1,721,032 research outputs found
Velocity-Gradient Probability Distribution Functions in a Lagrangian Model of Turbulence
No full textThe Recent Fluid Deformation Closure (RFDC) model of lagrangian turbulence is recast in path-integral language within the framework of the Martin-Siggia-Rose functional formalism. In order to derive analytical expressions for the velocity-gradient probability distribution functions (vgPDFs), we carry out noise renormalization in the low-frequency regime and find approximate extrema for the Martin-Siggia-Rose effective action. We verify, with the help of Monte Carlo simulations, that the vgPDFs so obtained yield a close description of the single-point statistical features implied by the original RFDC stochastic differential equations
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
The PTFE grafts as alternative blood access in the surgical management of long-term haemodialysis.
No full textVariations 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
MODIFICAZIONI CARDIOVASCOLARI NELL'ATTIVITà SPORTIVA SUBACQUEA
No full textQuesto capitolo non si limita ad elencare in maniera schematica le patologie che controindicano l’attività subacquea e neanche vuole essere un trattato esaustivo della medicina sportiva subacquea, ma soltanto un compendio rapido e veloce da poter consultare. Le problematiche cardiologiche dovute all’iperbarismo sia in condizioni fisiologiche che patologiche verranno di seguito elencate e discusse seguendo un percorso che interesserà sia la fisica che la fisiologia ma che insieme potrà farci capire meglio le patologie che il disbarismo può provocare. L’attività subacquea è in continua espansione non solo nel campo delle immersioni sportive ricreative e tecniche, ma anche in ambito professionale che spazia dalla ricerca scientifica a quelle archeologica, alla speleosubacquea con immersioni effettuate in mare, nei fiumi o nelle sorgenti. Tutto ciò ha indotto le ditte commerciali a realizzare attrezzature tecnologicamente sempre più avanzate e più sicure, al fine di migliorare le prestazioni del subacqueo, consentendo di raggiungere profondità sempre maggiori ed allungando la permanenza in acqua. L’attività subacquea con autorespiratori comporta, al giorno d’oggi, uno sforzo fisico modesto, ma in determinate condizioni si può avere la necessità di aumentare la performance sia a livello fisico che psichico per cui lo sportivo deve disporre di una buona riserva energetica per evitare di incorrere in condizioni di aumentato rischio. Lo studio delle modificazioni fisiologiche e delle possibili patologie correlate con la pratica dell’attività subacquea, d’altra parte, costituisce una sfida costante per la medicina iperbarica. L’integrità di tutti gli organi e apparati e principalmente dell’apparato cardiocircolatorio è di fondamentale importanza nello stabilire l’idoneità fisica del subacqueo, pertanto la valutazione cardiologia non deve basarsi solo sul tracciato elettrocardiografico ma deve essere globale e guidata da un’accurata anamnesi particolarmente attenta alla ricerca di familiarità per le malattie cardiovascolari che devono sempre costituire un campanello d’allarme per il medico esaminatore. Nell’attività subacquea, infatti, ancor più che negli altri sport, a causa dell’ambiente straordinario in cui si svolge, ogni precedente cardiovascolare e ogni cardiopatia, anche se asintomatica, possono rappresentare una controindicazione
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