1,720,979 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
Seismic body-wave anisotropy beneath continents
No full textA search for the effects of anisotropy on seismic body-waves predicted
by theory is described. Preliminary studies were based on long-period
data from the WWSSN, HGLP and SRO networks. These showed that data from
the WWSSN network are unsuitable for anisotropy studies because of
features in the geometry of the recording system which lead to misalignment
of the digitizer relative to the galvanometer-swing (which it is
not always possible to correct) and the fact that the horizontal components
are not always well matched. Digital data from the HGLP
(recorded after 1976) and SRO networks are more suitable for anisotropy
studies but eventually it was found that the anisotropic differences are
too small to be resolved by long-period instruments. Analysis of
short-period teleseismic shear-waves observed at LRSM stations located
in United States and southern Canada has revealed shear-wave splitting
diagnostic of anisotropy somewhere along the path. The shear-wave
splitting is often seen as two separate shear-wave arrivals on the rotated
horizontal components. All cases of shear-wave splitting are indicated
by an abrupt change in the direction of particle-motion in the
horizontal plane. A selection of seismograms and associated particlemotion
diagrams is presented in order to illustrate shear-wave splitting.
The polarizations of the first arrival shear-waves and the delays
between the shear-wave arrivals were measured and are presented in the
form of stereograms. The maximum shear-wave delay observed is 2.75
seconds and on the basis of this, we calculate the thickness of the anisotropic
layer to be 248 kms for a model with 4.5% differential shearwave
velocity anisotropy. For a model with much higher differential shear-wave velocity anisotropy (8.4%), the thickness of the layer is
only 136 kms. Our results do not allow us to constrain the depth to the
top of the anisotropic layer, although on the basis of other studies we
believe the anisotropic layer to be situated immediately below the
Mohorovicic discontinuity. The polarizations are broadly similar to
those obtained theoretically for the y- and z-cuts of olivine,
transversely isotropic olivine and mixture of transversely isotropic
olivine/isotropic material. On the basis of this, we tentatively identify
N50°E as a direction of symmetry and note that it is approximately
parallel to the absolute motion of the North-American plate. We therefore
suspect a causal relationship between plate motion and the generation
of anisotropy. The most likely hypothesis is that as the continental
lithosphere moves across the asthenosphere, the drag on the lithosphere
sets up a horizontal compression in the direction of motion of
the lithosphere relative to the asthenosphere and olivine crystals align
by {Okl} [100] pencil glide so that the a-axis points into the direction
of plate motion while the b and c axes form girdles perpendicular to the
a-axis. This would result in transverse isotropy with the axis of symmetry
horizontal, an orientation which is consistent with our results.
The existence of anisotropy in the upper mantle has implications for
other seismological studies. In particular, focal mechanism studies
which rely solely on S-wave polarizations will be erroneous and studies
of travel-time residuals will need to take account of the anisotropy
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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