With an operation performed at the pulverized coal rate over 200kg/t-pig and the coke rate below 300kg/t-pig, it has becomeclear that a technical subject posed at this operation is howto improve the reduction-meltdown behavior in the lower part of furnace. (3) It has becomeclear that a factor controlling the pulverized coal injection at the actual furnace is the discharge of unburnt char from the furnace top. Setting the upper limit of injection rate certainly is a subject to be worked out hereafter.

No abstract

No abstract

We have developed an ultrahigh vacuum plasma-enhanced chemical-vapor deposition system, and deposited high-purity device-quality hydrogenated amorphous silicon films. High sensitivity secondary ion mass spectrometry measurements show that impurity contents in the bulk of the present films are reduced to 2×1015 cm−3 for O, 7–10×1015 cm−3 for C, and 5×1014 cm−3 for N; these impurities are normally present at fairly high levels. Nevertheless, extensive light soaking of the films resulted in a defect density as high as 5×1017 cm−3, which is well above the impurity content. This result excludes those models of photoinduced degradation that postulate one-to-one correlation between light-induced defects and O, C, or N impurity atoms.

Keeping the sinter cold strength raised by lowering AI20, content at a fixed level has enabled a sintering with low energy (lower FeOcontent) to be done and the reducibility has been improved from ordinary 60'/• to 680/0 in JIS-Rl. (2) Through the off-line model experiments using this sinter and the tests with the use of the same sinter at the actual furnaces, the raise of a shaft efficiency of 2.0 to 2.5"/• has been attained with the raise of JIS-RI of 50/• at the lumpy zone of blast furnace. At the cohesive zone accompaniedwith the formation of melt exceeding 11 50'C, the amount of FeO-containing Observedfrom the inclinations in Fig. 1