1,721,000 research outputs found
Thermal characterization of organic matter along a (hypothetical) coalification gradient
No full textThermal characterization of organic matter along a (hypothetical) coalification gradient
No full textFish otoliths from the pre-evaporitic (Early Messinian) sediments of northern Italy: their stratigraphic and palaeobiogeographic significance
No full textThe study of otolith assemblages from the preevaporitic
Messinian deposits allows the reconstruction of a
fauna of 79 taxa of which 35 could be identiWed at the speciWc
level. Three of these are new: Diaphus rubus, Myctophum
coppa, and Uranoscopus ciabatta. The assemblages
reXect mainly a neritic environment inXuenced by the oceanic
realm. Analysis of the global present-day geographic
distribution of 42 of the recognised Messinian genera indicates
that 88% of these are still living in the Mediterranean,
98% in the Atlantic and 78% in the Indo-PaciWc realm.
These results are in good agreement with the evolutionary
trends documented for the Oligocene and Miocene teleost
fauna, speciWcally an increase in percentage of genera
inhabiting the modern Mediterranean, a very high percentage
of Atlantic and Indo-PaciWc genera, and a slight fall of
the importance of present-day Indo-PaciWc genera from the
Rupelian up to the Late Miocene. Analysing the composition
of the Early Messinian fauna at the level of nominal
species indicates that about 53% of the species represented
in the assemblages are still living in the Recent Mediterranean,
and that a signiWcant number of these were already
present in the Tortonian. It is interesting that these species
are mainly neritic. This seems to conWrm that the close
aYnity of the fossil assemblage with the present-day Mediterranean
neritic fauna, which was already recorded at the
genus level for the Rupelian fauna, persists during the Neogene
and continues until the Pleistocene
A new look to Prolagus (Ochotonidae, Lagomorpha) from the late Messinian of Ciabòt Cagna (Piedmont, NW Italy)
No full textCiabòt Cagna (Piedmont, NW Italy) is a post-evaporitic Messinian fossiliferous locality. According to the literature, in Ciabòt Cagna was recorded the ochotonid Prolagus michauxi, but the present revision led to: 1) ascribe it to Prolagus sorbinii, a species present since the beginning of Messinian in continental Italy; 2) exclude a W Europe immigration source of ochotonids into continental Italy during Messinian; 3) and modify the geographical range of P. sorbinii and P. michauxi, which boundary should be W Alps
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
- …
