Search results for "Modelli"
showing 10 items of 1866 documents
Description of the Retention and Peak Profile for Chromolith Columns in Isocratic and Gradient Elution Using Mobile Phase Composition and Flow Rate a…
2014
The effect of the modifier concentration and flow rate on the chromatographic performance of a second generation Chromolith® RP-18e column, under isocratic and gradient elution with acetonitrile-water mixtures, was examined using four sulphonamides as probe compounds. The acetonitrile concentration was varied between 5 and 55% (v/v), and the flow rate between 0.1 and 5.0 mL/min, keeping the other factors constant. The changes in both retention and peak profile were modelled, and used to build simple plots, where the logarithm of the retention factor was represented against the modifier concentration (in gradient elution, against the initial modifier concentration), and the half-widths or wi…
History, Iconography and Digital Drawing for Architectural Heritage: The Case Study of the Church of S. Nicolò alla Kalsa in Palermo (Sicily)
2022
This contribution aims to test the efficiency of a research methodology based on an interdisciplinary approach. This is to be achieved through the case study of the disappeared church of S. Nicolò alla Kalsa in Palermo, an imposing medieval building dating back to the thirteenth and fourteenth centuries and demolished after an earthquake in 1823. The reconstruction of the original configuration of this disappeared monument was achieved through traditional research sources and tools in the field of architectural and urban history, as well as architectural drawing, relying on both traditional and up-to-date digital technologies. The main source used for this virtual reconstruction is a rich h…
Marco Tullio Cicerone, De officiis. Quel che è giusto fare
2019
Nel 44 a. C., in un periodo di profonda crisi delle istituzioni sociali e politiche di Roma, Cicerone dedica al figlio Marco un trattato che intende riordinare le forme dell’interazione tra i cittadini e rifondare la res publica. Consapevole che l’antico sistema di valori è ormai superato, Cicerone tenta di organizzare un sistema di trasmissione della memoria fra generazioni, regole di comportamento che indichino «quel che è giusto fare» ai giovani della città, cui tocca ripartire dalle rovine ancora fumanti dello stato. Una specie di «Etica spiegata a mio figlio», come si intitolerebbe oggi, che è diventata uno snodo fondamentale per il mondo latino, medievale e moderno, permeando la cultu…
La circolazione di modelli giuridici (legali o dottrinali) italiani nell’Africa sub-sahariana
2013
Il saggio analizza la presenza del modello giuridico italiano in Africa e le ragioni ed episodi che ne hanno determinato la circolazione.
Stochastic models for wind speed forecasting
2011
Abstract This paper is concerned with the problem of developing a general class of stochastic models for hourly average wind speed time series. The proposed approach has been applied to the time series recorded during 4 years in two sites of Sicily, a region of Italy, and it has attained valuable results in terms both of modelling and forecasting. Moreover, the 24 h predictions obtained employing only 1-month time series are quite similar to those provided by a feed-forward artificial neural network trained on 2 years data.
SISALv2: a comprehensive speleothem isotope database with multiple age–depth models
2020
Characterizing the temporal uncertainty in palaeoclimate records is crucial for analysing past climate change, correlating climate events between records, assessing climate periodicities, identifying potential triggers and evaluating climate model simulations. The first global compilation of speleothem isotope records by the SISAL (Speleothem Isotope Synthesis and Analysis) working group showed that age model uncertainties are not systematically reported in the published literature, and these are only available for a limited number of records (ca. 15 %, n = 107/691). To improve the usefulness of the SISAL database, we have (i) improved the database’s spatio-temporal coverage and (ii) create…
Reverse electrodialysis heat engine for sustainable power production
2017
Abstract Reverse Electrodialysis Heat Engine (REDHE) is a promising technology to convert waste heat at temperatures lower than 100 °C into electric power. In the present work an overview of the possible regeneration methods is presented and the technological challenges for the development of the RED Heat Engine (REDHE) are identified. The potential of this power production cycle was investigated through a simplified mathematical model. In the first part of the work, several salts were singularly modelled as possible solutes in aqueous solutions feeding the RED unit and the corresponding optimal conditions were recognized via an optimization study. In the second part, three different RED He…
Teachers’ responses to children in emotional distress: A study of co-regulation in the first year of primary school in Norway
2020
The purpose of this study was to explore how first-grade teachers respond to pupils in emotional distress within the framework of co-regulation. Co-regulation in this context refers to an adult–chi...
Obstacles modelling reality: Two exploratory studies on physics defined and undefined problems
2014
For some researchers, and perhaps for many teachers, problem-solving is strongly related to thinking (Mayer, 1983). Several reports highlight the importance of developing suitable skills to solve complex, ill-defined and boundless real-life problems in educated people (NSF Standards, U.S. Department of Labour, ABET engineering accreditation organization, and American Institute of Physics, mentioned in Etkina & Van Heuvelen, 2007; Bureau of Labour Statistics, U.S. Department of Labour, 2014; Competency Model Clearinghouse, 2012). Problem-solving is virtually the core of the professional activity of a physicist (Etkina, Van Heuvelen, White-Brahmia, Brookes, Gentile, Murthy, Rosengrant & Warre…
Modeling Developmental Processes in Psychology
2013
In the present article I suggest first that modeling in psychology can be described as an interactive process between a phenomenon under study (reality) and different levels of theoretical conceptualizations that vary in respect to how directly they can be related to empirical observations and at what level of generalization they operate. Then, I give three examples of my own work concerning building theories and testing models. Next, I discuss some caveats scientists face when building theories and models on the basis of their observations. Finally, I make a few conclusions on the basis of the article. peerReviewed