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Alkali Borate 유리에 있어서 있어서 철이온의 Mo¨ssbauer 效果에 關한 硏究
申榮男,朴冠鎬,洪致裕 동국대학교 재료과학연구소 1982 材料科學硏究所 論文集 Vol.2 No.-
酸化鐵을 넣은 Alkali Borate 非晶質 유리를 만들어 Mo¨ssbauer Spectrum으로 Mo¨ssbauer parameters와 철 ion의 狀態에 대해서 硏究되었다. 試料의 成分은 X% A, (100-X)% B_2O_3, 4% Fe_2O_3로 하여 A는 K_2O, Na_2O, 및 K_2O이고, X=10,20 및 30을 취했다. 이 混合物을 잘 섞어 電氣爐에서 900℃ 溫度로 約 2時間동안 용융시켰다. I.S.와 Q.S.는 X가 增加함에 따라 減少함을 보였고, Li-Na-K의 原子半經에 따라 I.S.는 增加함을 보이나 Q.S.는 감소함을 보였다. 線幅은 X가 增加함에 따라, Li-Na-K 順序로 減少함을 보였다. Amorphous alkali borate glasses were prepared to contain 4 mole% of ferric oxide as impurity. Mo¨ssbauer parameters and the state of iron in alkali borate glasses were studied by Mo¨ssbauer spectra. X% A_2O, (100-X)% B_2O_3, 4% Fe_2O_3, where A=Li, Na or K and X=10, 20 or 30 are composed, were prepared. Mixtures were melted in air in furnace at 900℃ for two hours. Isomer shift and quadrupole splitting were decreased according to increasing of X component, and according to increasing of X component. Isomer shift was increased but quadrupole splitting was decreased. And the line width was decreased according to increasing of X component and Li-Na-K series.
金榮咸,李基善 동국대학교 재료과학연구소 1982 材料科學硏究所 論文集 Vol.2 No.-
眞空蒸着 및 浸淸方法에 의한 CdS/Cu_2S 太陽電池의 製作에 있어 carrier 포획층인 CdS薄膜 및 光吸收層인 Cu_2S層의 形成條件과 接合形成 후의 熱處理條件等을 調査하였다. CdS薄膜 蒸着時의 基板溫度는 180℃ 程度가 적당하였고, Cu_2S層의 형성은 PH 4의 CuCl 溶液에 약 5초간 浸淸하는 것이 最適이었다. Cu_2S層 形成後의 熱處理는 190℃의 溫度에서 10∼30分間 實施하는 것이 적당하였다. In fabricating the CdS/Cu_2S solar cells by vacuum evaporation and dipping method, the optimum conditions for forming CdS thin film as a carrier collection layer and Cu_2S layer as a light absorption layer, as well as the optimum heat treatment condition after formation of Cu_2S layer, have been investigated. The optimum substrate temperature was about 180℃ when depositing CdS thin film, and the best Cu_2S layer was obtained by dipping CdS thin films into CuCl solution of PH 4 for about 5 seconds. Also the best results was obtained when the fabricated junction was heat treated at 190℃ for 10∼30 minutes.
成墉吉,李春基,金恩植,朴冠鎬 동국대학교 재료과학연구소 1982 材料科學硏究所 論文集 Vol.2 No.-
Poly(2-hydroxyethyl methacrylate) 수화겔막을 통한 알칼리금속 염화물의 투과현상을 전기투석법을 이용하여 연구하였다. 친수성 수화겔막은 가교제 ethyleneglycol dimethacrylate(EGDMA), 단량체 2-hydroxyethyl methacrylate(HEMA) 및 중합개시제 azobismethylisobutyrate(AMIB)를 사용하여 45%(V/V) H_2O 중에서 중합 제조하였다. 제조된 poly(2-hydroxyethyl methacrylate)막에 대한 알카리금속 염화물 LiCl_2, NaCl, KCl 등의 투과현상은 일정한 전압에서 전기투석기속에서 관측되었으며, 투과된 용질의 농도 측정분석은 볼꽃광도계법을 이용하였다. 측정된 투과량과 양이온의 겉보기직경, 용질의 자체확산계수 및 용액중의 양 이온의 수송수를 비교 검토하고 poly(2-hydroxyethyl methacrylate) 수화겔막에 대한 나트륨이온(Na^+)의 선택성 여부를 조사검토 하였다. The transport phenomena of alkali metal chlorides through poly(2-hydroxyethyl methacrylate) hydrogel membrane have been studied using electrodialysis. The hydrogel membranes were prepared by the polymerization of 2-hydroxyethyl methacrylate in the presence of 45%(V/V) H_2O and ethyleneglycol dime-thacrylate. The initiator used in the polymerization was azobismethylisobutyrate (AMIB) prepared from azobisisobutyronitrile(AIBN) using Mortimer method. The permeability of alkali metal chlorides such as LiCl, NaCl and KCl at 50 voltage was obtained. The permeability of NaCl was also observed at 30, 40, 50, and 60 voltages respectively. The concentration of solutes permeated through the membrane was measured by flame photometry. The experimental results have been discussed with the comparison of apparent solute molecular size, the self-diffusion coefficient of solutes, and the transport number of cations in aqueous solution. These indicates that poly(2-hydroxyethyl methacrylate) hydrogel membrane shows a specific selectivity for sodium ion.
ON A CATEGORY STRUCTURED OBJECT IN FINITELY COMPLETE CATEGORY
Lee, Jong Chun 동국대학교 재료과학연구소 1981 材料科學硏究所 論文集 Vol.1 No.-
Ens의 Category-structured-object에 의해 small category가 meta-categorical하게 결정됨을 증명함. In this paper the meta-categorical construction of a small category from a category-structured-object in Ens is established.