Search results for " TECNOLOGIE"
showing 10 items of 1308 documents
Titania Photocatalysts for Selective Oxidations in Water
2011
Heterogeneous photocatalysis by polycrystalline semiconductor oxides is an unconventional technology that has been mainly applied for the degradation of organic and inorganic pollutants in both the vapor and liquid phase. The application of photocatalysis in synthetic routes has also been researched in recent years, demonstrating its viability as an alternative route in organic chemistry. This work illustrates the main findings in the application of heterogeneous photocatalysis to the oxidation of organic compounds dissolved in water, free of any organic co-solvent. Two main aspects of the oxidative process have been studied: the first one is the partial oxidation of various mono-substitute…
Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies
2014
The present work has investigated the fracture toughness of a model DGEBA epoxy system subject to Hidro-Thermal aging. A Photoelastic Stress Analysis technique has been implemented, showing the evolution of stresses arising throughout the water uptake process due to the non-uniform swelling of the material. Gravimetric and Dynamic Mechanical Thermal Analyses have further complemented the characterization, showing the onset of plasticization effects with aging. The correlation of all previous characterizations has allowed to conclude that an increase of KIC fracture toughness is obtained at the fully saturated condition. In particular Photoelasticity has also revealed the onset of relevant s…
Interlaminar fracture toughness behavior of electron-beam cured carbon-fiber reinforced epoxy-resin composites
2013
The work describes the preparation and physical-mechanical characterization of unidirectional CFRP panels manufactured by an electron beam curing technique. Delamination fracture toughness in Mode I and II is investigated in order to evaluate the influence of fiber–matrix adhesion strength, matrix toughness and matrix crosslinking density as determined by the radiation curing process. A matrix system comprising a DGEBA epoxy monomer and an initiator of cationic polymerization have been used, with one batch of resin mixed with a PES monomer in order to enhance matrix toughness. Curing was achieved with a pulsed 10 MeV Electron Beam accelerator. Thermally cured composite systems have also bee…
FILIERA DELLA CONOSCENZA, INNOVAZIONE ED IMPRENDITORIALITÀ
2015
Il contributo è orientato a descrivere gli strumenti di conoscenza necessari per il trasferimento dei risultati della ricerca nel mercato. A questo scopo sono state individuate cinque differenti forme di conoscenza che devono simultaneamente far parte dei processi di trasferimento tecnologico e dell'imprenditorialità.
On the Moving Least Squares (MLS) approximation effectiveness in a T-Shaped tube hydroforming design
2009
On the choice of tool material in friction stir welding of titanium alloys
2012
Effect of Urea–Hydrogen Peroxide Content on the Photocatalytic Activity of Zinc Oxide Nanoparticles
2021
ZnO nanoparticles (NPs) were synthesized using zinc acetate dihydrate, ethanol, and oxalic acid as precursor, solvent, and complexing agent, respectively, and urea–hydrogen peroxide (UHP) as, simultaneously, nitrogen precursor and oxygen donor. The structural, morphological, textural, and optical properties of ZnO photocatalysts were investigated using different characterization methods such as XRD, SEM, BET, and UV-Vis-DRS. The XRD patterns showed that the products consisted of ZnO and revealed the presence of nitrogen. SEM images revealed the agglomeration and aggregation of NPs. The photocatalytic activity of ZnO samples was estimated based on the photo-oxidation of 2-propanol under UV i…
Problemes d'intel·lecció en el "Curial e Güelfa". La traducció com a eina per a la millora del coneixement dels clàssics medievals
2011
En aquest treball fem palesa la utilitat dels contrastos traductològics com a eina fonamental en la interpretació del sentit o significat d’una obra i un lèxic allunyat cronològicament de l’actualitat, com és el cas del "Curial e Güelfa", ja que les perspectives diverses dels traductorsd’una mateixa obra literària, així com els estudis ben fonamentats sobre el text en qüestió, contribueixen de manera eficaç a la consecució de l’objectiu de tot traductor: trobar les millors solucions lèxiques a fi de poder transmetre de la manera més fidel possible la intencionalitat i el sentit d’una obra del passat.
La comunicació humana i les noves tecnologies : Proposta didàctica
2012
Les noves tecnologies han sigut un dels factors que han fet avançar l’àmbit de les comunicacions humanes i a arrel d’això s’ha creat un nou espai a través del qual les persones ens relacionem i actuem moltes vegades sense conscienciar-nos de les conseqüències. Apareixen ací les anomenades xarxes socials. Veient aquesta importància en el nostre context, la educació haurà de tractar els mitjans de comunicació i introduir-los dins del currículum tant com a un coneixement que com a una eina d’aprenentatge. Els docents hauran de tenir en compte que cal que els alumnes aprenguen el impacte dels mitjans de comunicació en la societat i el seu paper en la vida diària així com que adopten una actitud…