1,726,009 research outputs found
Planetary companions orbiting the M dwarfs GJ 724 and GJ 3988
No full textWe report the discovery of two exoplanets around the M dwarfs GJ 724 and GJ 3988 using the radial velocity (RV) method. We obtained a total of 153 3.5 m Calar Alto/CARMENES spectra for both targets and measured their RVs and activity indicators. We also added archival ESO/HARPS data for GJ 724 and infrared RV measurements from Subaru/IRD for GJ 3988. We searched for periodic and stable signals to subsequently construct Keplerian models, considering different numbers of planets, and we selected the best models based on their Bayesian evidence. Gaussian process (GP) regression was included in some models to account for activity signals. For both systems, the best model corresponds to one single planet. The minimum masses are 10.75−0.87+0.96 and 3.69−0.41+0.42 Earth-masses for GJ 724 b and GJ 3988 b, respectively. Both planets have short periods (P < 10 d) and, therefore, they orbit their star closely (a < 0.05 au). GJ 724 b has an eccentric orbit (e = 0.577−0.052+0.055), whereas the orbit of GJ 3988 b is circular. The high eccentricity of GJ 724 b makes it the most eccentric single exoplanet (to this date) around an M dwarf. Thus, we suggest a further analysis to understand its configuration in the context of planetary formation and architecture. In contrast, GJ 3988 b is an example of a common type of planet around mid-M dwarfs
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
Rural education imaginaries in digital education policy:An analysis of CONPES 3988 in Colombia
Full text linkThis paper explores the digital imaginaries presented in the educational governance and policy landscape of Colombia through the lens of rurality. It interrogates one policy instrument, namely CONPES 3988, which establishes the importance of digital technologies in national-level educational policies and subsequent strategies. CONPES 3988 draws a strong focus on educational ‘innovation’, which is explicitly conceptualised through digital technology, understood as the transformation of traditional educational practices through educational technologies to improve educational quality. CONPES 3988 establishes the actions needed to realise a process of educational innovation through educational technologies and has four pillars: to increase access to digital technologies for the creation of innovative learning spaces, to improve Internet connectivity of official educational institutions, to promote the appropriation of digital technologies in the educational community, and to strengthen the monitoring and evaluation of the use, access and impact of digital technologies in education. CONPES 3988 draws a strong focus on educational ‘innovation’, which is explicitly conceptualised through digital technology, understood as the transformation of traditional educational practices through educational technologies to improve educational quality.CONPES 3988 captures and surfaces digital imaginaries that speak to rural education, particularly in how it is framed and performed and how digital technology use is explicitly tied to market discourses of quality, sustainability, transformation, and breaks from tradition.Rural education in Colombia, and indeed rurality itself and its attendant plurality, are potentially disadvantaged in this framing as they become transactional actors in a larger educational system framed increasingly in digital technologies emerging from the urban centres of the Colombian government. Such an analysis provides insights that extend well beyond Colombia, particularly in noting how rurality and rural education are reframed when there is policy and governance emphasis on digital technology use in education.
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
3988. Chronique de la traison et mort de Richart II, roy d'Engleterre
No full text3988. Chronique de la traison et mort de Richart II, roy d'Engleterre. In: Molinier Auguste. Les Sources de l'histoire de France - Des origines aux guerres d'Italie (1494). IV. Les Valois, 1328-1461. Paris : A. Picard et fils, 1904. p. 209
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
3988. Chronique de la traison et mort de Richart II, roy d'Engleterre
No full text3988. Chronique de la traison et mort de Richart II, roy d'Engleterre. In: Molinier Auguste. Les Sources de l'histoire de France - Des origines aux guerres d'Italie (1494). IV. Les Valois, 1328-1461. Paris : A. Picard et fils, 1904. p. 209
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