9762 papers found
A methodology based on pulsed electromagnetic radiation in an unlicensed radiofrequency band is proposed to eliminate biodeteriogens from biofilms encrusting canvas of artistic interest. Molecular techniques allowed to identify species of bacteria and microfungi in the biofilms. Experimental results showed that the area covered by biofilm disappeared after exposure over five days.
With the primary aim to improve the collaboration between scientific communities working in the field of Cultural Heritage protection and conservation, the ENEA ICT team has developed a new methodology, based on the OwnCloud framework, named "E3S: ENEA Staging Storage Sharing". This architecture has been developed within the COBRA project and it provides the real time sharing of experimental data and videos, performed by shaking table for seismic protection at the Sustainable Innovation TEChnologies (SITEC) ENEA Casaccia R.C. laboratory. The paper shows an application of this methodology...
In this study, ToF-SIMS and u-Raman analyses have been employed to assess the feasibility of laser treatments as a selective, non invasive cleaning methodology for archaeological metallic artefacts. A Q-switched Yb:YAG fibre laser, operating at 1064 nm, has been used for the cleaning treatments, carried out in air and 18O rich atmosphere on an ancient bronze coin. The preliminary results show that laser cleaning treatment selectively removes the dangerous oxyhydroxy chlorides corrosion products without affecting the cuprite protective patina grown directly in contact with the metallic surface.
Electrochemical Impedance Spectroscopy and Scanning ElectroChemical Microscopy are employed to characterize innovative hybrid coatings, which can be proposed for the corrosion protection of cultural metallic artefacts. In this paper hybrid TEOS and Graphene Oxide epoxy coatings have been tested in view of their possible employment as protective coatings for archaeological iron artefacts. The coatings have been deposited on low carbon steel and exposed to aggressive solutions. The performance of EIS and ElectroChemical Microscopy have been compared with the final aim of investigating if the...
An in situ assessment of the conservation state of some bronze statues exposed outdoor has been carried out in Colombia, in the historical site surrounding the Puente de Boyacá. Electrochemical Impedance Spectroscopy (EIS) measurements have been performed by using a portable electrochemical interface and by using measuring probes, specifically designed to be capable of working also on slanted surfaces, to be non invasive, and to be removable without damaging the statues with the final aim of developing a long-lasting maintenance methodology for this important complex of Colombian bronze...
In recent decades, the need of preserving the cultural heritage is becoming very relevant due to an increase in frequency and in intensity of extreme natural events, which have recalled major attention by the Authorities on natural hazards associated. An important role, in the field of safeguard cultural heritage, is developed by structural and materials engineering. These disciplines conduct an essential role in the definition of risk and in the identification of interventions and technologies that can be used respecting the cultural value of asset. However, archaeological assets are...
In this study, the infrared thermography method (IRT) has been carried out to evaluate the water distribution into stone specimens in the laboratory, in order to simulate the same hydric behavior in real scale material systems in situ. Samples of sandstone and calcarenite have been tested by means of hydric tests under stable laboratory conditions (temperature and relative humidity). Capillary water absorption and evaporation transport phenomena, which are responsible of the majority of decay processes occurring in masonries, have been monitored through IRT. This technique allows to record...
The Textile Reinforced Mortar strengthening systems (TRM) seems to be one of the better solutions to reinforce the historical masonry structures. The study of the testing methods more appropriates to define the mechanical design parameters is actually of main interest for scientific community. The experimental research presented herein was carried out to define the effective bond length of a Basalt_TRM system applied to a homogeneous substrate. The use of the Digital Image Correlation (DIC) based on a cross correlation function has permitted to define the displacement and strain fields and...
The paper describes integrated geophysical investigations coupled with structural analysis and numerical simulation with the aim of study and evaluate seismic vulnerability of cultural heritage sites. The analysis consists in collecting data with noninvasive portable instruments to characterize local site effects as well as dynamic properties of the structure. We focus investigations on data collected at several locations in the Maltese Archipelago (central Mediterranean) and in some historical buildings located in Catania (Sicily).