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	Mechanical characteristic of timber damaged by chemical anti-fire agents Kloiber, Michal ; Frankl, Jiří ; Drdácký, Miloš ; Tippner, J. ; Kučerová, I. ; Bryscejn, Jan The article presents the results of a research focused on determination of effect of chemical degradation of wooden construction elements on their mechanical characteristics. The damage of wood was caused by chemical reactions of basic substances of wood mass with compounds contained in anti-fire coatings. This kind of corrosion is called surface defibering of wood. Detailed record
	Použití intenzity světla pro měření hloubky Valach, Jaroslav ; Bryscejn, Jan ; Vavřík, Daniel An uncommon optical method for depth measurement is presented. An interesting feature of this method is independence of its results accuracy on distance of the measured object to measuring device. Detailed record
	Selected non destructive methods for investigation of a hidden wood decay extent Drdácký, Miloš ; Kloiber, Michal ; Kotlínová, M. ; Valach, Jaroslav ; Frankl, Jiří ; Bryscejn, Jan The paper deals with a practical application of selected nondestructive testing methods at survey of decayed roof framework members. Three methods were used: X-ray, ultrasound testing and resistance microdrilling. Detailed record
	Pokročilé optické metody pro analýzu historických objektů Bryscejn, Jan ; Drdácký, Miloš ; Jakůbek, J. ; Valach, Jaroslav ; Vavřík, Daniel ; Weiss, P. The paper presents a review of special optical research infrastructure developed for analysis of historical objects and materials. They include new methods for analysis of surface qualities and micro-geometry, namely the coded photometry stereo method and its applications. Further, X-ray micro radiography and micro-tomography are presented and illustrated by typical applications. Detailed record
	Simultaneous radiographic observation of damaging and optical measurement of 3D surface displacement evolution in loaded specimen Vavřík, Daniel ; Bryscejn, Jan ; Jakůbek, J. ; Holý, T. ; Valach, Jaroslav ; Vykydal, Z. This work reports on the results of the experimental observation of generation and evolution of internal material damage during loading process in aluminium alloy flat specimen with stress concentrator. Material damage is investigated by means of the "X ray Dynamic Defectoscopy" technique. To understand related physical processes, the surface plastic strain field is investigated by the optical Method of Interpolated Ellipses while the out-of plane displacement field is inspected simultaneously by the optical Coded photometric stereo method. Detailed record
	Optical measurement of surface displacements in the vicinity of crack tip Valach, Jaroslav ; Vavřík, Daniel ; Bryscejn, Jan ; Jakůbek, J. Combined optical method for measurement of three displacement fields on flat specimens is described and applied for the evaluation of surface deformation of flat aluminum alloy specimen with central crack in tensile tests. The method utilizes two optical methods – Coded Photometry Stereo and the method of Interpolated Ellipses allowing the measurement to be performed simultaneously making it favourable for dynamical tests. Detailed record
	Non-destructive inspection of a historical wooden structure damaged by fire Frankl, Jiří ; Kloiber, M. ; Bryscejn, Jan In 2004, timber structures of the 15th century Castle Pernstejn were investigated by non-destructive methods that included acoustic waves, dendrochronology and resistance drilling. Detailed record
	New Experimental Setup for Study of Physical Processes Preceding Specimen Failure Vavřík, Daniel ; Bryscejn, Jan ; Holý, T. ; Jakůbek, J. ; Jakůbek, M. ; Valach, Jaroslav ; Vykydal, Z. Failure of a high ductile specimen usually precedes a decrease of the loading force under the condition of displacement control in the monotonic loading. Unfortunately, the elastic energy stored in the standard loading equipment can result in sudden failure within very short time corresponding to the loading unstability. We can prolong this time interval by reducing the elastic energy in the loading equipment. The proposed new loading frame fulfils the indicated requirement and enables extraordinary precise displacement loading control even beyond the maximal loading force. Plastic deformation on a surface is investigated by the optical Method of Interpolated Ellipses and together with damage processes inside of the specimen are simultaneously observed by the X-ray Dynamic Defectoscopy method. Detailed record
	Monitoring of environmental impact on cultural heritage monuments and diagnostics of their damages Drdácký, Miloš ; Bryscejn, Jan ; Lesák, Jaroslav ; Slížková, Zuzana ; Urushadze, Shota The report describes consequencies and mechanisms of environmental and anthropogenic action on cultural heritage. It presents nondestructive surveying and monitoring methods for historic structures. Detailed record
	CRAFT projekt HISTOCLEAN - alternativní využití programu Bryscejn, Jan ; Drdácký, Miloš ; Jakůbek, J. ; Vavřík, Daniel ; Valach, Jaroslav A method for quality inspection of laser cleaned stone surfaces of historical buildings was developed. The method is based on analysis of the reconstructed surface topography of studied surface. The surface reconstruction employs methods of shape-from-shading and photometric stereo to obtain 3D data from sequence of digital images Detailed record

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