巻号一覧
1992 巻 (1992)
- 241 号 p. 425-
- 240 号 p. 291-
- 239 号 p. 225-
- 238 号 p. 135-
- 237 号 p. 72-
- 236 号 p. 3-
前身誌
1992 巻, 238 号
選択された号の論文の11件中1～11を表示しています
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杉本 賢司, S. WIGNARAJAH1992 年 1992 巻 238 号 p. 135-144
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーExperimental investigations were made to determine the influence of several factors such as temperature, strength, W/G ratio, section modulus, fiber reinforcement etc, on the deformation characteristics of gypsum board during early stages of aging.
It was found that increasing the section modulus or reducing the W/G ratio to be in the range 30% to 32% was effective in the controlling the deformation. It was also found that a decrease in the stress ratio increased the creep factor.
The deformation however, was not significantly affected by humidity or by the amount of glass-fiber added for reinforcement.
With the aid of these results, it was possible to determine the mixing proportion manufacturing conditions that would be effective in reducing the internal stresses and also in preventing the occurrence of cracks during the manufacture of the decorating gypsum board.抄録全体を表示PDF形式でダウンロード (1252K) -
北村 孝雄, 和田 英男, 大池 暹, 秋山 謙次1992 年 1992 巻 238 号 p. 145-151
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーポリアクリル酸ヒドラジド (PAH) の添加が加圧成形したセッコウの機械的性質および耐久性にあたえる影響を検討した。少量 (0.3%) のPAH添加により, 成形体のかさ密度がわずかに大きくなり, 曲げ強度は無添加の34MPaにくらべ43MPaに増大した。圧縮強度は70MPaであった。しかし, 0.7%のPAH添加ではかさ密度がかえって小さくなり, 2水塩の結晶粒も大きくなり強度は低下した。PAHを0.3%添加した成形体の濡れ曲げ強度および濡れ圧縮強度はそれぞれ17MPaおよび45MPaであり, 乾燥強度にくらべかなり低下した。成形体から水中へのカルシウムの溶解速度を測定した結果, 0.3%のPAH添加により, 無添加にくらべ約2/3に溶解速度を抑えることができた.抄録全体を表示PDF形式でダウンロード (1176K) -
上田 満, 飯田 孝道, 浅田 博樹, 若林 一男, 伊藤 孝1992 年 1992 巻 238 号 p. 152-158
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーThe permeation of molten Cu and Ni into CaO compacts has been investigated by a button method, in order to make clear whether the CaO compacts can be used as a refractory for melting metals.
It was found that the metal concentrations in those compacts were a few per cent for nearly all samples of the compacts with a few exceptions. It was also observed that the metal concentrations could be kept low enough in the compacts formed under exactly controlled condition.
From the above results, it was found that the compacts can be used as practical refractories for melting metals.抄録全体を表示PDF形式でダウンロード (1041K) -
飯島 智彦, 大森 良幸, 奥 隆司1992 年 1992 巻 238 号 p. 159-167
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーSome properties of apatite cement which is composed of α-tricalcium phosphate and tetracalcium phosphate were investigated for use as a biomaterial.
The setting time and some physical properties were affected by the liquid/cement (L/C) ratio, but all of these results were suitable to be used for biomaterial.
The results of a fatigue test showed high dynamic strength (30Hz, 200kgf/cm2, 107 cycles). Exothermic temperature of the hydraulic hardening reaction was nearly human body temperature. In a liquid analysis, the concentration of Ca2+ was about 15 ppm and the pH elevation was over 10 at an early stage, but after that, pH fell down around neutrality in 3 days. Finally, the hydraulic hardened product had a porous body that was a good environment for new bone formation.
In animal experiments they showed the excellent new bone formation and high biocompatibility.抄録全体を表示PDF形式でダウンロード (1848K) -
1992 年 1992 巻 238 号 p. 167
発行日: 1992年
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (169K) -
板谷 清司, 相沢 守, 岸岡 昭, 木下 真喜雄1992 年 1992 巻 238 号 p. 168-176
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーPorous calcium phosphate film could be formed on a TiO2 substrate by a spray-pyrolysis technique. The aqueous solutions containing 1.0 mol· dm-3 Ca (NO3) 2 100 cm3, 0.6 mol· dm-3 (NH4) 2 HPO4 100 cm3 and conc. HNO3 6 cm3 were spray-pyrolysed at 600°C for 5, 10 and 15 h, respectively, to form calcium-phosphate layers on TiO2 substrate; TiO2 substrate coated with calcium-phosphate layers was heat-treated at a temperature between 1000°C and 1300°C. The calcium-phosphate film (thickness, -35 μm) containing pores with sizes of -50 μm was formed on TiO2 substrate under the following conditions : the spray-pyrolysis : 600°C and 10 h and the heat-treatment : 1250°C and 5 h. The calcium-phosphate film was bonded to TiO2 substrate through the reaction layers of CaTi4O9 and amorphous materials in the CaO-P2O5-TiO2 system. The surface layer of the film contained chiefly β-Ca3 (PO4) 2, whereas the bulk contained a-Ca3 (PO4) 2.抄録全体を表示PDF形式でダウンロード (2169K) -
橋本 和明, 戸田 善朝, 橋本 甲四郎, 荒井 康夫1992 年 1992 巻 238 号 p. 177-184
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーThe formation of amorphous cobalt phosphate with color of blueish violet (Pe; 56.1%, Y; 9.4%, λd; 456.0 nm) was observed at the initial stage of the liquid reaction at 3°C in CoSO4-Na2 HPO4-H2O system, and the synthetic process of the precipitate, its thermal change and color change on heating were investigated.
The morphology of amorphous cobalt phosphate was spherical aggregate of fine particles with a diameter of ca.100 nm and specific surface area in the range of 50-70m2/g. Amorphous cobalt phosphate dehydrated gradually about 20 weight % in total with heating up to approximately 600°C, and crystallized to Co3 (PO4) 2 with heating at 645°C. It is concluded that the water molecules in amorphous cobalt phosphate is water of crystalline being similar to a free water without coordinated to Co2+ ion because its dehydration reaction begin at low temperature of about 40°C and no its color change by heating. The chemical formula was considered to CO3 (PO4) 2 · nH2O as a precursor of CO3 (PO4) 2 · 8H2O, from results of that amorphous cobalt phosphate changed to CO3 (PO4) 2·8H2O by suspending in mother liquer and its thermal change. The color of fine particles of Co3 (PO4) 2 obtained by heating amorphous cobalt phosphate in air at 800°C was blueish purple (Pe; 10.0%, Y; 18.2%, λc; 560.0nm) in color, though the color changed to deep purple (Pe; 15.8%, Y; 19.8%, λc; 555.1nm) by heating it in vapor steam.抄録全体を表示PDF形式でダウンロード (1314K) -
氷見 康二1992 年 1992 巻 238 号 p. 185-193
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1685K) -
安江 任, 小嶋 芳行, 荒井 康夫1992 年 1992 巻 238 号 p. 194-204
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (2279K) -
原 尚道1992 年 1992 巻 238 号 p. 205-210
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1505K) -
松田 元秀, 山下 仁大, 梅垣 高士1992 年 1992 巻 238 号 p. 211-215
発行日: 1992/05/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (704K)
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