1,721,009 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
Assessment of tectonic-controlled rock fall processes threatening the ancient Appia route at the Aurunci Mountain pass (central Italy)
No full textThis research addresses ongoing rock fall processes that affect the tract of the ancient Appia route crossing the Apennines at the Aurunci Mountain pass (central Italy). Elements of cultural heritage are endangered as calcareous blocks descending from the rock slope that delimits the route track were observed lying on the pavement. Based on cooperation between geologists and experts in remote sensing, a multi-disciplinary study was pursued to assess rock fall susceptibility. This study included aero-photogrammetric reconstruction of slope topography, field-based structural and kinematic analyses, terrestrial laser scanner and unmanned aerial system surveys and probabilistic rock fall modelling. This last was performed by simulating a large number of 3D trajectories and initially adopting a lumped mass approach, therefore tracking dimensionless rock blocks (kinematic modelling). The structural setting of the investigated rock slope shows evidence of four tectonic phases, including in chronological order folding, thrusting, strike-slip and normal faulting. Non-homogeneous joint sets distribution within the rock masses, due to the tectonic inheritance, was found to strongly condition rock failure mechanisms and sizes of detaching blocks. Different estimates of design rock block volumes and masses were integrated into kinematic modelling, finally achieving a dynamic 3D reconstruction of the rock fall process. Based on modelling results, a remediation plan has been drafted focused on positioning and sizing of elastic barriers
A note on DSR-like approach to space-time
No full textIn this Letter we discuss the possibility to define a space–time with a DSR based approach. We show that the strategy of
defining a non-linear realization of the Lorentz symmetry with a consistent vector composition law cannot be reconciled with
the extra request of an invariant length (time) scale. The latter request forces to abandon the group structure of the translations
and leaves a space–time structure where points with relative distances smaller or equal to the invariant scale cannot be
unambiguously defined
Caratterizzazione del sistema idrogeologico superficiale coltre piroclastica-substrato carbonatico nella dorsale dei Monti di Sarno (Campania)
No full textApproaching space-time through velocity in doubly special relativity
No full textWe discuss the definition of velocity as dE=d|p|, where E, p are the energy and momentum of a particle, in doubly special relativity (DSR). If this definition matches dx/dt appropriate for the space-time
sector, then space-time can in principle be built consistently with the existence of an invariant length scale.
We show that, within different possible velocity definitions, a space-time compatible with momentum-space
DSR principles cannot be derived
Caratterizzazione del sistema idrogeologico superficiale coltre piroclastica-substrato carbonatico nella dorsale dei Monti di Sarno (Campania)
No full textVariations 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
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