1,721,082 research outputs found
INNOVATIVE MATERIALS AND TECHNOLOGIES FOR THE CONSERVATION OF PAPER OF HISTORICAL, ARTISTIC AND ARCHAEOLOGICAL VALUE
No full textCrystallization of short aliphatic chains. Part II. An example of even fold surface with adjacent fold reentry and of a transition to chain extension.
No full textAn iodine-terminated paraffin, I(CH2)nI, was prepd. from degraded polyethylene [9002-88-4]; the paraffin had 156 .ang. peak mol. length and a sharp mol. wt. distribution. The paraffin was crystallized in lamellae of two thicknesses: (1) thickness close to half the chain length and (2) thickness intermediate between half chain length and fully extended chain. (1) Corresponds to each chain folding once with equal stems and with ends at the surface. In (2) the chain ends must turn into the lattice. In both cases the lamellar thickness was increased by annealing up to complete chain extension
A study on the location of radiation induced cross-links in polyethylene single crystals by selective degradation
No full textIrradiated cryst. polyethylene [9002-88-4] was selectively oxidatively degraded and the length distribution of the chain fragments analyzed by gel permeation chromatog. Since systems with crosslinks near the fold surface were distinguishable from random crosslink distributions, the obsd. preference of crosslinking in the fold region agreed with earlier soly. measurements
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
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