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Effect of operating conditions on tram noise in real traffic
Lounek, Kryštof ; Galas, Radovan (referee) ; Valena, Martin (advisor)
The bachelor's thesis investigates the influence of weather conditions on the squeal noise produced by the contact of the wheel with the top of the rail. Weather conditions are defined here as humidity, air temperature and the presence of rain. The thesis also compares specific trams in terms of their propensity to produce squeal noise and the parameters of the noise produced. The data sets used in the analysis come from a one-month period from a stationary module located near the track curve in the Brno-Komín tram loop. The graphical dependencies, which are the result of the work, describe a decreasing tendency of the average noise level depending on the humidity and an increasing tendency of the average noise level depending on the temperature. They also show a significant reduction in the occurrence of squeal noise during rain. As far as the tram comparisons are concerned, tram no. 1713 produces the most squeal noise, in fact in 86% of the cases. It also has one of the highest values of all noise parameters. The results of this work can help to explain the variable behaviour of squeal noise and can also be used to identify specific noisy trams.
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The role of atmospheric precipitation in anther dehiscence
Kampová, Anna ; Vosolsobě, Stanislav (advisor) ; Valuchová, Soňa (referee)
Anther dehiscence is an important process taking place at the end of the plant life cycle. This process consists of various follow-up steps which result in anther opening and pollen grains exposure. Good timing of the anther dehiscence must be synchronized with pollen grains maturation and flower opening. Atmospheric precipitation is a high-risk factor for the anther dehiscence. Male fitness of plants can be reduced when anthers open during poor weather conditions. The aim of this study was to investigate the effect of atmospheric precipitation, rain and dew, on Arabidopsis arenosa anther dehiscence. We observed that rain and dew led to a postponed final stage of the anther dehiscence. This caused delayed pollen release. The effect of aqueous and nonaqueous environment on the anther dehiscence was also tested. Experiments with transformation of A. arenosa using Agrobacterium tumefaciens were performed. Key words: anther dehiscence, flower opening, rain, dew, Arabidopsis arenosa, Agrobacterium tumefaciens, transformation
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What is the water contribution of fog to atmospheric deposition? Use of stable isotopes.
Hanusková, Darina ; Hůnová, Iva (advisor) ; Šantrůček, Jiří (referee)
The objective of the Master thesis is to estimate the fog contribution on atmospheric deposition with the usage of stable isotopes. The crucial part of the thesis was to perform (first of its kind in the Czech Republic) the relative isotope composition 18 O a 2 H of fog. In the same time, the composition of rain and throughfall was performed. The collection of each type of precipitation took place in five sampling points of Academy of Science within three mountain regions including Krkonoše, Šumava and Jizerské Hory during October and November 2017. The sampling took 14 days in total and it was performed by using TC/EA ThermoBremen and mass spectrometer Delta ThermoBremen at South Bohemian University in České Budějovice. The results confirmed that fog is isotopically heavier in comparison to regular rain. As for the relative isotope composition 18 O and 2 H of each areas, no significant difference was observed. Results of the fog participation on atmospheric deposition in Krkonoše and Šumava can be seen after drafting a simple linear mixing model. The fog contribution on atmospheric deposition in Šumava for 18 O is 4,7 % and for 2 H is 6,4 18 O. For one area in Krkonoše, the average participation for 18 O is 3,6 %. Key words: stable isotopes, oxygen, hydrogen, fog
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The role of atmospheric precipitation in anther dehiscence
Kampová, Anna ; Vosolsobě, Stanislav (advisor) ; Valuchová, Soňa (referee)
Anther dehiscence is an important process taking place at the end of the plant life cycle. This process consists of various follow-up steps which result in anther opening and pollen grains exposure. Good timing of the anther dehiscence must be synchronized with pollen grains maturation and flower opening. Atmospheric precipitation is a high-risk factor for the anther dehiscence. Male fitness of plants can be reduced when anthers open during poor weather conditions. The aim of this study was to investigate the effect of atmospheric precipitation, rain and dew, on Arabidopsis arenosa anther dehiscence. We observed that rain and dew led to a postponed final stage of the anther dehiscence. This caused delayed pollen release. The effect of aqueous and nonaqueous environment on the anther dehiscence was also tested. Experiments with transformation of A. arenosa using Agrobacterium tumefaciens were performed. Key words: anther dehiscence, flower opening, rain, dew, Arabidopsis arenosa, Agrobacterium tumefaciens, transformation
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Realistic Model of the Sky
Kussior, Zdeněk ; Bílek, Václav (referee) ; Drahanský, Martin (advisor)
The paper describes a theoretical base and realization of realistic volumetric clouds visualization in an environment of real-time simulator. The first part is concerned with a meteorological background of this problem. I show international classification of ten basic cloud types including a short description and cases of occurence. The following part is concerned with an interaction between cloudiness and simulation core, which is based on the fact, that each cloud acts as a mechanical or an electromagnetic obstacle. This should be considered on some way in simulation. The next part describes technologies and practical implementations of visualization and evaluates their characteristics. Finally, the last chapter describes my implementation and tries to outline project advancement.
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What is the water contribution of fog to atmospheric deposition? Use of stable isotopes.
Hanusková, Darina ; Hůnová, Iva (advisor) ; Šantrůček, Jiří (referee)
The objective of the Master thesis is to estimate the fog contribution on atmospheric deposition with the usage of stable isotopes. The crucial part of the thesis was to perform (first of its kind in the Czech Republic) the relative isotope composition 18 O a 2 H of fog. In the same time, the composition of rain and throughfall was performed. The collection of each type of precipitation took place in five sampling points of Academy of Science within three mountain regions including Krkonoše, Šumava and Jizerské Hory during October and November 2017. The sampling took 14 days in total and it was performed by using TC/EA ThermoBremen and mass spectrometer Delta ThermoBremen at South Bohemian University in České Budějovice. The results confirmed that fog is isotopically heavier in comparison to regular rain. As for the relative isotope composition 18 O and 2 H of each areas, no significant difference was observed. Results of the fog participation on atmospheric deposition in Krkonoše and Šumava can be seen after drafting a simple linear mixing model. The fog contribution on atmospheric deposition in Šumava for 18 O is 4,7 % and for 2 H is 6,4 18 O. For one area in Krkonoše, the average participation for 18 O is 3,6 %. Key words: stable isotopes, oxygen, hydrogen, fog
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Atmospheric Efects in WebGL
Brydl, Jaroslav ; Lysek, Tomáš (referee) ; Starka, Tomáš (advisor)
This thesis deals with the simulation and rendering of atmospheric effects in WebGL using Three.js application interface. The principles of functioning and implementation of the effects of altering day and night, clouds, snow, rain and shadows are described. Effects are mostly implemented with GLSL shaders that allow easy use across different platforms.
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Droplet size evolution during rain event
Kim, Yong Min ; Hovorka, Jan (advisor) ; Braniš, Martin (referee)
This work will focus on measuring the rain drop size distribution during several episodes of precipitation. From the data matrix a simplified graph - color contour maps were drawn. The dynamics of the size of rain drops during a rain will be linked to the type of precipitation and global movement of air masses from withholding episode.
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Measurement of the rain rate instantaneous value using acoustic method
Kresta, Daniel ; Poliak, Juraj (referee) ; Wilfert, Otakar (advisor)
This thesis deals with implementation of the rainfall rate measurement using an acoustic method. It is divided into four parts. In the first part of the thesis a necessary theoretical knowledge is analysed. The second part contains a design of a workplace used for the measurement. The third part presents and analyses important experimental recordings acquired in the workplace. Then all measured values are processed and applied in the measuring program. The last part summarizes results of the thesis, advantages and disadvantages of using the acoustic rainfall rate meter.
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Rain Prediction Using Meteo-Radar
Gerych, Petr ; Hradiš, Michal (referee) ; Szőke, Igor (advisor)
This paper deal with the rain prediction in the short time interval. The static pictures from meteo-radar serves as input data. The principle of meteo-radar is explained. The possible methods of the object detection and registration, motion interpolation and extrapolation is described. The flood fill algorithm and Lagrange extrapolation is applied to rain prediction. Application is written in C++ language under OS Linux. The example of the software application results is included.
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