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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Analýza morfometrických parametrů tracheid dřeva smrku ztepilého (Picea abies (L.) Karst.) na výzkumné ploše Bílý Kříž a Rájec-Němčice
 Novák, Tomáš
This thesis is about analysis of morphometric parameters of Norway spruce tracheid wood from research areas Bílý Kříž and Rájec–Němčice. Wood for examining was sampled from different heights of trees. Width of the annual ring and percentage of late wood was determined at macroscopic level. Annual ring width ranged from 2,2 to 4,5 mm. The percentage of late wood was found to be 24 %. Microscopic analysis of tracheid wood dimensions followed. Radial size of tracheids was determined and averaged 31 μm. Tracheid cell wall thickness ranged from 2 to 10 μm. The number of tracheids increases with trunk height as does the width of the annual ring. Wood density of sampled wood averaged 450 kg·m-3. The variability of the wood structure by radius and height was examined. Subsequently, the obtained data was compared with precipitation and temperature.
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Influence of Wood Density on Measured Values when Working with a Kučera's Drill
 Černý, Pavel
Diagnostics of wooden structures is still a widely used field in construction. The measured values during testing in wood diagnostics are always influenced by the properties of the wood. One of the most important roles in wood diagnostics is moisture, which affects a wide range of physical and mechanical properties. This was not the case when testing with the Kučera`s drill, which is standardly used for masonry diagnostics. For research purposes, the drill had to be transformed for use on wooden structures. The transformation was performed on the basis of a special reduction.
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