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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Vyhodnocení možnosti detekce dutiny poklepem
 Hemza, Jiří
The thesis deals with the possibility of utilization and sensitivity of the trunk examination by tapping in assessing the defects affecting the stability of the trees. A dendrological survey was conducted in the area of interest and then there were trees selected to assess the presence and extent of the cavity by tapping. The tapping using a small mallet was done on selected trees at the certain level. The tapping was subjectively evaluated by listening. The sound of tapping was recorded using the microphone and the recorded sound was further analyzed. At the same levels like tapping there was used the ArborSonic 3D Acoustic Tomograph to determine the extent of the cavities in the trunk of selected trees. The same extent of observation was also performed on a sample of a trunk with and without cavity in laboratory conditions. The values obtained were compared with each other for the purpose of verifying usability by tapping using a small mallet while assessing the trees to determine the presence of the cavity and its extent.
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Posouzení možnosti identifikace hnilob kmene s užitím termokamery
 Fiala, Michael
This study is focused to possibilities of using thermography in tree assessment in urban greenery. It was took 628 infrared images of 43 trees. On these trees was determine the extent of damage and decayed wood and cavities. It was also acquired 555 photos in visible spectrum for comparison. For the verification of heat transfer in a tree trunk and bark were made the measurements of temperature development in different depths of trunk with using a thermocouple thermometer. In one case was measured the sap flow. It is not possible recommended infrared cameras as a helpful tool for determining cavities and decayed wood in trees. Interpretation of results obtained from infrared imaginings is difficult and its doesn't show anything more than direct observation in the field. Moreover some of visible defect weren't detected by thermography. Application of infrared cameras can be helpful for evaluation of presence the other organisms dependent on a tree cavity.
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