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Impact of input parameters variation on fabrication of nanoporous alumina
Hriczo, Filip ; Macháčková, Marina (referee) ; Hrdý, Radim (advisor)
This thesis examines and tests acids and conditions, which make the production of nanoporous ceramic at the thin aluminium layer the most effective and provide the highest quality. This paper describes the production of nanoporous structures with pore size 15-400 nm, depending on the electrolyte. Creating a regular hexagonal structure by electrochemical oxidation is dependent on many parameters that affect the regularity of structure and parameters of the ceramics produced. They were investigated primarily by changes in temperature and input voltage. All results were examined by SEM analysis.
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Možnosti využití vyhnilých kalů z městské čistírny k pyrolýze a jejich použití v sorpčních procesech na příkladu kyseliny šťavelové
PRAŽÁK, Jakub
This diploma thesis is focused on sludge management of waste water treatment plants. The research part of the thesis outlines the problems of sludge management in the Czech Republic and also deals with technologies and technical solutions related to the treatment and handling of sewage sludge for various purposes. Furthermore, the theoretical part describes the function of urban wastewater treatment plants and technological methods of wastewater treatment. I also focus on energy utilization of sewage sludge in pyrolysis processes. The result of these pyrolysis processes is called Biochar. Biochar is a carbon thick solid that arises from the pyrolysis of organic materials for application to soil and other uses such as biofuels. The carbon that remains in the solid forms stable aromatic structures that are more resistant to degradation in the natural environment. The mineral ash content of the original organic materials is preserved in the biochart and the volatile constituents of the raw material are lost during the pyrolysis process. In the second part of the work, the prepared and modified samples of the biochar are subjected to the determination of the sorption properties in order to determine whether the biochar is able to transfer the nutrients contained in it to the soil. If the biochar were able to transfer nutrients to the soil without any undesirable side effects, it could very much solve the problem of its future storage.
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Oxalates in rocks and plants
Novotná, Julie ; Jehlička, Jan (advisor) ; Hruška, Jakub (referee)
SUMMARY: The presence of oxalates is widespread not only as kidney stones, but in whole nature. It is well known that oxalates are products of some plants, fungi and lichens. The accumulates of calcium oxalates are increased in: sorrel, rhubarb, spinach, soya, dieffenbachia, etc. Oxalates serve many important functions in plants such as calcium regulation, protection from herbivory and metal detoxification. Aluminum detoxification is ability of plants, which is critical factor for crop production. Breeding of commercially viable low oxalate cultivars or genetic manipulation with crops should deal to enhance of nutritional quality and enhance of agricultural production too. The presentation of oxalates in rocks is well representing by calcium oxalate minerals, whewellite and weddellite. Minerals occur in sediments into precipitated forms within concretions and hydrothermal veins or dispersed form into modern sediments, e.g. peats. Oxalates are biologic products, therefore they can indicate biological activities, so oxalates should be sought for researching on cosmic objects. The observation of oxalates on Earth and interpretation of the Raman spectra is necessary in these types of study.
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Ověření využití kyseliny šťavelové k tlumení varroózy v chovatelské praxi
Hanulíková, Veronika
The aim of the thesis was to find out if is possible use only oxalic acid for damping varroasis during season. The theoretial part is focused on short summary knowlenge about varroosis including biology of its originator. More attention is pay options of monitoring and damping substance. The practipal part stand on experiment, in which this acid has been applied as required based of values average daily fallen mites, trough dropping and paper towel impregnated by effective substance. The results show the relationship between the total number of fallen mites and the subsequent winterability. This fact was also proved in the calculation of the correlation coefficient, where the mean to strong dependence was found.
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Selekční kritéria k upevnění varroatolerance včely medonosné
Rod, Jan
Main purpose of this thesis is to summarize knowledge in the field of suppressing the varroosis and to compare contemporary methods and chemicals. Then to describe behavioural patterns of varroatolerant bees, their mutual relations and their importance for selection of varroatolerant honey-bee colonies. In the thesis is described relation between varroosis and the viruses of honey bee and a possible consequences of this relation for the honey bee population. Theoretical knowledge is supported by the experiments with the new methods of application of oxalic acid. The object of these experiments was to determine the efficiency of oxalic acid in control of the growth of the Varroa mite and it’s effect on the brood. Then the varroasensitive hygiene of honey bee colonies was tested. The results show that methods for selecting varroatolerant honey bee colonies is still not finished for praxis, therefore, collapses have to be prevented by application of varroacids.
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Varroóza a možnosti jejího tlumení organickými kyselinami
Moravová, Pavlína
The diploma thesis was focused on the possibility to control Varroa destructor in honeybees by using natural varroacides. In the literary section were processed findings about drugs and in the practical part there were described and evaluated the results. During the experiment the effectiveness of formic acid and fluvalinate and effectiveness of oxalic acid and amitraz were compared. Statistical evaluation of results has found that formic acid reached 78,6% efficiency, and oxalic acid on average, 93,8% efficiency, and this efficiency was equal or statistically insignificantly slightly higher compared to synthetic alternatives. Any negative effects of organic acids on the status and development of colonies were observed. Experiment results are particularly important for the treatment of resistant populations of mites and prevent cumulative acaricides residues in bee products.
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Oxalates in rocks and plants
Novotná, Julie ; Hruška, Jakub (referee) ; Jehlička, Jan (advisor)
SUMMARY: The presence of oxalates is widespread not only as kidney stones, but in whole nature. It is well known that oxalates are products of some plants, fungi and lichens. The accumulates of calcium oxalates are increased in: sorrel, rhubarb, spinach, soya, dieffenbachia, etc. Oxalates serve many important functions in plants such as calcium regulation, protection from herbivory and metal detoxification. Aluminum detoxification is ability of plants, which is critical factor for crop production. Breeding of commercially viable low oxalate cultivars or genetic manipulation with crops should deal to enhance of nutritional quality and enhance of agricultural production too. The presentation of oxalates in rocks is well representing by calcium oxalate minerals, whewellite and weddellite. Minerals occur in sediments into precipitated forms within concretions and hydrothermal veins or dispersed form into modern sediments, e.g. peats. Oxalates are biologic products, therefore they can indicate biological activities, so oxalates should be sought for researching on cosmic objects. The observation of oxalates on Earth and interpretation of the Raman spectra is necessary in these types of study.
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Impact of input parameters variation on fabrication of nanoporous alumina
Hriczo, Filip ; Macháčková, Marina (referee) ; Hrdý, Radim (advisor)
This thesis examines and tests acids and conditions, which make the production of nanoporous ceramic at the thin aluminium layer the most effective and provide the highest quality. This paper describes the production of nanoporous structures with pore size 15-400 nm, depending on the electrolyte. Creating a regular hexagonal structure by electrochemical oxidation is dependent on many parameters that affect the regularity of structure and parameters of the ceramics produced. They were investigated primarily by changes in temperature and input voltage. All results were examined by SEM analysis.
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