1988 Fiscal Year Final Research Report Summary

Analysis of periodical structures of woods

Research Project

Project/Area Number	61304024
Research Category	Grant-in-Aid for Co-operative Research (A)
Allocation Type	Single-year Grants
Research Field	林産学
Research Institution	Kyoto University
Principal Investigator	HARADA Hiroshi Kyoto University, Professor emeritus, 名誉教授 (30026497)
Co-Investigator(Kenkyū-buntansha)	OKANO Takeshi University of Tokyo, Professor, 農学部, 教授 (30011927) FUKAZAWA Kazumi Hokkaido University, Professor, 農学部, 教授 (40001408) NORIMOTO Misato Kyoto University, Associate professor, 木材研究所, 助教授 (20027163) FUJITA Minoru Kyoto University, Associate professor, 農学部, 助教授 (60026599) SAIKI Hiroshi Kyoto University, Professor, 農学部, 教授 (40026498)
Project Period (FY)	1986 – 1988
Keywords	wood structure / periodical distribution of wood cells / Fourier transformation / wood property / anisotropy of wood structure / 木材の視覚特性 / 木材の誘電特性
Research Abstract	In the new idea that "Woods is the assembly of various periodical structures from macro- to micro-levels and the wood property is affected by the periodicity", following subjects; environmental factors for wood production and the occurrence of periodicities; anisotropical periodicities on the arrangement of cells and tissues; the periodical distribution of main cell wall componemts; dielectric, acoustic and visual characteristics affecting wood properties, were examined and attmpted to be related with one another. The method for the analysis of periodicities was mainly performed by the fourier transformation . As the results, anisotropic periodicities of trancheid and vassel distributions on the transverese section, of ray distribution on the tangential section and the three-dimensional shapes and arrangements of fibers could be caught and were related to some wood properties. Cellulose microfibrils are suggested to be orientating periodically on their cross direction and lignin may be changed in its chemical structure during the depositing season in a year.