1,720,976 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
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
TRE CASI DI MIOCARDITE ACUTA DA PARVOVIRUS B19
No full textL’infezione da Parvovirus B19, responsabile del “megaloeritema infettivo”, può determinare conseguenze cliniche gravi, tra le quali: la miocardite acuta, la crisi aplastica del midollo osseo e l’artrite. Esponiamo tre casi clinici di miocardite acuta
secondaria a infezione da Parvovirus B19 che hanno avuto decorso sfavorevole: S, femmina di 18 mesi, M, femmina di 3 anni, A, maschio di 2 anni. Le bambine riferivano anamnesi negativa, invece A era affetto da metilmalonico aciduria. S
giungeva in PS dopo tre giorni di febbre: soporosa, pallida, dispnoica e tachicardica con soffio sistolico, crepitii alle basi polmonari ed epatomegalia. M riferiva astenia e iporessia da un mese e, all’ingresso in PS, era pallida, irritabile, tachicardica
con soffio sistolico ed epatomegalia. A giungeva in PS per febbre e astenia e, all’RX torace, presentava focolai pneumonici retrocardiaci. Tutti presentavano leucocitosi con indici di flogosi positivi. Le bambine mostravano all’ecocardiogramma
severa insufficienza sistolica biventricolare: S con un quadro di miocardite acuta con markers di miocardionecrosi positivi e pro-BNP elevato, M con enzimi cardiaci negativi ma pro-BNP notevolmente aumentato. A, che inizialmente non aveva
coinvolgimento cardiaco, ha avuto un rapido peggioramento clinico nei giorni seguenti, con positivizzazione dei markers di miocardionecrosi e con disfunzione ventricolare, dapprima destra e, in seguito, biventricolare. La sierologia per Parvovirus
di S e M mostrava IgG positive e IgM dubbie; per A, invece, IgG negative e IgM positive. In tutti e tre i casi la ricerca del DNA virale, tramite PCR, è stata dirimente per la diagnosi perché evidenziava da subito la presenza del Parvovirus B19
nel plasma: S 3783 IU/ml, M 75242 IU/ml, A 2453701 IU/ml. Tutti sono stati trattati per scompenso cardiaco e hanno avuto decorso clinico non lineare. S ha anche presentato neutropenia secondaria all’infezione (130/uL). A è deceduto dopo due
settimane dall’esordio della sintomatologia. Le due bambine sono in attesa di trapianto cardiaco
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
Clinically relevant pleiotropic effects of statins: drug properties or effects of profound cholesterol reduction?
No full textClinical trials have firmly established that 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) can induce the regression of vascular atherosclerosis and reduce cardiovascular-related morbidity and death in patients with and without coronary artery disease. It is usually assumed that these beneficial effects are due to the ability of statins to reduce cholesterol synthesis. However, because mevalonic acid is not only the precursor of cholesterol but also of many non-steroidal isoprenoid compounds, the inhibition of HMG-CoA reductase may lead to pleiotropic effects. As shown by the data reported in this review, some statins can interfere with major events involved in the formation of atherosclerotic lesions, regardless of their hypolipidemic properties. The relevance of these effects in humans remains to be established (particularly in view of the high statin doses required to produce a direct vascular action), thus their contribution to the reduction in cardiovascular events observed in clinical trials has become one of the major challenges for future studies aimed at clarifying the anti-atherosclerotic benefits of statins
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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