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Study of fracture toughness and wear resistance of thin MoBC coating under dynamic conditions
Buršíková, V. ; Grossman, Jan ; Fořt, Tomáš ; Souček, P. ; Zábranský, L. ; Buršík, Jiří ; Vašina, P. ; Dupák, Libor ; Sobota, Jaroslav
The aim of the present work was to study the mechanical properties of thin amorphous MoBC coatings and MoBC coatings consisting of nanocrystalline Mo2BC embedded in amorphous MoBC matrix. The hardness of the amorphous MoBC coatings (20 GPa) is comparable with the common amorphous diamond-like carbon coatings, however their elastic modulus as well as fracture toughness and ductility are significantly higher. Magnetron sputtering of three targets, B4C, C and Mo, for MoBC was used for coatings preparation. The aim of this work was to study the mechanical and tribological properties of MoBC coatings deposited on high speed steel substrate. The classification of MoBC coatings was performed using an impact tester in a dynamic mode and enabled us to predict the limit load causing the coating destruction.
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Possibilities of the usage of nonconventional methods and dietary supplements in prevention and in health provision of calves.
ZÁBRANSKÝ, Luboš
It is important to take care of calves and their health for good results in beef-raising. The aim of the work was to evaluate the effect of dietary supplements Lactovita and Biopolym on the frequency of diarrhoea occurrence in calves in the first stages of the period after weaning for milk nutrition. The experiment was conducted in farmers' cooperation Staré Hobzí, where Holstein Cattle are bred. Two groups of calves were made ? control and experimental group. In an experimental group dietary supplements to support active immunity were served according to the guideline. In case of diarrhoea occurrence the calves from experimental group were cured in the same way as the calves from control group. The occurrence of disorders during the period of experiment, method and length of treatment were recorded. Recorded data were summarised and statistically evaluated. The calves were examined from 29th February to 20th December. The results proved positive effect of dietary supplements Lactovita and Biopolym, but these results were statistifically insignificant. It is assumed that in case of studying bigger groups the proof of statistical significance will be more probable.
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Possibilities of the usage of nonconventional methods and dietary supplements in prevention and in health provision of calves
ZÁBRANSKÝ, Luboš
It is important to take care of calves and their health for good results in beef-raising. The aim of the work was to evaluate the effect of dietary supplements Lactovita and Biopolym on the frequency of diarrhoea occurrence in calves in the first stages of the period after weaning for milk nutrition. The experiment was conducted in farmers' cooperation Staré Hobzí, where Holstein Cattle are bred. Two groups of calves were made {--} control and experimental group. In an experimental group dietary supplements to support active immunity were served according to the guideline. In case of diarrhoea occurrence the calves from experimental group were cured in the same way as the calves from control group. The occurrence of disorders during the period of experiment, method and length of treatment were recorded. Recorded data were summarised and statistically evaluated. The calves were examined from 29th February to 20th December. The results proved positive effect of dietary supplements Lactovita and Biopolym, but these results were statistifically insignificant. It is assumed that in case of studying bigger groups the proof of statistical significance will be more probable.
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