1,721,262 research outputs found
Electrostatic force and resolution of AFM cantilevers modelled by finite element analysis
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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
LES EXTREMES NIVOMETRIQUES DANS LES ALPES ITALIENNES : ANALYSE DES DONNEES DE DEUX STATIONS DU MONTE CANIN(ALPES IULIENNEES - FRIOUL) ET SITUATIONS SYNOPTIQUES RESPONSABLES DES CHUTES DE NEIGE
No full textExtreme snow levels in the Italian Alps. Analysis of data from two stations in Monte Canin (Julian
Alps - Frioul) and representative synoptic situations for snowfalls. The Julian Alps are the most important
"water castle" of the Italian territory; she’s are situated on the border with Slovenia and to be ready for about
50 kilometres’ with west-east direction, less than 60 kilometres’ from the coast of the Adriatic Sea. The
Mediterranean air masses, triggered by depressions positioned on the Atlantic or centred in the Genoa Gulf,
they will rise and determine heavy and recurring rainfall; very abundant throughout the year. From mid
November until the mid April, more than 1200 meters, the precipitation are almost exclusively snowy and the
snowfall are exceptionally heavy; so in Canin massif two glaciers are found and descending to 1900 meters
about. The notable thickness of snow to the ground and the prolonged snow cover favours a very long ski season
bath, at same time, determine a frequent releases of large avalanches, that is harmful to the tourism
Flusso vorticoso in un modello di canale curvo diffondente
No full textNel lavoro si presenta l'analisi sperimentale sul flusso vorticoso in un condotto costituito da un cono, una curva a 90° a sezione costante e un altro cono, condotto che vuole rappresentare una forma semplificata di un canale curvo diffondente del tipo di quelli installati allo scarico delle turbine idrauliche a reazione. Per un'analisi dettagliata sull'evoluzione del flusso nel condotto e per la valutazione dell'influenza dell'intensità di rotazione della vena si sono rilevati sperimentalmente, in diverse sezioni, i profili delle pressioni e delle velocità. L'analisi effettuata consente di valutare le prestazioni del condotto e di interpretare l'influenza su di esse dell'intensità di rotazione del flusso. In particolare si sono studiate le variazioni del coefficiente di recupero della pressione e del rendimento di conversione. Il confronto con altre geometrie precedentemente analizzate ha permesso di mettere in luce l'efficacia della diffusione dovuta al cono disposto a monte della curva
Note: Radiofrequency scanning probe microscopy using vertically oriented cantilevers
No full textWe present a simple method, based on the modification of a widespread atomic force microscope, that allows the simultaneous acquisition of the sample topography and RF spectra at the nanoscale minimizing the parasitic capacitance of the cantilever. We used a microcantilever set with its long axis perpendicular to the specimen surface and connected to a vector network analyzer (RF range 100 kHz-8.5 GHz) to measure RF impedance signal variations at the cantilever apex-sample interface. The RF impedance signal was found highly sensitive to very short probe-to-sample distances (<50 nm) and to material properties at the interface
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