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We have developed a new method for determining the Bardeen-Baym-Pines ͑BBP͒ parameter of a superfluid 3 He-4 He mixture from the measurement of its molar volume within the wide ranges of temperature, pressure, and the 3 He concentration. The method and the results are described. The ranges of the present investigation are 0.4 -660 mK in temperature, 0.3-10 kgf/cm 2 in pressure, and 0.07-0.39 in the 3 He concentration. The data obtained are fitted with a formula based on the phenomenological theory of dilute solutions of 3 He in superfluid 4 He. Our empirical formula can reproduce the experimental values of the BBP parameter within the accuracy of 1%. The argument on the absolute uncertainty is also given.

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We have demonstrated a totally new liquid crystal display (LCD) mode using antiferroelectric liquid crystals (AFLCs). Different from the previous modes using a field-induced antiferroelectric-ferroelectric phase transition, this mode is performed using the dielectric response of helical structures of AFLCs. An in-plane electric field was applied to homeotropically aligned cells, resulting in a fast response of dielectric anisotropy and the associated optical birefringence. The reported LCD mode indicated a fast response on the order of 100 µs in both rise and fall times.