1,721,004 research outputs found
COVID-19: Studi sull'attività replicativa del virus e sull'attività antivirale del metotrexato
No full textCOVID-19: Studi sull'attività replicativa del virus e sull'attività antivirale del metotrexatoCOVID-19: Studies on the replicative activity of the virus and the antiviral activity of methotrexat
Hemispheric Asymmetry in Visual Processing: an ERP Study on Spatial Frequency Gratings
No full textAbstract: A hemispheric asymmetry for the processing of global versus local visual information is known. In this study, we investigated the existence of a hemispheric asymmetry for the visual processing of low versus high spatial frequency gratings. The event-related potentials were recorded in a group of healthy right-handed volunteers from 30 scalp sites. Six types of stimuli (1.5, 3 and 6 c/deg gratings) were randomly flashed 180 times in the left and right upper hemifields. The stimulus duration was 80 ms, and the interstimulus interval (ISI) ranged between 850 and 1000 ms. Participants paid attention and responded to targets based on their spatial frequency and location. The C1 and P1 visual responses, as well as a later selection negativity and a P300 component of event-related potentials (ERPs), were quantified and subjected to repeated-measure analyses of variance (ANOVAs). Overall, the performance was faster for the right visual field (RVF), thus suggesting a left hemispheric advantage for the attentional selection of local elements. Similarly, the analysis of the mean area amplitude of the C1 (60–110 ms) sensory response showed a stronger attentional effect (F+L+ vs. F−L+) at the left occipital areas, thus suggesting the sensory nature of this hemispheric asymmetry
App 2.0: strumenti per una didattica innovativa
Full text linkL’idea di descrivere in maniera sistematica un vasto insieme di app del Web 2.0 nasce all’interno di un
progetto di innovazione didattica dedicato alla formazione degli insegnanti di scuola di primo e secondo
grado.
Il progetto “Scuol@ 2.0: conoscere gli strumenti offerti dal Web e sperimentare una didattica innovativa” si
è svolto a Gorizia, nei laboratori informatici del polo universitario di Santa Chiara dell’Università di Udine,
nel febbraio/marzo 2016.Prefazione
L’idea di descrivere in maniera sistematica un vasto insieme di app del Web 2.0 nasce all’i
nterno di un
progetto di innovazione didattica dedicato alla formazione degli insegnanti di scuola di primo e secondo
grado.
Le pagine che seguono presentano una selezione di un centinaio di app, riportando
per ognuna di esse:
• il logo;
• il QR code per accedere alla pagina Web dell’app;
• la tipologia di app;
• la descrizione;
• i dettagli tecnici;
• le funzionalità e caratteristiche;
• esempi di prodotti e collegamenti a tutorial
Endogenous attention to object features modulates the ERP C1 component
No full textConverging neuroimaging and electrophysiological evidence supports the notion that selective attention can modulate neural activity not only in V1 (BA17) - as early as 40-60 ms post-stimulus - but also at subcortical level (thalamic lateral geniculate nucleus, LGN). V1 modulation has been documented both in space-based and (especially) object-based selection conditions, most of all in endogenous orienting paradigms. It seems then that an attentional modulation of ERP C1 response - reflecting V1 modulation - would not be especially favoured by exogenous cuing as far as object-based attention is concerne
Electrochemical and photophysical properties of two-component coordination compounds containing a metallocyclam and an Re-I(bipy)(CO)(3)Cl subunit
No full textThe two-component coordination compounds [Re-I(CO)(3)Cl(L)](2+) (L=Ni-II, Cu-II or Zn-II complex of the 1-(2',2"-bipyridyl-5'-yl-methyl)-1,4,8,11-tetraazacyclotetradecane ligand) were synthesized and their electrochemical and photophysical properties investigated and compared with those of the separate components. The influence on the oxidation potential of the ReI centre of the Cu-II and Zn-II neighbouring cations was found to be negligible. However, when Ni-II is coordinated by the cyclam ring (cyclam = 1,4,8,11-tetraazacyclotetradecane),its oxidation precedes that of Re-I, with significant consequences on the oxidation potential of the latter. Finally, the fluorescence of the rhenium-containing component was found to be dependent on the cation coordinated by the proximate cyclam ring: in particular, the Ni-II and Cu-II complexes quench the fluorescence completely, and the Zn-II complex does not. (C) 1998 Elsevier Science S.A. All rights reserved
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
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