National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
Effect of the exothermic mixture humidity on the metal solidification in the feeders
Hejduk, Stanislav ; Krutiš, Vladimír (referee) ; Záděra, Antonín (advisor)
The work deals with research activities in the field of casting and also the nature and principle of exothermic castings. Furthermore, an experiment was designed to investigate the effects of moisture on the exothermic mixture and its settling ability. For the experiment, risers with different degrees of humidity formed into bentonite molds were used. Furthermore, the solidification curves obtained during the melt in the riser and the shrinkage which were formed in the riser were evaluated.
Robotic welding case of linear fluid motor produced from high-strength steel
Hejduk, Stanislav ; Slováček, Marek (referee) ; Sigmund, Marian (advisor)
The theses deals with the welding of high-strength steels S690 QL using the MAG method. The aim of the work was to conduct a feasibility study for welding VP steels. Welding took place in a robotic workplace. Welding parameters were calculated, and subsequently, a pWPS was created based on these parameters, according to which a test sample was welded. The welding was performed without preheating or post-weld heat treatment. The welded samples were then evaluated using non-destructive and destructive testing. No unacceptable surface defects were detected through non-destructive testing. Destructive testing verified the size of the heat-affected zone (HAZ), with the most significant influence observed in the cover layer, and a value of 2.5 mm was determined. The hardness test according to Vickers also yielded successful results, with the highest measured value being 377 HV0.2. The tensile test resulted in failure within the HAZ, but the mechanical properties were comparable to the base material. Therefore, the weld on the test sample was evaluated as successful.
Effect of the exothermic mixture humidity on the metal solidification in the feeders
Hejduk, Stanislav ; Krutiš, Vladimír (referee) ; Záděra, Antonín (advisor)
The work deals with research activities in the field of casting and also the nature and principle of exothermic castings. Furthermore, an experiment was designed to investigate the effects of moisture on the exothermic mixture and its settling ability. For the experiment, risers with different degrees of humidity formed into bentonite molds were used. Furthermore, the solidification curves obtained during the melt in the riser and the shrinkage which were formed in the riser were evaluated.
Pastva jako prostředek údržby trvalých travních porostů v CHKO
Mendelova zemědělská a lesnická univerzita v Brně, Agronomická fakulta, Ústav pícninářství, Brno ; Univerzita Palackého v Olomouci, Přírodovědecká fakulta, Katedra botaniky, Olomouc ; Ústav půdní biologie AV ČR, České Budějovice ; ZO ČSOP Bílé Karpaty, Veselí nad Moravou ; Kalčík, Jiří ; Hejduk, Stanislav ; Tajovský, Karel ; Mládek, Jan
Cílem projektu je zpracování dlouhodobé koncepce pastvy v CHKO Bílé Karpaty, která by z ekonomického hlediska byla pro zemědělské subjekty a vlastníky pozemků přijatelná a současně udržela společenstva rostlin a živočichů, vázaných svým výskytem na trvalé travní porosty, v optimálním stavu z hlediska preferencí ochrany přírody. Pro výzkumné účely bylo na území CHKO Bílé Karpaty vybráno devět lokalit, kde je studován vliv pastevního hospodaření na společenstva po botanické, zoologické a zemědělské stránce. Na každé lokalitě (kromě lokalita Hribovna - nepárová) probíhá komplexní monitoring na pasené i kosené variantě travního porostu. Některé části výzkumu jsou omezeny pouze na tři hlavní lokality: lok. Suchov, lok. Lopeník a lok. Brumov. Výjimečně probíhají terénní sledování i na jiných lokalitách, jejich bližší specifikace je pak uvedena v daném příspěvku.

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