292 research outputs found
La Quadreria della Fondazione Carletti Bonucci nel Palazzo Baldeschi di via del Loto a Perugia
No full textIl saggio ricostruisce le informazioni sul palazzo Baldeschi già Righetti, legandone le fasi costruttive alle vicende delle famiglie che nel corso di circa quattro secoli ne detennero il possesso; analizza inoltre i caratteri della collezione, che annovera circa trecento fra dipinti, sculture e oggetti di arte decorativa, fondandosi sugli antichi inventari ancora presso il palazzo e definendo le linee di ricerca che hanno guidato lo studio del materiale, in gran parte inedito
Gamma-ray burst engines may have no memory
No full textContext. A sizeable fraction of gamma-ray burst (GRB) time profiles consist of a temporal sequence of pulses. The nature of this stochastic process carries information on how GRB inner engines work. The so-called interpulse time defines the interval between adjacent pulses, excluding the long quiescence periods during which the signal drops to the background level. It was found by many authors in the past that interpulse times are lognormally distributed, at variance with the exponential case that is expected for a memoryless process.
Aims. We investigated whether the simple hypothesis of a temporally uncorrelated sequence of pulses is really to be rejected, as a lognormal distribution necessarily implies.
Methods. We selected and analysed a number of multi-peaked CGRO/BATSE GRBs and simulated similar time profiles, with the crucial difference that we assumed exponentially distributed interpulse times, as is expected for a memoryless stationary Poisson process. We then identified peaks in both data sets using a novel peak search algorithm, which is more efficient than others used in the past.
Results. We independently confirmed that the observed interpulse time distribution is approximately lognormal. However, we found the same results on the simulated profiles, in spite of the intrinsic exponential distribution. Although intrinsic lognormality cannot be ruled out, this shows that intrinsic interpulse time distribution in real data could still be exponential, while the observed lognormal could be ascribed to the low efficiency of peak search algorithms at short values combined with the limitations of a bin-integrated profile.
Conclusions. Our result suggests that GRB engines may emit pulses after the fashion of nuclear radioactive decay, that is, as a memoryless process
Statua acefala femminile panneggiata da Palazzo Balleani-Baldeschi di Osimo
No full textA headless female statue is preserved within the private collection of Palazzo Balleani-Baldeschi in Osimo. The statue, of unknown provenance, belongs to the Schulterbausch-Typen, a form that was common in various versions during the Hellenistic and Imperial Roman periods. The sculpture can be dated from the late 1st to the 2nd century AD.Si presenta una statua femminile acefala conservata a Osimo nella collezione privata di Palazzo Balleani-Baldeschi. La statua, di provenienza sconosciuta, appartiene al Schulterbausch-Typen, tipologia diffusa in molte varianti in età ellenistica e imperiale romana. La scultura è databile tra la fine del I e il II secolo d.C
Stato della SS. chiesa papale Lateranense nell'anno MDCCXXIII.
No full textSignatures: pi⁴ *⁴ A-Y⁴ Z⁶ [2A]1.Includes bibliographical references and index.Relazione delle nave principale della sacrosanta Chiesa Papale Lateranense / dell'abate Alessandro Baldeschi -- Ristretto delle cose più notabili, che oggi si veggono ne' portici, nelle navi minori, e traversa, e nella tribuna della sacrosanta Chiesa Papale Lateranense / di Gio. Mario Crescimbeni.Mode of access: Internet.Binding: old vellum over boards; gilt red leather label on spine
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