1,721,121 research outputs found
La perlina mancante. Poesie di un dog soldier scritte in esilio
No full textRaccolta di poesie inedite del poeta cheyenne Lance Henson. Prefazione, curatela, traduzione di poesie inedite e nota biografica a cura di Mariella Lorusso. In ogni creazione di un artigiano cheyenne la sapienza e la cura donate alla realizzazione di un oggetto vengono percepite come un atto sacro. Che si tratti di un mocassino ricamato di perline, di una cintura, di un disegno su una borsa di pelle, di uno scialle, di un dipinto o di una poesia, i disegni sono dotati di riferimenti mitologici e metafisici. Quando tali oggetti vengono creati per essere venduti a persone non-cheyenne qualcosa nel disegno viene intenzionalmente omessa. Questa si chiama “perlina mancante”
Un popolamento monumentale di Taxus baccata nel Parco Regionale dei Nebrodi (Sicilia)
Full text linkViene riportata l’individuazione un inedito popolamento di Taxus baccata, che per età e caratteristiche dendrometriche viene inquadrato nella tipologia di “popolamento monumentale”. Il biotopo si localizza all’interno del faggeto acidofilo delle pendici settentrionali di Monte Soro (Contrada Lenza Monica), a sud-est del Lago Biviere di Cesarò (7°56’47” Nord - 14°43’04’’Est) ed è posto a quota 1.330 m
Copropagating Raman pump unit to suppress four-wave mixing crosstalk between pump modes and WDM signals
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
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
Highly-saturated erbium-doped-fibre power amplifiers
No full textIt has not been generally appreciated that the erbium-doped fibre amplifier (EDFA) has both a saturation output power which increases with pump power, as well as an ability to operate deep in saturation without signal distortion and interchannel crosstalk. The latter is a consequence of its slow gain dynamics and is quite different from diode-amplifier behaviour. Most investigations of the gain characteristics of EDFAs to date have concentrated on the small input signal regime and attempted to obtain high unsaturated gain for low-pump powers, an attribute which is required for an in-line amplifier. By contrast, in this paper we discuss the application of EDFAs as power (post) amplifiers where the input signal is large and the amplifier saturation behaviour outlined above can be exploited. In the highly-saturated regime we have obtained near quantum-limited pump to signal conversion efficiencies, resulting in 55mW (17.4dBm) of amplified signal for only 100mW of pump power at 978nm. Operating in this mode EDFAs are attractive for application as power amplifiers to ease power budget restrictions in point-to-point digital links, video distribution networks and LANs
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