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The objective of this study is to preliminarily illustrate the reason of subzero temperature effect on stress wave velocity in green wood. The stress wave velocities in Korean pine standing trees at normal and subzero temperature were respectively measured and compared. Then, the effects of temperature and moisture content on stress wave velocity were studied by measuring the small clear wood samples...
To detect the effects of internal hole-defects location on the propagation parameters of acoustic wave in the wood, forty maple wood samples used as the study objects are tested by using PLG (Portable Lumber Grader) instrument in this paper. The propagation velocity and vibration frequency of acoustic wave in intact wood and defective wood were compared, and then the correlation between the propagation...
Wood is a material that is produced biologically in the growing tree, making it vulnerable to the attack of fungi. This will reduce the quality of wood, especially for log. The 2D image reconstruction contributed greatly for log cross-section defect testing in order to promote the utilization rate of wood resources. At first, this paper studied the stress wave computerized tomography technique, and...
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