Search results for "Seguridad"
showing 10 items of 280 documents
La Europa social / 1. El modelo europeo de sociedad
2005
Ciudad y sociedad
1992
Vulnerables y Culpables
2000
Por una Europa política, social y ecológica
2004
El Crimen global
2000
A pesar de todo
1998
Influence of substrate and temperature on the biodegradation of polyester-based materials: Polylactide and poly(3-hydroxybutyrate-co-3-hydroxyhexanoa…
2020
[EN] The extended use of polymers from renewable resources such as aliphatic polyesters or polyhydroxyalkanoates boosted the necessity to understand their behaviour in an end-of-life scenario. Although they can be degraded in reasonable shorter times than traditional polymers, understanding the degradation mechanisms under dissimilar conditions will contribute to further developments in this field. This work aimed to study the effect of temperature and substrate in the degradation of polylactide (PLA) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) in a simulated laboratory scale to ascertain their contribution, separately or in combination. For this purpose, nine parallel degradat…
Poly (lactic acid)/D-limonene/ZnO bio-nanocomposites with antimicrobial properties
2022
[EN] Antimicrobial films of poly (lactic acid) (PLA)/D-limonene/zinc oxide (ZnO)-based bio-nanocomposites were prepared via melt compounding and subsequent thermocompression. D-limonene was incorporated at concentrations of 10 or 20 wt%, and ZnO pure nanoparticles and those organically modified with oleic acid (O-ZnO), with an average diameter of 13.5 nm, were included at concentrations of 3, 5, and 8 wt%. The plasticizing effect of D-Limonene was corroborated by a decrease in the glass transition temperature compared to pure PLA. The presence of ZnO and O-ZnO in the PLA matrix promoted a slight increase in the degree of crystallinity due to its nucleant performance. Although ZnO and O-ZnO …
Ciudadanía digital y uso responsable de las tecnologías. Propuestas pedagógicas en centros de educación secundaria obligatoria.
2015
Los jóvenes en edad escolar son quienes utilizan en mayor proporción los aparatos tecnológicos. En un informe del Centro Reina Sofía se da a conocer un estudio sobre hábitos de uso y seguridad de Internet de menores y jóvenes en España. En él se destaca el constante crecimiento del uso de Internet entre los adolescentes. Junto a la preocupación por los efectos desfavorables debido a un ‘uso no responsable’ de las tecnologías, emergen investigaciones focalizadas en los riesgos manifestados. El propósito de nuestro trabajo es el estudio de propuestas de intervención en centros de educación secundaria para el buen uso y el posterior diseño de un material de fácil acceso y adaptable al criterio…