Search results for " Materiale"
showing 10 items of 139 documents
Nanomateriales basados en lantánidos: caracterización y visualización
2022
Las nanopartículas upconversion (UCNP) comenzaron a desarrollarse a inicios del presente siglo, generando una gran expectación e interés por sus propiedades fotofísicas particulares. Las UCNP son nanomateriales capaces de producir el fenómeno upconversion (UC) mediante el cual fotones de baja energía (de la región del infrarrojo cercano, NIR) se transforman en fotones de alta energía (en la región del UV-vis). Los principales actores del fenómeno son los iones lantánidos que se encuentran como dopantes de una matriz nanométrica transparente. Por tanto, en las UCNP, a diferencia de las nanopartículas (NP) semiconductoras, el confinamiento nanométrico no es el responsable de las propiedades ó…
Il progetto del bianco e la materia dell’architettura
2018
If color is a material that contributes to constructing architecture, white color determines a particular dimension of the project that corresponds to a precise idea of architecture, with specific principles on spatial and form conception, on ways of working with light; in contemporary architecture, white color still refers to ideologies and specific spatial and linguistic research. So it is interesting to understand its values and reasons, to know the products available for this idea, for which traditional technologies are implemented and new applications are developed with innovative expressive effectiveness.
Approccio Metodico alla Riprogettazione di un Semirimorchio
2003
Economic competition leads to continuous development of new products and processes, but it is opposed by the decrease of speed of characteristics improvement and by the consequent tendency of the market to saturation. Redesign assumes in this context a particular remark because it cans allowing the acceleration of process of performances increase. This objective needs a methodical and structured approach that can leading, even, to the modification of product concept. In this work it has been studied the possibility of reducing the mass of a road semitrailer, by intervening on its structural elements. Some solutions, characterized by new topology and/or materials, have been examined and a st…
Análisis de los Materiales Didácticos Digitales para la inclusión y diversidad en Educación Primaria
2021
Tomando como referencia la Declaración de Incheon para la Educación 2030 y su objetivo de una educación inclusiva, esta aportación se centra en examinar la visibilidad de la diversidad social en los recursos audiovisuales que ofrecen dos plataformas educativas: EduCaixa y Tiching. Taking as a reference the Incheon Declaration for Education 2030 and its objective of inclusive education, this contribution focuses on examining the visibility of social diversity in the audiovisual resources offered by two educational platforms: EduCaixa and Tiching. En esta presentación se analizan los productos destinados para la etapa de Educación Primaria como manera de entrar en el tema de la diversidad soc…
La indumentaria como fuente para la didáctica de la historia: problemática y estado de la cuestión
2010
La indumentaria es un objeto de incuestionable valor para la didáctica de la historia y de otras ciencias sociales, ya que posee todas las cualidades de la didáctica del objeto con un atractivo añadido muy vinculado a su aspecto y funcionalidad estética y a su reclamo visual; es fácil vincular períodos históricos con su indumentaria característica, puesto que nuestro imaginario cultural está lleno de películas, pinturas e incluso disfraces que proporcionan datos al respecto. Lo que resulta complicado es dilucidar qué imágenes son las más fidedignas, y esta cuestión no es otra que la relacionada con la veracidad y rigor de las fuentes de la indumentaria. El presente artículo analiza dicha pr…
Correlative study of structural and optical properties of ZnSe under severe plastic deformation
2019
The effect of plastic deformation on the optical and structural properties of ZnSe crystals has been investigated. The optical properties have been monitored by cathodoluminescence measurements as a function of the deformation degree. Remarkable differences in the defect-related emissions from the most severely deformed areas have been encountered. Deformation of the crystal lattice of ZnSe, associated with slip phenomena, has been studied by means of Electron Backscattered Diffraction and micro-Raman spectroscopy. The relation between the deformation and the optical properties of the ZnSe crystals has been described.
Comparative characterization of a novel cad-cam polymer-infiltrated-ceramic-network.
2015
Background The field of dental ceramics for CAD-CAM is enriched with a new innovative material composition having a porous three-dimensional structure of feldspathic ceramic infiltrated with acrylic resins.The aim of this study is to determine the mechanical properties of Polymer-Infiltrated-Ceramic-Network (PICN) and compare its performance with other ceramics and a nano-ceramic resin available for CAD-CAM systems. Material and Methods In this study a total of five different materials for CAD-CAM were investigated. A polymer-infiltrated ceramic (Vita Enamic), a nano-ceramic resin (Lava Ultimate), a feldspathic ceramic (Mark II), a lithium disilicate ceramic (IPS-e max CAD) and finally a Le…
Electrochemical Deposition Mechanism for ZnO Nanorods: Diffusion Coefficient and Growth Models
2011
Fabrication of nanostructured ZnO thin films is a critical process for many applications based on semiconductor devices. So on understanding of the electrochemical deposition mechanism is also fundamental for knowing the optimal conditions on growth of ZnO nanorods by electrodeposition. In this paper the electrochemical mechanism for ZnO nanorods formation is studied. Results are based on the evolution of the diffusion coefficient using the Cotrell equation, and different growth models proposed by Scharifcker and Hills for nucleation and growth.
Forme del tempo
2009
Il Patrimonio della città sostenibile nel Mediterraneo. Progetti sostenibili per il centro storico di Tunisi
2013
Questo contributo si concentra sull’analisi di nuove strategie di rigenerazione urbana che hanno come obiettivo primario la valorizzazione del Patrimonio della città sostenibile nel Mediterraneo. La nostra ipotesi vuole dimostrare che il Patrimonio è diventato il vettore mobilizzatore del cambiamento delle città mediterranee, coinvolgendo mestieri, abitanti e fruitori. Verranno esaminati due progetti realizzati nella città di Tunisi dall’Association de Sauvegarde de la Médina (ASM): l’intervento di valorizzazione di un percorso urbano che collega gli spazi pubblici e il patrimonio architettonico della Medina (2008), dalla Mosquée Zitouna alla Zaouina di Sidi Ibrahim Riahi; il piano di rivit…