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Microscopic Fungi in Practical Exercises at Lower Secondary School
Tejmlová, Kristýna ; Pavlasová, Lenka (advisor) ; Skýbová, Jana (referee)
Microscopic fungi (micromycetes) is a topic that is at lower secondary schools neglected and mentioned only marginally. Fungi are of great importance for humans in their everyday life, whether negative or positive. It is the reason to rethink how and when to inform pupils about them. The aim of my thesis is to create my own practical exercises that acquaint the pupils of lower secondary schools with the appearance, properties, occurrence, uses, cultivation methods, and last, but not least with the safety of micromycets. In the practical exercises are used basic methods of work with micromycets such as inoculation of the population from the natural environment to a sterile culture medium, the sedimentation method or the method of spreading a dilute suspension of the stick on the agar medium. The revaccination is used to eliminate secondary structures. Then we deal with the possibility of preparing culture media. Isolated cultures of microscopic fungi are identified by macroscopic characters. Due to the safety with micromycets, I recommend to teach microscopic characteristics in high school. The presented practical exercises were verified at the lower secondary school in Vinařice by pupils of the 6th class. The practical exercises proved to be suitable for pupils in lower secondary school. Securing...
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Effect of inoculation and cooling rate on the DAS for aluminium foundry alloys
Dočekal, Václav ; Blažík, Petr (referee) ; Kaňa, Václav (advisor)
This bachelor thesis deals influence of inoculation and rate of cooling on DAS value. The aim of this thesis is primarily the effect of inoculation and formation of dendrites in aluminium alloy. The second part of thesis describe experiment. In this experimental part, is research effect inoculation of combination Ti and B. The influence of the cooling rate on the DAS value, which has been achieved by various casting processes, has also been researched. These effects, was researched on aluminium alloy-AlSi10Mg(a). The DAS has been found to affect the rate of cooling. Inoculation does not affect this value.
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Influence of modification and inoculation on structure and mechanical properties of aluminium alloys
Janošťák, Jan ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This thesis examines the influence of inoculation and modification on the internal structure and properties of aluminium-silicon alloys. The effect of inoculation by titanium and boron and modification by sodium and strontium is investigated in experimental part of the thesis. All these metallurgical interventions in the melt are tested on three types of hypoeutectic Al-Si alloys (AlSi10Mg(a), AlSi8Cu3, AlSi7Mg0,3). The experiment was carried out in cooperation with the foundry of non-ferrous metals, Aluminium Group, a.s. in Sloup.
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Study of the effect of metallurgical and technological parameters on mechanical properties of aluminium alloys
Pešek, Jakub ; Krahula, Karel (referee) ; Zemčík, Ladislav (advisor)
Sugested thesis has been made with the intent to observe and describe the length of the modifying effect of three different types of modifiers and their effect on the mechanical properties of aluminium alloy. Next step was to process and evaluate links between mechanical properties and chemical composition. Chemical analysis and mechanical properties of cast samples were obtained. For this purpose and a method of metallographic processing was applied afterwards. The grain size was evaluated before and after the heat treatment. Measurements of the secondary dendrite branches and evaluation of the eutectic morphology were made. The hardness was measured on selected samples.
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Production of Ductile Iron with Feritic Matrix
Blaha, Marek ; Šupálek, Milan (referee) ; Molliková, Eva (advisor)
This bachelor thesis deals with the properties and production of ductile cast iron with ferritic matrix. Theoretical part is focused on basic information about ductile iron, its chemistry, structure and mechanical properties. The production of ductile iron with ferritic matrix in JMA Hodonín Ltd is described in the next chapter of this thesis. In the experimental part the real cast is described together with its production technology and material. The practical part is concentrated on comparison of chemical composition, structure and mechanical properties of material of cast and keel blocks made of the same melt. Finally the results of experiments are summarized and the arrangements for improving conformity between material of cast and of keel block are suggested.
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Compacted graphite cast iron
Švábenský, Petr ; Kaňa, Václav (referee) ; Laštovica, Jaroslav (advisor)
This labor search to summarize the known properties and methods of production of compacted graphite iron. The first part describes the structure, chemical composition, properties and uses. The second part focuses on the possibility of production of vermicular cast iron. Inoculation options and treatment and various manufacturing processes.
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Alternative phosphorus nutrition of plants
Mikanová, Olga ; Šimon, Tomáš
The methodology summarizes the basic information on applicability of phosphorus solubilizing bacteria for inoculation of field crops. Specific procedures of isolation, screening, selection and maintaining of bacterial strains are described. The technology of inoculant production, and application techniques are involved. The methodology offers the use of inoculants as an alternative plant nutrition. Results of practical experiments show that P-solubilizing bacteria increase the utilization of phosphorus. Plant growth promoting microorganisms in the inoculant also support the root system and consequently uptake of all nutrients by plants.
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