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Determination of droplet velocity and size from high-speed imaging
Juroška, Jan ; Cejpek, Ondřej (referee) ; Malý, Milan (advisor)
In this bachelor thesis there was created a method of getting velocity and size of droplets form a video using computer vision. Velocity is obtained via PIVlab toolbox in matlab, wich uses Particle Image Velocimetry. Size is obtained via matlab code. Theoretical basis on wich this code was written is included in the theoretical part of this thesis. In practical part of this thesis, accuracy of this method was evaluated and the method was applied on a video of a real spray droplet flow.
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Dynamics of cavitating flow behind the orifice
Kubina, Dávid ; Kozák, Jiří (referee) ; Rudolf, Pavel (advisor)
Cavitating flow through five perforated plates with different number of holes with preserved constant flow cross-section area in sum were experimentally examined. Dynamic characteristics such as dependence of pressure amplitudes and dominant frequencies on cavitation number in all regimes of cavitating flow: incipient cavitation, partial cavitation, fully developed cavitation and supercavitation are obtained. For determination of dominant frequencies several pressure transducers in two regimes of measurement were used. Results were validated with frequency spectra obtained from picture analysis based on high-speed camera records.
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Analysis of structural changes of nanofiber scaffolds in relation with their relative extension
Morávek, Martin ; Lopot, František (advisor) ; Hadraba, Daniel (referee)
The goal of this thesis was to find a suitable method for evaluating structural changes of scaffolds as influenced by external mechanical pressure and to verify the validity of hypothesis which assumes a change of directionality of fibers and also thinning of fibers according to the stretching of a scaffold. Assumptions formulated in these three hypothesis were tested on a scaffold with a plasma surface treatment and without any plasma surface treatment. To examine structural changes an electrone microscope was used to observe the surface of scaffolds. Incurred photos were then processed with the help of automatic software picture analysis and observed data were statisticly evaluated. The result of this experiment is a description of used method which can be used in future for larger studies. It was found that by the effect of external mechanical pressure fibers of examinated scaffolds turn in the direction of the pull. It has also been found that the average thickness of fibers didn't change. Results of this work give insight into the evaluation of structural changes of scaffolds when pressured by an external mechanical power and open possibilities for deeper and more exact research in this field. Key words: scaffold, picture analysis, fiber directionality, fiber thickness.
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Determination of droplet velocity and size from high-speed imaging
Juroška, Jan ; Cejpek, Ondřej (referee) ; Malý, Milan (advisor)
In this bachelor thesis there was created a method of getting velocity and size of droplets form a video using computer vision. Velocity is obtained via PIVlab toolbox in matlab, wich uses Particle Image Velocimetry. Size is obtained via matlab code. Theoretical basis on wich this code was written is included in the theoretical part of this thesis. In practical part of this thesis, accuracy of this method was evaluated and the method was applied on a video of a real spray droplet flow.
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The tranformation of the visual style of Czech televison form 1992 to the presence
Šmejcká, Tereza ; Slanec, Jaroslav (advisor) ; Géla, František (referee)
This diploma thesis investigates the transformation of the visual style of chosen news and journalistic programmes, chosen news programmes are Události (main news programme), Branky, body, vteřiny (sports news) and Předpověď počasí (weather forecast), chosen journalistic programmes are 168 hodin, Reportéři ČT, Objektiv and Toulavá kamera. In its theoretical part the thesis is focused on history of Czechoslovakian and Czech television. Furthermore there is a description of visual communication and visual style with detailed focus on typography and colourfulness. Next the theoretical part focuses on the characteristics of logo and its important attributes. Another chapter depicts a visual style of a television channel in the sight of selfpromotion, on air and off air applications and the graphics of a television, its current trends, effects, typography and current approaches. The last chapter of the theoretical part focuses on description of chosen programmes. In the frame of empirical part the picture analysis appended with semiotic analysis of chosen programmes and logo of Czech television were conducted. The picture analysis consists of five technical and two symbolical codes, the values of the codes are written down in tables. The transformation of each programme in tracked period is written...
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Dynamics of cavitating flow behind the orifice
Kubina, Dávid ; Kozák, Jiří (referee) ; Rudolf, Pavel (advisor)
Cavitating flow through five perforated plates with different number of holes with preserved constant flow cross-section area in sum were experimentally examined. Dynamic characteristics such as dependence of pressure amplitudes and dominant frequencies on cavitation number in all regimes of cavitating flow: incipient cavitation, partial cavitation, fully developed cavitation and supercavitation are obtained. For determination of dominant frequencies several pressure transducers in two regimes of measurement were used. Results were validated with frequency spectra obtained from picture analysis based on high-speed camera records.
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The depiction of events in Ukraine on photographs - ethical aspects of depicting conflict
Šírová, Natálie ; Lábová, Alena (advisor) ; Štefaniková, Sandra (referee)
The Master Thesis The depiction of events in Ukraine on photographs - ethical aspects of depicting conflict presents a case study focused on depiction of Ukrainian crisis in photographs during a defined period of time of 2014 in five Czech and five foreign newspapers. The first part of the thesis introduces the theoretical concepts that are the basis for the analysis. The analytical part presents the research of depiction of the Ukrainian events in news photographs in the daily newspapers using the technique of content picture analysis. The results let us compare the differences between the approach of the individual Czech and foreign newspapers to the issue of publishing graphic images of violence and its victims. Based on these findings, the thesis tries to define the contemporary trends regarding the ethical issues of photojournalism. Powered by TCPDF (www.tcpdf.org)
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Analysis of structural changes of nanofiber scaffolds in relation with their relative extension
Morávek, Martin ; Lopot, František (advisor) ; Hadraba, Daniel (referee)
The goal of this thesis was to find a suitable method for evaluating structural changes of scaffolds as influenced by external mechanical pressure and to verify the validity of hypothesis which assumes a change of directionality of fibers and also thinning of fibers according to the stretching of a scaffold. Assumptions formulated in these three hypothesis were tested on a scaffold with a plasma surface treatment and without any plasma surface treatment. To examine structural changes an electrone microscope was used to observe the surface of scaffolds. Incurred photos were then processed with the help of automatic software picture analysis and observed data were statisticly evaluated. The result of this experiment is a description of used method which can be used in future for larger studies. It was found that by the effect of external mechanical pressure fibers of examinated scaffolds turn in the direction of the pull. It has also been found that the average thickness of fibers didn't change. Results of this work give insight into the evaluation of structural changes of scaffolds when pressured by an external mechanical power and open possibilities for deeper and more exact research in this field. Key words: scaffold, picture analysis, fiber directionality, fiber thickness.
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