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Ink formulation for chemical labels printing
Martiniaková, Ivana ; Krystyník,, Pavel (referee) ; Veselý, Michal (advisor)
This diploma theses is about the study of the effect of individual components of printing compositions intended for material printing of identificaton codes, read by X-ray fluorescence. Two printing technologies were used – screen printing and pad printing. The composition of the print compositions has been optimized in term of visual recognition, print repeatability, a dry matter content providing an X-ray fluorescence signal, as well as optimization of the material print process leading to the creation of invisible identification tags for archive documents.
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The optimization of quarried limestone analysis and usage.
Sidelnicov, Vitalii ; Bednárek, Jan (referee) ; Šiler, Pavel (advisor)
Limestones are rocks formed predominantly from the mineral calcite. The Czech Republic is quite rich in this type of rock. Limestone may have a very diverse composition, properties and uses. For this reason, it is beneficial to study and analyze this material, to better utilize it to its full potential. This bachelor thesis deals with the possible uses of limestone from Lesní lom in Líšna in the city of Brno, which consists of two limestones - Hádsko-Ričský and Vilemovický. Limestone analyses were performed using by the following analytical methods: XRF, XRD and ICP-OES. Furthermore, the thesis deals with the preparation of samples for individual analytical methods and the differences of the results obtained by individual methods. Part of the thesis is also an overview of the possible uses of analysed limestones.
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Spectral analysis of chemical code
Šimončičová, Monika ; Ďurovič, Michal (referee) ; Veselý, Michal (advisor)
The diploma thesis deals with the study of the process of grinding aggregates of particles of a mixture of powdered lanthanide oxides in the dowanol solvent. The formed dispersions were characterised and used for the preparation of printing inks and subsequently for the printing of labels with chemical codes readable by XRF spectrometry. The aim was to study the milling process, to verify the reliability of reading and recognition of marks with the appropriate codes and to monitor the influence of the additive of the up-conversion powder on the resulting relative intensities of the elements in the chemical code. The statistical significance of the differences in the averages of relative intensities was assessed based on the Student's t test.
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Optimization of chemical code printing with XRF identification
Uher, Tadeáš ; Ďurovič, Michal (referee) ; Veselý, Michal (advisor)
The Master’s thesis deals with study printing and optimization of a chemical labels with a code readable by XRF technique. The study is focusing on the identifiability of components in chemical code through data analysis in the Origin program environment and reproducibility of the analysis. The responses of the XRF signal on real samples of historical documents were studied and possible interfering elements were identified. Based on these analyses, a recommendation was formulated for the method of evaluating the obtained data, code analysis and also for the composition of the printing formulation.
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The study of zinc influence on Portland cement hydration.
Ptáček, Martin ; Janča, Martin (referee) ; Šiler, Pavel (advisor)
The topic of this work is the monitoring of the effect of zinc on the hydration process in Portland mixed cement (specifically with the addition of finely ground granulated blast-furnace slag, high temperature fly ash and fluidized bed combustion filter ash). How much zinc and at what time it remains in the pore solution during hydration. Activation energy of a mixture of cement with zinc in the form of soluble salts (Zn(NO3)2.6H2O and ZnCl2) and insoluble oxide (ZnO) by isothermal calorimetry was also investigated. The XRF method has shown composition during hydration. The zinc retardation effect was investigated by isothermal calorimetry and activation energy was calculated using this method. The XRF and ICP-OES methods were used to measure the zinc content of the pore solution. And the amount of portlandite was monitored by the DTA and XRF method.
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Elemental analysis of vehical glass using neutron activation analysis and X-ray fluorescence analysis
Kameník, Jan ; Fikrle, Marek ; Kučera, Jan
Glass microfragments provide valuable information about certain vehicle crimes. The methodology describes application of X-ray fluorescence analysis (XRF) and neutron activation analysis (NAA) of elemental admixtures in vehicle glass fragments. XRF allows rapid and non-destructive test of the sample and helps in selection of protocols for detailed inspections by additional methods. NAA is time demanding, however, has potential to provide robust results for law enforcement agencies. Both methods are described together with protocols of analysis and their variants. The methodology includes results for 80+ vehicle glass samples.
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Spectral analysis of chemical code
Šimončičová, Monika ; Ďurovič, Michal (referee) ; Veselý, Michal (advisor)
The diploma thesis deals with the study of the process of grinding aggregates of particles of a mixture of powdered lanthanide oxides in the dowanol solvent. The formed dispersions were characterised and used for the preparation of printing inks and subsequently for the printing of labels with chemical codes readable by XRF spectrometry. The aim was to study the milling process, to verify the reliability of reading and recognition of marks with the appropriate codes and to monitor the influence of the additive of the up-conversion powder on the resulting relative intensities of the elements in the chemical code. The statistical significance of the differences in the averages of relative intensities was assessed based on the Student's t test.
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Optimization of chemical code printing with XRF identification
Uher, Tadeáš ; Ďurovič, Michal (referee) ; Veselý, Michal (advisor)
The Master’s thesis deals with study printing and optimization of a chemical labels with a code readable by XRF technique. The study is focusing on the identifiability of components in chemical code through data analysis in the Origin program environment and reproducibility of the analysis. The responses of the XRF signal on real samples of historical documents were studied and possible interfering elements were identified. Based on these analyses, a recommendation was formulated for the method of evaluating the obtained data, code analysis and also for the composition of the printing formulation.
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Geochemická charakteristika půdního prostředí se zaměřením na kontaminaci lesních půd podél vybraných silničních komunikací
Petr, Jan
There was investigation of elemental composition through XRF analysis. Seventeen samples were collected from around Vír and Brno dam. Samples were taken from sites with emphasis on the difference in traffic density. After analyzing the samples three of the eleven risk elements were found, including arsenic (As), lead (Pb) and zinc (Zn). Contamination level was compared with limits given by Czech Ministry of the Environment. Two samples showed increased limits in contamination, arsenic (As) and zinc (Zn). However, after statistical investigation there was not discovered a link between traffic volume and increased concentration of risk elements in the soil.
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