1,722,235 research outputs found
Petersen, S J, QX3365
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/410520Surname: PETERSEN. Given Name(s) or Initials: S J. Military Service Number or Last Known Location: QX3365. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 1624.226236
Item: [2016.0049.42789] "Petersen, S J, QX3365
Factorizations of 4-Regular Graphs and Petersen′s Theorem
No full textAbstractOn the basis of the observation that a 3-regular graph has a perfect matching if and only if its line graph has a triangle-free 2-factorisation, we show that a connected 4-regular graph has a triangle-free 2-factorisation, provided it has no more than two cut-vertices belonging to a triangle. This result is equivalent to Petersen′s theorem about the existence of perfect matchings in 3-regular graphs
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
Stereoselective synthesis of novel 19-nor-steroids by a double Heck reaction
No full textThe estrane 4 was synthesized by two successive Heck reactions starting from enantiopure 2 and the cyclohexenone 5, which contains a (Z)-bromovinyl group. The first intermolecular Pd-catalyzed reaction leads to 10 in a highly regio-and diastereoselective manner. Transformation of the enone 10 to give the corresponding enol triflate 14 followed by an intramolecular Heck reaction affords the cyclized product 4 with an unusual cis-junction of the rings B and C in high yield
Stereoselective total synthesis of a novel D-homosteroid by a twofold Heck reaction
No full textThe D-homosteroid 1 was synthesized by two successive Heck reactions starting from enantiopure 3 and the bromoarene 2 containing a (Z)-bromovinyl group. The first intermolecular Pd-catalyzed reaction leads to 6 in a highly regio- and diastereoselective way which forms 1 with an unusual cis-junction of the rings B and C by a second intramolecular Heck reaction
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