1,721,128 research outputs found
sj-docx-1-dhj-10.1177_20552076231222422 - Supplemental material for The portrayal of organ donation on TikTok: A content analysis of popular English-language TikTok videos
No full textSupplemental material, sj-docx-1-dhj-10.1177_20552076231222422 for The portrayal of organ donation on TikTok: A content analysis of popular English-language TikTok videos by Alessandro R Marcon, Marco Zenone and Timothy Caulfield in DIGITAL HEALTH</p
sj-docx-2-dhj-10.1177_20552076231222422 - Supplemental material for The portrayal of organ donation on TikTok: A content analysis of popular English-language TikTok videos
No full textSupplemental material, sj-docx-2-dhj-10.1177_20552076231222422 for The portrayal of organ donation on TikTok: A content analysis of popular English-language TikTok videos by Alessandro R Marcon, Marco Zenone and Timothy Caulfield in DIGITAL HEALTH</p
Substrate contribution to the surface impedance of HTS films on Si
No full textWe study the effects of semiconductor substrates on the surface impedance of high-Tc Super-
conductor (HTS) YBa2Cu3O7−δ (YBCO) films. The characteristic impedance of silicon (Si)
(for different doping levels and for different charge carrier scattering times) is evaluated. In
particular, the most relevant features of Si electrodynamics are highlighted by the introduc-
tion of suitable normalized quantities. The effective surface impedance of the YBCO films
on Si substrates is then calculated and discussed for different temperatures and frequencies
in the microwave range, comparing the obtained results to their limiting expressions for bulk
and thin-film HTS. Our analysis shows how the widely used thin-film approximation for the
surface impedance can fail, critically highlighting the conditions it requires to be correctly
used. We show that substrate contributions can heavily influence the overall response
Dielectric resonators for the measurement of superconductor thin films surface impedance in magnetic fields at high microwave frequencies
No full textWe present the design and realization of cylindrical dielectric resonators operating in the 40–
60 GHz frequency range, designed for the measurement of the surface resistance and of the
surface reactance shift in High-T c Superconductors (HTS) thin films in a dc magnetic field.
The resonators are single tone, based on the TE011 mode, and multiple tone, the latter al-
lowing in principle to exploit the simultaneous determination of the surface impedance at
different frequencies. As an application example, we report the temperature and field depen-
dencies of the effective surface impedance of some cuprate superconductors thin films. The
results are compared with those obtained through the use of a standard metal cavity with a
similar Q-factor and operating in the same frequency range. The comparison highlights a su-
perior stability and a higher sensitivity, resulting in an increase of about two orders of magni-
tude in the resolution of the surface impedance measurement. By contrast, the dissipative part
of the superconducting transition (above T/T c = 0.97) is better studied with the metal cavity.
We also present measurements in the vortex state in YBa2Cu3O7−δ and Tl2Ba2 CaCu2O8+x
that show significantly different physics
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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