1,721,208 research outputs found
The floods of 13-16 October 2000 in Piedmont (Italy): quantitative precipitation estimates using radar and a network of gages
No full textSource of variation of linear type traits evaluated on italian heavy draught horse breed
No full textNonlinear Viscous Symmetric Circulation: the Mechanism of Stabilization
No full textThis paper presents the analysis of symmetric circulations
of a rotating baroclinic flow, forced by a steady
thermal wind and dissipated by Laplacian friction. The analysis
is performed with numerical time-integration. Symmetric
flows, vertically bound by horizontal walls and subject
to either periodic or vertical wall lateral boundary conditions,
are investigated in the region of parameter-space
where unstable small amplitude modes evolve into stable stationary
nonlinear solutions. The distribution of solutions in
parameter-space is analysed up to the threshold of chaotic
behaviour and the physical nature of the nonlinear interaction
operating on the finite amplitude unstable modes is investigated.
In particular, analysis of time-dependent energyconversions
allows understanding of the physical mechanisms
operating from the initial phase of linear instability to
the finite amplitude stable state. Vertical shear of the basic
flow is shown to play a direct role in injecting energy into
symmetric flow since the stage of linear growth. Dissipation
proves essential not only in limiting the energy of linearly
unstable modes, but also in selecting their dominant spacescales
in the finite amplitude stage
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
Gli strumenti conservati presso l'antico laboratorio di fisica dell'Università di Urbino
No full textXXVI Congr. Nazion. AIF (Bellaria, 1987), i
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