1,721,160 research outputs found
Premessa
No full textPremessa illustrativa del percorso scientifico del volume, che rispecchia gli Atti del Convegno svoltosi fra Scandiano, Reggio emilia, Bologna nell'ottobre 2005. Paola Vecchi è stata anche responsabile scientifica nonché organizzatrice della sezione bolognese del Convegno
Il mondo circumnavigato di Antonio Pigafetta
No full textThe so called 'Relazione' written by Antonio Pigafetta is the fullest narrative of the first circumnavigation of the world, started by Ferdinand Magellan and completed by Juan Sebastian Elcano (1519-1522). Experience and literature and literature mix in Pigafetta's writing, and his account is a real book, not a simple diary. This essay gives some clues to the interpretation of text focalizing on the main stages of the voyage
L. Canova, A. Di Lauro, F. Franceschini, Premessa, in L. Canova, A. Di Lauro, F. Franceschini (a cura di), Dante e il cibo. Uno sguardo interdisciplinare, in Collana NutriDialogo. Il Diritto incontra le altre Scienze su Agricoltura, Alimentazione e Ambiente, Ets, 2023, 9788846765796, p. 7-8
No full textGli studi danteschi di Franca Ageno
No full textFranca Ageno was a prominent Italian philologist and historian of language. She worked for a long time on Dante's Convivio and finally provided a critical edition of the text, which is still unsurpassed. She also wrote many relevant essays about specific issues connected to the exegesis of Commedia
Non si farà mai più tal viaggio. Pigafetta e la prima circumnavigazione attorno al mondo
No full textA catalog of the Exhibition held in Vicenza (6th September 2022 - 8th January 2023)
Characterization of electromagnetic device by means of spice models
Full text linkIn this paper, the lumped parameter circuital approach devoted to the simulation of massive, conductive, and ferromagnetic cores including eddy currents and non-linearity is presented. In the first part of the paper, the circuit analogies devoted to the simulation of magnetic structure coupled with external electrical and eventually mechanical equations are summarised. The two techniques are known in the literature as reluctance-resistance and permeancecapacitance analogies. In particular, it is put in evidence the exploitation of the gyrator component in the modelling of the coupling among magnetic and electrical quantities. The originality of this paper consists in demonstrating for the first time that the rotator-capacitor approach is very suitable for simulations in spice environment and the solution is validated on real applications. Following the circuital approach, the effect of the conductivity and nonlinear magnetic behaviour of the magnetic branches is formalized and introduced in the model. The simulation of the conductivity behaviour, which introduces in massive cores significant eddy current effects, is modelled according to the two possible analogies: the reluctance and the permeance-capacitor model. Under sinusoidal steady-state behaviour, energy aspects related to the two models are then presented and discussed. The non-linearity is taken into account through the fixed-point technique which is suitable for a lumped circuit representation. The full circuital approach is then adopted for the simulation of the real electromechanical actuator under transient and sinusoidal steady-state behaviour conditions. The simulated result is then compared with numerical finite element and experimental results
Flywheel Energy Storage System in Italian Regional Transport Railways: A Case Study
No full textIn this paper, we looked at the role of electromechanical storage in railway applications. A mathematical model of a running train was interfaced with real products on the electromechanical storage market supposed to be installed at the substation. Through this simulation, we gathered data on the recoverable energy of the system, its advantages, and its limitations. Various storage powers were run along variations in speed and gradient to paint a clearer picture of this application. Throughout these simulations, the energy savings were between 25% and 38%, saving up to 0.042 kWh/(seat km)
A nonlinear voltage driven field approach for the analysis of closed slot induction motors
No full textMitigation Solutions for the Magnetic Field Produced by MFDC Spot Welding Guns
Full text linkAmong the different welding technologies, portable welding guns are one of the most critical devices in relation to human exposure to electromagnetic fields. This paper focuses on medium frequency (MF) direct current guns proposing two actions aimed to the mitigation of the magnetic field generated during the welding process. The first action consists in the adoption of a passive shield for the on-board MF transformer. The analysis points out that the transformer alone produces a magnetic field that can exceed the prescribed limits. Therefore, a suitable mitigation system is identified. The second action aims to mitigate the predominant magnetic field that is generated by the electrodes of the welding gun. The analysis of the field waveforms shows that the rise time of the welding current pulse is the main parameter affecting the exposure index. The effect of the increase of the rise time is investigated through experimental and numerical analyses. The results prove that a small increase of the rise time causes a significant reduction of the exposure level. It is noteworthy that the two mitigation actions can be adopted on both existing and newly developed welding guns as they do not require any structural modification of the welding device
Considerations about different analytical methods devoted to the design of ELF magnetic field shields
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