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D.A. Hall B. Cherdhirunkorn P.J. Withers T. Mori 《Journal of the mechanics and physics of solids》2005,53(2):249-260
This paper presents micromechanics based analysis of elastic strain and changes in the texture of poled polycrystalline ferroelectric PZT ceramics for direct comparison with synchrotron X-ray measurements. The grains are modelled as spherical inclusions, to which transformation strains are assigned depending on the fractions of different ferroelectric domains. Eshelby's inclusion problem with the classical self-consistent method is applied to evaluate the elastic state of the grains. In particular, the elongation due to lattice elastic strain is calculated as a function of inclination Ψ relative to the polar axis. The ratio of diffraction peak intensities, corresponding to the domain fractions, is also expressed as a function of Ψ. This analysis identifies the special character of the reflection, for which the lattice strain along in the stress free state is independent of ferroelectric domain population and hence unaffected by poling. The elongation due to the lattice strain parallel to and peak intensity ratio are expressed in terms of the overall macroscopic strain of a poled specimen, each having a dependence. 相似文献
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Kunlaya Cherdhirunkorn Norimichi Tsumura Toshiya Nakaguchi Yoichi Miyake 《Optical Review》2006,13(3):138-145
A spectral turn method is presented as a spectral based color correction method compatible with the standard RGB system by
applying the idea of a multi-spectral method. The multi-spectral based color reproduction technique has been proposed for
providing independent color of device and viewing conditions. However, it is difficult to replace the RGB devices with high
cost multi-spectral devices since the latter have advanced only to the laboratory level. In the proposed method, the standard
RGB values are converted into spectral information, then returned to RGB values for different viewing conditions. This process
provides more accurate reproduction than the conventional forward process of the color reproduction. An experiment of psychophysical
color matching was performed to evaluate the technique. The mixed chromatic adaptation model was applied to the method in
the experiment, and the results showed the effectiveness of the proposed method. 相似文献
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