http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Chitosan, PVA, 그리고 Chitosan/PVA 피막의 특성과 사과 겹무늬썩음병균 Botryosphaeria dothidea의 포자분산 억제작용
이승지,박동찬,김이부,엄재열,이용현 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.5
Chitosan을 피막을 형성하여 포자분산을 억제하는 새로운 사과 겹무늬썩음병 방제법의 피막재로 활용코져 연구하였다. Chitosan 필름과 polyvinylalcohol(PVA)을 혼합한 chitosan/PVA 혼합필름을 제조하고 인장강도, 신장률, 점도 등 물성을 검토하였다. Chitosan/PVA 혼합필름이 chitosan 단독 필름보다 우수한 피막형성능을 보였다. FT-IR spectra 분석결과 chitosan과 PVA간에는 새로운 화학결합 형성은 관찰되지 않았다. Chitosan과 chitosan/PVA 필름은 Botryosphaeria dothidea에 대한 상당한 항진균활성을 보였다. Chitosan과 chitosan/PVA 필름은 생분해성평가 공시균주들에 의하여 생분해성을 보인 반면 PVA 단독필름은 생분해성을 나타내지 않았다. 위의 각종 피막을 이용하여 과수원에서의 B. dothidea의 포자분산 억제효과를 측정한 결과, chitosan/PVA 혼합피막이 우수한 피막형성능과 피막지속성을 보였고, 포자분산 억제효과도 가장 우수하였으며, 1%의 chitosan과 5%의 PVA를 혼합한 피막의 경우 포자분산 억제률은 97.0%에 달하였다. The applicability of chitosan, a biodegradable natural polymer, as the coating material to prevent the dispersal of the spores of the apple white rot agent Botryosphaeria dothidea, was investigated. The physical properties of mixed chitosan/polyvinyl alcohol(PVA) film showed the increased physical properties for film formation, such as tensil strength, elongation, and viscosity, compare to either chitosan or PVA film. The FT-IR spectra of chitosan/PVA film indicated that the film was formed by simple blending not by any new synthetic bond. The chitosan and chitosan/PVA film showed effective antifungal activity on B. dothidea. The formed films were well decomposed by ASTM strains used for biodegradability test, on the other hand, the PVA film could not be decomposed by above standard strains. The field test at apple orchard showed that the dispersal of B. dothidea spores could be effectively reduced by coated film, especially by chitosan/PVA film. The spore dispersal was reduced upto 97.0% by 1.0% chitosan/5.0% PVA film during 4 months.
혐기소화에 의한 Biogas 생산과 Biomethamol 전환에 관한 고찰
남재잭(Jas Jak Nam),신중두(Joung Du Shin),홍승길(Seung Gil Hong),함현식(Hyun Sik Hahm),박우균(Woo Kyun Park),소규호(Kyu Ho So) 유기성자원학회 2007 유기물자원화 Vol.14 No.4
바아오가스는 유기물의 혐기소화과정에서 생기는 부산물로 열에너지와 전기에너지로 사용되어왔다. 바이오디젤생산의 반응물과 연료로 사용되고 있는 메탄올의 수요는 꾸준히 증가하고있다. 본 총설에서는 메탄올을 메탄올로 전환하는 직접부분산화법의 최근 발전 동향을 간락한 메탄올합성의 역서와 함께 다루었으며, 산업 규모에서 주로 사용되고 있는 증기갲리반응과 현재 연구단계에서 발전하고 있는 촉매산화법을 비교하였다. 이 총설에서는 바이오가스로부터 메탄올전환의 가능성이 기술적인 축면과 경제적 실용성면에서 제시되었다. Biogas is a byproduct after anaerobic digestion of organic materials and has been used as an energy source for heating and generating electricity. Demands of methanol for fuel mixed with gasoline and reactant in biodiesel production are steadily being increased. In this review, we summarized recent advancements in direct partial oxidation of methanol synthesis. The steam reforming and the catalytic oxdiation of methane to methanol were compared, the former of which are mainly used in industrial scae and the latter in a stage of research and development. On the basis of this review, the possibility of methanol conversion from biogas was proposed in the aspect of the technological feasibility and the economical practicability.
이재석(Lee, Jas-seok) 한국동양정치사상사학회 2015 한국동양정치사상사연구 Vol.14 No.2
이 글은 고려 후기 동아시아 국제체제에서 사대의 관점에서 고려의 국제관계의 특질을 살피는데 목적이 있다. 이 시기 동아시아 국제사회는 시대에 따라 상이하게 구성되지만 고려, 송, 거란, 금, 서하, 원, 명과 같은 국가가 존립해 이룬 국제체제로, 이 체제에서 각 국가는 외교력을 발휘해 힘의 균형을 유지하고자 노력했다. 이 체제에서 이들 국가는 중국중심적 국제질서에 특유한 외교형식인 책봉과 조공제도와 규범에 따라 행동했다. 전통시대 사대는 예란 규범, 책봉-조공과 같은 제도, 세력균형이란 정책 등 복합적 성격을 띄는데, 사대의 규범적 성격에도 불구하고 세력균형이란 정책의 특징이 강했다. 특히 고려 시대 동아시아 사회는 다수의 유력한 국가가 출현해 경합을 했으므로 각국은 사대를 주요 대외정책의 수단으로 활용했고, 고려 또한 예외는 아니었다. 이 논문은 사대의 관점에서 고려후기 대외정책을 살피려는 것이다. This article aimes at analysing the international relations of late Koryo dynasty in East Asian international system which was composed of such states as Koryo, South Sung China, Jurchen Chin, Mongol and Ming empire. Koryo dynasty tried to balance power by means of the investiture-tribute system according to the norms of Chinese world order except the period intervened by Mongol empire. Late Koryo dynasty also struggled to resist Mongol"s unacceptable demands for about forty years. With Ming, new born country rising, she adopted pro-Ming foreign policies for national interests of her independent survival and territorial restoration. However, she also dared to bring on war against Ming demanding northern area of Koryo. In the late period, although Koryo dynasty fluctuated between Mongol and Ming empire, she went over Ming"s side to promote her national interests in the end. In conclusion, late Koryo dynasty"s foreign policies was flexible, pragmatic and free of ideological restrictions.
김택기,송홍재,임영언 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.3
The magnetic properties of amorphous Fe_(80)Si_xP_(20-x) alloys prepared by single roller quenching method have been investigated by Vibrating Sample Magnetometer and DC B-H loop tracer. The electrical properties and structure analysis have been studied by Electrical resistance measurement apparatus and X-ray diffractometer. The results are as follows; 1. The amorphous forming range of Fe_(80)Si_xP_(20-x) alloy s is 2≤x≤10, and the density increases linearly from 6.95 gr/cc at x=2 to 7.09 gr/cc at x=10 with increasing Si concentration. 2. The saturation magnetization and coercive force increase linearly from 152 gr/cc at x=2 to 168emu/gr at x=10 and from 0.29 Oe at x=2 to 7.37 oe at x=10 with increasing Si concentration, respectively. 3. The crystallization temperature and curie temperature increase from 695k at x=2 to 770K at x=10 and from 593k at x=2 to 643k at x=10 with increasing Si concentration, respectively. The crystallization temperature is about 100∼130K larger than curie temperature. 4. The electrical resistivity of amorphous state is from 150μΩ㎝ at x=2 to 155μΩ㎝ at x=10 with increasing Si concentration, and the amorphous state is about 40μΩ㎝ larger than that of crystallized state. 5. The temperature coefficient of resistivity for amorphous state is about 10 times larger than that of crystallized state, and increase linearly with increasing Si concentration.
일반철도 유지보수 합리화를 위한 궤도틀림 기준 연구방향
김수정(Soo-Jeong KIM),이병혁(Byeong-Hyeok Lee),이두재(Du-Jas Lee),엄종우(Jong-Woo Eom) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Currently the train operating environment to affect track irregularity is changed rapidly such as speed-up linear improvement and rolling stack upgrade. The recent track maintenance criteria of track irregularity was quoted from past Japan's and the needs of revision of criteria are increased because of the rapid change in train operating environment. In case of enhance the track irregularity criteria it secure driving safety and riding comfort but maintenance cost are increase. And also decrease ballast durability by frequent corrective work. In case of mitigate the criteria it decrease driving safety and riding comfort but save the maintenance cost. The study for enacting rational criteria did not carry out so far. In this study survey the domestic and international track irregularity and case study for track irregularity inspection results and maintenance history for guideline of enacting irregularity criteria study.