Dielectric properties of wood and hardboard: variation with temperature, frequency, moisture content, and grain orientation
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1G FREQUENCY 1OOK 1M 1OM 50M lOOM 1G activation energy atomic bridge capacitor cellulose molecules constant and loss constant of Douglas-fir constant of wood crystallites curves data symbol desiccator dielectric constant dielectric properties discontinuity dissipation factor dry ice electric field electrically conducting field parallel figure 17 fixed dipole freezing temperature frequencies and humidities grain direction half-power points hardboard type Hewlett-Packard HZ Figure increasing frequency influence of temperature interfacial polarizations intervals joule loss factor loss tangent low frequency material measured moisture content moisture levels mole oak specimens observed variability ovendry percent relative humidity plate polarizable elements properties of wood Q-meter quencies and humidities RH a 80 RH D 65 RH o 30 room temperature Rs/Rp SOAKED 0 90 species specimen capacitance specimen holder specimen samples tangent of Douglas-fir Teflon thermally activated thermocouple total polarization values various fre various frequencies wafers wood and hardboard XDuan-aaj