Ara es mostren els items 1-19 de 19

• #### An ellipsoidal billiard with a quadratic potential ﻿

(2003)
Article
Accés obert
There exists an in infite hierarchy of integrable generalizations of the geodesic flow on an n -di- mensional ellipsoid.hese generalizations describe the motion of a point in the force fields of certain polynomial potentials.In ...
• #### Closed Geodesics and Billiards on Quadrics related to elliptic KdV solutions ﻿

(2004)
Article
Accés obert
We consider algebraic geometrical properties of the integrable billiard on a quadric Q with elastic impacts along another quadric confocal to Q. These properties are in sharp contrast with those of the ellipsoidal Birkho® ...
• #### Compact Hausdorff group topologies for the additive group of real numbers ﻿

Capítol de llibre
Accés obert
This volume contains the contributions presented by several colleagues as a tribute to the mathematical and human qualities of Jos e Mar a Montesinos Amilibia on the occasion of his seventieth birthday. The editors would ...
• #### Estimation of dispersion curves by combining effective elastic constants and SAFE method: a case study in a plate under stress ﻿

(Institute of Physics (IOP), 2017)
Article
Accés obert
This paper presents an approach to calculate dispersion curves for homogeneous and isotropic plates subject to stress, via Semi-Analytical Finite Element and the Effective Elastic Constants, since stresses in the waveguide ...
• #### Extension of maps defined on many fibres ﻿

(1997)
Article
Accés obert
Let S be a fibred surface. We prove that the existence of morphisms from non countably many fibres to curves implies, up to base change, the existence of a rational map from S to another surface fibred over the same base ...
• #### Local geometry of analytic planar morphisms ﻿

(Universitat Politècnica de Catalunya, 2017-07)
Projecte Final de Màster Oficial
Accés obert
This work focuses in the study of local geometry of analytic planar morphisms. First, we introduce the basic concepts that will be needed to present the main part of the work. Secondly, we study the effect of analytic ...
• #### Moduli spaces and formal operads ﻿

(2003)
Article
Accés obert
Let Mg,l be the moduli space of stable algebraic curves of genus g with l marked points. With the operations which relate the different moduli spaces identifying marked points, the family (Mg,l)g,l is a modular operad ...
• #### Multiplier ideals of plane curves ﻿

(Universitat Politècnica de Catalunya, 2012-10)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autor
Multiplier ideals and their corresponding jumping numbers have been revealed as a fundamental tool to measure the singularity of plane curves. There are approaches to these objects from both Commutative Algebra and Algebraic ...
• #### On the slope of bielliptic fibrations ﻿

(1997)
Article
Accés obert
Let $\pi :S\longrightarrow B$ be a bielliptic fibration. We prove $S$ is, up to base change, a rational double cover of an elliptic fibration and that $\pi$ is isotrivial provided it is smooth. Finally, we prove that the ...

(1998)
Article
Accés obert
• #### On the Torelli problem and Jacobian Nullwerte in genus three ﻿

(2008)
Article
Accés obert
We give a closed formula for recovering a non-hyperelliptic genus three curve from its period matrix, and derive some identities between Jacobian Nullwerte in dimension three.
• #### Optimizations in the computation of pairings and cryptographic applications ﻿

(Universitat Politècnica de Catalunya, 2013-07)
Projecte Final de Màster Oficial
Accés obert
En la criptografía de clave pública actual el uso de curvas elípticas es cada vez más habitual debido a que ofrecen una seguridad similar a los ya utilizados cuerpos finitos, pero con unas claves más cortas. Por otra parte, ...
• #### Proper generalized decomposition solutions within a domain decomposition strategy ﻿

(John Wiley & sons, 2018-03-30)
Article
Accés restringit per política de l'editorial
Domain Decomposition strategies and the Proper Generalized Decomposition are efficiently combined to obtain a fast evaluation of the solution approximation in parameterized elliptic problems with complex geometries. The ...
• #### Rational parametrization of Q-curves: Sage implementatio ﻿

(Universitat Politècnica de Catalunya, 2013-09)
Treball Final de Grau
Accés obert
En aquest treball donarem una parametrització d'un tipus especial de corbes algebràiques anomenades "Q-corbes". Primer farem una introducció per familiartizar al lector amb conceptes bàsics i resultats previs, i després ...
• #### Sato-Tate distributions and Galois endomorphism modules in genus 2 ﻿

(2012)
Article
Accés restringit per política de l'editorial
For an abelian surface A over a number eld k, we study the limit- ing distribution of the normalized Euler factors of the L-function of A. This distribution is expected to correspond to taking characteristic poly- nomials ...
• #### Synthesis of displacement functions by Bézier curves in constant-breadth cams with parallel flat-faced translating and oscillating followers ﻿

(2013-04)
Article
Accés restringit per política de l'editorial
The constant-breadth cam mechanisms, which drive a parallel flat-faced double follower, are desmodromic, and guarantee global bilaterality. In the said mechanisms, the law of displacement of the follower can only be freely ...

(1997)
Article
Accés obert
• #### Tipus de reduccions de corbes ﻿

(Publicacions i Edicions de la Universitat de Barcelona (UB), 2008-01-31)
Capítol de llibre
Accés obert
• #### Torcimiento de cuárticas planas lisas ﻿

(Universitat Politècnica de Catalunya, 2010-10)
Projecte Final de Màster Oficial
Accés obert
En este trabajo se determinan los twists de las cuárticas planas lisas, es decir, de las curvas lisas no hiperelípticas de género 3. Se parte de una clasificación de Henn de las cuárticas planas y sus grupos de automorfismos ...