1,720,963 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
Magnitude and Timing of Extreme Continental Extension, Central Death Valley Region, California
Full text linkNew geochronologic, stratigraphic, and sedimentologic
data indicate extreme late Cenozoic extension across the
central Death Valley region (fig. 9). ^(40)Ar/^(39)Ar geochronology
of sanidine from tuffs intercalated with steeply tilted
sediments along the eastern margin of the central Death Valley
region, including sections near Chicago Pass and at
Eagle Mountain, indicates deposition from approximately
15 to 11.7 Ma (fig. 10). Clasts of marble, orthoquartzite,
fusilinid limestone, and leucogabbro are prominent at both
locations. The only known source in the Death Valley
region for this clast assemblage is in the southern
Cotton wood Mountains, more than 100 km away on the
western flank of the Death Valley region. U/Pb geochronology
of baddeleyite confirms that leucogabbro clasts from
both sections have the same igneous crystallization age
(~180 Ma) as the leucogabbroic phase of the Hunter Mountain
batholith, in the southern Cottonwood Mountains. The
sediments include debris flows, flood deposits, and monolithic
boulder beds of large leucogabbro clasts (>1 m), suggesting
deposition in an alluvial fan setting. Sedimentary
transport of these deposits is unlikely to have exceeded 20
km. Restoration of the Eagle Mountain and Chicago Valley deposits to a position just east of the southern Cotton wood
Mountains results in approximate net translations of 80 km
and 104 km, respectively, at an azimuth of N. 67° W. (fig.
11). This suggests overall extension magnitudes of at least
500 percent across the Death Valley region since 12 Ma,
with strain rates that approached 10^(-14)/s during maximum
extension. These results support previous reconstructions
based on isopachs and Mesozoic structural features. (See,
for example, Wernicke and others, 1988.
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
Tectonic Evolution of the Death Valley Region
Full text linkProgress in understanding the evolution of continents
hinges on seamlessly applying techniques of modern
structural geology to the largest possible regions of the crust.
In most areas, meaningful practice of regional structural
geology is limited by a lack of correspondence between
highly strained crust and well-defined regional strain
markers, that is, large-scale geologic features whose initial
geometry can be reasonably inferred, and their kinematic
evolution constrained, through structural, stratigraphic,
isotopic, paleomagnetic, and geodetic study.
A ~100,000-km^2 segment of the U.S. Cordilleran orogen,
encompassing the celebrated landscapes of Death Valley
National Park and five nearby parks that are among the
most visited in the U.S., was severely deformed in late Cenozoic
time. In addition to spectacular geologic exposures,
the region harbors a rare endowment of regional structural
markers, developed before and during late Cenozoic deformation.
The markers are defined by isopachs and facies
boundaries in the west-thickening Neoproterozoic-Paleozoic
Cordilleran miogeocline, by pre-Cenozoic thrust faults
that disrupt the miogeoclinal wedge, and by proximal Tertiary
terrigenous detrital strata and their source regions. The
region is still tectonically active, providing an opportunity to
compare deformation patterns of the last decade, constrained
by geodetic studies, with late Cenozoic deformation patterns
spanning 15-20 m.y.
These scientific assets have attracted the attention of
significant numbers of structural geologists over the last
three decades, and distinguished the region as the birthplace
of, and testing ground for, an impressive number of fundamental
tectonic ideas. Oroclinal bending of mountain
ranges, continental transform faulting and "pull-apart"
basins, low-angle normal faulting, the influence of plate
motions on intracontinental deformation, the "rolling hinge"
model of progressive extensional deformation, the fluid
crustal layer or "crustal asthenosphere" concept, and Pratt
isostatic compensation of mountain ranges were all originally
discovered or have their best known expressions in the
region. This remarkable history of geologic investigation
and innovation continues unabated as growing numbers of
scientists recognize it as a unique place on Earth to ponder
the nature and origin of large-scale continental deformation
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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