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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.

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Showing 1 to 6 of 6 (0.101 seconds)

Spelling suggestions: "subject:"singular colutions"" "subject:"singular 3solutions""

1

Existence of solutions of quasilinear elliptic equations on manifolds with conic points

Nguyen, Thi Thu Huong 13 December 2013 (has links)
No description available.
510
Singular solutions
Quasilinear elliptic equations
Manifolds with conic points
Topological methods
Conic p-Laplacian
Mathematics (PPN61756535X)
2

Development of a nonlinear equations solver with superlinear convergence at regular singularities

Alabdallah, Suleiman 10 October 2014 (has links)
In dieser Arbeit präsentieren wir eine neue Art von Newton-Verfahren mit Liniensuche, basierend auf Interpolation im Bildbereich nach Wedin et al. [LW84]. Von dem resultierenden stabilisierten Newton-Algorithmus wird theoretisch und praktisch gezeigt, dass er effizient ist im Falle von nichtsingulären Lösungen. Darüber hinaus wird beobachtet, dass er eine superlineare Rate von Konvergenz bei einfachen Singularitäten erhält. Hingegen ist vom Newton-Verfahren ohne Liniensuche bekannt, dass es nur linear von fast allen Punkten in der Nähe einer singulären Lösung konvergiert. In Hinsicht auf Anwendungen auf Komplementaritätsprobleme betrachten wir auch Systeme, deren Jacobimatrix nicht differenzierbar sondern nur semismooth ist. Auch hier erreicht unser stabilisiertes und beschleunigtes Newton- Verfahren Superlinearität bei einfachen Singularitäten. / In this thesis we present a new type of line-search for Newton’s method, based on range space interpolation as suggested by Wedin et al. [LW84]. The resulting stabilized Newton algorithm is theoretically and practically shown to be efficient in the case of nonsingular roots. Moreover it is observed that it maintains a superlinear rate of convergence at simple singularities. Whereas Newton’s method without line-search is known to converge only linearly from almost all points near the singular root. In view of applications to complementarity problems we also consider systems, whose Jacobian is not differentiable but only semismooth. Again, our stabilized and accelerated Newton’s method achieves superlinearity at simple singularities.
Optimierung
Newton-Verfahren
Nichtlineare Gleichungen
Singulären Lösung
superlineare Konvergenz
Linensuche
Komplementarität Probleme
Interpolation.
Optimization
Newton’s method
Nonlinear Equations
Singular Solutions
Superlinear Convergence
Line-search
complementarity problems
Interpolation.
510 Mathematik
27 Mathematik
SK 920
ddc:510
3

Existência e simetrias para uma equação elíptica não-linear com potencial monopolar e anisotrópico

Amorim, Charles Braga 27 February 2015 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This master thesis is concerned to nonlinear elliptic problem with mono-polar anisotropic potential u + u|u|p−1 + v (x)u + f(x) = 0 in Rn u(x) - 0, as |x| - 00 provided n > 3 and p > n n−2 . These results, between others things, deals with sub-critical, critical and super-critical nonlinearity. We obtain well-posedness of solutions, regularity in c2(Rn), symmetries and asymptotic behavior of solutions in singular spaces Hk. We employ Banach fixed technique and a theorem of regularity elliptic to get those results, this technique does not need of the Hardy type inequalities and variational methods. / Nesta dissertação estudamos o problema elíptico u + u|u|p−1 + v (x)u + f(x) = 0 em Rn u(x) - 0, quando |x| - 00 sujeito a restrições n > 3 e p > n n−2 , cobrindo os casos sub-críticos, críticos e super-críticos. Obtemos boa-colocação de soluções, regularidade, simetrias de soluções e comportamento assintótico em espaços singulares Hk. Empregamos um argumento de ponto fixo em Hk e Ek ao invés de usar desigualdades do tipo Hardy e métodos variacionais.
Matemática
Equações diferenciais elípticas
Simetria (Matemática)
Anisotropia
Equação elíptica
Potencial de Hardy
Solução singular
Regularidade
Nonlinear elliptic equation
Hardy potentials
Singular solutions
Regularity of solutions
Symmetry of solutions
CIENCIAS EXATAS E DA TERRA::MATEMATICA
4

Dopustiva singularna rešenja sistema gasne dinamike sa nepozitivnim pritiskom / Admissible singular solutions to gas dynamics systems with non-positive pressure

Ružičić Sanja 23 June 2020 (has links)
<p>Karakteristika hiperboličnih sistema zakona odrržanja je da čak i u slučaju glatkog po-četnog uslova re&scaron;enja uglavnom razvijaju prekide u konačnom vremena. Zbog toga se posmatraju slaba re&scaron;enja koja dati sistem zadovoljavaju u distributivnom smislu i mogu biti čak i neograničena &scaron;to se ispoljava kroz pojavu Dirakove delta funkcije u re&scaron;enju. U ovoj disertaciji se akcenat stavlja na analizu protoka sti&scaron;ljivog neviskoznog fluida koji ne menja pravac prilikom kretanja. Protok je opisan Ojlerovim sistemom iz gasne dinamike koji se sastoji iz zakona održanja mase, količine kretanja i energije, dok su karakteristike fluida određene konstitutivnim relacijama. U slučaju izentropskog ili izotermnog protoka sistem se svodi na zakone održanja mase i količine kretanja. Glatka re&scaron;enja takvog sistema automatski zadovoljavaju zakon održanja energije, dok prelaskom na slabu formulaciju dolazi do gubitka energije. Za predstavnike sistema gasne dinamike sa nepozitivnim pritiskom su uzeti sistem gasne dinamike bez pritiska i model za&nbsp; Čapliginov gas i njegova uop&scaron;tenja. Data su re&scaron;enja Rimanovih problema za te sisteme koja se mogu predstaviti kao kombinacija klasičnih elementarnih talasa i senka talasa koji aproksimiraju re&scaron;enja u obliku delta udarnih talasa i koji omogućavaju re&scaron;avanje početnog problema koji u početnom uslovu sadrži delta funkciju. Na primeru modela za uop&scaron;ten Čapliginov gas dokazano je da uslov prekompresivnosti nije jači od entropijskog uslova, &scaron;to je prvi takav rezultat u literaturi. Dalje su kori&scaron;ćena re&scaron;enja Rimanovih problema, kao i problema singularne interakcije i dat je algoritam za konstrukciju globalnog dopustivog približnog re&scaron;enja početnog problema za sistem gasne dinamike bez pritiska. Algoritam je univerzalan i ideja se može pro&scaron;iriti na veliki broj sistema zakona održanja i veliki broj početnih uslova. Diskutovane su promene energije u približnom re&scaron;enju i posle interakcija. Dobijeno približno re&scaron;enje slabo konvergira u prostoru Radonovih mera sa predznakom.</p> / <p>&nbsp;</p><p class="MsoNormal">A solutions to hyperbolic conservation laws systems starting out as smooth often develop singularities in a finite time. As a consequence, we are forced to look for weak solutions that satisfy the system in distributional sense. Those solutions are often unbounded, which is expressed through the appearance of Dirac delta function. In this theses we study a one-dimensional, compressible and inviscid flow of a fluid. The process is described by compressible Euler gas dynamics system which consists of conservation laws of mass, linear momentum and energy, while the characteristics of the fluid are described using constitutive relations. In the case of isentropic or isothermal flow the system reduces to conservation laws of mass and linear momentum. The energy is conserved for smooth solutions to such systems, but while passing to the weak formulation the energy is being dissipated. As representatives, we&nbsp; consider pressureless gas dynamics system, as well as Chaplygin gas model and its generalizations. We give the solutions to Riemann problems which can be represented as a combinations of classical elementary waves and shadow waves that approximate the solutions in the form of delta shock and allow as to solve the problems with initial data containing delta function. We use generalized Chaplygin gas model as demonstration of the fact that overcompressibility condition is not stronger that entropy condition, which is the first result of that kind in the literature. Further, we use solutions&nbsp; to the Riemann problems, as well as singular interaction problems to give the algorithm for construction of global admissible approximate solution to the pressureless gas dynamics initial value problem. The algorithm is universal and idea can be applied to large number of conservation laws systems and large number of initial data. We discuss&nbsp; energy changes in approximate solution and after the interactions. 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5

Sobre singularidades analíticas de soluções de uma classe de campos vetoriais no Toro / On analytic singularities of a class of vector fields on the torus

Leonardo Avila 11 August 2009 (has links)
O objetivo principal deste trabalho é o estudo da regularidade anallítica global de certos operadores diferenciais definidos no toro. Uma ferramenta fundamental utilizada neste estudo são as séries parciais de Fourier, que nos permitem caracterizar tanto as distribuições periódicas quanto as funções anallíticas reais periódicas através do comportamento assintótico de seus coeficientes parciais de Fourier. Neste sentido, apresentamos também um estudo detalhado das relações destes objetos com seus coeficientes parciais de Fourier / The main goal of this work is to study global analytic regularity properties of certain differential operators acting in the torus. A main tool that will be used to achieve our goals are the partial Fourier series, which allow us to characterize objects such as periodic distributions or periodic real analytic functions in terms of the growth of their partial Fourier coefficients
Distribuições periódicas
Funções analíticas reais
Hipoeliticidade analítica global
Operadores diferenciais parciaisno toro
Séries de Fourier
Soluções singulares
Stationary phase method
Steepest descent method
Fourier series
Global analytic
Hipoellitptic
Periodic distributions
Real analytic functions
Singular solutions
Stationary phase method
Steepet descent method
6

Sobre singularidades analíticas de soluções de uma classe de campos vetoriais no Toro / On analytic singularities of a class of vector fields on the torus

Avila, Leonardo 11 August 2009 (has links)
O objetivo principal deste trabalho é o estudo da regularidade anallítica global de certos operadores diferenciais definidos no toro. Uma ferramenta fundamental utilizada neste estudo são as séries parciais de Fourier, que nos permitem caracterizar tanto as distribuições periódicas quanto as funções anallíticas reais periódicas através do comportamento assintótico de seus coeficientes parciais de Fourier. Neste sentido, apresentamos também um estudo detalhado das relações destes objetos com seus coeficientes parciais de Fourier / The main goal of this work is to study global analytic regularity properties of certain differential operators acting in the torus. A main tool that will be used to achieve our goals are the partial Fourier series, which allow us to characterize objects such as periodic distributions or periodic real analytic functions in terms of the growth of their partial Fourier coefficients
Distribuições periódicas
Fourier series
Funções analíticas reais
Global analytic
Hipoeliticidade analítica global
Hipoellitptic
Operadores diferenciais parciaisno toro
Periodic distributions
Real analytic functions
Séries de Fourier
Singular solutions
Soluções singulares
Stationary phase method
Stationary phase method
Steepest descent method
Steepet descent method

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