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Investigation of Optical Properties of Protective Layer for Glass Medieval Mosaic of Last Judgement from St. Vitus Cathedral in Prague
Valach, Jaroslav ; Kocour, Vladimír ; Černý, Miloš
The Mosaic of Last Judgement from St. Vitus Cathedral in Prague is a medieval masterpiece created in late 14th century by Venetian craftsmen. If very dramatic history and various problems encountered are taken into consideration, the current state of preservation is acceptable, perhaps mainly due to systematic effort to protect the valuable item of cultural heritage. The research project, part of which is presented here, also aims on developing effective means for preservation of the precious object. It concentrates on finding formula for creation of protective layer that eliminates influence of chemicals present in air and in water, while being stable itself. The main goal of the investigation is to help in finding the best formula for protective layer that is most stable itself, i.e. which does not represent a future obstacle in viewing the mosaic, e.g. because of losing its transparency.
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Experiment E6/0,2 Lateral Passive Pressure – Rotation about the top
Koudelka, Petr ; Valach, Jaroslav ; Bryscejn, Jan
The paper gives information on a repeated long-term experiment E6/0,2 with lateral pressure at rest and passive pressure during wall rotation about the top towards into tested granular mass. The experiment was successfully finished in the last year 2011 and (together with a previous experiment E5/0,2) it should prove gained results which appear distinct from a theory of EUROCODE 7-1 contemporaneously used. Both experiments monitored and registered both pressure components and mass deformation and displacements into the sandy mas.
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Investigation of composite material degradation indicators using acoustic measurement: comparison with laser vibrometry
Fíla, Tomáš ; Urushadze, Shota ; Kytýř, Daniel ; Valach, Jaroslav ; Šperl, Martin
This paper deals with investigation of acoustic material degradation indicator (attenuation decrement drop of selected natural frequency) measured by a custom-built experimental device. Samples of C/PPS fibre composite material were analyzed. Acoustic signals were recorded and processed using spectral analysis and sound signal regression. Data measured by this method were verified by comparative experiment. Specimens were simultaneously measured using both acoustic experimental device and laser vibrometer. Modal analysis of the specimen were carried out prior to the experiment. This enabled assessment of specimens natural modes and therefore the best impact zone. In total, 10 measurements were performed for each specimen at the same level of degradation. Measured data were then processed and compared. The specimens were repetitively measured after designated number of loading cycles.
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Analysis of wood behaviour in the surroundings of a pin being pushed for the diagnostics of constructional elements of buildings
Kloiber, Michal ; Tippner, J. ; Hrivnák, J. ; Vichrová, Gábina ; Valach, Jaroslav
The technical solution of this diagnostic device for in-situ and laboratory measuring of conventional strength and the module of deformation by opening clamps in a drilled hole belongs to the field of quality and material property testing, especially concerning timber. In dependence on the specific technical solution, the device can be used for an establishment of conventional strength and the module of deformation of any material by opening clamps in a drilled hole in the examined volume. It also finds application in the situations when resistance drilling cannot be used and the mechanical properties of timber need to be established through the entire section of the examined element. Its main advantages are its speed and simple operation without a need for power distribution network.
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MONDIS: Knowledge-Based System of Failure of Historical Constructions
Valach, Jaroslav ; Cacciotti, Riccardo ; Čerňanský, Martin ; Kuneš, Petr
The main aim of introducing and developing a knowledge-based system of failure of historical constructions called MONDIS is to overcome a lack of data on defects of monuments. MONDIS proposes a methodology capable of reproducing the logical relationship between the manifestation of damage, its diagnosis and the possible interventions. Based on novel information sciences tools, like semantic technologies, the system will be able to assist users in finding similar failures cases, in analyzing the causes of damage and also suggesting suitable restoration techniques accordingly to conservation principles of intervention.
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