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Volume 15 (2001)
- Issue 4 Pages 230-
- Issue 3 Pages 176-
- Issue 2 Pages 60-
- Issue 1 Pages 9-
Volume 15, Issue 2
Displaying 1-3 of 3 articles from this issue
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Toshinobu Soma, Hiroko Kagaya, Masaru Sato, Mayumi Takaya2001 Volume 15 Issue 2 Pages 60-62
Published: April 30, 2001
Released on J-STAGE: April 27, 2009
JOURNAL FREE ACCESSBy taking into account the contributions of the band and local mode frequencies, the temperature- and pressure-dependent mean-square displacement in AI-Li solid solution was quantitatively calculated. Next, the concentration-dependence of the Debye temperature at higher and lower temperatures is estimated. The Debye temperature decreases with increasing the solubility of Li at low temperatures, while it increases at higher temperatures. Then, the compression effect on the solidus curves in the α-phase AI-Li solid solution is expressed by applying Lindeman's melting law to the alloy systems, and an increase of solubility exceeding 20 at. % Li in Al is predicted under pressure.View full abstractDownload PDF (174K) -
Takahiro Ohmura, Mikinori Tsuboi, Toshio Tomimura2001 Volume 15 Issue 2 Pages 63-67
Published: April 30, 2001
Released on J-STAGE: April 27, 2009
JOURNAL FREE ACCESSAn estimation method of the plane directional thermal conductivity of fibrous heat insulators using both the cyclic heat and transient hot-wire methods is proposed. By assuming that the thermal conductivityλh of anisotropic materials like fibrous heat insulators obtained by the transient hot-wire method is equivalent to that of the isotropic materials which have the same bulk density ρ and specific heat c as the anisotropic materials, the thermal conductivity λh is shown to be equal to √λxλy, that is, a geometrical mean of the thermal conductivities in the direction of the plane and the thicknessλx, λy of the anisotropic materials. ln addition, as for a fibrous heat insulator of alumina silica blanket (ρ=125kg/m3), the thermal conductivity λh and the thermal conductivitiesλx andλy are measured in the temperature range -140°C to 300°C using the transient hot-wire method and the cyclic heat method, respectively. Then, from the comparison of the measured results with estimated values onλx, it is confirmed that the present simple method can estimate the measured values fairly well.View full abstractDownload PDF (2025K) -
Masanori Monde, Yuhichi Mitsutake2001 Volume 15 Issue 2 Pages 68-74
Published: April 30, 2001
Released on J-STAGE: April 27, 2009
JOURNAL FREE ACCESSA new procedure to estimate diffusivity and thermal conductivity is developed by using a solution explicitly obtained from an inverse problem of one-dimensional unsteady heat conduction. This method has merit being independent of surface condition and is simpler than existing methods, which commonly use a direct heat conduction solution and are subject to a boundary condition. The thermal diffusivity is estimated by using a change in the temperatures including some error at two different points. The values estimated thereby are found to be in good agreement with that for the tested material.View full abstractDownload PDF (787K)
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