1,720,956 research outputs found
LA SIMULAZIONE DELL'EVACUAZIONE DELLA POPOLAZIONE IN SITUAZIONI DI EMERGENZA CON IL SISTEMA HARIA 2
No full textSVILUPPO DELLA NUOVA MODELLISTICA PER LA SIMULAZIONE DI INCIDENTI INDUSTRIALI INSERITA NEL SOFTWARE HARIA 2, VERSIONE 3.0
No full textD'Auria F., De Pasquale F., De Varti A., Fruttuoso G., "OECD CSNI ISP 25, Achilles test A1B105: pre-test analysis performed at Pisa University by Relap5/mod2 code and comparison with experimental data, OECD CSNI Workshop on ISP 25, Winfrith (UK), Nov. 27-29, 1989
No full textThe document deals with the description of results obtained by the Relap5 code in the pretest-blind simulation of the reflood phase of a LOCA experiment performed in the Pressurized Water Reactor (PWR) experimental simulator Achilles installed at the Winfrith Research Center in United Kingdom. The Relap5 is the well-known computer code developed at Idaho National Laboratory in US: the code is in use at UNIPI since more than a decade. The Achilles loop is a Separate Effect Test Facility (SETF) simulating with full height (full pressure), full linear power a US type PWR. The concerned test was selected as International Standard Problem 25 (ISP 25) by OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Enrgy Agency / Committee on the Safety of Nucear Installations). The document describes the results of the pre-test calculation submitted (by UNIPI) to UKAEA (UK Atomic Energy Agency) before the execution of the test. This is called blind-pre-test analysis: the comparison of about 30 calculated time trends with measured data (once the experiment is performed: this is part of the ISP documentation issued as OECD report) allows an objective evaluation of the capabilities of the computer code and of the code user team in predicting the scenario of an accident. This is relevant for demonstrating the capabilities in evaluating safety margins of existing NPP, with main reference to PWR reflood (in this case)
Analysis of counterpart tests performed in BWR experimental simulators, OECD CSNI 2nd Workshop on ISP 21, Calci (I), Apr. 13-14, 1989
No full textFollowing the ISP [see below for acronyms] proposal made by UNIPI to OECD/NEA/CSNI in 1985[proposal given below under quotation] and the first ISP 21 Workshop held in Marina di Grosseto, 1986, the second and final Workshop for the international activity was held in Calci (Pisa geographical region) in 1989.
“The document deals with the proposal made by UNIPI to the OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Energy Agency / Committee on the Safety of Nuclear Installations) to perform an International Standard Problem (ISP), which was, later on, called ISP 21. This was at the time the first ISP proposed by Italian Institutions dealing with an Integral Test Facility (ITF). ISP 21 was a Small Break Loss of Coolant Accident (SBLOCA) scenario expected to occur in Boiling Water Reactors. One key feature of the proposed experiment was its Counterpart-Test feature which allowed the comparison with similar experiments performed in the FIST facility (available in US, San Jose, General Electric) and the ROSA-III facility (available in Japan at the JAERI research center of Tokai-Mura).
The proposal was accepted and the ISP activity went on in the period 1985-1989. (Later) comparison between experimental scenarios in the three ITF PIPER-ONE, ROSA-III and FIST largely contribute to addressing the scaling issue which was controversial in nuclear thermal-hydraulics.
PIPER-ONE was a Boiling Water Reactor (BWR) simulator installed at the Scalbatraio Laboratory managed by Dipartimento di Costruzioni Meccaniche e Nucleari (DCMN, now DICI) of University of Pisa.”
Four reports are part of this collection.
This report (3 of 4) discusses the differences between PIPER-ONE experimental data at the basis of ISP 21 and the experimental data of counterpart test performed in ROSA-III and FIST facilities in Japan and US, respectively.
The activity (among the other things) allowed UNIPI understanding of the capabilities of international Institutions in predicting accident scenarios in NPP
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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