http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Masumi Hasegawa ),( Hiroyuki Okamura ),( Mami Murakawa ),( Kazutoshi Takeuchi ),( Keiichi Yamada ),( Kiyotaka Uchikura ),( Noriyuki Harada ),( Junji Matsumura ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
Some fire-retardant woods with no documented fire performance have occasionally been sold in the market. It is important to know whether the required amount of chemical fire retardant is present in all sections of a wood sample. In this study, nondestructive measurement of chemical retention in fire-retardant treated wood was experimentally investigated using air-coupled ultrasonic and micro focus X-ray computed tomography. Wood samples were impregnated with different chemical concentrations. First, the ultrasonic wave velocities of wood samples were measured before and after impregnation. The percent changes in velocity exhibited a positive correlation with the chemical retention. Second, the images of wood sample were captured using X-ray CT before and after impregnation. The changes in integrated brightness values calculated from the captured images also showed a positive correlation with the chemical retention at a 1% significance level. These findings suggest that it is possible to evaluate the distributions of chemical retention in fire-retardant wood.