DIALNET OAI Articles
(192.244 recursos)
DIALNET es una hemeroteca virtual, integradora de recursos y capaz de ofrecer servicios documentales y alertas informativas a sus usuarios. Sus principales objetivos son:
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Mostrando recursos 1 - 20 de 8.156
1.
The geometry of abstract groups and their splittings - Wall, Charles Terence Clegg
A survey of splitting theorems for abstract groups and their applications. Topics covered include preliminaries, early results, Bass-Serre theory, the structure of G-trees, Serre's applications to SL2 and length functions. Stallings' theorem, results about accessibility and bounds for splittability. Duality groups and pairs; results of Eckmann and collaborators on PD2 groups. Relative ends, the JSJ theorems and the splitting results of Kropholler and Roller on PDn groups. Notions of quasi-isometry, of hyperbolic group, and of its boundary. We recall that convergence groups on the circle are Fuchsian, and survey results relating properties of the action of a hyperbolic group on...
2.
Algorithms for the computation of muduli spaces for semiquasihomogeneous singularities - Bayer, Thomas
We present algorithms and their implementation in the computer algebra system Singular 2.0 for the computation of equations for moduli spaces for semiquasihomogeneous singularities w.r.t. right equivalence. In addition, we describe the structure of the stabilizer group of Brieskorn-Pham singularities.
3.
Topologie des fonctions régulières et cycles évanescents - Brélivet, Thomas
One has two notions of vanishing cycles: the Deligne's general notion and a concrete one used recently in the study of polynomial functions. We compare these two notions which gives us in particular a relative connectivity result. We finish with an example of vanishing cycle calculation which shows the difficulty of a good choice of compactification.
4.
Identifiability, stability and reconstruction results of point sources by boundary measurements in heteregeneous trees - Nicaise, Serge; Zaïr, Ouahiba
One has two notions of vanishing cycles: the Deligne's general notion and a concrete one used recently in the study of polynomial functions. We compare these two notions which gives us in particular a relative connectivity result. We finish with an example of vanishing cycle calculation which shows the difficulty of a good choice of compactification.
5.
Small vertical vibrations of strings with moving ends - Nunes Rabello, Tania; Campos Vieira, María Cristina; Lopes Frota, Cicero; Adauto Medeiros, Luis
In this work we investigate a mathematical model for small vertical vibrations of a stretched string when the ends vary with the time t and the cross sections of the string is variable and the density of the material is also variable, that is, r=r(x). It contains Kirchhoff model for fixed ends. We obtain solutions by Galerkin method and estimates in Sobolev spaces.
6.
Long-time dynamics of an integro-differential equation describing the evolution of a spherical flame - Rouzaud, Hélène
This article is devoted to the study of a flame ball model, derived by G. Joulin, which satisfies a singular integro-differential equation. We prove that, when radiative heat losses are too important, the flame always quenches; when heat losses are smaller, it stabilizes or quenches, depending on an energy input parameter. We also examine the asymptotics of the radius for these different regimes.
7.
Reaction-diffusion-convection problems in unboundeed cylinders - Texier Picard, Rozenn; Volpert, Vitaly A.
This article is devoted to the study of a flame ball model, derived by G. Joulin, which satisfies a singular integro-differential equation. We prove that, when radiative heat losses are too important, the flame always quenches; when heat losses are smaller, it stabilizes or quenches, depending on an energy input parameter. We also examine the asymptotics of the radius for these different regimes.
8.
A survey on wavelet methods for (geo) applications - Freeden, Willi; Maier, Thorsten; Zimmermann, Steffen
Wavelets originated in 1980's for the analysis of (seismic) signals and have seen an explosion of applications. However, almost all the material is based on wavelets over Euclidean spaces. This paper deals with an approach to the theory and algorithmic aspects of wavelets in a general separable Hilbert space framework. As examples Legendre wavelets on the interval [-1,+1] and scalar and vector spherical wavelets on the unit sphere W are discussed in more detail.
9.
Classifying finite-sheeted covering mappings of paracompact spaces - Matijevic, Vlasta
The main result of the present paper is a classification theorem for finite-sheeted covering mappings over connected paracompact spaces. This theorem is a generalization of the classical classification theorem for covering mappings over a connected locally pathwise connected semi-locally 1-connected space in the finite-sheeted case. To achieve the result we use the classification theorem for overlay structures which was recently proved by S. Mardesic and V. Matijevic (Theorems 1 and 4 of [5]).
10.
Uncountably many wild knots whose cyclic branched covering are S3 - Montesinos Amilibia, José María
There is a disk in S3 whose interior is PL embedded and whose boundary has a tame Cantor set of locally wild points, such that the n-fold cyclic coverings of S3 branched over the boundary of the disk are all S3. An uncountable set of inequivalent wild knots with these properties is exhibited.
11.
A survey on continuous elliptical vector distributions - Gómez, Eusebio; Gómez Villegas, Miguel A.; Marín, J. Miguel
In this paper it is taken up a revision and characterization of the class of absolutely continuous elliptical distributions upon a parameterization based on the density function. Their properties (probabilistic characteristics, affine transformations, marginal and conditional distributions and regression) are shown in a practical and easy to interpret way. Two examples are fully undertaken: the multivariate double exponential distribution and the multivariate uniform distribution.
12.
Citoquinesis en células eucariotas - Pardo, Mercedes
En la citoquinesis, etapa final del ciclo celular, se forma una barrera que separará el material genético recién dividido en dos células hijas.
13.
Translational averaging for completeness, characterization and oversampling of wavelets - Laugesen, Richard S.
The single underlying method of averaging the wavelet functional over translates yields first a new completeness criterion for orthonormal wavelet systems, and then a unified treatment of known results on characterization of wavelets on the Fourier transform side, on preservation of frame bounds by oversampling, and on equivalence of affine and quasiaffine frames. The method applies to multiwavelet systems in all dimensions, to dilation matrices that are in some cases not expanding, and to dual frame pairs.
15.
Arithmetically Gorenstein curves on arithmetically Cohen-Macaulay surfaces - Dolcetti, Alberto
Let Sigma C PN be a smooth connected arithmetically Cohen-Macaulay surface. Then there are at most finitely many complete linear systems on Sigma, not of the type |kH - K| (H hyperplane section and K canonical divisor on Sigma), containing arithmetically Gorenstein curves.
19.
Singular functions on metric measure spaces - Holopainen, I.; Shanmugalingam, Nageswari
On relatively compact domains in metric measure spaces we construct singular functions that play the role of Green functions of the p-Laplacian. We give a characterization of metric spaces that support a global version of such singular function, in terms of capacity estimates at infinity of such metric spaces. In addition, when the measure of the space is locally Q-regular, we study quasiconformal invariance property associated with the existence of global singular functions.
20.
Una revisión de los métodos de remuestreo en series temporales - Alonso, Andrés M.; Romo, Juan J.; Peña Sánchez de Rivera, Daniel
Desde Efron y Tibshirani (1986), se han propuesto varios métodos de remuestreo para datos temporales. En este artículo, presentamos los principales métodos de remuestreo desarrollados para series temporales, centrándonos en el jackknife por bloques móviles, el bootstrap por bloques móviles, y en el bootstrap para modelos autorregresivos, y proponemos nuevas alternativas para los métodos de remuestreo basados en bloques de observaciones.
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