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피막처리 시간에 따른 Mg-Al 합금의 플라즈마 전해 산화 피막 특성
이두형,김보식,장시영,Lee, Du-Hyung,Kim, Bo-Sik,Chang, Si-Young 한국재료학회 2008 한국재료학회지 Vol.18 No.5
Pure Mg and Mg-6wt.%Al alloy were coated by the plasma electrolytic oxidation with various coating times and the microstructural and mechanical characteristics of the coatings were investigated. The coatings on pure Mg and Mg-6wt.%Al alloy consisted of MgO and $Mg_2SiO_4$. The surface roughness and thickness of the coatings became larger as the coating time increased. The coatings on the Mg-6wt.%Al alloy were more uniform and thicker than those on pure Mg. The microhardness and friction coefficient of the coatings increased progressively as the coating time increased. In addition, the coatings on the Mg-6wt.%Al alloy compared to pure Mg showed improved microhardness and a better friction coefficient.
가스분사법으로 제조된 Mg-6 wt.% Al-1 wt.% Zn 합금의 시효특성
이두형,김보식,장시영,Lee, Du-Hyung,Kim, Bo-Sik,Chang, Si-Young 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.4
The aging characteristics of gas atomized Mg-6 wt.% Al-1 wt.% Zn alloy were investigated and compared to those of cast Mg-6 wt.% Al alloy. The gas atomized Mg-6 wt.% Al-1wt.% Zn alloy powders had spherical morphology between 1 and 100 $\mu m$ in diameter. After compaction under the pressure of 700 MPa at $320^{\circ}C$ for 10 min, the Mg-6 wt.% Al-1 wt.% Zn alloy showed a grain size of approximately 40 $\mu m$ which is smaller than that of the cast Mg-6 wt.% Al alloy, and a relative compact density of approximately 93%. After ageing, the Mg-6 wt.% Al-1 wt.% Zn alloy showed much faster peak hardness than cast Mg-6 wt.% Al alloy. The Mg-6 wt.% Al-1 wt.% Zn alloy showed the new fine precipitations with ageing time, while the cast Mg-6 wt.% Al alloy was almost similar morphology.
오이류 덩굴쪼김병 방제에 관한 연구 (2) 오이 덩굴쪼김병 방제를 위한 약제의 효과에 관하여
이두형,Lee Du Hyung 한국응용곤충학회 1969 한국식물보호학회지 Vol.7 No.-
오이덩굴쪼김병에 대한 Carbamisol. NCS, Similuton, Soill, Captan, Difolatan, Grand 및 소석회등의 토양소독효과를 침지법, Zentmyer법, pot 및 포장시험 등으로 시험한 결과 다음과 같다. 1. 침적법에서는 공시된 약제중 소석회를 제외하고는 모두 살균효과가 있었다. 그러나 Zentmyer의 drench법에서는 Grand 유제와 Similuton을 제외하고는 모두 살과균효가 없었다. 2. Pot시험에서는 Grand 유제가 가장 효과적이었고 그 다음이 Similuton 및 oxysporum의 수도 Grand 유제를 처리한 구가 타약제구에 비하여 현저하게 적었다. 3. 포장시험에서의 오이덩굴쪼기병에 대한 약제의 효과는 화합물의 종류에 따라 차이가 있는데, 공시된 살균제중 Grand유제가 가장 효과적이었으며 다음으로 Difolatan이 효과적이었다. The effects of submerged method. Zentmyer's drench method. pot test and field test with materials such as Carbamisol (ammonium methyldithiocarbamic acid $30\%$), NCS (ammonium N-methyldithiocarbamate$50\%$, Similuton(ethyl phenethynylmeroury $3.3\%$), Soill(N-ethylmercuric p-toluensulfonanilide $4\%$, Captan (N-trichloromethylthio-1, 2, 3, 6-tetra-hydrophthalimide $80\%$), Difolatan(N-tetrachloroet-hylthio 4cyelohexeno-1,2-dicarboximide $80\%$, Grand(2, 3-dibromepropionitryl $20\%$, trichloronitroethylene $20\%$) and Calcium hydroxide upon occurrence of Fusarium wilt of cucumber were studied. The results are summarized as follows. 1. According to submerged method, all the compounds tested were highly inhibitory to mycelial growth of Fusarium oxysporum f. cucumerinum except calcium hydroxide. But several compounds were no inhibitory to the causal fungus except Grand and Similuton, with Zentmyer's drench method. 2. Grand was the most effective fungicide for the control of cocumber Fusarium wilt in the pot test, and followed by Similuton and calcium hydroxide. The population of Fusarium oxysporm was markedly reduced when soil was treat with Grand compared with other chemicals. 3. Fungicidal effects upon occurrence of Fusarium wilt of cucumber under the field experiment varied with the fungicides. Of the fungicides tested. Grand gave the best control, and followed by Difolatan.
오이류 덩굴 쪼김병 (만할병) 방제에 관한 연구 (1) 오이류 덩굴쪼김병균(만할병균)의 기생성에 관한 조사
이두형,Lee Du Hyung 한국응용곤충학회 1969 한국식물보호학회지 Vol.7 No.-
본 시험은 오이류 덩굴쪼김병균의 병원성을 조사하기 위하여 실시하였으며 공시균 24균주를 오이, 참외, 김치 참외, 멜론, 수박 및 수세미오이에 접종한 결과는 다음과 같다. 1. 수박분리균은 수박가 멜론에 대하여 강한 병원성을 나타냈고 그 중에는 김치참외 흑은 참외에 대해서도 병원성을 나타낸 것이 있었다. 2. 오이분리균은 병원성에 따라 네가지 형으로 나눌 수 있는데 오이에 대해서 강하게 병원성을 나타내면서 참외, 김치참외 및 멜론을 감염하는 것이 있었으며, 오이에 대해서는 병원성이 없거나 아주 약하게 나타난 것이 김치참외에 대해서는 강한 병원성을 나타낸 것이 있었다. 또 참외, 김치참외 및 멜론에 대해서만 강한 병원성을 나타내고 오이에 대해서는 전혀 병원성이 없는것과 오이, 참외, 김치참외, 멜론에 대해서는 강한 병원성을 나타내는 한편 수박에 대해서도 중간정도의 병원성을 나타내는 것이 있었다. 3. 참외 분리균은 병원성에 따라 네 가지 형으로 나눌 수 있는데 참외, 김치참외 및 멜론을 강하게 침해하는 것과 참외, 김치참외, 멜론은 물론 수박에 대해서도 병원성이 있는 것이 있었다. 또 김치참외 및 멜론에 대해서 병원성이 약하게 나타난 것과 멜론에 대해서는 강하게 병원성을 나타내고 수박을 약하게 침해하는 것이 있었다. 4. 오이류 덩굴쪼 병균은 병원성에 따라 수박덩굴 쪼김병균, 오이덩굴쪼김병균 및 멜론덩굴쪼김 병균으로 대별할 수 있었으나 공시돈 오이류 덩굴쪼김병균간의 병원성이나 기생범위가 반드시 일정하기 않기 때문에 몇 개의 form specine로 재정리하고 오이류에서 선발된 몇가지 판별품종에 대한 병원성에 따라 race로 나누어야 할 것이다. These studies aimed to investigating the pathogenicity of Fusarium isolates from the wilted cucur bitaceous plants and the pathogenicity of 24 isolates to cucumber, oriental cantaloup, oriental pickling melon, sponge gourd. muskmelon and watermelon were as follows. 1) The isolates from wilted watermelon and melon severely and one of the isolates was slightly pathogenicon oriental pickling melon or oriental cantaloup. 2) The isolates from wilted cucumber were four types. some of the isolates were severely pathogenic on cucumber and infected oriental cantaloup. oriental pickling melon and melon. Some of the isolates were not pathogenic or slightly pathogenic on cucumber. but these were severely pathogenic on oriental pickling melon. One of the isolates was severely pathogenic on oriental cantaloup oriental pickling melon and melon, but no pathogenic on cucumber and one of the isolates was also severely pathogenic on oriental cantaloup. oriental pickling melon and melon and moderatly pathogenic' on water melon. 3) The isolates from wilted oriental cantaloup were four types some of the isolates infected oriental cantaloup, oriental pickling melon and melon severely and some of the isolates were pathogenic on oriental cantaloup. oriental pickling melon. melon and watermelon. One of the isolates, was slightly pathogenic on oriental pickling melon and melon but one of the isolates was highly pathogenic on melon and infected watermelon slightly. 4) Wilt Fusarium of the cucurbitaceous plants could divide into the group of wilt Fusarium of watermelon, cucumber and muskmelon according to the pathogenicity but it will have to rearrange to one form species from several form species of wilt Fusarium of the cucurbitaceous plants and ought to divide to races according to pathogenicity on severely fixed differential varieties which selected from the cucurbitaceous plants. because of the degree of pathognicity and host range are not surely fixed between isolates of wilt Fusarium of the cucurbitaceous plants tested.