1,720,959 research outputs found
Avanzamenti : il DVD
No full textSi potrebbe dire che non vi sia quasi ricerca condotta dall'Archivio di Etnografia e Storia Sociale (AESS) nelle montagne lombarde, dall'inizio degli anni '70 in avanti, che non abbia incontrato, a vario titolo, la presenza significativa del 'ferro': i passaggi, le convivenze, le persistenze di vari modi di produzione - preindustriali, industriali, postindustriali - che hanno segnato l'arco di un secolo. Nei luoghi che hanno praticato attività di estrazione o di trasformazione del ferro si sono trovati i materiali etnografici più interessanti, le comunità più sensibili alla 'conservazione' di elaborati folklorici, gli informatori più straordinari: per i repertori canori, per i carnevali, per la ritualità religiosa e, naturalmente, per molti saperi tecnici specialistici. Di 'ricerca' si parla dunque in questo libro, sul campo e d'archivio: di memorie orali, di immagini e di suoni, di riflessioni sulla cultura di gruppi sociali (minatori, artigiani, operai), attraverso punti di vista che rappresentano la molteplicità di interessi e competenze con cui, sul territorio, si sono affrontate e si affrontano problematiche complesse di conservazione, interpretazione e fruizione di documenti, materiali e immateriali.
Con contributi di Angelo Bendotti, Graziella Pedretti, Carolina Lussana, Maria Costa, Maddelena Cerletti, Alberto De Cristoforo, Primo Ferrari e Bruno Pianta che amplia, in una articolata riflessione sulla cultura operaia e proto-operaia, i risultati raggiunti in una pionieristica ricerca realizzata nel 1972 sui minatori della Valtrompia che, ripubblicata ora nel volume, è all’origine dei successivi studi etnografici sulla miniera e sul mondo della lingera in Lombardia. Le immagini d'autore, introdotte da Roberta Valtorta, appartengono alla vasta raccolta di AESS (Maurizio e Federico Buscarino, Pepi Merisio, Ferdinando Scianna) e dell'Archivio del Lavoro di Sesto S. Giovanni (Silvestre Loconsolo).
Allegato al volume un CD, con la riproposta del repertorio della famiglia Bregoli, e un DVD con una "videoballata" che, realizzata da Guido Bertolotti, Elisa Piria e Diego Ronzio, si ispira idealmente alle 'radio ballads' create da Ewan MacColl, Peggy Seeger e Charles Parker nel 1958 per la BBC
Stochastic energy diffusion of electrons in a plasma by an electron cyclotron wave
No full textThe investigation of the energy diffusion process of the electrons in a magnetized plasma due to an electron cyclotron wave in perpendicular propagation with respect to the magnetic field is performed. Starting from the description of the relativistic electron motion by means of an actionâ angle Hamiltonian H(I,θ,t), the Fokker–Planck–Kolmogorov (FPK) approach to the diffusion is considered for a globally stochastic regime of the system. In this regime, the phase correlation process is analyzed, and the characteristic decay time is estimated analytically. The action diffusion coefficient D(I) is derived and compared with a local quasilinear expression. With explicit reference to the lowâ density regime, where D increases with I, and is very close to the quasilinear coefficient, the solution of the diffusion equation is compared with the results obtained by direct numerical integration of the motion equations for a statistically significant ensemble of particles. A good agreement with the local quasilinear FPK diffusion is observed. In addition, when the amplitude of the perturbation is varied, oscillations of the average action values around the quasilinear results are found on the long time scale
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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