < s < 1/4 / Abstract: In this work we study the Cauchy problem associated to a system of coupled third-order nonlinear Schrodinger equation. We establish local well-posedness results for the problem with data in Sobolev spaces Hs(R) x Hs(R), s '> or =' 1/4 and in the periodic case Hs(T)xHs(T), s '> or =' 1/2. In the particular case ... Note: The complete abstract is available with the full electronic digital thesis or dissertations / Doutorado / Doutor em Matemática
28

Sequências monótonas aplicadas a um problema de cauchy para um sistema de reação-difusão-convecção / Monotone sequences applied to a cauchy problem for a reaction-diffusion-convection system

Barros, Carlos Eduardo Rosado de 07 August 2015 (has links)
Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2016-05-05T20:25:53Z No. of bitstreams: 2 Dissertação - Carlos Eduardo Rosado de Barros - 2015.pdf: 1334566 bytes, checksum: 373183ed73dd83bfac5d91d2670c2e36 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-05-06T11:43:27Z (GMT) No. of bitstreams: 2 Dissertação - Carlos Eduardo Rosado de Barros - 2015.pdf: 1334566 bytes, checksum: 373183ed73dd83bfac5d91d2670c2e36 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Made available in DSpace on 2016-05-06T11:43:27Z (GMT). No. of bitstreams: 2 Dissertação - Carlos Eduardo Rosado de Barros - 2015.pdf: 1334566 bytes, checksum: 373183ed73dd83bfac5d91d2670c2e36 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) Previous issue date: 2015-08-07 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / In this work, mainly based on the articles, [1], [2] and [7], one studies a reactiondiffusion- convection system, related the propagation of a combustion front through a porous medium, giving origin a Cauchy problem. Such a problem has been approached by the methode of the monotone iterations, which leads to an unique time-global solution. / Nesse trabalho, baseado principalmente nos artigos [1], [2] e [7], estuda-se um sistema reação-difusão-convecção, relacionado à propagação de uma frente de combustão em um meio poroso, recaindo sobre um problema de Cauchy. Tal problema é abordado através do método de iterações monótonas, o qual conduz a uma única solução global no tempo.
29

On some classes of multipliers and semigroups in the spaces of ultradistributions and hyperfunctions / O nekim klasama multiplikatora i semigrupana prostorima ultradistribucija i hiperfunkcija

Velinov Daniel 18 October 2014 (has links)
<p>We are study the spaces of convolutors and multipliers in the spaces of<br />tempered ultradistributions. There given theorems which gives us the characteri-zation of all the elements which belongs to spaces of convolutors and multipliers.<br />Structural theorem for ultradistribution semigroups and exponential ultradistri-bution semigroups is given. Fourier hyperfunction semigroups and hyperfunction<br />semigroups with non-densely dened generators are analyzed and also structural<br />theorems and spectral characterizations give necessary and sucient conditions<br />for the existence of such semigroups generated by a closed not necessarily densely<br />dened operator A. The abstract Cauchy problem is considered in the Banach<br />valued weighted Beurling ultradistribution setting and given some applications on<br />particular equations.</p> / <p>U disertaciji se proučavaju prostor konvolutora i multiplikatora na prostorima temperiranih ultradistribucija. Dokazane su&nbsp;teoreme koji karakteri&scaron;u elemente prostora konvolutora i multiplikatora. Date su strukturne teoreme za ultradistribucione &nbsp;polugrupe&nbsp;i eksponenecijalne polugrupe. Furijeve huperfunkciske polugrupe i&nbsp;hiperfunkciske polugrupe sa generatorima koji su negusto definisani&nbsp;<br />su analizirani, takođe su date strukturne teoreme i spektralne karakterizacije kao i dovoljni uslovi za postojenje na takvih polugrupa&nbsp;za operator A koji ne mora biti gust. Apstraktni Ko&scaron;ijev problem je&nbsp;proučavan za težinske Banahove prostore kao i za odgovarujuće prostora ultradistribucija. Takođe su date i primene za određene klase<br />jednačina.</p>
30

Inverse problem for stress in the earth based on geodetic data

Ikeda, Keiichiro January 1981 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND LINDGREN. / Includes bibliographies. / by Keiichiro Ikeda. / Ph.D.

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