1,721,136 research outputs found
Comparison of different optimum criteria for sensor placement in lattice towers
No full textPlacing sensors at appropriate locations is an important task in the dynamic assessment of the mechanical systems, and its role is central in structural health monitoring. All sensors have to be placed on the structure so that all sought system features be obtained from the experimental tests. Sensor network design is rather diffused in laboratory applications, but there are scarce investigations on real civil structures, and they are not so well documented. In order to give a contribution in this framework, the present paper deals with the optimal sensor placement problem in lattice towers. With reference to six of the most diffused existing optimum criteria and according to mechanical and energetic formulations, several sensor network configurations are calculated for two broadcasting antennas, adopted as benchmark cases of studies. The final topological configurations of the networks are compared, and the most relevant differences are discussed. Moreover, the information content behaviour is computed to investigate the connection between sensor network topology and its ability to withstand the presence of undesired signals (e.g., noise) during the measurements. The results illustrated here may be useful for sensor network design for this special class of structure
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
Analisi fuzzy della durabilità di strutture in cemento armato soggette ad attacchi di cloruri = Fuzzy reliability analysis of reinforced concrete structures subject to pitting corrosion
No full textOn the comparison of optimum criteria for sensors placement in lattice towers: two cases of study
No full textPlacing sensors at appropriate locations is an important task in the dynamic assessment of the mechanical systems
and its role is central in structural health monitoring. All sensors have to be placed on the structure so that all
sought system features be obtained from the experimental tests. Sensors network design is rather diffused in
laboratory applications, but there are scarce investigations on real civil structures and they are not so well
documented. In order to give a contribution in this framework, the present paper deals with the optimal sensors
placement problem on lattice towers. With reference to six of the most diffused existing optimum criteria and
according to mechanical and energetic formulations, several sensors network configurations are calculated for two
example broadcasting antennas, adopted as benchmark cases of studies. The final topological configurations of the
networks are compared and the most relevant differences are discussed. Moreover, the information content
behaviour is computed to investigate the connection between sensors network topology and its ability to withstand
the presence of undesired signals (e.g., noise) during the measurements. The results here illustrated may be useful
for sensors network design for this special class of structure
Usura di utensili rivestiti: analisi con prove di taglio a norma ISO
No full textPresentiamo una metodologia sperimentale
utilizzabile per valutare, in accordo con
gli standard internazionali (la norma ISO
8688-1), i principali fenomeni di usura tipici
delle lavorazioni ad asportazione di truciolo.
In particolare, sono state eseguite dagli
autori prove di fresatura frontale a secco
su un centro di lavoro verticale, utilizzando
un utensile da taglio a inserti in carburo
di tungsteno/cobalto; le prove sono state
eff ettuate utilizzando sia utensili non rivestiti
che utensili rivestiti (con due diff erenti
valori dello spessore) tramite un coating
monolayer costituito da nitruro di titanio
depositato per via fi sica da fase vapore. La
suddetta metodologia è risultata dunque
idonea a valutare le prestazioni tecnologiche
dei rivestimenti per utensili da taglio,
permettendo di diagrammare e quantifi care
l’evoluzione temporale dell’usura al variare
della tipologia e/o caratteristiche dell’utensile
impiegato
Analisi fuzzy della durabilità di strutture in cemento armato soggette ad attacchi di cloruri = Fuzzy reliability analysis of reinforced concrete structures subject to pitting corrosion
No full textRivoluzioni costituenti, immaginazione politica e consenso
No full textL'articolo propone una lettura delle "rivoluzioni" come processi storici cruciali per studiare le premesse, la genesi e l'impatto di rapide trasformazioni di sistemi di credenze, simboli, abitudini e condotte di vita
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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