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Ultrafast generation of anisotropic electron population in conduction band of semiconductors
Čmel, Martin ; Kozák, Martin (advisor) ; Dzurňák, Branislav (referee)
The thesis is devoted to a possible implementation of a new concept of electronics, the so-called valley-tronics, on an experimental optical setup. The aim is the construction of this setup that enables the study of the generation and detection of anisotropic distribu- tion of electrons in conduction band of diamond by means of interaction with ultrashort laser pulses. After understanding the topic, an optical setup based on an extended pump and probe method is assembled. The first pulse excites the electron population. A second pulse arriving with a given time delay accelerates the electrons and generates an aniso- tropic population in the conduction band. The generated anisotropy is measured by the third, probe pulse, with which the polarization anisotropy of the transient absorption is detected. As a part of the thesis, preliminary measurements are evaluated and the depen- dence of the relaxation time of valley polarization in diamond on the setup parameters is interpreted. This valley polarization could be used in the aforementioned valley-tronics, in which information would not be carried by charge, but by the electron valley number.
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Developing the explosive strength of the lower extremities of the players of the extra-league team in volleyball
Čmeľ, Martin ; Vorálek, Rostislav (advisor) ; Petružela, Jan (referee)
Title: Developing the explosive strength of the lower extremities of the players of the extra league team in volleyball. Subject: Measuring the jump height of twelve players of the extra league team. Objectives: Measure to see if it is possible, by systematically training the explosive strength of the lower extremities, to increase the jump height for volleyball players after a period of three months. Results: To compare the results of each single measurement with the first measurement performed prior to systematic training of the explosive strength of the lower extremities Key words: Development, explosive strenght, lower extremities, player, volleyball, team.
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Analysis of efficiency of the serve in woman's top division junior team
Čmeľ, Martin ; Vorálek, Rostislav (advisor) ; Kočíb, Tomáš (referee)
Title: Analysis of efficiency of the serve in woman's top division junior team Subject: The serve analysis of four teams in the final tournament of the woman's top division junior team 2016. Objectives: The main aim of this bachelor's thesis is to analyse a serve in term of its quality, success rate and the location to the competitor's field. The partial purpose is to find out, which team disposes of the best serve in woman's top division junior team 2016. Results: To characterize and to compare recorded results of chosen individual playing skills of the selected teams. Key words: Match, team, players, individual playing skills, serve
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