1,720,966 research outputs found
Natural environment and cultural landscape in the ancient Roman harbours (Tiber delta area, central Italy)
No full textThe sediments recovered from the Republican harbour of Ostia and from the Imperial harbour of Portus in the Tiber delta area (Rome, central Italy, Fig. 1) have been the subject of multidisciplinary analyses involving, among others, stratigraphy, palynology, ostracodology, geochemistry. The purpose of the study is investigating the natural environment and the cultural landscape in a marginal area such a river delta in an area under the influence of either climate/environmental changes or human impact.
The river port of Ostia, according to the legend founded by Ancus Marcius (VII cent. BC), became insufficient for the Roman Empire. Therefore in 42 AD the Emperor Claudius built a northernmost basin and then Emperor Trajan expanded it, excavating an artificial basin, because the Claudius basin was prone to rapid silting. The area, once the port was abandoned evolved in an unhealthy swamp. Nowadays, due to the delta advancing, Trajan basin is a small lake, some kilometres far away from the coast.
The sediments from Ostia (Republican – Renaissance age) were used to localize the ancient port. Pollen and ostracods have been useful to reconstruct water and terrestrial environments (1). The cores from the Claudius and Trajan harbour area form a composite record spanning from the early Imperial period to present. A mosaic of different environments followed one each other and the sediments recorded also particular events such as the catastrophic Renaissance (2,3) Tiber floods and different reclamation works.
This is the first continuous composite record spanning more than two millennia in the region of Rome.The sediments recovered from the Republican harbour of Ostia and from the Imperial harbour of Portus in the Tiber delta area (Rome, central Italy, Fig. 1) have been the subject of multidisciplinary analyses involving, among others, stratigraphy, palynology, ostracodology, geochemistry. The purpose of the study is investigating the natural environment and the cultural landscape in a marginal area such a river delta in an area under the influence of either climate/environmental changes or human impact.
The river port of Ostia, according to the legend founded by Ancus Marcius (VII cent. BC), became insufficient for the Roman Empire. Therefore in 42 AD the Emperor Claudius built a northernmost basin and then Emperor Trajan expanded it, excavating an artificial basin, because the Claudius basin was prone to rapid silting. The area, once the port was abandoned evolved in an unhealthy swamp. Nowadays, due to the delta advancing, Trajan basin is a small lake, some kilometres far away from th
Archaeobotanical investigations at the imperial harbour of Rome
No full textRemnants of the ancient harbour of rome are located in the tiber delta area 3.5 km away from the present coastline. it was the main rome maritime port from the middle of the first century to Late antiquity. in 42 ad, emperor Claudius started the excavation of the harbour. then, the emperor trajan added to the former construction, which had gradually silted up, a hexagonal basin in an inner position. the objective of this multidisciplinary study was to reconstruct the plant cultural landscape in the harbour applying detailed pollen, microcharcoal, and plant macroremains recovered from two cores (Pts5 and Pts13) drilled in the area of the Claudius harbour. the chronological framing of the records is based on stratigraphical criteria, radiocarbon dates, archaeological and historical data. the two cores record different periods of time. one core shows the first phases of the harbour activities, with a plant landscape typical of a coastal environment. the other one records a stronger human impact related to the presence of Portus town and of medieval settlements. anthropogenic pollen indicators (sensu behre and Jacomet 1991) as well as strong fire use/occurrence were increasing in the first centuries ad. these results will be completed with new core data from the extant trajan lake, granting the possibility to study a record spanning the last two millennia
Febbraio- dicembre 2014, seminario permanente Roma Tevere Litorale.
No full textL'embouchure du Tibre avec l'Isola Sacra (photo Talavan) ROMA, TEVERE, LITORALE - 3000 ANNI DI STORIA, LE SFIDE DEL FUTURO SEMINARIO PERMANENTE I incontro – 26 febbraio. Ecole Française de Rome, piazza Navona, 16-18.30 Geoarcheologia dell’area del delta L. Sadori, I. Mazzini, J.-P. Goiran Evoluzione paleoambientale di aree archeologiche nel Delta del Tevere: strumenti e dati per valutare l'impatto antropico e sviluppo naturale F. Salomon, J.-P. Goiran, J.-P. Bravard, P. Bell..
Febbraio- dicembre 2014, seminario permanente Roma Tevere Litorale.
No full textL'embouchure du Tibre avec l'Isola Sacra (photo Talavan) ROMA, TEVERE, LITORALE - 3000 ANNI DI STORIA, LE SFIDE DEL FUTURO SEMINARIO PERMANENTE I incontro – 26 febbraio. Ecole Française de Rome, piazza Navona, 16-18.30 Geoarcheologia dell’area del delta L. Sadori, I. Mazzini, J.-P. Goiran Evoluzione paleoambientale di aree archeologiche nel Delta del Tevere: strumenti e dati per valutare l'impatto antropico e sviluppo naturale F. Salomon, J.-P. Goiran, J.-P. Bravard, P. Bel..
Paleonviroment in the ancient roman harbours area (Tiber delta, central Italy), Interdisciplinary meeting on climate change and seismic hazards during the Holocene in the Mediterranean
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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
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