Listar Departament: Matemàtiques por fecha de publicación
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Bott Integrable Hamiltonian Systems on S2 x S1
American Institute of Mathematical Sciences (2008)In this paper, we study the topology of Bott integrable Hamiltonian flows on S2 × S1 in terms of some types of periodic orbits, called NMS periodic orbits. The set of these periodic orbits can be identified by means ... -
δ-Sequences and Evaluation Codes de ned by Plane Valuations at Infinity
Oxford University Press (2008)We introduce the concept of δ-sequence. A δ-sequence ∆ generates a well-ordered semigroup S in Z2 or R. We show how to construct (and compute parameters) for the dual code of any evaluation code associated with a weight ...
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Generating sequences and Poincaré series for a finite set of plane divisorial valuations
Elsevier (2008)Let V be a finite set of divisorial valuations centered at a 2- dimensional regular local ring R. In this paper we study its structure by means of the semigroup of values, SV , and the multi-index graded algebra defined ...
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Radon-Nikodým derivatives for vector measures belonging to Köthe function spaces
Elsevier (2008)Let m, n be a couple of vector measures with values on a Banach space. We develop a separation argument which provides a characterization of when the Radon-Nikodým derivative of n with respect to m-in the sense of the ... -
Shape Descriptors for classification of functional data
American Statistical Association (2008)Curve discrimination is an important task in engineering and other sciences. We propose several shape descriptors for classifying functional data, inspired by form anal- ysis from the image analysis eld: statistical ...
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Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement
Springer Verlag (2008)This paper presents an application of Functional Principal Component Analysis (FPCA) to describe inter-subject variability of multiple waveforms. This technique was applied to the study of sit-to-stand movement in two ...
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On potentially negative space time covariances obtained as sum of products of marginal ones
Springer Verlag (2008)Most of the literature on spatio-temporal covariance models proposes structures that are positive in the whole domain. However, problems of physical, biological or medical nature need covariance models allowing for ...
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Totally Lindelöf and totally ω-narrow paratopological groups
Elsevier (2008-01)In many natural objects of topological algebra that possess the algebraic structure of a group, the operations of inversion and multiplication are not necessarily continuous—it suffices to recall the groups of homeomorphisms of ...
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Recent advances to model anisotropic space–time data
Springer-Verlag (2008-05)Building new and flexible classes of nonseparable spatio-temporal covariances and variograms has resulted a key point of research in the last years. The goal of this paper is to present an up-to-date overview of recent ...
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Pseudocompact group topologies with prescribed topological subspaces
International Society for Mathematical Sciences (2009)We prove that every pseudocompact topological Abelian group G admits a pseudocompact topological group topology with a non-trivial convergent sequence. Imposing some restrictions on the properties of G, stronger properties ...
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A method to improve the computation of tidal potential in the equilibrium configuration of a close binary system
Taylor & Francis (2009)A classical problem in celestial mechanics is the study of equilibrium configuration figures of extended deformable bodies. A particularly interesting case of this problem is the study of the figures of equilibrium of close ...
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A new expression for the density of totally geodesic submanifolds in space forms, with stereological applications
Elsevier (2009)Integral section formulae for totally geodesic submanifolds (planes) intersecting a compact submanifold in a space form are available from appropriate representations of the motion invariant density (measure) of these ...
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Self-duality in the class of precompact groups
Elsevier (2009)A topological Abelian group G is called (strongly) self-dual if there exists a topological isomorphism Φ : G → G<sup>∧</sup> of G onto the dual group G<sup>∧</sup> (such that Φ (x) (y) = Φ (y) (x) for all x, y ∈ G). We ...
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Quantifying Uncertainties for Prostate Image-Guided Radiotherapy: A 3D Organ Reconstruction and Registration Method
Bentham Science Publishers (2009)The purpose of this paper is to present a method for volumetric reconstruction, registration and margin assignation applicable to both conventional CT scans and on board CT imaging. This method does not depend on the shape ...
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p-Capacity and p-hyperbolicity of submanifolds
Universidad Autónoma de Madrid. Departamento de Matemáticas (2009)We use explicit solutions to a drifted Laplace equation in warped product model spaces as comparison constructions to show $p$-hyperbolicity of a large class of submanifolds for p>2. The condition for $p$-hyperbolicity is ...
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The Magnus expansion and some of its applications
Elsevier (2009)Approximate resolution of linear systems of differential equations with varying coefficients is a recurrent problem, shared by a number of scientific and engineering areas, ranging from Quantum Mechanics to Control Theory. ...
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Estadística. Volum 1
Universitat Jaume I (2009)
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On unitary representability of topological groups
Springer Verlag (2009)We prove that the additive group (E*, τ k (E)) of an -Banach space E, with the topology τ k (E) of uniform convergence on compact subsets of E, is topologically isomorphic to a subgroup of the unitary group of some Hilbert ...
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Torsional rigidity of submanifolds with controlled geometry
Springer Verlag (2009)We prove explicit upper and lower bounds for the torsional rigidity of extrinsic domains of submanifolds Pm with controlled radial mean curvature in ambient Riemannian manifolds Nn with a pole p and with sectional ...
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Quasi-arithmetic means of covariance functions with potential applications to space-time data
Elsevier (2009)The theory of quasi-arithmetic means represents a powerful tool in the study of covariance functions across space-time. In the present study we use quasi-arithmetic functionals to make inferences about the permissibility ...
