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National Repository of Grey Literature 14 records found  previous11 - 14  jump to record: Search took 0.00 seconds. 
Vliv asymetrie kořenového systému na odolnost vůči vyvrácení
 Pekárek, Vladimír
This thesis deals with the stability of trees depending on the symmetry or asymmetry of the root system, collecting data using, tensile tests and procesing of data. It also works with the capabilities to deal with the asymmetry of the root system of conifers and deciduous trees using their adaptation growth. And describes the basic factors in urbanized environment acts on the root system. In the end of this thesis was proved by outcomes, that even very big asymetry of the tree doesn't have to have relevant effect on the tree stability
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The use of ultrasonic testing in construction
 Sztulová, Petra ; Komárková, Tereza (referee) ; Láník, Jaromír (advisor)
The thesis is divided into two parts. The first part is focused on the use of ultrasonic methods in building practice. Explains here how ultrasound works. The second part focuses on the possibility of anchoring. It describes what is chemical, mechanical anchoring. It deals with the tensile testing additionally mounted chemical anchors Hilti. Primarily focuses on what happens if it fails to comply with the correct technological procedure when installing chemical anchors.
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Probabilistic model for textile concrete reinforcement and comparison with experiments
 Lomič, Jiří ; Rypl, Rostislav (referee) ; Vořechovský, Miroslav (advisor)
The scope of the presented bachelor’s thesis was the establishment of a probabilistic model for material strength of textile reinforcement used for textile reinforced concrete. This reinforcement is composed of AR-glass multi-filament yarns. The goal of this thesis was to determine the potential weak spot of the textile yarn and evaluate its strength in overall. The weak spot could have been a lateral cross-connection, which narrowed the textile yarn at several locations. Another thing of interest was the observation of statistical size effect with the increasing length of textile yarn. In order to properly fit the numerical model to real behavior of multi-filament yarns, five series of experimental tensile testing has been executed in laboratory. Each series consisted of 8-10 specimens and had a different yarn length. Maximum tensile force and maximum deformation have been measured to obtain L-D diagrams for each specimen. Measured data were statistically analyzed and gave the information necessary for the identification of probabilistic model parameters. This parameter estimation has been carried out with the help of numerical and optimization methods included in Python programming algorithms. The problem statement resulted in a combination of model parameters describing the textile yarn behavior. The statistical size effect was observed corresponding to the Weibull theory. The performed study showed that the failure of the textile yarn depends on material strength of its filaments. There are no load concentrators at the location of lateral cross-connections affecting the yarn failure.
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Možnosti využití dat z digitální sítě traktoru při tahových zkouškách
 Jícha, Marcel
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