Search results for "Tecnologie"
showing 10 items of 1379 documents
A sensitivity analysis on artificial neural networks fracture predictions in sheet metal forming operations
2008
Fabrication and Characterization of Dye-Sensitized Solar Cells
2014
Among the next-generation solar cells, a predominant role is played by Dye sensitized solar cells (DSSC) based on ruthenium complexes as sensitizers. They take advantage of a photoelectrochemical system to transform solar radiation into electric energy. In fact, DSSCs represent a cost-effective alternative to traditional silicon-based photovoltaic devices and they do not require expensive and sophisticated apparatus for their fabrication. In this work, we have produced and tested ruthenium DSSCs. In particular, we have measured the main parameters of these cells, such as the electrical and power performances and the efficiency levels, at different irradiance levels and at different incident…
La Lingua dei Segni e le nuove tecnologie. Variazioni e modifiche nella lingua e nella percezione dei segnanti
Il lavoro di ricerca affronta le problematiche relative ai nuovi scenari della comunicazione e della formazione per le persone sorde che fanno uso della Lingua dei Segni Italiana nella società delle nuove tecnologie. La tesi pertanto dà alcuni accenni relativi alla sordità, espone le caratteristiche specifiche della Lingua dei Segni e della scrittura dei sordi, presenta il mondo delle nuove tecnologie sia in ambito comunicativo che formativo, analizzando il panorama del Web 2.0, i social network e i nuovi strumenti della formazione quali le piattaforme didattiche e gli ambienti di e-learning. Il lavoro propone inoltre una riflessione su come il linguaggio e la comunicazione siano cambiate n…
Preliminary Investigation of Biogenic Amines in Type I Sourdoughs Produced at Home and Bakery Level
2022
During a survey for isolating sourdough lactic acid bacteria (LAB), 20 dough samples produced at the bakery level (BL) or home-made (HM) were collected. An enzyme-based colorimetric method revealed a total biogenic amines (BAs) concentration in the range 41.4–251.8 ppm for six (three BL and three HM) sourdoughs characterised by unpleasant odours. Eight BAs generally investigated in foods were identified and quantified from these six samples by ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC–MS/MS). Only one HM sample contained almost all analysed BAs. Tryptamine was exclusively detected in HM sourdoughs (0.71–24.1 ppm). Putrescine, tryptamine, …
Photocatalytic activity in gas–solid regime of ZnO-ZnAl2O4 composites
2011
A multi-objective Pareto design approach for simultaneous control of thinning and springback in complex stamping operations.
2009
Abstract In sheet metal forming operations design, optimization problems have to be solved in order to reach optimal process conditions. In these problems, there are some crucial issues to be taken into account: - most of the problems are multi objective problems, generally characterized by conflicting objectives: the definition of proper parameters aimed to prevent both springback and fracture is a typical example of an optimization problem in sheet metal forming characterized by conflicting goals; - in an industrial environment a great interest would be focused on the availability of a cluster of possible optimal solutions instead of a single “almost optimal” solution. Taking into account…
On the springback prediction in 3d sheet metal forming processes
2008
Heterogeneous photocatalysis: guidelines on experimental setup, catalyst characterization, interpretation, and assessment of reactivity
2019
Soon after the publication of the first pioneering works on heterogeneous photocatalysis, the number of papers on this topic continuously increased. This intriguing field of research is very complex as it endows with an interdisciplinary overview that involves different aspects of chemistry, physics, material and environmental sciences. Even if photocatalytic applications in real processes are often difficult to be implemented and scaled-up, investigations at laboratory scale are easy to be performed, and in some cases they may give rise to misconceptions. For this reason, the present work aims to sum up most of the common experimental techniques and procedures generally used in heterogeneo…
On the slabbing of stones throughdiamond wire cutting
2010
Diamond wires are usually used in the cutting operations aimed to obtain slabs of stones. This tool consists of a steel cable on which are mounted annular metal–diamond pearls. The use of this technology expanded all over the world because of its advantages on other slabbing techniques as both technical and economical aspects are considered. It should be observed that with this technology wear phenomena must be properly monitored in order to obtain the best process conditions. Inthis article, thediamondwire cutting operation is investigated, highlighting the process mechanics and the wear phenomena occurring in the used tools. Furthermore, a modified version of the tool itself is proposed w…
TikTok per una didattica universitaria efficace ed efficiente
2023
È ormai noto come l’utilizzo della tecnologia consenta da un lato una maggiore personalizzazione dell’apprendimento e dall’altro permetta una diversificazione dei contenuti da presentare. Un'ampia letteratura ha messo in evidenza la valenza dell'impiego dello storytelling nell'ambito della comunicazione didattica e per questo motivo si è voluto valutare con che impatto la produzione di contenuti su TikTok possa diventare una metodologia innovativa di apprendimento. Il seguente contributo presenta una ricerca che ha coinvolto 350 studenti del primo anno del Corso di Laurea in Scienze della Formazione Primaria dell’Università degli Studi di Palermo nell’anno accademico 2022/2023 sulla progett…