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Aproximadamente 29 registro(s) hasta el momento: (journal)

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Recurso libre

Polynomials with all their roots on $S^1$
Ricardo D. Toledano; IMAL-UNL

Formato:	Articles,
Enlaces:	We give a characterization of monic polynomials with coefficients in the ring of integers of a Galois number field having all of their roots on the unit circle. Such a characterization is given in terms of finitely many sum of…
Fecha:	2008-04-09
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

On Besov regularity of temperatures
Hugo A. Aimar; IMAL-CONICET-UNL - Ivana Gómez; IMAL-CONICET-UNL - Bibiana Iaffei; IMAL-CONICET-UNL

Formato:	Articles,
Enlaces:	We prove space-time parabolic Besov regularity in terms of integrability of Besov norms in the space variable for solutions of the heat equation on cylindrical regions based on Lipschitz domains. Accepted: The Journal of Fourier Analysis and Applications. January…
Fecha:	2009-04-08
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

Residuated lattices as algebraic semantics for paraconsistent Nelson logic
Manuela Busaniche; IMAL-CONICET-UNL - Roberto Cignoli

Formato:	Articles,
Enlaces:	The class of NPc-lattices is introduced as a quasivariety of commutative residuated lattices, and it is shown that the class of pairs $(\A, A^+)$ such that $\A$ is an NPc-lattice and $A^+$ is its positive cone, is a matrix semantics…
Fecha:	2009-04-08
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

Equivalence of Haar bases associated to different dyadic systems
Hugo A. Aimar; IMAL-CONICET-UNL - Ana L. Bernardis; IMAL-CONICET-UNL - Luis Nowak; IMAL-CONICET

Formato:	Articles,
Enlaces:	In this note we give sufficient conditions on two dyadic systems on a space of homogeneous type in order to obtain the equivalence of corresponding Haar systems on Lebesgue spaces. The main tool is the vector valued Fefferman-Stein inequality for…
Fecha:	2009-04-08
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

A finite element method for surface diffusion: the parametric case
Pedro Morin; IMAL-CONICET-UNL - Eberhard Bänsch - Ricardo H. Nochetto

Formato:	Articles,
Enlaces:	Abstract: Surface diffusion is a (4th order highly nonlinear) geometric driven motion of a surface with normal velocity proportional to the surface Laplacian of mean curvature. We present a novel variational formulation for parametric surfaces with or without boundaries. The…
Fecha:	2006-08-12
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

Strong coupling strategy for fluid structure interaction problems in supersonic regime via fixed point iteration
Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL - Norberto Marcelo Nigro; CIMEC-INTEC-CONICET-UNL - Rodrigo Rafael Paz; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	In this paper we present some results on the time integration stability when solving fluid/structure interaction problems with strong coupled staged strategies. The flutter of a flat plate faced with a fluid at Mach between 1.8 and 3 is taken…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

Hot-pressing process modeling for medium density fiberboard (MDF)
Norberto Marcelo Nigro; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	In this paper we present a numerical solution for the mathematical modeling of the hot-pressing process applied to medium density fiber- board. The model is based in the work of Humphrey [1982], Humphrey and Bolton [1989] and Carvalho and Costa…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

Convergence rates for adaptive finite elements
Fernando D. Gaspoz; IMAL-CONICET-UNL - Pedro Morin; IMAL-CONICET-UNL

Formato:	Articles,
Enlaces:	In this article we prove that it is possible to construct, using newest-vertex bisection, meshes that equidistribute the error in $H^1$-norm, whenever the function to approximate can be decomposed as a sum of a regular part plus a singular part…
Fecha:	2008-04-09
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

The Mahler measure of linear forms as special values of solutions of algebraic differential equations
Ricardo D. Toledano; IMAL-UNL

Formato:	Articles,
Enlaces:	We prove that for each $n\geq 4$ there is an analytic function $F_n(x)$ satisfying an algebraic differential equation of degree $n+1$ such that the logarithmic Mahler measure of the linear form $\lf_n=x_1+\cdots + x_n$ can be essentially computed as…
Fecha:	2008-04-09
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

10.

Free algebras in varieties of BL-algebras generated by BLn-chains
Manuela Busaniche; IMAL-CONICET-UNL - Roberto Cignoli; UBA - CONICET

Formato:	Articles,
Enlaces:	Free algebras with an arbitrary number of free generators in varieties of BL-algebras generated by one BL-chain which is an ordinal sum of a finite MV-chain ${\bf L}_n$ and a generalized BL-chain ${\bf B}$ are described in terms of weak…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

11.

Spectral duality for finitely generated nilpotent minimum algebras, with applications
S. Aguzzoli - Manuela Busaniche; IMAL-CONICET-UNL - V. Marra

Formato:	Articles,
Enlaces:	We establish a categorical duality for the finitely generated Lindenbaum-Tarski algebras of propositional nilpotent minimum logic. The latter's conjunction is semantically interpreted by a left-continuous (but not continuous) triangular norm; implication is obtained through residuation. Our duality allows one to…
Fecha:	2007-03-06
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

12.

Constructive logic with strong negation as a substructural logic
Manuela Busaniche; IMAL-CONICET-UNL - Roberto Cignoli

Formato:	Articles,
Enlaces:	Spinks and Veroff have shown that constructive logic with strong negation (CLSN for short), can be considered as a substructural logic. We use algebraic tools developed to study substructural logics to investigate some axiomatic extensions of CLSN. For instance we…
Fecha:	2009-04-08
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

13.

Maximal operators, Riesz transforms and Littlewood–Paley functions associated with Bessel operators on BMO
J.J. Betancor; Universidad de la Laguna - Aníbal Chicco Ruiz; IMAL-CONICET - J.C. Fariña; Universidad de la Laguna - L. Rodríguez-Mesa; Universidad de la Laguna

Formato:	Articles,
Enlaces:	In this paper we study boundedness properties of certain harmonic analysis operators (maximal operators for heat and Poisson semigroups, Riesz transform and Littlewood-Paley g-functions) associated with Bessel operators, on the space BMO_o (R) that consists of the odd functions with…
Fecha:	2008-04-09
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

14.

On the efficiency and quality of numerical solutions in CFD problems using the Interface Strip Preconditioner for domain decomposition methods
Rodrigo Rafael Paz; CIMEC-INTEC-CONICET-UNL - Norberto Marcelo Nigro; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	In this paper, the efficiency and the quality of the solutions obtained with a new parallelizable preconditioner for Domain Decomposition Methods (DDM) by means of Finite Element discretization of partial differential equations arising in the context of CFD problems is…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

15.

MPI for Python
Lisandro Daniel Dalcín; CIMEC-INTEC-CONICET-UNL - Rodrigo Rafael Paz; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	MPI for Python provides bindings of the Message Passing Interface (MPI) standard for the Python programming language and allows any Python program to exploit multiple processors. This package is constructed on top of the MPI1 specification and defines an ob…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

16.

An interface strip preconditioner for domain decomposition methods: Application to hydrology
Rodrigo Rafael Paz; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	In this paper, the efficiency of a parallelizable preconditioner for Domain Decomposition Methods in the context of the solution of non-symmetric linear equations arising from discretization of the Saint-Venant equations, is investigated. The proposed Interface Strip Preconditioner (IS) is based…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

17.

Numerical simulations of axisymmetric inertial waves in a rotating sphere by finite elements
Jorge D'Elia; CIMEC-INTEC-CONICET-UNL - Noberto Nigro; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	Axisymmetric inertial waves of a viscous fluid that fill a perturbed rotating spherical container are numerically simulated by finite elements. A laminar flow of an incompressible viscous fluid of Newtonian type is assumed in the numerical simulations. A monolithic computational…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

18.

MPI for Python: Performance Improvements and MPI2 Extensions
Lisandro Daniel Dalcin; INTEC-CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; INTEC-CIMEC-INTEC-CONICET-UNL - Rodrigo Rafael Paz; INTEC-CIMEC-INTEC-CONICET-UNL - Jorge D'Elia; INTEC-CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	MPI for Python provides bindings of the Message Passing Interface (MPI) standard for the Python programming language and allows any Python program to exploit multiple processors. In its first release, MPI for Python was constructed on top of the MPI-1…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

19.

Added mass of an oscillating hemisphere at very-low and very-high frequencies
Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL - Jorge D'Elia; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	A floating hemisphere under forced harmonic oscillation at very-low and very-high frequencies is considered. The problem is reduced to an elliptic one, that is, the Laplace operator in the exterior domain with Dirichlet and Neumann boundary conditions. Asymptotic values of
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

20.

A CVBEM Formulation for Multiple Profiles and Cascades
Jorge D'Elía; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL - Sergio Idelsohn; CIMEC-CONICET-UNL

Formato:	Articles,
Enlaces:	A numerical algorithm based on the Complex Variable Boundary Element Method (CVBEM) for plane incompress- ible potential flow around aerofoils and cascades is described. The method is based on the representation of the complex disturbance velocity by means of a…
Fecha:	2008-04-09
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

21.

Parabolic mean values and maximal estimates for gradients of temperatures
Hugo A. Aimar; IMAL-CONICET-UNL - Ivana Gómez; IMAL-CONICET-UNL - Bibiana Iaffei; IMAL-CONICET-UNL

Formato:	Articles,
Enlaces:	The main result of this paper is a pointwise estimate for the space time gradients of a temperature on a cylindrical domain in terms of an iteration of two maximal operators. The result is an extension to the parabolic setting…
Fecha:	2007-03-06
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

22.

A variational shape optimization approach for image segmentation with a Mumford-Shah functional
Gunay Dogan; University of Pennsylvania - Pedro Morin; IMAL-CONICET-UNL - Ricardo H. Nochetto

Formato:	Articles,
Enlaces:	We introduce a novel computational method for a Mumford-Shah functional, which decomposes a given image into smooth regions separated by closed curves. Casting this as a shape optimization problem, we develop a gradient descent approach at the continuous level that…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

23.

Surface Diffusion of Graphs: Variational Formulation, Error Analysis and Simulation
Eberhard Bänsch - Pedro Morin; IMAL-CONICET-UNL - Ricardo H. Nochetto; University of Maryland

Formato:	Articles,
Enlaces:	Abstract: Surface diffusion is a (4th order highly nonlinear) geometric driven motion of a surface with normal velocity proportional to the surface Laplacian of mean curvature. We present a novel variational formulation for graphs and derive a priori error estimates…
Fecha:	2006-08-12
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

24.

An adaptive Uzawa FEM for the Stokes Problem: Convergence without the inf-sup Condition
Eberhard Bänsch; University of Erlangen - Pedro Morin; IMAL-CONICET-UNL - Ricardo H. Nochetto; University of Maryland

Formato:	Articles,
Enlaces:	We introduce and study an adaptive finite element method for the Stokes system based on an Uzawa outer iteration to update the pressure and an elliptic adaptive inner iteration for velocity. We show linear convergence in terms of the outer…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

25.

Data Oscillation and Convergence of Adaptive FEM
Pedro Morin; IMAL-CONICET-UNL - Ricardo H. Nochetto; University of Maryland - Kunibert G. Siebert; University of Duesburg

Formato:	Articles,
Enlaces:	Data oscillation is intrinsic information missed by the averaging process associated with finite element methods (FEM) regardless of quadrature. Ensuring a reduction rate of data oscillation, together with an error reduction based on a posteriori error estimators, we construct a…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

26.

Sloshing in a Multi-Physics Parallel Programming Paradigm
Laura Battaglia; CIMEC-INTEC-CONICET-UNL - Jorge D'Elía; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL - Norberto Marcelo Nigro; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	In this work, transient free surface flows of a viscous incompressible fluid are numerically solved through parallel computation. Transient free surface flows are boundary-value problems of moving type that involve geometrical non-linearities. In contrast to more conventional CFD problems, the…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

27.

A Minimal Element Distortion Strategy for Computational Mesh Dynamics
Ezequiel López; CIMEC-INTEC-CONICET-UNL - Norberto Marcelo Nigro; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL - Jorge Toth; Universidad Nacional del Comahue

Formato:	Articles,
Enlaces:	Mesh motion strategy is one of the key points in many fluid-structure interaction (FSI) problems. Due to the increasing application of FSI to solve the current challenging engineering problems this topic has deserved a highlight interest. There are several different…
Fecha:	2006-06-24
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

28.

Arbitrary Divergence Speed of the Least-Squares Method in Infinite-Dimensional Inverse Ill-Posed Problems
Ruben D. Spies; Instituto de Matemática Aplicada del Litoral, IMAL, CONICET-UNL - Karina G. Temperini; Instituto de Matemática Aplicada del Litoral, IMAL, CONICET-UNL

Formato:	Articles,
Enlaces:	A standard engineering procedure for approximating the solutions of an infinite-dimensional inverse problem of the form Ax = y, where A is a given compact linear operator on a Hilbert space X and y is the given data, is to…
Fecha:	2010-06-07
Recurso:	Cuadernos de Matemática y Mecánica

Recurso libre

29.

A Preconditioning Mass Matrix to Avoid the Ill-Posed Two-Fluid Model
Angel L. Zanotti; CIMEC-INTEC-CONICET-UNL - Carlos G. Mendez; CIMEC-INTEC-CONICET-UNL - Norberto M. Nigro; CIMEC-INTEC-CONICET-UNL - Mario Alberto Storti; CIMEC-INTEC-CONICET-UNL

Formato:	Articles,
Enlaces:	Two-fluid models are central to the simulation of transport processes in two-phase homogenized systems. Even though this physical model has been widely accepted, an inherently non-hyperbolic and non-conservative ill-posed problem arises from the mathematical point of view. It has been…
Fecha:	2007-03-06
Recurso:	Cuadernos de Matemática y Mecánica