1,720,977 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
Sediment yield for erosion evaluation in a small Apennine watershed, and location of sediment sources through the use of the USLE model and of air photo interpretation.
No full textSediment yield for erosion evaluation in a small Apennine watershed, and location of sediment sources through the use of the USLE model and of air photo interpretation.
D. Pavanelli, A. Bigi, M. Rigotti
Corresponding Author: D. Pavanelli, Dipartimento di Economia ed Ingegneria Agrarie, Università di Bologna, V.le G. Fanin 50, 40127 Bologna, Italy. Tel:+39 051 2096168, Fax:+39 051 2096171, E-mail: [email protected]
Soil erosion in the Apennines is quite a relevant issue, being a cause of land degradation and reducing the land available to farming. Mountain areas abandonment worsened landscape situation, because of the lack of erosion direct and indirect control.
Estimates of soil erosion activity in a mountain basin are usually made with a significant degree of uncertainty, because usually few data are available to calibrate erosion models or to directly estimate eroded soil amount, thus leading to inability of taking decision in conservation policies.
In order to evaluate the suspended sediment yield (SSY) carried by the Gaiana torrent, a ~9 km2 basin in the Bologna Apennines, we applied a very simple linear model previously built on a geomorphologically similar watershed nearby, which has a very large SSY dataset. This model estimates average SSY from the maximum rainfall intensity on a storm event basis: the simplicity of the model allowed its application on scarcely gauged basins, where precipitation is the main erosive agent, giving reasonable estimates of soil loss.
According to the philosophy behind this approach, we applied the USLE model to the Gaiana catchment, in order to have a further estimate of the order of magnitude of the sediment yield and to test our methodology. We also realized a chart of geomorphology and soil erosion by air photo interpretation, in order to be able to locate the source areas of sediment production. Furthermore, a river monitoring station along with a water samples has been installed at the Gaiana basin outlet. The few collected data since December 2004 have been employed to further verify the linear model efficiency. GIS analysis has been fundamental for extracting USLE factor from the digital elevation model of the basin, and to analyse vegetation cover and geomorphology of the Gaiana basin, as well as for air photo elaboration
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
Congenital hypertrophy of the retinal pigment epithelium (CHRPE) and familial adenomatous polyposis (FAP)
No full textFamilial adenomatous polyposis (FAP) is a genetically transmitted disease affecting the colon. It is characterized by the presence of several (at least 100) adenomatous polyps, each able to develop into carcinomas, and by other extra-colonic signs such as skin and bone lesions. Within the framework of research studies to identify phenotyphic markers for early detection of subjects at risk within a family affected by FAP, attention has recently been paid to congenital hypertrophy of the retinal pigment ephitelium (CHRPE). With the aim of evaluating the relationship between FAP and CHRPE, 36 members of 7 FAP families were examined. We found that 43.75% of the subjects presenting CHRPE areas were also affected by FAP, whereas 58.33% of patients affected by FAP had CHRPE. Our findings indicated a lower incidence of CHRPE in FAP patients, compared to other studies reported so far. Moreover, in a control group of 160 healthy individuals we found a CHRPE prevalence of 5.5%
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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