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나노파우더형 Co/Al2O3 촉매를 활용한 NaBH4 가수분해반응 특성 연구
윤성모,이태훈,오택현 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.4
Co/Al2O3 nanopowder was used as a catalyst to investigate the effect of catalyst support, reduction temperature, sodium borohydride (NaBH4) concentration, sodium hydroxide (NaOH) concentration, and reaction temperature on the characteristics of NaBH4 hydrolysis. The Co/Al2O3 nanopowder showed a high catalytic activity among various catalysts. Catalyst reduction at 250℃ exhibited a relatively good activity. The activity decreased with an increase in the NaBH4 concentration. Conversely, the activity increased and then decreased with an increase in the NaOH concentration. Additionally, the activity increased with an increase in the reaction temperature. The value of apparent activation energy was 40.81 kJ/mol, which was lower than the other Co-based catalysts. Thus, Co/Al2O3 nanopowder catalyst can be widely used for NaBH4 hydrolysis owing to its superior catalytic activity.
틸팅열차 차체8 탄소섬유직물/에폭시 복합재의 모우드 II 층간파괴인성 평가
윤성모,이은동,허광수,정종절,신광복,Yoon Sung-Ho,Lee Eun-Dong,Heo Kwang-Soo,Jung Jeong-Cheol,Shin Kwang-Bok 한국철도학회 2005 한국철도학회논문집 Vol.8 No.2
Mode II interlaminar fracture behaviors of carbon fabric/epoxy composites, which are applicable to tilting train carbodies, was investigated by the ENF (End notched flexure) test. The specimens were made of CF3327 plain woven fabric with epoxy and a starter delamination at one end was made by inserting Teflon film with the thickness of 12.5$mu$m or 25.0$mu$m. The equation for mode II interlaminar fracture toughness was suggested based on the effective crack length from the compliance of load-displacement curve. Mode II interlaminar fracture toughness was evaluated for several types of the specimens. Also crack propagating behaviors and fracture surfaces were examined through an optical travelling scope and a scanning electron microscope.
장남기,윤성모 한국잔디학회 1994 한국잔디학회지 Vol.8 No.3
This report was investigated on the soil and mineral nutrient erosions in comparison among the vegetation floors of M isranthus sisensis, Arternisia stelleriana, Rhododendron mucronula turn, Zoysia ja-ponira and Pinus deusitlora communities and the naked soil on Mt. Keum-hak in Cheolwon-Koon, The erosion of clay, silt, fine sand and coarse sand of the surface soils under the Z. japonira grass-land was far less then those of M. sinensis, A. stelleriana, R. murronulatum and P. densiflora com-munities and the naked soil, The loss of mineral nutrients due to the soil erosion was the lowest level in the Z. japonira grassland and the highest level in the P. densiflora forest and the naked soil, respectively.
康祥俊,尹成模 춘천교육대학교 과학교육연구소 1974 과학교육연구 Vol.1 No.-
강원도 춘성군 향로산록을 중심으로 경사도에 따른 초지의 생산성과 그 변동 및 토양과의 관계를 알아보기 위하여, 1970년 5월부터 9월까지 조사가 수행되었으며 다음과 같은 결과를 얻었다. 1) 본 초원은 새(Arundinella hirta), 억새(Miscanthus sinensis)가 공통 우점종으로 전체의 57.9%를 점유하고 있으며, 천이계열에 있는 불완전한 군락이었다. 2) 각 경사도별 조종의 구성은 평지(0˚)에서 14종, 10˚에서 20종, 20˚에서 21종, 30˚에서 28종, 그리고 40˚에서 32종으로 경사가 커짐에 따라 조종의 출현이 많았다. 그리고 생산성은 경사가 심할수록 저하되었다. 본 조사지의 면적을 20정보로 보았을 때 0˚에서 845.68㎏, 40˚에서 433.48㎏로서 30˚이상 되는 경사지에서는 초지조성이 부적하다는 결론을 얻었다. 또한 우점식물인 새, 억새가 전체 생산량의 60%이상이므로 총 생산량을 좌우하는 것은 새, 억새이다. 3) 토양양료 중 인산 및 석회와 초지의 생산성과의 상관은 각각 r=0.832, r=0.712로서 정상관을 보이었다. 따라서 본 조사지에서 초지의 생산성을 지배하는 요인을 인산, 석회 기타 부식층의 깊이라고 하겠다.
금화 철원지역 자연초지의 군락구조, 생산력, 재생력 및 토양특성에 관한 연구
장남기,윤성모 한국잔디학회 1995 한국잔디학회지 Vol.9 No.1
The investigation was made on the relationship among vegetation, net productivity, regrowth and soils of Moonheri-Wasoori, Soodowon-Sungilkyo and Mt. Kumhak grasslands in Chulwon area. The following conclusions have been made as the results of this study. The vascular flora of the grassland in Moonheri-Wasoori was composed of 102 species, the most of which were Medicago denticulata, Miscanthus sinensis, Arundinella hirta, Festuca ovina and Cassia nomame. The flora of Soodowon-Sungilkyn grassland was composed of 74 species, the most of which were Arundinella hirta, Miscanthus sinensis, Carex nanella, Festuca ovina and Cassia nomame. It of Mt. Kumfiak grassland was composed of 78 species, the most of which were Arundinella hirta, Carex nanella, Festuca ovina, Miscanthus sinensis and Aster scaber. These five species contributed greatly to the standing crop of live material which was in excess of 60% of it. The peak standing crop of each 413.7, 307.6 and $348.7g /m^2$ in Moonheri-Wasoori, Soo- dowon-Sungilkyn and Mt. Kuruhak grasslands wars reached in August under flooded conditions as a result of the growth of dominant species, Medicago denticulata and Arundinella hirta. The net prodution of organic matter was slight in some intervals but occurred throughout the growing season After cutting of grasses, the regrowth of new leaves mainly depended on growing stage and edaphic factors. Characteristics of the natural grassland soils, especially, concerning water, total nitrogen, avail-able phosphorus and exchangeable calcium were clarified and might be depend upon the quantity of plant production. Nitrogen, phosphorus and calcium concentration of leaves of Medicago denticulata, Arundinella hirta and Miscanthus sinensis were higher than of stems. Even if diem we diffurmem in the a-mb of nutrients among Medicago denticulata hirta and Miacanthus sinensis for single species and stands. they were covered by variations within species in the present survey. Key words: Competition, Production, Productivity, Regrowth, Soil Properties, Vascular Flora.
삼림의 생산구조와 생산력에 대한 연구 - 2. 춘천지방의 소나무림과 신갈나무림의 비교
김준호(Joon Ho Kim),윤성모(Sung Mo Yoon) 한국식물학회 1972 Journal of Plant Biology Vol.15 No.3
A comparison between the productivity of the evergreen needle pine(Pinus densiflora) and of the deciduous broad leaved oak(Quercus mongolica) stands, which is located near Choon-Chun city, Kangwon dist. have been established. The pine stand had a stand density of 938 trees per ha and oak stand had of 638 trees per ha. The diameter at breast height (D) and the height of tree (H) of each tree were measured in sample plot of 800㎡. Twelve standard sample trees chose from the sample area felled down, and then weighed the stem, branches and leaves separately, according to both the stratified clip technique and the stem analysis. The vertical distribution of photosynthetic system was arranged effectively for high productivity in the productive structure of both trees. The allometric relation between D^2H and dry weight of stem(Ws), branches(Wb) and leaves(Wl) of pine were approximated by log Ws=0.6212 log D^2H-0.5383 log Wb=O.4681 logD^2H-0.7236 log Wl=0.2582 logD^2H-5.1567 and those of oak were approximated by log Ws=0.5125 log D^2H+0.0231 log Wb=0.5125 log D^2H-0.3755 log Wl=0.8721 log D^2H-2.9710 From the above, the standing crops of pine and oak in the sample area were estimated to be as much as 38.83ton and 48.11 ton of dry matter, above ground, per ha, respectively. Annual net production as the sum of the biomass newly formed during one year was appraised at 12.66ton/ha·yr in pine stand and at 8.74 ton/ha·yr in oak. The reason of high productivity of pine sfand compared with oak might be resulted from much more about 4 times of the amount of the photosynthetic system, but less non-photosynthetic one of pine than those of oak. To increase the productivity of the forest stands investigated it was necessary to make densly a stand density, to be abundant in the inorganic nutrients and to preserve much water in soil to conserve the litters.