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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Vztah vlastností rezonančního dřeva k podmínkám růstu
 Drábek, Ondřej
This work summarizes previously published research on resonant spruce wood. It focuses mainly on the properties of resonant wood to the terms of its growth. The individual values of different authors are compared with each other and summarized into concrete results, so that results could be used to search for potential sites with the possibility of an increase in the resonant layers of wood. To facilitate interpretation and subsequent application there was drawn a map of the potential occurrence of resonant wood in the Czech republic, based on the average annual temperature and rainfall, slope and orientation, optimum altitude and vegetation zones.
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Vliv variability stavby rezonančního dřeva na jeho akustické vlastnosti
 Schwarzer, Martin
This work was the structure of resonant spruce wood devoted to. The tree-ring widths and summer wood measure were measured. By use of non - destructive methods their acoustic properties were measured - speed of sound, acoustic constant, logarithmic decrement of damping, acoustic wave resistance, wood - density and Young's modulus. Data were statistically analyzed and the wood structure coefficient of variation for each specimen was calculated. There were three different methodologies for verification of the wood structure variability effect formulated. Subsequently, it was found that it is possible to determine the effect on the acoustic properties of the wood macroscopic structure variability.
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