1,721,057 research outputs found
Clinical and aberrometric evaluation of a new extended depth-of-focus intraocular lens based on spherical aberration
No full textPurpose: To compare the refractive, visual, and aberrometric results with a new extended depth-of-focus intraocular lens (EDOF IOL) based on alternating positive and negative spherical aberration in the central 3.0 mm optical zone and an aspheric monofocal IOL of the same platform.Setting: Ophthalmology, University Hospital of Verona, Italy.Design: Prospective case series.Methods: Cataract patients free from other ocular disease had bilateral implantation of the EDOF Mini Well IOL or the monofocal Mini IOL. Four to 6 weeks after second-eye surgery, the refraction, visual acuity, defocus curve, contrast sensitivity, and photic symptoms were assessed. Wavefront analysis was performed. The primary endpoint of was the amplitude of the dioptric interval for 0.1 logarithm of the minimum angle of resolution (logMAR) visual acuity. The secondary endpoint was an aberration comparison between the two IOLs.Results: The study comprised two groups of 25 patients each. The corrected distance visual acuity was better with the monofocal IOL by 0.02 logMAR (P = .03). The 0.1 logMAR dioptric interval was 2.0 diopters (D) for the EDOF IOL and 1.0 D for the monofocal IOL (P < .001). The mean CDVA at -2.0 defocus was 0.15 logMAR +/- 0.08 (SD) and 0.52 +/- 0.14 logMAR, respectively (P < .001). There was no difference in contrast sensitivity or photic symptoms. The optical aberrations at 4.0 mm and 6.0 mm aperture diameters were similar in the two groups.Conclusion: The EDOF IOL based on spherical aberration provided greater depth of focus than the aspheric monofocal IOL without increasing optical aberrations and with few photic symptoms. (C) 2019 ASCRS and ESCR
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
Gli elettori del Pd e del centro-sinistra: ritratto di una crisi
No full textIl volume è un lavoro dell’Associazione ITANES (Italian National Elections Studies), che conduce un programma pluriennale di ricerca sul comportamento elettorale e le opinioni politiche degli italiani. In particolare, il volume prende in esame gli esiti delle elezioni politiche del 2018 anche alla luce di inchieste campionarie su migliaia di elettori, condotte sia prima sia immediatamente dopo le consultazioni. Il capitolo parte dalla constatazione che, in occasione delle elezioni politiche italiane del 4 marzo 2018 sono state notevoli le dimensioni della sconfitta del Partito democratico (Pd), della coalizione elettorale di centro-sinistra da esso dominata e del centro-sinistra nella sua accezione più ampia (comprese le liste di sinistra non aderenti alla coalizione). Al fine di esplorare i motivi sotteso alla sconfitta, il testo si focalizza l’attenzione: a) sugli elettori che dichiarano di aver votato per il Pd nelle elezioni per la Camera dei Deputati del 2013, articolati in tre gruppi: coloro che dichiarano di aver votato di nuovo per il Pd nel 2018; coloro che nel 2018 hanno votato per +Europa oppure per Leu, abbandonando il Pd ma comunque rimasti entro il perimetro del centro-sinistra (nella sua accezione ampia); coloro che nel 2018 non si sono recati alle urne oppure hanno espresso una preferenza per una lista non di centro-sinistra dando quindi luogo a un abbandono del centro-sinistra; b) gli elettori del 2018 articolati in due gruppi: coloro che dichiarano di aver votato per il Pd; coloro che dichiarano di aver votato per Leu. Il mancato rinnovo, da parte degli elettori del Pd del 2013, della fiducia verso il partito in occasione del voto politico del 2018.non sembra essere dovuto in maniera preponderante da questioni sostantive, di policy. Fra coloro che non hanno più votato per il Pd si rilevano una maggiore sensibilità ai problemi dell’immigrazione e della criminalità, un atteggiamento più tiepido nei confronti dell’Europa e una percezione più sfavorevole della situazione economica del paese; ma l’entità dei divari non appare soverchiante. I fattori più discriminanti paiono essere la percezione della figura del segretario Matteo Renzi e l’orientamento verso la riforma costituzionale promossa dal governo da lui presieduto. È lecito ipotizzare che il comportamento di voto in occasione del referendum costituzionale del 2016 sia stato determinato non tanto dagli orientamenti sostantivi verso i contenuti della riforma sottoposta al giudizio dei cittadini quanto dal fatto che Renzi abbia voluto legare le sue fortune personali all’esito della consultazione. Rimane aperta la questione se sia possibile, e in che modo, per il Pd – specie senza un rinnovamento della sua leadership – recuperare l’"exit" o quanto meno la "voice"
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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