1,721,100 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
METODOLOGIE SUBACQUEE PER LO STUDIO DELLA VARIAZIONE ANNUALE DEI FLUSSI BENTICI E DEI NUTRIENTI (N, SI, PI) IN ACQUE COSTIERE (GOLFO DI TRIESTE, NORD ADRIATICO)
No full textThe scuba-diving sampling method was used in the northern Adriatic during the last two years (1992-1993). Benthic fluxes of dissolved N, Si, P nutrients, and alkalinity, dissolved inorganic C (DIC) and O 2 where misured monthly over 16 months periods from sediments in the Gulf of Trieste, using direct sampling and laboratory incubated flux chambers at in situ temperature. The experiments were performed in the dark since previous studies showed the important utilization of released nutrients by benthic microalgal mat. The estimated yearly average fluxes were: O 2 =-19.3±8.2, DIC=13.7±9.6, NO 3 =-0.04±0. 16, NH 4 =0.3±0.4, P04 =-0.001±0.01, Si =0,9 ± 1.1 mmol m-2 d-1 , showing strong temporal fluctation.
The highes effluxes of all nutrients and DIC were observed in the summer period but small DIC efflux ang NH4 , Si and P04 influxes in the late winter. Only NH4 (ca 50%) and Si (ca 70% ) fluxes were significantly direct temperature dependent.
This suggests that the rate of downward input and quality of sedimented organic matter (autochtonous and allochtonous) were superimposed on the temperature fluctation. High DIC, NH4 and Si effluxes observed in Ma y 1993 during low temperature was due to degradation of sedimented organic matter produced by early spring microphytobenthonic bloom about 6 weeks before while the autumn phytoplanktonic bloom was simultaneously reflected in enhanced benthic fluxes due to higher temperature. The nutrient fluxes observed were not significant l y linked to O 2 consumption suggesting that also anaerobic oxidation processes were important at the sediment-water interface in the Gulf
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
Modelling cell populations with spatial structure: Steady state and treatment-induced evolution of tumour cords
No full textA general expression for sequential DNA-fluorescence histograms.
No full textA general expression for time sequences of DNA-fluorescence histograms from flow microfluorometry is given in this paper. Such expression is given in terms of the law of DNA growth along S phase, the flux of cells into S, and the efflux out of M. Special conditions of growth (e.g. the exponential steady-state growth), and the case of blocks in S phase are also analyzed. Some simulations of the expressions obtained are presented
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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