• 제목/요약/키워드: 산소 분압

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Electrical characterization of n-ZnO/p-Si heterojunction diode grown by MOCVD (MOCVD를 이용해 성장한 n-ZnO/p-Si 이종접합 다이오드의 전기적 특성 평가)

  • Han, Won-Seok;Gong, Bo-Hyeon;Kim, Dong-Chan;Jo, Hyeong-Gyun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2007.04a
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    • pp.143-144
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    • 2007

  • 저온 성장이 가능한 MOCVD를 이용하여 단결정 p-Si 기판위에 n-ZnO를 산소분압을 달리하여 성장하였다. 산소유량에 따른 이종접합 다이오드의 전기적 특성을 평가하기위하여 n-ZnO의 전기전도도, 이동도, 캐리어 농도를 측정하였으며, 소자에 저항성 접촉(ohmic contact) 전극을 형성하여 전류-전압 특성을 파악하였다.

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The Effect of Hypocarbic Priming Solutions on Extracorporeal Circulation during Open Heart Surgery (개심술시 충전액의 저이산화탄소 분압이 체외순환에 미치는 영향)

  • Song, Sun-Ok;Suh, Jung-Kook;Kim, Heung-Dae
    • Journal of Yeungnam Medical Science
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    • v.1 no.1
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    • pp.101-106
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    • 1984

  • Before beginning the extracorporeal circulation, perfusionists should supply oxygen into the oxygenator and establish blood flow through the blood line of the heart-lung machine. But these manipulation can induce severe hypocarbic state of priming solutions due to wash out of $CO_2$ gas in the solution. This study was carried out to examine the relationship of blood gas changes between hypocarbic priming solutions and body circulation in 15 patients undergoing open heart surgery with extracorporeal circulation. $PaCO_2$, pH, buffer base and $PaO_2$ were measured from priming solutions before and 15 minutes after the extracorporeal circulation. The results were as follows; 1) Before the extracorporeal circulation, mean $PaCO_2$ level was $12.1{\pm}7.8mmHg$ in the priming solution. However, 15 minutes after extracorporeal circulation, the $PaCO_2$ level was maintained at $35.7{\pm}5.7mmHg$. 2) pH in the priming solution was variable from 6.93 to 7.99 (mean $7.45{\pm}0.29$), but after 15 minutes it was ranged from 7.28 to 7.42 (mean $7.35{\pm}0.05$). 3) Mean buffer base level in the priming solution was $7.9{\pm}3.5mmol/l$, but after 15 minutes, it was $19.6{\pm}1.2mmol/l$. 4) Mean $PaO_2$ level in the priming solution was $667.1{\pm}45.6mmHg$, but after 15 minutes, it was $280.7{\pm}131.7mmHg$.

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