National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
The study of behavior of platinum nanoparticles in environmental compartments
Berka, Michal ; Řezáčová, Veronika (referee) ; Komendová, Renata (advisor)
Platinum nanoparticles pose a risk to environmental compartments. The aim of this diploma thesis is to conduct research on the influence of platinum nanoparticles in a wide range of concentrations on soil properties at different humidities. Specifically, it is about influencing the stability of water molecular bridges, the content of aliphatic crystallites, the retention capacity of water in the soil and the strength of water binding. Furthermore, the amount of nanoparticles sorbed on the soil was also measured. These indicators give us more information about the influence of platinum nanoparticles on evapotranspiration and soil deterioration. Methods of thermal analysis (differential scanning calorimetry) and optical methods (atomic absorption spectrometry) were used for these researches. The theoretical part of the work is devoted to a comprehensive introduction to platinum and its nanoparticles, as well as aqueous molecular bridges. It has been found that 200 nm platinum nanoparticles affect the strength of aqueous molecular bridges, have no effect on aliphatic crystallite content, have minimal effect on soil water retention, and that the water bond strength decreases due to platinum nanoparticles at high relative humidity. With 200 nm platinum nanoparticles, complete adsorption to soil occurs over the entire concentration range. With 3 nm nanoparticles, the soil is supersaturated at higher concentrations and larger amounts are not adsorbed. The results show that the larger the size of the platinum nanoparticles, the lower the negative effect on evapotranspiration and soil function itself.
Nanoparticles of platinum metals in the environment
Berka, Michal ; Kučerík, Jiří (referee) ; Komendová, Renata (advisor)
Platinum nanoparticles, mainly released from automotive catalysts, pose a potential risk to the environment. The aim of this bachelor thesis is to investigate the effect of platinum nanoparticles on soil properties at different humidities. Specifically, how nanoparticles affect the stability of hydrogen bridges, the stability of aliphatic crystals, and water retention in soil. For the analysis of relations between platinum nanoparticles, water and soil, a method of thermal analysis was used, namely differential scanning calorimetry. The theoretical part is devoted to the general introduction to platinum metals and nanoparticles. And the preparation of nanoparticles, their characterization and their properties. The result of the experiments is that platinum nanoparticles affect the soil properties relatively significantly.
Faktory úspěchu v rané fázi podnikání
Berka, Michal ; Lukeš, Martin (advisor) ; Andera, Michal (referee)
This thesis discusses factors of success in the process of new business venturing and growth in current business environment. It employs a sample of 200 entrepreneurial cases documented through interviews which were each broken into over 40 mainly quantitative criteria. Aided by simple statistical tools this result is then analyzed and evaluated, leading to a thorough analysis of each of the aspects discussed and finally culminating in conclusion stating which factors are the most significant. Besides purely academic interest, conclusions of this thesis could be of interest to both actual and prospective entrepreneurs.
Financial analysis of the Škoda Auto company
Berka, Michal ; Sieber, Patrik (advisor) ; Mikan, Pavel (referee)
This bachelor's thesis financially analyses the Skoda Auto company; years 2006-2010. Its first part focuses on methodology and necessary theory, while the second one deals right with the company the financial situation of which is to be scrutinized, with look at the sector as such where useful. The last part summarizes obtained results and attempts to give certain recommendations on how to improve the functionality of said enterprise.

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