Search results for "Wooden"
showing 10 items of 71 documents
La traduzione costruttiva lituana negli edifici di culto in legno tra i secc. XVIII e XIX
2014
Lithuania is situated in a highly forested Northeastern Europe area and has a variety of wooden buildings. Among the wooden structures we enumerate the religious buildings, churches and bell towers, rich of historic values, presenting different forms and sizes, a complex design and stratified construction phases. The present work aims to study this interesting topic and intends not only to analyze the architectural typology but even more the technological and structural aspects, that had suggested the most influences on building techniques during the centuries.
Wooden churches in Lithuania : analysis of failures and degradations, guidelines for restoration
2016
La maggior parte degli edifici di culto in legno lituani versa in una penosa condizione di degrado, poiché le comunità locali non sempre rivolgono la dovuta attenzione ai fenomeni di dissesto e degrado e spesso le competenze tecniche capaci di salvaguardare tale patrimonio sono andate perdute. Le cause più frequenti di questo stato di fatto derivano da una inadeguata manutenzione (sia ordinaria che straordinaria), dal deterioramento del legno (ascrivibile per lo più ad infestazioni di funghi e insetti) o da dissesti e stati deformativi delle strutture dovuti ad errori nella tecnica costruttiva o all’errato dimensionamento delle sezioni costitutive degli elementi di base delle singole unità …
La ricostruzione dell'abside in alcuni esempi della seconda metà del XVI secolo a Palermo
2015
Il contributo ha l’obiettivo di studiare alcuni casi di ricostruzione dell’abside eseguiti in edifici chiesastici palermitani nella seconda metà del XVI secolo. Si tratta delle chiese di San Sebastiano, San Francesco d’Assisi e San Martino delle Scale (all’interno dell’omonima abbazia), in cui, nella seconda metà del Cinquecento, per motivi liturgici, l’abside originaria viene “trasformata”, in un’abside “piatta”, al fine di potervi inserire il Coro ligneo. Il nuovo posizionamento del Coro, in conseguenza della Riforma tridentina - problematica centrale nell’Europa di età moderna – suscita, anche in questi casi palermitani, dibattiti e controversie. Il cambiamento della forma dell’abside de…
Electronic paramagnetic resonance power saturation of wooden samples
2009
The deterioration of wood used for artifacts of artistic interest involves the production of different free radicals from the macromolecules of the wooden matrix (cellulose, lignin, and hemicellulose). Among the techniques able to provide information about these free radicals, the contribution of electronic paramagnetic resonance (EPR) can be very valuable. In this paper, the study of EPR signals (with g 2) of both modern and ancient wooden taxa was undertaken in order to analyze some features of the free radicals in natural wood. In particular, we have studied the microwave power saturation behaviors of seasoned wooden samples from ten species, and we have found remarkable differences betw…
Investigation on a low environmental impact solvent mixture applied to a wooden painted slab
2016
Cleaning is one of the most complex and delicate step in a restoration project, often due to the manufacturing techniques of the artifacts and their advanced state of decay. Eco-friendly solvents can permit to execute the cleaning operations with a reduced health impact for the restorers and for the environment. In this work, the performance of the 1,3- dioxolane/methylal (DIOX-MET) solvent mixture is evaluated over a wooden painted slab that had been covered with a thin layer of a protective varnish, probably during a previous conservation work performed in the Sixties. Removal of this varnish has been considered on behalf of its yellowing degradation process, which caused chromatic change…
Microbial strategies to improve the final quality of traditional Sicilian cheeses
Polyphasic Characterization of Microbiota of “Mastredda”, a Traditional Wooden Tool Used during the Production of PDO Provola dei Nebrodi Cheese
2021
The biofilms of the wooden tables used for the acidification of the curd were investigated for PDO Provola dei Nebrodi cheese, a traditional stretched cheese made in eastern Sicily (southern Italy) from raw cows’ milk. To this purpose the wooden tables of four dairy facilities were analysed for their microbiota by scanning electron microscopy (SEM) analysis and a combined culture-independent and -dependent microbiological approach. SEM inspection showed an almost continuous biofilm formation. MiSeq Illumina analysis identified 8 phyla, 16 classes, 25 orders, 47 families and 50 genera. Corynebacterium, Bifidobacterium and lactic acid bacteria (LAB) were detected in all samples. In particular…
Nanocomposites based on esterified colophony and halloysite clay nanotubes as consolidants for waterlogged archaeological woods
2017
We have designed an innovative protocol for the consolidation of waterlogged archaeological woods by using acetone mixtures of halloysite clay nanotubes and a chemically modified colophony (Rosin). Firstly, we have investigated the thermal properties of HNTs/Rosin nanocomposites, which have been prepared by means of the casting method from acetone. The HNTs content have been systematically changed in order to study the influence of the inorganic filler on the thermal stability and glass transition process of Rosin. We have observed that the thermal properties of the hybrids are affected by the specific HNTs/Rosin interactions. Then, acetone dispersions of HNTs/Rosin composites at variable f…
Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria, Sicily (Italy)
2017
ABSTRACTIn this work, the decision-making process involved in the restoration of the eighteenth century paliotto ligneo (wooden altar frontal) della chiesa del Santissimo Crocifisso all’Albergheria of Palermo is presented. Earlier research concerning mirror restoration was based on only a few case studies and the proposed techniques were not suitable for the artwork here. As a consequence, it was necessary to re-examine theories and protocols of modern restoration to plan an appropriate intervention of the altar frontal. Since in this artwork the role of mirrors is not to give back images, as usual, but rather to create special light effects and play of lights, this work aims to find an app…
CONSERVATIVE RESTORATION OF TWO WOODEN ARM RELIQUARIES (18TH CENTURY) FROM PALERMO’S CATHEDRAL
2016
The scientific investigations preliminary to the restoration of two golden wooden reliquaries, from Palermo's Cathedral, are reported in this work.