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Optimization of tomographic station GE phoenix adjustment for plastic components including metal parts
Starý, Přemysl ; Petrilak, Michal (referee) ; Zikmund, Tomáš (advisor)
X-ray computed tomography is a tool mostly used in a medical diagnosis. A development of the technique and an improvement an in accuracy of tomographic systems enabled an utilization of the tomography in industrial applications. The tomography allows non-destructive analysis of inner structure. There is a negative influence of a reconstructed area if a low-absorption and high-absorption materials are scanned together. This influence makes analysis of the inner structure impossible. There are two options to eliminate these artifacts. We can use algorithms to reduce metal artifacts, or we can try to avoid them when performing the scan. This bachelor thesis focuses on an optimization of tomographic station adjustment for the plastic components including metal parts. The effect of an usage of X-ray filter or collimator and effect of a sample orientation on data quality will be observed. We use tools like contrast, noise and edge sharpness to evaluate data quality.
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A comparison of teachers' attitudes towards qualitative and quantitative assessment before and after the Covid-19 pandemic
Výborná, Andrea ; Laufková, Veronika (advisor) ; Novotná, Kateřina (referee)
The aim of the diploma thesis is to analyze a sample of 46 Czech first-grade pedagogues, whether there was a change in their perspective on verbal assessment after distance learning due to the Covid-19 pandemic. This work is divided into two parts. The introductory part of the first, theoretical part contains information from scientific publications regarding the concept of assessment in general, its functions, its types and forms. In the next part, the theoretical part deals with quantitative and qualitative assessment with an emphasis on their influence on the student's motivation. In the second, practical part, I compared the results of 2 researches carried out by me in the form of a questionnaire. One was implemented in 2020 and the second, enriched with 2 update questions, was implemented in 2023 on the same sample of respondents. The conclusion of the thesis contains the answer to the question posed at the beginning of my diploma thesis. From the data collected from my 46 respondents, it appears that educators' views on verbal assessment did not change significantly after distance learning during the Covid-19 pandemic, although there was a slightly more positive perception of verbal assessment.
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Potenciál hodnotové produkce habru obecného v porostech ve stadiu převodu na les trvale tvořivý na ŠLP Křtiny (l.ú. Soběšice)
Vincour, Matěj
The aim of this thesis is to find out the potential of the value production of the European Hornbeam (Carpinus betulus L.). Namely in the stage of the transferring into forest that is permanently producing, at ŠLP Křtiny. Two young stands of European Hornbeam (Carpinus betulus L.), created by the natural renewal after the clear felling were found at the area Soběšice. Further, one adult stand with regeneration under the stand, was found. By the stands created by the natural renewal, educational intervention was undertaken. Target trees, which were then released according to the option of intervention, were found. In total, 122 target subjects were marked. Before the beginning of the growing season, in January 2018 the measuring of the diameter of standing trees from the ground with a dendrometry and then the mining were made. Analysing of the quality of these trees was made according to Schädelin classification. The statistical analysis proved the static significant differences of the thickness increment according to individual options of the intervention. By the altitude increment and the percentage of the live treetop was not proved. For the more precise conclusion of the influence of the different kind of intervention, longer period of time would be necessary. By the adult stand, with the appearing of the renewal in the undergrowth, comprehensive forest inventory of rejuvenation was made and commenced the plot. The part of the errand was also the finding of future potential subjects of the European Hornbeam (Carpinus betulus L.) and its qualitative evaluation.
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Optimization of tomographic station GE phoenix adjustment for plastic components including metal parts
Starý, Přemysl ; Petrilak, Michal (referee) ; Zikmund, Tomáš (advisor)
X-ray computed tomography is a tool mostly used in a medical diagnosis. A development of the technique and an improvement an in accuracy of tomographic systems enabled an utilization of the tomography in industrial applications. The tomography allows non-destructive analysis of inner structure. There is a negative influence of a reconstructed area if a low-absorption and high-absorption materials are scanned together. This influence makes analysis of the inner structure impossible. There are two options to eliminate these artifacts. We can use algorithms to reduce metal artifacts, or we can try to avoid them when performing the scan. This bachelor thesis focuses on an optimization of tomographic station adjustment for the plastic components including metal parts. The effect of an usage of X-ray filter or collimator and effect of a sample orientation on data quality will be observed. We use tools like contrast, noise and edge sharpness to evaluate data quality.
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