1,720,977 research outputs found
Sharks, rays and skates (Chondrichthyes, Elasmobranchii) from the Upper Marine Molasse (middle Burdigalian, early Miocene) of the Simssee area (Bavaria, Germany), with comments on palaeogeographic and ecological patterns
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Pseudorhinobatos Marramà & Carnevale & Naylor & Varese & Giusberti & Kriwet 2021
No full textGENUS † PSEUDORHINOBATOS Zoobank registration: urn:lsid:zoobank.org:act: 75367FF8-9DCA-406F-B257-8A34595CE1BF Type species: Trygonorhina dezignii Heckel, 1853. Etymology: After the Ancient Greek ψεῦδος (pseudos), false, and Rhinobatos, one of the living rhinobatid genera, therefore remarking their apparent similarity; gender masculine. Diagnosis: A rhinobatid guitarfish characterized by a wedge-shaped pectoral disc, longer (44.8% TL) than wide (38.5% TL); head length (from snout to scapulocoracoid) 29.8% TL; tail length (from pelvicfin origin to the posteriormost tip) 56% TL; pelvic-fin length 17.8% TL; snout to pelvic-fin origin 44.8% TL: well-developed lateral skin folds extending along the lateral margins of tail; rostral cartilage about 65% of neurocranial length; no horn-like processes on nasal capsules; 42 nasal lamellae; nuchal cartilages absent; anteriormost synarcual centrum located near the midlength of the synarcual; 118–138 vertebral centra, of which 18 monospondylous, and 100–120 diplospondylous; about 20 rib pairs; propterygia extending close to the margins of the pectoral disc; first propterygial segment not reaching the level of nasal capsules; propterygial radials extending as far as nasal capsule level; 60–62 pectoral-fin radials, of which 30–32 propterygial, seven to nine mesopterygial, one to two neopterygial, 20–22 metapterygial; about 21 pelvic-fin radials; closely arranged, small dermal denticles forming a continuous and regular covering on the ventral side of the body; denticle crown smooth, rhomboidal or lozenge in shape; thorns completely covering the dorsal side of the body; thorns of globular or arrow shape with prominent ridges; teeth extremely small (up to 750 µm); crown low, not globular; lingual visor slightly convex; regular central lingual uvula with apices rounded and not enlarged; two very incipient, not divergent, lateral lingual uvulae; labial apron absent; transverse keel separating the crown into labial and lingual faces, and forming a wide obtuse angle in lingual view; enameloid surface completely smooth; holaulacorhizid root bilobed, wide, displaced lingually, not broader or higher than the crown; root lobes triangular in shape in basal view, with regular, not undulated margins; lobes separated by a marked and deep furrow exhibiting a single central nutritive foramen; two additional foramina on lingual root face; low collar on upper part of the root stem.Published as part of Marramà, Giuseppe, Carnevale, Giorgio, Naylor, Gavin J. P., Varese, Massimo, Giusberti, Luca & Kriwet, Jürgen, 2021, Anatomy, taxonomy and phylogeny of the Eocene guitarfishes from the Bolca Lagerstätten, Italy, provide new insights into the relationships of the Rhinopristiformes (Elasmobranchii: Batomorphii) in Zoological Journal of the Linnean Society 19
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Lamniform vertebrae from the Aptian-Albian Marne a Fucoidi of Umbria-Marche Domain (Central Italy)
No full textThe elasmobranch fossil record is essentially represented by isolated teeth due to high fossilization potential of hard dental components. Conversely, the cartilaginous skeletal elements, even though mineralized, are less prone to survive to the biostratinomic and diagenetic processes with negative implications in our understanding of the evolution of the elasmobranch skeletal anatomy. Even if fossil shark taxonomy is almost based on tooth characters, fossil vertebrae can provide useful information concerning the age, ontogenetic stage, and total length of the individual, along with crucial taphonomical and paleoecological information. In the present contribution we report and describe the first occurrence of lamniform vertebrae from the Cretaceous of the Umbria-Marche Domain (Central Italy), from the Aptian–Albian Marne a Fucoidi cropping out at Mt Nerone (Umbria-Marche Ridge, Northern Apennines, Italy). Although the material is solely represented by ten vertebrae (four found semi-articulated), the presence of well-calcified, amphicoelous, and slightly dorso-ventrally compressed centra having notochordal spaces constricted and reduced to intervertebral lenses confidently support their attribution to the group of lamniform sharks. In addition to taphonomic considerations, we have tried to provide a possible age for the individual and to estimate the minimum total length for the entire body. Based on the general morphology of the centra, size and annual growth bands, the preserved material can be referred to a small-medium sized fusiform and pelagic lamniform shark, with a body length reaching not less than 1.59 m, and being characterized by an approximately sub-circular trunk area, and a moderately fast swimming and consistent maneuverability. Considering the relative scarcity of shark vertebral remains in the fossil record, the material described herein represents an important source of information for the paleobiology of the Umbria-Marche Domain of Central Italy during the Cretaceous period.Fil: Romano, Marco. Università degli studi di Roma "La Sapienza"; ItaliaFil: Citton, Paolo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Cipriani, Angelo. No especifíca;Fil: Fabbi, Simone. No especifíca;Fil: Spanò, Ferdinando. Università degli studi di Roma "La Sapienza"; ItaliaFil: Marramà, Giuseppe. Università di Torino; ItaliaFil: Carnevale, Giorgio. Università di Torino; Itali
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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