1,720,995 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
Sediment core description of gravity core GeoB23163-1 recovered during R/V Poseidon expedition POS499 at Sartori MV in the Calabrian Arc, Mediterranean Sea
No full textDuring R/V Poseidon expedition POS499, sediment core GeoB23163-1 (GC21) was collected with a gravity corer at the top of the Sartori Mud Volcano located in the Calabrian accretionary prism (Mediterranean Sea). The gravity core was recovered in a plastic foil, photographed and described on board. The gravity core is not stored in any core repository. To investigate lithological changes in more detail, macroscopic core description is prepared. The core description provides information about core length, position, water depth, core sections, core image, color, lithology, sedimentary structures and a descriptive text. Sediment color was determined qualitatively using Munsell soil color charts
Chloride and sulfate measurements of sediment core GeoB23163-1 from R/V Poseidon expedition POS499 on top of Sartori MV in the Calabrian Arc, Mediterranean Sea
No full textHere we present a dataset of pore water chloride and sulfate concentrations of gravity core GeoB21363-1 (GC21) recovered during R/V Poseidon cruise POS499 from the summit of Sartori Mud Volcano (Calabrian Arc, Mediterranean Sea). The gravity core was taken in a plastic foil. Pore water was extracted ex-situ from selected sediment depths on whole round plastic foil using disposable syringes and rhizon samplers. The sampling interval was set to 10 cm. The untreated pore water samples of filtered and unacidified aliquots were stored at 4°C until analysis. Concentrations of chloride and sulfate were analyzed by ion chromatography (IC) using a Metrohm 882 Compact Ion Chromatograph with an 858 Professional Sample Processor at MARUM. Uploaded chloride and sulfate concentrations are given in in Millimol/Liter (mmol/L). Sediment depth is given in meter (m)
Temperature measurements of sediment core GeoB23163-1 from R/V Poseidon expedition POS499 on top of Sartori MV in the Calabrian Arc, Mediterranean Sea
No full textHere we present a dataset of in-situ sediment temperatures of gravity core GeoB21363-1 (GC21) recovered during R/V Poseidon cruise POS499 from the summit of Sartori Mud Volcano (Calabrian Arc, Mediterranean Sea). In-situ temperature was measured using Miniaturized Temperature Data Loggers which were mounted on the core barrel of the gravity corer. In total, five loggers were used and measured temperatures in an interval of 0.5 up to 1 m. The gravity corer remained in the seabed for at least 10 minutes to obtain undisturbed temperature conditions of the seabed. Logger specific serial numbers are listed, penetration depth within the seafloor is given in meter (m) and in-situ temperature is given in Celsius (°C)
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
Sartori mud volcano in the Calabrian Accretionary Prism, Mediterranean Sea - Reconstruction of the past ~56 ka of mud extrusion activity
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