1,721,215 research outputs found
Complex history of the Rembrandt basin and scarp system, Mercury
No full textDuring its second and third flybys, the
MESSENGER spacecraft imaged the wellpreserved
Rembrandt basin in Mercury’s southern
hemisphere. With a diameter of 715 km, Rembrandt
is the second largest impact structure recognized on
Mercury after the 1550-km-diameter Caloris basin.
Rembrandt is also one of the youngest major basins
and formed near the end of the Late Heavy
Bombardment (~3.8 Ga). Much of the basin interior
has been resurfaced by smooth, high-reflectance units
interpreted to be of volcanic origin. These units
host sets of contractional and extensional landforms
generally oriented in directions radial or concentric to
the basin, similar to those observed within the Caloris
basin; these structures are probably products of
multiple episodes of deformation.
Of particular note in the Rembrandt area is a
1,000-km-long reverse fault system that cuts the
basin at its western rim and bends eastward toward
the north, tapering into the impact material. On the
basis of its shape, the structure has previously been
characterized as a lobate scarp. Its formation and
localization have been attributed to the global
contraction of Mercury.
From MESSENGER flyby and orbital images, we
have identified previously unrecognized kinematic
indicators of strike-slip motion along the Rembrandt
scarp, together with evidence of interaction between
the scarp orientation and the concentric basin-related
structural pattern described above. Here we show
through cross-cutting relationships and scarp
morphology that the development of the Rembrandt
scarp was strongly influenced by tectonics related to
basin formation and evolution
Correction to “An extensive region of off‐ridge normal‐faulting earthquakes in the southern Indian Ocean” by Eric A. Bergman, John L. Nabelek, and Sean C. Solomon
No full text
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
Correction to “Microearthquakes Beneath the Median Valley of the Mid‐Atlantic Ridge Near 23°N: Tomography and Tectonics” by Douglas R. Toomey, Sean C. Solomon, and G. M. Purdy
No full textkoamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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