1,721,084 research outputs found
Non solo storia. Saggi per Camillo Brezzi
No full textIl libro raccoglie venticinque saggi, realizzati da docenti della Facoltà di Lettere e Filosofia di Arezzo come omaggio a Camillo Brezzi, in occasione del suo settantesimo compleanno
Strategie di integrazione nel discorso istituzionale in Germania
No full textOggetto del contributo è l???analisi linguistica dei Politikberichte [Rapporti Politici] prodotti annualmente dal Nationaler Kontaktpunkt in Deutschland im Europäischen Migrationsnetzwerk [Punto di Contatto nazionale della Rete Europea della Migrazione] .
L???analisi è stata condotta sia in termini quantitativi che qualitativi. Con l???aiuto del software AntConc , è stata creata una liste di frequenze che raggruppa tutti i lemmi dei Rapporti Politici fra i quali sono state isolate ed analizzate una selezione di occorrenze, delle quali si sono poi analizzate le stringhe testuali. Si è giunti in tal modo ad individuare le principali linee di azione politica della Repubblica Federale Tedesca in materia di Immigrazione/Integrazione nonché le finalità con le quali queste vengono intraprese, e ad ipotizzare in conclusione l' "Assimilation" come modello di integrazione al quale sembra riferirsi lo Stato tedesco. Tale modello deve esssere comunque inteso, secondo quanto ipotizzato dal sociologo tedesco Hartmut Esser in materia di modelli di integrazione, come processo che semplifica l???insorgere di un sentimento di appartenenza e crea possibilità di identificazione del migrante con i valori della società tedesca
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
Rayleigh wave dispersion curve inversion via genetic algorithmsand Marginal Posterior Probability Density estimation
No full textSurface wave dispersion curve inversion is a challenging problem for linear inversion procedures due to its highly non-linear nature and to the large numbers of local minima and maxima of the objective function (multi-modality). In order to improve the reliability of the inversion results, we implemented and tested a two-step inversion scheme based on Genetic Algorithms (GAs). The proposed scheme performs several preliminary “parallel” runs (first step) and a final global run using the previously-determined fittest models as starting population.
In this work we focus on the inversion of shear-wave velocity and layer thickness while fixing compressional-wave velocity and density according to user-defined Poisson's ratios and velocity–density relationship respectively. The procedure can nonetheless perform the inversion under different degrees of regularization, depending on the a priori information and the desired degree of freedom of the system.
Thanks to the large number of considered models, in addition to the fittest model, a mean model and its accuracy are evaluated by means of a statistical approach based on the estimation of the Marginal Posterior Probability Density (MPPD).
We tested the proposed GA-based inversion scheme on three synthetic models reproducing a complex structure with low-to-moderate velocity cover (also including a low-velocity channel) lying over hard bedrock. For all the considered cases the bedrock velocity and depth were properly identified, and velocity inversion was reconstructed with minor uncertainties.
The performed tests also investigate the influence of the first higher mode, the reduction of the frequency range of the considered dispersion curve as well as the use of different number of strata. While a limited frequency range of the dispersion curve (maximum frequency reduced from 80 to 40 Hz) does not seem to significantly limit the accuracy of the retrieved model, the adoption of the correct number of strata and the addition of the first higher mode help better focus the final solution.
In conclusion, the proposed approach represents an improvement of a purely GA-based optimization scheme and the MPPD-based mean model typically offers a more significant and precise solution than the fittest one.
Results of the inversion performed on a field data set were validated by borehole stratigraphy
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
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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