1,720,994 research outputs found
New insight into the Pleistocene deposits of Monte delle Piche, Rome, and remarks on the biochronology of Hippopotamus (Mammalia, Hippopotamidae) and Stephanorhinus etruscus (Mammalia, Rhinocerotidae) in Italy
Full text linkSeveral large mammal assemblages have been collected in the Roman basin since the XIX century, but they usually lack any stratigraphic datum or details about the fossiliferous localities. In this work, the stratigraphic provenance of large mammal remains discovered at Monte delle Piche (Rome) is investigated. The systematic revision of these specimens allows the recording of the presence of Hippopotamus sp., Stephanorhinus sp. and Stephanorhinus etruscus. On the basis of micropalaeontological analysis performed on sediment sampled from the studied specimens and considering the stratigraphy of the area, two fossiliferous levels are recognised at Monte delle Piche. The remain of the hippopotamus was collected in fluvial gravels and sand deposits, in which the presence of Cyprideis is also recorded. This deposit is chronologically related to the latest Early-early Middle Pleistocene. Hippopotamus was present in Italy and Western Europe from the latest Villafranchian to MIS 4/3. The mandible of S. etruscus was collected in marine deposits along with abundant foraminifera and ostracods, which correlate with the late Early Pleistocene. Stephanorhinus etruscus occurred in Western Europe at the beginning of the Villafranchian, and it was documented until the end of the Villafranchian in Italy and until the Early-Middle Pleistocene transition in the Iberian Peninsula
A miocene Aceratheriine rhinocerotid (mammalia, perissodactyla) from early pleistocene marine deposits at Monte delle Piche (Rome, central Italy)
No full textA fragmentary hemi-mandible of a rhinocerotid was collected during the end of the 19th century at Monte delle Piche (Rome). Morphological features, such as a short paralophid in the molar, the presence of a mesio-lingual cingulid in the teeth and a well-developed upturned I/2, indicate that the specimen belongs to Aceratheriini. In addition to other taxa (e.g. Chilotherium, Aceratherium and Hoploaceratherium), the hemi-mandible shows morphological traits suggestive of the genus Acerorhinus. The latter is well-documented in fossiliferous localities of Southeastern Europe, Turkey and China, chronologically related with the Land Mammal Zones MN 912. Unfortunately, the specimen is reworked in Early Pleistocene marine deposits. Hence, it cannot indicate the time at which the genus reached Italy
A miocene Aceratheriine rhinocerotid (mammalia, perissodactyla) from early pleistocene marine deposits at Monte delle Piche (Rome, central Italy)
No full textA fragmentary hemi-mandible of a rhinocerotid was collected during the end of the 19th century at Monte delle Piche (Rome). Morphological features, such as a short paralophid in the molar, the presence of a mesio-lingual cingulid in the teeth and a well-developed upturned I/2, indicate that the specimen belongs to Aceratheriini. In addition to other taxa (e.g. Chilotherium, Aceratherium and Hoploaceratherium), the hemi-mandible shows morphological traits suggestive of the genus Acerorhinus. The latter is well-documented in fossiliferous localities of Southeastern Europe, Turkey and China, chronologically related with the Land Mammal Zones MN 912. Unfortunately, the specimen is reworked in Early Pleistocene marine deposits. Hence, it cannot indicate the time at which the genus reached Italy
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
Morpho-sedimentary characteristics of the volcaniclastic apron around Stromboli volcano (Italy).
No full textVariations 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
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