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Studying the behavior of concrete at high temperatures
Čonka, Ladislav ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
The thesis is focused on the current issues of concrete resistance to high temperatures. The theoretical part has been processed the changes taking place in the individual components of concrete and changes affecting the physical - mechanical properties of concrete and color-changing effects manifesting high. In the experimental part of the load was, carried concrete test samples to a temperature of 400 ° C, 600 ° C and 800 ° C. After the thermal load, has been on test samples tested changes in physico - mechanical properties, especially concrete compressive strength, water absorption but also a visual assessment of the concrete surface
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Search for harmony in artistic expression
BOUDOVÁ, Julie
The aim of this paper is cognition of eastern art feng-shui, selecting specific part and its subsequent putting into practise at Elementary Art School. It deals with "Theory of the five elements", which includes fire, earth, metal, water and wood. The theoretical part describes the theory of feng-shui and short history of eastern art, foundations of art education and different kinds of art creation, mainly spatial and action creation. The practise part is a note of teaching at Elementary Art School and presentation this topic into the school practise.
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Smoke and Fire Detection in Video Sequences
Tomek, Peter ; Štancl, Vít (referee) ; Švub, Miroslav (advisor)
This thesis aims to analyse a videosignal given in input and find segments that contains fire or smoke. The problem is divided into two cases-detection of fire and detection of smoke. The first and main step of analysation is detection of segments by Gaussian mixture model that is trained by Expectation-Maximization algorithm, or shortly EM algorithm. For smoke detection is than used method of optical flow. The final segments are than processed by some morphological methods and determination of their position is made. Finally, the output of algorithm is again a videosignal in which segments that probably contains fire or smoke are highlighted.
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The Effect on Cause of Fire by Weather Conditions
PETRÁK, Martin
The aim of this work is to assess the possible effects of meteorological conditions on the causes of fires (The Effect of Weather Conditions on Causes of Fire). At present great emphasis is put on the investigation of the causes of fire while detecting human or technical failure or the combination of the two. Meteorological influences are given less importance but in many cases they are the cause of technical failures, although often indirect. Under normal operating conditions, the burning process occurs when three basic conditions meet: there are flammable substances, oxidation and initiatory temperature. The direct cause means the impact of the initial temperature and the indirect cause means affecting the flammable substance or material itself and oxidation. As for the direct effects of meteorological conditions, only fires caused by lightning strikes are evaluated as the direct cause of fires in the statistics of Fire Rescue Service of the Czech Republic. Based on technical literature and findings of fire examiners from Fire Rescue Service of South Bohemia, we can easily conclude that fires can easily be started by direct sunlight and relatively simple optical elements. Indirect impact of weather conditions means a wide range of specific conditions which may affect flammable substances or oxidizing agents. On one hand there are specific conditions that affect technical and technological ageing and depreciation, such as extreme temperatures, both in summer and winter, rainfall, wind, and so on. On the other hand, weather conditions also affect activities and behaviour of people during the year. The research was based on monitoring the direct and indirect influence of weather conditions on the occurrence of fires in South Bohemia between the years 2009 and 2013. The findings were used to identify possible fire prevention strategies and to make it easier to identify certain weather conditions which may lead to a fire.The facts used in this thesis are based on technical literature monitoring the issue of fire protection, specialized literature from meteorology and climatology of the Czech Republic, Fire Rescue Service statistics and output from real-life fires which mainly occurred on the territory of the South Bohemia region.
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