1,721,004 research outputs found
Quality Plan for the EFDA task: Implications on RPrS writing of an increase in the ITER first wall fluence and of an "all tungsten machine".
No full textThe document presents the Quality Plan related to the EFDA Task TW6-TSS-SEA4.1: “Implication on RPrS writing of an increase in the ITER first wall fluence and of an all tungsten machine”.
The draft of this document has been presented during the Task Kick-off meeting held in Bologna (Italy) on August 8, 2007.
The Quality Plan follows the specification given in the EFDA document EFDA/QA/AQA, Rev.1, 15 May 2007: Appendix QA –Management General Requirements (for ITER related tasks)
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
ASDEX Upgrade operating experience: statistical analysis on ECRH system failure
No full textThe study is set in the frame of an overall activity for collection and analysis of data coming from existing experience in different fusion machines. Particularly, in Europe, JET, Tore Supra and ASDEX Upgrade (AUG) facilities have been investigated.
This Report is dedicated to statistical analysis on failures occurred operating the AUG electron cyclotron resonance heating (ECRH) system. Information on failures have been collected by AUG team. The ENEA deliverable was dedicated to perform statistical evaluations on data collected.
Mean Failure Probabilities on Demand have been evaluated for the single gyrotrons, the two AUG ECRH groups (a couple of gyrotrons) and globally for the overall AUG ECRH system
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
JET data collection on component malfunctions and failures of Ion Cyclotron Resonant Heating ICRH system
No full textThe overall objective of this task of JET Fusion Technology Task Force is to develop a fusion specific data collection (i.e. component failure database) with data coming out from operating experiences gained in the Joint European Torus (JET). The activity is related to JET Ion Cyclotron Resonance Heating (ICRH) system and it is the extension of the previous activities, which interested firstly Vacuum and Active Gas Handling systems, then the Coil and NBI Power Supply system.
Alarms/Failures and malfunctions occurred in the years of operations from March 1996 to November 2005, including information on failure modes and, where possible, causes of the failures, have been identified. Moreover, also data related to crowbar events have been collected.
About 3400 events classified as alarms or failures related to specific components or sub-systems were identified by analysing the 25 hand-written logbooks made available by the ICRH operating staff.
Information about the JET pulses in which the ICRH system was operated have been extracted from 20 hand written tick sheets covering the period from March 1996 to middle May 2003 and electronic tick sheets covering the period from May 2003 to November 2005. It results that the ICRH was operated during about 12000 plasma pulses.
Main statistical values, such as rates of alarms/failures and corresponding standard errors and confidence intervals, have been estimated. Failure rates of systems and components have been evaluated both with regard to the ICRH operation pulses and operating days (days in which at least one ICRH module was requested to operate). Failure probabilities on demand have been evaluated with regard to number of pulses operated.
The Report is issued with Four Appendixes (A, B, C and D). The Appendix A is dedicated to general data collection, classification and summary statistical analysis at ICRH system and ICRH module level; the Appendix B is dedicated to details on failure data (based on data collected from ICRH logbooks); the Appendix C is dedicated to detailed statistical and Reliability analysis from both at ICRH system level, down and at ICRH component/part level; the Appendix D gives the full list of data collected from the ICRH logbooks and tick sheets. The Appendixes A, B and C are distributed together with the Report, while the Appendix D will be distributed in a restricted form to people directly involved in JET operations. People interested in Appendix D can ask authors or EFDA CSU at JET
DATA COLLECTION ON COMPONENT MALFUNCTIONS AND FAILURES OF JET ICRH SYSTEM
No full textThe objective of the activity was to collect and analyse data coming out from operating experiences gained in the Joint European Torus (JET) for the Ion Cyclotron Resonance Heating (ICRH) system in order to enrich the data collection on failures of components used in fusion facilities
Summary on collection and analysis of component failure data from fusion machine system operating experience
No full textThe present report gives a summary of data collection, analyses and reliability parameters related to failures occurred in fusion machines, with emphasis on the Joint European Torus (JET) operation experience. Data from the Tritium Laboratory of FZK Karlsruhe TLK were also collected and analysed.
Those activities were done, from 2001 to 2006, in the frame of the EFDA JET Fusion Technology tasks (JWO-FT-5.4, JW3-FT-5.13, JW5-FT-5.19) of the European Fusion Technology Programme.
The JET the data collection and the corresponding reliability analyses were related to the Vacuum System (VS), the Active Gas Handling System (AGHS), the Neutral Beam Injectors system (NBI), the Power Supply system (PS), and the JET Ion Cyclotron Resonant Heating system (ICRH).
Several thousands of components have been considered, in total, with their corresponding operation life. Few hundreds of failures/malfunctioning related to those components have been identified and classified. Data collection was based on a number of sources specific to the plant, including: operation records (e.g. electronic database, hand-written logbooks), incident investigation reports, maintenance and repair records/database, annual and technical reports, and plant personnel interviews.
Reliability parameters such as failure rate and failure probability on demands, with the corresponding standard error, lower and upper limits of the 90% confidence interval, have been calculated. As a result of the work, practical information arisen from the experience gained operating the different systems, were get out too.
More details about the overall activity are included in various ENEA reports and papers, listed in references of this report.
Statistical data are recorded on the “Fusion Component Failure Rate Database”, that is included in the frame of the International Energy Agency (IEA) Agreement on the Environmental, Safety and Economic Aspects of Fusion Power (IEA ESE), precisely, under Task 5 of the IEA ESE
The work was possible thank to the strong collaboration with the staffs of the different JET systems considered and the TLK and to the support of the EFDA-CSU
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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