1,721,016 research outputs found
Conservare i murales outdoor: alcuni esempi romani.
No full textIl tema della conservazione in situ di opere murali outdoor è al centro, negli ultimi
tempi, di un accesso dibattito soprattutto in relazione al differente approccio
da adottare a seconda che l’opera sia un murale oppure un dipinto murale.
Fino a pochi anni fa l’interesse crescente per la conservazione della cosiddetta
“street art” ha portato alla ricerca di nuove metodologie e alla
sperimentazione di nuovi prodotti da applicare sulle opere al fine di garantirne
la durabilità nel tempo. Attualmente il restauratore/conservatore che
si trova di fronte ad un’opera di “Urban Art” deve adottare un approccio
conservativo molto più cauto ponendosi alcune questioni preliminari legate
alla reale necessità di proteggere e salvare le opere di arte urbana realizzate
da artisti che lavorano in ambienti esterni
Studio preliminare dei parametri termoigrometrici e delle loro variazioni all’interno della chiesa di S. Adriano in San Demetrio Corone (CS).
Full text linkGli obiettivi specifici di questa analisi microclimatica sono stati quelli di determinare gli andamenti di temperatura e umidità relativa all’interno della chiese di S. Adriano. Le differenze dei parametri misurati nel corso del tempo dovrebbero consentire successivamente di misurare le variazione tra l’ambiente e i manufatti, considerando che questi gradienti sono la principale causa di degrado delle opere d’arte, con conseguente formazione di flussi di calore e di vapore tra manufatto e ambiente esterno. Le modalità operative, in genere, consistono nell’effettuare campagne di misura significative per ogni stagione, tenendo conto che i dati vanno poi messi in correlazione ai periodi di rilevamento e, nelle 24h, in relazione all’ora in cui si effettua la misura. In questo studio si è preso in considerazione il periodo invernale, con rilevazioni che iniziano nel mese di novembre e che si concludono nel mese gennaio. Il range temporale qui riportato è di circa trenta giorni, considerando che i dati saranno poi integrati con le misure ancora in fieri nei siti in
esame. Dai dati rilevati è stato possibile seguire gli andamenti dei parametri di temperatura e umidità relativa sia nell’arco delle 24h (come misure puntuali e come medie delle misure su tutto il periodo in esame) che in tutto il periodo di rilevazione, con le medie calcolate giorno per giorno. In base all’elaborazione di queste misure, è stato possibile elaborare dei tracciati su sezione orizzontale delle chiese che visualizzano l’andamento dei parametri in esame
Protezione delle opere di Street art: materiali e metodi
No full textn recent years, the new conservation challenge consists to preserve contemporary mural paintings by Graffiti vandal-ism or tagging. Contemporary mural pantings are complex artworks for several reasons, including the heterogeneous materials used, the variation of varnishes, the different types of substrate. YOCOCU Organisation YOuth in COnservation of CUltural Hertiage and M.U.Ro Museo di Urban Art di Roma are developing a scientific research to define the issues of long-term care and maintenance of mural paintings and to evaluate the performance of different categories of protective coatings on these artworks. In particular this work is focused on preliminar results related to: a) the study of the interaction of antigraffiti on synthetic varnishes used by MURo to realize its artworks; b) the testing of effectiveness and efficiency of commercial products used to antigraffiti (polysiloxane, fluor-inated acrylic, polyurethane, microcrystalline waxes and fluori-nated polymers); c) the definition of the best system to remove simulate vandalism spray without damaging the painting.Laboratory specimens were realized and data obtained by optical and electronic microscope and colorimetric spectrophotometer
Epoxy Resin for the Slope Consolidation Intervention on the Tropea Sandstone Cliff (Southern Calabria, Italy)
No full textThe Tropea cliff (southern Calabria, Italy), affected by fast weathering processes and landslides, has needed various interventions of slope consolidation aimed at reducing hazard conditions. These interventions were performed with low environmental impact techniques in order to preserve the architecture and the landscape of the area. In 1998, a consolidant resin was tested on a limited portion of the Tropea sandstone cliff. The purpose of this test was checking the resin behavior against erosion processes. Previous researches showed a good resistance to erosion with only a slight opacification of the treated sandstone portion. This paper aims at studying the behavior of the consolidant resin after 17 years from its application. The research was performed by several laboratory tests. The Fourier transform infrared spectroscopy analysis has indicated that the consolidant product was an epoxy resin. The scanning electron microscopy analysis has shown that the resin has penetrated into the rock up to 2 mm. The chemical analysis further testified that the tested surface is characterized by higher content of soluble salts than the non-treated surface. The salt content is mainly related to the infiltration of water enriched in soluble salts, due to the marine aerosol. The soluble salts, crystallizing in the rock pores and between the mica sheets, produce an increase of physical stress that is responsible of the exfoliation processes of the resin. Therefore, the use of epoxy resin on the tested sandstone rocks increases the strength on the outer rock surface, with a consequent good resistance to erosion processes just in a restricted period. Overtime, water infiltration introduces dangerous soluble salts below the treated surface, causing salt crystallization with important exfoliation processes of the treated rock surface
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
Consolidating Properties Of Regalrez 1126 And Paraloid B72 Applied To Wood
No full textThis study is aimed at an assessment of the properties oftwopolymeric products applied toNorwayspruce
(Picea abies) and White poplar (Populus alba)woodspecies. It contributes to ongoing research experiments
on the consolidating properties of two synthetic resins and their potential synergic action on wood,
resulting from their different interaction with the substrate: Paraloid B72 and Regalrez 1126. Experiments
were carried out on a series of samples of the two wood varieties. The consolidants were applied alone and
one after the other, with one coat of Regalrez and then one of Paraloid. Porosity and variations in pore size
distribution were ascertained by mercury intrusion porosimetry (MIP). Colorimetric and IR spectroscopic
measurements were also taken before and after aging by solar radiation and freeze/thaw cycles, to verify
the possible slowing of photodegradation of the treated wood and the consolidating resistance. Results
confirm that both products penetrate the wood with a different behaviour. After double treatment with
Regalrez + Paraloid, a significant advantage was observed in terms of mechanical resistance and pore
size distribution, although no advantages as regards resistance to photo-oxidizing processes or colour
changes were observed
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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