http://hdl.handle.net/2117/3480 Thu, 23 May 2013 05:52:07 GMT 2013-05-23T05:52:07Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18862 Title: Multidisciplinary study of tutoring using virtual characters and second life Authors: Amante García, Beatriz; Campo Sud, David del; Martínez Martínez, María del Rosario Abstract: In this article we present the planning and methodology followed in order to apply virtual tutoring sessions in different subjects and universities. The Second Life environment, together with the Voki speaking avatars will be employed. It is a multidisciplinary study that includes personal and collective tutoring sessions, answering key questions through animated avatars, virtual labs, and posters exhibition for peer-evaluation. From a survey run among the students it is concluded that most of them are willing to learn and try this kind of tutoring sessions, but at the same time some feel skeptical about its utility Thu, 18 Apr 2013 10:23:24 GMT http://hdl.handle.net/2117/18862 2013-04-18T10:23:24Z Amante García, Beatriz; Campo Sud, David del; Martínez Martínez, María del Rosario no In this article we present the planning and methodology followed in order to apply virtual tutoring sessions in different subjects and universities. The Second Life environment, together with the Voki speaking avatars will be employed. It is a multidisciplinary study that includes personal and collective tutoring sessions, answering key questions through animated avatars, virtual labs, and posters exhibition for peer-evaluation. From a survey run among the students it is concluded that most of them are willing to learn and try this kind of tutoring sessions, but at the same time some feel skeptical about its utility http://hdl.handle.net/2117/18377 Title: A complete analysis of axial piston pump leakage and output flow ripples Authors: Bergadà Granyó, Josep Maria; Kumar, Sushil; Davies, Dyfyr Ll.; Watton, John Mon, 18 Mar 2013 16:32:36 GMT http://hdl.handle.net/2117/18377 2013-03-18T16:32:36Z Bergadà Granyó, Josep Maria; Kumar, Sushil; Davies, Dyfyr Ll.; Watton, John no http://hdl.handle.net/2117/18376 Title: The effect of oil pressure and temperature on barrel film thickness and barrel dynamics of an axial piston pump Authors: Bergadà Granyó, Josep Maria; Davies, Dyfyr Ll.; Kumar, Sushil; Watton, John Mon, 18 Mar 2013 16:28:19 GMT http://hdl.handle.net/2117/18376 2013-03-18T16:28:19Z Bergadà Granyó, Josep Maria; Davies, Dyfyr Ll.; Kumar, Sushil; Watton, John no http://hdl.handle.net/2117/18375 Title: Axial piston pumps, new trends and development Authors: Bergadà Granyó, Josep Maria; Kumar, Sushil; Watton, John Mon, 18 Mar 2013 16:11:48 GMT http://hdl.handle.net/2117/18375 2013-03-18T16:11:48Z Bergadà Granyó, Josep Maria; Kumar, Sushil; Watton, John no http://hdl.handle.net/2117/18370 Title: The effect of piston grooves performance in an axial piston pumps via CFD analysis Authors: Kumar, Sushil; Bergadà Granyó, Josep Maria Mon, 18 Mar 2013 14:29:00 GMT http://hdl.handle.net/2117/18370 2013-03-18T14:29:00Z Kumar, Sushil; Bergadà Granyó, Josep Maria no http://hdl.handle.net/2117/18358 Title: A numerical simulation of fluid-structure interaction for flow through valves of a hermetic compressor with immersed boundary method Authors: Mushyam, Aditya; Bergadà Granyó, Josep Maria Fri, 15 Mar 2013 16:53:47 GMT http://hdl.handle.net/2117/18358 2013-03-15T16:53:47Z Mushyam, Aditya; Bergadà Granyó, Josep Maria no http://hdl.handle.net/2117/18182 Title: Aprendizaje de finanzas con la ayuda de vídeos docentes Authors: Rajadell Carreras, Manuel; Garriga Garzón, Federico Abstract: Este trabajo presenta la experiencia de la elaboración de tres videos docentes relativos al análisis financiero mediante ratios, análisis dinámico, y teoría de rentas, dirigidos a estudiantes de ingeniería. Se expone la manera cómo se han realizado los vídeos docentes y los resultados de su utilización en el aula a partir de las opiniones o valoraciones de los estudiantes. Este tipo de material que se plantea como complementario al tradicional (libros, apuntes y diapositivas), ofrece una gran flexibilidad a los estudiantes, sin ningún coste adicional para ellos. Los esfuerzos dedicados a la elaboración de este tipo de material deberían ser valorados por parte de los evaluadores de la actividad docente ya que contribuyen a la mejora de la formación de los estudiantes y por tanto de los futuros profesionales. Al mismo tiempo, parece necesario plantear cursos de formación al profesorado con la finalidad de que puedan introducirse en la realización de este tipo de materiales. Mon, 11 Mar 2013 16:37:10 GMT http://hdl.handle.net/2117/18182 2013-03-11T16:37:10Z Rajadell Carreras, Manuel; Garriga Garzón, Federico no Este trabajo presenta la experiencia de la elaboración de tres videos docentes relativos al análisis financiero mediante ratios, análisis dinámico, y teoría de rentas, dirigidos a estudiantes de ingeniería. Se expone la manera cómo se han realizado los vídeos docentes y los resultados de su utilización en el aula a partir de las opiniones o valoraciones de los estudiantes. Este tipo de material que se plantea como complementario al tradicional (libros, apuntes y diapositivas), ofrece una gran flexibilidad a los estudiantes, sin ningún coste adicional para ellos. Los esfuerzos dedicados a la elaboración de este tipo de material deberían ser valorados por parte de los evaluadores de la actividad docente ya que contribuyen a la mejora de la formación de los estudiantes y por tanto de los futuros profesionales. Al mismo tiempo, parece necesario plantear cursos de formación al profesorado con la finalidad de que puedan introducirse en la realización de este tipo de materiales. http://hdl.handle.net/2117/18004 Title: Problemas resueltos de teoría de la decisión Authors: Garriga Garzón, Federico Description: El presente libro de problemas resueltos de teoría de la decisión no pretende ser una aportación científica al campo de la teoría de la decisión pues todos los conceptos que en él se incorporan están recogidos en excelentes publicaciones sobre el tema. La finalidad de esta publicación es exclusivamente didáctica, y únicamente se justifica por razones pedagógicas. Ha sido concebido para su utilización por personas con conocimientos de teoría de la decisión y estadística, con la finalidad de facilitar el aprendizaje de los procedimientos de formulación y resolución de problemas de análisis de decisiones, a los estudiantes de dicha materia en las diversas Facultades, Escuelas Técnicas, y Escuelas de Negocios en las que se imparte. El libro no presenta ninguna estructura predeterminada, los ejercicios no están agrupados siguiendo un criterio predefinido, sino que se concilian ejercicios sencillos con ejercicios complejos con el ánimo de hacer más ameno el estudio, incrementando así el interés por el análisis de los problemas de decisión. Los ejercicios que integran el libro se fundamentan en de la resolución de los problemas de toma de decisiones primordialmente mediante el uso de árboles de decisión, siendo el enfoque expuesto marcadamente práctico. La publicación no es exclusivamente un libro de ejercicios resueltos de teoría de la decisión para estudiantes, sino una metodología que facilite la toma de decisiones a los directivos así como a toda aquella persona que en algún momento de su vida deba tomar una decisión. Por ello, resulta de enorme interés tanto para estudiantes como para directivos, así como para cualquier persona que a lo largo de su vida requerirá tomar decisiones que afectarán el transcurso de la misma. Wed, 27 Feb 2013 11:49:08 GMT http://hdl.handle.net/2117/18004 2013-02-27T11:49:08Z Garriga Garzón, Federico no http://hdl.handle.net/2117/17685 Title: Extracurricular learning program for professional skills development in engineering schools Authors: González Díez, David; Griful Ponsati, Eulàlia; Mudarra López, Miguel; Serrano Maestre, Maria del Pilar Abstract: This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly addressed to facilitate cross-curricular skills and abilities development among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is given as well Tue, 12 Feb 2013 17:45:16 GMT http://hdl.handle.net/2117/17685 2013-02-12T17:45:16Z González Díez, David; Griful Ponsati, Eulàlia; Mudarra López, Miguel; Serrano Maestre, Maria del Pilar no This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly addressed to facilitate cross-curricular skills and abilities development among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is given as well http://hdl.handle.net/2117/16718 Title: Principios para el análisis de la evacuación de edificios mediante redes dinámicas de flujo Authors: Casadesús Pursals, Salvador; Garriga Garzón, Federico Abstract: Para el estudio del problema de la evacuación de edificios se ha recurrido a diferentes disciplinas y a diferentes tipos de modelos. Asimismo, entre los modelos matemáticos utilizados existen numerosas posibilidades. En este trabajo se estudia la evacuación de edificios mediante redes dinámicas de flujo, que corresponden a una solución determinista en un entorno discreto. Con este modelo se dispone de la evolución de las magnitudes que caracterizan el problema en intervalos regulares de tiempo, obteniendo un conocimiento preciso y fiable del desarrollo de la evacuación, y siendo posible, además, la obtención de soluciones óptimas, las propuestas que són capaces de determinar las condiciones que minimizan tiempos de evacuación y maximizan flujos de salida. Thu, 11 Oct 2012 13:15:32 GMT http://hdl.handle.net/2117/16718 2012-10-11T13:15:32Z Casadesús Pursals, Salvador; Garriga Garzón, Federico no Para el estudio del problema de la evacuación de edificios se ha recurrido a diferentes disciplinas y a diferentes tipos de modelos. Asimismo, entre los modelos matemáticos utilizados existen numerosas posibilidades. En este trabajo se estudia la evacuación de edificios mediante redes dinámicas de flujo, que corresponden a una solución determinista en un entorno discreto. Con este modelo se dispone de la evolución de las magnitudes que caracterizan el problema en intervalos regulares de tiempo, obteniendo un conocimiento preciso y fiable del desarrollo de la evacuación, y siendo posible, además, la obtención de soluciones óptimas, las propuestas que són capaces de determinar las condiciones que minimizan tiempos de evacuación y maximizan flujos de salida. http://hdl.handle.net/2117/16204 Title: Optimal low-thrust transfers between libration point orbits Authors: Ren, Yuan; Pergola, Pierpaolo; Fantino, Elena; Thiere, B. Abstract: Over the past three decades, ballistic and impulsive trajectories between libration point orbits (LPOs) in the Sun–Earth–Moon system have been investigated to a large extent. It is known that coupling invariant manifolds of LPOs of two different circular restricted three-body problems (i.e., the Sun–Earth and the Earth–Moon systems) can lead to significant mass savings in specific transfers, such as from a low Earth orbit to the Moon’s vicinity. Previous investigations on this issuemainly considered the use of impulsive maneuvers along the trajectory. Here we investigate the dynamical effects of replacing impulsive V’s with low-thrust trajectory arcs to connect LPOs using invariant manifold dynamics. Our investigation shows that the use of low-thrust propulsion in a particular phase of the transfer and the adoption of a more realistic Sun–Earth–Moon four-body model can provide better and more propellant-efficient solution. For this purpose, methods have been developed to compute the invariant tori and their manifolds in this dynamical model Mon, 09 Jul 2012 10:55:30 GMT http://hdl.handle.net/2117/16204 2012-07-09T10:55:30Z Ren, Yuan; Pergola, Pierpaolo; Fantino, Elena; Thiere, B. no Over the past three decades, ballistic and impulsive trajectories between libration point orbits (LPOs) in the Sun–Earth–Moon system have been investigated to a large extent. It is known that coupling invariant manifolds of LPOs of two different circular restricted three-body problems (i.e., the Sun–Earth and the Earth–Moon systems) can lead to significant mass savings in specific transfers, such as from a low Earth orbit to the Moon’s vicinity. Previous investigations on this issuemainly considered the use of impulsive maneuvers along the trajectory. Here we investigate the dynamical effects of replacing impulsive V’s with low-thrust trajectory arcs to connect LPOs using invariant manifold dynamics. Our investigation shows that the use of low-thrust propulsion in a particular phase of the transfer and the adoption of a more realistic Sun–Earth–Moon four-body model can provide better and more propellant-efficient solution. For this purpose, methods have been developed to compute the invariant tori and their manifolds in this dynamical model http://hdl.handle.net/2117/15287 Title: Successes and challenges of a Collaborative-PBL Program in Engineering Degrees Authors: González Díez, David; Font Andreu, Jorge; Salán Ballesteros, Maria Núria; García-Almiñana, Daniel; Ortiz Marzo, José Antonio; Mudarra López, Miguel; Griful Ponsati, Eulàlia Abstract: This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d’Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly aimed at facilitating cross-curricular skills and developing abilities among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. The main feature of this program is that the subjects of the projects are proposed by the students themselves. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is also given. Tue, 21 Feb 2012 14:51:25 GMT http://hdl.handle.net/2117/15287 2012-02-21T14:51:25Z González Díez, David; Font Andreu, Jorge; Salán Ballesteros, Maria Núria; García-Almiñana, Daniel; Ortiz Marzo, José Antonio; Mudarra López, Miguel; Griful Ponsati, Eulàlia no This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d’Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly aimed at facilitating cross-curricular skills and developing abilities among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. The main feature of this program is that the subjects of the projects are proposed by the students themselves. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is also given. http://hdl.handle.net/2117/13762 Title: A numerical investigation of wind tunnel model deformations caused by the twin-sting support system Authors: Flores Le Roux, Roberto Maurice; Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio Mon, 07 Nov 2011 19:18:12 GMT http://hdl.handle.net/2117/13762 2011-11-07T19:18:12Z Flores Le Roux, Roberto Maurice; Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio no http://hdl.handle.net/2117/13459 Title: Star visibility and tracking from the Space Station Authors: Bernacca, Pier Luigi; Facchinetti, Claudia; Fantino, Elena Abstract: Purpose of the present study is to provide algorithms for and examples of how to simulate star visibility and tracking by a Telescope attached to the main truss of the International Space Station (ISS). The sky visibility of a Telescope is limited by accommodation constraints on the truss, by obstructions caused by Station’s structural elements along with other payloads, by Sun and Moon’s light and by ram atomic Oxygen. It is also limited by Station’s orbit and attitude. The above limiting agents have been modeled vis-a-vis NASA nominal specifications and knowledge of the ambient environment. These models have been used to write algorithms and to produce examples of visibility and tracking at single star level. The above analysis has been used to describe in detail how to simulate star visibility and tracking of an observing program all over the sky by a plausible wide field Telescope operated only during successive 80 days coast periods in the declination’s range −71° to 71°. Simulation is mandatory in advance of real observations. The analysis rests on the feasibility study, funded by the Italian Space Agency (ASI), of a Telescope designed for accommodation on ISS. The present visibility and tracking study enables observations planning and it is introductory to any engineering algorithm devoted to mechanically drive pointing and tracking of celestial targets from the Space Station. Since question might arise whether ISS-based Astronomy is nowadays scientifically worthwhile, a brief summary of the science rationale in Ultraviolet, useful to Astrophysics and Cosmology, is offered to the curious Astrophysicist who can decide on his own. From an operational point of view it is concluded that an observing programme can be carried out provided photon re-centering techniques are applied to the raw data, in order to free them from the effects of ISS vibrations. Fri, 07 Oct 2011 18:50:45 GMT http://hdl.handle.net/2117/13459 2011-10-07T18:50:45Z Bernacca, Pier Luigi; Facchinetti, Claudia; Fantino, Elena no Purpose of the present study is to provide algorithms for and examples of how to simulate star visibility and tracking by a Telescope attached to the main truss of the International Space Station (ISS). The sky visibility of a Telescope is limited by accommodation constraints on the truss, by obstructions caused by Station’s structural elements along with other payloads, by Sun and Moon’s light and by ram atomic Oxygen. It is also limited by Station’s orbit and attitude. The above limiting agents have been modeled vis-a-vis NASA nominal specifications and knowledge of the ambient environment. These models have been used to write algorithms and to produce examples of visibility and tracking at single star level. The above analysis has been used to describe in detail how to simulate star visibility and tracking of an observing program all over the sky by a plausible wide field Telescope operated only during successive 80 days coast periods in the declination’s range −71° to 71°. Simulation is mandatory in advance of real observations. The analysis rests on the feasibility study, funded by the Italian Space Agency (ASI), of a Telescope designed for accommodation on ISS. The present visibility and tracking study enables observations planning and it is introductory to any engineering algorithm devoted to mechanically drive pointing and tracking of celestial targets from the Space Station. Since question might arise whether ISS-based Astronomy is nowadays scientifically worthwhile, a brief summary of the science rationale in Ultraviolet, useful to Astrophysics and Cosmology, is offered to the curious Astrophysicist who can decide on his own. From an operational point of view it is concluded that an observing programme can be carried out provided photon re-centering techniques are applied to the raw data, in order to free them from the effects of ISS vibrations. http://hdl.handle.net/2117/13030 Title: Two mechanisms of natural transport in the Solar System Authors: Ren, Yuan; Gomez Muntaner, Gerard; Masdemont Soler, Josep; Fantino, Elena Abstract: In this paper, two natural transport mechanisms in Solar System are considered. The first is a short-time transport, and is based on the existence of ‘‘pseudo-heteroclinic’’ connections between libration point orbits of pairs of Sun–planet planar circular restricted three-body problems (PCR3BP). The stable and unstable manifolds associated with the libration point orbits of different Sun–planet PCR3BP systems are computed. Then the intersections between the inner and the outer manifolds of all the consecutive planets in the Solar System are explored. The second mechanism, which is common and qualitatively well understood in two-degrees of freedom Hamiltonian systems, corresponds to a long-time transport, and is the result of the strongly chaotic motion of the minor body in the PCR3BP. In this contribution, we present an analysis of the natural transport in the Solar System based on these two mechanisms. In particular, we discuss the key properties of the natural transport, such as the possibility of transfering between two specified celestial bodies, the type of transport and the time of flight. The final objective is to provide a deeper dynamical insight into the exchange mechanisms of natural material in the Solar System. Mon, 25 Jul 2011 07:57:26 GMT http://hdl.handle.net/2117/13030 2011-07-25T07:57:26Z Ren, Yuan; Gomez Muntaner, Gerard; Masdemont Soler, Josep; Fantino, Elena no In this paper, two natural transport mechanisms in Solar System are considered. The first is a short-time transport, and is based on the existence of ‘‘pseudo-heteroclinic’’ connections between libration point orbits of pairs of Sun–planet planar circular restricted three-body problems (PCR3BP). The stable and unstable manifolds associated with the libration point orbits of different Sun–planet PCR3BP systems are computed. Then the intersections between the inner and the outer manifolds of all the consecutive planets in the Solar System are explored. The second mechanism, which is common and qualitatively well understood in two-degrees of freedom Hamiltonian systems, corresponds to a long-time transport, and is the result of the strongly chaotic motion of the minor body in the PCR3BP. In this contribution, we present an analysis of the natural transport in the Solar System based on these two mechanisms. In particular, we discuss the key properties of the natural transport, such as the possibility of transfering between two specified celestial bodies, the type of transport and the time of flight. The final objective is to provide a deeper dynamical insight into the exchange mechanisms of natural material in the Solar System.