1,721,037 research outputs found
Air-coupled ultrasound: a novel technique for monitoring the curing of thermosetting matrices
No full textA custom-made, air-coupled ultrasonic device
was applied to cure monitoring of thick samples (7–10 mm)
of unsaturated polyester resin at room temperature. A key
point was the optimization of the experimental setup in
order to propagate compression waves during the overall
curing reaction by suitable placement of the noncontact
transducers, placed on the same side of the test material,
in the so-called pitch-catch configuration. The progress of
polymerization was monitored through the variation of the
time of flight of the propagating longitudinal waves. The
exothermic character of the polymerization was taken into
account by correcting the measured value of time of flight
with that one in air, obtained by sampling the air velocity
during the experiment.
The air-coupled ultrasonic results were compared with
those obtained from conventional contact ultrasonic measurements.
The good agreement between the air-coupled
ultrasonic results and those obtained by the rheological
analysis demonstrated the reliability of air-coupled ultrasound
in monitoring the changes of viscoelastic properties
at gelation and vitrification. The position of the transducers
on the same side of the sample makes this technique suitable
for on-line cure monitoring during several composite
manufacturing technologies
Impiego di materiale riciclato derivante da pneumatici fuori uso nel calcestruzzo
No full textThe increasing amount of waste tyres worldwide makes tyres disposition a relevant problem to be solved. In the last years only a
limited quantity of waste tyres has been utilized for reconstruction and energy recovery, while the most part of them has been disposed into landfills. The European Union Landfill Directive aims to stop the landfill disposal of waste tyres, therefore the development of new markets for these products becomes fundamental. In the recent years some research works have been devoted to the use of rubber particles and
still fibers obtained from waste tyres in concrete; the available literature on this topic furnishes promising indications.
On the basis of the previous considerations an experimental investigation, still in progress, has been planned in order to analyze the
performances of concrete reinforced by RSF (Recycled Steel Fibers) obtained by waste tyres. First obtained results are reported and
discussed in this paper
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
Trasformazioni della Costituzione. Revisioni, mutamenti taciti e progetti falliti nella storia repubblicana.
No full text
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
“CARDANOL BASED COMPOSITE REINFORCED WITH NATURAL FIBRES”
No full text1ST INTERNATIONAL WORKSHOP ON NATURAL FIBERS COMPOSITES. 19-21 OTTOBRE 2003, ISCHIA (NA)
“A Natural fibre reinforced Biocomposite with a Cardanol based matrix”
No full text- 2ND INTERNATIONAL CONFERENCE ON ECO-COMPOSITES, (LONDRA, QUEEN MARY UNIVERSITY OF LONDON - 1-2 SEPTEMBER 2003
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