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Hydraulic characteristics of the cavitation nozzles
Gríger, Milan ; Habán, Vladimír (referee) ; Rudolf, Pavel (advisor)
The main goal of this thesis is the examination of hydraulic characteristics for different cavity nozzles, influence of liquid rotation and visualization of cavitating flow. Thesis is divided into two parts, theoretical and practical. Theoretical part deals with the description of cavity - creation, development and its extinction. This part also contains description of vortex flow and basic vertex models. Practical part compares nozzles performance experimentally. The aim of experiment was to measure hydraulic characteristics and their comparison. Jet performance was judged using visualizations and measured data was processed in Microsoft Excel and Parametr.
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Induced siphonage of air into the flowing fluid.
Matlák, Jiří ; Opravil, Tomáš (referee) ; Svěrák, Tomáš (advisor)
The aim of this diploma thesis is to deepen the knowledge in the field of drain liquid from vessel with free surface due to the effluent jet with defined profile. Formation of complete suction vortex is taken place gradually depending on the starting conditions. In the diploma thesis basic relations in liquids considering whirl are described and the types of vortex are divided on the bases of circulation intensity. In the experimental part of diploma thesis the possibilities of liquid level prediction are searched for, where the whirl is formed depending on the size of effluent jet.
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Internet Criminality
Zelinka, Petr ; Konečný,, Zdeněk (referee) ; Soukup, Tomáš (advisor)
This diploma thesis focuses on the problem of internet crime in the Czech Republic and in the world. It describes and analyses various types of this criminality, used methods and technological equipment. In the second part of diploma thesis there are suggested possible technical and legislative precautions against internet crime.
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Internet Criminality
Kosek, Lukáš ; Paclíková, Vlasta (referee) ; Soukup, Tomáš (advisor)
First part of this bachelor thesis deals with computer criminality in Czech Republic, as well as abroad, and focuses on the copyright infringement. It describes different ways through which criminals obtain original works for further illegal usage. Second part of this work offers possible solutions in relation to the results of my survey.
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Vortical structures with cavitating core
Švaňhal, Radek ; Štigler, Jaroslav (referee) ; Rudolf, Pavel (advisor)
The master's thesis focuses on vortical structures with cavitating core, which might develop in Francis turbines at non-optimal discharges in a form of unstable vortex cord. The cavitating vortex core is to be generated in a lab by flow rotation and a convergent nozzle. The objective of this thesis is to compare experimental results with mathematical model of pressure drop in vortical flow and with numerical calculation in Fluent based on finite volumes method. Other objective is to messure high frequency pressure vibrations generated by cavitating vortex core and spectrally analyze the data.
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Cryptovirology and Future of Malware
Prchal, Josef ; Říha, Zdeněk (referee) ; Cvrček, Daniel (advisor)
Malware is connected to information technology. They influence each other. The aim of this thesis is to describe various types of this software and give a brief account of its history and development. It also discusses main trends of this area and tries to foretell the future development.
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Interface for Core of Antivir Software
Valouch, Tomáš ; Granát, Jiří (referee) ; Přibyl, Jaroslav (advisor)
This master's thesis is dealing with problematics of antivirus program development. It describe evolution of viruses, antiviruses and it is trying to estimate the future development in this area of interest. There is described a design of graphic user interface for antivirus program. Finally are dicussed possible approaches for implementing the graphics user interface for forementioned antivirus program. Important part of this thesis is part which is dealing with description of implementation of mentioned user interface.
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From tornado to hydraulic turbine
Jízdný, Martin ; Rinka, Lukáš (referee) ; Rudolf, Pavel (advisor)
This bachelor thesis deals with vortex motion and contains two main parts. The first part refers to the principles of creation and evolution of vortex motion in nature and in technological applications. In both of these fields it is possible to find positive and negative impacts of vortex motion which influence the world significantly. The second part of this bachelor thesis refers to an experiment which main goal was to verify some selected qualitites of vortex motion and to determine hypothesis based on measurements. The final part of the experiment deals with the different methods of making vortex motion visible in laboratory conditions.
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