1,721,005 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
Crossed beam studies of the reactions of atomic oxygen in the ground 3P and first electronically excited 1D states with hydrogen sulfide
No full textThe reactions of both ground, 3P, and electronically excited, 1D, oxygen atoms with H 2S were studied using crossed molecular beam method. The reactions which lead to HSO+H for the O( 3P), and to HSO/HSO+H and SO_H 2 for the O( 1D) reactions were also studied. The dynamics of the channels which lead to HSO/HSO+H were elucidated for the reactions of both states. The enthalpy of formation of the HSO radical was analyzed and their conformity with the experimental data was evaluated
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
CROSSED BEAM STUDIES OF THE REACTION DYNAMICS OF O(1D) ATOMS WITH SPECIES OF ATMOSPHERIC INTEREST - O(1D) + HCL AND HBR
No full textThe elementary reactions of electronically excited oxygen atoms O(1D) with some simple molecules of atmospheric interest are studied by the crossed molecular beam scattering method with mass spectrometric detection. A supersonic O( D)atom beam with a wide variable range of translational energies is generated by a high pressure radiofrequency (RF) discharge nozzle beam source using dilute O2 in He or Ne gas mixtures and high RF power. From angular and velocity distribution measurements detailed information on the dynamics of the O(1D) + HX → XO + H (X=Cl, Br) reactions has been obtained. The relation between reaction dynamics and potential energy surface is examined. Comparison with previous spectroscopic investigations of the competing channel leading to OH + X and with bulk results is made. Preliminaryresults obtained for the O(1D) + HS reaction are also reported
Atmospheric chemistry: molecular beam studies of elementary chemical reactions involving electronically excited 1D oxigen atoms.
No full textThe elementary reactions of atomic oxygen in the first electronically excited 1D state with simple molecules, of relevance to atmosphere and, specifically, ozone chemistry are studied by the crossed molecular beam scattering method with mass spectrometric detection. From measurements of product angular and velocity distributions detailed information on the dynamics of the reactions of O(1D) with HCl, HBr, and H2S is obtained. The relation between dynamics and potential energy surfaces for reaction is examined. The hydrogen displacement channel leading to XO formation (X=Cl, Br, HS) is established to play an important role in the reactions of O(1D) with hydrides
- …
