Search results for "scienza"
showing 10 items of 1408 documents
Un'infanzia fatta di scienza e arte
2020
I contributi presentati in questo volume echeggiano tra di loro come un gioco di risonanze che travalicano ogni confine tra discipline per scavare tra le radici dell’umanità. Il testo è diviso in due parti idealmente collegate da una comune prospettiva sui bambini e sul loro modo conoscere e di entrare in relazione col mondo con gli occhi delle scienze e delle arti. L’approccio olistico, la curiosità e l’immaginazione, la libertà esplorativa e il piacere di creare connessioni tra le cose su piani diversi coinvolge totalmente singoli soggetti e gruppi, menti e corpi secondo una logica che rende impossibile segnare una demarcazione netta tra scienza e arte, soprattutto quando si parla di bamb…
Effect of the UV exposure on the creep behaviour of PLA based green composites
2018
Green composites made of biodegradable matrices and lignocellulosic fibers are receiving growing attention from both academia and industries. Despite a wide literature can be found about mechanical behavior of such kind of composites, at the best of our knowledge, only limited information is available about their creep behavior [1] and no papers have been yet done on the effect of ultraviolet exposition. The tensile creep behavior at 40 °C of PLA based composites, containing flax and jute twill weave woven fabrics, produced through compression molding, was investigated. As preliminary characterization, quasi-static tensile tests were carried out on virgin and UV aged composites
L'identità della scienza giuridica penale nell'ordinamento multilivello
2014
Lo scenario generale dell’attuale ordinamento multilivello pone importanti inter- rogativi alla scienza penale: dai rapporti fra fonti nazionali e sopranazionali alla interazione fra corti diverse, ma che concorrono nella tutela dei diritti fondamen- tali. Nella dinamica nuova dei rapporti tanto fra fonti normative, quanto fra autorità giudicanti non valgono più le tradizionali logiche deduttive di prevalenza gerarchica, ma si affermano nuove forme di influenza reciproca e di interazione. Lo studio, dopo aver chiarito preliminarmente significato e contesti del rapporto fra scienza penale e ordinamento multilivello, intende contribuire alla riflessione in argomento considerando tre settori p…
Compatibility between traditional ground layers and 3D printing materials
2018
Starting point of this work was the restoration of a Panel Painting depicting the Adoration of the Shepherds with a Saint Bishop, by an unknown author, stored in the Galleria Regionale della Sicilia di Palazzo Abatellis, in Palermo. It was decided to integrate a missing angular decorative element of the painting’s frame in order to restore the integrity of the frame by reverse engineering and 3D printing. Reintegration was feasible as the frame has a modular decorative pattern and the remaining three corners were available. Reverse engineering and 3D printing techniques have been used in order to find a solution according to the principles of recognition, reversibility and compatibility. Mo…
Integration of finite displacement interface element in reference and current configurations
2017
In the present paper the non-linear behaviour of a solid body with embedded cohesive interfaces is examined in a finite displacements context. The principal target is the formulation of a two dimensional interface finite element which is referred to a local reference frame, defined by normal and tangential unit vectors to the interface middle surface. All the geometric operators, such as the interface elongation and the reference frame, are computed as function of the actual nodal displacements. The constitutive cohesive law is defined in terms of Helmholtz free energy for unit undeformed interface surface and, in order to obtain the same nodal force vector and stiffness matrix by the two i…
Incremental Delamination Processes under Cyclic Loading
2012
On the mechanical behavior of BFRP to aluminum AA6086 mixed joints
2013
The aim of this work is to analyze the possibility to join aluminum alloy AA6086 and composite laminates reinforced with basalt fibers, an innovative material which use is growing in several applications as an alternative to glass fibers. To this goal, three joining techniques were investigated: mechanical by Self Piercing Riveting (in the next called SPR), adhesive by co-curing technique and mixed in which the joining techniques (i.e. adhesive and mechanical) were combined. Two manufacturing technologies (i.e. hand lay-up and vacuum bagging) were used both to produce composite substrates and to realize co-curing adhesion between the substrates to be joined. Mixed joints were realized by in…
Bilayer biodegradable films prepared by co-extrusion film blowing: Mechanical performance, release kinetics of an antimicrobial agent and hydrolytic …
2020
Abstract Bilayer biodegradable, eco-friendly films were prepared by co-extrusion film blowing, coupling polylactic acid (PLA) and Bio-flex ® (BIO). Furthermore, in the PLA layer, carvacrol (CRV) was added as a natural antimicrobial additive, whereas a nanoclay (D72T) was integrated to protect CRV from volatilization and to modulate release. The materials were analyzed by morphological, chemical-physical, mechanical testing. Furthermore, CRV release and degradation tests were performed. The results pointed out that coupling the two matrices allows gathering the stiffness of PLA with the ductility of BIO. Furthermore, the interlayer adhesion is promoted by CRV. D72T exerts a key-role in avoid…
On the response of flax fiber reinforced composites under salt-fog/dry conditions: Reversible and irreversible performances degradation
2022
Abstract Despite their scarce resistance to humid or wet conditions, natural fiber reinforced composites (NFRCs) seem to be able to partially recover their performances under discontinuous exposition to marine environment. To investigate this peculiarity, flax fiber reinforced composite was at first subjected to salt-fog spray condition at 35 °C for 15 and 30 days, respectively, and then stored in ‘‘dry” condition (i.e., 50% R.H. and 22 °C) between 0 and 21 days. The performances evolution was evaluated through flexural tests, water uptake and contact angle measurements. Moreover, the morphology of fractured mechanical samples was examined by using 3D optical microscope and scanning electro…
Experimental characterization of dacron 360 woven constitutive behavior
2010
In the present paper some experimental analyses of Dacron© 360 woven aimed to characterize its constitutive behavior are presented. This woven, widely adopted in sail manufacturing, is obtained by weaving polyethylene terephthalate (PET) yarn and it shows some peculiar features due to the manufacturing process. The experimental tests, in terms of tensile tests and cyclic tests, clearly show the orthotropy features of the material, its high strength and deformability. Finally, the examination with optical microscope of the tested specimens allows to evidence how the warp and weft yarns interact.