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Study of leaded and lead-free perovskite nanoparticles properties
Holečková, Jana ; Zdražil, Lukáš (referee) ; Zmeškal, Oldřich (advisor)
This master thesis examines optical properties of lead and lead-free perovskite nanoparticles. Two types of perovskite nanoparticle solutions with lead or bismuth were prepared. One type was hybrid inorganic-organic perovskite nanoparticles, either containing bromine anions or chlorine anions. The second type was purely inorganic perovskite nanoparticles, also containing either bromine anions or chlorine anions. During synthesis were used different solvents. Solutions were characterized by dynamic light scattering, fluorescence spektrometry and UV-VIS spectrophotometry. The measured results were discussed.
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Changing of children body posture before entering elementary school
Holečková, Jana ; Dvořáková, Hana (advisor) ; Jahodová, Gabriela (referee)
The bachelor thesis deals with the problem of the posture of pre-school children. The aim was to found out the posture of two age similar groups of pre-school children at the beginning and at the end of the final year before entering the primary school and to verify if there are some changes in posture at this time period. I used two tests to assess the posture, perspective method Klein, Thomas and Mayer in combination with the build evaluation according to Jaros and Lomicek. I was gaining the research data also by the observation method of common day running in two pre-school institutions and by the method of half-structured interview with class teachers ofthese institutions. Research file formed two age similar groups of pre-school children, specifically children from the last year of a kindergarden and children from preliminary classes. The result of the research is the finding out that in the last year, before entering the primary school, come about negative changes at posture of the pre-school children and that points to the fact that even pre-school age is high risk from posture point of view. KEY WORDS Body posture evaluation Defective body posture Pre-school child Kindergarden Preliminary class Motion activity
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