1,721,000 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
Dante «iuxta Sarnj fluenta»: a proposito dell’epistola a Moroello e della canzone ‘montanina’
No full textRapporti tra epistola e canzone; problemi di carattere ermeneutic
Concordanze, capovolti, emblemi: sul Dante di Mario Apollonio
No full textIl saggio analizza la critica dantesca di Mario Apollonio con specifico riferimento al 'Dante' vallardiano, individuando in concordanze, capovolti ed emblemi il nucleo 'analogico' dell'interpretazione della Commedia proposta dal grande critico lombard
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
Calculated electron affinities and redox E° values of polypyridinic derivatives
No full textQuantum mechanical based ab-initio calculations are used to compute one-electron electrochemical standard reduction potentials, E-0, for a set of 12 polypyridinic derivatives (plus nitrobenzene and benzophenone as reference compounds) in dimethylformamide solution. Linear relationships between theoretical predictions and experimental data are constructed and provide a mean unsigned error of about 0.19 V. It is shown that the theoretical approach allows us also to discuss structural features related to the electron transfer process, like conformational changes found between the neutral and radical anion species (for instance, in the case of 4-4 ́dipyridyl a variation is found from 36degrees to almost zero of the ring-ring dihedral angle and a shortening of the single C-C bond when passing from the neutral to the radical anion). Also the weight of different terms (mainly: electron affinity, solvation Gibbs energies, DeltaG(0) of the 1/2 H-2(g), H-aq(+) + e(-) half-cell reaction) leading to the determination of E-0 is assessed on a quantitative basis
Una storia sbagliata. Su Pasolini e Dante
No full textSi esaminano le varie suggestioni dantesche che operarono su Pasolini, il suo ‘dantismo’ medesimo, con speciale riguardo all'ultimo lavoro, il primo pubblicato dopo la morte, "La Divina Mimesis", opera di esplicita ispirazione dantesca
Synthesis of variously 1,8-naphthyridine derivatives and evaluation of their antimicobacterial activity
No full textA series of 1,8-naphthyridine derivatives variously substituted in the 2, 3, 4 and 7 positions were synthesized for in vitro evaluation of antimycobacterial activity in accordance with an international program with the tuberculosis antimicrobial acquisition and coordinating facility (TAACF). Several compounds 4, 8, 12, 14, 19, 29 and 30, when tested at a concentration of 6.25 μg/ml against Mycobacterium tuberculosis H37Rv, showed an interesting activity with % inhibition in the range 38-96%. The most effective substituent in position 2, 4 or 7 of the 1,8-naphthyridine nucleus seem to be the piperidinyl group
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