Algebraic Rings
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Dynamic Analysis and critical speed of rotating laminated conical shells with orthogonal stiffeners using generalized differential quadrature method
This paper presents effects of boundary conditions and axial loading on frequency characteristics of rotating laminated conical shells with meridional and circumferential stiffeners, i.e., stringers and rings, using Generalized Differential Quadrature Method (GDQM). Hamilton's principle is applied when the stiffeners are treated as discrete elements. The con
Lat. Am. j. solids struct.. Publicado em: 2013-03
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2. Modelo de sistema de comunicações digital para o mecanismo de importação de proteinas mitocondriais atraves de codigos corretores de erros / Digital communication system model for mitochondrial protein import by use of error-correcting codes
One of the puzzling problems in mathematical biology is to show the existence of any form of error-correcting code in the DNA structure. Using information theory considerations we propose a model for the biological coding system similar to that of a digital communication system. This model consists of a mapper (transformations from the set of nucleotides eit
Publicado em: 2010
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3. Sobre a existencia de bases SAGBI finitas para o nucleo de k-derivações em k[x1,...,xn] / About the existence of finite SAGBI bases for the kernel of a k-derivation in k[x1,...,xn]
The general objective of this work is to understand the SAGBI bases theory from a structural point of view, seeking criterias for its existence and results that prove its effitiency in the study of certain subalgebras of k[x], as well as to study the general theory of derivations over polynomial rings, its localizations and quotients, in order to explo
Publicado em: 2008
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4. Elementos rigidos, valorizações e estrutura de aneis de Witt / Rigid elements, valuations and structure of Witt rings
An ordered field is an algebraic structure like the field of real numbers. However, while the field of real numbers have only one ordering, an arbitrary ordered field F may have more than one ordering, and also a infinite and uncountble number of orderings is allowed. To each element x Î F one can associate an binary quadratic form [1, x], called Pfister 1-
Publicado em: 2007
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5. Rigid elements, valuations and structure of Witt rings / Elementos rigidos, valorizações e estrutura de aneis de Witt
An ordered field is an algebraic structure like the field of real numbers. However, while the field of real numbers have only one ordering, an arbitrary ordered field F may have more than one ordering, and also a infinite and uncountble number of orderings is allowed. To each element x Î F one can associate an binary quadratic form [1, x], called Pfister 1-
Publicado em: 2007
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6. On a classification of the integral rings, finite semigroups and RA-loops with the hyperbolic property / Sobre uma classificação dos anéis de inteiros, dos semigrupos finitos e dos RA-loops com a propriedade hiperbólica
For a given division algebra of a quaternion algebra, we construct and define two types of units of its $\Z$-orders: Pell units and Gauss units. Also, for the quadratic imaginary extensions over the racionals and some fixed group $G$, we classify the algebraic integral rings for which the unit group ring is a hyperbolic group. We also classify the finite sem
Publicado em: 2006
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7. O anel dos vetores de Witt e o problema de Waring
In this work we study complete discrete valuation rings. We construct the ring of Witt vectors, denoted by W(A), with components in a commutative ring with unity A. We define W(k), where k is a perfect field of characteristc p, and prove that W(k), defined in this way, is a complete discrete unramified valuation ring. Afterwards, we take k algebraic over Fp
Publicado em: 2006
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8. Propriedades homologicas de mergulho de grupos discretos metabelianos / Embedding homological properties of metabelian discrete groups
We study embedding homological properties of finitely generated metabelian groups and we extend an earlier work in [19] where it was shown that for a fixed m every finitely generated metabelian group G embeds in a quotient of a metabelian group of homological type FPm and furthermore that G embeds in a metabelian group of type FP4. More precisely we show tha
Publicado em: 2006
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9. Algebraic Structure of Linear Dynamical Systems. III. Realization Theory Over a Commutative Ring
The realization theory linear dynamical systems, previously developed over a field, are extended to a large class of commutative rings. The principal result is that the existence criterion for a finite realization extends without modification from a field to a Noetherian integral domain.