1,721,202 research outputs found
Il Cispio e le sue adiacenze in età antica. Storia urbana e analisi topografica di un settore dell'Esquilino
Full text linkLa ricerca è stata avviata col fine di analizzare la topografia storica di uno dei settori della città antica meno conosciuti: il Cispio. Ci si è così proposti di restituire la storia urbana di una delle aree di Roma che, a causa di una marginalità evidente all’interno delle fonti letterarie risulta tra le più neglette negli studi contemporanei. A livello metodologico si è operato distinguendo tre differenti livelli: analitico, sintetico e interpretativo.
Nella struttura della ricerca si è imposta una qualche ridondanza nella organizzazione e nell’analisi delle fonti disponibili, interrogandole sulle diverse tematiche affrontate e riarticolandole secondo prospettive interpretative differenti. La natura stessa del dossier non ha consentito, infatti, una narrazione continua e cronologicamente ordinata, a cui si è così rinunciato. La raccolta dei dati ha mirato a ricostruire ogni ritrovamento occorso lungo la superficie del Cispio, confluito poi nella carta archeologica, che costituisce la parte catalogica di questo lavoro.
Ad un livello successivo, quello di sintesi, si è scelto di esaminare ogni tematica topografica sotto una duplice prospettiva quella delle fonti archeologiche e quella delle fonti scritte, cercando in questo modo sia di distinguere il più possibile la lettura dall’interpretazione, sia di valorizzare un dossier di sua natura poco “parlante”.
Sono state così affrontate problematiche quali la toponomastica e la topografia, le suddivisioni dello spazio urbano, la viabilità e gli spazi pubblici e i luoghi di culto nell’ambito delle fonti scritte. Per quelle archeologiche, invece, si sono esaminate le dinamiche dello sviluppo pre-urbano, il tessuto insediativo, la viabilità e, seppur brevemente, l’analisi dei reperti mobili.
Un apposito spazio, inoltre, è stato dedicato alla complessa problematica della localizzazione del tempio di Giunone Lucina sul Cispio, di fatto il solo edificio che le fonti antiche situano con certezza sul mons. La proposta di localizzazione, ottenuta tramite l’analisi integrata del dossier archeologico con quello letterario ed epigrafico, si è giovata in gran parte della ricerca archivistica sopramenzionata. Si è tentato comunque, per quanto possibile, di restituire un quadro e un areale accettabile per la localizzazione del luogo di culto, e successivamente indagare le distinte possibilità, avanzando una proposta specifica.
Infine, ad un ultimo livello più interpretativo si sono analizzate le problematiche di storia urbana dell’area. In questo senso, proprio a causa della limitatezza delle fonti letterarie disponibili il lavoro si è giovato del dossier epigrafico per approfondire il paesaggio religioso e la storia sociale del quartiere. Sulla prima tematica, sostanzialmente limitata alla festività dei Matronalia ci si è proposti di chiarire la ritualità connessa alla celebrazione delle feste in onore della dea, al suo contesto storico ed alle vicende connesse alla fondazione del tempio, tra le più dibattute nella storia degli studi. Sulla storia sociale del quartiere è stata indagata e verificata la presenza di specifiche forme di sociabilità connessa alla eventuale caratterizzazione “professionale” di alcune aree del Cispio. Contestualmente si è cercato di comprendere e ricostruire la presenza di memorie di famiglie nella toponomastica, ed infine, di tracciare un quadro degli abitanti del quartiere, provando a riconoscerne le abitazioni e analizzando i caratteri specifici del popolamento.
L’obiettivo finale è stato quello di colmare un vuoto nella storia urbana della città antica, cercando di comprendere l’area nella sua integrità e il complesso sistema di fonti ad essa associate
Disegni inediti di pavimenti antichi da Villa Casali sul Celio. Le riproduzioni ottocentesche di Enrico Calderari conservate all'Archivio di Stato di Roma
No full textIn this paper we discuss the discovery of a series of six drawings related to floor and wall decorations – preserved in the State Archives of Rome – which, due to complex archival vicissitudes, had been believed lost. The six watercolour plates, drawn by Enrico Calderari, constitute the only graphic testimony of an excavation carried out in 1824 in the Villa of the Marquis Casali on the Caelian hill, previously known through a short report by Giuseppe Valadier. Thus, the discovery permits to submit the graphic and descriptive documentation, finally reunited. The first plate depicts the general layout of the excavation, where it is possible to recognise a corridor, whose floors are decorated with black and white geometric mosaics, and a colonnaded entrance hall decorated with opus sectile. The plates II, III and IV are devoted to the detailed illustration of tessellated that adorned the hall; plate V portrays the wall decoration of the colonnade room with marble incrustationes; the last plate shows the opus sectile floor of the same room. The latter in particular is a rare example of sectile “in a square pattern with complex motifs” with the basic outline of the Q(XP) type, highlighting the importance of the discovery of Calderari’s drawings
The Asiago-ESO/RASS QSO Survey. I. The Catalog and the Local QSO Luminosity Function
Full text linkThis paper presents the first results of a survey for bright quasars (V30°. The photometric database is derived from the Guide Star and USNO catalogs. Quasars are identified on the basis of their X-ray emission measured in the ROSAT All-Sky Survey. The surface density of quasars brighter than 15.5 mag turns out to be (10+/-2)×10-3 deg-2, about 3 times higher than that estimated by the PG survey. The quasar optical luminosity function (LF) at 0.04<z<=0.3 is computed and shown to be consistent with a luminosity-dependent luminosity evolution of the type derived by La Franca & Cristiani in the range 0.3<z<=2.2. The predictions of semianalytical models of hierarchical structure formation agree remarkably well with the present observations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The probabilistic random forest applied to the selection of quasar candidates in the QUBRICS survey
Full text linkThe number of known, bright (i 2.5) QSOs in the Southern hemisphere is considerably lower than the corresponding number in the Northern hemisphere due to the lack of multiwavelength surveys at δ 2.5 QSOs. The performances of the PRF, currently comparable to those of the CCA, are expected to improve as the number of high-z QSOs available for the training sample grows: results are however already promising, despite this being one of the first applications of this method to an astrophysical context
First identification of direct collapse black hole candidates in the early Universe in CANDELS/GOODS-S
Full text linkThe first black hole seeds, formed when the Universe was younger than 500 Myr, are recognized to play an important role for the growth of early (z ~ 7) supermassive black holes. While progresses have been madein understanding their formation and growth, their observational signatures remain largely unexplored. As a result, no detection of such sources has been confirmed so far. Supported by numerical simulations, we present a novel photometric method to identify black hole seed candidates in deep multiwavelength surveys. We predict that these highly obscured sources are characterized by a steep spectrum in the infrared (1.6-4.5 μm), i.e. by very red colours. The method selects the only two objects with a robust X-ray detection found in the CANDELS/GOODS-S survey with a photometric redshift z 6. Fitting their infrared spectra only with a stellar component would require unrealistic star formation rates (≥2000M⊙ yr-1). To date, the selected objects represent the most promising black hole seed candidates, possibly formed via the direct collapse black hole scenario, with predicted mass 105M⊙. While this result is based on the best photometric observations of high-z sources available to date, additional progress is expected from spectroscopic and deeper X-ray data. Upcoming observatories, like the JWST, will greatly expand the scope of this work
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The QUBRICS Survey
No full textFinding the brightest QSOs at high-z is important both for constraining cosmic evolution and fundamental physics. However, in the Southern Hemisphere, the number of bright QSOs is still relatively scarce. The advent of recent databases, including SkyMapper, Gaia, DESI, offers a golden opportunity to fill in this gap. The QUBRICS survey (QUasars as BRIght beacons for Cosmology in the Southern hemisphere) has been active since 2019, exploiting these databases through machine learning techniques (e.g. CCA, PRF, XGB) and so far over 400 new, bright (i 2.5) QSOs have been spectroscopically confirmed. In this poster we highlight some of the multiple scientific applications enabled by such a dataset like (i) improving the estimate of the luminosity function; (ii) analyzing absorption features along the line of sight and (iii) improving the performance of the selection algorithms. In the future, QSOs confirmed by this survey will be the targets of subsequent studies using higher resolution spectrographs like MIKE, ESPRESSO, WINERED and will be prime targets for foreground galaxy redshift surveys with LLAMAS
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