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X-ray fluorescence analysis using Cr K(alpha) spectra was applied to the determination of the mixing ratio of Cr(6+) to (Cr(6+) + Cr(3+)) in several mixtures of K(2)CrO(4) and Cr(2)O(3). Because the powder of K(2)CrO(4) contained large particles that were more than 50 microm in diameter, it was ground between a pestle and a mortar for about 8 h. The coarse… (More)
We have developed a widely tunable DFB laser array (TLA) module with a tuning wavelength range as wide as 40.6 nm, a high fiber output power of more than 20 mW, and a low power consumption of less than 2.5 W.