1,725,100 research outputs found
Jim McFarlane and Bev Haddad beside engine #5846, Revelstoke
No full textMcFarlane (left) Haddad (right), standing beside engine #5846 in Revelstoke
Star Formation in the NGC 5846 Group of Galaxies
Get PDFEnvironmental interactions in groups and clusters of galaxies are thought to alter the evolution of member galaxies. The goal of this research was to analyze gas and star formation properties of galaxies in the NGC 5846 group. A sample of group galaxies was observed at CTIO (Cerro Tololo Inter-American Observatory in Chile) and KPNO (Kitt Peak National Observatory) using broadband red (R) and narrowband hydrogen emission line (Hα) filters. The images were reduced and analyzed to extract star formation rates and distributions. Neutral hydrogen data from the Arecibo Legacy Fast ALFA (ALFALFA) survey were used to measure the cold neutral gas content, which provides the raw material for star formation. The amounts and extents of star formation in the sample galaxies are compared as a function of cold gas content, galaxy type, and position in the group and compared to those of galaxies located in other environments. Of the NGC 5846 galaxies sampled using the wide-field MOSAIC camera at KPNO, 32% had Hα emission detected. The star-forming galaxies in the NGC 5846 group show a range of star formation rates, with a number that have lower mean star formation rates and gas content compared to isolated galaxies, but also a few that show enhanced star formation. Truncated star formation similar to that of galaxies in the Virgo Cluster is seen in several NGC 5846 galaxies. These results indicate the possibility of environmental interactions in this intermediate density group environment
Linked collectors and determiners for: Validity of Lepadichthys misakius (Tanaka 1908) and redescription of Lepadichthys frenatus Waite 1904 (Gobiesocidae: Diademichthyinae).
No full textNatural history specimen data linked to collectors and determiners held within, "Validity of Lepadichthys misakius (Tanaka 1908) and redescription of Lepadichthys frenatus Waite 1904 (Gobiesocidae: Diademichthyinae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/047432aa-5846-4990-94df-8c46e0cc15f4">https://bionomia.net/dataset/047432aa-5846-4990-94df-8c46e0cc15f4</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/047432aa-5846-4990-94df-8c46e0cc15f4">https://gbif.org/dataset/047432aa-5846-4990-94df-8c46e0cc15f4</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Validity of Lepadichthys misakius (Tanaka 1908) and redescription of Lepadichthys frenatus Waite 1904 (Gobiesocidae: Diademichthyinae).
No full textNatural history specimen data linked to collectors and determiners held within, "Validity of Lepadichthys misakius (Tanaka 1908) and redescription of Lepadichthys frenatus Waite 1904 (Gobiesocidae: Diademichthyinae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/047432aa-5846-4990-94df-8c46e0cc15f4">https://bionomia.net/dataset/047432aa-5846-4990-94df-8c46e0cc15f4</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/047432aa-5846-4990-94df-8c46e0cc15f4">https://gbif.org/dataset/047432aa-5846-4990-94df-8c46e0cc15f4</a>. Formatted as a Frictionless Data package
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Extragalactic globular clusters in the near infrared III. NGC 5846 and NGC 7192
Get PDFIn this third paper of our series on near-IR and optical photometry of
globular cluster systems in early-type galaxies we concentrate on the
photometric results for NGC 5846 and NGC 7192, two group ellipticals,
and on a first comparison between the globular cluster systems
investigated so far. In NGC 5846 the colour-colour diagram shows clear
bi-modality in , which is confirmed by a KMM test. The mean
colour of both peaks were estimated to be and . The
situation in NGC 7192 is different, in that the colour-colour diagram
gives no evidence for a distinct second population of globular
clusters. Using simulated colour distributions of globular cluster
systems, we make a first step in quantifying the cumulative age
distribution in globular cluster systems. Also here the result for
NGC 5846 leads us to the conclusion that its metal-rich globular
cluster population contains two globular cluster populations which
differ in age by several Gyr. The age structure for NGC 7192 shows
instead strong similarity with a single-age
population
Variations on the Author
Get PDF“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
Get PDFWe 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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