Compression for data archiving and backup revisited
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
Calculations by Mazur, Montroll, and Potts (MMP) have shown that local modes above the optical branch of the host crystal are predicted by a linear diatomic-chain model for all positive values of the mass-defect parameter ε. Three-dimensional calculations show that local modes exist only for values of ε greater than some critical value. However, these three-dimensional calculations require a knowledge of the eigenvalues and eigenvectors of all the phonon states of the host lattice. We show that the simpler MMP model can be applied to three-dimensional crystals by inclusion of the LO-phonon frequency. In a given system of host crystal and impurity, the determinant parameters are the mass defect of the impurity and the width of the host-crystal reststrahlen band. Calculations on approximately 20 solid solution systems of the form AB1-xCx have successfully predicted the existence or nonexistence of a local mode when x is large and the mass of B is less than the mass of C. The modified one-dimensional model gives quantitative results for local-mode frequencies which agree with full three-dimensional calculations for local modes in NaI, CdS, and Si. © 1970 The American Physical Society.
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
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Active Matrix Liquid Crystal Displays Technology and Applications 1997
Q.R. Huang, Ho-Cheol Kim, et al.
Macromolecules
A. Nagarajan, S. Mukherjee, et al.
Journal of Applied Mechanics, Transactions ASME