1,720,964 research outputs found
Proprieta' meccaniche e microstrutturali di giunti "friction stir welded" in lega d'alluminio
No full text
Acciai inossidabili superaustenitici: microstruttura e resistenza a fatica di giunzioni saldate
No full textVengono analizzati nell'articolo microstruttura e resistenza a fatica di giunzioni saldate in acciaio inossidabile superaustenitico
Superaustenitic stainless steels: the microstructure and fatigue strength of welded joints
No full textMicrostructure and and fatigue behaviour of superaustenitic stainless steels weldmens are analysed and correlated
Preliminary results in the use of synchrotron radiation for small cracks and defects investigation in AA FSW samples
No full textA very good definition of defects position and dimension in welded joints is desirable for application of
fracture mechanics techniques and improvement of industrial acceptability criteria. This paper illustrates the
preliminary results obtained in the investigation of defects in aluminum welded joints at SYRMEP beamline of the
Elettra synchrotron radiation facility in Trieste (Italy). The novel PHase Contrast (PHC) imaging technique
consents a definition of the defects better than the one achievable with conventional welded joints control methods
such as ultrasonic techniques, acoustic emission and radiography
Small cracks and defects in aluminium FSW samples: preliminary investigation by means of synchrotron radiation
No full textImprovement of industrial acceptability criteria depends both on the verification of the defects visible with conventional techniques and the determination of the relationship between the residual life and the defect geometry, which in turn require a high definition of the defect dimension and position.
While fracture mechanics is a well-established technique for relatively long cracks, very little is known at the moment relatively to the early development of small crack, that is the transition phase from the onset stage to the propagation stage of the crack growth. The assessment of fracture mechanics techniques for small crack problems depends strongly on a high definition of defect location and geometry.
In order to overcome these problems, we started to investigate whether a good definition of defects position and dimension was achievable using the novel phase sensitive imaging techniques available at SYRMEP beamline, Elettra, with encouraging results
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
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