1,721,602 research outputs found
Earthquake dynamics from pseudotachylyte microstructure
No full textData Repository for the production of Figure 3 and Table 1 of the manuscript "Earthquake dynamics from pseudotachylyte microstructure" by Aldrighetti S., Pennacchioni G. and Di Toro G
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
Effects of fluids on the seismicity of a fault. Analysis of exhumed structures in the Northern Adamello (Southern Alps, Italy)
No full textA comparison between two major cataclastic faults within the northern composite Adamello batholith (Southern Alps) is attempted. The two investigated faults have strike-slip kinematics and are related to the slip along the adjacent Tonale Line, a segment of the Periadriatic Lineament bordering to the north the Adamello. The exhumed fault sections were active 30Ma ago at 9-11km depth and 250-300°C ambient temperature. The Gole Larghe Fault Zone (GLFZ) has an E-W strike and cut across the Avio tonalites. The Passo Cercen Fault Zone (PCFZ) is located, a few kilometres north of GLFZ, within the Presanella pluton. Both faults consist of a swarm of subparallel green indurated cataclasites exploiting precursor sets of joints developed during the early stages of pluton cooling (PENNACCHIONI et alii, 2006); pseudotachylytes (frictional melts formed during coseismic slip on fault planes) are abundant along the PCFZ, but almost absent along the PCFZ. The field work arid the laboratory (geochemical and microstructural) analyses have highlighted the following main differences between the two faults: (i) Orientation: the PCFZ has direction N130°, almost parallel to the direction of the regional σ1 during the faulting; the GLFZ has orientation N105° and forms an angle of about 30° with σ1. (ii) Fault rocks: a) The GLFZ includes abundant pseudotachylytes, which are very rare along the PCFZ; b) Within the PCFZ, cataclasites are associated to diffuse macroscopic veins of epidote + Kfeldspar + quartz, which are rare along the GLFZ. Our hypothesis is that both faults were seismic (small amount of pseudotachylytes are present within the PCFZ), but processes inhibiting frictional melting were active along the PCFZ. The different orientation in the regional stress field determines a different component of normal stress on fault planes affecting the degree of fluid infiltration along the two fault zones. The orientation of the PCFZ to the regional stress field is favourable to exploitation of the precursor joints as hybrid mode of fractures. Hybrid shear-extensional fractures developing at depth of 9-11km imply high pore pressure and low differential stress; both factors act reducing the effective normal stress, and thus the shear strength along the fault planes. In condition of low shear strength, frictional heating is reduced; furthermore, fluid-rich conditions trigger processes such as fluid pressurization that inhibit frictional melting
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