National Repository of Grey Literature 37 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Determination of the vaporization plane depth in sandstones and other porous materials: uranine-coated needles
Mareš, Jakub ; Weiss, Tomáš (advisor) ; Válek, Jan (referee)
Abstact The vaporization plane in porous materials separates the capillary zone, the area where water moves in liquid state, from the dry surface layer where water moves in the form of vapor. The depth of the vaporization plane and its geometry is essential for a large number of physical, chemical and biological processes in porous materials that can, for example, cause material degradation and decay. Mostly, the vaporization plane is not measured directly, but water content or suction pressure measurements are used instead, which are, however, not suitable for the plane's detection. Therefore, there was a need for a method that would be able to determine the depth of the vaporization plane in holes of small diameter (<1 cm). To fulfill this aim, I used a needle onto which I applied glue and uranine. Upon insertion, uranine on the needle dissolves in the capillary zone and changes its color from red to green, while remaining red in the dry zone. The boundary between the red and green parts thus accurately displays the vaporization plane. With this newly developed method, I subsequently measured the depth of the vaporization plane on natural outcrops as well as on buildings, where I tried to describe the vaporization plane's behavior.
Non-destructive survey of the oldest part of the castle in Telč
Drdácký, Miloš ; Eisler, Marek ; Lesák, Jaroslav ; Válek, Jan ; Skružná, Olga
Recent archaeological findings discovered at an excavation in the southeastern section of the small courtyard of the old palace at the state castle in Telč sparked interest in further exploring hidden structures below ground and within the existing masonry. Therefore, a non-destructive survey of structures hidden beneath the current level of the courtyard using ground-penetrating radar was conducted, as was a survey of the masonry within the old walls of the palace using thermography.
Reconstruction of the Renaissance sand-coloured sgraffito based on the material copy
Válek, Jan ; Skružná, Olga ; Kozlovcev, Petr ; Waisserová, J. ; Wichterlová, Z. ; Jiroušek, Josef
The aim of the method is to provide a methodical design for the preparation of sand made sgraffito mortar and show its use on a specific example.
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Survey of the facial sandstone masonry of the stone coat of historic structures with the use of non-invasive analytical techniques of ground-penetrating radar
Havlín, J. ; Slavíková, M. ; Gláser, Petr ; Válek, Jan ; Pavelka, K. ; Panošová Hucková, M.
This conservation procedure includes a description of basic steps, which must be followed to use the ground-penetrating radar and to gain useful data for composition visualization of facial sandstone masonry used in historic structures. Suitable settings of the GPR device are introduced for collecting data and the way of their processing with the aid of software. The conservation procedure applies a non-invasive analytical technique of GPR when surveying stone structures and therefore it can be a useful specifying tool of particular details during the execution phase of the construction-historical survey
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Methodology of the use of non-invasive surveying methods - ground-penetrating radar, impact-echo method and ultrasonic transmission measurement of the surface to assess the condition and construction details of the sandstone coat of buildings
Havlín, J. ; Slavíková, M. ; Válek, Jan ; Pavelka, K.
The methodology describes principles of selected methods (ground-penetrating radar, impact-echo method, ultrasound), their potentials, limitations and advantages when combined during the survey of stone coats of structures. Further on, the methodology indicates the process of the measurement itself and evaluation of the collected data.
Surveying of voids in masonry of tympanum of front façade of Národní Museum
Válek, Jan ; Skružná, Olga ; Frankl, Jiří
Ground Penetrating Radar (GPR) was used for non-destructive surveying of indoor brick masonry. After data evaluation size and positions of internal masonry voids were determined.\n\n
Assessment of masonry structures in the room No. 303 on the first floor of Upper Castle of Kunštát State Castle
Drdácký, Miloš ; Frankeová, Dita ; Kloiber, Michal ; Koudelková, Veronika ; Lesák, Jaroslav ; Válek, Jan ; Viani, Alberto
Non-destructive evaluation techniques have been adopted to assess the present situation of the walls with recently discovered frescoes in the rebuilt part of the castle. IR thermography, videoscope and ground penetrating radar were used for the classification of masonry, especially for the detection of hidden structural elements. Samples of historic mortars were analysed by thermal analysis and scanning electron microscopy. The analyses showed that binder of mortars consists of dolomitic lime.
Analysis of new renders and masonry damaged by moisture and water-soluble salts
Válek, Jan ; Skružná, Olga ; Ševčík, Radek ; Frankeová, Dita ; Nunes, Cristiana Lara
Research report about the state of new renders of the building Obecní Dvůr, Prague 1. Very high concentration of nitrates in masonry was identified as the reason of their bad state.
Optimization of Processes of Customer Relationship Management
Kovář, Martin ; Válek, Jan (referee) ; Videcká, Zdeňka (advisor)
Main purpose of this bachelor thesis is to analyze a workflow and suggest optimization of processes in order to provide improvement of customer oriented services by implementing of changes to satisfy both customers and internal users needs. Modernization of current information system is one of the crucial steps taken to support this solution.
Traditional lime technologies of historical buildings and their use at present. Final report
Válek, Jan
The project was based on a design and construction of a lime kiln. The kiln was tested and described and it enabled to study the effects of traditional lime production on quality of lime. This also allowed to produce lime binders, which were commonly used in the past and were later on abandoned. Research and experimental works focused on quality of lime putties and determining the suitability of different types of previously used materials for production of lime binders. Detailed research of available resources related to the lime production was carried out. The important aim was creation of applied outputs that would be useful in practical care of historical buildings.

National Repository of Grey Literature : 37 records found   1 - 10nextend  jump to record:
See also: similar author names
21 VÁLEK, Jan
3 Válek, Jakub
1 Válek, Jaroslav
6 Válek, Jiří
1 Válek, Josef
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