A high density ( 10 19 m −3 ) hydrogen plasma has been sustained successfully in axially non-uniform static magnetic field configurations for frequencies both above and below the high density limit of the lower hybrid resonance frequency (LH-HD). Wave field measurements suggest several modes are coupling to generate these helicon plasmas. The dependence of the plasma density on the static magnetic field strength for a fixed geometry can be explained by waves, with wavelength close to the antenna length, that couple to the fundamental radial mode for frequencies below the LH-HD frequency and to the second radial mode for frequencies above the LH-HD frequency.

This paper describes the light-microscopic observations of polystyrene latexes with spherical particles of two different diameters, d and 1.4-1.9d. Polystyrene latexes are available for simulating real structures in intermetallic compounds. An amorphous state appeared for a few hours after stirring or vibrating the latexes, and subsequently, the Laves phase structure nucleated and grew by the Brownian motion of the particles whose diameters were d and 1.4-1.7d. The structures of the observed Laves phase were classified into the MgCu2 and the MgZn2 types, containing such lattice defects as grain boundaries, dislocations, vacancies or mis-arranged particles.

No abstract

SUMMARY: Silsesquioxanes having 1-(2-methoxy-1-benzothiophen-3-yl)-2-[5-(4-butylphenyl)-2, 4-dimethylthiophen-3-yl]perfluorocyclopentenes as the pendant groups were synthesized. Photochemical conversion from the open-ring to the closed-ring forms of the dithienylethenes increases when the methyl group at 2-position of the benzothiophene ring is replaced by a methoxy group. The conversion is dependent on the content of dithienylethene in the polymer chain. No appreciable difference in the photochemical conversion was observed below and above the glass transition temperature (T g ) of the polymer films. The activation energies of coloration and bleach processes were obtained to be 0 -1 and 1 -3 kcal/mol, respectively.