1,720,995 research outputs found
“Anthropometric evaluation of soft tissues improvement after distraction osteogenesis in hemifacial microsomia”.
No full textBending of the Bolivian orocline and growth of the central Andean plateau: Paleomagnetic and structural constraints from the Eastern Cordillera (22-24°S, NW Argentina)
No full textWe report new paleomagnetic and structural data
from late Cretaceous to Mio-Pliocene continental
sandy/silty sedimentary rocks from the Eastern
Cordillera (central Andes). Here, N–S to NNE–
SSW ridges hosting Paleozoic basement and upper
Cretaceous continental red beds overthrust thick
adjacent Cenozoic basins. Pretilting (and likely
primary) reliable directions gathered at 15 sites
document 45.9 ± 9.4, 30.1 ± 23.9, and 15.4 ±
19.3 clockwise (CW) rotations with respect to South
America occurring after the late Cretaceous (80 Ma),
Oligo-Miocene (20–30 Ma), and late Miocene-
Pliocene (5–10 Ma), respectively. Conversely, four
upper Cretaceous sites from the walls of a N–S leftlateral
strike-slip fault (Yavi–Abra Pampa fault) yield
a null rotation. About 20 km to the west, flower
structures and subvertical syntectonic strata dated at
14.26 ± 0.19 Ma are exposed along the subparallel
Abra Moreta left-lateral strike-slip fault. Relying on
data from the literature on the period when
deformation began, we suggest that since Eo-
Oligocene times (30–40 Ma) the Eastern Cordillera
has undergone a regional CW rotation of 40–50,
synchronous with crustal shortening and large-scale
bending of the Andean salient. The CW rotation is
possibly still active today, as documented by regional
GPS data from the Andes. Since 15 Ma ago, the
activity of N–S left-lateral strike-slip faults induced
counterclockwise rotations along the fault zone,
locally annulling the regional CW rotation. In
agreement with a previous model, we speculate that
mid-Miocene strike-slip activity accommodated the
progressive southward spreading of the Altiplano-
Puna high-altitude plateau, laterally migrating from the
overthickened crustal region of the salient apex
Paleomagnetic evidence for a pre-early Eocene (50Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications
No full textThe southernmost segment of the Andes of southern Patagonia and Tierra del Fuego forms a ∼700 km long
orogenic re-entrant with an interlimb angle of ∼90° known as Patagonian orocline. No reliable
paleomagnetic evidence has been gathered so far to assess whether this great orogenic bend is a primary
arc formed over an articulated paleomargin, or is due to bending of a previously less curved (or rectilinear)
chain. Here we report on an extensive paleomagnetic and anisotropy of magnetic susceptibility (AMS) study
carried out on 22 sites (298 oriented cores), predominantly sampled in Eocene marine clays from the
external Magallanes belt of Tierra del Fuego. Five sites (out of six giving reliable paleomagnetic results)
containing magnetite and subordinate iron sulphides yield a positive fold test at the 99% significance level,
and document no significant rotation since ∼50 Ma. Thus, the Patagonian orocline is either a primary bend,
or an orocline formed after Cretaceous–earliest Tertiary rotations. Our data imply that the opening of the
Drake Passage between South America and Antarctica (probably causing the onset of Antarctica glaciation
and global climate cooling), was definitely not related to the formation of the Patagonian orocline, but was
likely the sole consequence of the 32±2 Ma Scotia plate spreading. Well-defined magnetic lineations
gathered at 18 sites from the Magallanes belt are sub-parallel to (mostly E–W) local fold axes, while they
trend randomly at two sites from the Magallanes foreland. Our and previous AMS data consistently show
that the Fuegian Andes were characterized by a N–S compression and northward displacing fold–thrust
sheets during Eocene–early Miocene times (50–20 Ma), an unexpected kinematics considering coeval South
America–Antarctica relative motion. Both paleomagnetic and AMS data suggest no significant influence from
the E–W left-lateral Magallanes–Fagnano strike–slip fault system (MFFS), running a few kilometres south of
our sampling sites. We thus speculate that strike–slip fault offset in the Fuegian Andes may range in the
lower bound values (∼20 km) among those proposed so far. In any case our data exclude any influence of
strike–slip tectonics on the genesis of the great orogenic bend called Patagonian orocline
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
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
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