Suchergebnisse

El propósito del presente trabajo es analizar los diferentes flujos de comunicación externos que recibe un Departamento de Educación física dentro de un centro de educación secundaria. Hemos recogido y clasificado todos los envíos de información que desde el exterior de un centro educativo van al Departamento de Educación física, durante un curso escolar. Se han estudiado los contenidos de cada información recibida con el fin de relacionarlos con las distintas competencias que, según la legislación vigente, debe desempeñar el departamento didáctico. El análisis de los remitentes de cada envío arroja información acerca de las diferentes entidades e instituciones que se relacionan con al unidad organizativa encargada del área de Educación física. Por otra parte, las formas de envío de estos flujos informativos pone en evidencia que, a pesar del aumento de los medios informáticos en los centros, éstos no son utilizados. Del análisis de los datos extraemos conclusiones y propuestas de mejora para optimizar la información que podría recibir el Departamento. ; The purpose of this study is to analyze the different flows of external communications which receives a Department of Physical Education of a centre for secondary education. We have collected and classified all orders of information coming from outside a school to the Department of Physical Education during a school year. We have studied the contents of each information received in order to relate them with the different competences that, according to the existing legislation, the didactic department should play. The analysis of the senders provides information about the different entities and institutions that are related with organizational unit responsible for the area of Physical Education. Moreover, the different ways to send these informations reveals that, despite the increase in computer resources in schools, these are not used. After the analysis of data, we came to the conclusions and improving proposals to optimize the information that would receive the Department. ; Sin financiación ; No data 2010

One of the routes to minimize the environmental impact of plastics waste is the use of bio-sourced and biodegradable alternatives, particularly for packaging applications. Although Polyhydroxyalkanoates (PHA) are attractive candidates for food packaging, they have poor processability, particularly for extrusion film blowing. Thus, one relatively successful alternative has been blending PHA with a biodegradable polymer. This work proposes film blowing of a co-extruded Poly (hydroxybutyrate) (PHB) layer with a poly butylene adipate-co-terephtalate (PBAT) layer to enhance bubble stability, mechanical and barrier properties. Co-extrusion is detailed, together with the different strategies followed to improve adhesion between film layers and the PHB content in the films. Films with thicknesses below 50 micron and elongation at break beyond 500 % were consistently produced. ; This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 774088. LH also acknowledges funding from the Portuguese Foundation for Science and Technology Investigator Programme through grant ...

Narrow Band Power Line Communications (NB-PLC) systems are currently used for smart metering and power quality monitoring as a part of the Smart Grid (SG) concept. However, non-intentional emissions generated by the devices connected to the grid may sometimes disturb the communications and isolate metering equipment. Though some research works have been recently developed to characterize these emissions, most of them have been limited to frequencies below 150 kHz and they are mainly focused on in-house electronic appliances and lightning devices. As NB-PLC can also be allocated in higher frequencies up to 500 kHz, there is still a lack of analysis in this frequency range, especially for emissions from Distributed Energy Resources (DERs). The identification and characterization of the emissions is essential to develop solutions that avoid a negative impact on the proper performance of NB-PLC. In this work, the non-intentional emissions of different types of DERs composing a representative microgrid have been measured in the 35–500 kHz frequency range and analyzed both in time and frequency domains. Different working conditions and coupling and commutation procedures to mains are considered in the analysis. Results are then compared to the limits recommended by regulatory bodies for spurious emissions from communication systems in this frequency band, as no specific limits for DERs have been established. Field measurements show clear differences in the characteristics of non-intentional emissions for different devices, working conditions and coupling procedures and for frequencies below and above 150 kHz. Results of this study demonstrate that a further characterization of the potential emissions from the different types of DERs connected to the grid is required in order to guarantee current and future applications based on NB-PLC. ; This work has been financially supported in part by the Basque Government (Elkartek program).