1,723,664 research outputs found
A Search for H2O Maser Emission in Southern Active Galactic Nuclei and Star-Forming Galaxies: Discovery of a Maser in the Edge-On Galaxy IRAS F01063-8034
No full textWe report the cumulative results of five surveys for H 2O maser emission at 1.35 cm wavelength in 131 active galactic nuclei (AGNs) and star-forming galaxies, conducted at the Parkes Observatory between 1993 and 1998. We detected one new maser, in the edge-on galaxy IRAS F01063-8034, which exhibits a single ∼0.1 Jy spectral feature at 4282 ± 6 km s -1 (heliocentric) with an unusually large 54 ± 16 km s -1 half-power full width. The centroid velocity of the emission increased to 4319.6 ± 0.6 km s -1 (38 ± 2 km s -1 width) over the 13 days between discovery and confirmation of the detection. A similarly broad-line width and large change in velocity has been noted for the maser in NGC 1052, wherein jet activity excites the emission. Neither optical spectroscopy, radio-infrared correlations, nor infrared colors provide compelling evidence of unusual activity in the nucleus of IRAS F01063-8034. Since the galaxy appears to be outwardly normal at optical and infrared wavelengths, detection of an H 2O maser therein is unique. The maser emission is evidence that the galaxy harbors an AGN that is probably obscured by the edge-on galactic disk. The detection highlights the possibility that undetected AGNs could be hidden in other relatively nearby galaxies. No other maser emission features have been identified at velocities between 3084 and 6181 km s -1
Linked collectors and determiners for: Database on reference specimens for medicinal plants of the Fabaceae family, conserved at the CNARP herbarium.
No full textNatural history specimen data linked to collectors and determiners held within, "Database on reference specimens for medicinal plants of the Fabaceae family, conserved at the CNARP herbarium". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/72414bd9-69dc-461c-8034-b7d895eccf63">https://bionomia.net/dataset/72414bd9-69dc-461c-8034-b7d895eccf63</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/72414bd9-69dc-461c-8034-b7d895eccf63">https://gbif.org/dataset/72414bd9-69dc-461c-8034-b7d895eccf63</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Database on reference specimens for medicinal plants of the Fabaceae family, conserved at the CNARP herbarium.
No full textNatural history specimen data linked to collectors and determiners held within, "Database on reference specimens for medicinal plants of the Fabaceae family, conserved at the CNARP herbarium". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/72414bd9-69dc-461c-8034-b7d895eccf63">https://bionomia.net/dataset/72414bd9-69dc-461c-8034-b7d895eccf63</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/72414bd9-69dc-461c-8034-b7d895eccf63">https://gbif.org/dataset/72414bd9-69dc-461c-8034-b7d895eccf63</a>. Formatted as a Frictionless Data package
Implementação do sistema pascal concorrente no computador labo-8034
Get PDFO trabalho descreve a implementação do Sistema Pascal Concorrente de Brinch Hansen no minicomputador LABO-B034 (Nixdorf B870/1). O sistema e composto por Bois compiladores - um para Pascal Concorrente a outro Para Pascal Seqüencial - o um sistema operacional básico, mono-usuário, clue Paden' ser usados Para desenvolvimento de outros sistemas operacionais, em linguagem de alto nível. 0 trabalho de implementação inclui o estudo do sistema de Brinch Hansen, a criação de dois programas em Assembler do LABO-8034 - um "kernel", clue executa as funções básicas do sistema, e um interpretador para o código virtual morado pelos compitadores - e a definição a inicialização de um disco com o sistema.The implementation of the Brinch Hansen's Concurrent Pascal System on the LABO-8034 computer (Nixdorf 8870/1) is described. The system comprises two compilers - the Concurrent Pascal compiler and the Sequential Pascal compiler - and a basic operating system, single user oriented, suitable for the development of operating systems using a high level language (Pascal). The work includes the understanding of the Brinch Hansen's system, the development of two assembly programs - a kernel that executes the basic functions of operating systems and an interpreter for the virtual code generated by the Pascal compilers - and also the definition and generatic of the system
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
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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