1,721,051 research outputs found
Contrappeso per il bilanciamento di un corpo rotante o per appesantire un corpo, e suo procedimento
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Studio e analisi di trattamenti barriera ai grassi a base naturale per applicazioni nel food packaging
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OctTES/TEOS system for hybrid coatings: real-time monitoring of the hydrolysis and condensation by Raman spectroscopy
No full textThe hybrid organic–inorganic system Tetra-ethyl-ortho-silicate functionalized with Octyl-triethoxy-silane, studied as protective\ud
coating for the preservation of historical glasses from the environmental weathering agents, has been characterized by\ud
Raman spectroscopy by monitoring the sol-gel reactions over time through characteristic features in the spectrum. In particular,\ud
for the hydrolysis reaction the disappearance of the 653 cm-1 (Si-O symmetric breathing) and 810 cm-1 (CH2 rocking in\ud
Si-alkoxides) peaks and the growth of the 710 cm-1 band, because of hydrolyzed alkyl-silane, and of the 881 cm-1 peak\ud
(ethanol C–C symmetric stretching) have been checked. Moreover, the condensation reaction can be tracked by the disappearance\ud
of the twomain peaks of the alcohols at 816 and 881 cm-1, going along with the growth of the broad band between\ud
250 and 500 cm-1 (Si–O–Si symmetric bending) and of the feature at 840 cm-1 (Si–O–Si stretching). At the end of the condensation\ud
process the Raman spectrum still displays spectral bands unique to the alkyl chain in Octyl-triethoxy-silane, in the\ud
1330–1450 cm-1 and 2725–3000 cm-1 range
Rivestimenti idrorepellenti a base di polisilossani e nanoparticelle di silice per la protezione di manufatti lapidei
No full textIl degrado dei materiali lapidei usati nella realizzazione di monumenti è dovuto soprattutto alla corrosione chimica da parte degli inquinanti atmosferici, ai cicli di gelo-disgelo e alla cristallizzazione di sali. Per prevenire il deterioramento della pietra è necessario eliminare o ridurre la penetrazione dell’acqua. Particolare attenzione, per aumentare l’idrorepellenza mantenendo la permeabilità al vapore, è stata data a materiali compositi ottenuti introducendo nanoparticelle di ossidi in matrici polimeriche organiche, ibride o silossaniche.
In questo lavoro si presenta uno studio sull’idrorepellenza di coating protettivi, applicati su calcare, arenaria e granito, ottenuti tramite processo sol-gel a partire da un prodotto silossanico e nanoparticelle di silice funzionalizzate con gruppi alchilici commerciali.
Le nanoparticelle e la matrice silossanica sono stati caratterizzati tramite spettroscopia Raman e le proprietà di idrorepellenza studiate con misure di angolo di contatto statico. Sono state svolte prove di assorbimento d’acqua per capillarità e misure colorimetriche
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
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