1,720,960 research outputs found
Significato del reversed halo sign nei pazienti oncoematologici con neutropenia e febbre
No full textIl presente studio ha lo scopo di valutare la specificità del reversed halo sign (RHS) in pazienti oncoematologici neutropenici
febbrili e di esaminare il RHS in relazione allo stato immunitario
TC TORACE LOW-DOSE IN PAZIENTI EMATOLOGICI NEUTROPENICI FEBBRILI: COMPARAZIONE CON RX TORACE
No full textScopo
Valutare l’accuratezza di esami TC torace low-dose (LDCT) rispetto a RX torace nella valutazione di complicanze polmonari in pazienti ematologici con febbre antibiotico resistente.
Materiale e metodi
È stato svolto uno studio prospettico monocentrico, sono stati arruolati 50 pazienti ematologici febbrili ad alto rischio (BOscore >5) per patologia fungina invasiva polmonare che sono stati sottoposti a RX torace e LDCT (100 kV; 30 mAs) entro 48 ore dall’esordio febbrile. Una TC a dose standard (SDCT) eseguita sui reperti patologici della LDCT è stata usata come riferimento. Due radiologi con differente esperienza, non informati dei dati clinici dei pazienti, hanno analizzato indipendentemente gli esami RX e LDCT. Sono stati valutati l’accordo interosservatore (Kappa di Cohen), il risultato diagnostico di RX e LDCT ed i dati dosimetrici.
Risultati
L’accordo inter-osservatore è stato basso per le indagini RX (kappa: 0,367) ed alto (kappa: 0,925) per le indagini LDCT.Gli RX hanno dimostrato un risultato diagnostico scarso, lievemente migliorato dall’esperienza (sensibilità: 40 vs 51 %; specificità 29 vs 54%; PPV: 41
vs 57%; VPN: 29 vs 48% per il radiologo non esperto rispetto all’esperto). Le indagini LDCT hanno mostrato un alto rendimento diagnostico (entrambi i radiologi hanno individuato il 100% dei reperti LDCT), con differenze interpretative legate all’esperienza.La dose misurata per gli esami LDCT è stata di 0,75±0,15 mSv (vs 0,1 mSv per gli RX), corrispondente a circa 7/8 RX.
Conclusioni
Il rendimento diagnostico LDCT è più alto delle indagini RX nello studio delle complicanze polmonari in pazienti ematologici ad alto rischio con febbre antibiotico resistente, ed è ragionevole utilizzare indagini LDCT al posto di RX come sistema di screening maggiormente accurato
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
Design of a kite controller for airborne wind energy
No full textAirborne wind energy is a field of technology being developed to make use of the vast, renewable wind power resource which is above the reach of traditional wind turbines, without the need for a large tower. Much analytical research has been undertaken in recent years to better understand the problem space. However, there are relatively few working systems that demonstrate their functioning and can be compared with simulations and theory. Off-grid power systems still rely heavily on diesel generators, so devices that tap renewable energy sources with similar ease of deployment and lower cost of energy would help this sector to reduce its reliance on expensive, polluting, fossil fuels. The development of these systems is often performed by teams with business interests leaving little open access content available regarding the design process of such devices or the data that they provide. A kite control pod has been designed for the remote control of a standard kitesurfing kite and a prototype has been demonstrated stably flying such a kite on a fixed length tether. This pod and kite would be tethered to a winch and as the kite flies across the wind, the lift force generated is applied to the winch which is reeled out and electrical power generated. Once fully extended, the tether would be reeled in with the kite de-powered, using some of the generated energy, stored in a battery. This system can then be used as a test bed for the further development of a compact, autonomous, airborne wind energy system for off-grid applications
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