http://hdl.handle.net/2117/3202 Mon, 20 May 2013 19:44:39 GMT 2013-05-20T19:44:39Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/16211 Title: Characterization of accessibility for affine connection control systems at some points with nonzero velocity Authors: Barbero Liñán, María Abstract: Affine connection control systems are mechanical control systems that model a wide range of real systems such as robotic legs, hovercrafts, planar rigid bodies, rolling pennies, snakeboards and so on. In 1997 the accessibility and a particular notion of controllability was intrinsically described by A. D. Lewis and R. Murray at points of zero velocity. Here, we present a novel generalization of the description of accessibility algebra for those systems at some points with nonzero velocity as long as the affine connection restricts to the distribution given by the symmetric closure. The results are used to describe the accessibility algebra of different mechanical control systems Mon, 09 Jul 2012 14:57:53 GMT http://hdl.handle.net/2117/16211 2012-07-09T14:57:53Z Barbero Liñán, María no Affine connection control systems are mechanical control systems that model a wide range of real systems such as robotic legs, hovercrafts, planar rigid bodies, rolling pennies, snakeboards and so on. In 1997 the accessibility and a particular notion of controllability was intrinsically described by A. D. Lewis and R. Murray at points of zero velocity. Here, we present a novel generalization of the description of accessibility algebra for those systems at some points with nonzero velocity as long as the affine connection restricts to the distribution given by the symmetric closure. The results are used to describe the accessibility algebra of different mechanical control systems http://hdl.handle.net/2117/14430 Title: Higher education needs for the information and communication technology spanish market Authors: Llorens García, Ariadna; Llinàs Audet, Francisco Javier; Ras Sabido, Antoni Abstract: Purpose: The main objective of the paper is to clarify the expectations held in the realm of business and by employers, in relation to the main educational parameters that respond to the employment needs of the Information and Communication Technology (ICT) market in Spain, considering both technical and managerial knowledge. It also assesses whether the Spanish Technical University is providing its graduates with the knowledge currently demanded by the sector. Design/methodology/approach: The report is based on a survey completed by 43 companies, which constitutes more than 60% of the sector and is representative of the entire range of subsectors that constitute the vast ICT industry in Spain. According to the sample construction, post-stratification has been used for analyzing global results. Responses have been weighted according to the proportion that represents the employees’ population of the Spanish ICT sector. Findings: As a first conclusion of the current research it should be noted that in terms of technological knowledge, the gap between what the industry requires and the skills graduates can offer is, in general, much smaller than the gap relating to business management skills, where differences exceeding 25% have been demonstrated. This would suggest that the Spanish ICT sector needs to improve learning in the subjects related to business management. Originality/value: Finally, as an innovate factor since there are no previous bibliographic references on this topic, a surprising conclusion is that a significant segment of the Spanish ICT sector, specifically 51,2 % of the companies surveyed, did not distinguish between professional profiles, expressed indifference, and were equally likely to employ graduates as postgraduates. Although when the market was asked about the preferred profile for managerial positions, the results are quite different: 83.7% of respondents preferred a superior engineer qualification; 16.3% Mon, 09 Jan 2012 14:25:04 GMT http://hdl.handle.net/2117/14430 2012-01-09T14:25:04Z Llorens García, Ariadna; Llinàs Audet, Francisco Javier; Ras Sabido, Antoni no Purpose: The main objective of the paper is to clarify the expectations held in the realm of business and by employers, in relation to the main educational parameters that respond to the employment needs of the Information and Communication Technology (ICT) market in Spain, considering both technical and managerial knowledge. It also assesses whether the Spanish Technical University is providing its graduates with the knowledge currently demanded by the sector. Design/methodology/approach: The report is based on a survey completed by 43 companies, which constitutes more than 60% of the sector and is representative of the entire range of subsectors that constitute the vast ICT industry in Spain. According to the sample construction, post-stratification has been used for analyzing global results. Responses have been weighted according to the proportion that represents the employees’ population of the Spanish ICT sector. Findings: As a first conclusion of the current research it should be noted that in terms of technological knowledge, the gap between what the industry requires and the skills graduates can offer is, in general, much smaller than the gap relating to business management skills, where differences exceeding 25% have been demonstrated. This would suggest that the Spanish ICT sector needs to improve learning in the subjects related to business management. Originality/value: Finally, as an innovate factor since there are no previous bibliographic references on this topic, a surprising conclusion is that a significant segment of the Spanish ICT sector, specifically 51,2 % of the companies surveyed, did not distinguish between professional profiles, expressed indifference, and were equally likely to employ graduates as postgraduates. Although when the market was asked about the preferred profile for managerial positions, the results are quite different: 83.7% of respondents preferred a superior engineer qualification; 16.3% http://hdl.handle.net/2117/13984 Title: On a kind of Noether symmetries and conservation laws in k-cosymplectic field theory Authors: Marrero González, Juan Carlos; Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia Abstract: This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian systems in first-order classical field theories. Thus, we introduce a particular class of symmetries and study the problem of associating conservation laws to them by means of a suitable generalization of Noether’s theorem. Mon, 21 Nov 2011 10:52:23 GMT http://hdl.handle.net/2117/13984 2011-11-21T10:52:23Z Marrero González, Juan Carlos; Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia no This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian systems in first-order classical field theories. Thus, we introduce a particular class of symmetries and study the problem of associating conservation laws to them by means of a suitable generalization of Noether’s theorem. http://hdl.handle.net/2117/13693 Title: On the k-symplectic, k-cosymplectic and multisymplectic formalisms of classical field theories Authors: Román Roy, Narciso; Rey, Angel M.; Salgado, Modesto; Vilariño, Silvia Abstract: The objective of this work is twofold: First, we analyze the relation between the k-cosymplectic and the k-symplectic Hamiltonian and Lagrangian formalisms in classical eld theories. In particular, we prove the equivalence between k-symplectic eld theories and the so-called autonomous k-cosymplectic eld theories, extending in this way the description of the symplectic formalism of autonomous systems as a particular case of the cosymplectic formalism in non-autonomous mechanics. Furthermore, we clarify some aspects of the geometric character of the solutions to the Hamilton-de Donder-Weyl and the Euler-Lagrange equations in these formalisms. Second, we study the equivalence between k-cosymplectic and a particular kind of multisymplectic Hamiltonian and Lagrangian eld theories (those where the con guration bundle of the theory is trivial). Thu, 27 Oct 2011 18:04:04 GMT http://hdl.handle.net/2117/13693 2011-10-27T18:04:04Z Román Roy, Narciso; Rey, Angel M.; Salgado, Modesto; Vilariño, Silvia no The objective of this work is twofold: First, we analyze the relation between the k-cosymplectic and the k-symplectic Hamiltonian and Lagrangian formalisms in classical eld theories. In particular, we prove the equivalence between k-symplectic eld theories and the so-called autonomous k-cosymplectic eld theories, extending in this way the description of the symplectic formalism of autonomous systems as a particular case of the cosymplectic formalism in non-autonomous mechanics. Furthermore, we clarify some aspects of the geometric character of the solutions to the Hamilton-de Donder-Weyl and the Euler-Lagrange equations in these formalisms. Second, we study the equivalence between k-cosymplectic and a particular kind of multisymplectic Hamiltonian and Lagrangian eld theories (those where the con guration bundle of the theory is trivial). http://hdl.handle.net/2117/13521 Title: Lagrangian-Hamiltonian unified formalism for autonomous higher order dynamical systems Authors: Prieto Martínez, Pedro Daniel; Román Roy, Narciso Abstract: The Lagrangian-Hamiltonian unified formalism of R. Skinner and R. Rusk was originally stated for autonomous dynamical systems in classical mechanics. It has been generalized for non-autonomous first-order mechanical systems, as well as for first-order and higher-order field theories. However, a complete generalization to higher-order mechanical systems has yet to be described. In this work, after reviewing the natural geometrical setting and the Lagrangian and Hamiltonian formalisms for higher-order autonomous mechanical systems, we develop a complete generalization of the Lagrangian-Hamiltonian unified formalism for these kinds of systems, and we use it to analyze some physical models from this new point of view. Mon, 17 Oct 2011 09:38:13 GMT http://hdl.handle.net/2117/13521 2011-10-17T09:38:13Z Prieto Martínez, Pedro Daniel; Román Roy, Narciso no The Lagrangian-Hamiltonian unified formalism of R. Skinner and R. Rusk was originally stated for autonomous dynamical systems in classical mechanics. It has been generalized for non-autonomous first-order mechanical systems, as well as for first-order and higher-order field theories. However, a complete generalization to higher-order mechanical systems has yet to be described. In this work, after reviewing the natural geometrical setting and the Lagrangian and Hamiltonian formalisms for higher-order autonomous mechanical systems, we develop a complete generalization of the Lagrangian-Hamiltonian unified formalism for these kinds of systems, and we use it to analyze some physical models from this new point of view. http://hdl.handle.net/2117/13114 Title: Lagrangian-Hamiltonian unified formalism for autonomous higher-order dynamical systems Authors: Prieto Martínez, Pedro Daniel; Román Roy, Narciso Abstract: Research paper Thu, 25 Aug 2011 10:35:53 GMT http://hdl.handle.net/2117/13114 2011-08-25T10:35:53Z Prieto Martínez, Pedro Daniel; Román Roy, Narciso no Research paper http://hdl.handle.net/2117/11961 Title: The ICT skills gap in Spain: industry expectations versus university preparation Authors: Llorens García, Ariadna; Llinàs Audet, Francisco Javier; Ras Sabido, Antoni; Chiaramonte Cipolla, Luis Alejandro Abstract: This article distinguishes which generic skills are the key to enable newly graduated engineers, basically computer and telecommunication engineers, to enter the information and communication technology (ICT) sector, satisfying industry demand in Spain. It also demonstrates significant differences between the engineering degrees (at graduate level) and the engineering master degrees (at post-graduate level) related to skills needs. Furthermore, this work establishes the fact that there is a gap between the expectations of the ICT sector and the computer-based engineering curricula and telecommunication engineering curricula the graduated receives, and where this gap appears in relation to generic competences or skills. Fri, 18 Mar 2011 13:55:01 GMT http://hdl.handle.net/2117/11961 2011-03-18T13:55:01Z Llorens García, Ariadna; Llinàs Audet, Francisco Javier; Ras Sabido, Antoni; Chiaramonte Cipolla, Luis Alejandro no computer-based engineering curricula, skills development, information and communication technologies This article distinguishes which generic skills are the key to enable newly graduated engineers, basically computer and telecommunication engineers, to enter the information and communication technology (ICT) sector, satisfying industry demand in Spain. It also demonstrates significant differences between the engineering degrees (at graduate level) and the engineering master degrees (at post-graduate level) related to skills needs. Furthermore, this work establishes the fact that there is a gap between the expectations of the ICT sector and the computer-based engineering curricula and telecommunication engineering curricula the graduated receives, and where this gap appears in relation to generic competences or skills. http://hdl.handle.net/2117/11879 Title: Multisymplectic Lagrangian and Hamiltonian formalisms of classical field theories Authors: Román Roy, Narciso Abstract: This review paper is devoted to presenting the standard multisymplectic formulation for describing geometrically classical field theories, both the regular and singular cases. First, the main features of the Lagrangian formalism are revisited and, second, the Hamiltonian formalism is constructed using Hamiltonian sections. In both cases, the variational principles leading to the Euler–Lagrange and the Hamilton–De Donder–Weyl equations, respectively, are stated, and these field equations are given in different but equivalent geometrical ways in each formalism. Finally, both are unified in a new formulation (which has been developed in the last years), following the original ideas of Rusk and Skinner for mechanical systems. Wed, 16 Mar 2011 13:27:18 GMT http://hdl.handle.net/2117/11879 2011-03-16T13:27:18Z Román Roy, Narciso no This review paper is devoted to presenting the standard multisymplectic formulation for describing geometrically classical field theories, both the regular and singular cases. First, the main features of the Lagrangian formalism are revisited and, second, the Hamiltonian formalism is constructed using Hamiltonian sections. In both cases, the variational principles leading to the Euler–Lagrange and the Hamilton–De Donder–Weyl equations, respectively, are stated, and these field equations are given in different but equivalent geometrical ways in each formalism. Finally, both are unified in a new formulation (which has been developed in the last years), following the original ideas of Rusk and Skinner for mechanical systems. http://hdl.handle.net/2117/11524 Title: Hamilton-Jacobi theory and the evolution operator Authors: Cariñena Marzo, José Fernando; Gràcia Sabaté, Francesc Xavier; Martínez Fernández, Eduardo; Marmo, Giuseppe; Muñoz Lecanda, Miguel Carlos; Román Roy, Narciso Abstract: We present a new setting of the geometric Hamilton-Jacobi theory by using the so-called time-evolution operator K. This new approach unifies both the Lagrangian and the Hamiltonian formulation of the problem developed in [7], and can be applied to the case of singular Lagrangian dynamical systems. Thu, 24 Feb 2011 13:13:13 GMT http://hdl.handle.net/2117/11524 2011-02-24T13:13:13Z Cariñena Marzo, José Fernando; Gràcia Sabaté, Francesc Xavier; Martínez Fernández, Eduardo; Marmo, Giuseppe; Muñoz Lecanda, Miguel Carlos; Román Roy, Narciso no We present a new setting of the geometric Hamilton-Jacobi theory by using the so-called time-evolution operator K. This new approach unifies both the Lagrangian and the Hamiltonian formulation of the problem developed in [7], and can be applied to the case of singular Lagrangian dynamical systems. http://hdl.handle.net/2117/11508 Title: On a kind of Noether symmetries and conservation laws in k-cosymplectic field theory Authors: Marrero González, Juan Carlos; Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia Abstract: This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian systems in first-order classical field theories. Thus, we introduce a particular class of symmetries and study the problem of associating conservation laws to them by means of a suitable generalization of Noether’s theorem. Wed, 23 Feb 2011 13:26:00 GMT http://hdl.handle.net/2117/11508 2011-02-23T13:26:00Z Marrero González, Juan Carlos; Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia no This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian systems in first-order classical field theories. Thus, we introduce a particular class of symmetries and study the problem of associating conservation laws to them by means of a suitable generalization of Noether’s theorem. http://hdl.handle.net/2117/11414 Title: Estudio del horizonte local Authors: Ros Ferré, Rosa Maria Abstract: El estudio del horizonte es fundamental para poder facilitar las primeras observaciones de los alumnos en un centro educativo. Un simple modelo, que debe realizarse para cada centro, nos permite facilitar el estudio y la comprensión de los primeros rudimentos astronómicos. El modelo construido se presenta a su vez como un sencillo modelo de reloj ecuatorial y a partir de él se pueden construir otros modelos (horizontal y vertical). Wed, 16 Feb 2011 15:23:20 GMT http://hdl.handle.net/2117/11414 2011-02-16T15:23:20Z Ros Ferré, Rosa Maria no Horizonte, Reloj ecuatorial El estudio del horizonte es fundamental para poder facilitar las primeras observaciones de los alumnos en un centro educativo. Un simple modelo, que debe realizarse para cada centro, nos permite facilitar el estudio y la comprensión de los primeros rudimentos astronómicos. El modelo construido se presenta a su vez como un sencillo modelo de reloj ecuatorial y a partir de él se pueden construir otros modelos (horizontal y vertical). http://hdl.handle.net/2117/11375 Title: Lie-algebroid formulation of k-cosymplectic classical field theories Authors: Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia Abstract: The k-cosymplectic formalism is the generalization to field theories of the cosymplectic formalism, which is the geometric framework for describing non-autonomous dynamical systems. In [5], A. Weinstein introduced a new geometric framework for giving a more generic description of Lagrangian mechanics. This approach was followed and completed by other authors for studying different kinds of problems concerning mechanical systems (a good survey on this subject is [1]). The extension of this formalism to classical field theories has been made, in [3] for the multisymplectic formalism. This poster, which is based on the developments made in [4], is devoted to presenting a Hamiltonian k-cosymplectic description of field theories in terms of Lie algebroids. Mon, 14 Feb 2011 15:44:59 GMT http://hdl.handle.net/2117/11375 2011-02-14T15:44:59Z Román Roy, Narciso; Salgado, Modesto; Vilariño, Silvia no The k-cosymplectic formalism is the generalization to field theories of the cosymplectic formalism, which is the geometric framework for describing non-autonomous dynamical systems. In [5], A. Weinstein introduced a new geometric framework for giving a more generic description of Lagrangian mechanics. This approach was followed and completed by other authors for studying different kinds of problems concerning mechanical systems (a good survey on this subject is [1]). The extension of this formalism to classical field theories has been made, in [3] for the multisymplectic formalism. This poster, which is based on the developments made in [4], is devoted to presenting a Hamiltonian k-cosymplectic description of field theories in terms of Lie algebroids. http://hdl.handle.net/2117/10479 Title: NASE astronomy courses in South America Authors: Ros Ferré, Rosa Maria Tue, 30 Nov 2010 17:09:51 GMT http://hdl.handle.net/2117/10479 2010-11-30T17:09:51Z Ros Ferré, Rosa Maria no http://hdl.handle.net/2117/7044 Title: Anímate a participar en "Ciencia en Acción" y "Adopta una Estrella" Authors: Ros Ferré, Rosa Maria Wed, 21 Apr 2010 17:12:10 GMT http://hdl.handle.net/2117/7044 2010-04-21T17:12:10Z Ros Ferré, Rosa Maria no http://hdl.handle.net/2117/7043 Title: Un objetivo importante:la astronomía en preescolar y primaria Authors: Ros Ferré, Rosa Maria Wed, 21 Apr 2010 15:45:55 GMT http://hdl.handle.net/2117/7043 2010-04-21T15:45:55Z Ros Ferré, Rosa Maria no