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30㎚~3000㎚ 광범위 직경 입자의 공기역학적 집속에 대한 수치해석
이광승,이동근 한국입자에어로졸학회 2011 Particle and Aerosol Research Vol.7 No.4
Previous designs of conventional aerodynamic lenses have a limitation of narrow range of focusable particle size, e.g. 30 to 300nm or 3 to 30nm. To enlarge the focusable size range to 30‐3000nm, it is necessary to avoid a significant loss of particles larger than 300nm inside the lenses. From numerical simulations on size‐resolved particle trajectories, we confirmed that the traveling losses of such large particles could be avoided only when the radial position of particles approaching the orifice lens was near the lens axis. Hence, we designed the lens system consisting of a converging‐diverging nozzle and 7 orifices to fulfill the requirement. In particular, the orifices were aligned in a way that their diameters were descending and ascending to the downstream. As a result, 30‐2800nm particles can be focused to the particle beam of 0.2mm or less in radius with above 85% transmission efficiency. Even 10μm particles can be focused with 74% of transmission efficiency.
인삼Saponin의 Aspergilius parasiticus R-716의 생육 및 Aflatoxin생성에 미치는 영향
이광승,장진규 고려인삼학회 1986 Journal of Ginseng Research Vol.10 No.1
The potential effects of ginseng saponin on the growth, aflatoxin production, and physicochemical characteristics of Aspergillus parasiticus R-716 were investigated and the results obtained were summarized as follows. The pH values of culture filtrate were increased with an increase of addition amount of saponins, the amount of mycelium was increased up to l19% by the addition of 0.01% protopanaxatriol saponin (triol). Amount of aflatoxin was increased in proportion as the bright yellow color of chloroform extract of culture filtrate was intensified. There was no difference in sporulation by the addition of 0.02% saponins, however, the sporulation was gradually decreased as the addition concentration of saponins increased. Aflatoxin production was reduced to the level of 8% by the addition of crude saponin, but production of aflatoxin B1 and B2 were inhibited by 56% and 8% with the addition of 0.5% pure saponin. The production of aflatoxin B. was increased by the addition of 0.5% trios saponin, and by the addition of 0.02% biol saponin, aflatoxin G, production reached to the maximum and thereafter it was decreased. 인삼 saponin의 첨가가 Aspergillus parasiticus R-716 공시균의 PH, 균체량의 변화, chloroform 추출액의 색상, 포자형성능, 그리고 saponin의 첨가량에 따른 aflatoxin의 생성 및 억제효과등을 조사한 결과를 다음과 같다. 1. 공시균의 배지인 sucrose low salt의 PH변화는 crude saponin(CS)의 경우 PH3인 0.5% 첨가구에서 가장 낮은 aflatoxin 생성량을 보였으며, PH 2.2인 protopanaxatriol(PPT) 0.05% 첨가구에서 가장 많은 생성량을 보였다. 2. 인삼 saponin첨가량에 따른 균체량의 변화는 PPT 0.01% 첨가구에서 대조구에 비하여 119%까지 증가하였으나 다른 saponin의 첨가농도가 증가할 수록 감소하였고 CS 0.5% 첨가구에서 대조구에 비하여 25.8%의 감소율을 보였다. 3. aflatoxin의 chloroforn 추출시 생성된 색상은 밝은 황색일수록 aflatoxin의 생성량이 많았다. 4. 포자형성은 각 인삼 saponin 농도가 0.02%까지는 변화가 없었으나 0.05%첨가구부터 형성이 줄어들어 0.5% 첨가구에서는 형성되지 않았다. 5. aflatoxin총생성량은 PPD와 PPT 0.005%~0.02% 첨가구에서는 105%까지 증가하였으나 그 이상의 농도에서는 감소를 보였으며, CS의 0.5% 첨가구에서는 91.7%의 높은 억제효과를 보였고 B1, B2, G1 및 G2에 대햐여는 90%이상의 억제효과를 나타내었다. PS에 대하여는 0.5% 첨가구에서 B1에 55.9%의 억제효과가 있는 반면에 B2는 8.1%의 낮은 억제효과밖에 없었고, PPT 0.005% 및 0.5% 첨가구는 오히려 B2가 증가하였다. PPD에 대하여는 0.005%~0.02% 첨가구에서는 G1의 경우 오히려 증가하였다.
나이테 Ca/Al를 이용한 남부지역 소나무 산림의 토양 산성화 이력 평가
이광승 ( Kwang-seung Lee ),딘비흥 ( Dinh Viet Hung ),임상선 ( Sang-sun Lim ),이계한 ( Kye-han Lee ),최우정 ( Woo-jung Choi ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
Soil acidification, which is known to be one of the reasons of forest decline, is associated with decreases exchangeable Ca and increases in Al concentration, leading to low Ca/Al ratio in soil solution. As tree rings are datable archives of environmental changes, Ca/Al ratios of annual growth ring may show deceasing pattern in accordance with the progress of soil acidification. This study was conducted to investigate Ca/Al pattern of Pinus densiflora tree ring in relation with the changed exchangeable Ca/Al ratios of soils with the progress of soil acidification. Three P. densiflora tree disks were collected from P. densiflora forests in Jeonnam province, and soil samples (0-10, 10-20, and 20-30 cm in depth) were also collected from the tree locations. Soils were analyzed for pH, exchangeable Ca and Al concentrations, and Ca/Al was calculated. Annual growth rings formed between 1969 and 2007 were separated and analyzed for Ca/Al. Soil Ca/Al was positively (P<0.01) correlated with soil pH, reflecting changed soil chemistry due to soil acidification. The Ca/Al of tree rings also showed a decreasing pattern from 18.2 to 5.5 during the period, and this seemed to reflect historical acidification of the soils. Our results suggest that Ca/Al of tree ring is likely to be affected by exchangeable Ca/Al ratio of the soils and thus it needs to be considered as a proxy of the progress of soil acidification in P. densiflora forest in southern Korea.