1,720,965 research outputs found
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
Structural and electronic characterization of Pb adsorption on clean and Cr or Ni doped Fe(1 0 0) surface: An ab-initio study
Full text linkUsing ab-initio calculations, the interaction of lead adatom on both the clean and doped iron (100) surfaces has been investigated. The adsorption energies show that the hollow site provides a more stable configuration with respect to the top and bridge sites, and, in this position, the lead adatom is more energetically favourable than the iron adatom. On the other hand, lead adsorbed in the hollow site of the iron (100) surface doped with chromium, provides more stable system than the nickel doped surfaces with an iron atom adsorbed in the same position. Detailed investigations of inter-layer distances, bonding mechanisms in terms of the projected density of states, magnetic behaviours, and charge density differences are also presented. Our results give insights in the role of the doping the interaction between lead adatom and iron surface, and then, this study may be exploited in the analysis of the corrosion process due to liquid lead
Convenzione "CTBT" tra il Ministero degli Affari Esteri e l'ENEA - Rapporto periodico III-2019 (01/07/2019-30/09/2019)
No full textL’Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA) e il Ministero degli Affari Esteri e Cooperazione Internazionale (MAECI) collaborano ai fini degli adempimenti previsti dalla legge 15 dicembre 1998, n. 484, così come modificata dalla L. 24 luglio 2003 n. 197, per la ratifica e l’esecuzione del Trattato per il Bando Totale degli Esperimenti Nucleari (CTBT, Comprehensive Nuclear-Test-Ban Treaty), con protocollo e annessi, adottato a New York dall’Assemblea Generale delle Nazioni Unite il 10 settembre 1996. Nell’ambito del Centro Nazionale Dati (NDC), il ruolo dell’ENEA consiste nel fornire supporto tecnico all’Autorità Nazionale nella verifica dell’applicazione del CTBT. Per quanto riguarda il Sistema Internazionale di Monitoraggio (IMS), l’ENEA è responsabile dell’analisi dei dati provenienti dalla rete di rilevamento di radionuclidi (particolato e gas nobili), che è una delle quattro tecnologie utilizzate per la verifica e l’unica in grado di fornire elementi di certezza sul fatto che un test nucleare sia avvenuto o meno. Il MAECI e l’ENEA hanno collaborato su queste tematiche tramite apposite convenzioni, di cui l’attuale è entrata in vigore in data 1° gennaio 2019. Il presente documento rappresenta il terzo rapporto periodico del 2019 e descrive lo stato di avanzamento delle attività previste dalla convenzione nel periodo 01/07/2019 - 30/09/2019
Convenzione “CTBT” tra il Ministero degli Affari Esteri e l’ENEA – Rapporto periodico IV-2019 (01/10/2019-31/12/2019)
No full textL’Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA) e il Ministero degli Affari Esteri e Cooperazione Internazionale (MAECI) collaborano ai fini degli adempimenti previsti dalla legge 15 dicembre 1998, n. 484, così come modificata dalla L. 24 luglio 2003 n. 197, per la ratifica e l’esecuzione del Trattato per il Bando Totale degli Esperimenti Nucleari (CTBT, Comprehensive Nuclear-Test-Ban Treaty), con protocollo e annessi, adottato a New York dall’Assemblea Generale delle Nazioni Unite il 10 settembre 1996. Nell’ambito del Centro Nazionale Dati (NDC), il ruolo dell’ENEA consiste nel fornire supporto tecnico all’Autorità Nazionale nella verifica dell’applicazione del CTBT. Per quanto riguarda il Sistema Internazionale di Monitoraggio (IMS), l’ENEA è responsabile dell’analisi dei dati provenienti dalla rete di rilevamento di radionuclidi (particolato e gas nobili), che è una delle quattro tecnologie utilizzate per la verifica e l’unica in grado di fornire elementi di certezza sul fatto che un test nucleare sia avvenuto o meno. Il MAECI e l’ENEA hanno collaborato su queste tematiche tramite apposite convenzioni, di cui l’attuale è entrata in vigore in data 1 gennaio 2019. Il presente documento rappresenta il quarto rapporto periodico del 2019 e descrive lo stato di avanzamento delle attività previste dalla convenzione nel periodo 01/10/2019 - 31/12/2019
Siler project: Design of the seismic isolators
No full textThis paper describes the SILER (Seismic-Initiated event risk mitigation in LEad-cooled Reactors) Project results obtained so far in the design of the seismic isolation system of two nuclear power plants: the ELSY configuration for the LFR (Lead-Cooled Fast Reactor) design and the MYRRHA configuration for the accelerator-driven systems (ADS). The seismic protection of the nuclear buildings by means of seismic isolation has been chosen in order to minimize changes to the standard design of the civil works and internal components of the Nuclear Power Plant. The work led to the identification of the optimal design solution, in terms of type and location of seismic devices, to achieve compliance to the floor response acceleration spectra in horizontal and vertical direction, with levels of horizontal displacements not exceeding the maximum acceptable values for structural and non-structural elements. The isolators studied in the project are of the type elastomeric, both High Damping Rubber Bearings and Lead Rubber Bearings; moreover the adoption of a fail-safe system to limit the horizontal isolator deformation in case of beyond design earthquakes is studied
Future development of global molybdenum-99 production and saving of atmospheric radioxenon emissions by using nuclear fusion-based approaches
No full textTechnetium-99m, the decay product of molybdenum-99, is the most used medical isotope in diagnostic imaging. The future disruptions of molybdenum-99 supply, due to the final shut down of some old producing reactors, has led some current global supplies to plan the expansion of their production capacity. While other countries are developing own production facilities to supply their domestic demand. The global increase of molybdenum-99 production in the coming years could increase by about five times the current demand, with about the 50 percent of additional production in North America. Xenon radionuclides are an inevitable by-product of the nuclear plants production, and their periodically release into the atmosphere, contribute to the background that is also revealed by the IMS stations of the CBTO treaty. In this framework, the development of new technologies, posing no risk in relation to nuclear proliferation and do not result in emissions of radioxenon, could mitigate the issues related to the forecast increase of molybdenum-99 production worldwide. In Italy, an alternative 99Mo production project, the project ENEA Sorgentina, based on the irradiation of molybdenum by neutrons produced by a deuterium-tritium nuclear fusion process, is under development. This facility will not release radioxenon into the atmosphere, so it will not affect the background value in the atmosphere in Southern Europe
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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