High pressure effect on optical properties, fluorescence spectra and lifetime τ for 5D0→ 7F2 transition, in L-GdBO3:Eu3+ crystal

This paper presents an experiment on the effects of high hydrostatic pressure on optical properties (the line position) and fluorescence lifetime τ for 5D0 → 7F2 transitions in L-GdBO3: Eu3+ crystals. In all the considered lines of this material, the high pressure induced red-shifts towards longer wavelengths with different rates. Additionally, results show that the fluorescence lifetime τ (5D0 → 7F2 transitions) rapidly decreases with increase of pressure. We have explained the obtained results with a simple theoretical model, which gives a satisfactory agreement between the measured and theoretically predicted values of τ. In addition, the proposed theoretical model gives more accurate results comparing to other models available in the literature

European Conference on Technology Enhanced Learning (10º. 2015. Toledo)

Producción CientíficaVirtual Learning Environments (VLEs) such as Moodle or Sakai are now commonplace in many educational settings, but the limited set of built-in tools (e.g. chats or forums) is often mentioned as a drawback. While successful solutions to integrate Software as a Service (SaaS) tools are reported in the literature (e.g. IMS Basic LTI and GLUE!), there are other non-SaaS tools with potential for education that cannot be integrated in VLEs. These include single-user standalone tools that are run on local computers without a web-based interface (e.g. Matlab), but also virtual machines and laboratories that are common in Computer Science-related disciplines. This paper addresses the integration of these non-SaaS tools in VLEs, proposing an architecture to help teachers to select and configure non-SaaS tools using existing integration approaches from VLEs, but that also relies on cloud infrastructures for provisioning and deploying these tools transparently to the end users.Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14