1,721,101 research outputs found
Comment on supposed holothurian body fossils from the middle Ordovician of Wales (Botting and Muir, Palaeontologia Electronica: 15.1.9A)
No full textLight and SEM study of body fossils from the Middle Ordovician of Wales recently described as the oldest articulated holothurians by Botting and Muir (Palaeontologia Electronica Article number: 15.1.9A) finds no traits that allow them to be assigned to the Echinodermata
Comment on supposed holothurian body fossils from the middle Ordovician of Wales (Botting and Muir, Palaeontologia Electronica: 15.1.9A)
No full textLight and SEM study of body fossils from the Middle Ordovician of Wales recently described as the oldest articulated holothurians by Botting and Muir (Palaeontologia Electronica Article number: 15.1.9A) finds no traits that allow them to be assigned to the Echinodermata
Morphology and ecological setting of the basal echinoid genus Rhenechinus from the early Devonian of Spain and Germany
No full textased on new material from Germany and Spain, the echinoid “Lepidocentrus” ibericus from the Early Devonian (Emsian) of northern Spain is shown to be congeneric with Rhenechinus from the Hunsrück Slate of south−western Germany. New information on the lantern, pedicellariae and internal structure of the theca is provided, and confirms this genus as a member of the Echinocystitidae–Proterocidaridae clade and the most primitive of all Devonian echinoids. The two environmental settings in which Rhenechinus is found are very different: the Spanish specimens come from a relatively shallow−water bryozoan meadow setting while the German specimens are preserved in a deep−water setting. We deduce that the rare echinoid specimens from the Hunsrück Slate are all allochthonous, whereas the Spanish material is preserved in situ
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
Soluta Jaekel 1901
No full textClass Soluta Jaekel, 1901 <p> <i>Remarks</i>.— Soluta is herein considered as a class of echinoderms following Noailles et al. (2014). Previous workers such as David et al. (2000) suggested they possess a feeding appendage in the form of a brachiole, whereas others like Smith (2005) thought they had a true arm. We consider solutans as distinct from any other blastozoan group because of the lack of radial symmetry, distinct oral area and absence of brachioles, and treat them as a plesiomorphic group of early pre-radial echinoderms according with Smith (2005, 2008). Antero-posterior orientation follows Caster (1968) with the homoiostele at the posterior pole. Rahman and Lintz (2012) in the description of <i>Dehmicystis</i> considered the thecal surface bearing the ambulacrum (and associated mouth) as the oral surface, with the opposite face as the aboral surface (as suggested by Kolata et al. 1977). This does not necessarily imply direct homologies with other echinoderms. Descriptive terminology follows a recent review by Noailles et al. (2014).</p>Published as part of <i>Zamora, Samuel & Gutiérrez-Marco, Juan Carlos, 2023, Filling the Silurian gap of solutan echinoderms with the description of new species of Dehmicystis from Spain, pp. 185-192 in Acta Palaeontologica Polonica 68 (2)</i> on page 187, DOI: 10.4202/app.01054.2023, <a href="http://zenodo.org/record/10981125">http://zenodo.org/record/10981125</a>
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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