324,297 research outputs found
Il mondo bizantino, II: l'Impero bizantino (641-1204)
No full textCura (con emendamenti e aggiornamenti bibliografici) della versione italiana di J.-C. CHEYNET (sous la direction de), Le monde byzantin, II. L’Empire byzantin (641-1204), Paris, Presses Universitaires de France, 2006.Co-editorial oversight, incl. bibliographical revisions and updates, of the Italian version of J.-C. CHEYNET (sous la direction de), Le monde byzantin, II. L’Empire byzantin (641-1204), Paris, Presses Universitaires de France, 2006
Una passeggiata nell'Aldilà in compagnia degli antichi
No full textMigliaia di anni fa, nei tempo del mito, Odisseo affonda l'ancora di fronte alla terra di nebbia dei Cimmeri e si appresta a evocare le ombre dei trapassati. Da quel giorno, molte navi, uomini, donne si sono affacciati sull'universo oltremondano dei pagani: ne hanno esplorato da vivi i confini, ne hanno sperimentato l'inesorabile abbraccio dopo la morte. "Una passeggiata nell'aldilà" ripercorre il viaggio di queste anime, lasciando che la voce degli Antichi emerga senza filtri dalle tenebre dell'Oltretomba, dalle isole chiare dei Beati, dalle profondità insondabili del Tartaro: passi celebri e poco noti, frammenti di poesia e brani in prosa, papiri e lucenti lamine d'oro si ritrovano uno accanto all'altra per raccontare la storia di chi non c'è più, ma anche una visione dell'Aldilà solo apparentemente sconfitta dal tempo e dal trittico.- inferno, purgatorio, paradiso. Questo itinerario si apre con un «invito al viaggio»: un lungo saggio pensato per accompagnare per mano il lettore fra i meandri perigliosi dei regni d'ombra e per restituirgli, vivida, una visione della morte che ancora alberga, sotto traccia, nell'immaginario di ciascuno di noi. Due racconti cornice - l'XI canto dell'Odissea e il VI dell'Eneide - incastonano questo mondo fatto di squarci di luce, di dolore e di pianto, ma anche di irresistibile comicità. Con un'antologia di testi tradotti e commentati.Thousands of years ago, in the time of myth, Odysseus sank anchor in front of the Cimmerians' land of mist and prepared to summon the shadows of the dead. Since that day, many ships, men and women have looked out over the pagans' underworld: they have explored its boundaries while still alive, they have experienced its inexorable embrace after death. "A walk in the afterlife" retraces the journey of these psychai, allowing the voice of the Ancients to emerge unfiltered from the darkness of the Underworld, from the clear islands of the Blessed, from the unfathomable depths of Tartarus: famous and little-known passages, fragments of poetry and prose passages, papyruses and shiny gold leaf are found side by side to tell the story of those who are no longer there, but also a vision of the Afterlife only apparently defeated by time and the triptych. hell, purgatory, heaven. This itinerary opens with an "invitation to travel": a long essay designed to take the reader by the hand through the perilous meanders of the shadowy realms and to give him back, vividly, a vision of death that still dwells, under trace, in the imagination of each of us. Two frame stories - the 11th canto of the Odyssey and the 6th canto of the Aeneid - set this world of glimpses of light, pain and tears, but also of irresistible comedy. With an anthology of translated and commented texts
Study of the radioactivity induced in air by a 15-MeV proton beam.
No full textRadioactivity induced by a 15-MeV proton beam extracted into air was studied at the beam transport line of the 18-MeV cyclotron at the Bern University Hospital (Inselspital). The produced radioactivity was calculated and measured by means of proportional counters located at the main exhaust of the laboratory. These devices were designed for precise assessment of air contamination for radiation protection purposes. The main produced isotopes were 11C, 13N and 14O. Both measurements and calculations correspond to two different irradiation conditions. In the former, protons were allowed to travel for their full range in air. In the latter, they were stopped at the distance of 1.5 m by a beam dump. Radioactivity was measured continuously in the exhausted air starting from 2 min after the end of irradiation. For this reason, the short-lived 14O isotope gave a negligible contribution to the measured activity. Good agreement was found between the measurements and the calculations within the estimated uncertainties. Currents in the range of 120–370 nA were extracted in air for 10–30 s producing activities of 9–22 MBq of 11C and 13N. The total activities for 11C and 13N per beam current and irradiation time for the former and the latter irradiation conditions were measured to be (3.60 ± 0.48) × 10−3 MBq (nA s)−1 and (2.89 ± 0.37) × 10−3 MBq (nA s)−1, respectively
Designing 3D Virtual World Platforms for E-Learning services. New Frontiers of Organizational Training
No full textThe World Wide Web is, amongst the several different media available, the most global, interactive, and dynamic medium to share information. World wide web services were used in the last decade for e-learning applications, both in academic and business settings. E-learning services, provided through e-learning platforms, allow individuals to develop competences that might turn into organizational competences and eventually lead to competitive advantage. The development and usage of 3D virtual world platforms for e-learning services is an emerging phenomenon that challenges and enlarges the very idea of learning environment. Within this context this paper sheds light on this new frontier of e-learning services analyzing relevant literature on the application of 3D virtual world platforms in this context
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