188,285 research outputs found
sj-pdf-1-sms-10.1177_20563051241232662 – Supplemental material for Perceiving Affective Polarization in the United States: How Social Media Shape Meta-Perceptions and Affective Polarization
No full textSupplemental material, sj-pdf-1-sms-10.1177_20563051241232662 for Perceiving Affective Polarization in the United States: How Social Media Shape Meta-Perceptions and Affective Polarization by Christian Staal Bruun Overgaard in Social Media + Society</p
sj-pdf-1-jou-10.1177_14648849211062738 – Supplemental Material for Mitigating the consequences of negative news: How constructive journalism enhances self-efficacy and news credibility
No full textSupplemental Material, sj-pdf-1-jou-10.1177_14648849211062738 for Mitigating the consequences of negative news: How constructive journalism enhances self-efficacy and news credibility by Christian SB Overgaard in Journalism</p
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
sj-pdf-1-nms-10.1177_14614448231176551 – Supplemental material for In different worlds: The contributions of polarization and platforms to partisan (mis)perceptions
No full textSupplemental material, sj-pdf-1-nms-10.1177_14614448231176551 for In different worlds: The contributions of polarization and platforms to partisan (mis)perceptions by Christian Staal Bruun Overgaard and Jessica R Collier in New Media & Society</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Organocatalytic Asymmetric Conjugate Addition to Allenic Esters and Ketones
No full textThe first example of an organocatalytic enantioselective conjugate addition of cyclic beta-ketoesters and glycine imine derivatives to electron-deficient allenes is described. We disclose that the corresponding chiral beta,gamma-unsaturated carbonyl compounds are formed exclusively under phase-transfer conditions using either cinchona-alkaloid-derived or biphenyl-based chiral quaternary ammonium salts as catalysts. The scope of the reaction for beta-ketoesters is outlined for allenes having a ketone or ester motif as electron-withdrawing group as well as different substituents in the 3-position, giving the optically active products in high yields and excellent diastereo- and enantioselectivities (90-96% ee). The conjugate addition also proceeds for a number of cyclic beta-ketoesters having different ring sizes, ring systems, and substituents in high yields and enantioselectivities. Glycine imine derivatives also undergo the asymmetric conjugate addition to electron-deficient allenes in high yields and with enantioselectivities in the range of 60-88% ee, thus providing a rapid entry to optically active a-vinyl-substituted a-amino acid derivatives. It is shown that the enantioselectivity is strongly dependent on the size of the ester moiety of the nucleophile in combination with the catalytic system used. The high synthetic value of the chiral products arising from these new catalytic processes is demonstrated by two straightforward transformations leading in one case to optically active hexahydrobenzopyranones and in the other to substituted pyroglutamates (gamma-lactames)
sj-docx-1-chi-10.1177_17423953211065005 - Supplemental material for The role of social support in the experience of life with ischemic heart disease for socially disadvantaged patients: A qualitative study
No full textSupplemental material, sj-docx-1-chi-10.1177_17423953211065005 for The role of social support in the experience of life with ischemic heart disease for socially disadvantaged patients: A qualitative study by Amanda Nikolajew Rasmussen, Andrew Guise and Charlotte Overgaard in Chronic Illness</p
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