【摘要】 木材—吸附水系是一个多重弛豫时间的介电体系。木材—吸附水系的介电弛豫时间分布机构是:因水分子同木材之间形成的氢键结合能呈某种分布所致。本文应用Fr（?）hlich理论,得到了描述木材—吸附水系的介电弛豫时间分布参数v₀/kT、弛豫时间τ的值域和含水率W之间关系。计算了该系统的复介电常数和频率间变化关系,并同实测值做了比较。结果如下:①分布参数v₀/kT随着含水率W的增加而减小,这表明势垒H的宽度分布愈来愈窄;②介电损耗峰值ε″_m的计算值和实测值十分吻合;③介电常数ε′的计算值和实测值一致,但,在高频域内介电损耗ε″的计算值和实测值稍有偏离。更多还原

【Abstract】 The wood-absorptive water is a multi dielectric relaxation time system. The distribution mechanism of dielectric relaxation time in such system deponds mainly on the va- riation of the energy of the hydrogen bonds between water molecules and wood. The relaxation parameter v₀ / KT of describing a relaxation process and the value domain of relaxation time τ₀ with respect to the moisture content were obtained in the system. The complex dielectric constant ε_* was calculated with respect to the factor frequency: The calculated values and the measured values were compared.The conclusions are as thc followings.（1） The value of v₀/KT decreased as the moisture content φ increased.（2） The calculated peak value of loss factor ε″_m was consist with that of measured.（3） The calculated value of dielectric constant ε′ was consist with that of measured. However, there were small deviations between the calculated values and the measured values in the range of high frequencies.更多还原