1,720,986 research outputs found
I nemici della rete. L'Italia sta perdendo la corsa al digitale. Tutti i colpevoli, per incapacità o interesse, di un disastro che ci costerà caro
No full textLe generazioni di italiani nate nel dopoguerra si sono formate culturalmente guardando la Tv. Le ultime, al contrario, si “informano” attraverso la rete. Fino ad oggi il potere si è esercitato attraverso l’uso dell’informazione e della conoscenza. Chi ne ha detenuto i mezzi ha potuto comandare. le idee senza essere più detentori di grandi mezzi di comunicazione. La rete, le piazze, l’esercizio della democrazia.
La rete è la moderna frontiera della libertà e della democrazia. Luogo che apre canali di condivisione e scambio, internet è un diritto irrinunciabile, e la sua tutela l’unità di misura di un Paese civile. Nella corsa al digitale, però, l’Italia è il fanalino di coda dell’Occidente e il ritardo accumulato rischia di condannare i nostri figli a crescere in un Paese del terzo mondo. Ma qual è il freno che ci tiene inchiodati al passato? A chi giova l’ostinazione all’arretratezza che risulta evidente nei rapporti tra potere e web
Calibration of the material parameters of a CFRP laminate for numerical simulations
No full textThe aim of present paper is to show a procedure to calibrate mechanical properties to be used in a finite element model for a carbon fibre-reinforced plastic laminate that use solid elements. A reduced experimental programme including tensile test, tensile test on specimen with a central hole, three-point bending test and three-point bending test on short beam test were carried out. Every test was numerically reproduced by means of an explicit solver. Properties are determined from the tensile test and unmodified for the other load scenarios which are used as validation benchmarks. Finally, it is demonstrated that the properties determined with the simple tensile tests can guarantee accurate results when adopted to simulate much more complicated stress patterns
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
Investigation about the structural nonlinearities of an aircraft pylon
No full textThe goal of the present work is to develop a high-fidelity nonlinear finite element (FE) model able to describe the mechanical response of an aircraft structure composed of a pylon, sway braces, and a store system with an applied external load. Unstable phenomena (such as limit cycle oscillations) on aircraft pylons have been shown to occur because of the presence of nonlinearities (structural and aerodynamic). Most previous investigations mainly focused on aerodynamic effects while almost neglecting structural effects. The present paper, however, focuses on the building and assessment of a nonlinear FE structural model of a pylon, starting from experimental evidence, showing that nonlinearities are concentrated in the joint between the pylon and the suspended store. The static results of the numerical model were assessed by means of an experimental stiffness test. The dynamical reliability of the model was assessed when linked to a delta cropped wing comparing its vibration modes with experimental values and with a linear model. The results demonstrate that the FE model is able to accurately replicate both the static and dynamic behavior of the system
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
Evaluation of the effects of the numerical modelling choices on the simulation of a tensile test on CFRP composite
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