Authoring courses with rich adaptive sequencing for IMS learning design

This paper describes the process of translating an adaptive sequencing strategy designed using Sequencing Graphs to the semantics of IMS Learning Design. The relevance of this contribution is twofold. First, it combines the expressive power and flexibility of Sequencing Graphs, and the interoperability capabilities of IMS. Second, it shows some important limitations of IMS specifications (focusing on Learning Design) for the sequencing of learning activities

Wearing a single DNA molecule with an AFM tip

While the fundamental limit on the resolution achieved in an atomic force microscope (AFM) is clearly related to the tip radius, the fact that the tip can creep and/or wear during an experiment is often ignored. This is mainly due to the difficulty in characterizing the tip, and in particular a lack of reliable methods that can achieve this in situ. Here, we provide an in situ method to characterize the tip radius and monitor tip creep and/or wear and biomolecular sample wear in ambient dynamic AFM. This is achieved by monitoring the dynamics of the cantilever and the critical free amplitude to observe a switch from the attractive to the repulsive regime. The method is exemplified on the mechanically heterogeneous sample of single DNA molecules bound to mica mineral surfaces. Simultaneous monitoring of apparent height and width of single DNA molecules while detecting variations in the tip radius R as small as one nanometer are demonstrated. The yield stress can be readily exceeded for sharp tips (R10nm). The ability to know the AFM tip radius in situ and in real-time opens up the future for quantitative nanoscale materials properties determination at the highest possible spatial resolution.Comment: 26 pages, 6 figure

Design of teacher assistance tools in an exploratory learning environment for algebraic generalisation

The MiGen project is designing and developing an intelligent exploratory environment to support 11-14 year-old students in their learning of algebraic generalisation. Deployed within the classroom, the system also provides tools to assist teachers in monitoring students' activities and progress. This paper describes the architectural design of these Teacher Assistance tools and gives a detailed description of one such tool, focussing in particular on the research challenges faced, and the technologies and approaches chosen to implement the necessary functionalities given the context of the project

Movimientos sociales: ¿Último bastión de la izquierda latinoamericana?

Reseña de: Petras, James y Veltmeyer, Henry (2005), Social Movements and State Power. Argentina, Brazil, Bolivia, Ecuador, Pluto Press, Londre

Creación de una red social para lanzar artistas

Desde la creación de los programas per-to-per, conocidos como PSP, en los que los usuarios funcionan como nodos de forma directa, libre y sin intermediarios el negocio de la industria se ha visto envuelto en una batalla de la cual se ha visto obligado a transformarse. A través de este TFG buscamos la resolución de estos nuevos paradigmas para hacer de estas herramientas un uso positivo de las mismas en detrimento de la piratería.Grado en Publicidad y Relaciones Pública

El vínculo ideacional entre la democracia y el Mercosur

Reseña de: Gardini, Gian Luca, The Origins of Mercosur. Democracy and Regionalization in South America, Ed. Palgrave Macmillan, febrero de 2010