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Arylmethylenemalononitrile의 가수분해반응메카니즘과 그의 반응속도론적 연구
김태린,임무일,Tae-Rin Kim,Mu-Ill Lim 대한화학회 1973 대한화학회지 Vol.17 No.2
여러 pH에서 3,4-methylenedioxyphenylmethyllenemalonitrile의 가수분해속도상수를 자외선분광광도법에 의하여 측정하여 넓은 궤도 범위에서 잘 맞는 반응속도식을 구하였다. 이 속도식에 의하면 가수분해 반응메카니즘 특히 종전에 잘 규명된 바 없는 산성 용매 속에서의 반응 과정을 잘 설명할 수 있다. 즉 pH 5 이하에서는 물의 첨가로서 가수분해가 시작되며 pH 6∼8 사이에서는 물분자와 수산화이온의 첨가가 경쟁적으로 일어나나 pH 9 이상에서는 수산화이온만이 첨가된다. 한편 친핵성 시약과 촉매 역할을 겸하고 있는 수산화이온 및 물의 역할로 잘 설명할 수가 있었다. The rate-constants of hydrolysis of 3, 4-methylenedioxyphenylmethylenemalononitrile are determined by ultraviolet spectrophotometry at various pH and a rate equation which can be applied over wide pH range is obtained. The rate equation reveals that below pH 5.0 and above pH 9.0, the hydrolysis is initiated by the addition of water and hydroxide ion respectively. However, at pH 6.0-8.0 the competitive addition of water and hydroxide ion occurs. The catalytic contribution of hydroxide ion and water can be fully explained by the rate equation obtained.
신정우 ( Jeong Woo Shin ),우대현 ( Dae Hyun Woo ),박일경 ( Ill Kyung Park ),이무형 ( Mu Hyoung Lee ),임주섭 ( Joo Sup Lim ),박상욱 ( Sang Wook Park ),김성준 ( Sung Joon Kim ),안석민 ( Seok Min Ahn ) 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.1
Human Powered Aircraft (HPA) should be light in weight and have high efficiency because power source of propulsion is human muscles. Airframe structure takes up most of empty weight of aircraft, so weight reduction of structure is very important issue for HPA. In this paper, design/analysis/test procedures for ultra light weight structure of the HPA developed by Korea Aerospace Research Institute (KARI) are explained briefly. Structural design is conducted through case studies on HPA in the USA and Japan. Loads analysis is performed to calculate design loads which is needed for structural design and analysis. Structural analysis is conducted for structure sizing. Static strength test of main wing spar which is primary structure of wing is performed to verify structural integrity.