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Thèses sur le sujet « Symmetry of solution »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Otto, Simon [Verfasser], and Klaus [Akademischer Betreuer] Solbach. "Solution to the Broadside Problem and Symmetry Properties of Periodic Leaky-Wave Antennas / Simon Otto. Betreuer: Klaus Solbach." Duisburg, 2016. http://d-nb.info/1109745710/34.

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2

ABATANGELO, LAURA. "Multiplicity of solutions to elliptic equations the case of singular potentials in second order problems and morse theory in a fourth order problem." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/20336.

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Symmetry properties of solutions to some nonlinear Schroedinger equations are investigated. In particular, here the Laplace operator is perturbed by singular potentials which do not belong to the Kato class. A result of symmetry breaking of solutions is obtained provided a preliminary theorem about biradial solutions is stated. Further, a problem involving the biharmonic operator and exponential nonlinearity in dimension 4 is studied, connecting degree counting formulas with direct methods of calculus of variations via Morse theory and deformation lemmas.

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3

Wang, Qun. "Solutions Périodiques Symétriques dans le Problème de N-Vortex." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLED069/document.

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Cette thèse porte sur l’étude des solutions périodiques du problème des N-tourbillons à vorticité positive. Ce problème, formulé par Helmholtz il y a plus de 160 ans, possède une histoire très riche et reste un domaine de recherche très actif. Pour un nombre quelconque de tourbillons et sans contrainte sur les vorticités, ce système n’est pas intégrable au sens de Liouville : on ne peut trouver de solution périodique non triviale par des méthodes explicites. Dans cette thèse, à l’aide de méthodes variationnelles, nous prouvons l’existence d’une infinité de solutions périodiques non triviales p

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4

Sang, W. M. "A search for the Standard Model Higgs boson using the OPAL detector at LEP." Thesis, Brunel University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340840.

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5

Eschke, Andy. "Analytical solution of a linear, elliptic, inhomogeneous partial differential equation in the context of a special rotationally symmetric problem of linear elasticity." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-149970.

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In addition to previous publications, the paper presents the analytical solution of a special boundary value problem which arises in the context of elasticity theory for an extended constitutive law and a non-conservative symmetric ansatz. Besides deriving the general analytical solution, a specific form for linear boundary conditions is given for user convenience.

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6

Carter-Fenk, Kevin D. "Design and Implementation of Quantum Chemistry Methods for the Condensed Phase: Noncovalent Interactions at the Nanoscale and Excited States in Bulk Solution." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu161617640330551.

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7

Eschke, Andy. "Analytical solution of a linear, elliptic, inhomogeneous partial differential equation with inhomogeneous mixed Dirichlet- and Neumann-type boundary conditions for a special rotationally symmetric problem of linear elasticity." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-149965.

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The analytical solution of a given inhomogeneous boundary value problem of a linear, elliptic, inhomogeneous partial differential equation and a set of inhomogeneous mixed Dirichlet- and Neumann-type boundary conditions is derived in the present paper. In the context of elasticity theory, the problem arises for a non-conservative symmetric ansatz and an extended constitutive law shown earlier. For convenient user application, the scalar function expressed in cylindrical coordinates is primarily obtained for the general case before being expatiated on a special case of linear boundary condition

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8

MIRAGLIO, PIETRO. "ESTIMATES AND RIGIDITY FOR STABLE SOLUTIONS TO SOME NONLINEAR ELLIPTIC PROBLEMS." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/704717.

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Questa tesi è incentrata sullo studio di equazioni differenziali alle derivate parziali di tipo ellittico. La prima parte della tesi riguarda la regolarità delle soluzioni stabili per un'equazione nonlineare con il p-Laplaciano, in un dominio limitato dello spazio Euclideo. La tecnica è basata sull'uso di disuguaglianze di tipo Hardy-Sobolev su ipersuperfici, del quale viene approfondito lo studio. Nella seconda parte viene preso in esame un problema nonlocale di tipo Dirichlet-Neumann. Studiamo la simmetria unidimensionale di alcune sottoclassi di soluzioni stabili, ottenendo risultati in dim

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9

Mehraban, Arash. "Non-Classical Symmetry Solutions to the Fitzhugh Nagumo Equation." Digital Commons @ East Tennessee State University, 2010. https://dc.etsu.edu/etd/1736.

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In Reaction-Diffusion systems, some parameters can influence the behavior of other parameters in that system. Thus reaction diffusion equations are often used to model the behavior of biological phenomena. The Fitzhugh Nagumo partial differential equation is a reaction diffusion equation that arises both in population genetics and in modeling the transmission of action potentials in the nervous system. In this paper we are interested in finding solutions to this equation. Using Lie groups in particular, we would like to find symmetries of the Fitzhugh Nagumo equation that reduce this non-linea

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10

Lau, Tracy. "Numerical solution of skew-symmetric linear systems." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17435.

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We are concerned with iterative solvers for large and sparse skew-symmetric linear systems. First we discuss algorithms for computing incomplete factorizations as a source of preconditioners. This leads to a new Crout variant of Gaussian elimination for skew-symmetric matrices. Details on how to implement the algorithms eﬃciently are provided. A few numerical results are presented for these preconditioners. We also examine a specialized preconditioned minimum residual solver. An explicit derivation is given, detailing the eﬀects of skew-symmetry on the algorithm.

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11

Mesquita, Cláudia Aline Azevedo dos Santos 1984. "Existência e propriedades qualitativas para dois tipos de EDP's com potenciais singulares." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307596.

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Orientador: Lucas Catão de Freitas Ferreira<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica<br>Made available in DSpace on 2018-08-24T06:33:09Z (GMT). No. of bitstreams: 1 Mesquita_ClaudiaAlineAzevedodosSantos_D.pdf: 1141685 bytes, checksum: a65a24d1917c5f998314d01970bb86e3 (MD5) Previous issue date: 2013<br>Resumo: Nesta tese, estudamos dois tipos de EDPs com potenciais singulares críticos, a saber, uma equação elíptica com operador poliharmônico e a equação do calor linear. Para a primeira, pesquisamos existência e propr

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12

Soltan, Omar. "Solution isomerization of commercial C₂-symmetric metallocene catalysts /." Link to the online version, 2006. http://hdl.handle.net/10019/1219.

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13

Soltan, Omar. "Solution isomerization of commercial C2-symmetric metallocene catalysts." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2856.

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Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006.<br>This study concerns the investigation of the isomerization of different metallocene catalysts in solution, and the effects thereof on the microstructure of polypropylenes prepared with these catalysts. Two C2 symmetric ansa metallocenes, ethylene-bis(indenyl) zirconium dichloride (EI) and dimethylsilyl-bis(2-methyl benzoindenyl) zirconium dichloride (MBI) were exposed, in solution, to both sunlight and UV radiation. The rac-meso isomerization of these catalysts were followed by 1H NMR spectroscopy. The re

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14

Hood, Simon. "Nonclassical symmetry reductions and exact solutions of nonlinear partial differential equations." Thesis, University of Exeter, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357042.

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15

KURKA, PAULO ROBERTO GARDEL. "NUMERICAL SOLUTIONS FOR EIGENPROBLEMS ASSOCIATED TO SYMMETRIC OPERATORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1985. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20274@1.

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Desenvolve-se uma técnica para a extração de auto-pares relacionados com a solução de problemas de Elementos Finitos. O algoritmo consiste no uso dos métodos da Iteração Inversa e Gradiente Conjugado para a obtenção do vetor solução associado ao menor auto-valor. As soluções do auto-sistema são calculadas sequencialmente pela modificação da matriz dos coeficientes das equações de equilíbrio do problema através do uso de uma técnica de Deflação. O uso extensivo desta técnica introduz auto-valores múltiplos na matriz dos coeficientes, tornando necessário proceder-se a uma combinação dos dois mét

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16

Perkins, Alun. "Static spherically symmetric solutions in higher derivative gravity." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44072.

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We consider the four-derivative modification to the Einstein-Hilbert action of general relativity, without a cosmological constant. Higher derivative terms are interesting because they make the theory renormalisable (but non-unitary) and because they appear generically in quantum gravity theories. We consider the classical, static, spherically symmetric solutions, and try to enumerate all solution families. We find three families in expansions around the origin: one corresponding to the vacuum, another which contains the Schwarzschild family, and another which does not appear in generic theori

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17

Granström, Frida. "Symmetry methods and some nonlinear differential equations : Background and illustrative examples." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48020.

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Differential equations, in particular the nonlinear ones, are commonly used in formulating most of the fundamental laws of nature as well as many technological problems, among others. This makes the need for methods in finding closed form solutions to such equations all-important. In this thesis we study Lie symmetry methods for some nonlinear ordinary differential equations (ODE). The study focuses on identifying and using the underlying symmetries of the given first order nonlinear ordinary differential equation. An extension of the method to higher order ODE is also discussed. Several illus

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18

Krishnamoorthy, Mohan. "Contributions to the solution of the symmetric travelling salesman problem." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46875.

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19

Hwang, Eugene. "Classification of Isometry Algebras of Solutions of Einstein's Field Equations." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7578.

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Since Schwarzschild found the first solution of the Einstein’s equations, more than 800 solutions were found. Solutions of Einstein’s equations are classified according to their Lie algebras of isometries and their isotropy subalgebras. Solutions were taken from the USU electronic library of solutions of Einstein’s field equations and the classification used Maple code developed at USU. This classification adds to the data contained in the library of solutions and provides additional tools for addressing the equivalence problem for solutions to the Einstein field equations. In this thesis, hom

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20

Mixon, Melody D. "Approximate solutions to the anti-symmetric quadratic spring system." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1992. http://digitalcommons.auctr.edu/dissertations/3525.

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We investigate the construction of analytic approximations to the solutions of the nonlinear anti-symmetric quadratic oscillator. The procedure used is based on the method of generalized harmonic balance as formulated by Mickens. We prove that all solutions to the differential equation are bounded and periodic. This result is based upon the use of a correct definition of the absolute value of a variable and the use of this definition to calculate its derivative.

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21

Waterton, Richard James. "Analysis of the soliton solutions of a 3-level Maxwell-Bloch system with rotational symmetry." Thesis, University of Glasgow, 2004. http://theses.gla.ac.uk/3867/.

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The dynamics of soliton pulses for use in nonlinear optical devices is mathematically modelled by Maxwell-Bloch systems of equations for the interaction of light with a uniform distribution of quantum-mechanical atoms. We study the Reduced Maxwell-Bloch (RMB) equations occurring when an ensemble of rotationally symmetric 3-level atoms is assumed. The model applies for on and off-resonance conditions and is completely integrable using Inverse Scattering theory, since it arises as the compatibility condition of a 3 x 3 AKNS-system. Furthermore this integrability remains valid for all timescales

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22

Alshahrani, Ali Mohammed S. "Tesseract : a 4D symmetric block cipher cryptography solution for real-time applications." Thesis, University of Essex, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701375.

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Security issues are a major concern, especially with real-time applications that are very time- sensitive because of file size. Cryptography is one of the main techniques used to provide the necessary data security. As is well known, the concept of the cryptography is to convert the plaintext into an unreadable version on the sender side by using an encryption key. At the receiver side, the ciphertext is returned into its original situation. Of particular relevance is key space viz. the number of possible keys that can be used to generate the key from the keys container. This is very important

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23

Kurepa, Alexandra. "Radially Symmetric Solutions to a Superlinear Dirichlet Problem in a Ball." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc330725/.

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24

Ames, Ellery. "Singular Symmetric Hyperbolic Systems and Cosmological Solutions to the Einstein Equations." Thesis, University of Oregon, 2014. http://hdl.handle.net/1794/17905.

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Characterizing the long-time behavior of solutions to the Einstein field equations remains an active area of research today. In certain types of coordinates the Einstein equations form a coupled system of quasilinear wave equations. The investigation of the nature and properties of solutions to these equations lies in the field of geometric analysis. We make several contributions to the study of solution dynamics near singularities. While singularities are known to occur quite generally in solutions to the Einstein equations, the singular behavior of solutions is not well-understood. A valuabl

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25

Lopez, Rios Luis Fernando. "Two problems in nonlinear PDEs : existence in supercritical elliptic equations and symmetry for a hypo-elliptic operator." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4701/document.

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Le travail présenté est dédié à des problèmes d'EDP non linéaires. L'idée principale est de construire des solutions régulières á certaines EDPs elliptiques et hypo-elliptiques et étudier leur propriétés qualitatives. Dans une première partie, on considère un problème sur-critique du type $$-Delta u = lambda e^u$$ avec $lambda > 0$ posé dans un domaine extérieur avec conditions de Dirichlet homogènes. Une réduction en dimension finie permet de prouver l'existence d'un nombre infini de solutions régulières quand $lambda$ est assez petit. Dans une deuxième partie, on étudie la concentration d

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26

Shibayama, Mitsuru. "Multiple symmetric periodic solutions to the 2n-body problem with equal masses." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136738.

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27

Fachin, M. P. G. "The divide-and-conquer method for the solution of the symmetric tridiagonal eigenproblem and transputer implementations." Thesis, University of Kent, 1994. https://kar.kent.ac.uk/21194/.

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28

Ferrante, Cristian. "Cosmological and static spherically symmetric solutions to Einstein equations with an exponential scalar potential." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25606/.

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Exponential potentials can be associated both with expanding and collapsing cos- mologies: whereas power-law inflation can be obtained for a nearly flat exponential potential, a stable contracting cosmology (which, by the way, can solve the hori- zon problem) can be obtained for a negative sufficiently steep exponential potential. Motivated by these results, we study the Einstein equation for a scalar field with an exponential potential in a static and spherically symmetric spacetime. For the same parameters which describe a stable contracting cosmology, we find a non- asymptotically flat blac

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29

Nzioki, Anne Marie. "A study of solutions and perturbations of spherically symmetric spacetimes in fourth order gravity." Doctoral thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/4916.

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Includes abstract.<br>Includes bibliographical references.<br>In this thesis we use the 1+1+2 covariant approach to General Relativity to study exact solutions and perturbations of rotationally symmetric spacetimes in f(R) gravity, one of the most widely studied classes of fourth order gravity. We begin by introducing f(R) theories of gravity and present the general equations for these theories. We investigate the problem of matching different regions of spacetime, shedding light on the problem of constructing realistic inhomogeneous cosmologies in the context of f(R) gravity. We also study st

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30

Krämer, Jan Martin [Verfasser], Bernd [Gutachter] Kawohl, and Guido [Gutachter] Sweers. "Regularity and Symmetry Results for Ground State Solutions of Quasilinear Elliptic Equations / Jan Martin Krämer ; Gutachter: Bernd Kawohl, Guido Sweers." Köln : Universitäts- und Stadtbibliothek Köln, 2020. http://d-nb.info/1221718398/34.

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31

Aktas, Metin. "Exact Supersymmetric Solution Of Schrodinger Equation For Some Potentials." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605819/index.pdf.

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Exact solution of the Schr&ouml<br>dinger equation with some potentials is obtained. The normal and supersymmetric cases are considered. Deformed ring-shaped potential is solved in the parabolic and spherical coordinates. By taking appropriate values for the parameter q, similar results are obtained for Hulth&eacute<br>n and exponential type screened potentials. Similarly, Morse, P&ouml<br>schl-Teller and Hulth&eacute<br>n potentials are solved for the supersymmetric case. Supersymmetric solution of PT-/non-PT-symmetric and non-Hermitian Morse potential is also studied. The Nikiforov-Uvarov a

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32

Morrison, George. "Rotationally-symmetric solutions to a nonlinear elliptic system under an incompressibility constraint and related problems." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79856/.

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33

Volkin, Robert P. "Spherical Shell Solutions to the Radially Symmetric Aggregation Equation: Analysis and a Novel Numerical Method." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1575639958498416.

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34

Guerrero, Flores Danny Joel. "On Updating Preconditioners for the Iterative Solution of Linear Systems." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/104923.

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El tema principal de esta tesis es el desarrollo de técnicas de actualización de precondicionadores para resolver sistemas lineales de gran tamaño y dispersos Ax=b mediante el uso de métodos iterativos de Krylov. Se consideran dos tipos interesantes de problemas. En el primero se estudia la solución iterativa de sistemas lineales no singulares y antisimétricos, donde la matriz de coeficientes A tiene parte antisimétrica de rango bajo o puede aproximarse bien con una matriz antisimétrica de rango bajo. Sistemas como este surgen de la discretización de PDEs con ciertas condiciones de frontera de

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35

Tian, Rushun. "Existence and Multiplicity Results on Standing Wave Solutions of Some Coupled Nonlinear Schrodinger Equations." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1484.

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Coupled nonlinear Schrodinger equations (CNLS) govern many physical phenomena, such as nonlinear optics and Bose-Einstein condensates. For their wide applications, many studies have been carried out by physicists, mathematicians and engineers from different respects. In this dissertation, we focused on standing wave solutions, which are of particular interests for their relatively simple form and the important roles they play in studying other wave solutions. We studied the multiplicity of this type of solutions of CNLS via variational methods and bifurcation methods. Variational methods are u

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36

Macias, Diaz Jorge. "A Numerical Method for Computing Radially Symmetric Solutions of a Dissipative Nonlinear Modified Klein-Gordon Equation." ScholarWorks@UNO, 2004. http://scholarworks.uno.edu/td/167.

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In this paper we develop a finite-difference scheme to approximate radially symmetric solutions of a dissipative nonlinear modified Klein-Gordon equation in an open sphere around the origin, with constant internal and external damping coefficients and nonlinear term of the form G' (w) = w ^p, with p an odd number greater than 1. We prove that our scheme is consistent of quadratic order, and provide a necessary condition for it to be stable order n. Part of our study will be devoted to study the effects of internal and external damping.

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Bardiaux, Benjamin [Verfasser]. "Structure calculation of proteins from solution and solid-state NMR data : Application to monomers and symmetric aggregates / Benjamin Bardiaux." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1023748983/34.

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38

Faridfathi, Gholamreza. "Exact Supersymmteric Solutions Of The Quantum Mechanics." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606276/index.pdf.

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The supersymmetric solutions of PT-/non-PT symmetric and Hermitian/non-Hermitian forms of quantum systems are obtained by solving the Schr&Auml<br>odinger equation with the deformed Morse, Hulth&para<br>en, P&Auml<br>oschl-Teller, Hyperbolic Kratzer-like, Screened Coulomb, and Exponential-Cosine Screened Coulomb (ECSC) potentials. The Hamiltonian hi- erarchy method is used to get the real energy eigenvalues and corresponding wave functions.

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39

Fischer, Emily M. "Infinitely Many Rotationally Symmetric Solutions to a Class of Semilinear Laplace-Beltrami Equations on the Unit Sphere." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/hmc_theses/62.

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I show that a class of semilinear Laplace-Beltrami equations has infinitely many solutions on the unit sphere which are symmetric with respect to rotations around some axis. This equation corresponds to a singular ordinary differential equation, which we solve using energy analysis. We obtain a Pohozaev-type identity to prove that the energy is continuously increasing with the initial condition and then use phase plane analysis to prove the existence of infinitely many solutions.

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Ritter, Patricia Diana. "Threelogy in two parts 3-algebras in BLG models and a study of TMG solutions." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/5863.

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This thesis is a review of research done over the course of the past 4 years, divided into two unrelated parts. The rst is set in the context of Bagger-Lambert-Gustavsson models, based on 3-Lie algebras. In particular I will describe theories with metric 3-algebras of inde nite signature: these present elds with negative kinetic terms. The problem can be solved by gaugeing away the non-physical degrees of freedom, to obtain other well understood theories. I will show how this procedure can be easily applied for 3-algebra metrics of any inde nite signature. Part II of this thesis focuses on sol

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41

Miraglio, Pietro. "Estimates and rigidity for stable solutions to some nonlinear elliptic problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668832.

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My thesis deals with the study of elliptic PDE. It is divided into two parts, the first one concerning a nonlinear equation involving the p-Laplacian, and the second one focused on a nonlocal problem. In the first part, we study the regularity of stable solutions to a nonlinear equation involving the p-Laplacian in a bounded domain. This is the nonlinear version of the widely studied semilinear equation involving the classical Laplacian. Stable solutions to semilinear equations have been very recently proved to be bounded, and therefore smooth, up to dimension n=9 by Cabré, Figalli, Ros-Oto

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42

Zabzina, Natalia. "Mathematical modelling approach to collective decision-making." Doctoral thesis, Uppsala universitet, Tillämpad matematik och statistik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-314903.

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In everyday situations individuals make decisions. For example, a tourist usually chooses a crowded or recommended restaurant to have dinner. Perhaps it is an individual decision, but the observed pattern of decision-making is a collective phenomenon. Collective behaviour emerges from the local interactions that give rise to a complex pattern at the group level. In our example, the recommendations or simple copying the choices of others make a crowded restaurant even more crowded. The rules of interaction between individuals are important to study. Such studies should be complemented by biolog

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43

Cozzi, M. "QUALITATIVE PROPERTIES OF SOLUTIONS OF NONLINEAR ANISOTROPIC PDES IN LOCAL AND NONLOCAL SETTINGS." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/345873.

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La tesi è dedicata allo studio di varie proprietà qualitative possedute dalle soluzioni di equazioni ellittiche poste nello spazio euclideo. L'attenzione principale del lavoro è rivolta a soluzioni intere di equazioni anisotrope/eterogenee che mostrano qualche genere di proprietà di simmetria e, in particolare, che posseggono simmetria unidimensionale. L'elaborato è diviso in due parti. La prima parte è riservata ad equazioni alle derivate parziali locali, mentre la seconda si concentra su di una classe meno usuale di equazioni non locali, determinate da operatori integrali.<br>The thesis is

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Rippl, Michael [Verfasser], Thomas [Akademischer Betreuer] Huckle, Bruno [Gutachter] Lang, and Thomas [Gutachter] Huckle. "Parallel Algorithms for the Solution of Banded Symmetric Generalized Eigenvalue Problems / Michael Rippl ; Gutachter: Bruno Lang, Thomas Huckle ; Betreuer: Thomas Huckle." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1230985379/34.

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Amorim, Charles Braga. "Existência e simetrias para uma equação elíptica não-linear com potencial monopolar e anisotrópico." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/5810.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>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 resu

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Tremper, Paul [Verfasser], та U. [Akademischer Betreuer] Nierste. "Aspects of CP Violation - An E6 Symmetric Nelson-Barr Model and a Supersymmetric Solution to ϵ′κ/ϵκ / Paul Tremper ; Betreuer: U. Nierste". Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1162541040/34.

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Lemée, Thomas. "Shear-flow instabilities in closed flow." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112038.

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Cette étude se concentre sur la compréhension de la physique des instabilités dans différents écoulements de cisaillement, particulièrement la cavité entraînée et la cavité thermocapillaire, où l'écoulement d'un fluide incompressible est assuré soit par le mouvement d’une ou plusieurs parois, soit par des contraintes d’origine thermique.Un code spectral a été validé sur le cas très étudié de la cavité entrainée par une paroi mobile. Il est démontré dans ce cas que l'écoulement transit d'un régime stationnaire à un instationnaire au-delà d'une valeur critique du nombre de Reynolds. Ce travail e

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Naz, Rehana. "Symmetry solutions and conservation laws for some partial differential equations in fluid mechanics." Thesis, 2009. http://hdl.handle.net/10539/6982.

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ABSTRACT In jet problems the conserved quantity plays a central role in the solution process. The conserved quantities for laminar jets have been established either from physical arguments or by integrating Prandtl's momentum boundary layer equation across the jet and using the boundary conditions and the continuity equation. This method of deriving conserved quantities is not entirely systematic and in problems such as the wall jet requires considerable mathematical and physical insight. A systematic way to derive the conserved quantities for jet °ows using conservation laws is prese

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Huang, Jian-Wei, and 黃建瑋. "Solution of axial symmetry circular plate on Pasternak foundation by DQEM." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/88350329502035992398.

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碩士<br>國立成功大學<br>系統及船舶機電工程學系碩博士班<br>92<br>The coupling of solutions at discrete points is strong by using the differential quadrature element method (DQEM). Thus, convergence and accurate can be assured by using less discrete points and less arithmetic operations which can reduce the computer CPU time required. 　　Like FEM, in using DQEM to solve a problem the domain is separated into many elements. The DQ discretization is carried out on an element-basis. The discretized governing differential or partial differential equations defined on the elements, transition conditions on inter-element boun

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Denis, Nikolaos Athanasios. "Solution of optimization problems with spatial symmetry and applications to adaptive optics." 1998. https://scholarworks.umass.edu/dissertations/AAI9909160.

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The essential characteristics of large systems is their high dimensionality due to which conventional control techniques fail to give reasonable solutions with reasonable computational efforts. A number of large systems encountered in practice are composed of subsystems with similar dynamics interconnected in a symmetrical fashion. The analysis and control of a large system with these particular features must take advantage of the existing structural properties to achieve computational simplifications of the overall problem. The focus of this thesis is the feedback design and analysis of large

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