Search results for " sperimentale"
showing 10 items of 935 documents
O2-Loading Treatment of Ge-Doped Silica Fibers: A Radiation Hardening Process
2016
International audience; The effects of a high-pressure O2-loading treatment on the radiation response of Ge-doped optical fibers (OFs) were investigated. We found that the incorporation of high concentration of interstitial molecular oxygen remarkably enhances the resistance to ionizing radiation of Ge-doped OFs in the UV-Visible domain and, at the same time, improves the transmission of UV light in the unirradiated OF sample. By comparison with previously reported results, the O2-loading treatment turned out to increase the radiation resistance of Ge-doped OFs more efficiently than F or Ce codoping. The understanding of such amelioration relies in basic radiation-induced mechanisms that we…
Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation
2020
We investigated the nature, optical properties, and decay kinetics of point defects causing large transient attenuation increase observed in silica-based optical fibers exposed to short duration and high-dose rate x-ray pulses. The transient radiation-induced attenuation (RIA) spectra of pure-silica-core (PSC), Ge-doped, F-doped, and Ge + F-doped optical fibers (OFs) were acquired after the ionizing pulse in the spectral range of [∼0.8–∼3.2] eV (∼1500–∼380 nm), from a few ms to several minutes after the pulse, at both room temperature (RT) and liquid nitrogen temperature (LNT). Comparing the fiber behavior at both temperatures better highlights the thermally unstable point defects contribut…
Radiation Response of Ce-Codoped Germanosilicate and Phosphosilicate Optical Fibers
2016
We report an experimental investigation on the effects of Ce-codoping in determining the radiation response of germanosilicate and phosphosilicate Optical Fibers (OFs) in the UV-Visible domain and up to doses of $1~\hbox{MGy}({\rm SiO}_{2})$ . We show that the addition of Ce strongly impacts the Radiation Induced Attenuation (RIA) of both types of fibers. In the first case the radiation induced losses increase, whereas in the second one decrease. By combining the online RIA measurements with the Electron Paramagnetic Resonance (EPR) ones, we are able to infer the basic microscopic mechanisms taking place under irradiation, which involve the cerium codopant and some of the known Ge-related o…
ORAL EXPRESSIVE COMPETENCE’S DEVELOPMENT BY USE OF MINDTOOLS
2015
The aim of this work is to verify the efficacy of a training programme focused on the enhancement of oral expressiveness (the generation of ideas and planning, pragmatic awareness), realized with a group of children between 10 and 12 years, in the last year of primary school and in the first year of secondary school in the Palermo area. The educational activities were conducted from January to June 2014. Action learning provided a learning environment based on real problem solving with team work; the active search for information, discussion and reflection, as well as decision-making, were assisted by semantic networks (concept maps) and knowledge construction tools. Oral presentation, or p…
Optimization of the JUNO liquid scintillator composition using a Daya Bay antineutrino detector
2021
To maximize the light yield of the liquid scintillator (LS) for the Jiangmen Underground Neutrino Observatory (JUNO), a 20 t LS sample was produced in a pilot plant at Daya Bay. The optical properties of the new LS in various compositions were studied by replacing the gadolinium-loaded LS in one antineutrino detector. The concentrations of the fluor, PPO, and the wavelength shifter, bis-MSB, were increased in 12 steps from 0.5 g/L and <0.01 mg/L to 4 g/L and 13 mg/L, respectively. The numbers of total detected photoelectrons suggest that, with the optically purified solvent, the bis-MSB concentration does not need to be more than 4 mg/L. To bridge the one order of magnitude in the detect…
Gli esercizi ADVP realizzati dal liceo classico "Altavilla" di Palermo
2009
Il contributo presenta una serie di esercizi ADVP (Activaction du Developpement Vocationnel et Personnel) realizzati e sperimentati, all'interno del Progetto Aracne Due (P.O.R. Sicilia 2000/2006 - Asse III - Mis. 3.05), presso il liceo classico Altavilla di Palermo. L'originalità delle attività ADVP realizzate consiste nel fatto che i compiti svolti dagli studenti vertono principalmente sulle conoscenze e abilità disciplinari previste dai programmi ministeriali relativi al liceo.
Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory
2019
The profile of the longitudinal development of showers produced by ultra-high energy cosmic rays carries information related to the interaction properties of the primary particles with atmospheric nuclei. In this work, we present the first measurement of the average shower profile in traversed atmospheric depth at the Pierre Auger Observatory. The shapes of profiles are well reproduced by the Gaisser-Hillas parametrization within the range studied, for E>10 17.8 eV .A detailed analysis of the systematic uncertainties is performed using ten years of data and a full detector simulation. The average shape is quantified using two variables related to the width and asymmetry of the profile, and …
Ripensare la corresponsabilità educativa tra scuola e famiglia: vissuti e riflessioni di dirigenti scolastici al tempo del Covid-19
2021
Il Patto di corresponsabilità educativa sancisce formalmente l’alleanza educativa tra scuola e famiglia. Tuttavia, oggi il rischio è che il Patto rimanga solo un atto formale. Appare, allora, necessario approfondire il senso e le modalità pratiche della partnership scuola-famiglie. Nel fare ciò, il ruolo del Dirigente Scolastico risulta fondamentale per la promozione di una vera e propria partnership educativa. Il paper presenta un approfondimento teorico sul tema citato, con riferimento all’attuale crisi pandemica e alcuni risultati preliminari di un’indagine esplorativa svolta durante l’A.S. 2020/2021 con venti dirigenti scolastici di scuole siciliane per comprendere come la relazione è c…
Kairós. Un tempo nel mezzo. Percorso multidisciplinare di analisi dell’esperienza di assistenza ai pazienti oncologici terminali
2011
La concezione personalistica cristiana permette una corretta visione antropologi- ca ed etica che fonda le riflessioni delle scienze umane (sociologia, psicologia, pedagogia, scienze della comunicazione) che vogliono analizzare le situazioni in cui versano il paziente oncologico terminale, i suoi familiari e coloro che si occupano dell’attività di assistenza clinico-sanitaria, sociale e volontaria. Se- condo tale concezione, la “persona” è un’unità inscindibile di corpo, psiche e spirito, di sesso maschile e femminile, destinata a una dimensione trascendente e ultraterrena dell’essere. La persona ammalata di cancro, in questa visione, non può essere ridotta a mero agglomerato psicofisico, a…
Le percezioni dei futuri insegnanti di sostegno di scuola secondaria di primo e secondo grado nei confronti della disabilità e dell’inclusione: un’in…
2022
Gli insegnanti di sostegno giocano un ruolo fondamentale nei processi di valorizzazione delle differenze individuali e i loro atteggiamenti hanno delle importanti ricadute sulla qualità dei processi inclusivi a scuola. Nel panorama internazionale sono presenti molte ricerche volte ad individuare i principali fattori che potrebbero influenzare e determinare gli atteggiamenti degli insegnanti di sostegno nei confronti della disabilità e dell’inclusione (Sharma, 2012; Kraska, Boyle, 2014; EADSNE, 2010; OMS, 2011; Cham- bers, 2017; Mura, Zurru, 2016; Aiello et al., 2019; Sharma, Aiello, Pace, Round, Subban, 2018). Il contributo presenta una ricerca svolta nell’a.a. 2020-2021 con 1134 futuri ins…