1,721,038 research outputs found
What are these blades for? Flint blade production and circulation in the Final Neolithic Sardinia
No full textAt the end of the Neolithic (at the bridge between the 5th and 4th millennia BC), concurrently with the origin of the Ozieri Culture, obsidian was the most exploited lithic resource in Sardinia. During this time, the early stages of the obsidian reduction system seem to have been located in close proximity to the primary outcrops on the Monte Arci massif. In these areas, raw matter reduction was essentially addressed the creation of preforms of polyhedral cores for a blade production trajectory; the end products were distributed afterwards through organized exchange networks. In the same period, many flint sources were exploited but mainly at a local level. Yet, some other sources in the North Sardinia Oligo-Miocene basin of Perfugas (Anglona region) were exploited on a
supra-local scale, even in the first phase of the Ozieri culture (the first half of the 4th millennium). This good-quality material circulated in the form of long blades obtained especially by the pressure technique, even boosted by a long lever. Despite the wide availability of other good-quality raw materials, especially obsidian, these artefacts are made only of this quality of flint. The end of this production is still uncertain, but flint pressure blades were still in circulation at the end of the 4th millennium. Although multiple factors may explain this evidence, cultural and social explanations seem to be among the most relevant
Investigating Neolithic activities. The contribution of functional analysis to the reconstruction of settlements’ economy in Central-Southern Italy
No full textBetween the late 7th and early 6th millennium BC, the Neolithic era arrives in Southern Italy by sea with Eastern Mediterranean people. The external origin of the Neolithic seems to be supported by the presence of well-organized villages with an already fully productive economy and ceramic production since their first occupation.
Being part of a wider project on the Neolithization of Italy, this work presents the results obtained from the study of lithic assemblages from a selected number of Neolithic sites: Ripa Tetta (Puglia), Maddalena di Muccia (Marche), S. Stefano (Abruzzo).
Our analyses show how the techno-functional approach to lithic tools can play a significant role in the understanding of the economic and/or cultural choices made by Neolithic groups
Near Infrared imaging spectroscopy for raw materials characterization: the example of a Mesolithic dwelling site in Northern Sweden
No full textMOBIMA is a research project carried out at Umeå University which aims to develop non-destructive and image-based field techniques for chemical analysis. Within MOBIMA we test applications of Near Infrared imaging spectroscopy in archaeological research. A dataset of lithics from a dwelling site dated to mid-late Mesolithic at Lillsjön, Ångermanland, Sweden was analyzed using a sisuCHEMA pushbroom shortwave infrared hyperspectral imaging system (spectral Imaging Ltd, Oulu, Finland) for acquiring images from 1000 to 2498 nm at intervals of 6-7 nm. The spectral data were centered prior to principal component analysis and the Savitzky-Golay algorithm was applied for noise reduction. We could classify raw materials according to their spectral signature and ascribe objects to different types of quartz, quartzite, slate and flint. This preliminary study shows how Hyperspectral NIR (Near Infrared) imaging could be used in provenance studies as fast non-destructive screening method for characterizing raw materials
Settling a no-mans land. An up-dated rewiev on the peopling of northern Italy at the Last Glacial Maximum
No full textHuman occupation during the Last Glacial Maximum at the margins of and across the Great Adriatic Plain between Italy and the Western Balkans is an open question. Only a handful of archaeological sites compose a patchy archaeological record resulting, to some extent, in a lack of visibility of the peopling of the plain itself. A wide range of data from different sources are assimilated here to support the reconstruction of the physical and ecological settings. Contact between groups across the area is suggested by similarities in the chert and lithic industries in north-eastern and central-eastern Italy, Slovenia and Istria. On the north-eastern margin of the Po valley, in the Berici Hills, a string of caves and rockshelters with minimal archaeological remains have yielded lithic assemblages dominated by backed and/or shouldered projectile points. Fire-places, typological imbalance and impact-scars consistently suggest short-lived campsites and a restricted set of activities. Hunting parties focused on cave bears and possibly contributed to their population decline until extinction, in combination with climatic deterioration and resource competition. These sites may be all that is left of a complex settlement system, which once possibly stretched all over the plain, with centrally located sites now deeply buried, submerged and out of reach
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
Rebecca Dean
No full textDean, Rebecca M., and Antonio Faustino Carvalho. Surf and Turf: The Use of Marine and Terrestrial Resources in the Early Neolithic of Coastal Southern Portugal . In Trekking the Shore: Changing Coastline and the Antiquity of Coastal Settlement, edited by Nuno Bicho and Jonathan Haws, Loren G. Davis. New York: Springer, 2011.https://digitalcommons.morris.umn.edu/cosa2012/1017/thumbnail.jp
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
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