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Parametrická studie protlačovacích zkoušek na miniaturních discích při podmínkách konstantní rychlosti zatěžování
Dymáček, Petr
The mechanical testing and numerical modeling of the small punch test on miniature disks from heat resistant steel type ČSN 41 5313 were performed. Current intensive methodical and application analysis of the possibilities of these tests is aimed mainly on relation between their results and conventional test results on massive specimens. One of the ways is empirical deduction of these relations another one is the numerical modeling. Finite element method offers good tool for creation of parametric model capable to simulate the process during the test and study the influence of geometrical and material characteristics on the test results. The experimental and calculated results mentioned in the paper are for punch testing at constant deflection rate at room temperature as well as operational temperature of the material.
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The Tolerance of Selected Species Fish Eggs to the Antifungal Baths
RAŠKA, Karel
The antifungal detergents Jodisol and Aquahum were tested on the fish eggs of the common carp (Cyprinus carpio), the sheatfish (Silurus glanis), the tench (Tinca tinca) and the common barbel (Barbus barbus). On the fish eggs of the African sharptooth catfish (Clarias gariepinus) the detergents Aquahum and Primrose were tested. The fish eggs from artificial spawn were used for the experiments. These experiments were running under laboratory conditions. The bath length was 5 minutes. The fish eggs incubation proceeded on laboratory dish at average water temperature, which was for the carp 22.87 ? 1.38 (min. 20.5; max. 23.8) °C, for the sheatfish 24.03 ? 2.12 (min. 20.4; max. 25.5) °C, for the tench 20.40 ? 2.13 (min. 18.0; max. 22.5) °C, for the common barbel 16.8 ? 0.95 (min. 14.5; max. 18) °C, and for the African sharptooth catfish 22.50 ? 0.35 (min. 22.0; max. 23.0) °C. Using Jodisol the best hatching success for the common carp was achieved when the concentration was 1 ? 10 ml?l-1, for the sheatfish 1 ml?l-1, for the tench 20 ml?l-1, and for the common barbel 50 ml?l-1. Using Aquahum the best hatching success for the common carp was achieved when the concentration was 1 ml?l-1, for the sheatfish 0.1 ml?l-1, for the tench 2 ml?l-1, and for the common barbel 0.1 and 2 ml?l-1. The stable preparation Aquahum with concentration 0.05 ml?l-1 proved the best results for the sheatfish. The preparation Primrose used for the African sharptooth catfish proved the best results with concentration 0.0033 and 0.01 ml?l-1. The detergent Aquahum could be recommended for the baths of the common barbel and the common carp. Jodisol worked well for the tench and the sheatfish. The best detergent for the African sharptooth catfish was Primrose.
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Households with children in the achieving society conditions. Selected economic psychological aspects of household
Čapek, Jan ; Riegel, Karel (advisor) ; Šubrt, Jiří (referee) ; Bedrnová, Eva (referee)
Count of inhabitants in European countries is decreasing. I focussed primarily what does influence young people in their decision to have children, what is the difference in perception of the life requirements of the performance oriented society between households with children and households without children. The basic tested hypothesis is the statement, that most of young people consider children as a factor reducing their standard of living. I created model of factors influenced the decision according the studying of recent researches. The factors are divided into four areas - values, compatibility of partners, state support and economic conditions. I tried to find the level of influence of these factors in the three related researches. The first research enquired after the performance oriented society requirements by the households with children and households without children. The results are based on representative sample of younger 40 years old respondent questionnaire answers. The second research tried to find the concrete strategies, how to cope with performance oriented society requirements by households with children and households without children on representative sample questionnaire with open question: "What does help you to cope with recent society requirements?" In the third research I...
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