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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.
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Interaction of architecture with geomagnetic field
Holá, Magda ; Ing.David Eyer (referee) ; RNDr.Eleonora Čermáková (referee) ; Menšíková, Naděžda (referee) ; Žabičková, Ivana (advisor)
With the application of new technological trends and principles of scientific research in general, places on environmental influences (everything what surrounds human - building interior and exterior materials, urban areas) and also with sustainable development and ecology, etc., and on health and psychological well-being humans and thus puts on architecture and building entirely new demands on the application of new principles. Due to global climate change, which recently published the official report of the International Panel on Climate Change (IPCC), are placed on reducing the emissions into the atmosphere greater demands on. If architects previously were requested by the client, building with optimal solutions and functional expression of aesthetic quality, so now in addition to increasing demand on building´s solution with low power consumption using environmentally friendly materials from renewable resources and completely satisfying idea of sustainable development. Global societal trends is reverting to the traditional approaches to creating an environment (the application of natural materials, Feng Shui, Building Biology, etc.). The growing trend in today's society on issues of sustainable development, conservation of natural conditions, examining the effects of construction on human health and psychological well-being, which the aims bring together experts seemingly unrelated fields such as geophysics, medicine, architecture, civil engineering, etc., and their findings, according to aspects of the disciplines draw general rules of healthy living. Emerging and still evolving field aims to examine the relationship between man and his environment. The logical starting point is therefore in the context of examining the structure of the first dwelling. Buildings where people spend at least one third of their life. Building, whose location, orientation, mass, materials used in building itself as well as those that surround people in the interior, and many others will affect the physical and physiological action. Not only health but also mental well-being of man is as much determined by a whole range of relationships and linkages. Structural system guidelines for healthy living is the main reason of the work, clear what assumptions we have taken into account in the design and how it specifically relates to a quality place to rest – the Geomagnetic field is one of the base point, which lead to healthy living. Interaction of architecture and geomagnetic field and their values are processed in the evaluation system. It would lead to clarification of the relationship between the occurrence of these anomalies and building materials, construction, site selection for construction of buildings and other solutions. I will desribing the relationship between human´s health and the incidence of these artificial or natural anomalies at the same time.
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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.
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Magnetic orientation in mammals
Tejmlová, Kristýna ; Němec, Pavel (advisor) ; Vácha, Martin (referee)
Earth's magnetic field can provide animal with both directional and positional information. The ability to perceive and utilize information extracted from the geomagnetic field is called magnetoreception. Magnetoreception mechanisms remain largely unknown. Three main hypotheses are currently supported by experimental evidence. The light-independent mechanisms are based either on electromagnetic induction or on biogenic magnetite. The light-dependent mechanism is based on specific chemical reaction between radical pairs. Perception of the geomagnetic field facilitates both long- and short-distance orientation of animals. Some animals exhibit the magnetic alignment, i.e., spontaneuos preference for a certain geomagnetic direction. Another manifestation of magnetoreception is magnetic compass (polarity- or inclination-based, depending on species), which enable an animal to determine the azimuth, i.e., the angle between the direction of motion and geomagnetic field vector. Magnetic map sense enable an animal to determine its position and direction to the goal destination, most likely utilizing the inclination and the intensity of the geomagnetic field as navigational cues. Magnetic orientation of mammals seems to be a widespread phenomenon. Light- independend, polarity compass has been reported in...
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Frequency changes in normal and reversed polarities of geomagnetic field
Olšanská, Irena ; Kletetschka, Günther (advisor) ; Pruner, Petr (referee)
This work consits of two parts, literature review and practical section. Literature review covers essential knowledge about magnetic field of Earth in attempt of understanding its inversion events. This section contains thistory of research of geomagnetism, key theories, physical quantities, magnetic properties of the minerals and outlines the knowledge of paleomagnetism. Practical part concerns the analysis of geomagnetic field inversions. It deals with inversions that happened during the last 157, 53 million years (Gee and Kent, 2007) and compares the duration of normal and reversal polarity and both types together. Statistical methods of investigation,namely Gaussian distribution and frequency, were employed. The evaluation of results showed that the average time between two inversions is: 124 000 years for normal, 450 000 years for reversal and 287 000 years for both types. The intervals shortened over last 80 million years. Comparing the frequencies of each period following results were obtained: both types usually lasts about 350 000 years, periods that are shorter than 350 000 years appears more often for normal polarity, but the frequencies of longer periods are similar for both types.
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Earth as a dynamic body
Dlask, Martin ; Čížková, Hana (advisor) ; Drozd, Zdeněk (referee)
The aim of this bachelor thesis is to serve as explanatory instrument for teachers and their students during geography and physics classes on gymnasiums. The main goal of this thesis is to extend the knowledge of physics the Earth. This thesis is primaryly focused on introducing the Earth as dynamic body.I explain, that energy released during cooling of the Earth is responsible for plate tectonics, volcanic and seismic activity, and internal magnetic field. Powered by TCPDF (www.tcpdf.org)
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Magnetic survey in Pruhonice park
Bartášková, Lucie ; Kletetschka, Günther (advisor) ; Blecha, Vratislav (referee)
The aim of the thesis was to get acquainted with the measurement of the magnetic field of the earth on a concrete example, in Průhonice Park, where the geological structures are covered pond, and there is direct access to rock. It was also proposed vessel for measuring the magnetic field on the surface of the water. The measurement result was compared with existing geological maps and interpreted in terms of magnetic sources. On the basis of familiarity with the course of magnetometric data acquisition and processing the earth was proposed procedure for measuring the magnetic field of the planet Mars. Powered by TCPDF (www.tcpdf.org)
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Magnetic orientation in mammals
Tejmlová, Kristýna ; Němec, Pavel (advisor) ; Vácha, Martin (referee)
Earth's magnetic field can provide animal with both directional and positional information. The ability to perceive and utilize information extracted from the geomagnetic field is called magnetoreception. Magnetoreception mechanisms remain largely unknown. Three main hypotheses are currently supported by experimental evidence. The light-independent mechanisms are based either on electromagnetic induction or on biogenic magnetite. The light-dependent mechanism is based on specific chemical reaction between radical pairs. Perception of the geomagnetic field facilitates both long- and short-distance orientation of animals. Some animals exhibit the magnetic alignment, i.e., spontaneuos preference for a certain geomagnetic direction. Another manifestation of magnetoreception is magnetic compass (polarity- or inclination-based, depending on species), which enable an animal to determine the azimuth, i.e., the angle between the direction of motion and geomagnetic field vector. Magnetic map sense enable an animal to determine its position and direction to the goal destination, most likely utilizing the inclination and the intensity of the geomagnetic field as navigational cues. Magnetic orientation of mammals seems to be a widespread phenomenon. Light- independend, polarity compass has been reported in...
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Interaction of architecture with geomagnetic field
Holá, Magda ; Ing.David Eyer (referee) ; RNDr.Eleonora Čermáková (referee) ; Menšíková, Naděžda (referee) ; Žabičková, Ivana (advisor)
With the application of new technological trends and principles of scientific research in general, places on environmental influences (everything what surrounds human - building interior and exterior materials, urban areas) and also with sustainable development and ecology, etc., and on health and psychological well-being humans and thus puts on architecture and building entirely new demands on the application of new principles. Due to global climate change, which recently published the official report of the International Panel on Climate Change (IPCC), are placed on reducing the emissions into the atmosphere greater demands on. If architects previously were requested by the client, building with optimal solutions and functional expression of aesthetic quality, so now in addition to increasing demand on building´s solution with low power consumption using environmentally friendly materials from renewable resources and completely satisfying idea of sustainable development. Global societal trends is reverting to the traditional approaches to creating an environment (the application of natural materials, Feng Shui, Building Biology, etc.). The growing trend in today's society on issues of sustainable development, conservation of natural conditions, examining the effects of construction on human health and psychological well-being, which the aims bring together experts seemingly unrelated fields such as geophysics, medicine, architecture, civil engineering, etc., and their findings, according to aspects of the disciplines draw general rules of healthy living. Emerging and still evolving field aims to examine the relationship between man and his environment. The logical starting point is therefore in the context of examining the structure of the first dwelling. Buildings where people spend at least one third of their life. Building, whose location, orientation, mass, materials used in building itself as well as those that surround people in the interior, and many others will affect the physical and physiological action. Not only health but also mental well-being of man is as much determined by a whole range of relationships and linkages. Structural system guidelines for healthy living is the main reason of the work, clear what assumptions we have taken into account in the design and how it specifically relates to a quality place to rest – the Geomagnetic field is one of the base point, which lead to healthy living. Interaction of architecture and geomagnetic field and their values are processed in the evaluation system. It would lead to clarification of the relationship between the occurrence of these anomalies and building materials, construction, site selection for construction of buildings and other solutions. I will desribing the relationship between human´s health and the incidence of these artificial or natural anomalies at the same time.
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History of magnetic measurements in Bohemia and long-term changes of ge.magnetic field components
Střeštík, Jaroslav
Regular measurement of components of the Earth's magnetic field started in Klementinum in Prague in 1830 as the first on the European continent, and finished in 1926. Contemporary Czech geomagnetic observatories cover the period since 1952 till now. Together with the data from Niemegk it is possible to convert all values so that a coherent series 1830-2007 can be prepared. Magnetic declination increases during the whole period, the speed of the increase regularly varies with the period of about 74 years. The last minimum was observed in 1910, maximum in 1947. The intensity of the field in the horizontal component varies too with nearly the same period and nearly the same positions of maxima and minima.
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