1,721,043 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
New time-independent formulation for creep damage in polycrystalline metals and its specialisation to high alloy steel for high-temperature applications
No full textIn this work, a new time-independent, micromechanism based, creep damage formulation, derived in the framework of the continuum damage mechanics (CDM) approach to creep proposed by Bonora et al., has been developed and specialized for high chromium steel grades. One of the major features of the proposed formulation is that the kinetic law of creep damage evolution depends only on the accumulated inelastic strain and stress triaxiality and not on time needed to reach a given creep deformation level. The effects associated with the microstructure evolution during high-temperature service, such as the nucleation, growth and coarsening of secondary phases, have been also taken into account through the definition of an evolution law for damage-model parameters. A procedure for the identification of the damage-model parameters using short-duration creep-test data (<10,000 h) has been developed. Long-term creep lives, up and beyond 50,000 h, in the temperature range 550-650 degrees C have been successfully predicted for ASTM steel grade 92 with high degree of accuracy
Substrate-directed asymmetric induction in the rhodium catalyzed hydroformylation of C-allyl-sugars: The influence of the glycoside-moiety on the selectivity of the reaction
No full textand C-allylgalactopyranosides 1c and 1d, -C-allylazaglucopyranoside 1e and -C-allylfruttofuranoside 1f were hydroformylated at low temperatures affording a mixture of linear and branched aldehydes in regioisomeric and diastereoisomeric ratios depending on the starting alkene. The results obtained have allowed us to study the influence of the different structural features of the sugar moiety on the regio- and diastereoselectivity of the hydroformylation reaction
Direct Synthesis of the Isosteric Phosphono Analogues of alpha-L-Rhamnose 1-Phosphate and beta-L-Fucose 1-Phosphate
No full textEasy and Stereoselective Synthesis of the Phosphono Analogue of a-L-Rhamnose 1-Phosphate
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