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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.
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.