1,720,986 research outputs found
Archeologia e impronte fossili nel sito acheuleano di Gombore II (0,85 Ma), Melka Kunture, Etiopia
No full textMelka Kunture is a cluster of prehistoric sites located on the shoulder of the Main Ethiopian Rift, at 2000
m asl. Tens of sites have been unearthed since the Sixties of last century, revealing a rich and persistent record,
anchored to a solid absolute dating system, starting at ca. 1.8 Ma. Here we report the discovery and
preliminary description of fossil footprints and trampled surfaces in the area of Gombore II, a well-known
Middle Acheulean site dated at ca. 0.85 Ma. Various species of mammals produced the footprints, that went
unnoticed at the time of previous research. They notably include a possible single Homo track. Footprints
are considered a snapshot in time of in situ frequentation, hence they help understanding the behaviour,
dynamics and association of animals and hominins. The ichnological data also allow comparisons with the
information produced by the archaeological and palaeontological record
Il Paleolitico superiore nei Colli Albani: stato della ricerca
No full textThe Upper Paleolithic in the Alban Hills: state of research. The evidence for the Upper Paleolithic in the Alban Hills is scarce and provided by surface collections and chance finds. Recent discoveries of complex artifacts wich probably had symbolic value have added novel perspectives and food for thought about Paleolithic occupation of the massif. This paper contextualizes and provides an overview of known and hitherto unpublished prehistoric finds in order to better define the dynamics of how the earliest anatomically modern humans frequented the area
The use of Raman spectroscopy for the characterization of archaeological ochre in the Upper Paleolithic of Colli Albani (Rome, Italy)
No full textCaracterización superficial de pigmentos sobre artefactos paleolíticos de la zona de Colli Albani (Roma, Italia) por microscopía óptica y espectroscopía Raman
No full textA Middle Pleistocene hippo tracksite at Gombore II-2 (Melka Kunture, Upper Awash, Ethiopia)
No full textIn this paper we describe exceptionally well-preserved evidence of hippo activity at Gombore II-2, a 700,000 year-old site at Melka Kunture, at 2000 m asl in the Ethiopian highlands, in the Upper Awash Valley. We excavated and made casts of footprints that had been left after a volcanic eruption. The 3D casts provide a detailed record of the outer anatomy and soft tissues of Pleistocene hippos. They reveal for the first time the shape of the legs and feet of the animals. Gombore II-2 also provides information on the behavior of past hippos. This prominent species of the African wildlife affects the vegetation and the landscape, and acts as a geomorphological agent. The animals wallow beside bodies of water and erode deep trails linking them to pastures. At Gombore II-2 the trampling marks converge toward an erosional feature that we interpret as a fossil trail, documenting an early Middle Pleistocene behavior similar to that of today. Signs of trampling and erosional features interpreted as hippo trails have also been described in Pliocene and early Pleistocene levels at Olduvai and Koobi Fora. We further underline that the hippo population of this tract of the valley was resilient and re-established itself not long time after the volcanic eruptio
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
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