Is there in danger the Comb of the Wind sculpture because of the surge´s force that flogs it? Design of a PBL orientated to the active learning in the formation of Technical Architects

In this communication, the design of a PBL, Problem Based Learning, for the teaching of physical and mechanical properties of materials in the subject of Fundamentals of Materials I for a degree in Technical Arquitecture is presented. This new methodology of teaching orientated to the active learning was implemented in the academic course 2012/13. On the basis of the results obtained in the exams, we can confirm that the methodology is suitable and positive for the acquisition of the results of learning proposed for the subject.En esta comunicación, se presenta el diseño de un ABP, aprendizaje basado en problemas, para la enseñanza de las propiedades físicas y mecánicas de los materiales en la asignatura de Fundamentos de Materiales I del grado de Arquitectura Técnica. Esta nueva metodología de enseñanza orientada al aprendizaje activo se implementó en el curso académico 2012/13, y en base a los resultados obtenidos en los exámenes parciales, se puede confirmar que la metodología resulta adecuada y positiva para la adquisición de los resultados de aprendizaje propuestos para la asignatura

Development of waterborne polyurethane-ureas added with plant extracts: Study of different incorporation routes and their influence on particle size, thermal, mechanical and antibacterial properties

Polyurethane-ureas are a versatile family of polymers which can be employed in a wide range of applications. Among them, waterborne polyurethane-urea (WBPUU) dispersions are gaining relevance in the field of environmentally-friendly products since their productive process adopts green synthesis routes, avoiding the use of organic solvents. Furthermore, their waterborne character can be exploited to incorporate several water compatible ingredients able to confer functional properties to the final materials. Among them, plant extracts, which are known to have relevant bioactivities, can be viewed as interesting candidates. Therefore, in this work, two extracts known to present antimicrobial activity (Melissa officinalis L. and Salvia officinalis L.) were obtained by the infusion method and incorporated into the WBPUU (1, 3 and 5 wt%) following different incorporation routes comprising its adding during different phases of the productive process (post-, in-situ and pre- methods). Thereafter films were prepared by solvent-casting and characterized from the viewpoint of physicochemical, thermal, mechanical, thermomechanical and antibacterial properties and morphologically. The studied incorporation routes resulted in different intercalation mechanisms that varied from extract positioned among the polyurethane-urea nanoparticles (post-method) to extract partially embedded inside them (in-situ and pre-methods), which produced stiffening or flexibilizing effects in the produced films, enhancing in general the antimicrobial characteristics of films after 4 days of incubation comparing with base WBPUU, especially when the extract is embedded.Financial support from the Basque Government (IT-776-13), the Spanish Ministry of Economy and Competitiveness (MINECO) (MAT2016-76294-R), POCI-01-0145-FEDER-006984 (LA LSRE-LCM) funded by ERDF through POCI-COMPETE2020 and FCT and NORTE-01-0145-FEDER-000006, funded by NORTE 2020, under PT2020 through ERDF is gratefully acknowledged. We also wish to acknowledge the “Macrobehaviour- Mesostructure-Nanotechnology” SGIker units from the University of the Basque Country, for their technical support. A.S-E thanks the University of the Basque Country for Ph.D. grant (PIF/UPV/12/201).Financial support from the Basque Government (IT-776-13), the Spanish Ministry of Economy and Competitiveness (MINECO) (MAT2016-76294-R), POCI-01-0145-FEDER-006984 (LA LSRE-LCM) funded by ERDF through POCI-COMPETE2020 and FCT and NORTE- 01-0145-FEDER-000006, funded by NORTE 2020, under PT2020 through ERDF is gratefully acknowledged. We also wish to acknowledge the “Macrobehaviour- Mesostructure-Nanotechnology” SGIker units from the University of the Basque Country, for their technical support. A.S-E thanks the University of the Basque Country for Ph.D. grant (PIF/UPV/12/201).info:eu-repo/semantics/publishedVersio