National Repository of Grey Literature 10 records found  Search took 0.01 seconds. 
Report on the structural survey of Judith's Tower in Prague 1. Part II
Drdácký, Miloš ; Kloiber, Michal ; Frankl, Jiří ; Zíma, Pavel ; Wolf, Benjamin
For the intended restoration of the object, a survey of structures that show faults or for which knowledge of material characteristics is needed for calculations confirming the reliability of the structures was requested. During the implementation of the order, there were difficulties that affected the necessity of its execution in two stages. The user of the tower cooperated with the authors of this report without any problems, and therefore it was possible to carry out the work listed below in the necessary scope and quality.
Innovative device for the simulation of environmental conditions and testing of building materials
Cacciotti, Riccardo ; Wolf, Benjamin ; Macháček, Michael ; Frankl, Jiří
Excessive humidity influences the performance of building envelopes and the safety of their occupants. Moisture related problems can indeed impose significant health risks for buildings’ users and even lead, under extreme scenarios, to structural failures. This paper investigates an innovative experimental setup for evaluating the influence of changing environmental conditions on the performance of building materials. It stems out from a broader ongoing research aimed at studying the trends of mould growth on wooden building components. The presented results include the design, construction and numerical validation of a small-scale climatic wind tunnel (2m x 1.8m ca.) to be used for the simulation of natural ventilation and daily humidity and temperature fluctuations. Key findings include the final design of a low cost, modular construction which allows gathering reliable data on the response of building materials exposed to changing boundary conditions, intended for improving current mould growth models. Future work is also suggested.
Methodology of the measuring of projectile velocity degradation in the ballistic resistant materials
Šperl, Martin ; Bejdl, Jan ; Wolf, Benjamin ; Koutný, O. ; Kratochvíl, J. ; Bystrianska, E. ; Křesťan, J. ; Bartošková, M. ; Holešinský, R. ; Drdlová, M. ; Šoukal, F. ; Pěchouček, P.
The methodology report describe a complete methodology for measuring the decrease of projectile speed in ballistic resistant material, incl. description of the required measuring systems.
Methods No. 25/01/UTAM19 for covering of the buried infrastructure components against laid explosives and cumulative bullets
Šperl, Martin ; Gajdoš, Lubomír ; Wolf, Benjamin
The methodology describes specific procedures for covering of the buried infrastructure components. The purpose of these procedures is low cost protection for the buried technologies against dynamic ground threats. Mainly it is laid explosives and cumulative bullets. The basic procedures of this methodology have been implicated into the gas normative regulation TPG 70204 - Revision 2.
Methodology for measurement of fast projectiles speed decrement during their penetration through various substances using a digital opto-mechanical device
Šperl, Martin ; Gajdoš, Lubomír ; Wolf, Benjamin
This methodology describes the procedures, the equipment and software used for measurement of the speed decrease of flying projectile through different bulk, silicate and solid masses. The advantage and uniqueness of this methodology consists in ability to measure the attenuation characteristics of various materials during the impact by high speed projectile. The methodology is based on a system of thin plates with optic fibers that function as a light-time gate with a defined pitch.
Crystallization force of sodium chloride
Koudelková, Veronika ; Wolf, Benjamin
Soluble salts are one of the most deteriorating factor causing damage of historical building materials due to generation of crystallization pressure inside pore space. Direct measurement of crystallization force is quite challenging, hence we developed at our institute a novel device able to detect the force of growing crystal. The device is based on the monitoring of force developed with upper microscopic glass on the growing crystal to maintain constant position. The crystal could generate force because of the existence of thin liquid layer of solution between both surfaces come into contact. The driving force for the subsequent growth of crystal against obstacle is supersaturation, which is mainly induced by evaporation of the salt solution. In this experiment, the crystal of sodium chloride generated force 16.8 mN and the corresponding crystallization pressure was equal to the value 0.48 MPa.
Material characterization of historical roofing slate tiles and assessment of the state regarding the planned building reconstruction.
Drdácký, Miloš ; Slížková, Zuzana ; Frankeová, Dita ; Hasníková, Hana ; Hauková, Petra ; Koudelková, Veronika ; Kozlovcev, Petr ; Valach, Jaroslav ; Wolf, Benjamin
The report includes the results of the study focusing on the material properties of historical roofing slate tiles and assessment of the state regarding the planned building reconstruction.
Material analyses of plaster samples of the historical building named “Nové Probošství”, Pražský hrad, nám. sv. Jiří č.p. 34.
Drdácký, Miloš ; Slížková, Zuzana ; Frankeová, Dita ; Hasníková, Hana ; Hauková, Petra ; Koudelková, Veronika ; Kozlovcev, Petr ; Ševčík, Radek ; Wolf, Benjamin
The report contains the results of the material analyses of plasters and stone samples taken from the facades and interior plasters of the historical building named “Nové Probošství” (Pražský hrad, nám. sv. Jiří č.p. 34).). The topic of the study was determination of the chemical composition and the microstructure of historical plasters and renders, sandstone petrography, porosity of materials by means of MIP, water absorption of plasters by tubes, the water content and the moisture distribution in masonry wall, the content and the chemical composition of water-soluble salts in plasters and renders. The results of the study serves as the basis for the future design of the building renovation and the restoration of the artistic elements.\n
Chemical and mineralogical analyses of stone sampled from Troja Castle, baroque staircase, Prague 7
Slížková, Zuzana ; Mácová, Petra ; Viani, Alberto ; Šašek, Petr ; Wolf, Benjamin
Chemical and mineralogical analyses of stone sampled from Troja Castle, baroque staircase, Prague 7.
Assessment of vibrations in museum's environment
Valach, Jaroslav ; Wolf, Benjamin ; Paulová, E. ; Urushadze, Shota
This paper deals with measurement of mechanical vibrations and accelerations threatening objects in museum collections. Two case studies are presented. The first case analyses situation in museum exhibitions strongly influenced by street traffic in its close proximity. It compares results obtained by sensitive professional measurement system to the custom-built user device for acceleration recording. The second case analyzes object’s accelerations during transport based on measurement by the custom-built device.

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