1,721,178 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
NMR-STUDY OF THE CHEMICAL-EXCHANGE OF THE HYDRIDO LIGANDS IN THE BIS(BIS(DIPHENYLPHOSPHINO)ETHANE)TRIHYDRIDODIPLATINUM(II) CATION BY T1, T2, AND HD ISOTOPIC PERTURBATION
No full textProton longitudinal and transverse relaxation rates of hydrido resonances of different isotopomers in [H3Pt2(Dpe)2][BF4] [Dpe = bis(diphenylphosphino)ethane] show significant differences in the satellite peaks with respect to the central ones that can be used to evaluate the activation energy of the intramolecular exchange process and the chemical shift separation between bridging and terminal sites. An alternative route to get an estimation of the chemical shift values of the bridging and terminal hydrides in this derivative has been pursued by considering the isotopic shift of the three H-3, H2D, and HD2 isotopomers at different temperatures
UV Photoelectron Spectra of some Organometallic Carbonyl Osmium Clusters
No full textThe He(I) excited PE spectra of HOs3(μ3-L)(CO)9 (L-allenyl, allyl) and of HOs3(μ2-vinyl)(CO)10 are presented. Some gross spectral features are discussed on the basis of a direct comparison with previous results for Os3(CO)12 and the alkynyl corresponding cluster derivative. Large perturbations in the OsOs bonding levels are induced by the bridging hydride and the interaction with the organic substrate
Electronic-structure of Ferracyclopentadienyl Derivatives - Uv Pes and Abinitio Study of Fe2(mu-co)(co)5(c4r4) and Fe3(mu-co)2(co)6(c4r4)
No full text872Gas-Phase Ultraviolet Photoelectron Spectra of [Ni(η5-C5H5)]2(μ-C2R2) (R = H or CF3) Complexes
No full textThe u.v. photoelectron (p.e.) spectra of [{Ni(η-C5H5)}2(μ-C2H2)] and [{Ni(η-C5H5)}2{μ-C2(CF3)2}] are reported. For the first time p.e. spectral features which are related to ionizations from molecular orbitals involved in metal–alkyne back-donation have been detected. The analysis of p.e. results for the CF3 derivative allow us to discuss in detail the mechanism of interaction between an alkyne and two metallic centres
Substituent effects on Gd(III)-based MRI contrast agents: Optimizing the stability and selectivity of the complex and the number of coordinated water molecules
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