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Search Results: 1 - 10 of 34700 matches for " Pedro Mazzocco Pereira "
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MORFOANATOMIA DE Ricinus communis L. (Euphorbiaceae) EXPOSTAS A ESTRESSE SALINO
Marilaine Alves de Oliveira,Ivana Menezes Silva de Barros,Pedro Mazzocco Pereira,Wendel Mattos Pompilho
Perspectivas Online : Biológicas e Saúde , 2012,
Abstract: A mamoneira é uma planta da família Euphorbiacea e encontra-se amplamente distribuída em todo oterritório brasileiro, onde se adaptou com grande facilidade. Sua capacidade de adapta o a variadascondi es e sua resistência ao déficit hídrico, permitem seu desenvolvimento em solos pouco férteis e emcondi es adversas para a maior parte das plantas. Sua cultura é considerada bastante rústica, no entanto, ésensível às características físicas e químicas do solo como granulometria, pH e presen a de sais. Nestecontexto, o objetivo desse trabalho foi caracterizar as altera es morfoanat micas apresentadas por plantasde Ricinus communis L., cultivar Mirante 10, expostas a estresse salino. Para tanto, as sementes foram postaspara germinar em dois substratos, areia e terra, contendo diferentes concentra es de sal. Os parametrosavaliados foram o comprimento das plantulas, percentual de matéria seca, área foliar e densidade estomática.Os dados anat micos foram obtidos através de cortes à m o livre de caule, folha e raiz, clarificados,observados e fotografados em microscópio óptico com camera digital acoplada. Os resultados mostraram queas plantas de Ricinus communis L. respondem de forma diferenciada aos níveis salinos e substratos, comrespostas mais fortes encontradas nas mudan as anat micas, principalmente nos tecidos radiculares. Os doissubstratos testados influenciaram diretamente na emergência e estabelecimento destas plantas à condi o desalinidade do solo.
Uma história de Dolia : uma primeira análise aos recipientes ceramicos de armazenagem de Vale do Mouro (Coriscada, Meda)
Pedro Pereira
CEM : Cultura, Espa?o & Memória , 2011,
Abstract: The dolium or vase, as it is commonly called in our days, is in all probability on of most prevalent typesof pottery in the history of ceramics in Portugal. It is also one of the least studied types at national level.The history of Roman ceramics in Portugal has essentially focused on high-quality, imported pottery, such asthe sigillatae or amphorae, or on local productions representative of a certain area, such as the fine greypottery. The dolia are usually considered in a class on their own. The remains found are often not studied, evenwhen the archaeological digs yield a significant amount of these objects.This article results from a more extended study we have been developing, on the dolium type pieces of potteryfound in the Douro valley and Beira Interior region, in archaeological settings dating from the 2nd to the 4thcenturies. The work of Tony Silvino and Guillaume Mazza on the production structure of the dolia in Rumansil(Mós do Douro, Vila Nova de Foz C a) is here taken as a starting point of analysis.In this paper, we present the preliminary results of the analysis of dolia fragments found at the town of Valedo Mouro, (Coriscada, Mêda), excavated between 2003 and 2010, which enabled the systematic survey andstudy of this type of pottery.
The geometry of the classical solutions of the Garnier systems
Marta Mazzocco
Physics , 2001,
Abstract: Our aim is to find a general approach to the theory of classical solutions of the Garnier system in $n$-variables, ${\cal G}_n$, based on the Riemann-Hilbert problem and on the geometry of the space of isomonodromy deformations. Our approach consists in determining the monodromy data of the corresponding Fuchsian system that guarantee to have a classical solution of the Garnier system ${\cal G}_n$. This leads to the idea of the reductions of the Garnier systems. We prove that if a solution of the Garnier system ${\cal G}_{n}$ is such that the associated Fuchsian system has $l$ monodromy matrices equal to $\pm\ID$, then it can be reduced classically to a solution of a the Garnier system with $n-l$ variables ${\cal G}_{n-l}$. When $n$ monodromy matrices are equal to $\pm\ID$, we have classical solutions of ${\cal G}_n$. We give also another mechanism to produce classical solutions: we show that the solutions of the Garnier systems having reducible monodromy groups can be reduced to the classical solutions found by Okamoto and Kimura in terms of Lauricella hypergeometric functions. In the case of the Garnier system in 1-variables, i.e. for the Painlev\'e VI equation, we prove that all classical non-algebraic solutions have either reducible monodromy groups or at least one monodromy matrix equal to $\pm\ID$.
Rational Solutions of the Painleve' VI Equation
M. Mazzocco
Physics , 2000, DOI: 10.1088/0305-4470/34/11/320
Abstract: In this paper, we classify all values of the parameters $\alpha$, $\beta$, $\gamma$ and $\delta$ of the Painlev\'e VI equation such that there are rational solutions. We give a formula for them up to the birational canonical transformations and the symmetries of the Painlev\'e VI equation.
Non-Symmetric Basic Hypergeometric Polynomials and Representation Theory for Confluent Cherednik Algebras
Marta Mazzocco
Physics , 2014, DOI: 10.3842/SIGMA.2014.116
Abstract: In this paper we introduce a basic representation for the confluent Cherednik algebras $\mathcal H_{\rm V}$, $\mathcal H_{\rm III}$, $\mathcal H_{\rm III}^{D_7}$ and $\mathcal H_{\rm III}^{D_8}$ defined in arXiv:1307.6140. To prove faithfulness of this basic representation, we introduce the non-symmetric versions of the continuous dual $q$-Hahn, Al-Salam-Chihara, continuous big $q$-Hermite and continuous $q$-Hermite polynomials.
Confluences of the Painleve equations, Cherednik algebras and q-Askey scheme
Marta Mazzocco
Physics , 2013,
Abstract: In this paper we produce seven new algebras as confluences of the Cherednik algebra of type \check{C_1}C_1 and we characterise their spherical-sub-algebras. The limit of the spherical sub-algebra of the Cherednik algebra of type \check{C_1}C_1 is the monodromy manifold of the Painlev\'e VI equation. Here we prove that by considering the limits of the spherical sub-algebras of our new confluent algebras, one obtains the monodromy manifolds of all other Painlev\'e differential equations. Moreover, we introduce confluent versions of the Zhedanov algebra and prove that each of them (quotiented by their Casimir) is isomorphic to the corresponding spherical sub-algebra of our new confluent Cherednik algebras. We show that in the basic representation our confluent Zhedanov algebras act as symmetries of certain elements of the q-Askey scheme, thus setting a stepping stone towards the solution of the open problem of finding the corresponding quantum algebra for each element of the q-Askey scheme. These results establish a new link between the theory of the Painlev\'e equations and the theory of the q-Askey scheme and shed light on the reasons behind the occurrence of special polynomials in the Painlev\'e theory.
Irregular isomonodromic deformations for Garnier systems and Okamoto's canonical transformations
M. Mazzocco
Physics , 2003,
Abstract: In this paper we describe the Garnier systems as isomonodromic deformation equations of a linear system with a simple pole at zero and a Poincar\'e rank two singularity at infinity. We discuss the extension of Okamoto's birational canonical transformations to the Garnier systems in more than one variable and to the Schlesinger systems.
Picard and Chazy solutions to the Painleve' VI equation
M. Mazzocco
Mathematics , 1999,
Abstract: I study the solutions of a particular family of Painlev\'e VI equations with the parameters $\beta=\gamma=0, \delta=1/2$ and $2\alpha=(2\mu-1)^2$, for $2\mu\in\interi$. I show that the case of half-integer $\mu$ is integrable and that the solutions are of two types: the so-called Picard solutions and the so-called Chazy solutions. I give explicit formulae for them and completely determine their asymptotic behaviour near the singular points $0,1,\infty$ and their nonlinear monodromy. I study the structure of analytic continuation of the solutions to the PVI$\mu$ equation for any $\mu$ such that $2\mu\in\interi$. As an application, I classify all the algebraic solutions. For $\mu$ half-integer, I show that they are in one to one correspondence with regular polygons or star-polygons in the plane. For $\mu$ integer, I show that all algebraic solutions belong to a one-parameter family of rational solutions.
Corpo, sexo e subvers?o: reflex?es sobre duas teóricas queer
Pereira, Pedro Paulo Gomes;
Interface - Comunica??o, Saúde, Educa??o , 2008, DOI: 10.1590/S1414-32832008000300004
Abstract: the aim of this text is to present two important queer theoreticians, beatriz preciado and marie-hélène bourcier. after outlining their work and highlighting their definitions of sex and gender, i discuss the centrality of the body in the general economy of their works. i conclude by posing some questions, in which i emphasize the urgency of inquiring into the various vectors of differences that result from inequalities and exclusions.
O sert?o dilacerado: outras histórias de Deus e o Diabo na terra do sol
Pereira, Pedro Paulo Gomes;
Lua Nova: Revista de Cultura e Política , 2008, DOI: 10.1590/S0102-64452008000200002
Abstract: this article tries to understand how one of the most important narratives of the national cinema - glauber rocha's black god, white devil (1963) - has constructed the sert?o (hinterland), which images and figures he has employed, and how that hinterland delineates and projects the country.
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