1,721,006 research outputs found
HOLOCENE LANDSCAPE EVOLUTION OF THE AKSUM ARCHAEOLOGICAL AREA (TIGRAY, NORTHERN ETHIOPIA).
No full textSedimentology and tectonic evolution of selected Neogene-Quaternary basins of the Apennines (Italy)
No full textField Trip Guide Book P15, pp. 44. In: Guerrieri, L., Rischia, I. & Serva, L. (Series Eds). Field Trip Guide Books, 32nd International Geological Conference, Florence 20-28 Agosto 2004, Memorie Descrittive della Carta Geologica d'Italia, Vol. LXIII (4), from P14 to P36, APAT, Rom
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
Latest Pleistocene and Holocene river network evolution in the Ethiopian Lakes Region
No full textRiver network, geomorphologic, paleohydrologic, stratigraphic and sedimentologic analyses document a dramatic
reorganization of the drainage pattern in the northern part of the Main Ethiopian Rift (MER) during latest Pleistocene and early
Holocene. The river network modification was induced by tectonic deformation, volcanic activity, and by the arid conditions
connected with the Last Glacial Maximum (LGM). This arid phase triggered the shrinking of a Pleistocene Megalake that formerly
flooded large part of the Main Ethiopian Rift. The northern tributaries (paleo-Awash and paleo-Mojo rivers) extended, following
the lake shore retreat, and incised the Fesesa, Koye, and Cheleleka-Sulula Hafa paleovalleys through the Pleistocene deposits. At
the beginning of the Holocene, humid conditions induced a water-level rise in the lacustrine basin (Ziway–Shala basin), supplied
from the north by the large Awash–Mojo–Meki fluvial system. A well exposed cross-section of the Cheleleka paleovalley at the
confluence with the Meki River and the use of paleohydrological methods allowed to infer the bankfull paleo-discharge of the
larger Awash-Mojo river system. Tectonic events allowed the Awash and Mojo rivers to divert their courses to the east toward the
Afar depression, depriving the Ziway–Shala lacustrine basin of large volumes of water supply. This and the further increase in
aridity during the late Holocene led to the separation of the Ziway–Shala paleolake into the present four lakes (Ziway, Langano,
Abjiata, Shala). This study indicates that in the Main Ethiopian Rift, climatic changes cannot be inferred from lake-level variations
alone because changes in water supply are also influenced by the tectonic-induced rearrangement of the fluvial drainage networks.
© 2007 Elsevier B.V. All rights reserved
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
Latest Pleistocene and Holocene drainage network evolution in the Lakes Region, Ethiopia.
No full textThe study reports about the late Plieistocene-Holocene drainage changes that occurred in the Awash river system in relation with the recent tectonic evolution and the main Ethiopian rift valley lakes water level changes. The relative roles of climate change and tectonics are outlined
- …
