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Trieste, Italy

Bedon C.,Piazzale Europa | Amadio C.,Piazzale Europa | Sinico A.,Piazzale Europa
Engineering Structures

Current applications in buildings of structural glass elements often require design rules and formulations able to provide acceptable predictions for phenomena complex to describe, which generally depend on combination of several geometrical and mechanical aspects. The estimation of the buckling resistance of glass elements, for example, represents a topic of large interest for researchers, due to typical high slenderness ratios, limited tensile strength and brittle material behavior. In the paper, the buckling response of glass columns under impulsive orthogonal pressures (e.g. blast) and combined static compressive vertical loads (e.g. gravity loads or further service loads) is investigated. The dynamic buckling behavior of columns in out-of-plane bending is primarily analyzed. Advanced numerical nonlinear dynamic simulations are then performed on various laminated columns, by means of 3D numerical FE-models able to take into account the interaction of simultaneous loads and possible glass cracking. Analytical calculations are also carried-out by means of single-degree-of-freedom (SDOF) formulations derived from structural dynamics theories, in order to properly estimate blast and second-order effects on maximum deflections and corresponding tensile stresses. Finally, based on the rather good correlation generally found between numerical and analytical calculations, a design approach is proposed for practical estimation of buckling strength of glass elements in the analyzed loading and boundary conditions. © 2014 Elsevier Ltd. Source

Colussi I.,Piazzale Europa | Cortesi A.,Piazzale Europa | Gallo V.,Piazzale Europa | Fernandez A.S.R.,Piazzale Europa | Vitanza R.,Piazzale Europa
Chemical and Biochemical Engineering Quarterly

In this study, an experimental setup for the evaluation of a two-stage anaerobic digestion has been developed: a laboratory-scale apparatus was assembled employing solid potatoes as energy crops. Two coupled 5-litre batch-fed stirred reactors, one for the hydrolytic- acidogenic step and one for the acetogenic-methanogenic step, kept at mesophilic temperature (308.1 K), were adopted. Evaluated in the first acidogenic reactor was the influence of fermentative yeast (Saccharomyces cerevisiae) on the degree of hydrolysation and on the acidification rate of the vegetable substrate. All runs were performed without the addition of chemicals. Samples of hydrolysed substrate were sent to the second methanogenic bioreactor, fed with an industrial anaerobic sludge and selected lyophilized anaerobic bacteria, in order to evaluate the methane yield of the produced biogas and the specific methanogenic activity (SMA). The whole procedure was repeated simulating an anaerobic sequencing batch reactor (ASBR) process. Source

De Simone I.,University of Trieste | Coceani N.,Piazzale Europa | Farra R.,Piazzale Europa | Fiorentino S.M.,Piazzale Europa | And 6 more authors.
Chemical and Biochemical Engineering Quarterly

One of the possible causes of failure of the mechanochemical activation of poorly soluble drugs relies on the scarce drug wettability. Indeed, the mechanochemical process comports the disposition of drug nano-crystals and amorphous drug, generated by the destruction of original drug macro-crystals, on the surface of the carrier (acting as stabiliser), usually represented by crosslinked polymeric particles. Accordingly, the scarce drug wettability can reduce the beneficial action of mechanochemical activation (nano-crystals and amorphous drug are characterised by a higher solubility with respect to the original macro-crystals). In this light, this paper is focussed on the use of surfactants for the increase of delivery system (drug plus carrier) wettability. In particular, the surfactant-polymer systems are characterised for what concerns their bulk and surface properties. This allows to select the best surfactant and to experimentally verify its effect on the release kinetics of a poorly soluble and wettable drug. Source

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