The use of SiC in the ladle not only improves the mechanical property of cast iron but the deoxidizing. desulphurizing and degasifying action taking place eliminates blow holes and refines the grain.

抄録全体を表示

以前は日本文化といえば歌舞伎や相撲といった伝統文化であったが、現在、マンガやアニメといったオタク文化は世界に誇れる数少ない日本の文化であると同時に経済価値が存在する。工場が海外移転し、技術力が国外に流出している中でこういったオタク文化の今後は、日本経済を支える重要なコンテンツであることは明白である。 そして、その人気や経済的効果は国内に留まらず世界中に広まっている。しかし近年、その人気とは裏腹にアニメ等の売り上げが低下してきている。その原因としては、不況や各国の事情、インターネット上の違法配信サイトの台頭など様々なものが挙げられる。そこで、日本国内の状況と海外の状況を比較し、オタク文化の資産価値に焦点を当て、その経済的価値を経営学視点から考察する。

抄録全体を表示

  For the determination of residual Ce, La and Ca in cast iron, the following methods were employed. Namely, colorimetry by oxine-chloroform for Ce, flame-metry for La and colorimetry by plasmocorinth for Ca. They were extended for the analysis of cast iron and accurate results was obtained.
  1) Ce: Anhydrous Na₂ SO₄ was added to the extracted oxinate chloroform solution. After 30 min., stable color was obtained. Ca, Mg and Th did not interfere, but Mn effected when it's content exceeded 0.75%. The accuracy in analysis was within +0.001%∼−0.002%.
  2) La: Addition of ethyl alcohol to the La containing solution enables more accurate results for it, by the excitation of flame emission. Mn, Ca, Ce, Th, Mg did not interfere. The error was within ±00.001%.
  3. Ca: The method that does not collect Ca in precipitation but keeps in solution was examined. Above method assured ±0.001% accuracy. Mn, Cr, Ni, Mg, Ce, Th did not interfere.

抄録全体を表示

Asama Volcano repeatedly erupted in 2004. Six major eruptions were identified, each of which discharged more than 10, 000 tons of ash, lapilli, and bombs from the summit crater. Five were single Vulcanian explosions including the first eruption on 1 September. They are common in Asama, as thousands of Vulcanian explosions occurred in the last century. However, the series of eruptions from 14 to 18 September was unusual for Asama. It was an ash eruption. An eruption plume of a few kilometers high intermittently rose above the summit crater for the first two days. It was sustained by the morning of 16 September. From the plume, sand-sized micropumice and free-crystals continuously showered down at Karuizawa, 10 km SE from the source. It was observed for the first time since the notorious 1783 eruption that the juvenile was dominant among fallout. This makes a remarkable contrast to preexistent material by Vulcanian explosions. In the evening, a small amount of ash (1-0.1 g/m²) reached as far as Tokyo, 150 km from source. Incandescent bombs ejected from the summit crater were seen from the slopes until midnight. The maximum range traveled by the bombs in 2004 was 2.2 km. It was measured at the NW flank for the 1 September explosion and also at the W flank for the 23 September explosion. In total, 3.7 × 10⁸ kg of ash, lapilli, and bombs were ejected from the crater in 2004. This is no more than 8 % of new lava, which was emplaced on the crater floor in the middle of September. An Internet forum is a useful tool for risk communication during a volcanic crisis. Thousands of messages were posted on three boards of a forum during the 2004 crisis. They described detonations, ash fallout, and other unrests of Asama. Some of them were posted ahead of not only television news but also official Volcano Information issued by Japan Meteorological Agency. Although Internet forums are very helpful for volcano risk communication, readers must use caution to distinguish the false from the true.

抄録全体を表示