1,721,203 research outputs found
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
Analysing aeromagnetic, airborne gravity and radar data to unveil variable basal boundary conditions for the East Antarctic Ice Sheet in the Wilkes Subglacial Basin
No full textThe Wilkes Subglacial Basin (WSB) extends for ca 1,400 km from George V Land into the interior of East Antarc-
tica and hosts several major glaciers that drain a large sector of the East Antarctic Ice Sheet (EAIS). The region
is of major significance for assessing the long-term stability of the EAIS, as it lies well below sea level and its
bedrock deepens inland. This makes it potentially more prone to marine ice sheet instability, much like areas of the
West Antarctic Ice Sheet (WAIS) that are presently experiencing significant mass loss. This sector of the EAIS has
also become a focus of current research within IODP Leg 318 that aims to better comprehend the initial stages of
glaciation and the history and stability of the EAIS since the Eocene-Oligocene boundary. Understanding geologi-
cal boundary conditions onshore is important to assess their influence on ice sheet dynamics and long-term stability
and interpret the paleo-ice sheet record. Early geophysical models inferred the existence of a major extensional
sedimentary basin beneath the WSB. This could in principle be similar to some areas of the WAIS, where subglacial
sediments deposited within rift basins or forming thin marine sedimentary drapes have been inferred to exert a key
influence on both the onset and maintenance of fast-glacial flow. However, later geophysical models indicated that
the WSB contains little or no sediment, is not rift-related, and formed in response to Cenozoic flexural uplift of the
Transantarctic Mountains (TAM). A major joint Italian-UK aerogeophysical exploration campaign over parts of
the WSB is super-seeding all these earlier geophysical views of the basin (Ferraccioli et al., 2009, Tectonophysics).
Precambrian and Paleozoic basement faults can now be recognised as exerting fundamental controls on the loca-
tion of both the topographic margins of the basin and it sub-basins; ii) the crust underlying the basin is thinner
compared to the TAM (Jordan et al., 2013, Tectonophysics), but is unlikely to be strongly affected by Cretaceous
or Cenozoic-age rifting, in contrast to the WAIS, which is largely underlain by the West Antarctic Rift System;
iii) its bedrock is composed of rocks of different ages and composition, including Proterozoic basement, Neopro-
terozoic and Cambrian sediments intruded by Cambrian arc rocks, and cover rocks formed primarily by Beacon
sediments intruded by Jurassic Ferrar sills (e.g. Cook et al., 2013 Nature Geoscience). Within the framework of
the collaborative Italian-US-UK BABOC project a new international initiative has been launched to analyse and
model variable geological boundary conditions in the WSB using geophysical data. A large amount of new ICE-
CAP aerogeophysical observations have been acquired over four campaigns over the region since the International
Polar Year, in particular over the southern part of the basin, and some profiles over the northern coastal margin of
the basin. We will present an initial interpretation of the potential field signatures and radar data over the northern
and central parts of the basin to help establish tectonic and lithological controls on the subglacial topography and
different EAIS flow regimes within the WSB
An assessment of deep hot-water drilling as a means to undertake direct measurement and sampling of Antarctic subglacial lakes: experience and lessons learned from the Lake Ellsworth field season 2012/13
Full text linkIn the early hours of 25 December 2012, an attempt to explore Subglacial Lake Ellsworth, West Antarctica, using a specially designed hot-water drill, was halted. This UK project, involving several universities, the British Antarctic Survey and the National Oceanography Centre, had been in planning for 10 years. The project developed a full blueprint for subglacial lakes research, involving access to the subglacial environment through deep drilling, direct measurement and sampling of water and sediment by the construction of a probe and sediment corer, and environmental protocols to ensurecleanliness in line with international agreements on stewardship and protection of subglacial systems. Drilling was ceased after the main borehole failed to link with a subsurface cavity of water, built up over ~40 hours. Without this link, insufficient water was available to continue drilling downwards to the lake, ~3000m beneath the surface. On return to the UK, an external review of the programme was undertaken to formally assess the reasons for the fieldwork failure, and to make recommendations on the modifications necessary for success. From this review, the Lake Ellsworth programme formulated a pathway along which a second attempt to explore the lake can be developed. Here details of the Lake Ellsworth field experiment, the circumstances that led to its failure and the corrections required are presented. Hot-water drilling is still regarded as the only feasible scheme for assuring clean access to the subglacial environment. The lessons learned from the Lake Ellsworth experience are substantial, however, and demonstrate that considerable technological and methodological advances are necessary for successful future research on subglacial lakes beneath thick (>2 km) ice
koamabayili/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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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