1,721,071 research outputs found
L'Acquedotto Ostiense. Ricostruzione dell'antico percorso tra immagini iconografiche e rinvenimenti archeologici
No full textAgli inizi degli anni '90 del XX secolo, nella zona in prossimità del Casale di Malafede, sono stati rinvenuti e portati alla luce in più punti le strutture di due condutture che correvano uniti e in direzione parallela, considerati appartenenti all'antico acquedotto Ostiense che riforniva la città di Ostia.
Dai diversi rinvenimenti archeologici, avvenuti nel corso degli anni, é stato possibile stabilire la presenza di una complessa rete di approvvigionamento idrico che, alimentata dall'acquedotto Ostiense a partire dal fosso di Malafede, era funzionale sia all'uso agricolo sia a quello residenziale di tutto il territorio fino all' antica città di Ostia. Oggi tracce dell'antico acquedotto si possono scorgere lungo la via Ostiense, all'interno degli scavi dell'antica città di Ostia e nel circuito murario del Borgo rinascimentale, in cui vennero inglobate alcune arcate ancora oggi visibili sul lato orientale. Mediante l'analisi di fonti iconografiche, archivistiche e documentali, e rinvenimenti archeologici è possibile ricostruire il percorso dell'antico acquedotto e le interazioni con il tessuto urbano limitrofo
Il recente evento alluvionale del 4-5 maggio 1998 nel Sarnese e il deficit risolutivo della rete pluviometrica
No full textIl recente evento alluvionale del 4-5 maggio 1998 nel Sarnese e il deficit risolutivo della rete pluviometrica
No full textIFMIF Target Safety Concepts and Analysis
No full textUnder the auspices of the International Energy Agency (IEA) the conceptual design of an accelerator-based (D-Li) neutron irradiation facility to test and qualify fusion reactor materials has been completed at the end of 1996 by an international design team. A review of the conceptual design oriented to reduce technical risks and to complete the database for an engineering design has been recommended by IEA and is presently in progress. In the frame of this Conceptual Design Evaluation (CDE) phase (1997-98), an activity aimed at deeping the safety analysis of the Li-target system has been carried out. An integrated safety analysis methodology has been developed in order to identify and quantify the specific events that could occur during the operation and could cause environmental hazards. This methodology includes: 1) Safety analysis of lithium target system and its support systems: this analysis has been performed to identify the relevant target related hazards and the major initiating events of accident sequences; 2) Dependent failure analysis, which has been finalised to investigate all failures that could increase the unavailabilities of a function; 3) Accident sequence analysis, which has been fulfilled to identify and quantify the accident sequences that could occur during normal plant operation. With relation to the probabilistic evaluation of the accident sequences concerning the target facility and the support/interfacing systems the methodology and the calculation tool adopted are respectively the fault tree and event tree technique, widely utilized in PRA (Probabilistic Risk Assessment) studies, and the RISK SPECTRUM code, a PC software package for system risk and reliability analysis. The results obtained from the probabilistic evaluation indicate that the frequencies/probabilities of occurrence of the most dangerous accident sequences, i.e. involving the backwall rupture, are very low
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
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
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