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Recovery duration and its effect on acceleration
Filip, Ondřej ; Jebavý, Radim (advisor) ; Červinka, Pavel (referee)
Titel: Recovery duration and its effect on acceleration Objectives: The primary goal was to find out the effect of different recovery duration between sprints of 30 m distance. The secondary goal was to find out what are the views of trainers from different sports sectors on the interval of rest, the nature of the rest, and how they can influence the speed. Methods: Data for the results of my bachelor thesis were obtained by the method of testing and subsequent comparison of repeated speed runs to 4 x 30 m, among which there was a different interval of rest. Measurement was attended by 15 football players of adolescent age. Three groups of soccer players after a classic pre-match warm-up (warm-up, mobilization, and dynamic ballless exercises, ball exercises) have completed two runs of 30 meters, among which rest was 4 minutes. Subsequently, each group had a different recovery duration when GROUP I rested 10 minutes, GROUP II 20 minutes, and GROUP III 40 minutes. After a set recovery interval, the test was to complete a 5 minute run, which contained a shortened version of the special running excersizes and followed by another two runs of 30 meters with a 4 minute interval of rest. In total, 3 measurements were taken, and the groups changed all the intervals with the weekly spacing. Measured values...
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Factors Affecting the Start-up and the Efficiency of Nitrification Process during Biological Pre-treatment of Fugate
Brychtová, Martina ; Švehla, Pavel (advisor) ; Iva, Iva (referee)
The thesis deals with assessment of the effect of pH value, temperature, concentration of toxic forms of nitrogen, concentration of dissolved oxygen and other factors on the process of start-up of the nitrification reactor serving for biological pre-treatment of fugate. Another objective of this thesis is to assess the effect of the conditions prevailing in the reactor on the efficiency of transformation of N-ammon to oxidized forms of nitrogen.
During the system start-up, nitrifying activated sludge sampled from the regeneration zone of the activation process at the Central Waste Water Treatment Plant in Prague was used as inoculum. The laboratory model with suspended biomass consisted of a nitrification
reactor, the working volume of which was 1.5 l in the first part of the experiment and 5 l in the second part of the experiment. The system start-up lasted from 17 April 2015 to
approximately 12 May 2015 (days 0 to 32). N-ammon concentration in the inflow ranged from 1660 mg/l to 3000 mg/l. Volume loading of ammonia-nitrogen in the reactor ranged from 0.1 to 0.4 kg/(m3.d). During the experiment, the dissolved oxygen concentration ranged 3.6 to 6.8 mg/l, and the temperature range was 23 C°.
The performed experiment confirmed that it is possible to start up and maintain longterm the nitrification process also in fugate from a biogas station. It has been proved that despite the extreme characteristics of fugate, the nitrification process can be incorporated from the first days of the reactor operation. From the beginning of the experiment, N-NO3 was abundantly generated. N-ammon oxidizing efficiency ranged between 90 and 99 % and
influenced particular by pH values.
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