1,721,355 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
Characterization and ageing of medieval-like glasses for the Design of protective coatings
No full textGlass, compositionally similar to that of the medieval stained glass windows, was produced and\ud
characterized through a multi-technique approach to investigate the structural modifications induced by different\ud
amounts of potassium as flux, and their influence on the glass alteration processes.\ud
Ageing experiments were performed simulating separately the two mechanisms responsible for the glass\ud
alteration: leaching and dissolution. A clear relationship between the glass K-content and the degree of depolymerization\ud
of the silicate network was found through XRPD, FT-IR, and Raman spectroscopy analyses.\ud
Moreover the ageing experiments showed a correlation between the glass K-content and the alteration degree; in\ud
particular, it was observed that the most K-rich and depolymerized samples were also the most alterable.\ud
These structural studies were aimed to the design of water repellent protective coatings, matching the\ud
requirements of the Conservation of Cultural Heritage. Some hybrid sol-gel coatings, based on TEOS (Tetraethyl-\ud
orto-silicate), that guaranties the chemical and physical compatibility with the glass, and the organically\ud
functionalized Si-alkoxides, were prepared and characterized to obtain a good water repellency. Their\ud
performance was tested through accelerated ageing under UV-light and exposure to SO2-saturated atmosphere
ChileFjords18 Project: GIS database of glacial geomorphology between the Gran Campo Nevado and Estrecho de Magallanes, Chile
No full textThe data set encompasses a total of 4290 individual glacial geomorphic landforms and sediment associations covering an area of 1565 km2 in the Fjords of south-western Chile. The mapping was conducted using the following remote sensing data: Planet (2019), Sentinel-2 (2018), Bing & Google Earth 7.0. In addition 26 aerial photographs acquired through the Chilean aerial photograph service (SAF) were used for traditional stereoscopic analysis whilst certain locations were corroborated during field observations in November 2018. The ALOS Palsar DEM was used a as topographic base. The data set can be opened in GIS software.
The majority of mapping was conducted by Rodriguez, P.C. with site specific contributions using UAV video footage by Ferri, L. Geiger, A.J. supervised the mapping effort and checked specific landforms where doubts were raised by Rodriguez, P.C. and Ferri, L. This dataset forms the basis for the following publication:
Rodriguez et al. (2023) Glacial geomorphology between the Gran Campo Nevado and Estrecho de Magallanes, Chile (52-52°S, 73°W), Journal of Maps
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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