1,721,053 research outputs found
Implementation of the Italian school-work alternating programme within chemical engineering activities
No full textThis paper shows the implementation and the results of the application of the problem-based learning methodology within the framework of the school-work alternating programme (SWAP) in Italian High Schools. This methodology was articulated through five specific projects aimed at different student profiles inside a research group of Chemical Engineering at the University of Genoa (Italy). The proposed activities were aligned with the expected learning outcomes where creativity and originality were highly encouraged in order to promote lateral thinking. All the tasks were carried out in groups to boost team engagement and collaborative learning and used technological tools in specific problem-solving contexts. Students demonstrated positive attitudes towards the used technological tools, the collaborative work and the applied methodology. The great majority of the students showed satisfaction with the ICT tools and considered them as useful for their future career. The results also pointed out that participation and motivation were highly appreciated which was actually the basis of a successful implementation of the methodology. As a result of the exchange, students were able to promote their social and intellectual skills outside their usual comfort zone. At the same time, it constituted a public engagement opportunity for University as well as an important promotion tool towards society. Overall, the activities satisfied the main objectives of SWAP in terms of development of transversal competences and promotion of new technological skills and, more importantly, constituted an informative appreciated link between classroom lessons and, in this case, their immediate future as university students
I Fenomeni di Arato e i Catasterismi di Eratostene nelle illustrazioni del manoscritto Vat. gr. 1087
No full textIl testo di Arato e i Catasterismi nelle illustrazioni del codice
Review of Experimental Activities and Recent Developments of Spouted Bed Reactors at Different Operational Scales
No full textRecent research advances and technological developments of spouted bed reactors (SBRs) have been discussed in this work. SBR has aroused increasing interest since their invention in 1955 due to its flexibility in processing different feedstocks and the high process yields that can be achieved due to its characteristic fluid dynamics. However, even though highly satisfactory results have been obtained at the laboratory scale for different applications (i.e., drying or thermochemical reactions, among others), their full implementation at an industrial level is still scarce, mainly due to the challenges encountered for their scale-up. In this work, an initial short description of SBR and configurations is followed by a review of the main experimental activities that have been conducted at different scales in the period 2013–2023. Advanced solutions such as multi-unit reactors and the use of rectangular geometries instead of the classical cylindrical ones have arisen as potential areas for further study and development to achieve a reliable implementation of the spouted bed technology at an industrial scale
Current status of energy production from solid biomass in North-West Italy
No full textData on the thermochemical plants fed by solid biomass in the north-west area of Italy (Liguria, Lombardy, Piedmont and Aosta Valley) have been organised, analysed and discussed. Moreover, the biomass availability and potential has been evaluated. A total of 28,167 plants have been categorised according to their typology and output: thermo-electric power plants for electricity production, thermal plants for heat production, cogeneration plants for combined heat and electricity production and district heating installations for local heating purposes. In general, separate observations for the different provinces may be drawn. Liguria stands out as the most evident case of under-exploited biomass potential, followed by Aosta Valley, which, however, is rich in hydroelectricity. Lombardy and Piedmont are more virtuous and have several plants in their territory. The construction of new plants and the upgrade of existing ones may bring noteworthy benefits, as well as the use of added value sub-products to foster circular economy approaches
La rendicontazione di brevetti e spin off nelle Università statali: un'indagine empirica
No full textCo-incineration of rice straw-wood pellets: A sustainable strategy for the valorisation of rice waste
No full textAgricultural activities produce an estimated amount of 32.7 MToe/year of residues in EU countries. They are mostly disposed in landfills, incinerated without any control, or abandoned in fields, causing severe impacts on human health and environment. Rice is one of the most consumed crops worldwide with an annual production of 782 million tons according to the Food and Agriculture Organization of the United Nations database. In this context, the EU-funded project LIFE LIBERNITRATE promotes the use of renewable residual sources (i.e., rice straw) to obtain new materials with an added value. The methodology is based on the incineration of rice straw in an own-designed and constructed valorization system. Rice straw/wood pellets are burned in optimized conditions to produce a maximized quantity of ashes with high silica content. These materials will be then used to treat water polluted with nitrates, representing an optimal example of circular economy strategy. In this work, the own-designed valorization unit is described, with special focus on its main constituting elements. The theoretical study of the co-incineration of rice straw and wood pellets identified the optimised combustion conditions. Experimental tests using the theoretical inputs confirmed the most adequate operational conditions (10 g rice straw pellets/min + 10 g wood pellets/min, 6-7 Nm3/h of air, T = 500 ◦C) and helped in the definition of improvements on the experimental plant
Il mito di Orione in Arato e nei suoi traduttori latini
Full text linkAnalisi del mito di Orione in Arato e nei suoi traduttori latini (Cicerone, Germanico, Avieno): il confronto tra le 4 versioni consente di far emergere l'originalità e l'individualità di ciascuna di queste riscritture rispetto al modello greco, e dà modo di cogliere le dinamiche evolutive della tradizione poetica aratea
Comparison of different drag models in CFD-DEM simulations of spouted beds
No full textSpouted beds are commonly simulated through the Computational Fluid Dynamics – Discrete Element Method approach. The choice of the drag model is still a matter of debate, as they feature peculiar operative conditions. In this work, we simulated two spouted beds containing Geldart-D particles. We tested seven drag models: three are classic models, while four are developed through advanced computational techniques. The results indicate that the key variable is the ratio between the operative and the minimum spouting gas velocity (u/ums). At u = ums only the Gidaspow model can always predict fluidisation, but at low u/ums values the Beetstra model is the best compromise. For higher values, the Rong and Di Felice models behave better, while the others overestimate the particles' velocity. These results can be useful to identify the best performing model and show there is a need for more appropriate models for spouted beds
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