1,721,035 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
Prenatal diagnosis of bladder exstrophy by 2D and 3D ultrasound
No full textWe are presenting a case in which prenatal diagnosis of bladder exstrophy was successfully performed at 23 weeks by the use of two-dimensional (2D) and three-dimensional (3D) ultrasound. The mother was 30 years old, primigravida. During a routine ultrasound scan the bladder was not visualized, the umbilical cord insertion was displaced downwards by an echogenic abdominal wall mass and 3D ultrasound confirmed an abdominal bulge below the umbilical cord insertion by the use of surface rendering mode. No other obvious fetal defect was observed. The anomaly was managed expectantly and genetic amniocentesis was not recommended. A viable female fetus was delivered at 39 weeks by elective Cesarean section with a birth-weight of 2555 g and Apgar score of 10/10. Postnatal clinical assessment confirmed the diagnosis and surgical intervention was performed 24 hours after birth for the reconstruction of the defect with a good neonatal outcome. The infant is one year old at present and in good condition. Prenatal diagnosis of bladder exstrophy is difficult and it has been extensively documented in 12 previously published cases. To our knowledge, this is the second report of prenatal diagnosis of bladder exstrophy supported by 3D ultrasound. Surface-rendering mode is a computerized algorithm which facilitates the imaging of surfaces within a region of interest in a three-dimensional fashion, rather than in cross-sectional planes. Surface rendering mode appears to be a helpful tool in the diagnosis of bladder exstrophy permitting the visualization of abdominal wall bulge, cord insertion and genitalia, playing a substantial role in the study of the anatomy. In this case 3D ultrasound was helpful in confirming the diagnosis of bladder exstrophy and simplified explanation and discussion with the parents
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
Direct measurement of nutrient concentrations in freshwaters with a miniaturized analytical probe: evaluation and validation
Full text linkTorcular herophili venous malformation diagnosed by ultrasound and followed up by fetal MRI
No full textA dramatically expansive vascular mass occupying about half of
the skull volume was detected by the use of ultrasound in the
posterior cerebral fossa of a 22-week fetus. We performed a fetal
MRI confirming the presence of a massive extraparenchymal lesion
in the region of confluence of the venous sinuses. It was isointense
to the cortex in T1 and T2 with ipointense components in T2
and iperintense in T1. No signal alteration was detected within
cerebellar and cerebral hemispheres. The silvian region presented
two dilated venous vessels. The final diagnosis was dural sinuses
malformation of the torcular Herophili. Serial MRI scans were
performed: at 26 weeks we noted an increase in size, afterwards the
mass shrank progressively at 31 and 37 weeks. The macrocephalic
fetus was delivered at 38 weeks by elective Cesarean section and
neither neurological sequelae nor cardiac failure were present at
birth. At the first MRI scan 24 hours after birth the lesion was
unchanged and the signal was consistent with partial thrombosis.
The transverse sinuses and the posterior portion of the superior
sagittal sinus, in the peripheral region of the venous lake, could
not be demonstrated by venous angiographic MRI, as well as the
left jugular vein. No suggestive signs for a clear arterial-venous
shunt were identified by the use of arterial angiographic MRI. The
lesion reduced in size progressively in the following two months
and a better depiction of transverse sinuses and jugular veins was
obtained. The arterial angiographic MRI study at two months of
age detected arterial-venous shunts arising from the mean meningeal
artery and right carotid artery meeting the region of the torcular
Herophili. At 6 months of age the shunts were less evident and the
mass was further decreased. The infant is currently two years of age
and in good condition. No treatment was performed at present due
to the further decrease in size of the lesion and to the absence of
neurological signs and symptoms
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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