Search results for " TECNOLOGIA"
showing 10 items of 1359 documents
Schede di analisi dei casi studio
2010
La pratica del processo di privatizzazione
2010
L’esigenza di acquisire risorse finanziarie e sollevare lo Stato e gli altri enti territoriali dai costi di gestione dei beni culturali ha determinato l’avvio di un diffuso processo di privatizzazione del patrimonio costruito. Gli immobili, alienati o conferiti in concessione a privati per lunghi periodi, sono adibiti a nuove funzioni, che impongono trasformazioni per l’adeguamento a differenti esigenze. Tali interventi richiedono azioni di indirizzo e di controllo, per le quali la pubblica amministrazione ha la necessità di dotarsi di nuovi strumenti, rivolti sia a garantire la permanenza dei valori espressi dai beni, sia ad orientare le scelte in funzione delle politiche di sviluppo del t…
Un “laboratorio” di conoscenza nel Mediterraneo. Il Castello Utveggio a Palermo.
2009
Il presente studio approfondisce le tematiche, su esposte, ponendo l’attenzione sull’edificio storico “Il Grande Albergo Castello Utveggio”, che - per scelta di luogo e di destinazione d’uso, eccezionale per avvenimenti tecnici e costruttivi finalizzati a realizzarlo - presenta caratteristiche peculiari di identità di luogo fortemente correlato con la città di Palermo, con il paesaggio della Conca d’Oro e con il territorio. Posto sulla sommità del Primo Pizzo nel settore meridionale del Monte Pellegrino a 346 m s.l.m., è rivolto verso la città e il porto, fu progettato dall’architetto Giovan Battista Santangelo e realizzato nei primi decenni del ‘900.
Centri storici siciliani e accessibilità
2021
The Sicilian hinterland is dotted with small towns and villages. Nowadays, these are being depopulated due to their marginality with regard to economic flows and their limited accessibility, which was often the very reason for their creation. The paradox of this desolation is their state of conservation, which makes one view smartness and inclusiveness as genetic traits. The new economic models (sustainable, circular, low-cost, etc.) and the renewed demands (space on a human scale, balance with nature) justify the rethinking in terms of re-appropriation and recovery. The physical and geographical constraints could be rethought and might suggest combined solutions including sustainable mobil…
Centri a forte connotazione nell'entroterra dell'Italia meridionale: ripensare la città tra valori, vincoli fisici e opportunità tecnologiche
2020
The hinterland of central and southern Italy and the Islands is interspersed with mostly neglected architectural and urban heritage. These territories present many infrastructural, orographic, and economic constraints. A survival economy had survived, strongly tied to their productive, physical, and cultural identity. New models of the economy (sustainable, responsible, circular, green, sharing, and low-cost models) and new instances in the field of architecture and urban planning (accessible and inclusive spaces built for people) are certainly more appropriate for the reinterpretation of towns with a strong historical connotation: their characteristics are closer to a culture of quality, i…
Hydrolytic degradation of PLA/Posidonia Oceanica green composites: A simple model based on starting morpho-chemical properties
2021
Abstract In this work, we studied the degradability of PLA-based biocomposites containing Posidonia Oceanica flour at different loading levels and aspect ratios. Hydrolytic tests were carried out in neutral (pH = 7.4) and alkaline (pH = 10) environment. Time-dependent evolution of some key features, including residual mass and solution uptake, was monitored, and correlated with the changes observed in both morphology and chemical structure of the matrix. The results pointed out that biocomposites degraded much faster than neat PLA in both conditions, up to lose 70% of their initial weight after 1000 h immersion. A complex mechanism was unveiled, evidencing the crucial role of the fillers, c…
Synthesis of cyanoacetic acid by carbon dioxide and electrogenerated acetonitrile anion in undivided cells equipped with sacrificial anodes
2008
The electrochemical synthesis of cyanoacetic acid was performed by cathodic reduction of tetraalkylammonium salts (R4NX) in acetonitrile in undivided cells equipped with sacrificial anodes with concomitant or subsequent addition of carbon dioxide. These syntheses avoid the use of dangerous reagents, yield cyanoacetic acid in moderate faradic yields and confirm that the cathodic reduction of tetraalkylammonium salts in the presence of acetonitrile leads to the formation of the anion CNCH2-.
PHEA‐PLLA: A New Polymer Blend For Tissue Engineering Applications
2011
One of most important features that a material should have in order to be utilized for tissue engineering applications is its biocompatibility and its chemical surface. These properties are required for a high degree of cell adhesion on the scaffold. Poly‐L‐lactid acid (PLLA) is a biocompatible synthetic polymer approved by the Food and Drug Administration for human clinical applications. It has been largely employed, in the last years, as a constituent of surgical and implantable devices. PHEA is a biocompatible water‐soluble synthetic polymer, with a protein‐like structure, whose use as a drug carrier and as starting material for many other biomedical and pharmaceutical applications has b…
Recycling of dry and wet polyamide 6
2002
Recycling of polycondensation polymers can give rise to secondary materials with good mechanical properties only if a careful drying is carried out before the melt reprocessing operations. The presence of humidity provokes the hydrolytic chain scission of the macromolecules and the consequent decrease of molecular weight and properties. In this work, the drying step was substituted by the addition of an antioxidant that is able to protect the macromolecules because it is the autioxidant is more prone to hydrolysis, thus removing the water from the melt. The mechanical properties of polyamide 6 reprocessed more times in wet conditions and in the presence of this stabilizer are even better th…
Characterization of a fiber-reinforced new fully aromatic liquid crystalline polymer
1998
A new rigid liquid crystalline polymer that demonstrates good mechanical and thermomechanical properties and acceptable processing temperature has been recently synthesized and characterized. The melting temperature and some thermomechanical properties do not seem, however, suitable for use in some applications at high temperature or in the presence of aggressive fluids. The use of appropriate inorganic fillers can overcome these shortcomings. In this work the new LCP, polymerized in a bench-scale apparatus, and the same sample filled with carbon fibers are characterized. The properties of the carbon fiber filled LCP are compared with those of another filled wholly aromatic commercial LCP,…