大气压强下毛竹的水分浸入特性

研究生长于浙江省富阳的毛竹的水分浸入特性.测量试样按生长年龄1～4年4个等级分组,各组试样达到最大的水分浸入量所需浸水时间为140～168 d,试样组生长年龄越大,达到最大水分浸入量所需的时间越长,浸水5周后试样中90%的孔隙被水充满.导出了一个预测毛竹试样最大水分浸入量的公式,其预测的结果与测量结果符合得很好.利用非线形回归的方法得到了关于水分浸入毛竹的经验方程,根据这一经验方程计算了试样的浸入水分比率,4个年龄组试样浸入水分比率计算值与测量值之间颇为吻合.水分从试样表面蒸发将引起试样质量的减少,文章也讨论了该现象对浸入水分质量测量精度的限制.

Characteristics of Water Penetration into Moso Bamboo in Atmospheric Pressure

Investigation was carried out for water penetration into moso bamboo ( Phyllostachys pubescens), grown in Fuyang,Zhejiang Province. Specimens were grouped with age classes of 1 ～ 4 years. The immersion time for maximum water uptake (MWU) ranged from 140 to 168 days. Group with older age took a longer time to get its MWU. About 90% of the voids in specimens were filled with water after the penetration had been executed for five weeks. A formula for MWU was developed and predicted MWU corresponded well to the measured ones. Empirical equation was put forward for water penetration into moso bamboo by polynomial regression. The fraction of water uptake in specimen was calculated from the empirical equation. There was a reasonable agreement between calculated and measured values of the fractions for four age classes of specimens. Discussion was also done concerning it that the accuracy of weighing was limited by the mass decrease caused by water evaporation from specimen surfaces.