|
|
Design and construction of a magnetorquer
Sedlařík, Marek ; Mačák, Martin (referee) ; Vyroubal, Petr (advisor)
This diploma thesis deals with the issue of satellite control using a magnetic field. Describes the physical principle of the magnetorquer and its interaction with the Earth's magnetic field. It contains a summary of advantages and disadvantages of individual solutions and their comparison with alternative control systems. Includes a search of currently available devices. It introduces the standardized CubeSat nanosatellites, their subsystems and ECSS standards, which define the parameters of equipment for space applications. It deals with the issue of the geomagnetic field, its fluctuations and describes selected orbits of the planet Earth. The main part of the work contains a description and implementation of the test system, which consists in the design of the printed circuit board, the program part of the test board and the user interface. This part also includes a detailed design and implementation of a two-axis magnetorquer, including simulations.
|
|
|
Orientation Control of Satellite - Laboratory Experiment
Neužil, Ondřej ; Baran, Ondřej (referee) ; Urbanec, Tomáš (advisor)
This diploma thesis is about the basics of satellite systems, about their sorting, usage and technologies. An important part is the description of the principles controlling and stabilization of the small experimental CubeSat type satellites. The main point is the proposition and construction of the laboratory model of the CubeSat type satellite that should simulate the chosen methods of controlling and stabilization in laboratory conditions. The thesis describes the construction of the electronic parts of the model, the controlling software of the satellite’s processor and user software for easy controlling by PC.
|
|
|
Basic measurement techniques of the magnetic resonance
Toufarová, Tereza ; Bartušek, Karel (referee) ; Steinbauer, Miloslav (advisor)
This thesis deals with basic principles of magnetic resonance. It describes this phenomenon from the point of view of quantum mechanics and classic physics. Both approaches differ considerably, however, it is necessary to combine both to describe the phenomenon. The main focus of the thesis is analysis of individual measuring methods and their mutual comparison. The methods described are Spin-Echo Method, Saturation Recovery Technique, Inversion Recovery Technique and Grandient-Echo Method. This document contains a theoretical description of imaging techniques and processing of pictures gained by practical application of the methods.
|
|
|
Design and construction of a magnetorquer
Sedlařík, Marek ; Mačák, Martin (referee) ; Vyroubal, Petr (advisor)
This diploma thesis deals with the issue of satellite control using a magnetic field. Describes the physical principle of the magnetorquer and its interaction with the Earth's magnetic field. It contains a summary of advantages and disadvantages of individual solutions and their comparison with alternative control systems. Includes a search of currently available devices. It introduces the standardized CubeSat nanosatellites, their subsystems and ECSS standards, which define the parameters of equipment for space applications. It deals with the issue of the geomagnetic field, its fluctuations and describes selected orbits of the planet Earth. The main part of the work contains a description and implementation of the test system, which consists in the design of the printed circuit board, the program part of the test board and the user interface. This part also includes a detailed design and implementation of a two-axis magnetorquer, including simulations.
|
|
|
Influence of the external pressure on the magnetic behavior of the material
Valenta, Jaroslav ; Prchal, Jiří (advisor) ; Prokleška, Jan (referee)
This thesis deals with magnetic properties of the HoCo2 compound, which is composed of rare earth and transition metal elements. The study is focused on properties at ambient pressure and changes of the magnetic behavior of the material under hydrostatic pressure. At the ambient pressure, there was performed analysis of the sample quality with a finding of presence of three magnetic transitions: flipping temperature magnetization of Co clusters Tf = (125 ± 1) K, Curie temperature TC = (79,5 ± 0,1) K and spin-reorientation temperature TR = (16,4 ± 0,5) K. When applying the hydrostatic pressure up to 3 GPa, there was observed a shift of the temperatures of the magnetic transitions and in the case Tf and TR their consequent vanishing. From the shifts of the TC and Tf towards lower temperatures and from the vanishing of the Tf, it was concluded that Co magnetism is being suppressed by the influence of the hydrostatic pressure.
|
|
|
Orientation Control of Satellite - Laboratory Experiment
Neužil, Ondřej ; Baran, Ondřej (referee) ; Urbanec, Tomáš (advisor)
This diploma thesis is about the basics of satellite systems, about their sorting, usage and technologies. An important part is the description of the principles controlling and stabilization of the small experimental CubeSat type satellites. The main point is the proposition and construction of the laboratory model of the CubeSat type satellite that should simulate the chosen methods of controlling and stabilization in laboratory conditions. The thesis describes the construction of the electronic parts of the model, the controlling software of the satellite’s processor and user software for easy controlling by PC.
|
|
|
Influence of the external pressure on the magnetic behavior of the material
Valenta, Jaroslav ; Prchal, Jiří (advisor) ; Prokleška, Jan (referee)
This thesis deals with magnetic properties of the HoCo2 compound, which is composed of rare earth and transition metal elements. The study is focused on properties at ambient pressure and changes of the magnetic behavior of the material under hydrostatic pressure. At the ambient pressure, there was performed analysis of the sample quality with a finding of presence of three magnetic transitions: flipping temperature magnetization of Co clusters Tf = (125 ± 1) K, Curie temperature TC = (79,5 ± 0,1) K and spin-reorientation temperature TR = (16,4 ± 0,5) K. When applying the hydrostatic pressure up to 3 GPa, there was observed a shift of the temperatures of the magnetic transitions and in the case Tf and TR their consequent vanishing. From the shifts of the TC and Tf towards lower temperatures and from the vanishing of the Tf, it was concluded that Co magnetism is being suppressed by the influence of the hydrostatic pressure.
|
|
|
Basic measurement techniques of the magnetic resonance
Toufarová, Tereza ; Bartušek, Karel (referee) ; Steinbauer, Miloslav (advisor)
This thesis deals with basic principles of magnetic resonance. It describes this phenomenon from the point of view of quantum mechanics and classic physics. Both approaches differ considerably, however, it is necessary to combine both to describe the phenomenon. The main focus of the thesis is analysis of individual measuring methods and their mutual comparison. The methods described are Spin-Echo Method, Saturation Recovery Technique, Inversion Recovery Technique and Grandient-Echo Method. This document contains a theoretical description of imaging techniques and processing of pictures gained by practical application of the methods.
|
guest ::
