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Non-destructive survey on the internal hardness of waterlogged archeological woods and its application to conservation of the waterlogged woods.

浸水考古木材内部硬度无损测量及其在浸水木材保护中的应用

基本信息

批准号：
02559014
负责人：
ISHIGAKI Akira
金额：
$ 1.92万
依托单位：
Nara National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

This research is concerned with following three subjects for conservation of waterlogged wooden cultural property.1) Non-destructive investigations on the waterlogged woods by ultrasound echography : In this subject we tried to estimate degree of relative hardness distributed in the cross section of the any particular parts of those woods by image processing of ultrasound echograms. Further we found the most troublesome parts, which shrinked abnormally in the PEG impregnation process, revealed remarkable heterogeneous ultrasound echoes. These results give us useful informations for conservation of waterlogged wooden objects.2) Investigations on the conservation of waterlogged woods applying theoretical treatment of mass transer : In this subject we investigated the influences of wood species, PEG concentration and temperature on impregnation rate of waterlogged woods. And we estimated difference of the PEG impregnation rates for three dimensions, such as radial, tandential and axial rate. Further we investigated by theoretical treatments on the rate of air drying for watelogged woods.3) Investigations on the resident microorganisms in the waterlogged woods : In this subject we found remarkable difference of resident microorganisms between two type of wood species. In the waterlogged wood of Cryptomeria japonica D.Don, we found mainly gram negative microorganisms, however, in the Aesculus turbinata Bl, found several species of microorganisms beside gram negative one in spite of these two type of wood blocks had been immersed for long term in a same water vessel.

本研究主要探讨以下三个课题：1）超音波此外，我们发现最麻烦的部分，在PEG浸渍过程中异常收缩，显示出显着的不均匀超声回波。这些结果为木材浸水保存提供了有益的信息。2）应用质量传递理论研究木材浸水保存：本课题研究了木材种类、PEG浓度和温度对浸水木材浸渍率的影响。并估计了径向、纵向和轴向三个方向上PEG浸渍率的差异。3）水曲柳木材中常驻微生物的研究：本课题中，我们发现两种木材中的常驻微生物存在着显著的差异。在柳杉浸水材中，主要发现革兰氏阴性菌，而在七叶树中，尽管这两种木材在同一容器中长期浸泡，但除革兰氏阴性菌外，还发现了几种微生物。