1,721,031 research outputs found
Note on the Name of Jersey in Jérriais
No full textCoates Richard. Note on the Name of Jersey in Jérriais. In: Romania, tome 107 n°426-427, 1986. pp. 380-382
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
Subsurface Imaging with Reverse Vertical Seismic Pro les
No full textA novel imaging process, referred to as vector image isochron (VII) migration, is specifically designed
to reduce artifacts caused by arrays with limited apertures. By examining the assumptions behind
generalized Radon transform (GRT) migration, a new approach is found which identities and suppresses
array artifacts, based on the array geometry and the migration earth model.
The new method works in four steps: 1) The conventional image is broken down according to the
orientation of imaged planes within the image space, forming a vector image of the earth; 2) the earth
model and the geometry of the arrays are used to derive vector image isochrons, which define the shape
of reflection events in the vector image space; 3) the vector image is transformed by summing along
the isochrons so that it depends on subsurface location and reflector orientation, rather than imaged
plane orientation. This process is referred to as vector image isochron (VII) transformation; and 4) the
transformed vector image is collapsed to a scalar image by summing over reflector orientations.
The VII imaging method is derived in both 2D and 3D with the assumption that at least one of the
arrays, source or receiver, is oriented horizontally. The surface array can have any distribution along the
surface. The other array can have any orientation, although in this paper it will be assumed to be either
another surface array or a vertically oriented downhole array. Downhole surveys in deviated wells, or in
multiple wells, can be imaged with VII migration, at the likely cost of more computation time.
The VII imaging method is tested on field data acquired in 1998 by MIT and several industry partners.
The dataset is a 3D reverse vertical seismic profile (RVSP) over a hydrocarbon-bearing pinnacle reef in
the northern Michigan reef trend. The survey exhibited two features of note: 1) A new, strong, downhole
vertical vibrator, and 2) a random distribution of surface receiver locations. Due to adverse conditions,
a large portion of the surface spread had to be abandoned. The reduced spatial coverage presents a
challenge to the new migration method, but also limits the extent of the migrated image, precluding an
evaluation of the reflectiveness of the random receiver spread.
The limited nature of the receiver array also causes artifacts in the image which resemble migration
"smiles". These are partially suppressed by limiting the dip aperture of the migration, but this also limits
the reflector dips that can be imaged. The new VII imaging scheme, on the other hand, removes the
artifacts without diminishing dipping reflectors. The VII images show more continuity along reflectors
than images made with the conventional method
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
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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