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  • Articles  (60)
  • Articles: DFG German National Licenses  (60)
  • Life and Medical Sciences  (43)
  • thermal conductivity  (17)
  • 1985-1989  (60)
  • 1940-1944
  • 1987  (60)
  • Physics  (60)
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  • Articles  (60)
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  • Articles: DFG German National Licenses  (60)
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  • 1985-1989  (60)
  • 1940-1944
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  • 1
    Electronic Resource
    Electronic Resource
    Temperature and pressure effects on the thermal conductivity of TlCl and TlBr (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 607-620 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; hot-wire method ; thallium bromide (TlBr) ; thallium chloride (TlCl) ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hot-wire method was used to measure the thermal conductivity of both TlCl and TlBr. The measurements were performed in the temperature range 120–300 K and at pressures up to 2.3 GPa. An analysis of the thermal conductivity data showed that the Leibfried-Schlömann formula is a better description for TlBr than for TlCl. For both TlBr and TlCl the effect of optic phonons on thermal conductivity cannot be ignored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503646
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  • 2
    Electronic Resource
    Electronic Resource
    Knudsen-effect errors with transient line-source measurement in fluids (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 39-46 
    Details
    ISSN: 1572-9567
    Keywords: Knudsen effect ; propane ; thermal conductivity ; thermal diffusivity ; transient line-source method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper decribes the Knudsen-effect errors of the transient line-source method used for accurate measurements of the thermal conductivity and thermal diffusivity of fluids. The analysis demonstrates that the instrument can be used with a good accuracy (〉0.5%) to lower densities than previously thought. The principal errors are illustrated by measurements on propane in the temperature range 250–300 K at densities less than 9 kg · m−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503223
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  • 3
    Electronic Resource
    Electronic Resource
    Reduction of lattice thermal conductivity by point defects at intermediate temperatures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 257-262 
    Details
    ISSN: 1572-9567
    Keywords: alloys ; germanium ; intermediate temperatures ; phonons ; point defects ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lattice thermal conductivity is reduced by point defects because they scatter phonons. An analytic expression can be derived only in the limit of high temperatures; at lower temperatures one must have recourse to numerical calculations. Because the conductivity is due mainly to phonons of low frequencies when point-defect scattering is strong, the high-temperature approximation can be used at temperatures above half the Debye temperature. Numerical calculations, using the Ge-Si system as an example, show that the error incurred by using the high-temperature approximation is less than 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515208
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal conductivity of steam from 250 to 510°C at pressures up to 95 MPa including the critical region (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 283-292 
    Details
    ISSN: 1572-9567
    Keywords: critical range ; high pressure ; thermal conductivity ; steam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New measurements of the thermal conductivity of steam have been performed in the temperature range 250–510°C and in the pressure range from 1 up to 95 MPa. Most of the measurements were taken at temperatures greater than the critical temperature, where the enhancement of the thermal conductivity is observed. The experimental values are compared to the IAPS formulation for the thermal conductivity of water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503942
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal conductivity of Inconel 718 and 304 stainless steel (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 593-606 
    Details
    ISSN: 1572-9567
    Keywords: comparative technique ; Inconel 718 ; stainless steel ; standards ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of thermal conductivity measurements on Inconel 718 and 304 stainless steel by the comparative and flash diffusivity techniques are reported for the temperature range 0–700°C. For 304 stainless steel, excellent agreement with published data is found for the specific heat, thermal diffusivity, and thermal conductivity. In the case of Inconel 718, the measurements show that the conductivity depends critically on the sample thermal history and the metallurgical condition of the alloy. Measurements on a solution-treated sample indicated a conductivity function close to that reported previously, while precipitated samples showed a higher conductivity, similar to the conductivityvs-temperature function used for reduction of comparative thermal conductivity data with Inconel 718 references. These results indicate that Inconel 718 is not a suitable reference for high-accuracy comparative thermal conductivity measurements unless its thermal history and associated conductivity function are known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503645
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental investigation of extinction properties and thermal conductivity of metal-coated dielectric fibers in vacuum (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 263-280 
    Details
    ISSN: 1572-9567
    Keywords: anisotropic scattering ; fibers ; insulations ; low-pressure CVD ; low temperatures ; Mie theory ; scaled diffusion law ; spectral extinction coefficient ; thermal conductivity ; totally reflecting fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes first experimental steps of an attempt to replace evacuated multifoils by metal-coated dielectric fibers as a new superisolation. Calculations of the Rosseland mean of spectral extinction coefficients for thin highly relective fibers show that radiation transport can be reduced to the same extent that is achievable with multifoils. Experimental results of extinction coefficients and thermal conductivity of Al-coated glass fibers are reported. Apparently, the metal coating does not increase seriously the small solid thermal conductivity of pure glass fibers. The procedure for optimizing this insulation is thus reduced to an optimization of its extinction properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515209
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal conductivity of ethane in the critical region (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 293-304 
    Details
    ISSN: 1572-9567
    Keywords: critical region ; ethane ; high pressure ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A coaxial cylinder method was used to measure the thermal conductivity of ethane in the pressure range from 10 up to 280 bar and in the temperature range from 308 up to 365 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503943
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  • 8
    Electronic Resource
    Electronic Resource
    The thermal conductivity of gases: Incorrect results due to desorbed air (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 317-333 
    Details
    ISSN: 1572-9567
    Keywords: air ; argon ; helium ; hot-plate apparatus ; hydrogen ; impurities ; krypton ; measurement error ; methane ; neon ; nitrogen ; steady-state method ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Air desorbed from the measuring instrument can falsify the thermal conductivity of a gas measured by steady-state methods. For a guarded hot-plate apparatus the contamination effect was determined to depend on both the residence time in the system and the temperature. The investigation covered the gases H2, He, Ne, CH4, N2, air, Ar, and Kr. For gases whose conductivity is better than that of air (H2, He) the measured values are too small, and for gases of poorer conductivity they are too high. Corrections for the effect of impurity have been applied to the measurements presented. These impurity corrections are considerably larger than the precision of the measurements, but they are of the order of the estimated overall uncertainty of the measurements. The departures between the corrected thermal conductivities reported here and values taken from the correlations in the literature run up to 5 % at the highest temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503945
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  • 9
    Electronic Resource
    Electronic Resource
    Accurate thermal conductivity coefficients for argon based on a state-of-the-art interatomic potential (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 193-204 
    Details
    ISSN: 1572-9567
    Keywords: argon ; Hartree-Fock dispersion (HFD) potential ; interatomic potential ; shock-tube conductivity ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An accurate interatomic potential was constructed by fitting a realistic function, constrained by theory, to a set of judiciously selected macroscopic and microscopic properties but not including thermal conductivity. Using this potential, accurate values of thermal conductivity of argon are obtained for the temperature range 100 to 6600 K. These are presented in tabular form as well as in terms of a correlation function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515202
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  • 10
    Electronic Resource
    Electronic Resource
    The thermal conductivity of n-hexane, n-heptane, and n-decane by the transient hot-wire method (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 663-670 
    Details
    ISSN: 1572-9567
    Keywords: n-hexane ; n-heptane ; n-decane ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New absolute measurements of the thermal conductivity of liquid n-hexane, n-heptane, and n-decane are reported. The measurements have been carried out in the temperature range 300–370 K at atmospheric pressure in a transient hotwire instrument. The accuracy of the measurements is estimated to be ±0.5%. The density dependence of the thermal conductivity of n-hexane and n-heptane is found to be well described by a universal equation for the hydrocarbons based on a rough hard-sphere model. The measurements of the three hydrocarbons studied are also employed to generate more accurate effective core volumes, which are the only parameters characteristic of the fluid required for the application of the proposed universal scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500786
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