1,720,958 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
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
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
Structural and chemical contrasts between prismatic and fibrous fluoro-edenite from Biancavilla, Sicily, Italy
No full textFluoro-edenite [NaCa2Mg5(Si7Al)O22F2], a new end-member of the calcic amphibole group, is present with both prismatic and fibrous morphologies in the altered volcanic products of the Monte Calvario locality, Biancavilla, on the flanks of Mount Etna, Sicily, Italy. Whereas the crystal chemistry of the prismatic variety was described recently, the fibrous variety has not been well characterized. We report original crystal-chemical and structural data on this fibrous amphibole. Because of the difficulty in analyzing this micrometric material, specific procedures of sample preparation were developed. SEM-EDS microanalyses and Mossbauer spectroscopy indicate a variable composition of the fibers, ranging mostly from fluoro-edenite to, subordinately, winchite, tremolite, and richterite compositions. Given the impossibility of using a single-crystal X-ray method, the powder-diffraction data were evaluated by the Rietveld method. By combining the microchemical data, Mossbauer Fe3+/Fe-tot, values, and with a refinement of the structure, the following chemical formula was obtained from an averaged composition of all the fibrous amphibole analyzed: (Na0.307K0.157)Sigma(0.464) (Ca1.505Na0.495)(Sigma 2.000) ((Al0.104Fe3+)-Al-VI Fe-0.333(2+) 0.162Mg4.255Ti0.062Mn0.063)(Sigma 4.980) ((Si7.520Al0.480)Sigma 8.000)-Al-IV O-22 (F1.970Cl0.020)(Sigma 1.990). The cell parameters, positional parameters for all the atoms, and site scattering for O3, M1, M2, M3, M4, A, and A(m) were refined. In agreement with the site occupancies of cations based on both XRPD and Mossbauer data, Fell was assigned to the M2 and M3 sites, and all Fe3+ was assigned to the M2 site. In particular, Fell content of each M2 site is far greater (0.125 apfu) than that of M3 (0.037 apfu). The analytical procedures utilized here can be adopted for all types of mineral fibers, whether they belong to the asbestiform group of amphiboles or not. In addition to their mineralogical interest, these results are also relevant for environmental and health aspects. The interactions between mineral fiber and the biological environment are strongly related to the crystal chemistry of the fibrous materials
Multi-analytical approach to crystal-chemical characterization of the fibrous fluoro-edenite amphibole from Biancavilla, Sicily, Italy.
No full textQuantitative chemistry and compositional variability of fluorine fibrous amphiboles from Biancavilla (Sicily, Italy)
No full textCompositional variability of the new fluorine fibrous amphiboles (fluoro-edenite) from the volcanic area of Biancavilla (Sicily, Italy) is reported here for the first time. Quantitative chemical analysis of a suite of four samples was performed by a standardized SEM-EDS microanalysis method, previously developed and tested on different typologies of fibrous amphiboles. The results highlighted compositional differences, especially concerning Si, Ca, Fe, and Na contents, both within the same and among the different samples. Compared to the previously investigated fluoro-edenite prismatic variety, the fluorine fibrous amphiboles showed average values of Si and Fe contents always higher, whereas Ca was significantly lower, which we consider a distinctive character for the fluorine fibrous variety. The Fe(3+)/Fe(tot) ratios, evaluated by Mossbauer spectroscopy, reflected different iron oxidation states: Fe(3+) was always more prevalent than Fe(2+), which was very low for two of the four samples analyzed. Employing the Leake classification, all the analyzed fluorine amphibole fibers showed an edenite-winchite trend, with a non negligible content of tremolite component. Both the fluorine amphibole fibers and the prismatic fluoro-edenite from Biancavilla may be correlated with the same genetic process, but the compositional variability reflect different growth conditions. The large variation observed for Fe(3+)/Fe(tot) ratios in the amphibole fibers is probably due to local variations of oxygen fugacity during crystallization. A workable hypothesis is that a hot metasomatizing fluid, enriched in fluorine and other incompatible elements, altered the volcanic rocks and caused the crystallization of either the fibrous fluorine amphiboles, by a very fast cooling, or the prismatic fluoro-edenite, by slow cooling
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