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Grbic M.L.,University of Belgrade | Unkovic N.,University of Belgrade | Stupar M.,University of Belgrade | Vukojevic J.,University of Belgrade | Nedeljkovic T.,Central institute for conservation
Fibres and Textiles in Eastern Europe

Two silk artefacts from museum collections in Serbia, a silk icon from Petar Lubarda Legacy and a scroll made with traditional japanese techniques were analyzed for fungal presence. Fungi isolated from both the silk artefacts belonged to the genera Aspergillus, Chaetomium, Penicillium and Rhizopus. Actively growing colonies of Aspergillus and Penicillium species had caused chromatic alterations on the silk icon and their metabolic activity was demonstrated by high relative light unit values. In this research, measurement of the total microbial activity using the ATP bioluminescence method was used for the first time on silk artefacts and on textile in general. Scaning electron microscopy analysis of the scroll indicated that hyphae of Chaetomium globosum are capable of the mechanical deterioration of silk, as shown by the presence of cracks and gaps in silk fibres. This appears to be the first report of silk fibre degradation caused by C. globosum. © 2014, Institute of Biopolymers and Chemical Fibres. All rights reserved. Source

Milosavljevic A.,University of Zagreb | Petronic S.,Innovation Center | Polic-Radovanovic S.,Central institute for conservation | Babic J.,Military Technical Institute Belgrade | Bajic D.,University of Zagreb
Materiali in Tehnologije

Nickel-based superalloys are distinguished from other materials by their excellent mechanical and physical properties. As they are used at high temperatures and pressures, as well as in aggressive environments, their characteristics need constant improvement. An adequate choice of their chemical composition and the heat-treatment regime contributes to the improvement of the chemical, physical and mechanical properties of these nickel-based superalloy materials. During the heat treatments of the superalloys Nimonic 263 and Hastelloy S some changes in their microstructures were observed. In this paper the changes in the microstructures after various regimes of the heat treatment were analysed on the fractured surfaces. The fractured surfaces were observed using light microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectrometry (EDS). Source

Ristic S.,Institut Gosa | Polic-Radovanovic S.,Central institute for conservation | Katavic B.,Institut Gosa | Nikolic Z.,Institut Gosa | And 2 more authors.
Lasers in Engineering

This paper presents some results of laser beam interaction (ruby laser, Q-switch) with the contaminated surface of the Neolithic ceramics from Stubline in Serbia, which had been exposed to atmospheric and other conditions. The main aim was to determine a threshold of laser light energy density applied in cleaning and to test if the ruby laser with nominal energy of 1J can be applied simultaneously for cleaning of encrustations on the ceramic surface, and non-destructive tests of the cleaning process by holographic interferometry. The first step was to determine a threshold of the laser energy density applied in cleaning. The effects of the laser beam interaction were examined by scanning electron microscope (SEM) equipped with energy-dispersion spectroscope (EDS). © 2012 Old City Publishing, Inc. Source

Kozic M.S.,Military Technical Institute Belgrade | Ristic S.S.,Institut Gosa | Stetic Kozic S.M.,University of Belgrade | Polic S.R.,Central institute for conservation
Thermal Science

The level of pollution concentration to the archeological site Viminacium caused by the stack of Kostolac B power plant is analysed using CFD software. The wind is directed from the stack toward Viminacium-Archeological Site, Therma and Viminacium-Museum. Three different meteorological conditions resulting in fanning, fumigating, and looping plume are modelled. The temperature gradient as the most important factor defining the conditions of the atmosphere is included through the appropriate boundary conditions. It is shown that concentrations of the pollutants on the objects of Viminacium are very low. It can be attributed to the stack height and high temperature of the smoke at its exit. It also indicates that other sources of pollution such as open ash dumps and acid rain should be checked. Source

Ristic S.,Institut Gosa | Polic-Radovanovic S.,Central institute for conservation
International Journal of Conservation Science

This paper presents the results of the IR thermographic diagnostics of the seismic damage inflicted upon the ẑ;iĉa Monastery after the earthquake on 3rd November 2010. The ẑiĉa Monastery founded in 13th century is located in central Serbia. The moisture content in the structure was detected too. The obtained results document the current state of the buildings and, at the same time, confirm the advantages of IR thermography as a method in the diagnosis of earthquake cracks, useful for the seismic retrofit study. The obtained results enable the identification of the structure parts where more in-depth investigations need to be concentrated. The procedures and activities for curative conservation and protection of the ẑiĉa Monastery should include the thermographic test results. The results and the conclusions obtained in this case study could be used as example for further extensive studies of historical and cultural heritage buildings. Source

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