Search results for "visual"
showing 10 items of 7386 documents
Inorganic Mercury Sequestration by a Poly(ethylene imine) Dendrimer in Aqueous Solution
2015
The interaction of the G-2 poly(ethylene imine) dendrimer L, derived from ammonia as initiating core, with Hg(II) and HgCl4 2− was studied in aqueous solution by means of potentiometric (pH-metric) measurements. Speciation of these complex systems showed that L is able to form a wide variety of complexes including 1:1, 2:1, 3:1 and 3:2 metal-to-ligand species, of different protonation states, as well as the anion complexes ((H7L)HgCl4) 5+ and ((H8L)HgCl4) 6+ . The stability of the metal complexes is very high, making L an excellent sequestering agent for Hg(II), over a large pH range, and a promising ligand for the preparation of functionalized activated carbons to be employed in the remedi…
Enhancing geometrical knowledge, metacognitive reasoning and visual spatial skills through a playing chess laboratory.
2012
Sulphate removal over barium-modified blast-furnace-slag geopolymer
2016
Blast-furnace slag and metakaolin were geopolymerised, modified with barium or treated with a combination of these methods in order to obtain an efficient SO4(2-) sorbent for mine water treatment. Of prepared materials, barium-modified blast-furnace slag geopolymer (Ba-BFS-GP) exhibited the highest SO4(2-) maximum sorption capacity (up to 119mgg(-1)) and it compared also favourably to materials reported in the literature. Therefore, Ba-BFS-GP was selected for further studies and the factors affecting to the sorption efficiency were assessed. Several isotherms were applied to describe the experimental results of Ba-BFS-GP and the Sips model showed the best fit. Kinetic studies showed that th…
Phosphorus-Chalcogen Ring Expansion and Metal Coordination
2017
The reactivity of 4-membered (RPCh)2 rings (Ch = S, Se) that contain phosphorus in the +3 oxidation state is reported. These compounds undergo ring expansion to (RPCh)3 with the addition of a Lewis base. The 6-membered rings were found to be more stable than the 4-membered precursors, and the mechanism of their formation was investigated experimentally and by density functional theory calculations. The computational work identified two plausible mechanisms involving a phosphinidene chalcogenide intermediate, either as a free species or stabilized by a suitable base. Both the 4- and 6-membered rings were found to react with coinage metals, giving the same products: (RPCh)3 rings bound to the…
Decomposition Process of Carboxylate MOF HKUST-1 Unveiled at the Atomic Scale Level
2016
HKUST-1 is a metal-organic framework (MOF) which plays a significant role both in applicative and basic fields of research, thanks to its outstanding properties of adsorption and catalysis but also because it is a reference material for the study of many general properties of MOFs. Its metallic group comprises a pair of Cu2+ ions chelated by four carboxylate bridges, forming a structure known as paddle-wheel unit, which is the heart of the material. However, previous studies have well established that the paddle-wheel is incline to hydrolysis. In fact, the prolonged exposure of the material to moisture promotes the hydrolysis of Cu-O bonds in the paddle-wheels, so breaking the crystalline n…
From 1D coordination polymers to Metal Organic Frameworks by the use of 2-pyridyl oximes.
2020
The synthesis and characterization of coordination polymers and metal&ndash
Nuevas aportaciones sobre el taller de los Tosquella (1368-1446), imagineros mallorquines
2022
Este artículo se centra en el estudio de uno de los talleres de la escultura en madera más destacados del Gótico en Mallorca, los Tosquella, activos entre 1368 y 1446. Tras un análisis de la documentación que nos permite conocer las vertientes laboral y social de estos escultores, el texto se orienta hacia su vertiente productiva. A partir del análisis del retablo gótico de la Seu, se propone la atribución de un conjunto de obras de imaginería conservadas en la isla, a saber, un grupo de seis Crucificados y tres esculturas marianas.
Journalisme numérique: théorie, méthodologie et critères d'analyse
2007
Comunicación presentada en el congreso de la International Association for Media & Communication Research (IAMCR) at UNESCO, Paris, 23-25 Juillet 2007. Dans cette communication, nous proposons une approche théorique et méthodologique pour l'analyse des contenus numériques. D'une part, nous établissons quelle est la typologie -et les critères qui vont la définir- de ces contenus et types cyberjournalistiques : (1) leur nature : (a) interactifs, (b) de communication interpersonnelle, (c) de participation des Communautés et (e) accès à l’information ; et (2) leur condition stratégique : (a) adaptés (versions d'autres formats existants, comme webs pour PDA), (b) d'anticipation (ex. alertes), (c…
Rethinking visual art practice in relation to well-being : a conceptual analysis
2015
This study examines how the concepts related to visual art practice and well-being have been used in the arts and academic sectors. Furthermore, it studies whether it is possible to create a new theoretical and conceptual framework for research. The research material of the arts and academic sectors was examined by the methods of critical review and conceptual analysis. The conceptual analysis led to the following main results: The employment of the concepts concerning the practice of visual arts was diverse, often overlapping, and in some respects incoherent. Both the concepts of ‘art’ and ‘well-being’ were mostly used as reasoning with generalizations. This strategy of discourse was conce…
El arquitecto y académico Cristóbal Sales Gutiérrez (1763-1833) al servicio de la ciudad de Valencia y sucesores en el cargo hasta 1860
2023
El presente trabajo analiza fundamentalmente la intensa trayectoria del arquitecto y académico Cristóbal Sales Gutiérrez en la ciudad de Valencia durante su larga etapa como primer arquitecto de su Consistorio. Precisamente el edificio sede de esta institución es objeto de especial estudio bajo su dirección, así como de los casi treinta años posteriores a la muerte de Sales hasta resolverse la demolición de su señera fábrica. El estudio se completa con aportaciones biográficas, tales como su enlace matrimonial y su testamento.