Author: Frederic I. DavisPublisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
A System for the Measurement of the Thermal Conductivity of Dielectrics at Low Temperatures
Author: Frederic I. DavisThe Measurement of the Thermal Conductivity of a Wire at Low Temperatures
Author: Robert W. TrennA System for Low-temperature Measurements of Thermal Conductivity: Measurements on Silicon from 770 to 3000K.
Author: Ronald J. HolyerPublisher:
ISBN:
Category : Low temperatures
Languages : en
Pages : 90
Book Description
Measurement of Thermal Conductivity at Low Temperatures
Author: B. H. VosA System for Low-temperature Measurements of Thermal Conductivity
Author: Ronald J. HolyerPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 112
Book Description
A system has been designed and constructed to measure thermal conductivity by the series comparative method in the temperature range 4 to 300K. A sample temperature of 77K was reached when the cylindrical sample chamber 3-1/4 inches in diameter and 8-3/4 inches long was evacuated to a pressure of 0.000003 Torr and submerged in a bath of liquid nitrogen held in a 5-1/2 liter stainlesssteel dewar. Temperatures as low as 4.2K could be obtained if the sample chamber were submerged in liquid helium. Temperatures between that of the liquid bath and room temperature were obtained by electrical heating. A simple Wheatstone bridge circuit, one arm of which was a copper resistance thermometer made from 140 ohms of B and S No. 36 copper wire, served to regulate automatically the electrical heating so as to give a drift in sample temperature of less than 0.002 deg/min. Measurements were attempted from 77K to 300K on a sample of n-type single-crystal silicon with an impurity concentration of 5X10 to the 15th power cu cm. Armco iron was used as a standard. Temperatures were measured with copper vs constantan thermocouples. The thermal conductivity of the sample was found to range from 8.7 watt/cm-degK at 98K to 1.8 watt/cm-degK at 255K. These values agree with those of Carruthers et al. Within 7% and of Glassbrenner and Slack within 10%. (Author).
Dielectric Properties of Wood and Wood-Based Materials
Author: Grigoriy I. TorgovnikovPublisher: Springer Science & Business Media
ISBN: 3642774539
Category : Technology & Engineering
Languages : en
Pages : 208
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.
Low-temperature Specific Heat and Thermal Conductivity of Noncrystalline Dielectric Solids
Author: Proceedings of the 4th Conference on Thermal Conductivity
Author: Thermal Conductivity of Solids at Room Temperature and Below
Author: Gregg E. ChildsPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 632
Book Description
Author: