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全文: "汐止町"
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  • 田中 啓爾
    陸水学雑誌
    1938年 8 巻 3-4 号 588-612_1
    発行日: 1939/03/31
    公開日: 2009/06/12
    ジャーナル フリー
  • 出来 成人, 大多和 政憲, 金治 幸雄
    日本化学会誌(化学と工業化学)
    1979年 1979 巻 12 号 1623-1628
    発行日: 1979/12/10
    公開日: 2011/05/30
    ジャーナル フリー
    CaClゴ璃O系溶液をマトリックスとして,N轡,Co2千,NO,-のおのおののイオンを添加し,マトリックス溶液濃度による添加イオンの挙動を,N轡,Coe+は可視吸収スペクトルの吸光度,波数変化から配位数,配位子の変化を,NOゴは赤外吸収スペクトルの波数シフトから対称性の変化を測定することによって検討を加えた。
    その結果,マトリヅクス溶液の濃度が増すにしたがって,Ni2+は6→4の配位数変化とアクア錯体からクロロ錯体への配位子変化が,Co2,は6→4の配位数変化が,NOゴはDshからC2Cyへの対称性の低下が認められた。これらの変化は,3m。1μ(H2C)/CaCl2比16付近を境として異なっており,マトリックス溶液の濃度増による自由水の減少によって引き起こされると結論された。水のン2+Rockingバンドの波数シフトの挙動とも-致し,Tit+,Co2÷,NOゴィオンの自由水の存在に対する指示薬としての役割が認められた。
  • 大門 啓志, 引地 康夫, 村上 春彦, 松永 浩司, 山田 昇次
    Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
    1999年 107 巻 1241 号 41-46
    発行日: 1999/01/01
    公開日: 2010/08/06
    ジャーナル フリー
    More than 60mol% Zr4+ ion (ZrO2/(Al2O3+ZrO2)) is soluble into anhydrous Al2(SO4)3 crystal lattice. The apparent crystallite size decreases with increasing Zr4+ content, and the thermal decomposition temperature reduces at contents of zirconia >20mol%. Alumina/zirconia composite powders, in which an amorphous zirconia phase is dispersed in a matrix of fine η-alumina particles, are obtained by thermal decomposition of the sulfate solid solution. Tetragonal phase of zirconia crystallizes at 1100°C and the crystallinity increases with increasing the temperature of the heat-treatment. When mono-dispersed ultra fine particles of zirconia are added to η-alumina formed by thermal decomposition of pure anhydrous aluminum sulfate, the η→α phase transformation of alumina is suppressed, and the effect increases with increasing the amount of the additive. On the contrary, a small quantity of ZrO2<1mol% drastically suppresses the phase transformation of alumina formed by decomposition of sulfate solid solution. But, when ZrO2 content is more than 1mol%, the η→α phase transformation of alumina is accelerated. The acceleration effect becomes larger with increasing the content of ZrO2.
  • 藤本 登留, 後藤 健輔, 又木 義博
    材料
    1999年 48 巻 3 号 223-228
    発行日: 1999/03/15
    公開日: 2009/06/03
    ジャーナル フリー
    Fracture toughness tests were performed on the surface layer of boxed-heart square timber of sugi, after and during drying. Experiments were carried out using of notched tensile specimens with single edge. The critical stress intensity factor (KIc) in the TR system was investigated to clarify effects of drying temperature on resistance against drying surface check of the boxed-heart square timber of sugi. Timbers dried with temperatures of 20°C and 80°C had higher resistance against drying check than dried with temperature of 40°C and 60°C. AE cumulative events increased slowly at the occurrence state for the tension tests of the specimens dried with temperature of 20°C and 80°C, whose KIc values were relatively high. On the other hand, AE cumulative events increased relatively fast for the specimens dried with temperature of 40°C and 60°C. Cell-wall break type of micro-fracture occupied the most of fracture in the early wood, when the large amplitude of AE were detected in the early state. Therefore, it was found that the characteristics of AE were closely concerned with KIc values and micro-fracture. The KIc values of the fracture toughness decrease with drying until moisture content of 20%, because of drying stresses. After then, the KIc values increase rapidly with drying under moisture content of 20%. In the drying processes the KIc values have a tendency to be higher with lower drying temperature within this experiment conditions.
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