273 research outputs found
Website for Cesare Zavattini’s Works: Digitizing and Dynamizing a Personal Audiovisual Archive:
No full textDigitization has been changing the methods of production, distribution and use of written and audiovisual products, according to a process of “platformization” (Van Dijck, Poell, de Waal 2018). Following the “network society” model (Castells 1996), platforms, as creative ecosystems (Montanari 2018) and medial ecosystems (Pescatore, Innocenti 2011), have introduced a new mindset that connects producers and consumers within a digital environment, breaking down space-time barriers, controlling data and simplifying the supply chain (Nasta and Pirolo, 2017). So even the audiovisual field has undergone a transition to companies with a service provider role, following a user-based model that feeds different forms of participation and spreadability through intermediality and storytelling (Abercrombie and Longhurst, 1998; Jenkins, Ford, Green 2013).The project of digitization of written material of the Zavattini Archive (Biblioteca Panizzi, Reggio Emilia) starts from a productive theoretical (and methodological) intersection between platform design and game design. As we will see, the paradigm shift that platform design has brought resembles certain characteristics of the “play” experience. The concepts of collaboration and intermediation lead to a rethinking of users as pivotal and at the centre, not only regarding their user experience (as in certain types of digital games) but also in the production of various types of content (as in platforms), leading to asynchronous collective experiences, whether they are related to gaming or to participating in platforms.La numérisation a modifié les modes de production, de distribution et d'utilisation des produits écrits et audiovisuels, selon un processus de « plateformisation » (Van Dijck, Poell, de Waal 2018). Suivant le modèle de la « société de réseaux » (Castells 1996), les plateformes, en tant qu'écosystèmes créatifs (Montanari 2018) et écosystèmes médiaux (Pescatore, Innocenti 2011), ont introduit un nouvel état d'esprit qui relie producteurs et consommateurs au sein d'un environnement numérique, sans barrières temporelles, avec le contrôle des données et la simplification de la chaîne d'approvisionnement (Nasta et Pirolo, 2017). Ainsi, même le domaine audiovisuel a connu une transition vers des entreprises ayant un rôle de fournisseur de services, suivant un modèle basé sur l'utilisateur qui alimente différentes formes de participation et de diffusion à travers l'intermédialité et la narration (Abercrombie et Longhurst, 1998 ; Jenkins, Ford, Green 2013). Le projet de numérisation du matériel écrit des archives Zavattini (Biblioteca Panizzi, Reggio Emilia) part d'une intersection théorique (et méthodologique) productive entre la conception de plateformes et la conception de jeux. Comme nous le verrons, le changement de paradigme apporté par la conception des plateformes ressemble à certaines caractéristiques de l'expérience de « jeu ». Les concepts de collaboration et d'intermédiation conduisent à repenser les utilisateurs comme pivots et au centre du projet, non seulement dans leur expérience utilisateur mais aussi dans la production de divers types de contenus, conduisant à des expériences collectives asynchrones, qu'elles soient liées au jeu ou à la participation à des plateformes.La digitalizzazione ha cambiato le modalità di produzione, distribuzione e fruizione dei prodotti scritti e di quelli audiovisivi, attraverso un processo di “piattaformazione” (Van Dijck, Poell, de Waal 2018). Seguendo il modello della “società delle reti” (Castells 1996), le piattaforme, intese come "ecosistemi creativi" (Montanari 2018) ed "ecosistemi mediali" (Pescatore, Innocenti 2011), hanno introdotto una nuova mentalità che collega produttori e consumatori all'interno di un ambiente digitale, scomponendo le barriere spazio-temporali, usando per il controllo i big data e semplificando la filiera (Nasta e Pirolo, 2017). Così anche il settore audiovisivo ha subito una transizione verso aziende con ruolo di service provider, seguendo un modello user-based che alimenta diverse forme di partecipazione e diffusione, attraverso l'intermedialità e lo storytelling (Abercrombie e Longhurst, 1998; Jenkins, Ford, Green 2013). Il progetto di digitalizzazione del materiale scritto dell'Archivio Zavattini (Biblioteca Panizzi, Reggio Emilia) parte da un produttivo incrocio teorico (e metodologico) tra platform design e game design. Come vedremo, il cambiamento di paradigma che il design della piattaforma ha portato ricorda alcune caratteristiche dell'esperienza di "gioco". I concetti di collaborazione e intermediazione portano a un ripensamento degli utenti come cardine del progetto, non solo per quanto riguarda la loro user experience (come in certi tipi di giochi digitali), ma anche nella produzione di vari tipi di contenuti (come nelle piattaforme), che portano a esperienze collettive asincrone, siano esse legate al gioco o alla partecipazione alle piattaforme
The 26 year-long X-ray light curve and the X-ray spectrum of the BL Lacertae object 1E 1207.9+3945 in its brightest state
No full textAims:We studied the temporal and spectral evolution of the synchrotron emission from the high energy peaked BL Lac object 1E 1207.9+3945.
Methods: Two recent observations have been performed by the XMM-Newton and Swift satellites; we carried out X-ray spectral analysis for both of them, and photometry in optical-ultraviolet filters for the Swift one. Combining the results thus obtained with archival data we built the long-term X-ray light curve, spanning a time interval of 26 years, and the Spectral Energy Distribution (SED) of this source.
Results: The light curve shows a large flux increasing, by about a factor of six, in a time interval of a few years. After reaching its maximum in coincidence with the XMM-Newton pointing in December 2000 the flux decreased in later years, as revealed by Swift. The very good statistics available in the 0.5-10 keV XMM-Newton X-ray spectrum reveals a highly significant deviation from a single power law. A log-parabolic model with a best fit curvature parameter of 0.25 and a peak energy at ~1 keV describes well the spectral shape of the synchrotron emission. The simultaneous fit of Swift UVOT and XRT data provides a milder curvature (b ̃0.1) and a peak at higher energies (~15 keV), suggesting a different state of source activity. In both cases UVOT data support the scenario of a single synchrotron emission component extending from the optical/UV to the X-ray band.
Conclusions: New X-ray observations are important to monitor the temporal and spectral evolution of the source; new generation γ-ray telescopes like AGILE and GLAST may for the first time detect its inverse Compton emission
Long-term wind-driven X-ray spectral variability of NGC 1365 with Swift
No full textWe present long-term (months–years) X-ray spectral variability of the Seyfert 1.8 galaxy NGC 1365 as observed by Swift, which provides well-sampled observations over a much longer time-scale (six years) and a much larger flux range than is afforded by other observatories. At very low luminosities, the spectrum is very soft, becoming rapidly harder as the luminosity increases and then, above a particular luminosity, softening again. At a given flux level, the scatter in hardness ratio is not very large, meaning that the spectral shape is largely determined by the luminosity. The spectra were therefore summed in luminosity bins and fitted with a variety of models. The best-fitting model consists of two power laws, one unabsorbed and another, more luminous, which is absorbed. In this model, we find a range of intrinsic 0.5–10.0 keV luminosities of approximately 1.1–3.5 erg s?1, and a very large range of absorbing columns, of approximately 1022–1024 cm?2. Interestingly, we find that the absorbing column decreases with increasing luminosity, but that this result is not due to changes in ionization. We suggest that these observations might be interpreted in terms of a wind model in which the launch radius varies as a function of ionizing flux and disc temperature and therefore moves out with increasing accretion rate, i.e. increasing X-ray luminosity. Thus, depending on the inclination angle of the disc relative to the observer, the absorbing column may decrease as the accretion rate goes up. The weaker, unabsorbed, component may be a scattered component from the wind
High-dose chemotherapy (HDT) with tandem autologous peripheral blood cells (PBPC) transplantation for patients with metastatic breast cancer (MBC)
No full textInterim analysis of the Grocta 8 adjuvant trial in breast cancer patients with ten or more involved nodes
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Testing the gamma-ray burst variability/peak luminosity correlation on a Swift homogeneous sample
No full textWe test the gamma-ray burst (GRB) correlation between temporal variability and peak luminosity of the γ-ray profile on a homogeneous sample of 36 Swift/Burst Alert Telescope (BAT) GRBs with firm redshift determination. This is the first time that this correlation can be tested on a homogeneous data sample. The correlation is confirmed, as long as the six GRBs with low luminosity (<5 × 1050 erg s-1 in the rest-frame 100-1000 keV energy band) are ignored. We confirm that the considerable scatter of the correlation already known is not due to the combination of data from different instruments with different energy bands, but it is intrinsic to the correlation itself. Thanks to the unprecedented sensitivity of Swift/BAT, the variability/peak luminosity correlation is tested on low-luminosity GRBs. Our results show that these GRBs are definite outliers
An ASIC front-end for fluorescence and Cherenkov light detection with SiPM for space and ground applications
No full textAstroparticle and High Energy Astrophysics space missions measuring extensive air showers produced by cosmic rays and neutrinos in atmosphere require detection of very faint and intense ultraviolet and visible light. Characteristics of the new generation of SiPM (Silicon PhotoMultiplier) are potentially right for this purpose. The capability to operate SiPM contemporarily in photon counting and in charge integration is strictly dependent indeed by the design of the front-end electronics (FEE). In this context, the challenge is to find the right balance and a feasible solution for managing SiPM with a FEE to be able to work, contemporarily and efficiently, in photon counting and charge integration. In this manuscript we present a new ASIC, named RADIOROC, that is an improvement of the CITIROC and that is at the end of its design phase: this chip will be able to work contemporarily in both the named modes. The RADIOROC characteristics and the first simulations carried out on the chip design will be presented
Swift XRT observations of the breaking X-ray afterglow of GRB 050318
No full textWe report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and UVOT for 11 consecutive orbits starting from 54 min after the trigger. A previously unknown fading X-ray source was detected and accurately monitored. The source was found to decrease in intensity with time and a clear temporal break occurring at ~18 000 s after the trigger was observed. The X-ray light curve was found to be consistent with a broken power-law with decay indices -1.17± 0.08 and -2.10+0.22-0.24 before and after the break. The spectrum of the X-ray afterglow was well described by a photoelectrically absorbed power-law with energy index of -1.09±0.09. No evidence of spectral evolution was found. We compare these results with those obtained with UVOT and separately reported and refine the data analysis of BAT. We discuss our results in the framework of a collimated fireball model and a synchrotron radiation emission mechanism. Assuming the GRB redshift derived from the farthest optical absorption complex (z = 1.44), the event is fully consistent with the Ep-Eiso correlation
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