National Repository of Grey Literature 58 records found  previous11 - 20nextend  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.
Characterization of mortars and plasters of pre-Romanesque architecture of Great Moravia
Válek, Jan ; Skružná, Olga ; Kozlovcev, Petr ; Frankeová, Dita ; Viani, Alberto
The document contains archaeological samples from excavation in the building of the Palace in Mikulčice. The results include the characterization of used raw materials, their input ratio and a their description in order to specify their provenance.
GPR survey of the reinforcement above the long horizontal window case study: Ice ring stadium restaurant Fuchs on Štvanice Island
Válek, Jan ; Kozlovcev, Petr ; Eisler, Marek ; Dušek, Ondřej
The aim of the survey was to assess the use of Ground Penetration Radar for the reinforcement position detection on the Ice ring restaurant – an early concrete building on Štvanice Island in Prague from 1932. For this case study a potentially critical section of a façade above the app. 16 m long horizontal window was selected. GPR from IDS company equipped with 2 GHz high frequency antenna was used.
Survey of the ceiling structure of the library in the Jesuits dormitory in Telč
Válek, Jan ; Skružná, Olga
The aim of the non-destructive survey was to reach better description of the ceiling structure before the planned reconstruction of the library.
Survey of the constructions hidden under the floor of the castle chapel of All Saints in Telč
Válek, Jan ; Skružná, Olga
The aim of the non-destructive survey was to determine the presence of building construction hidden under the contemporary floor. The survey confirmed the position of underground crypt and revealed no other structures.
Design of material and technological copy for repair of sgraffito decorated renders
Válek, Jan ; Skružná, Olga ; Wichterlová, Z. ; Waisserová, J.
This paper deals with research in Renaissance sgraffito materials and techniques. It focuses on the replication process for original materials and application techniques used in a reconstruction of the missing parts of a sgraffito decoration depicting a Landsknecht procession on the façade of a house in Slavonice. The result of the theoretical and practical experimental work is the description and evaluation of the process of creating a material and technological copy of the original. This involved detailed material analysis, determining the provenance of and selecting suitable raw materials, design of a repair mix and its testing, and evaluation during application trials. The study has shown that, in order to achieve good results, the conclusions of material analysis have to be linked to the practical\nskills of restorers and conservators. The particular application procedures that match the requirements of the historical material and the original work can be deduced from full scale practical trials. Feedback between the design of the repair mixture and the application process made it possible to come to an optimal material and application technique. The missing parts of the sgraffito were replaced using a mortar and application technique that closely correspond to those originally used in the Renaissance.
Survey of the constructions hidden under the floor of the Church of St. Jakub in Telč
Válek, Jan ; Skružná, Olga
The aim of the non-destructive survey was to determine the presence of building construction hidden under the contemporary floor, in particular assumed underground crypt.
Survey of the constructions hidden under the floor of the Church of the Assumption of the Virgin Mary in Jindřichův Hradec
Válek, Jan ; Skružná, Olga ; Kozlovcev, Petr
The aim of the non-destructive survey was to determine the presence of building constructures hidden under the contemporary floor. The measurement was performed in the chancel area where a tomb was assumed.
The supplement of early Baroque stucco decoration based on material and technological copy
Válek, Jan ; Skružná, Olga ; Kozlovcev, Petr ; Waisserová, J. ; Wichterlová, Z. ; Frankeová, Dita ; Kotková, Kristýna
The aim of the article is to provide a methodical design for the preparation of Baroque stucco and show its use on a specific example.
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Survey of mortars of the Romanesque chapel in the tower of Landštejn Castle
Válek, Jan ; Skružná, Olga ; Kozlovcev, Petr ; Frankeová, Dita ; Svoboda, Milan ; Ševčík, Radek ; Kotková, Kristýna
Four samples of floor mortars and two samples of plasters were analysed as a part of the survey in the Romanesque chapel located in the tower at Landštejn Castle. The aim was to characterize used raw materials, determine their ratio, characterize the porosity of mortars and compare mortars sorted to different phases of construction.

National Repository of Grey Literature : 58 records found   previous11 - 20nextend  jump to record:
See also: similar author names
40 VÁLEK, Jan
3 Válek, Jakub
1 Válek, Jaroslav
7 Válek, Jiří
3 Válek, Josef
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