Search results for " Costruzione"
showing 10 items of 481 documents
Effects of mechanical deformation on electronic transport through multiwall carbon nanotubes
2017
Abstract The effects of mechanical deformation on the electron transport behavior of carbon nanotubes (CNTs) are of primary interest due to the enormous potential of nanotubes in making electronic devices and nanoelectromechanical systems (NEMS). Moreover it could help to evaluate the presence of defects or to assess the type of CNTs that were produced. Conventional atomistic simulations have a high computational expense that limits the size of the CNTs that can be studied with this technique and a direct analysis of CNTs of the dimension used in nano-electronic devices seems prohibitive at the present. Here a novel approach was designed to realize orders-of-magnitude savings in computation…
Flying Laser Spot Thermography technique for the NDE of Fibre Metal Laminates disbonds
2017
Abstract The present work investigates the features of an active Infrared-NDT Thermography technique derived from a Flying Laser Spot set-up for the analysis of interlaminar disbonds in layered structures in general and Fibre Metal Laminates in particular. The presented technique uses a laser-spot heat source, which moves at a constant speed, raster scanning the object surface. Interlaminar defects parallel to the surfaces act as barriers towards through-the-thickness heat diffusion. This produces some modifications over the surface thermal field which are well identified in the Standard Deviation calculated over a Reference Area following the heat source. The mechanisms leading to such def…
L’ABSIDE, COSTRUZIONE E GEOMETRIE: ALCUNE RIFLESSIONI
2015
The Apse, Construction and Geometry: some Reflections The interest in apses is the result of a chain of episodes, not always connected to one another, outlining a framework for fruitful inquiry. It is no coincidence that this need is felt in a land like Sicily, an island at risk of earthquakes where history has been forced to make do with an unstable and age-old status-quo existing between innovation and resilience. Many of the possible lines of reasoning can be found in the following essays, while in this paper I will try using some examples (not just strictly Sicilian) to clarify the meaning and requirements of this field of investigation, in the awareness of all the limits that a short d…
STUDIO NUMERICO-SPERIMENTALE DI GIUNZIONI IBRIDE A DOPPIA SOVRAPPOSIZIONE CFRP-ALLUMINIO
2013
The adhesively bonded joints and the mechanical joints between structural components made by composite materials or between elements made by composite and metal, are commonly used in different fields of modern industrial design and manufacturing, since they are characterized by economy, reliability and ease of assembly. The bonded joints are characterized by high stiffness and fatigue life, although delamination phenomena localized near the edges of attack of the adherends may limit their use, especially in particular applications where corrosive environments and humidity can lead to premature failure. In these cases, a possible alternative is offered by the well known riveted joints. On th…
Arcos, apoyos y "capialzati" sicilianos en el Architetto Pratico de Giovanni Amico (1750)
2015
Nel 1750 l’architetto Giovanni Amico (Trapani 1684-1754) pubblicava il secondo volume de L’architetto pratico, in cui metteva a punto le sue conoscenze teoriche e quelle acquisite in cantiere. Tra i vari temi affrontati, due capitoli riccamente illustrati sono dedicati in particolare ai problemi della costruzione geometrica degli archi e al dimensionamento geometrico degli appoggi in relazione alla luce e alla forma dell’arco stesso. Il contributo intende riflettere sugli argomenti e le modalità che l'architetto siciliano espone, in relazione alle consuetudini costruttive in Sicilia e agli eventuali debiti con la trattatistica precedente. L’indagine mirerà infatti a comprendere quali siano …
La facciata settentrionale della chiesa di S. Giuseppe dei Teatini a Palermo: spigolature documentarie
2007
Pubblicazione e commento di un documento d'archivio a corredo dell'attività progettuale di Niccolò Palma.
I ponti in Sicilia fra tradizione e innovazione (XVIII-XIX secolo)
2014
italiano In una regione geograficamente e idrograficamente complessa come la Sicilia il problema di costruire percorsi celeri - e dunque di realizzare ponti - è sempre stato attuale. Le difficoltà dei collegamenti interni spiegano, e in parte giustificano, la percezione che abbiamo oggi della Sicilia, come una realtà costituita da comprensori urbani frammentati ed eterogenei. Gli ostacoli naturali e la geografia hanno disegnato infatti una Sicilia plurale. Nell’Ottocento questa situazione costituiva un limite da infrangere; la borghesia imprenditoriale pretendeva maggiore integrazione, una piazza più ampia di mercato e l’esercizio di un dominio simbolico sullo spazio e sul tempo. I ponti, c…
Se raconter à travers la dansemouvement-thérapie: un parcours de formation pour des jeunes futurs formateurs
2016
In a time of crisis like the present one, defined by the two psychoanalysts Benasayag and Schmit (2003) "The age of sad passions," in which one feels constantly "a pervasive sense of helplessness and uncertainty," leading to retire into oneself and in a highly individualistic society in which everything is seen in utilitarian, competitive, terms, young adults facing in working life live in a condition of deep uneasiness (loneliness, feelings of inadequacy, lack of confidence ....). The future is no longer perceived as promise but as a threat, there is a pervasive feeling of not being able to affect reality, to not have any power. The historical and existential time disappears and becomes a …
"[...] L'architettura non è un Martini". Riflessioni sul BIM; "[...] Architecture is not a Martini". Reflections about BIM
2016
Da qualche anno il BIM sta diventando lo strumento principale nella progettazione, nel rilievo dell’esistente e nel recupero del patrimonio edilizio. In Italia tra le novità del Nuovo Codice Appalti vi è l’utilizzo del BIM che costituisce uno strumento per una riformulazione del rapporto fra amministrazione e impresa soprattutto per ridurre le varianti e quindi i costi di produzione e conseguentemente di gestione. Così come a tanti vantaggi, il BIM potrebbe portare anche a rischi e conseguenze negative, soprattutto nella fase progettuale, dovute al contributo dei vari attori che esso contiene al proprio interno. Attraverso le parole di alcuni Maestri, di studiosi della rappresentazione e co…
PROPAGAZIONE DELLA FRATTURA IN COMPONENTI SOLLECITATI DA PROCESSI ALEATORI A BANDA LARGA
2011
In this paper a method for estimating the crack propagation in components subjected to wide band random processes of loading is presented. The analysis has been carried out considering uniaxial stresses and stationary and gaussian processes. The method uses as input one parameter of the power spectral density (PSD) of the stress process, its variance and 2 parameters of the material and eliminate the need of the integration of the equation of Paris in time domain. The method has been developed by carrying out a significant amount of numerical simulations in which about a thousand different PSDs of different shapes and spectral parameters have been considered.