Search results for "CN"
showing 10 items of 9699 documents
Artichoke fibres as potential reinforcement of composite materials: mechanical and thermal characterization
2011
Effect of water absorption on thermal and mechanical properties of thermosetting resins for marine applications
2009
Evaluation of web reinforcements in prestressed concrete box girders through shear-transverse bending domains
2020
In concrete box girders, the amount and distribution of reinforcements in the webs have to be estimated considering the local effects due to eccentric external loads and cross-sectional distortion and not only the global effect due to the resultant forces of a longitudinal analysis: shear, torsion and bending. This work presents an analytical model that allows designers to take into account the interaction of all these effects, global and local, for the determination of the reinforcements. The model is based on the theory of stress fields and it has been compared to a 3D finite element analysis, in order to validate the interaction domains. The results show how the proposed analytical mode…
MODIFICATION OF HYDROPHOBIC SURFACE WITH POLYASPARTAMIDE-BASED POLYCATIONS FOR BIOMEDICAL APPLICATION
2013
A convenient way for the achievement of polymer-based solid materials for specific biomedical applications is grafting the appropriate macromolecules onto the surfaces in order to confer them specific properties. To date many approaches have been used to covalently modify polymeric surfaces, and among them chemoselective coupling reactions, usually referred as “click” reactions, gained much attention thanks to simple procedure with high reaction rate under mild reaction conditions (at normal temperature and pressure) [1]. In particular, radical-initiated thiol-yne “photo-click” chemistry has been demonstrated as an effective way to functionalize efficiently surfaces. This method gives also …
Red list of threatened vascular plants in Italy
2021
Italy has a rich natural heritage, which is dangerously under pressure. In recent years, there is an increased awareness of the crucial role of plants in ecosystem functioning and in providing ecosystem services. Consequently, an updated Red List of the Italian vascular flora was compiled in this work, at the request of the Ministry for Environment, Land and Sea Protection, with the scientific support of the Italian Botanical Society. The IUCN Red List criteria were applied to 2,430 Italian native vascular plant taxa to assess their current extinction risk and to highlight the major threats affecting the Italian flora. Our results revealed that 54 taxa (2.2% of the assessed taxa) are extinc…
Taxa a rischio nella flora vascolare della Sicilia
2011
Biogeographia vol. XgO( - 2011 (Pubblicato il 23 dicembre 2011) La Biogeografia de/Ia Sicilia Taxa a rischio nella flora vascolare della Sicilia FRANCESCO MARIA RAIMONDO, GIUSEPPE BAZAN, ANGELO TROIA Dzjzartimento di Biologia Ambientale e Biodiversitd, Universird di Palermo via Arc/aimfi 38, 90123 Palermo (Italy) Key words: threatened species, vascular flora, red list, Sicily. SUMMARY An analysis was made to update the regional red list of endangered vascular plants in Sicily which, with 3,252 taxa (including a noteworthy number of endemic species), is one of the richest areas in the Mediterranean region. Considering previous regional and national red lists, recent taxonomic and floristic lite…
Verifying the predicted risk of extinction based on ecological characteristics
2021
Red List status of species should reflect species extinction risk. Because data are limited and species response has a time lag, species may be threatened by extinction even if they are not Red‐Listed. The ability to predict species risk of extinction from ecological characteristics holds promises for proactively targeting conservation measures to species at high risk. In 2005, the risk of extinction from ecological characteristics was predicted for 81 species of Finnish butterflies. Now, after 15 years and two additional national Red List assessments, these predictions are verified. Species with a higher risk of extinction according to the original ecological extinction risk rank (EERR) ha…
Testing and Modeling of Hybrid Steel-Trussed Concrete Beams in Shear
2014
Buenas prácticas en la continuidad TIC de las organizaciones
2022
Los Sistemas de Gestión de la Continuidad del Negocio (SGCN) se han convertido en uno de los objetivos prioritarios para las organizaciones, principalmente por la globalización y exigencia de sus clientes o usuarios. Es frecuente la aparición en los medios de comunicación algunas noticias relacionadas con el impacto que ha causado en los negocios la interrupción de su actividad, originado a partir de incidentes de seguridad en sus sistemas de información. Se han visto afectadas en sus operaciones organizaciones tanto de índole pública como privada. Las empresas deben de disponer de un SGCN diseñado e implantado correctamente que garantice que en un tiempo estimado puedan reanudar sus operac…
Análisis de la autopercepción en base al modelo tpack en los futuros y las futuras docentes de educación primaria
2020
El avance de las tecnologías digitales está haciendo que los procesos de enseñanza-aprendizaje se vean modificados ante la necesidad de incorporar las TIC en la labor docente. En esta circunstancia, la formación inicial se torna indispensable de cara a una implementación que tenga en cuenta todos los aspectos que interfieren en el proceso educativo. Para ello, modelos que tengan en cuenta las diferentes dimensiones conceptuales, pedagógicas y tecnológicas pueden ayudar en una óptima inserción de la tecnología digital en la escuela. Por ello, esta investigación de carácter descriptivo analiza las autopercepciones en base al modelo TPACK (Technological Pedagogical Content Knowledge) de un tot…