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Specifics of assessment of old concrete structures
Mička, Michal ; Žítt, Petr (referee) ; Cikrle, Petr (advisor)
The bachelor thesis deals with evaluation of properties materials concrete structures of former textile factory Vlněna from the 19th century in Brno. The content of this work is divided into the theoretical and practical part. The theoretical part deals with the description of the methods used in the research of reinforced concrete structures, comparison of the types of beams used in the past with used today and unlike the principles of the design of reinforced concrete structures in the 1920s and 30s of the 20th century compared to the present time. There are also described components, properties and technologies of concrete production in the period between the war and the comparison with the present time. The practical part consists of on-site examinations and sampling. A large part consists of the evaluation of laboratory tests on the test samples taken from the solved part. A total of 24 test samples were performed. It also compares the strength of the concrete reinforcement with the reinforcement used today.
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Evaluation of supplementary plant preparation application effect on potato production parameters
MIČKA, Michal
The aim of the master's thesis was to evaluate the effects of the application of an auxiliary product on the production parameters of potatoes. For this purpose, a one-year small-plot experiment was established in 2022 at the experimental field in Lukavec. The varieties Ornella, Red Anna, Val Blue, and Westamyl were selected for the experiment. For this experiment, the auxiliary product Energen Fulhum Plus was applied. Energen Fulhum Plus is a modified aqueous solution of substance salts obtained by the original decomposition of technical lignosulfonate. It supports the formation of fine root hairs and, as a result, increases the use of moisture and nutrition. It also supports growth, yield, and material composition. After the harvest of the experimental plots, the yield was determined and then samples were taken for chemical analyses. From the experiment, the tuber yield, average tuber weight, starch content, starch yield, dry matter content, nitrogen content, nitrogen yield, and polyphenol content were evaluated. In the monitored year 2022, the temperature and precipitation during the period March - September were above average and it is evident from the results that all the varieties increased the tuber yield (t/ha), average tuber weight (g), starch content (%), starch yield (t/ha), nitrogen content (%) and nitrogen yield (t/ha) compared to the control after the application of the auxiliary product Energen Fulhum Plus. As for the dry matter content (%) after the application of the auxiliary product, the dry matter content increased in all varieties except the Val Blue variety, which showed a slight decrease in dry matter content. The application of the auxiliary preparation had different results for the total content of polyphenols (mg EGA/g dry matter), it increased in the varieties Westamyl and Val Blue and, on the contrary, decreased in the varieties Ornella and Red Anna.
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Starch and protein yield in potatoes for starch production
MIČKA, Michal
The aim of this thesis was to evaluate the starch and protien content in selected potato variarients in relation to nitrogen fertilization. The literature review is a general introduction to the given problem. In the year 2018, a one-year field trial was established where three starch yield varieties Anatori, Hermes a Ornella were observed. Nitrogen fertilizer was applied in two variants. The first variant was fertilized in the spring before planting with a dose of 73 kg N/ha, the second with a dose of 111 kg N/ha.In the experiment, tuber yield, average tuber weight, starch content, starch yield, dry matter content, and crude protein yield were evaluated. In the monitored year of 2018, which had above-average temperatures and on the contrary lowerprecipitation, the best evaluation was the application of higher nitrogen fertilizerswitha dose of 111 kg N/ha. Higher application of nitrogen fertilizers compared to lower dose increased potato tuber yield (t/ha), starch (%) and starch yield (t/ha).
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Specifics of assessment of old concrete structures
Mička, Michal ; Žítt, Petr (referee) ; Cikrle, Petr (advisor)
The bachelor thesis deals with evaluation of properties materials concrete structures of former textile factory Vlněna from the 19th century in Brno. The content of this work is divided into the theoretical and practical part. The theoretical part deals with the description of the methods used in the research of reinforced concrete structures, comparison of the types of beams used in the past with used today and unlike the principles of the design of reinforced concrete structures in the 1920s and 30s of the 20th century compared to the present time. There are also described components, properties and technologies of concrete production in the period between the war and the comparison with the present time. The practical part consists of on-site examinations and sampling. A large part consists of the evaluation of laboratory tests on the test samples taken from the solved part. A total of 24 test samples were performed. It also compares the strength of the concrete reinforcement with the reinforcement used today.
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Assesment of parameters for viscoelastic material using programme ANSYS from nanoindentation
Micka, Michal
Nanoindentation makes it possible to investigate mechanical properties of material in dependencies on penetration of the indenter also on small amounts of sample. From time course of the indenter penetration it is possible using standard procedures of the computer programme ANSYS to determine coefficients of Prony series for description of the viscoelastic material. Article presents model for simulation of the nanoindentation test in ANSYS and methodics for determination of material constants.
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Railway embankment reinforced by geogrid
Micka, Michal
Numerical study using the programme ANSYS deals with the generation of the numerical model and with the examination of the influence of the geosynthetic grid on the carrying - capacity and deformation of the simple railway's embankment on the less load-bearing subsoil. The stiffening grid is located on the separation of the embankment and the subsoil. The grid effect on the behaviour of the soil construction with the different height of layers is studied.
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