Dielectric Properties of Wood and Hardboard PDF Download
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Author: William L. James
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 36
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Book Description
Author: William L. James
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 36
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Book Description
Author: Grigoriy I. Torgovnikov
Publisher: Springer
ISBN: 9783642774553
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Provided here is a comprehensive treatise on all aspects of dielectric properties of wood and wood products. The topics covered include: Interaction between electromagnetic field and wood. - Wood composition and dielectric properties of its components. - Measurement of dielectric parameters of wood.- Dielectric properties of oven-dry wood. - Dielectric properties of moist wood. - Effect of different kinds of treatment on dielectric properties of wood. - Dielectric properties of bark. - Dielectric properties of wood-based materials. - Recommendations for determination of dielectric parameters of wood based materials and for their use in calculations. Several appendices comprise reference data onthe dielectric characteristics of wood and wood-based materials in the wide range of frequencies, temperatures, and moisture content.
Author: William L. James
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
The dielectric constant and loss tangent of white oak, Douglas-fir, and four commercial hardboards were measured at frequencies from 20 Hertz(Hz) to 50 Megahertz(MHz), moisture conditions from ovendry to complete saturation, temperatures from -20 to +90C., and, for the natural wood, with the electric field alined with three principal structural orientations. The hardboard was measured with the electric field perpendicular to the faces of the board. The behavior of all materials studied was qualitatively similar. The dielectric constant increased with increasing moisture content or temperature, and decreased with increasing frequency.
Author: M. F. Kabir
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Dielectric properties, such as dielectric constant and dielectric loss factor of rubber wood have been studied at different moisture content, grain directions and frequencies. The moisture content has considerable effect on the dielectric constant and dielectric loss factor. The moisture content above 30% shows little change of dielectric properties whereas for the case from 0 to 30% the dielectric constant and dielectric loss factor increases abruptly. The higher value of the dielectric constant and dielectric loss factor were obtained at higher frequencies. The parallel to grain direction also shows higher dielectric properties when compared to perpendicular grain direction. This dielectric anisotropy may be attributed to the microscopic, macroscopic and molecular structure of wood. Empirical equations have been tried for estimating the dielectric properties of rubber wood from moisture content. [Authors' abstract].
Author: John M. Yavorsky
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 70
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Book Description
Author: Grigory Torgovnikov
Publisher: Springer
ISBN: 9783540553946
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Provided here is a comprehensive treatise on all aspects of dielectric properties of wood and wood products. The topics covered include: Interaction between electromagnetic field and wood. - Wood composition and dielectric properties of its components. - Measurement of dielectric parameters of wood.- Dielectric properties of oven-dry wood. - Dielectric properties of moist wood. - Effect of different kinds of treatment on dielectric properties of wood. - Dielectric properties of bark. - Dielectric properties of wood-based materials. - Recommendations for determination of dielectric parameters of wood based materials and for their use in calculations. Several appendices comprise reference data onthe dielectric characteristics of wood and wood-based materials in the wide range of frequencies, temperatures, and moisture content.
Author: W. L. James
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
The effect of mechanical stress parallel to the electric field on the polarizability (dielectric constant) and equivalent parallel conductance of wood was studied as a possible means for monitoring drying stresses. For electric and mechanical stress parallel to the grain, the effect was observable in wood that was moisture equilibrated at 65 percent relative humidity or greater, but was rather small and variable and drifted considerably with time. For stresses perpendicular to the grain, the effect was nearly nonexistent when the mechanical stress was no greater than the proportional limit. The effect also was essentially nonexistent for wood at moisture content lower than about 7%. The effect was generally larger at lower frequencies and was practically negligible at frequencies as high as 100 kHz. These results indicate that dielectric measurements are not feasible as a measure of mechanical stress in wood.
Author: Arthur Douglas Hughes
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 1154
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Book Description
Author: James Keith Welsh
Publisher:
ISBN:
Category : Dielectric measurements
Languages : en
Pages : 274
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Book Description
Author: Kristian Højendahl
Publisher:
ISBN:
Category : Dielectric loss
Languages : en
Pages : 32
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Book Description
