National Repository of Grey Literature 16 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
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...
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...
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 .
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...
Dust trap for light scattering study
Bartoň, Petr ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee)
Title: Dust trap for light scattering study Author: Petr Bartoň Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jiří Pavlů, Ph.D., Department of Surface and Plasma Science Abstract: Light scattering on small grains is common interaction occurring wi- dely in space environments, including Moon surface, dusty nebulas or even the upper atmosphere of the Earth. For experimental measurements of light scatte- ring intensity profiles, we designed and constructed a unique experiment. Using so called acoustic trapping, we are able to capture a single dust grain (or small water droplet) in midair, to irradiate it with the laser beam, and to observe scattered light directly with the photodiode mounted on a precise goniometer. In the thesis, we present not only construction details, but also the first results, which help us to evaluate abilities of the experiment, and provide useful recommendations for further development of all dust-related experiments. Keywords: light scattering, acoustic trap, dust grain, scattering measurement 1
Algortihms for proving primality
Pavlů, Jiří ; Šťovíček, Jan (advisor) ; Žemlička, Jan (referee)
The goal of the thesis is introducing the reader to some of the algori- thms for proving primality along with practical usage of some of these algorithms. The main objective of the thesis is a presentation of Goldwasser-Killian primality test, which can be used to produce primality certificates, which can be verified very quickly. For better understanding of the test the thesis also includes an in- troduction to elliptic curves, which are the basis of the test. The thesis also shows how is a group of points on elliptic curves constructed and how to use this infor- mation for construction of algebraic formula for a sum of two points on a curve. Powered by TCPDF (www.tcpdf.org)
Proposal of ultrasonic trap
Bartoň, Petr ; Pavlů, Jiří (advisor) ; Vyšinka, Marek (referee)
Light scattering by dust grains is a complex problem when the size of the grain is about the wavelength of incident light. The Mie theory is often used to characterize such situtation, however, most of the materials lacks knowledge of neccessary material constants. Moreover, solution of Mie equations for general shapes is difficult and partly not known. Objective of this work is development of apparatus for light scattering measurements on small (micrometer ranged) ar- bitrary shaped dust grains levitating in the ultrasonic field. Trap parameters are obtained by survey of literature and by numeric simulations leading to design of reliable ultrasonic levitator including optical system. The results enable manu- facturing and completion of such apparatus. Eventually, this work can serve as guide "how to design ultrasonic levitator".
Automation of dust charging experiment
Pechal, Radim ; Pavlů, Jiří (advisor) ; Žilavý, Peter (referee)
Title: Automation of dust charging experiment Author: Radim Pechal Department: Department of Surface and Plasma Science Supervisor: RNDr. Jiří Pavlů, PhD. Supervisor's e-mail address: Jiri.Pavlu@mff.cuni.cz Abstract: Since the dust grains are expected to cause problems during operation of tokamaks, there is a developing research of these devices which raises interest in dust grain charging processes research as well. Clarification of the dust grain charging processes may help with their solutions. This thesis deals with an issue of designing a part of a new experimental setup for dust grain research built at the Department of Surface and Plasma Science, Charles University in Prague. The base of this experimental setup is original linear quadrupole trap enabling dust grain trapping and its charging by electron, ion, and UV beams. In the thesis, a method of stabilization of one part of grain oscillation frequency detection is described. The thesis is focused on a development of a control unit and high voltage power supply for an image intensifier. To measure charging processes tungsten dust grains were used. This material will be probably used in construction of ITER tomakak. Electron equilibrium characteristics and other parameters were measured. Two samples of tungsten dust grains were used for...
Ionization methods of vacuum measurement
Pračko, Milan ; Gronych, Tomáš (advisor) ; Pavlů, Jiří (referee)
The Diploma thesis concerns with problems of measurement pressure of vacuum systems, with pressure lower than 10-6 Pa. Although most of the basic constructions of vacuum gauge for these levels of pressure was developed in the beginning of 1960s, the new constructions and modifications are still appearing. Ionization vacuum gauge 3BG (Bent Belt-Beam gauge) is one of them. Predisposition of 3BG for measurement of pressure lower than 10-6 Pa is verified by means of experimental verifying of characteristics of the brand new construction of vacuum gauge 3BG and by theoretical description of behaviour of the electrons in geometry 3BG, using computer simulation. Experimental specification of the most favourable parameters for operation of vacuum gauge 3BG is used for reaching maximal sensitivity with the cathode load at the lowest possible level. Powered by TCPDF (www.tcpdf.org)
Dust-UV interaction
Nouzák, Libor ; Pavlů, Jiří (advisor) ; Žilavý, Peter (referee)
Title: Dust - UV interaction Author: Libor Nouzak Department: Department of Surface and Plasma Science Supervisor: RNDr. Jiri Pavlu, Ph.D. Supervisor's e-mail address: jiri.pavlu@mff.cuni.cz Abstract: Micrometer objects (dust grains) are an integral part of the universe. As other objects in the plasma, these dust grains charge to potencial close to the potencial of the plasmas (in this case, interplanetary plasma). In the universe, the photoelectric charging dust grain dominantes all other charging processes. In general, the resulting charge of dust grain is given by a balance of all processes, which haven't been mostly jet theoretically described. In our laboratory, we are simulating space conditions and measure resulting charge and his changes on a single separated dust grain. This work is partly focused to UV source application and to finishing its electronics, and partly on test measurements and model calculations, connected with newly built experiment (e.g., to estimate effects of backgound currents, surfaces, and the geometry of the dust trap electrodes). The work is finished by the first measurements of glass grain charge under electron bombardment with provisional detection optics. Obtained results are compared with previous measurements on the same type of dust grains. Key words: dust, dusty plasma,...

National Repository of Grey Literature : 16 records found   1 - 10next  jump to record:
See also: similar author names
5 Pavlů, Jan
3 Pavlů, Jana
1 Pavlů, Jaroslav
1 Pavlů, Jindřich
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