1,720,959 research outputs found
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
Morphodynamics and morphological changes of the last 50 years in a badland sample area of Southern Tuscany (Italy)
No full textThe purpose of this geomorphologic study was to analyse thc recent morphologic evolution of calanchi badlands over a SO years' period (1955-2006) and to evaluate the mean
erosion rate in areas situated in Southern Tuscany. These areas are characterised by Pliocene marine claystone which have undergone and continue to undergo erosion processes and a rapid morphologic evolution. Our morphodynamic investigation was based on systematic field surveys conducted over a 12 years' period (1994-2006) and photogeological analysis of a 30 km2 wide area. The systematic field surveys demonstrated that in the calanchi badland areas, erosion processes due to sheet-wash and channelled water act together gravitational processes, mainly represented by landslides and solifluction. Our research indicated that the effects of gravitational processes have increased over the last 10 years while sheet-wash action has been less intense over that same period. This is demonstrated by the progressive increase of flows at
the top of the calanchi badland slopes which determined the general rounding of sharp crests and the partial filling of several cuttings. In addition, our morphodynamic analys is strongly
suggests that anthropogenic action should not be overlooked or underestimated as a major force in shaping the landscape in the study area over the last so years. Quantitative evaluation
of the morphodynamic evolution based over a 50 years' period, was carried out in the "Torrente Cacarello" sample area, chosen as representative of the whole study area. The comparison
between 1955, 1976 and 2006 detailed geomorphologic maps (scale 1 :5,000), obtained from the aerial photographs and from the recent (2006) field survey, allowed us to estimate the
morphological differences which occurred in this period. Detailed analysis of the three geomorphological maps of the sample area obtained for eaeh peri od, were compared through a GIS software and enabled us to quantify the following different morphological processes that influenced the variation found in these areas: 1) the calanchi badland area increased over the
last 50 years; 2) mass movements prevail over sheet wash erosion; 3) calanchi badlands in their most recent morphological state are shaped by numerous scattered small landslides.
The geomorphological study in the sample area was completed by direct morphodynamic analysis: measurements of erosion were taken in order to quantify the mean erosion rate.
The sample area was monitored during the period JuI. OO-Jan. 06. Morphographic and morphometric analyses showed that the calanchi badlands are characterised by constant and quick shrinking of their edges eaused by landslides. Selected measurement stations located on slopes indicated an erosion rate ranging from 6 to 6.5 cm/y. The mean erosion rate measured in the sample area of this study was comparable to the mean crosion rate indicated in our earlier studies of neighbouring areas of Southern Tuscany; the mean erosion rate in both of these studies was significantly higher than those indicated by other authors who have studied ltalian badlands
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
Morphological analysis and erosion rate evaluation in badlands of Radicofani area (Southern Tuscany-Italy)
No full textSince 1988, geomorphologic research based on field surveys and photo-geological analysis, has been conducted in southern Tuscany (Italy), in areas characterised by very rapid morphological evolution. In the area outcrop Pliocene marine claystones uplifted during the Quaternary up to 750 m above sea level, now undergoing intense erosion processes, leading to considerable badlands formation. Morphodynamic analysis, conduced by direct and indirect measurements in a sample area, were taken in order to quantify the erosion rate in badland areas. The “Torrente Piantrafolla” sample area was chosen as representative of the study area; it was most recently monitored during the period Nov. 2000–Feb. 2004. At this time, morphographic and morphometric analyses carried out in selected measurement stations located on slopes, identified gravity as the main morphogenetic process responsible for slope shaping. The calanchi badland areas are characterised by constant and rapid shrinking of their edges resulting from landslides which occur in autumn and winter as a consequence of intense rainstorms. Selected measurement stations indicate an erosion rate value range from 5 to 7.5 cm/y. The comparison between 1976 and 1994 digital elevation models (DEM), obtained from photogrammetric restitution, indicated a mean erosion rate of about 5 cm/y in a nineteen year period. This value, considerably higher than the values measured in other Italian basins, indicate a very rapid evolution of the slopes, due mainly to small earth flows inside calanchi badlands
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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