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Gould, Barbara W. "A tonology of Yamba." Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/441108.
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This paper deals with the tonology of Yamba, a previously undescribed West African language spoken in northeastern Cameroons along the Nigerian border. It is classified as an Eastern Grassfields Bantu language belonging to the Benue-Congo group of Niger-Congo languages.The tonology of the language is first discussed from the viewpoint of the overall system of tones and tone melodies. The following chapters deal with the manifestation of this system on individual word classes: nouns, pronouns, adjectives, verbs, adverbs, and auxiliaries. Reduplication is discussed separately in the last chapter because reduplicated words frequently do not have the same set of tone melodies that otherwise belong to their respective word classes.
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Zhang, Yongbing. "The contact Yamabe flow." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981625061.
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Djadli, Zindine. "Equations de yamabe perturbees." Cergy-Pontoise, 1998. http://www.theses.fr/1998CERG0037.
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On etudie des equations non lineaires avec exposant de sobolev critique sur des varietes riemanniennes compactes. Plus precisement, on considere a, f et h trois fonctions de classe c sur une variete riemannienne compacte, sans bord, et de dimension n, (m,g), et on etudie l'equation suivante gu + au = fu n + 2 / n 2 + hu q ou 1 < q < n+2/n2 est un reel fixe. Dans un premier temps, on prouve des resultats d'existence d'une solution strictement positive et de classe c. Dans une seconde partie, on montre un resultat d'unicite lorsque a, f et h sont des constantes strictement positives. Finalement, on etudie cette equation sous des hypotheses d'invariance des donnees sous des symetries, ce qui permet de resoudre le meme type d'equation pour des exposants sur critiques.
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Naveira, Miguel Alfredo Carid. "Yama Yama." Florianópolis, SC, 2007. http://repositorio.ufsc.br/xmlui/handle/123456789/89735.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas. Programa de Pós-Graduação em Antropologia SocialMade available in DSpace on 2012-10-23T02:10:47Z (GMT). No. of bitstreams: 1 241193.pdf: 8258266 bytes, checksum: 731d30c3f7b6af9ee449c18ce5f3d3f2 (MD5)
Embora se funde na vida e na etnografia, esta tese toda gira direta ou indiretamente em torno da memória: memória dos nomes, que sublinha tanto o vínculo da pertença como da diferença, ou seja, a marca da história na substância; memória das aldeias, que é sempre memória de um trânsito, de uma divisão, dos parentes que moram em outro lugar, memória determinante de ser parte e não Todo; músicas da memória, que são um pouco de memória em estado puro, o que se pensa nas pessoas; vingança, que é permanência da memória e movimento contínuo do pensamento; memória doentia do vegetal (puxta vëte), que inflama o desejo e reduz o corpo; memória do esquecimento, memória que falta aos parentes celestiais. No âmago da memória, os cantos yama yama. Uma das expressões mais claras dos problemas que os Yaminahua (Alto Ucayali, Peru) têm tanto para viver juntos como para viver separados. Como dizem os Yaminahua, os yama yama se cantam para alguém, e são as relações todas com esses alguém que constroem a pessoa e os cantos. Afinal, é aí, à luz de um espaço biográfico desenhado à surdina das ausências, que melhor pode observar-se o espaço dilemático em que se desenvolvem as relações sociais yaminahua. Entre a tristeza que provoca o pensar continuado e a alegria da festa e da convivência, os Yaminahua se encontram na transversal da vida. A par do mapa social, pode notar-se um mapa complexo de afetos que tecem uma rede permanente de ires, vires e perdas.
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Leandro, Neto Benedito. "Solitons de Yamabe e métricas CPE." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.11.T.19359.
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Tese (doutorado)—Universidade de Brasília, Instituto de Ciências Exatas, Programa de Pós-Graduação em Matemática, 2015.Submitted by Patrícia Nunes da Silva (patricia@bce.unb.br) on 2016-01-26T14:54:49Z No. of bitstreams: 1 2015_BeneditoLeandroNeto_Parcial.pdf: 248614 bytes, checksum: aa0e94e4558b4314ccdb73a1bce22eaf (MD5)
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Provamos que (anti)self dual solitons gradientes (quasi) Yamabe com curvatura seccional positiva são rotacionais simétricos. Além disso, mostramos que, (anti)self dual solitons gradientes de Yamabe tem uma estrutura de produto torcido muito particular desde que a função potencial não tenha pontos críticos. Consideramos solitons gradientes de Yamabe conformes a espaços pseudo-Euclidianos n-dimensionais. Caracterizamos todos os solitons que são invariantes pela ação de um grupo de translação (n-1)-dimensional e obtemos os solitons tipo estável. Como aplicação, obtemos um exemplo de soliton gradiente de Yamabe estável completo, conforme a um espaço Lorentziano. Investigamos também os pontos críticos do funcional curvatura escalar total restrito a um espaço de métricas com curvatura escalar constante e volume unitátio que denotamos por métricas CPE. Foi conjecturado nos anos 1980 que toda métrica CPE é, necessariamente, Einstein. Provamos que métricas CPE, no caso de dimensão quatro, com tensor W+ harmônico são isométricas à esfera S4 dada uma condição integral. No caso n-dimensional, provamos uma condição necessária e suficiente sobre a norma do gradiente da função potencial para que a métrica CPE seja Einstein.
We prove that an (anti)self dual quasi Yamabe gradient soliton with positive sectional curvature is rotationally symmetric. We also prove that four dimensional (anti) self dual gradient Yamabe soliton has a special warped product structure provided that the potential function has no critical points. We consider gradient Yamabe solitons, conformal to an n-dimensional pseudo-Euclidean space. We characterize all such solitons which are invariant under the action of an (n-1)-dimensional translation group and we obtain the steady solitons. Applications provide an explicit example of a complete steady gradient Yamabe soliton, conformal to the Lorentzian space. We also investigate the critical points of the total scalar curvature functional restricted to space of metrics with constant scalar curvature of unitary volume, for simplicity CPE metrics. It was conjectured in the 1980's that every CPE metric must be Einstein. We prove that a 4-dimensional CPE metric with harmonic tensor W+ must be isometric to a round sphere S4 provided an integral condition is satisfied. We also give a necessary and sufficient condition on the norm of the gradient of the potential function for a CPE metric to be Einstein.
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Adames, Marcio Rostirolla. "Os invariantes de Perelman e Yamabe." Florianópolis, SC, 2008. http://repositorio.ufsc.br/xmlui/handle/123456789/91207.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Matemática e Computação Científica.Made available in DSpace on 2012-10-23T19:52:15Z (GMT). No. of bitstreams: 1 248382.pdf: 390919 bytes, checksum: 7fcbdb3407b73db7794b8e411f407887 (MD5)
Definimos o Laplaciano e a Curvatura Escalar sobre uma variedade M e os invariantes de Yamabe e de Perelman. Provamos que eles são iguais quando o primeiro é não positivo e que o invariante de Perelman é igual a mais infinito quando o invariante de Yamabe é positivo.
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Sayed, Safaa El. "Chirurgie et second invariant de Yamabe." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0039/document.
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Le but dans cette thèse est d'expliciter les liens entre les propriétés analytiques, géométriques et topologiques des variétés compactes de dimension n supérieure ou égale à 3 et le comportement des valeurs propres de l'opérateur de Yamabe. On commence par étudier les propriétés de ces valeurs propres : l'un des remarques principales est que leur signe est invariant par un changement conforme de métriques. On s'intéresse plus particulièrement à la deuxième valeur propre de l'opérateur de Yamabe et on fait le lien entre son signe et l'existence des solutions nodales de l'équation de Yamabe. Pour finir, nous donnons une formule de chirurgie pour le second invariant de Yamabe, qui nous permet d'en obtenir une borne inférieure sous certaines hypothèses topologiquesThe goal of this thesis is to study the relationships between the analytical, geometrical and topological properties of compact manifolds of dimension n greater or equal to 3 and the behavior of the eigenvalues of the Yamabe operator. We start by studying the properties of these eigenvalues : One of the most important observation is that their sign is a conformal invariant. We are interested particulary by the study of the seconf eigenvalue of the Yamabe operator and we enlight the relations between its sign and the existence of nodal solutions of the Yamabe equation. At last, we etablish a surgery formula for the second Yamabe invariant which allows to obtain a lower bond for the second Yamabe invariant under some topological hypothesis
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Paute, Jean-Pierre. "Histoire et création littéraire chez Alejo Carpentier : recherches sur ecue-yamba-o." Toulouse 2, 1986. http://www.theses.fr/1986TOU20069.
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La thèse prend appui sur le premier roman d'Alejo Carpentier pour étudier les differents "contextes" historico-économique, culturel, litteraire auxquels se rattache le noir de Ecue-yamba-o. Malgré des coordonnées spatio-temporelles volontairement imprécises, le roman permet ainsi de reconstituer les circonstances qui firent de la cuba républicaine l'objet des visees imperialistes nord-americaines. Les travailleurs du sucre, les noirs en particulier, apparaissent comme les victimes d'un systéme inique et aliénant qui les exclut de l'histoire contemporaine. Cette étude fait une large place à deux des principales manifestations de l'héritage africain à cuba : la musique afro-cubaine et la santeria, dont la présence massive dans ecue suggère la vigueur des traditions po- pulaires et ancestrales. Dans les deux cas les perspectives diachronique et synchronique sont combinees afin de retracer l'évolution de la cultu- re africaine, de décrire et d'interpréter les formes originales syncrétiques qu'elle a prises dans un nouvel environnement. Ce travail montre aussi que la réhabilitation des valeurs de civilisation d'origine africaine va de pair avec une volonté de renouveler la pratique littéraire a cuba. La structure mythique de "ecue-yamba-o", atteste un refus du réalisme étroit qui caractérisera la production posterieure de Carpentier. Le roman est enfin replacé dans le climat d'effervescence sociale et culturelle des années 30 à Cuba qui voit des courants très divers se fondre dans un nationalisme littéraire au sein duquel ecue prend place comme première manifestation romanesque du négrisme. Dans chacun des contextes, le monde noir est montré comme faisant parti intégrante du patrimoine national. Le "roman afro-cubain" de Carpentier illustre ainsi le concept de "transculturation" cher à F. Ortiz et contribue, malgré des faiblesses, à l'expression de l'identité nationale et culturelle de la grande île.
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Paute, Jean-Pierre. "Histoire et création littéraire chez Alejo Carpentier recherches sur "Ecue-Yamba-O /." Lille 3 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37600302w.
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Amacha, Inas. "Flot de Yamabe avec courbure scalaire prescrite." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0109/document.
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Cette thèse est consacrée à l'étude d'une famille des flots géométriques associés au problème de la courbure scalaire prescrite sur une variété riemannienne compacte. Plus précisément, si on désigne par (M,g0) une variété riemannienne compacte de dimension n≥3, et si F∈C∞ (M) est une fonction donnée, le problème de la courbure scalaire prescrite consiste à trouver une métrique g conforme à g0 telle que F soit sa courbure scalaire. Ce problème est équivalent à la résolution de l'EDP suivante :-4 (n-1)/(n-2) ∆u+R0 u=Fu((n+2)/(n-2 )) , u>0 , (E), Où R0 est la courbure scalaire de la métrique initiale g0 et ∆ est le laplacien associé à g0. Il s'agit d'une équation elliptique non-linéaire dont la difficulté principale provient du terme u((n+2)/(n-2 )). Hormis le cas de la sphère standard Sn , tous les travaux consacrés à l'étude de l'équation (E) sont basés sur la méthode variationnelle. Dans cette thèse, on développe une autre approche basée sur l'étude d'une famille de flots géométriques qui permet, entre autres, de résoudre l'équation (E). La question dépend bien entendu de la métrique initiale g0 et en particulier du signe de sa courbure scalaire R0. Les flots introduits sont des flots de gradient associés à deux fonctionnelles distinctes dépendant du signe de R0. La première partie de cette thèse est consacrée au cas R0<0 et dans la deuxième partie on traite le cas R0>0. Dans les deux cas, on démontre l'existence globale du flot et on étudie son comportement asymptotique à l'infiniThis thesis is devoted to the study of a family of geometric flows associated with the prescribed scalar curvature problem. More precisely, if we denote by (M,g0) a compact riemannian manifold with dimension n≥3, and if F∈C∞ (M) is a given function, the prescribed scalar curvature problem consists of finding a conformal metric g to g0 such that F is its scalar curvature. This problem is equivalent to the resolution of the following PDE : -4 (n-1)/(n-2) ∆u+R0 u=Fu((n+2)/(n-2 )) , u>0 , (E), Where R0 is the scalar curvature of the initial metric g0 and ∆ is the laplacian associated with g0.It is a nonlinear elliptic equation, whose the main difficulty comes from the term u((n+2)/(n-2 )). Apart from the case of the standard sphere Sn all the works that study the equation (E) are based on the variational method. In this thesis, we develop another approach based on the study of a family of geometric flows which allows to solve equation (E).The flows introduced are gradient flows associated with two distinct functional functions depending on the sign of R0.The first part of this thesis is devoted to the case R0<0 and in the second part we treat the case R0>0. In both cases, our aim is to proof the global existence of the flow and study its asymptotic behavior at infinity
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Moller, Natalia Salome. "O fluxo de Yamabe sobre variedades compactas." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/EABA-96SJSG.
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In this work we study the Yamabe flow, with some basic properties and we ensure the existence and unity for positive and small times. We prove the global existence and the asymptotic behavior, when the Yamabe invariant in negative or null. In this cases, we see that the scalar curvature
tends to some constant scalar curvature when the time tends to infinity.Nesse trabalho estudamos o Fluxo de Yamabe, junto com algumas propriedades básicas e garantimos a existência e unicidade para tempos positivos e pequenos. Provamos a existência global e o comportamento assintótico quando o invariante de Yamabe é negativo ou nulo. Nesses casos, vemos que a curvatura escalar tende para uma curvatura escalar constante quando o tempo tende ao infinito.
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Orr, Pauline. "Geochemistry and petrology of the Yamba Lake kimberlites, central Slave province, Northwest Territories." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28973.pdf.
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Užkuraitienė, Fausta. "Lietuvos Yamaha muzikos mokyklų valdymo ypatumai: franšizės metodas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070816_161711-77007.
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Franšizė yra viena iš tarptautinio verslo internacionalizavimo galimybių. Teoretikai ir praktikai pabrėžia šios verslo formos pranašumus prieš alternatyvas eksportą, investicijas ar bendrų kompanijų kūrimą. Tačiau Lietuvos mokslininkų darbuose randame tik fragmentinius šios kontraktinės tarptautinio verslo plėtros formos analizės elementus. Menkai analizuojami valdymo, kontrolės, kultūrinės adaptacijos klausimai. Tyrimo tikslas - įvertinti Lietuvos Yamaha muzikos mokyklų valdymo ypatumus, veikiant franšizės pagrindu Lietuvoje. Tyrimo hipotezė: pedagogams ir vadovams yra priimtina Yamaha muzikos mokyklos valdymo koncepcija. Tyrimo uždaviniai: 1. Įvertinti franšizės vaidmenį tarptautinio verslo kontekste; 2. Įvertinti franšizės teisinius ir vadybinius aspektus; 3. Pateikti Yamaha muzikos mokyklų tinklo veiklos bendruosius aspektus; 4. Ištirti valdymo ypatumus Yamaha muzikos mokyklose Lietuvoje. Atlikus Yamaha muzikos mokyklų pedagogų ir vadovų anketinę apklausą pastebėta, kad Japonijos kompanijos mokyklos valdymo koncepcija pritapo Lietuvoje ir yra realizuojama. Visi respondentai tenkina sutartyje iškeltus kvalifikacinius reikalavimus. Veikla organizuojama remiantis sutarties nuostatomis, kurios iš esmės atitinka LR CK įtvirtintas nuostatas. Skirtingai nei Japonų kultūroje įprasta, pedagogai labiau linkę į individualų darbą, tačiau tai nesudaro esminių problemų realizuojant pagrindinį mokyklos moto: „Mokykis su malonumu“.A franchise is one of possibilities to global business internationalization. Theorists and practician emphasizes this form of business advantages comparing with export, investment or joint venture. But Lithuanian scientists revive this form of international business doing just fragmentary. Poorly are explored mechanisms of management, control and cultural adaptation. The aim of research is to evaluate peculiarities of Yamaha music school management in Lithuania. Research hypothesis – to educators and school managers is acceptable conception of Yamaha music school. Research tasks: 1. Evaluate role of franchise in context of international business; 2. Evaluate juridical and management dimensions; 3. Represent main aspects of Yamaha music school network worldwide and in Lithuania; 4. Explore peculiarities of Yamaha music schools management in Lithuania. The results of educators and managers interview shows that main concept of Yamaha music school is acceptable and realizable. All respondents pass requirements of qualification. Activity is organized by contract requirements, which essentially pass the main requirements of Civil Code. As distinct from Japanese culture in Lithuania educators prefer individual work with children. But it does not impact to main motto: “Learn with pleasure” implementation.
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Gomes, Bernardo Paschoarelli Veiga. "A versão discreta da conjectura de Markus-Yamabe." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-05062010-173022/.
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O principal objetivo desta tese é estudar os difeomorfismos planares que satisfazem as hipóteses da Versão Modificada da Conjectura Discreta de Markus-Yamabe. Para estes difeomorfismos, definimos um conceito construtivo de número de rotação. Além disto, exibimos um contra-exemplo para a Versão Modificada da Conjectura Discreta de Markus-Yamabe que apresenta uma intersecção homoclínica transversal e implica a existência de infinitos pontos periódicos hiperbólicosThe main goal of this thesis is to study the plane diffeomorphisms satisfying the hypothesis of the Modified Version of the Discrete Conjecture of Markus-Yamabe. For these diffeomorphisms, we define a constructive concept of rotation number. Moreover, we present a counter-example to the Modified Version of the Discrete Markus-Yamabe Conjecture which exhibits a transversal homoclinic intersection, implying the existence of infinitely many hyperbolic periodic points
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Colombo, Caio Prisco da Silva Telles Nunes Ranieri. "Estrategias de construcao da marca Yamaha no Brasil." Pontifícia Universidade Católica de São Paulo, 2006. https://tede2.pucsp.br/handle/handle/4839.
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Previous issue date: 2006-10-23Objective: Understand how the japanese brand Yamaha worldwide motorcycle and scooter maker construct its corporate brand among the brazilian target-costumer, with publicities released in the Moto magazine in 2005. Justification: The importance of branding studies in the corporate market on the 21th century. Hipothesis: The power of Yamaha brand has its origin in the construction of symbolic and intangible values attributed or associated to the company and its products. Methodology: Peircean semiotics. Results: The hipothesis was confirmed. The power of Yamaha brand in the brazilian market results from the symbolic values attributed to the company it self by publicity
Objetivo: Compreender como a empresa japonesa Yamaha fabricante mundial de motocicletas e motonetas constrói a sua marca corporativa junto ao público consumidor brasileiro, por meio de publicidades veiculadas na revista Moto em 2005. Justificativa: A importância estratégica do estudo da construção de marcas no mercado empresarial do século XXI. Hipótese: O poder da marca Yamaha tem sua origem na construção de valores simbólicos e intangíveis atribuídos ou associados à empresa e seus produtos. Metodologia: Semiótica peirceana. Resultados: A hipótese foi comprovada. O poder da marca Yamaha no mercado brasileiro é resultado dos valores simbólicos atribuídos ao fabricante pela publicidade
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Mondello, Ilaria. "Le problème de Yamabe sur les espaces stratifiés." Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=a82f7d20-528d-484f-a6dc-37dd590c9a54.
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On étudie une classe d’espaces métriques singuliers, les espaces stratifiés, et on se propose d’étendre à ces derniers des résultats de géométrie riemannienne et d’analyse sur les variétés. Dans une première partie, on montre l’existence d’une borne inférieure pour le bas du spectre du Laplacien, sous une hypothèse géométrique de minoration de la courbure de Ricci. Cela permet également de démontrer l’existence d’une inégalité de Sobolev dont les constantes dépendent uniquement du volume et de la dimension de l’espace, et d’une borne supérieure pour le diamètre. En outre, on prouve que la borne pour le diamètre est atteinte si et seulement si celle pour le bas du spectre l’est aussi. La deuxième partie de ce manuscrit est dédiée aux conséquences des résultats précédents sur le problème de Yamabe pour un espace stratifié : ce problème consiste à chercher une métrique conforme à courbure scalaire constante, et l’existence d’une solution dépend d’un invariant conforme, la constante de Yamabe locale, dont la valeur est en général inconnue. On montre que celle-ci peut-être calculée en un grand nombre de cas, lorsque une hypothèse géométrique sur le lieu singulier est vérifiée. On utilise des techniques liées aux inégalités isopérimétrique et de Sobolev. Enfin, on donne une classe d’exemples pour lesquels on peut prouver qu’une métrique conforme à courbure scalaire constante existeWe study a class of singular metric spaces, stratified spaces, with an approach whose goal is to extend to these latter some tools and results of Riemannian geometry and analysis on smooth manifolds. In a first part, we show the existence of a lower bound for the bottom of the spectrum of the Laplacian, under the assumption that the Ricci curvature is bounded by below. This allows us to prove also the existence of a Sobolev inequality whose constants only depend on the volume and of the dimension of the space, and of an upper bound for the diameter. Furthermore, we prove that the bound for the diameter is attained if and only if the one for the bottom of the spectrum is attained as well. The second part is devoted to the direct consequences of the previous results on the Yamabe problem on a stratified space: this problem consists in looking for a conformal metric with constant scalar curvature, and the existence of a solution depends on a conformal invariant, the local Yamabe constant, whose value is generally unknown. We show that this latter can be computed in a large number of cases, when a geometric hypothesis on the singular set is verified. We use techniques which are related to the Sobolev and the isoperimetric inequalities. Finally, we give a class of examples for which we can prove the existence of a conformal metric with constant scalar curvature
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Lemos, Flavio Almeida. "O segundo invariante de Yamabe sobre variedades CR." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/EABA-9B2JMU.
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No final dos anos 70 e início dos anos 80, a geometria das variedades CR, modelo abstratode hipersuperfícies reais em variedades complexas, atraiu a atenção de importantes matemáticos tais como Chern, Moser, Fefferman, Jacobowitz, D. Jerison, J. Lee, Tanaka,Webster, entre outros. Essa geometria é particularmente rica quando a variedade CR e estritamente pseudoconvexa. Nesse caso, existe uma estreita relação entre sua geometriae a geometria das variedades Riemannianas. Uma estrutura pseudohermitiana para uma variedade M munida de uma CR-estrutura T1;0(M) é uma forma de contato 0 que aniquilaa distribuição de Levi H(M) = RefT1;0 + T0;1g, em que T0;1 = T1;0. Tal estrutura determinauma forma Hermitiana natural sobre a CR-estrutura T1;0(M), denominada forma deLevi e denotada por Lo. A forma de Levi é bem definida (para cada CR-estrutura) módulo multiplicação por uma função suave, exatamente como ocorre na geometria Riemanniana conforme. Quando Lo é uma forma definida, dizemos que (M; ) é uma variedade pseudohermitiana estritamente pseudoconvexa. Nesse caso, se M é orientável, o fibrado deaniquiladores da distribuição de Levi H(M)? = f 2 T(M) : H(M) kerg é trivial.Portanto, H(M)? admite uma orientação natural. Assim dizemos que uma estrutura pseudohermitiana 0 é positiva, se a forma de Levi associada é positiva definida.
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Demuner, Daniela Paula. "Resultados recentes relativos à conjectura fraca de Markus-Yamabe." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-14122017-114529/.
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C. Olech |28] provou que os problemas de estabilidade assintótica global de campos de vetores no Rn e injetividade global de aplicações do Rn nele próprio estão interrelacionados. Neste contexto, deparamo-nos com a Conjectura Fraca de Markus-Yamabe, cujo enunciado é o seguinte: Se F : Rn → Rn é uma aplicação de classe Cl tal que para todo ponto p ∈ Rn, todos os autovalores da derivada DF(p) têm parte real negativa, então F é uma aplicação injetiva. O objetivo deste trabalho é apresentar alguns resultados referentes a esta conjectura.It has been shown by C. Olech [28] that global asymptotic stability of vector fields of Rn and global injectivity of maps from Rn into itself are interrelated problems. In this context we have the Weak Markus-Yamabe Conjecture whose statement is as follows: If F : Rn → Rn be a C1 map such that for all p ∈ Rn, all the eigenvalues of the derivative DF(p) have negativo real part, then F is an injective map. In this work we present, some results related to this conjecture.
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Caju, Rayssa Helena Aires de Lima. "Um Teorema de Compacidade para o Problema de Yamabe." Universidade Federal da Paraíba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/8063.
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
In this paper we prove the compactness of the full set of solutions of the Yamabe problem when n 24. We begin with the study of basic properties of blow-up points and then prove sharp pointwise estimates that will be crucial for the proof of Weyl Vanishing Theorem in these dimensions. The compactness problem then reduces to show the positivity of a certain quadratic form. We also show that this quadratic form has negative eingenvalues, if n 25. It is noteworthy that during this process the Positive Mass Theorem is a key tool in obtaining the main result.
Neste trabalho provaremos a compacidade do conjunto de solu cões do problema de Yamabe quando n 24. Iniciaremos com o estudo das propriedades báasicas de pontos de blow-up e em seguida provaremos estimativas pontuais, ótimas em certo sentido, que ser~ao de fundamental importância para a demonstra cão do Teorema do Anulamento de Weyl nestas dimensoes. O problema de compacidade ent~ao se reduz a mostrar a positividade de uma certa forma quadr atica. Provaremos ainda que, se n 25, tal forma quadr atica tem autovalores negativos. Vale ressaltar que durante tal processo o Teorema de Massa Positiva ser a uma ferramenta chave na obten cão do resultado principal.
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Geisse, Elisabeth. "On Being: The Fictional Yamas and Niyamas." Cleveland State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=csu1481124015984363.
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Adriano, Levi Rosa. "Equações tipo yamabe e algumas desigualdades numa classe de variedades." reponame:Repositório Institucional da UnB, 2010. http://repositorio.unb.br/handle/10482/8795.
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Tese (doutorado)-Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Matemática, 2010.Submitted by Jaqueline Ferreira de Souza (jaquefs.braz@gmail.com) on 2011-06-29T21:57:40Z No. of bitstreams: 1 2010_LeviRosaAdriano.pdf: 444831 bytes, checksum: 1bf3e8612d16f62001c640a24133ba4b (MD5)
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Neste trabalho, consideramos variedades completas, não-compactas, satisfazendo alguma hipótese sobre a curvatura de Ricci radial. Na primeira parte, obtemos algumas estimativas `a priori e também a questão de existência para equações tipo Yamabe em tais variedades. Como consequência destes resultados, mostramos um teorema de existência de métricas conformes com curvatura escalar dada. Na segunda parte, estudamos algumas famílias de desigualdades clássicas da análise. Entre outras coisas, mostramos que uma variedade completa, não-compacta, satisfazendo a propriedade do volume duplicado e tal que vale alguma desigualdade de Gagliardo- Nirenberg, possui máximo crescimento de volume. Também mostramos que variedades completas n˜ao compactas com curvatura de Ricci não negativa e que satisfazem alguma desigualdade de Log-Sobolev ou de Hardy, com uma constante “próxima”da melhor constante do caso Euclideano, são difeomorfas a este último. ___________________________________________________________________________________________ ABSTRACT
In this work, we consider complete non-compact manifolds, satisfying some hypothesis about the radial Ricci curvature. In the first part, we obtain some priori estimates and also the question of existence for Yamabe type equations in such manifolds. As a consequence of these results, we show a theorem of existence of conformal metrics with scalar curvature given. In the second part, we study some families of classical inequalities of analysis. Among other things, we show that a complete non-compact manifold satisfying the doubling volume property and such that some inequality of Gagliardo-Nirenberg holds, has maximal volume growth. We also show that non-compact manifolds with non-negative Ricci curvature and satisfying some inequality of Log-Sobolev or Hardy, with a constant “ close ”to the best constant of the Euclidean case are diffeomorphics to the latter.
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Sougnabe, Pabame. "Pastoralisme en quête d'espaces en savane tchadienne : des Peul autour de la Forêt Classée de Yamba Berté." Paris, EHESS, 2010. http://www.theses.fr/2010EHES0165.
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Dans la zone de savane du Tchad, c'est l'usage agricole qui structure l'espace. L'espace pastoral lui est entièrement subordonné. Il évolue ainsi en fonction des saisons, de l'alternance de mise en culture et de jachère. Que la densité soit forte ou faible, l'organisation de l'espace ne tient pas compte de la présence des troupeaux. L'espace est soumis entièrement aux activités agricoles et ne reste que les espaces impropres à l'agriculture. Les populations autochtones même s’ils épargnent de plus en plus dans le bétail, ont adopté des stratégies d'extension des surfaces agricoles sans tenir compte des activités pastorales. Elles installent des champs qui prennent de plus en plus d'ampleur à cause du développement de la culture attelée et de la baisse de la fertilité du sol. Les pasteurs transhumants ont de réelles difficultés de mouvement. Le déclin des systèmes pastoraux en zone de savane du Tchad semble principalement être dû aux politiques de développement inadaptées sur les espaces pastoraux, avec notamment un régime foncier qui donnent largement l'avantage aux activités agricoles et la protection forestièreIn the savannah region of Chad, agricultural use structures space. Pastoral space use itself is entirely subordinate to it. It thus evolves with seasons, rotational system of farming and fallow. Whether it's high or low density, the organization of space does not take into account the existence of herds. The space is entirely subjected to agricultural activities and remains only spaces unsuitable for agriculture. The native populations even if they invest more and more in cattle, have adopted strategies for extension of agricultural land without taking into account the pastoral activities. They have more and more increased their agricultural land fields because of the development of yoking and reduction of soil fertility. The transhumant shepherds have real difficulties of movement. The decline of the pastoral systems in savannah region of Chad seems to be mainly due to policies of development unsuited to pastoral spaces, with in particular a land ownership regulation system which largely favor agricultural activities and forest protection
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Torre, Pedraza Azahara de la. "On the fractional Yamabe problem with isolated singularities and related issues." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404450.
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My research is based on non-local elliptic semilinear equations in conformal geometry. The fractional curvature is defined from the conformal fractional Laplacian and it is a non-local version of some of the classical local curvatures such as the scalar curvature, the fourth-order Q-curvature or the mean curvature. This new notion of non-local curvature has good conformal properties that allow to treat classical problems from a more general convexity point of view. Note that the fractional curvature in my research is different from the one defined by Caffarelli, Roquejoffre and Savin .
In particular, I have worked on the fractional singular Yamabe problem and related issues. This problem arises in conformal geometry when we try to find a conformal metric to a given one having constant fractional curvature and prescribed singularities. The precise problem I considered in my thesis was to find solutions for the fractional Yamabe problem in the Eucliden space of dimension bigger than 2¿, 0<¿<1, with prescribed isolated singularities: first, I just considered radial solutions when there is an isolated singularity and, later, the problem of removing a finite number of points.
This thesis consists of nine chapters. First, we give is a brief introduction and summary of the thesis. Next, provide some background, notation and known results. Later, we show the main results, i.e, Chapters 3, 4, 5 and 6. After this, we introduce the research plan to come. The thesis also has two appendixes with useful computations.
I started my research focusing on the geometric interpretation of the problem for an isolated singularity (Chapter 3). This study is based on an extension problem for the computation of the conformal fractional Laplacian. This is a Dirichlet-to-Neumann problem for a degenerate elliptic, but local, equation, which gives an example of a boundary reaction problem where the nonlinearity is of power type with the critical Sobolev exponent.
Later, I treated the problem as an integro-differential equation, facing two main difficulties: the lack of compactness and the fact that we are dealing with a non-local ODE (Chapter 4) . Our study is carried out using variational methods and it proves the existence of Delaunay-type solutions for the problem. These are radially symmetric metrics with constant fractional curvature.
Finally, I applied some gluing methods together with a Lyapunov reduction to construct solutions for the singular fractional Yamabe problem when the singular set consists of a given finite number of points (Chapter 5).
At the moment, I am working on the fractional Caffarelli-Kohn-Nirenberg inequality, which is an interpolation between the Hardy and Sobolev fractional inequalities. In particular, I am looking at the radial symmetry or symmetry breaking of the minimizers (Chapter 6).
I have collaborated with Weiwei Ao (University of British Columbia), María del Mar González (Universidad Autónoma de Madrid), Manuel del Pino (Universidad de Santiago, Chile) and Juncheng Wei (University of British Columbia).Mi investigación se basa en ecuaciones no-locales elípticas semilineales que surgen en la geometría conforme. La curvatura fraccionaria se define partir del Laplaciano fraccionario conforme y es una versión no local de algunas de las curvaturas locales clásicas tales como la curvatura escalar, la Q-curvatura (operador de orden 4) o la curvatura media. Esta nueva noción de curvatura no-local tiene buenas propiedades conformes que permiten tratar problemas clásicos desde un punto de vista de convexidad más general. Debemos tener en cuenta que se trata de una curvatura fraccionaria distinta a la definida por Caffarelli, Roquejoffre y Savin . En particular, he trabajado en el problema de Yamabe singular fraccionario y problemas relacionados. Se trata de un problema que aparece en la geometría conforme cuando intentamos encontrar una métrica conforme a la dada en una variedad, que tenga curvatura fraccionaria constante y singularidades prescritas. Más concretamente, el problema que he considerado para mi tesis es encontrar soluciones para el problema de Yamabe fraccionario en el espacio Euclídeo de dimensión mayor que 2¿, 0<¿<1, con singularidades aisladas prescritas: en primer lugar, consideré sólo soluciones radiales para una singularidad aislada y más adelante, soluciones para este problema cuando el conjunto singular consta de un número finito de puntos. La tesis está compuesta por nueve capítulos. En primer lugar, hacemos una introducción a modo de sumario de la tesis. Después, hay un capítulo conocimientos básicos, notación, historia del problema y resultados previos. En los capítulos 3,4,5 y 6 presentamos los principales resultados de la tesis, que resumimos más abajo. Finalmente, presentamos brevemente la idea de trabajo para el futuro cercano. En la tesis podemos encontrar también, dos apéndices con cálculos y resultados que serán útiles en la lectura de la tesis. El comienzo de mi investigación se basó en la interpretación geométrica del problema para un singularidad aislada (Capítulo 3). Este estudio parte del problema de extensión para calcular el Laplaciano fraccionario conforme. Se trata de un problema Dirichlet-to-Neumann para una ecuación elíptica, pero local, que proporciona un ejemplo del problema de reacción con borde en el que la no-linearidad es del tipo exponente crítico de Sobolev. Más adelante, traté el mismo problema pero desde el punto de vista de una ecuación integro diferencial. Este método presenta dos dificultades principales: la pérdida de compacidad y el hecho de que estamos tratando con una ODE( ecuación diferencial ordinaria ) no local (Capítulo 4). Nuestro estudio es llevado a cabo utilizando el método variacional y prueba la existencia de soluciones ¿del tipo Delaunay¿ para nuestro problema. Estas soluciones son radialmente simétricas y tienen curvatura fraccionaria constante. Por último, he utilizado métodos de "gluing" (o pegado) junto con el método de reducción de Lyapunov para la construcción de soluciones para el problema de Yamabe singular fraccionario cuando el conjunto singular dado está formado por un número finito de puntos (Capítulo 5). Actualmente, estoy trabajando en la generalización de la desigualdad de Caffarelli-Kohn-Nirenberg al caso fraccionario; se trata de una interpolación entre las desigualdades de Hardy y Sobolev fraccionarias. En particular, estoy estudiando la simetría o pérdida de simetría de los minimizantes (Capítulo 6). En la investigación presentada en esta tesis he colaborado con Weiwei Ao (University of British Columbia), María del Mar González (Universidad Autónoma de Madrid), Manuel del Pino (Universidad de Santiago, Chile) y Juncheng Wei (University of British Columbia).
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Schadeberg, Thilo C. "Uo mmoja hautiwi panga mbili: aina za yambwa na maana zake." Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-98108.
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`Kinds of objects and their meanings´ deals with objecthood in Kiswahili. From a syntactic point of view, there is but one kind of object: the distinction between `direct´ and `indirect´ object has no syntactic properties, and one verb can have only one object. Of course, objects can have different semantic roles. This raises questions about the syntactic and semantic functions of `naked´ non-objects, and some of these are approached by inspecting fifty examples of the verb kutia `to put [sth] [into]´ from Sacleux´s dictionary. Three syntactic and semantic frames are distinguished and the respective roles of the arguments are described. Finally, there is a brief discussion about the meaning of the object as such and how it is influenced by the presence of the applicative extension.
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Streil, Manuel [Verfasser], and Bernd [Akademischer Betreuer] Ammann. "Yamabe constants of collapsing Riemannian submersions / Manuel Streil ; Betreuer: Bernd Ammann." Regensburg : Universitätsbibliothek Regensburg, 2016. http://d-nb.info/1118846443/34.
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Dietrich, Gautier. "Nouveaux invariants en géométrie CR et de contact." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS016/document.
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La géométrie de Cauchy-Riemann, CR en abrégé, est la géométrie naturelle des hypersurfaces réelles pseudoconvexes de $C^{n+1}$, lorsque $ngeq 1$. Nous considérons le cas générique où les variétés CR considérées sont de contact. La géométrie CR présente de nombreuses similarités avec la géométrie conforme ; les invariants mis au jour et les techniques éprouvées en géométrie conforme peuvent donc être adaptées dans ce contexte. Nous nous intéressons dans cette thèse à deux invariants de ce type. Dans une première partie, en utilisant la géométrie asymptotiquement hyperbolique complexe, nous introduisons un opérateur différentiel CR covariant agissant sur les applications allant d'une variété CR vers une variété riemannienne, égal pour les fonctions à l'opérateur de Paneitz CR. Dans une seconde partie, nous proposons un invariant de Yamabe pour les variétés de contact admettant une structure CR, et nous étudions son comportement sous somme connexeCauchy-Riemann geometry, CR for short, is the natural geometry of real pseudoconvex hypersurfaces of $C^{n+1}$ for $ngeq 1$. We consider the generic case when CR manifolds are contact manifolds. CR geometry presents strong analogies with conformal geometry; hence, known invariants and techniques of conformal geometry can be transported to that context. We focus in this thesis on two such invariants. In a first part, using asymptotically complex hyperbolic geometry, we introduce a CR covariant differential operator on maps from a CR manifold to a Riemannian manifold, which coincides on functions with the CR Paneitz operator. In a second part, we propose a Yamabe invariant for contact manifolds which admit a CR structure, and we study its behaviour under connected sum
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Englehardt, Patricia Ooi. "The Effect of the Yamaha Music In Education Keyboard Instructional Approach on the Musical and Nonmusical Outcomes of Middle School Students." Scholarly Repository, 2006. http://scholarlyrepository.miami.edu/oa_dissertations/48.
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The purpose of this study was to determine the effect of the Yamaha Music In Education (MIE) keyboard instructional approach on selected musical and nonmusical outcomes of middle school students. One hundred and thirty-four middle school students from Miami, Florida were involved in the study. Experimental group participants (n = 68) received the MIE keyboard instructional approach, and were compared to a control group (n = 66) with no music instruction. The study was implemented for the academic school year from November 2004 to April 2005. Musical outcomes were reflected in students' music achievement and music attitudes. Music achievement was measured using the Iowa Tests of Music Literacy (ITML) (Gordon, 1991), and music attitude was evaluated through the Instrumental Music Attitude Inventory (IMAI) (Fortney, 1992). The nonmusical outcomes included students' motivation and self-esteem, using the Achievement Motivation Profile (AMP-Junior Form) (Mandel, Friedland, & Marcus, 2006), and the Coopersmith Self-Esteem Inventory (SEI) (Coopersmith, 1981) respectively. Report card grades in math and reading, as well as school attendance records were obtained from the participating school to measure students' academic achievement and school attendance.
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Madani, Farid. "Le problème de Yamabe avec singularités et la conjecture de Hebey-Vaugon." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00422095.
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Dans la première partie de cette thèse, on étudie, sur une variété compacte M, le problème de Yamabe avec singularités. Ce problème consiste à chercher une métrique riemannienne conforme à g de courbure scalaire constante, sachant que la métrique g n'a pas la régularité habituelle (elle peut être de classe C^1). Le cas équivariant est également considéré. Pour le résoudre, on commence par étudier les équations de type Yamabe. On montre que les propriétés connues dans le cas C^\infty (le problème de Yamabe) sont encore valides dans notre cas. Sous certaines hypothèses, on montre l'existence et l'unicité des solutions pour le problème de Yamabe avec singularités.La seconde partie de la thèse est consacrée à l'étude de la conjecture de Hebey-Vaugon, énoncée dans le cadre du problème de Yamabe équivariant. On montre que la conjecture est vraie dans certains nouveaux cas, après avoir généralisé un théorème de T. Aubin.
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Moreira, Ana Claudia da Silva. "Técnicas de bifurcação para o problema de Yamabe em variedades com bordo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/45/45131/tde-11032016-162814/.
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Apresentaremos alguns resultados de rigidez e de bifurcação para soluções do problema de Yamabe em variedades produto com bordo.We will discuss some rigidity and bifurcation results for solutions of the Yamabe problem in product manifolds with boundary.
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Diaz, Elkin Dario Cardenas. "Fenômeno de bifurcação no problema de Yamabe sobre variedades riemannianas com bordo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/45/45131/tde-30082016-001339/.
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No presente trabalho consideramos o produto de uma variedade Riemanniana compacta sem bordo de curvatura escalar zero e uma variedade Riemanniana compacta com bordo, curvatura escalar zero e curvatura media constante no bordo, e fazemos uso da teoria de bifurcação para provar a existência de um numero infinito de classes conforme com, pelo menos, duas métricas Riemannianas não homotéticas de curvatura escalar zero e curvatura média constante no bordo, sobre a variedade produto.In this work, we consider the product of a compact Riemannian manifold without boundary, null scalar curvature and a compact Riemannian manifold with boundary, null scalar curvature and constant mean curvature on the boundary and we use the bifurcation theory to prove the existence of a infinite number of conformal classes with at least two non homothetic Riemannian metrics of null scalar curvature and constant mean curvature of the boundary on the product manifold.
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Yaman, Orkun [Verfasser]. "Integration von Hochleistungsrechnern in die PLM-Workflows / Orkun Yaman." Aachen : Shaker, 2010. http://d-nb.info/112436630X/34.
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Kinoshita, Futoshi. "Population and household change of a Japanese village, 1760-1870." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184818.
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This dissertation is an analysis of population and households of a village in Northeast Japan, using historical documents from the period between 1760 and 1870. The population of the village increased 1.73-fold in 110 years with the average growth rate of 0.50 per cent per annum. In general, the population shifted from a low pressure regime characterized by relatively low fertility and low mortality to a high pressure regime with high fertility and high mortality. Fertility was found to be the driving force of the population growth, but high mortality slowed down the growth between 1800 and 1835. Migration played only a minor role. However, migration made a significant impact on the population growth through fertility by changing the nature of service. The increase in fertility resulted mainly from changes in marital fertility rather than changes in nuptiality. The most important factor contributing to the increase in marital fertility was the transformation of labor from servants with yearly contracts to day laborers which increased couple's exposure to the risk of childbearing by affecting coital frequency. In addition, increased employment opportunities and improved wages, which were brought about by the development of market economy and small-scale industry centering around a highly profitable cash crop, safflower, had a positive effect on marital fertility. The number of households increased 1.50-fold throughout the period. An increase in the number of lower class households was solely responsible for the increase in the number of households of the village. The mean household size rose from 4.8 to 5.6. The household size was positively associated with socio-economic status. As in the case of fertility, increased employment opportunities and improved wages were primarily responsible for the increase in the number of households and in the household size. Namely, the increased employment opportunities and improved wages made peasants, especially those of the lower class, less dependent on land, and allowed them to establish new branch households more easily. The most frequently-encountered household types were simple and multiple family households, the two types combined accounting for over 70 per cent of all households of the village. The proportion of multiple family households increased throughout the period, whereas the proportion of simple family households declined.
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Ribeiro, Tiago CaÃla. "Variedades com curvatura prescrita : resultados de existÃncia, unicidade, rigidez e bifurcaÃÃo." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8669.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoCoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
Apresentamos vÃrios resultados de existÃncia, unicidade, rigidez e bifurcaÃÃo para o problema da prescriÃÃo de diversas estruturas geomÃtricas em variedades Riemannianas, entre os quais incluem-se: i) deformaÃÃo e rigidez para estruturas 2k-Einstein em variedades com (2k − 2)-curvatura seccional constante; ii) deformaÃÃo conforme de mÃtricas no contexto do problema de Yamabe para curvaturas de Gauss-Bonnet; iii) unicidade, bifurcaÃÃo e rigidez local no Ãmbito do problema de Yamabe para as funÃÃes simÃtricas dos autovalores do tensor de Schouten.
We present several results of existence, uniqueness, rigidity and bifurcation for the problem of prescribing various geometric structures on Riemannian manifolds, among which include: i) deformation and rigidity for 2k-Einstein structures on manifolds with constant (2k − 2)-sectional curvature; ii) conformal deformation of metrics in the context of the Yamabe Problem for Gauss-Bonnet curvatures; iii) uniqueness, bifurcation and local rigidity in scope of the Yamabe Problem for symmetric functions of eigenvalues of the Schouten tensor.
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Glickenstein, David A. "Precompactness of the Ricci flow and a maximum principle on combinatorial Yamabe flow /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3091326.
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Cruz, Cícero Tiarlos Nogueira. "Hipersuperfícies com bordo livre e rigidez de superfícies mínimas." reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/11874.
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CRUZ, Cícero Tiarlos Nogueira. Hipersuperfícies com bordo livre e rigidez de superfícies mínimas. 2015. 56 f. Tese (Doutorado em Matemática) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2015.Submitted by Erivan Almeida (eneiro@bol.com.br) on 2015-05-06T19:44:15Z No. of bitstreams: 1 2015_tese_ctncruz.pdf: 975083 bytes, checksum: 9407fc51d29686a5e14baf7d34105f98 (MD5)
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In this thesis, we prove estimates for the volume and boundary area of stable hypersurfaces ∑n-1 with nonpositive Yamabe invariant satisfying the free boundary condition in a Riemannian manifold Mn with bounds for the scalar curvature and the mean curvature of the boundary. Assuming further that ∑ is locally volume-minimizing in a manifold M with scalar curvature bounded below by a nonpositive constant, we conclude that locally M splits along ∑ as (-Є, Є)x ∑, for some Є > 0. In the case that ∑ locally minimizes a certain functional inspired by the work of Yau (2001), a neighborhood of ∑ in M is isometric to ((-Є, Є) x ∑, dt2 + e2tg), where g is Ricci at. In the second part, we study other scalar curvature rigidity phenomena adapting a technique developed by Máximo e Nunes (2013) to show a local rigidity result for three-dimensional Riemannian manifold M3 whose scalar curvature is bounded from below by a negative constant. We prove the following result: Let ∑2 ⊂ M3 be a stable minimal surface which locally maximizes the Hawking mass on M. Then M near ∑ is a piece of one the Kottler space.
Nesta tese, provamos estimativas para o volume e área do bordo de hipersuperficies estáveis ∑n-1 com invariante de Yamabe não positivo satisfazendo à condição de bordo livre em uma variedade Riemanniana de dimensão n com limitação na curvatura escalar e curvatura média do bordo. Supondo ainda que ∑ é localmente minimizante de volume em uma variedade M com curvatura escalar limitada inferiormente por uma constante não positiva, concluímos que localmente M divide-se ao longo ∑ como (-Є, Є)x ∑, para algum Є > 0. No caso em que ∑ localmente minimiza um funcional adequado inspirado pelo trabalho de Yau (2001), uma vizinhança de ∑ em M é isométrica a ((-Є, Є) x ∑, dt2 +e2tg), onde g é Ricci plana. Na segunda parte, estudamos outro fenômeno de rigidez pela curvatura escalar adaptando a técnica desenvolvida por Máximo e Nunes (2013) para mostrar um resultado local de rigidez para uma variedade Riemanniana tridimensional M3 cuja curvatura escalar é limitada inferiormente por um constante negativa. Provamos o seguinte resultado: Seja ∑2 ⊂ M3 uma superfície mínima estritamente estável que localmente maximiza a massa Hawking em M. Então M perto de ∑ é um pedaço de um dos espaços de Kottler.
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Neuhoff, Hans. "Yaman und Multānī : Konstanz, Variabilität und Veränderung in zwei nordindischen Rāgas /." Frankfurt am Main ; Bern ; Paris : P. Lang, 1995. http://catalogue.bnf.fr/ark:/12148/cb35785288x.
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Nogueira, Marcelo Aparecido Cabral. "Uma classe de equações tipo Yamabe e teoria de blow-up em H1 2 (M)." Universidade Federal de Viçosa, 2015. http://www.locus.ufv.br/handle/123456789/7921.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Nesta dissertação estudamos uma classe de equações elípticas tipo Yamabe em uma variedade Riemanniana compacta, sem bordo, de dimensão n ≥ 3. Tais equaçõoes tem sido alvo de investigações por décadas. Daremos ênfase a H1 -teoria de blow-up estudando sequências de Palais-Smale associadas com a equação crítica, definindo os pontos de blow-up e provando o teorema de decomposição em bolhas.
In this dissertation we study a class of elliptic Yamabe type equations on a compact Riemannian manifold, without boundary, of dimension n ≥ 3. Such equations have been the target of investigation for decades. The main focus will be on H1 -theory for the blow-up studying Palais-Smale sequences associated with the critical equation, defining the blow-up points and proving the theorem of decomposition in bubbles.
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Taft, Jefferson. "Intrinsic Geometric Flows on Manifolds of Revolution." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194925.
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An intrinsic geometric flow is an evolution of a Riemannian metric by a two-tensor. An extrinsic geometric flow is an evolution of an immersion of a manifold into Euclidean space. An extrinsic flow induces an evolution of a metric because any immersed manifold inherits a Riemannian metric from Euclidean space. In this paper we discuss the inverse problem of specifying an evolution of a metric and then seeking an extrinsic geometric flow which induces the given metric evolution. We limit our discussion to the case of manifolds that are rotationally symmetric and embeddable with codimension one. In this case, we reduce an intrinsic geometric flow to a plane curve evolution. In the specific cases we study, we are able to further simplify the evolution to an evolution of a function of one variable. We provide soliton equations and give proofs that some soliton metrics exist.
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Bevens, Walter Bascom. "Al-Yaman and the Hadramawt: Translations from medieval Arabic geographers and analysis." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184338.
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This dissertation is the result of an interest in the description of al-Yaman and the Hadramawt found in medieval Arabic texts. These texts have never been translated into English to any important degree, and this research represents therefore a pioneer effort. The dissertation begins with an overview, a summary of how medieval Arabic geography began and developed through the influences of Greek, Indian, and Iranian thought to the classical period of Arabic geography and subsequently declined into an age of compilation. This is followed up by a section on the life and works of each author, how the work here translated fits into his career, and how each work relates to the knowledge and information available to that author in his contemporary learned society. The main part of the dissertation deals with the translations themselves. Selections of the important texts are presented to reveal the context of the major geographical themes described. The last major section focuses upon the major themes in the translations. The significance of what information emerges from the texts is analyzed and those elements appearing in each author's work that give it unique importance are discussed.
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Hernández, González Néstor Felipe. "YAMA : a system for marking network traffic." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41607.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 105-108).
Computer security performance analysis requires precise labeling of traffic as either background or attack traffic. When an experiment is performed on-line, it may also be important to identify traffic from the security system. Today this is tedious and difficult, requiring personnel with a deep understanding of multiple protocols. YAMA (Your Able Marking Aide) is a tool that labels sessions and packets associated with a set of user actions given those actions, the traffic, and a network configuration (host information and web page corpus). An evaluation of a version that processes web traffic is performed using data from Alexas Top 100 Sites. YAMA 1.0 correctly associates the action of visiting a specific site with 90% of all HTTP packets, and 99% of both HTTP GET and DNS packets. Furthermore, YAMA 1.0 produces zero false positives when given a high-level event indicating a user visited one web site and packets from a different site.
by Néstor Felipe Hernández González.
M.Eng.
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Santos, Alex Sandro Lopes. "Problema de Yamabe modificado em variedades compactas de dimensão quatro e métricas críticas do funcional curvatura escalar." reponame:Repositório Institucional da UFC, 2017. http://www.repositorio.ufc.br/handle/riufc/22885.
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SANTOS, A. S. L. Problema de Yamabe modificado em variedades compactas de dimensão quatro e métricas críticas do funcional curvatura escalar. 2017. 58 f. Tese (Doutorado em Matemática) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2017.Submitted by Andrea Dantas (pgmat@mat.ufc.br) on 2017-05-25T19:34:47Z No. of bitstreams: 1 2017_tese_aslsantos.pdf: 535461 bytes, checksum: 8c3ddbdd33d74c4eb7b265354b3bafb3 (MD5)
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In the fisrt part of this work we investigate the modified Yamabe problem on four-dimensional manifolds whose the modifiers invariants depending on the eigenvalues of the Weyl curvature tensor and they are described in terms of maximum and minimum of the biorthogonal (sectional) curvature. We provide some geometrical and topological properties on four-dimensional manifolds in terms of these invariants. In the second part we investigate the critical points of the total scalar curvature functional restricted to space of metrics with constant scalar curvature of unitary volume, for simplicity CPE metrics. It was conjectured in the 1980’s that every CPE metric must be Einstein. We prove that such a conjecture is true under a second-order vanishing condition on the Weyl tensor.
Na primeira parte deste trabalho investigamos o problema de Yamabe modificado em variedades de dimensão quatro cujos invariantes modificadores dependem dos autovalores do tensor de Weyl e são descritos em termos do máximo e mínimo da curvatura biortogonal (seccional). Fornecemos algumas propriedades geométricas e topológicas para tais variedades em termos destes invariantes. Na segunda parte investigamos os pontos críticos do funcional curvatura escalar total restrito ao espaço de métricas com curvatura escalar constante e volume unitário, abreviadamente chamamos de métricas CPE. Conjecturou-se na década de 1980 que toda métrica CPE deve ser Einstein. Provamos que tal conjectura é verdadeira sob uma condição de nulidade sobre o divergente de segunda ordem do tensor de Weyl.
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Santos, Almir Rogério Silva. "A construction of constant scalar curvature manifolds with delaunay-type ends." reponame:Repositório Institucional da UFS, 2009. https://ri.ufs.br/handle/riufs/825.
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Foi provado por Byde que é possível adicionar um fim do tipo Delaunay a uma variedade compacta não degenerada de curvatura escalar constante positiva; desde que ela seja localmente conformemente plana em alguma vizinhança do ponto de colagem. A variedade resultante é não-compacta e possui a mesma curvatura escalar constante. O principal objetivo desta tese é generalizar este resultado. Construiremos uma família a um parâmetro de soluções para o problema de Yamabe singular positivo em qualquer variedade compacta não degenerada cujo tensor de Weyl anula-se até uma ordem suficientemente grande no ponto singular. Se a dimensão da variedade é no máximo 5; nenhuma condição sobre o tensor de Weyl é necessária. Usaremos técnicas de pertubação e o método de colagem. _________________________________________________________________________________________ ABSTRACT: It has been showed by Byde [5] that it is possible to attach a Delaunay
type end to a compact nondegenerate manifold of positive constant scalar curvature, provided it is locally conformally flat in a neighborhood of the attaching point. The resulting manifold is noncompact with the same constant scalar curvature. The main goal of this thesis is to generalize
this result. We will construct a one-parameter family of solutions to the
positive singular Yamabe problem for any compact non-degenerate manifold with Weyl tensor vanishing to suciently high order at the singular point. If the dimension is at most 5, no condition on the Weyl tensor is
needed. We will use perturbation techniques and gluing methods.
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Yamba, Edmund Ilimoan [Verfasser], Susanne [Gutachter] Crewell, Andreas H. [Gutachter] Fink, Adrian P. [Gutachter] Tompkins, Bülent [Gutachter] Tezkan, and Volker [Gutachter] Ermert. "Improvement and validation of dynamical malaria models in Africa / Edmund Ilimoan Yamba ; Gutachter: Susanne Crewell, Andreas H. Fink, Adrian P. Tompkins, Bülent Tezkan, Volker Ermert." Köln : Universitäts- und Stadtbibliothek Köln, 2016. http://d-nb.info/1128286645/34.
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Ramirez, Saul Gallegos. "Toward Using Empirical Mode Decomposition to Identify Anomalies in Stream FlowData and Correlations with other Environmental Data." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7574.
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I applied empirical mode decomposition (EMD) and the Hilbert-Herbert transforms, as tools to analyze streamflow data. I used the EMD method to extract and analyze periodic processes and trends in several environmental datasets including daily stream flow, daily precipitation, and daily temperature on data from the watersheds of two rivers in the Upper Colorado River Basin, the Yampa and the Upper-Green rivers. I used these data to identify forcing functions governing streamflow. Forcing functions include environmental factors such as temperature and precipitation and anthropogenic factors such as dams or diversions. The Green and Yampa Rivers have similar headwaters, but the Yampa has minimal diversions or controls while Flaming George Dam on the Green river significantly affects flow. This provides two different flow regimes with similar large watersheds. In addition to flow data, I analyzed several time series data sets, including temperature and precipitation from Northeast Utah, North Western Colorado, and Southern Wyoming. These data are from the area that defines the Yampa River and Green River watersheds, which stretch from Flaming Gorge Dam to Ouray Colorado. The EMD method is a relatively new technique that allows any time series data set, including non-linear and non-stationary datasets that are common in earth observation data, to be decomposed into a small quantity of composite finite data series, called intrinsic mode functions (IMFs). The EMD method can decompose any complicated data into several IMFs that represent independent signals in the original data. These IMFs may represent periodic forcing functions, such as environmental conditions or dam operations, or they may be artifacts of the decomposition method and not have an associated physical meaning. This study attempts to assign physical meaning to some IMFs resulting from the decomposition of the Green and Yampa flows where possible. To assign physical meaning to the IMFs, I analyzed frequencies of each IMF using the Hilbert-Hung transform, part of the Empirical Mode Decomposition method, and then compared frequencies of the IMFs with the known frequencies of physical processes. I performed these calculations on both flow, temperature, and precipitation. I found significant correlation between IMF components of flow, precipitation, and temperature data with El Niño Southern Oscillation (ENSO) events. The EMD process also extracts the long-term trend in non-linear data sets that can provide insights into the effects of climate change on the flow system. Though in preliminary stages of research, these analysis methods may lead to further understanding the availability of water within the upper Yampa and Green River Watersheds.
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Savall, Marc. "Une Architecture d'agents pour la simulation : le modèle YAMAM et sa plate-forme Phoenix." INSA de Rouen, 2003. http://www.theses.fr/2003ISAM0002.
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Cette thèse s'inscrit dans le cadre d'un projet de recherche industriel. Elle présente la modélisation et la conception d'un logiciel orienté agent. Il se base sur un modèle organisationnel qui propose la gestion du cycle de vie d'un ensemble d'entités autonomes, les agents, qui tentent de réaliser des rôles en fonction des compétences qu'ils possèdent. La décomposition de rôles en tâches permet aux agents de n'éxécuter que certaines parties de leurs rôles, en demandant à d'autres agents la réalisation des tâches manquantes par délégation. La particularité de notre modèle repose sur l'utilisation d'un système d'échange d'énergie, véritable moteur engendrant la dynamique et l'auto-organisation du système. Chaque agent oriente ses actions de façon à maximiser son énergie. La contrainte énergétique favorise l'émergence de comportements plus efficaces en éliminant les agents inaptes ou inefficaces. Aux agents normaux, dits réactifs, s'ajoutent les agents cognitifs, plus élaborés, bénéficiant de compétences particulières. Certains agents sont pourvus de facultés d'apprentissage et pourront donc acquérir de nouvelles compétences. L'intérêt du logiciel est de permettre le développement rapide d'applications multi-agents, et de bénéficier de la découpe intuitive et performante des rôles pour autoriser un maximum de modularité, de spécialisation des agents, et d'évolution. Pour résumer, c'est une plate-forme de développement de programmes multi-agents, intégrant les technologies réseau les plus récentes. Ses champs d'application sont la simulation, l'informatique auto-régulée, la supervision, la résolution de problèmes. . . Nous présentons à titre d'exemple la première application industrielle de notre étude : un simulateur pour la formation opérationnelle des officiers de la Sécurité Civile.
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Lachaume, Xavier. "Des équations de contrainte en gravité modifiée : des théories de Lovelock à un nouveau problème de σk-Yamabe." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4018/document.
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Cette thèse est consacrée au problème d’évolution des théories de gravité modifiée : après avoir rappelé ce qu’il en est pour la Relativité Générale (RG), nous exposons le formalisme n + 1 des théories ƒ(R), Brans-Dicke et tenseur-scalaire et redémontrons un résultat connu : le problème de Cauchy est bien posé pour ces théories, et les équations de contrainte se réduisent à celles de la RG avec un champ de matière. Puis nous effectuons la même décomposition n + 1 pour les théories de Lovelock et, ce qui est nouveau, ƒ(Lovelock). Nous étudions ensuite les équations de contrainte des théories de Lovelock et montrons qu’elles sont, dans le cas conformément plat et symétrique en temps, la prescription d’une somme de σk-courbures. Afin de résoudre cette équation de prescription, nous introduisons une nouvelle famille de polynômes semi-symétriques homogènes et développons des résultats de concavité pour ces polynômes. Nous énonçons une conjecture qui, si elle était avérée, nous permettrait de résoudre l’équation de prescription dans de nombreux cas : ∀ P;Q ∈ ℝ[X], avec deg P = deg Q = p, P et Q sont scindés => p ∑ k=0 P(k) Q(p-k) est scindéThis thesis is devoted to the evolution problem for modified gravity theories. After having explained this problem for General Relativity (GR), we present the n + 1 formalism for ƒ(R) theories, Brans-Dicke and scalar-tensor theories. We recall a known result: the Cauchy problem for these theories is well-posed, and the constraint equations are reduced to those of GR with a matter field. Then we proceed to the same n+1 decomposition for Lovelock and ƒ(Lovelock) theories, the latter being an original result. We show that in the locally conformally flat timesymmetric case, they can be written as the prescription of a sum of σk-curvatures. In order to solve the prescription equation, we introduce a new family of homogeneous semisymmetric polynomials and prove some concavity results for those polynomials. We express the following conjecture: if this is true, we are able to solve the prescription equation in many cases. ∀ P;Q ∈ ℝ[X], avec deg P = deg Q = p, P and Q are real-rooted => p ∑ k=0 P(k) Q(p-k) is real-rooted:
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Ribeiro, Yuri Cândido da Silva. "Injetividade global para aplicações entre espaços euclideanos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-18012008-101321/.
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Neste texto é feita uma discussão sobre alguns resultados que fornecem condições suficientes para que um difeomorfismo local, do espaço euclideano n-dimensional nele próprio, seja injetivo. Dentro deste cenário, são exploradas as contribuições destes resultados na tentativa de solucionar conhecidas conjecturas no meio científico como a Conjectura Jacobiana e a Conjectura de Ponto Fixo. Do ponto de vista dinâmico, existem relações entre injetividade global e estabilidade assintótica global. Neste sentido, os resultados também são contextualizados com respeito a importantes conjecturas de estabilidade assintótica: Conjectura de Markus-Yamabe e o Problema de LaSalleWe present some results which give suficient conditions for a local diffeomorphism from the n-dimensional Euclidean space into itself be globally injective. Within this context, we consider some partial results addressed to solve the well known Fixed Point Conjecture and Jacobian Conjecture. From the dynamical point of view, there are connections between global injectivity and global asymptotic stability. In this way, we present a solution of the Markus-Yamabe Conjecture and of the LaSalle Problem
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Kouli, Yaman [Verfasser]. "Wissen und nach-industrielle Produktion : Das Beispiel der gescheiterten Rekonstruktion Niederschlesiens 1936–1956 / Yaman Kouli." Stuttgart : Franz Steiner Verlag, 2014. http://d-nb.info/1075596815/34.
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Daghfous, Radhi. "Le Yaman islāmique des origines jusqu'à l'avènement des dynasties autonomes (Ier-IIIème S./VIIème-IXème S.) /." Tunis : Université de Tunis I, 1995. http://catalogue.bnf.fr/ark:/12148/cb37532607c.
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Haakanson, Sven David. "Ethnoarchaeology of the Yamal Nenets : utilizing emic and etic evidence in the interpretation of archaeological residues /." Ann Arbor (Mich.) : UMI dissertation services, 2000. http://catalogue.bnf.fr/ark:/12148/cb37717292g.
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