Author: Grigoriy I. Torgovnikov
Publisher: Springer Science & Business Media
ISBN: 3642774539
Category : Technology & Engineering
Languages : en
Pages : 208
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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 : Dielectrics
Languages : en
Pages : 36
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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: Canada. Forest Research Division
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: R. F. S. Hearmon
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages :
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Author: William Lanpheer James
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 20
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Book Description
Author: Christen Skaar
Publisher: Springer Science & Business Media
ISBN: 3642736831
Category : Technology & Engineering
Languages : en
Pages : 292
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Book Description
Wood is formed in an essentially water-saturated environment in the living tree, and the cell wall remains in this state until the water flow from the roots is interrupted, such as by felling the tree. The wood then begins to lose most of its moisture by drying, resulting in changes in most of its physical properties. These changes, and their relationship to the environment to which the wood is subsequently ex posed, are the subject of this book. The text consists of six chapters. The first chapter discusses cer tain empirical relationships between wood and water, methods of measuring wood moisture content, factors which affect its equilib rium moisture content, and the effect of moisture content on wood strength. The second chapter treats the thermodynamics of moisture sorption by wood, inc1uding enthalpy, entropy, and free energy changes. The third chapter discusses some of the theories which have been proposed to explain the sorption isotherms for hygroscopic ma terials such as wood. Chapter 4 considers hygroexpansion or the shrinking and swelling of wood associated with moisture change. Chapter 5 is concerned with how moisture moves through the cell wall of wood in response to both moisture and temperature gradients. The sixth and final chapter discusses the theoretical and practical aspects of the electrical resistance and dielectric properties of wood, in c1uding the principles involved in their application in electrical moisture meters.
Author: William Lanpheer James
Publisher:
ISBN:
Category : Moisture
Languages : en
Pages : 36
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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: Canada. Department of Northern Affairs and National Resources
Publisher: Forest Products Laboratories of Canada
ISBN:
Category : Dielectric measurements
Languages : en
Pages : 22
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Book Description
