In this study we have developed a mean field model to obtain the phase diagrams for m C 1 and NI&Br. The phase diagrams obtained from our macroscopic theory are in good agreement with those obtained experimentally.
In this study we have developed a mean-field model to obtain the phase diagram for a mixture of liquid crystals. Our mean-field model gives the phase diagram of the nematic, smectic A and smectic C phases near the NAC point. We have fitted our model to the experimentally observed data. From this fitting, we conclude that our mean-field model explains correctly the experimentally observed behavior of a mixed liquid crystalline system near the NAC point.
In this study we obtain analytically the transition temperature T, which is similar to the one due to Allen and Dynes, and the isotope effect. Using the Eliashberg theory that includes both the electron-electron and electron-phonon interactions in superconductors, we calculate the transition temperature T, and the coefficient (Y of the isotope effect for a group of superconductors under study.Our results are in agreement with those obtained previously, but they tend to exhibit discrepancies as the transition temperature T, increases for some superconducting materials.
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