1,721,184 research outputs found
Triad1 and its role during myelopoiesis.
No full textContains fulltext :
29992.pdf (Publisher’s version ) (Open Access)
Contains fulltext :
52471.pdf (Publisher’s version ) (Open Access)RU Radboud Universiteit Nijmegen, 23 maart 2007Promotor : Witte, T.J.M. de Co-promotores : Reijden, B.A. van der, Jansen, J.H.167 p
High-contrast imaging of HD 29992 and HD 196385 with GPI
No full textBased on high contrast images obtained with the Gemini Planet Imager (GPI),
we report the discovery of two point-like sources at angular separations of
and from the stars HD 29992 and HD 196385. A
combined analysis of the new GPI observations and images from the literature
indicates that the source close to HD 29992 could be a companion to the star.
Concerning HD 196385, the small number of contaminants () suggests
that the detected source may be gravitationally bound to the star. For both
systems, we discarded the presence of other potential companions with
M at . From stellar model atmospheres and
low-resolution GPI spectra, we derive masses of - M
for these sources. Using a Markov-chain Monte Carlo approach, we performed a
joint fit of the new astrometry measurements and published radial velocity data
to characterize the possible orbits. For HD 196385B, the median dynamic mass is
in agreement with that derived from model atmospheres, whilst for HD 29992B,
the orbital fit favors masses close to the brown dwarf regime(
M). HD 29992 and HD 196385 might be two new binary systems with
M-type stellar companions. However, new high angular resolution images would
help to definitively confirm whether the detected sources are gravitationally
bound to their respective stars, and permit tighter constraints on the orbital
parameters of both systems
Handout from the digital information meeting: Provenance research and funding opportunities in Germany on February, 14 & 16, 2024
No full textDies ist eine korrigierte Version von dieser Publikation:
https://doi.org/10.18452/29992 (Grund der Korrektur: Formale
Korrekturen)The paper provides an overview of resources for researching materials from colonial contexts in libraries, archives and museums and university collections. It is based on the authors’ presentations at the digital information meeting "Provenance research and funding opportunities in Germany“ which was organized by the Network Colonial Contexts on 14 and 16 February 2024.Das Arbeitspapier gibt einen Überblick über Ressourcen zur Forschung zu Materialien aus kolonialen Kontexten in Bibliotheken, Archiven und Museen sowie Universitätssammlungen. Es basiert auf den Vorträgen der Autor:innen auf der digitalen Informationsveranstaltung "Provenienzforschung und Fördermöglichkeiten in Deutschland", die vom Netzwerk Koloniale Kontexte am 14. und 16. Februar 2024 veranstaltet wurde
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
High-contrast imaging of HD 29992 and HD 196385 with the Gemini Planet Imager
No full textBased on high contrast images obtained with the Gemini Planet Imager (GPI), we report the discovery of two point-like sources at angular separations of ∼ 0.1800 and ∼ 0.8000 from the stars HD 29992 and HD 196385. A combined analysis of the new GPI observations and images from the literature indicates that the source close to HD 29992 could be a companion to the star. Concerning HD 196385, the small number of contaminants (∼ 0.5) suggests that the detected source may be gravitationally bound to the star. For both systems, we discarded the presence of other potential companions with > 75 MJup at ∼ 0.3−1.3 00. From stellar model atmospheres and low-resolution GPI spectra, we derive masses of ∼ 0.2 - 0.3 M for these sources. Using a Markov-chain Monte Carlo approach, we performed a joint fit of the new astrometry measurements and published radial velocity data to characterize the possible orbits. For HD 196385B, the median dynamic mass is in agreement with that derived from model atmospheres, whilst for HD 29992B, the orbital fit favors masses close to the brown dwarf regime(∼ 0.08 M). HD 29992 and HD 196385 might be two new binary systems with M-type stellar companions. However, new high angular resolution images would help to definitively confirm whether the detected sources are gravitationally bound to their respective stars, and permittighter constraints on the orbital parameters of both systems.Fil: García, Luciano Héctor. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Petrucci, Romina Paola. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Jofre, Jorge Emiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; ArgentinaFil: Gomez, Mercedes Nieves. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentin
Variations on the Author
No full text“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
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
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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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