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EPR study of radical reactions initiated by the decomposition of selected types of peroxy compounds
Krkošková, Petra ; Kučerík, Jiří (referee) ; Omelka, Ladislav (advisor)
The products of the decomposition of selected types of peroxo compounds in the presence of redox agents (Pb and Co compounds) were investigated by EPR method. Besides some commercial peroxides the study was performed with peroxo compounds of Luperoxide group (Luperox 101, Luperox 256, Luperox 531). For the detection of the decomposition products the technique of spin-trapping using nitrosobenzene was applied. EPR spectra of radical adducts formed by the reaction of the reactive oxygenous radicals with nitrosobenzen having the character of stable nitroxyl radicals were analyzed. Their EPR parameters were obtained by simulation method. Besides the addition to nitrosobenzene the generated oxygen centered radicals were proved also on the basis of their reaction with model compounds (Santonox R; 2,6–ditercbutyl–4–methylphenol; diphenylamine).
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Spin-trapping of radical products of H-transfer from carboneous donors
Krkošková, Petra ; Polovka, Martin (referee) ; Omelka, Ladislav (advisor)
On example of special type of a coumarine derivatives and also compounds with character of esters and diesters, which have an –CHR- group between two carbonyl groups or between carbonyl and imino group, the possibility of detection of C-radicals resulting from the homolytic splitting of the C-H bond of a methylene group was studied. PbO2 was used as an appropriate compound, on which surface the coumarine derivatives and the other compounds are decomposed. C-radicals were investigated by means of technique of spin-trapping and by comparison of experimental and simulated EPR spectra.
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Benefits of Purchasing Management in Relation to Optimize Inventory
Krkošková, Petra ; Adensam, Miroslav (referee) ; Jurová, Marie (advisor)
The diploma thesis is focused on inventory management in a production company with an emphasis on optimizing company´s stock level. There has been made an analysis of the current status of selected group of inventory, and of the use of the existing information system. Based on this analysis and theoretical knowledge of inventory management, two measures have been designed. They should help to increase efficiency of purchasing and to reduce inventory and costs.
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Benefits of Purchasing Management in Relation to Optimize Inventory
Krkošková, Petra ; Adensam, Miroslav (referee) ; Jurová, Marie (advisor)
The diploma thesis is focused on inventory management in a production company with an emphasis on optimizing company´s stock level. There has been made an analysis of the current status of selected group of inventory, and of the use of the existing information system. Based on this analysis and theoretical knowledge of inventory management, two measures have been designed. They should help to increase efficiency of purchasing and to reduce inventory and costs.
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EPR study of radical reactions initiated by the decomposition of selected types of peroxy compounds
Krkošková, Petra ; Kučerík, Jiří (referee) ; Omelka, Ladislav (advisor)
The products of the decomposition of selected types of peroxo compounds in the presence of redox agents (Pb and Co compounds) were investigated by EPR method. Besides some commercial peroxides the study was performed with peroxo compounds of Luperoxide group (Luperox 101, Luperox 256, Luperox 531). For the detection of the decomposition products the technique of spin-trapping using nitrosobenzene was applied. EPR spectra of radical adducts formed by the reaction of the reactive oxygenous radicals with nitrosobenzen having the character of stable nitroxyl radicals were analyzed. Their EPR parameters were obtained by simulation method. Besides the addition to nitrosobenzene the generated oxygen centered radicals were proved also on the basis of their reaction with model compounds (Santonox R; 2,6–ditercbutyl–4–methylphenol; diphenylamine).
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Spin-trapping of radical products of H-transfer from carboneous donors
Krkošková, Petra ; Polovka, Martin (referee) ; Omelka, Ladislav (advisor)
On example of special type of a coumarine derivatives and also compounds with character of esters and diesters, which have an –CHR- group between two carbonyl groups or between carbonyl and imino group, the possibility of detection of C-radicals resulting from the homolytic splitting of the C-H bond of a methylene group was studied. PbO2 was used as an appropriate compound, on which surface the coumarine derivatives and the other compounds are decomposed. C-radicals were investigated by means of technique of spin-trapping and by comparison of experimental and simulated EPR spectra.
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