1,720,957 research outputs found
(p, alpha) reactions on 1p, 2s-1d shell nuclei
No full textThe 12C(p, α)9B and 32S(p, α)29P reactions have been studied at incident energies of 42.77 and 41.9 MeV, respectively. The experimental (p, α) relative cross sections are well reproduced by distorted wave direct pickup calculations with a semimicroscopic form factor and current shell model wave functions. A comparison between (p, α) and (3He,d) spectra on 1p and 2s-1d shell nuclei, leading to the same final nucleus, shows a clear evidence of a dominant pickup process over the knockout mechanism in the dynamics of the (p, α) reaction
Nebbia e perdita di efficienza nella guida automobilistica: attuale e possibile prevenzione sul conducente
No full textAnalisi della sensibilità al contrasto a duplicazione di frequenza (Dinamica) in soggetti in possesso di patente di guida automobilistica
No full text
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
Efficacia di un integratore dietetico nel miglioramento della funzionalità retinica in soggetti diabetici. Studio dell'elettroretinografico
No full textNel presente studio si è valutata l'efficacia di un integratore polivitaminico su soggetti affetti da NIDDM mediante metodiche di esame elettrofunzionale. Si sono esaminati 50 pazienti affetti da NIDDM di cui 11 con segni iniziali di RD background (grading 1 secondo la Etdrs Airlie House classification modificata), 39 pazienti privi di segni oftalmoscopici di RD (grading 0). I pazienti hanno assunto una capsula al giorno per un mese di un integratore polivitaminico contenente vitamina E, C, antocianidine, polifenoli e luteina.
Tutti i pazienti sono stati sottoposti ad esame elettroretinografico (Erg) con il calcolo della funzione intensità-risposta esaminata matematicamente con l'equazione di Naka-Rushton, prima e dopo terapia. Risultati: dopo terapia la massima ampiezza raggiunta dall'Erg (Vmax) in 32 pazienti ha ottenuto un miglioramento statisticamente significativo; in 13 pazienti ha ottenuto una variazione non significativa, in 5 pazienti un peggioramento. La significatività statistica dei risultati valutata mediante test t di Student per dati appaiati a due code è dello 0,029 t = 2,21 P < 0,05. Il significativo miglioramento è stato ricondotto a un effetto diretto sul metabolismo fotorecettoriale e ad un' azione sul microcircolo retinico.In this report the effectiveness of a polivitaminic integrator in NIDDM patients is evaluated with electrofunctional examination. 50 NIDDM patients are evaluated: 11 with initial signs of background diabetic retinopathy (Grading 1 of ETDRS Airlie House classification modificated), 39 without ophthalmoscopic signs of DR (grading 0). All the patients are treated with 1 capsule per day for 1 month of a polyvitaminic integrator with C, E vitamins antocianidine, polifenoli and luteine. The patients are examined with electroretinogram (Erg) using the Naka-Rushton equation, before and after therapy. Results: after therapy the maximum amplitude of Erg (Vmax) is increased in 32 patients, non significant trend in 13, decreased in 5 patients. The statistical significance of the results is evaluated with Student' s t-test for coupled data double end is 0.029 t = 2.21 P < 0.05. The improved statistical significance is probably due to a direct effect on photoreceptorial metabolism and action...
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
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