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Hydrogen production
Poláčik, Ján ; Fiedler, Jan (referee) ; Pospíšil, Jiří (advisor)
The thesis deals with water electrolysis focusing in particular on pulse electrolysis. The theoretical part characterizes hydrogen and its properties as well as the ways of its use and storage. It also analysis various methods of hydrogen generation. It examines in details water electrolysis and its energetic and chemical balance. There is also an evaluation of water electrolysis efficiency and its improvement followed by pulse electrolysis description. Laboratory equipment for direct current and pulsed direct current hydrogen production are suggested. Theoretical expectations are tested experimentally. Finally the thesis presents the results of measurements, compares and summarizes the data. It points out the contribution of this type of electrolysis with its effectiveness. It proposes uses of electrolysis and the subsequent research.
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Water jet cutting of material
Jáchym, Jan ; Fialová, Simona (referee) ; Habán, Vladimír (advisor)
This bachelor thesis describes principles developement and usage of high - speed water jets for cutting. In the first part, it features description water jet cutting technology and its application, basic parts of high pressure system and sorts of generators pressure. In the second part, it divides water jet according to discreteness in time and chemical constitution. In the third part, it deal with studies usage so - called pulse jets, especially at ultrasonically modulated ones. It is described mechanism rise and break up of modulated high - speed jet on individual pulses.
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Development of UHV STM/AFM
Pavelec, Jiří ; Neuman, Jan (referee) ; Kalousek, Radek (advisor)
The main focus of the thesis is on the actuator, which is used for nanopositioning of laser beam in-site AFM (Atomic Force Microscopy). The appropriate shape of supply pulse and frequencies were searched and optimized. They make slip-stick motion of the piezo actuator. Possibilities of solving troubles with UHV (Ultra High Vacuum) are described on the basis of experiment and simulation.
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Development of a linear stage actuator for UHV STM/AFM
Pavelec, Jiří ; Jiruše, Jaroslav (referee) ; Šikola, Tomáš (advisor)
The aim of this diploma thesis is to develop a linear positioning stage for Ultra High Vacuum (UHV) environment. Simple prototypes of the linear positioning stage were designed and incorporated as part of a multiaxis sample manipulator for a UHV Scanning Tunneling Microscopy / Atomic Force Microscopy (STM/AFM). Different types of position encoders and linear guideways are discussed. Implementation of the homodyne interferometer as an optimization tool for a slip-stick based linear stage is described. Scalar diffraction theory is used to model the diffraction grating optical position encoder behavior.
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Hydrogen production
Poláčik, Ján ; Fiedler, Jan (referee) ; Pospíšil, Jiří (advisor)
The thesis deals with water electrolysis focusing in particular on pulse electrolysis. The theoretical part characterizes hydrogen and its properties as well as the ways of its use and storage. It also analysis various methods of hydrogen generation. It examines in details water electrolysis and its energetic and chemical balance. There is also an evaluation of water electrolysis efficiency and its improvement followed by pulse electrolysis description. Laboratory equipment for direct current and pulsed direct current hydrogen production are suggested. Theoretical expectations are tested experimentally. Finally the thesis presents the results of measurements, compares and summarizes the data. It points out the contribution of this type of electrolysis with its effectiveness. It proposes uses of electrolysis and the subsequent research.
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Development of a linear stage actuator for UHV STM/AFM
Pavelec, Jiří ; Jiruše, Jaroslav (referee) ; Šikola, Tomáš (advisor)
The aim of this diploma thesis is to develop a linear positioning stage for Ultra High Vacuum (UHV) environment. Simple prototypes of the linear positioning stage were designed and incorporated as part of a multiaxis sample manipulator for a UHV Scanning Tunneling Microscopy / Atomic Force Microscopy (STM/AFM). Different types of position encoders and linear guideways are discussed. Implementation of the homodyne interferometer as an optimization tool for a slip-stick based linear stage is described. Scalar diffraction theory is used to model the diffraction grating optical position encoder behavior.
|
|
|
Water jet cutting of material
Jáchym, Jan ; Fialová, Simona (referee) ; Habán, Vladimír (advisor)
This bachelor thesis describes principles developement and usage of high - speed water jets for cutting. In the first part, it features description water jet cutting technology and its application, basic parts of high pressure system and sorts of generators pressure. In the second part, it divides water jet according to discreteness in time and chemical constitution. In the third part, it deal with studies usage so - called pulse jets, especially at ultrasonically modulated ones. It is described mechanism rise and break up of modulated high - speed jet on individual pulses.
|
|
|
Development of UHV STM/AFM
Pavelec, Jiří ; Neuman, Jan (referee) ; Kalousek, Radek (advisor)
The main focus of the thesis is on the actuator, which is used for nanopositioning of laser beam in-site AFM (Atomic Force Microscopy). The appropriate shape of supply pulse and frequencies were searched and optimized. They make slip-stick motion of the piezo actuator. Possibilities of solving troubles with UHV (Ultra High Vacuum) are described on the basis of experiment and simulation.
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