1,720,973 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
Data for: Multiphysics analysis of the MSFR helium bubbling system: a comparison between neutron diffusion, SP3 neutron transport and Monte Carlo approaches
No full textNeutron diffusion, SP3 neutron transport and Monte Carlo approache
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
Modelling and assessment of the release of gaseous and volatile fission products from oxide fuel
Full text linkLAUREA MAGISTRALEIl comportamento dei prodotti di fissione gassosi e volatili è di importanza cruciale nella valutazione della radioattività potenzialmente emessa da un impianto nucleare di potenza. Attualmente è possibile valutare il termine di sorgente, cioè la quantità di radioattività interna ad un reattore che potentialmente ne può fuoriuscire, grazie alla metodologia ANS 5.4. Questa, se accoppiata ai rendimenti isotopici di fissione, permette di calcolare l'attività di gap, cioè l'inventario di isotopi radioattivi che si accumulano nell'intercapedine della barra di combustibile e che in presenza di fratture possono contaminare il fluido termovettore. ANS 5.4 viene usato per calcolare il rilascio frazionario degli isotopi radioattivi di interesse radiologico dal combustibile nucleare. Vale a dire quelli gassosi e volatili, con emivita sufficientemente breve (minore di un anno). Le predizioni dei rilasci frazionari della metodologia ANS 5.4 sono spesso conservative. Rispetto database di validazione, il modello sovrastima le misure di almeno un'ordine di grandezza, conseguentemente alle ipotesi presenti nel modello. La metodologia ANS 5.4 è stata sviluppata per reattori in condizioni stazionarie.
Per questo motivo non dovrebbe essere applicata a condizioni incidentali che coinvologono variazioni improvvise di temperatura. In questo lavoro la descrizione intra-granulare è stata migliorata. L'ipotesi di stazionarietà è stata rimossa sviluppando un risolutore spettrale per l'equazione di diffusione-decadimento. Il risolutore è stato implementato nel codice SCIANTIX, e la sua consistenza è stata verificata grazie al metodo della soluzione manufatta (MMS). La descrizione inter-granulare di ANS 5.4 è basata su una correlazione empirica che modellizza la saturazione delle bolle a bordo grano ed il conseguente rilascio. Tale correlazione, nota come soglia di Vitanza, dipende dai valori di temperatura e bruciamento del combustibile. La soglia di Vitanza è stata sostituita da un modello meccanicistico per l'evoluzione delle bolle a bordo grano. Tale modello include i fenomeni di crescita delle bolle, coalescenza, interconnessione e successivo rilascio di prodotti di fissione. Nell'ultima fase di validazione, il risolutore spettrale completo di descrizione intra- e inter-granulare è stato impiegato per simulare i test VERCORS. Questi test sono rappresentativi di condizioni incidentali. In particolare, variazioni improvvise di temperatura tipiche nei LOCA con conseguente rilascio di radioattività.
Il modello risulta in grado di predire i rilasci frazionari dei prodotti di fissione volatili con errori inferiori all'1%. In aggiunta il modello riesce a fornire una descrizione conservativa della cinetica rilascio, durante tutto il transitorio.The subject of the present work concerns the modelling and assessment of radioactive gaseous and volatile Fission Products (FPs). These are of primary importance in radiological risk analysis and licensing process of a Nuclear Power Plant (NPP). The state-of-the-art methodology available to evaluate the source term, that is the amount of radioactive material which can leakage from the reactor containment, is the American Nuclear Society (ANS) Method for Calculating the Fractional Release of Volatile Fission Products from Oxide Fuel, ANS 5.4. If coupled with isotopic yields, it provides the gap activity, namely the inventory of radioactive gaseous and volatile FPs that are released from the fuel rod if the cladding is breached. The output of ANS 5.4 is the fractional release of radioactive isotopes from the fuel. The ANS 5.4 predictions for fractional release, with respect to the validation database, are higher of at least one order of magnitude, as a consequence of the basic assumptions of the model. ANS 5.4 methodology has been developed for stationary conditions of the reactor. Therefore, it should not be applied to accidents which involve abrupt temperature variations. In this work, the stationary hypothesis of the reactor has been circumvented by developing a spectral solver for an improved intra-granular diffusion-decay problem, able to describe transient conditions. The spectral solver has been integrated in the 0D meso-scale code SCIANTIX and verified via Method of Manufacture Solutions (MMS), a technique for testing the consistency of numerical algorithms. This step is fundamental in Verification and Validation (V&V) framework. At inter-granular level, bubble interconnection and subsequent release is described in ANS 5.4 through an empirical correlation, the Vitanza threshold, function of fuel burnup and temperature. The replacement of the Vitanza threshold with a physics-based model constitutes a substantial improvement for inter-granular description. Such a model has been integrated in the spectral solver in order to consider inter-granular bubble growth, coalescence, interconnection and release, through a set of evolutionary equations. The complete spectral solver for intra- and inter-granular description has been implemented in SCIANTIX. A validation of the model has been carried out against fractional release measurements obtained during VERCORS tests, a set of out-of-pile experiments representative of transient Loss Of Coolant Accident (LOCA) conditions. The results obtained confirm that the improved model is able to predict the global fractional releases of gaseous and volatile FPs during accident conditions. In addiction, the model is able to provide a conservative description of the release kinetics throughout the transient phase
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
