α-D-glucose anhydride was transferred into its monohydrate by the method of hydration, and inversely α-D-glucose monohydrate was also transferred back into its anhydride by the method of pyrolysis. In these experiments, the crystal surfaces were observed with an optical microscope, and the crystal structures of both glucoses were studied by an X-ray diffraction in detail. As a result of these experiments, it was found that glucose monohydrate exists in the form of rod-like and needle-like granules and in the form of a larger grain shaped like a plate. And also, powder diffraction lines of both glucoses were analysed. In the discussion of these experimental results, the mechanism of mutual transitions was made clear.
Magnetic interaction and remanence properties in (Co81Ni7Pt12)100−x(SiO2)x films (x=0–8) have been studied for high-density longitudinal recording. Films with SiO2 contents of 6 and 8 mol %, in which sufficiently isolated CoNiPt grains with a diameter of about 10 nm and a random orientation of the c axis of hcp structure are observed, show a significant low-noise property as well as high coercivity. Both frequency dependence of the media noise and magnetic domain structure in the remanent-magnetized state show that the exchange interaction between grains is eliminated by the grain boundary of the SiO2 phase with the width of 2 nm. In such films, high coercive squareness of 0.9 on the remanence curve is obtained, while the squareness on the hysteresis curve decreases as the SiO2 content increases. Henkel plot indicates that ‘‘ferromagnetic’’ interaction among the grains sustains such high squareness on the remanence curve. The strength of the interaction depends on the film thickness and is proportional to the squareness on the remanence curve. The origin of the ‘‘ferromagnetic’’ interaction among grains is discussed, mainly based on the magnetostatic interaction.
This study is about a novel small piezoelectric pump . The pump utMzes a thin vibration plate on which bimorph type piezoelectric actuators generate progressive wave , Characteristies of the pump are investigated by eXperiments . 工 t is observed that direction of flow depends on driving frequency and the 血 rection does not always agree with phase of driVing voltage signals apphedto the piezoelecthc elements ,Behaviors of several part of the Vibration plate in the pump ease f且ユ ed or not f皿 ed with water are investigated with laserDoppler Vibration sensor . Itお clari 丘edthat phase ofsinusoidal Vibration ofthe each part does not agree with the phase of driving signal . Interaetion between Vibration plate and water may cause the phellomenon .
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