| Project/Area Number |
62490019
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Nara National College of Technology |
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Principal Investigator |
PROF. ISHIGAKI Akira Dept. of Chem. Eng., Nara National College of Technology, 化学工学科, 教授 (30043467)
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| Co-Investigator(Kenkyū-buntansha) |
ASSISTANT Prof. KAWAGOE Dept. of Chem. Eng., Nara National College of Technology, 化学工学科, 助教授 (90043489)
PROF. UEDA Katsuhiko Dept. of Information Eng., Nara National College of Technology, 情報工学科, 教授 (30043459)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥8,800,000 (Direct Cost: ¥8,800,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | Ultrasound echograhpy / Image processing / Wooden cultural property / PEG impregnation process / Conservation of waterlogged wood / Mass transfer in waterlogged wood / 保存科学 / 水浸出土木材 / 非破壊検査 / コンピュータ画像処理 / 物質移動 |
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| Research Abstract |
In this project we investigated for two subjects.
The one is concerned with non-destructive investigation on the waterlogged archaeological woods by ultrasound echography, which is generally used in medical fields. Applying the method of computer-aidimage processing and wood chemistry.
Another one is concerned with theoretical investigation on the PEG inpregantion process of waterlogged woods applying the method of chemical engineering technology.
1) Investigation on the waterlogged archaeological woods by image processing of ultrasound echography. In this subject we succeed non-destructive observation on the inner structures of waterlogged woods. i.e. The distribution of chemical components (lignin and hemicellulose). Identification of innner cracks (those length and direction) and observation of cross sectional view of innner holes and reverse faces. These results gave us valuable information to estimate innner structures of waterlogged woods to improve conservation method of waterlogged wooden cultural property. Further. we tried to detect waterlogged wood sinkng under ground, then obtained characteristic ultrasound echoe of these waterlpgged woods even almost sinked in the soft clayish ground. 2) Theoretical investigation on the PEG inpregnation process of waterlogged woods. In this subject we succeed to solve the three dimensional diffusion equation of PEG on the impregnation process. Then. the concentration profile of PEG in the waterlogged wooden blocks was displayed graphically by computer-aid simulation. And the relative times to replace 99% water to PEG solution were calculated on the different type of blocks made up by same wood.i.e. plates, cubic blocks, cylimdrical blocks, pipes and others. These results gave us valuable suggestion to estimate the end point of PEG inpregnation process.
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