1,721,250 research outputs found
UNO STUDIO DI CASO SULL’ELABORAZIONE E L’UTILIZZO DEL FEEDBACK SCRITTO IN APPRENDENTI DI ITALIANO L2
No full textAttraverso uno studio di caso che coinvolge due studentesse di italiano L2 di livello elementare/intermedio, si prendono in esame alcuni dei fattori che possono influire sull’utilizzo del feedback scritto da parte degli apprendenti. La raccolta dei dati si è svolta in tre giornate: nella prima le partecipanti hanno scritto un testo collaborativo a partire da una storia per immagini; nella seconda i testi, corretti con un intervento di feedback implicito, sono stati riconsegnati e la coppia ha prima analizzato le segnalazioni ricevute e poi riscritto il testo; nella terza le apprendenti hanno prodotto testi individuali a partire dallo stesso stimolo visivo. Oltre a confrontare le diverse stesure del testo, si analizzano le interazioni avvenute tra le apprendenti durante il lavoro di coppia finalizzato a utilizzare il feedback per produrre il secondo testo collaborativo. I risultati mostrano da un lato che un elevato livello di coinvolgimento nell’elaborazione del feedback non ne garantisce un utilizzo efficace, dall’altro che hanno un peso non trascurabile anche fattori più “personali” come le convinzioni sulla lingua bersaglio e l’atteggiamento nei confronti del lavoro di coppia
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
Direct Analysis of Three-Phase Induction Motor Considering Rotor Parameters' Variation and Stator Belt Harmonics Effect
No full textIn this article, a novel procedure for the induction motor analysis is presented, avoiding the time-domain finite element problem formulation. The proposed technique closely links the mathematical model of the motor to the finite element simulations, concerning magneto-static and time-harmonic analyses. The target of the method is to include, in a rapid machine computation, also the effect of the slip frequency on the bars' current distribution and the induced currents in the cage due to the stator belt harmonics. The reported analysis example concerns the stand still operation of a double cage induction machine, where the rotor frequency is the grid frequency and the high stator current intensifies the role of the belt harmonics. A further application example concerns a flux weakening working point of a single cage induction motor in a variable speed drive. The aim of this work is to propose procedures to get a fast prediction of the induction motor performance, including also the principal parasitic effects, e.g. the rotor bars' skin effect and the stator belt harmonics, without using any time-domain analysis
Electric drives for hybrid electric agricultural tractors
No full textThis paper provides a comprehensive overview on the main features of electric drives for hybrid electric agricultural tractors. Challenges regarding the design of electric machines and power converters for this application will be deeply discussed, and feasible proposals will be presented considering state-of-the-art electric power systems for automotive applications and heavy-duty working vehicles
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