会計情報のコントロール機能に関する行動契約理論的研究

早大学位記番号:新7708早稲田大

Analytical Study on Temperature Distribution and Thermal Stress of Concrete in Tunnel Fire

トンネル等の閉空間において火災が生じた場合，コンクリート表面部は高温に曝されることとなる．そこで，コンクリートの火害に関する研究の一環として，トンネルのような閉空間で火災が生じた場合に，覆工コンクリートの表面部がどの程度の温度まで上昇するか熱流解析を行った．さらに，熱流解析の結果を基に，温度応力解析を実施した．解析では，コンクリートが高温に曝されることにより剥落する現象を表現するために，コンクリートの破壊基準を設けて，基準に達したコンクリートを徐々に削除する方法を用いて行い，より実際に近い形での解析方法の検討を行った．It is known that a surface of tunnel lining concrete is exposed to high temperature, when the fire was generated in enclosed space such as tunnels. Then, the computational fluid dynamics analysis was carried out to estimate about concrete damages caused by fire. The analysis was carried out from the viewpoint of size of heat sources and existence of wind. As the results, it was made clear that concrete just above fire source was exposed to high temperature, when there is no wind. Also, it was made clear that the range exposed to high temperature enlarged, though temperature just above fire source in case when the wind blows, became lowers than that in case when there is no wind

2,2′-Bipyridine and Malononitrile as Additives for Styrene Living Radical Polymerization

[中文文摘]研究了稳定自由基存在下苯乙烯的活性聚合。发现在 2 ,2′ 联吡啶的存在下 ,苯乙烯聚合的分子量控制效果提高 ,分子量可控 ,分子量分布较窄。在与丙二腈共同作用时 ,可在 4h内达到 85 %的转化率 ,分子量分布在 1 .5以下 ,分子量控制误差在 2 0 %以下。设计分子量在 1 0 ,0 0 0 90 ,0 0 0 ,实测分子量和理论分子量相近.[英文文摘]Living free radical polymerizations of styrene were studied using benzoyl peroxide as an initiator in the presence of TEMPO(2,2,6,6-tetramethylpiperidinyl-1-oxy). The effect of MN/bpy malononitrile/2,2′-bipyridine additives on the control of molecular weight is explored. It was found that styrene polymerization was distinctly accelerated by MN/bpy additives and the theoretic molecular weight tallie well with the experimental molecular weight. Using the additives in a 1∶1.2 molar mixture of BPO and TEMPO with molbpy∶mol TEMPO = 2∶1 , molMN ∶mol TEMPO = 2. 5 at 135 ℃, the conversion of the styrene polymerization reached 85 % , the polydispersitics is below 1.5 and the difference between the theoretic molecular weight and the experimental molecular weight was cont roled below 20 %.固体表面物理化学国家重点实验室基金资助项目 (1130