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Laboratory investigation of dust charging and impact ionization
Nouzák, Libor ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee) ; Souček, Jan (referee)
Dust is an almost ubiquitous component of the cosmic plasma (e.g., planetary and cometary magnetospheres, the heliosphere, the interstellar medium, supernova shells). However, it can be also frequently encountered in industrial applications as a principal agent in material treatments, or as an undesirable ingredient in a production of microelectronic components, or in fusion devices. Since dust particles are one of the main elements of interest in the solar system (e.g., Earth, Jovian and Saturnian systems) and in the interstellar medium, there is a number of missions (e.g., ROSETTA, Cassini) that provided investigations of the properties and global dynamics of charged dust grains. In these environments, the relevant charging processes are interactions with electrons and ions of the solar wind and photoemission by solar UV radiation that often dominates. However, in-site investigations of such processes are difficult because several processes act in accord. The present thesis studies charging processes in laboratory settings where these processes can be investigated separately. In the first series of experiments focused on applications in the lunar or planetary surroundings, a single (charged) dust grain is stored in an electrodynamic trap and expose to electron and/or ion beams with variable energies and...
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Development of UV detector for space applications
Kočiščák, Samuel ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee)
Title: Development of UV Detector for Space Applications Author: Samuel Kočiščák Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jiří Pavlů, Ph.D., Department of Surface and Plasma Science Abstract: It is not unusual that space measurement is influenced by UV irradia- tion causing photoemission on delicate electronic components. Therefore informa- tion on UV irradiance is very useful. Particularly useful is non-delayed, immediate quantitative information (on a time scales of seconds) identifying unexpected va- riation in the irradiance of such electronic parts. The goal was to construct a prototype, measure basic properties and discuss ca- pabilities of a detector capable of continuous measurement of UV irradiance of a spacecraft, working on the principle of photoemission alone. We have success- fully shown the capabilities of a prototype and established some of its key basic properties, e.g. their stability in cosmic environment. Keywords: VUV, Faraday cup, UV detector, UV transmittance, solar wind
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Evaluation of red blood count and biochemical parameters in elite runners - a case study
Pavlů, Jiří ; Červinka, Pavel (advisor) ; Semerád, Miroslav (referee)
Title: Evaluation of red blood count and biochemical parameters in elite runners - a case study Aims: The main goal of this work is to determine the dynamics of biochemical parameters and red blood count in relation to the individual phases of year training cycle in two elite runners on medium and long distances. The second goal is to examine the data with the intention of discovering the character of the trend of individual parameters in terms of four seasonal testing for each of the probands. Methods of work: he method of content analysis of record sheets related to red blood count (RBC, HGB, HCT, MCV, MCH, MCHC, RDW) and biochemical parameters (iron, transferrin, ferritin, iron saturation of transferrin) was used to develop the work. These sheets were provided to me by the coach of both probands. The provided data were recorded in tables which were the basis for the graphs in the final part of the work. The graphs were used to monitor the fluctuation of the values of individual parameters with respect to the RTC of each season, and possible mutual relations in the variability of these parameters were sought. The long-term trend was also examined in terms of the dynamics of the parameters. Results: The measured values of individual parameters of the athletes studied by me are in the range of...
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Experimental study of electron and ion temperatures in impact plasmas
Kočiščák, Samuel ; Pavlů, Jiří (advisor) ; Wild, Jan (referee)
Title: Experimental study of electron and ion temperatures in impact plasmas Author: Samuel Kočiščák Department: Department of Surface and Plasma Science - DSPS Supervisor: doc. RNDr. Jiří Pavlů, Ph.D., DSPS Abstract: In-situ analysis of a hypervelocity grain impact is a complex discipline, making use of multiple physical phenomena. An important one, if not the most important one, being a dust impact ionisation. Future experiments could benefit substantially from better understanding of the phenomenon. The goal of this work was a study of the impact ionisation per-se, with the objective: to experimentally determine the effective temperatures of post-impact charged ejecta. Importance of this parameter is obvious, although different approaches scarcely ever report similar results. Our way was the analysis in a retarding potential analyzer. Firstly, large data set of laboratory data from dust accelerator was analyzed, secondly a Monte Carlo study of the results and the analyzer itself was performed. Lastly, recommendations for future in-situ experiments are provided based on our results. Keywords: impact plasmas cosmic dust impact ionization
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Laboratory investigation of dust charging and impact ionization
Nouzák, Libor ; Pavlů, Jiří (advisor)
Dust is an almost ubiquitous component of the cosmic plasma (e.g., planetary and cometary magnetospheres, the heliosphere, the interstellar medium, supernova shells). However, it can be also frequently encountered in industrial applications as a principal agent in material treatments, or as an undesirable ingredient in a production of microelectronic components, or in fusion devices. Since dust particles are one of the main elements of interest in the solar system (e.g., Earth, Jovian and Saturnian systems) and in the interstellar medium, there is a number of missions (e.g., ROSETTA, Cassini) that provided investigations of the properties and global dynamics of charged dust grains. In these environments, the relevant charging processes are interactions with electrons and ions of the solar wind and photoemission by solar UV radiation that often dominates. However, in-site investigations of such processes are difficult because several processes act in accord. The present thesis studies charging processes in laboratory settings where these processes can be investigated separately. In the first series of experiments focused on applications in the lunar or planetary surroundings, a single (charged) dust grain is stored in an electrodynamic trap and expose to electron and/or ion beams with variable energies and...
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Development of UV detector for space applications
Kočiščák, Samuel ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee)
Title: Development of UV Detector for Space Applications Author: Samuel Kočiščák Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jiří Pavlů, Ph.D., Department of Surface and Plasma Science Abstract: It is not unusual that space measurement is influenced by UV irradia- tion causing photoemission on delicate electronic components. Therefore informa- tion on UV irradiance is very useful. Particularly useful is non-delayed, immediate quantitative information (on a time scales of seconds) identifying unexpected va- riation in the irradiance of such electronic parts. The goal was to construct a prototype, measure basic properties and discuss ca- pabilities of a detector capable of continuous measurement of UV irradiance of a spacecraft, working on the principle of photoemission alone. We have success- fully shown the capabilities of a prototype and established some of its key basic properties, e.g. their stability in cosmic environment. Keywords: VUV, Faraday cup, UV detector, UV transmittance, solar wind
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Analysis of general strength conditioning for runners - case study
Pavlů, Jiří ; Červinka, Pavel (advisor) ; Kaplan, Aleš (referee)
Title: Analysis of general strength conditioning for runners - case study Elaborated: Jiri Pavlu Supervisor: RNDr., PaedDR. Pavel Cervinka, Ph.D. Aims: The aim of this thesis is the analysis of two preparatory periods (2017-2018; 2018-2019) in terms of general strength conditioning. After this content analysis I will compare them with each other and then with the literature. Data will be collected and analyzed from training diaries. Methods of work: This thesis was created using content analysis method from two preparation periods. The training notes were provided by Dukla Praha top runners specialized on middle and long tracks. The acquired data focusing just on general strength preparation were compared to professional literature and then with each other. Comparative method was used for this comparison. Results: The amount of training units aiming at development of general strength abilities compared to literature is less than idealized. The overal ratio of general strength preparation to the total volume of load was higher in the first preparation period. The most used method which occured in the examined files was strength-endurance method and was practised in the form of circuit training. The main means of training which was apparent in almost all training units was self-weight exercise. Key...
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Laboratory investigation of dust charging and impact ionization
Nouzák, Libor ; Pavlů, Jiří (advisor)
Dust is an almost ubiquitous component of the cosmic plasma (e.g., planetary and cometary magnetospheres, the heliosphere, the interstellar medium, supernova shells). However, it can be also frequently encountered in industrial applications as a principal agent in material treatments, or as an undesirable ingredient in a production of microelectronic components, or in fusion devices. Since dust particles are one of the main elements of interest in the solar system (e.g., Earth, Jovian and Saturnian systems) and in the interstellar medium, there is a number of missions (e.g., ROSETTA, Cassini) that provided investigations of the properties and global dynamics of charged dust grains. In these environments, the relevant charging processes are interactions with electrons and ions of the solar wind and photoemission by solar UV radiation that often dominates. However, in-site investigations of such processes are difficult because several processes act in accord. The present thesis studies charging processes in laboratory settings where these processes can be investigated separately. In the first series of experiments focused on applications in the lunar or planetary surroundings, a single (charged) dust grain is stored in an electrodynamic trap and expose to electron and/or ion beams with variable energies and...
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Hledání APN permutací ve známých APN funkcích
Pavlů, Jiří ; Göloglu, Faruk (advisor) ; Drápal, Aleš (referee)
In the thesis a new way of checking whether a function is CCZ-equivalent to a permutation is given. The results for known families of almost perfect nonlinear (APN) functions are presented for functions defined over GF(2n ), for even n ≤ 12. The ways how to reduce the number of polynomials from each family are studied. For functions of the form x3 + a-1 tr1(a3 x9 ) it is shown, that they cannot be CCZ-equivalent to a permutation on fields GF(24n ) for n ∈ ℕ .
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Laboratory investigation of dust charging and impact ionization
Nouzák, Libor ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee) ; Souček, Jan (referee)
Dust is an almost ubiquitous component of the cosmic plasma (e.g., planetary and cometary magnetospheres, the heliosphere, the interstellar medium, supernova shells). However, it can be also frequently encountered in industrial applications as a principal agent in material treatments, or as an undesirable ingredient in a production of microelectronic components, or in fusion devices. Since dust particles are one of the main elements of interest in the solar system (e.g., Earth, Jovian and Saturnian systems) and in the interstellar medium, there is a number of missions (e.g., ROSETTA, Cassini) that provided investigations of the properties and global dynamics of charged dust grains. In these environments, the relevant charging processes are interactions with electrons and ions of the solar wind and photoemission by solar UV radiation that often dominates. However, in-site investigations of such processes are difficult because several processes act in accord. The present thesis studies charging processes in laboratory settings where these processes can be investigated separately. In the first series of experiments focused on applications in the lunar or planetary surroundings, a single (charged) dust grain is stored in an electrodynamic trap and expose to electron and/or ion beams with variable energies and...
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