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La0.6Ba0.4Co1-xFexO3(x=0∼1.0) 촉매상에서의 NO 환원 반응
박종원,박대원,오광중,조경목,홍성수 ( J . W . Park,D . W . Park,K . J . Oh,K . M . Cho,S . S . Hong ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Perovskite-type oxides have been tested for the reduction of NO using propane as reductant. Especially the perovskite-type oxides were prepared by malic acid method to increase the surface area. The effects of several variables such as reaction temperature, the concentration of reactants, residence time have been also investigated. In addition, in the presence of water and SO₂, the activity of catalysts has been examined. In the LaCoO₃ type perovskite oxide, the partial substitution of Ba into A site enhanced the activity of NO decomposition and the activity shows the high activity in wide reaction temperature. In addition, the partial substitution of Fe into B site also enhanced the conversion of NO.
NTC 써미스터가 내장된 항온 제어용 소형 열전 냉각 모듈 제조
박종원,최정철,황창원,최승철,Park J. W.,Choi J. C.,Hwang C. W.,Choi S. C. 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.3
NTC 써미스터를 내장시킨 소형의 열전 냉각 모듈을 제작하고 LD와 같은 광통신부품에 적용하기 위한 온도제어 및 항온유지 특성을 분석하였다 BiTe계 열전반도체 21쌍으로 구성된 열전 모듈은 크기 $7.2 mm{\times}9 mm{\times}2.2 mm$이고, 내장된 써미스터의 빠른 응답속도로 인해 정밀온도제어가 가능하다. 열전 모듈은 성능 지수(Z) $2.5{\times}10^{-3}$/K, 300 K에서 최대 온도차(${\Delta}T_{max}$) 72 K, 최대 흡열량($Q_{max}$) 2.2W 값을 나타내었으며 온도 제어 정밀도는 대기 중에서 ${\pm}0.1^{\circ}C$내였다. 이는 광통신 부품의 작동 환경 안정성을 확보할 수 있는 항온제어용 소형 열전 모듈로서 적용이 가능하다. NTC thermistor embedded miniature thermoelectric module was fabricated for the precise temperature control of optical communication device such as laser diode (LD). The miniature thermoelectric module ($7.2 mm{\times}9 mm{\times}2.2 mm$) consists of 21 BiTe thermoelectric couples, the operating temperature is precisely controlled by embedded thermistor with quick response. The figure-of-merit (Z), maximum temperature difference (${\Delta}T_{max}$), maximum cooling capacity ($Q_{max}$) of the miniature thermoelectric module were $2.5{\times}10^{-3}$/K, 72 K, 2.2 W respectively and temperature could be controlled in range of ${\pm}0.1^{\circ}C$ accuracy in air. The fabricated miniature thermoelectric module is suitable for applications of the optical communication packaging.
수계 종속영양세균의 섬유소 분해능에 미치는 Phenoxyacetic Acid 계 제초제의 영향 및 제초제 분해균주의 분리
박종원,조홍범,최영길,이호용 ( J W Park,H B Cho,Y K Choi,H Y Rhee ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.2
The ratio of cellulolytic bacteria to heterotrophic bacteria were about 24.8∼67.6% in Han River. It was identified that Aeromonas sp. DJ-1 was the highest cellulolytic bacteria. Cellulase activity of Aeromonas sp. DJ-1 decreased about 55-64%, 45∼70% by treatment of phenoxy herbicide 2,4-D, 2,4,5-T, respectively. 2,4,5-T degrading bacteria were not isolated, but 2,4-D degrading bacteria were about 0.0001 ∼0.0016% ranges among total heterotropic bacteria. The two isolates, HUD21 and HUD51, capable of degrading of 2,4-D, were identified as Pseudomonas sp. and Agrobacter sp., respectively. These isolates in the ability of biodegradation of 2,4-D shown the degradation rate of 99% after 2 days, and the 2,4-D degrading optimum temperatures are 30˚C for HUD21, 37˚C for HUD51. The genes encoding enzymes of 2,4-D degradation were located at plasmid.
TiO₂ 첨가가 Mn - Zn Ferrites의 자기적 특성에 미치는 영향
박종원(J. W. Park),한영호(Y. H. Han),이상효(S. H. Lee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.6
Mn-Zn ferrites에 TiO₂가 첨가될 때 전력손실, 밀도, 초기투자율, 저항, 그리고 미세구조의 변화를 고찰하였다. 첨가량이 증가함에 따라 밀도는 증가했지만, 초기투자율은 감소하였다. TiO₂의 첨가에 따라 electron hopping을 일으키는 활성화에너지와 전기저항이 증가하였다. 1150 ℃에서 소결한 TiO₂를 1.5 wt% 첨가한 시편은 1 ㎒, 25 mT, 80 ℃에서 83 ㎽/㎤의 전력손실을 나타내었다. 그러나 1200 ℃에서 소결할 때는 과대입성장이 발생하여 같은 측정 조건에서 1168 ㎽/㎤의 전력손실을 얻었다. The effect of TiO₂ addition has been studied on the power loss, density. initial permeability, resistivity, and microstructure of Mn-Zn ferrites. TiO₂ addition increased the density of sintered body and decreased of the initial permeability. Activation energy for electron hopping as well as electrical resistivity increased with TiO₂ addition. The toroidal core sintered at 1150℃ with 1.5 wt% of TiO₂ demonstrated the power loss of 83 ㎽/㎤ at 1 ㎒, 25 mT, 80℃. However, the same specimen sintered at 1200℃ lead to the power loss, 1168 ㎽/㎤ at 1 ㎒, 25 mT, 80℃ and developed an exaggerated grain growth.
TiO₂ 첨가가 Mn - Zn Ferrites의 자기적 특성에 미치는 영향
박종원(J. W. Park),한영호(Y. H. Han),이상효(S. H. Lee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.6
Mn-Zn ferrites에 TiO₂가 첨가될 때 전력손실, 밀도, 초기투자율, 저항, 그리고 미세구조의 변화를 고찰하였다. 첨가량이 증가함에 따라 밀도는 증가했지만, 초기투자율은 감소하였다. TiO₂의 첨가에 따라 electron hopping을 일으키는 활성화에너지와 전기저항이 증가하였다. 1150 ℃에서 소결한 TiO₂를 1.5 wt% 첨가한 시편은 1 ㎒, 25 mT, 80 ℃에서 83 ㎽/㎤의 전력손실을 나타내었다. 그러나 1200 ℃에서 소결할 때는 과대입성장이 발생하여 같은 측정 조건에서 1168 ㎽/㎤의 전력손실을 얻었다. The effect of TiO₂ addition has been studied on the power loss, density. initial permeability, resistivity, and microstructure of Mn-Zn ferrites. TiO₂ addition increased the density of sintered body and decreased of the initial permeability. Activation energy for electron hopping as well as electrical resistivity increased with TiO₂ addition. The toroidal core sintered at 1150℃ with 1.5 wt% of TiO₂ demonstrated the power loss of 83 ㎽/㎤ at 1 ㎒, 25 mT, 80℃. However, the same specimen sintered at 1200℃ lead to the power loss, 1168 ㎽/㎤ at 1 ㎒, 25 mT, 80℃ and developed an exaggerated grain growth.