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일본 북부의 소화신산의 분화후에 성립한 두 아카시아나무 림분의 토양중 질소동태
문현식 한국임학회 1999 한국산림과학회지 Vol.88 No.3
To clarify the soil N dynamics, the relationship between soil N and vegetation recovery after volcanic eruptions was investigated in two stands dominated by black locust(Robinia pseudo-acacia L.) on volcano Mt. Showa-Shinzan, northern Japan, from August 1999 to July 1996. No significant differences were observed between the two stands with respect to soil chemical properties and soil extractable N. At both stands, total N concentration were high in spring and declined through the summer and fall. The peaks in concentrations of extractable NH₄^+ and NO₃^- occurred in July at both stands. NH₄^+ mineralization showed a conspicuous peak in June and July throughout the study period. Extractable NO₃^- concentration and nitrification rates at the two stands during the study period were relatively high. Negative values for NH₄^+ mineralization at both stands were found in August. Extractable NH₄^+ and NO₃^- concentrations were correlated positively with soil organic matter, and nitrification rates were controlled by NH₄^+ mineralization and extractable NH₄^+ concentration at both stands.
소화신산의 화산분화후에 성립한 두메오리나무 임분의 질소무기화와 질화작용 - NH$_{4}$
문현식,춘목아관 한국생태학회 1998 Journal of Ecology and Environment Vol.21 No.6
Nitrogen dynamics in mineral soils of an alder (Alnus maximowiczii) stand established on volcano Mt. Showa-Shinzan were measured by laboratory incubation method in order to clarify characteristics of $NH_{4}^{+}$ mineralization and nitrification rate, from August 1994 to July 196. Contents of total N and organic matter were relatively low, but increased in May-July. Extractable $NH_{4}^{+}$ concentrations and $NH_{4}^{+}$ mineralization were high in June and July, and decreased in midsummer and fall. Extractable $NO_{3}^{-}$ concentrations did not vary seasonally. Negative values at $NH_{4}^{+}$ mineralization and nitrification rate were observed in August and September. $NH_{4}^{+}$ mineralization was positively correlated with soil organic matter, and nitrification rates were influenced by extractable $NH_{4}^{+}$ concentration and $NH_{4}^{+}$ mineralization.
기포 저감 장치의 기포입자 유동특성에 따른 수치해석에 관한 연구
문현식,유영철,박성영 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.10
기포 저감 장치는 기름의 정량 공급과 관련된 문제 해결의 목적을 둔 장치이다. 따라서 본 연구에서는 기포 저감 장치의 작동 중 기포 입자의 크기별 유동특성을 확인하고자 수치해석을 진행하였다. 기초해석을 진행한 결과, 기포의 상승과 하강이 가장 활발하게 나타나는 영역을 발견하였고, 그 지점을 중심으로 수치적 계산을 수행하였다. 수치적 계산에 앞서 각 변수들 간의 동차성을 확보하기 위하여 무차원 유도를 수행하였다. 무차원 유도를 수행한 데이터를 바탕으로 각 입자의 크기별, 유체의 속도별 25개의 변수 조건을 설정하여 별도의 계산을 통해 기포 상승과 하강의 대한 수식을 도출하였다. 각 변수별로 항력과 부력의 비를 계산하여 기포에 작용하는 항력이 부력보다 큰 경우 기포가 하강하며 기포는 저감되지 않는다고 판단하였고, 부력이 항력보다 큰 경우 기포는 상승하며 기포가 저감된다고 판단하였다. 수치 계산 데이터를 바탕으로 유동 해석을 진행하였다. 유동 해석을 통하여 기포의 상승과 하강을 확인하였고, 수치 계산의 결과와도 일치하는 것을 확인하였다. Bubble reduction devices are intended to solve problems related to the quantitative supply of oil. Therefore, in this study, numerical analysis was conducted to verify the flow characteristics of bubble particles during the operation of a bubble reduction device. As a result of the basic analysis, the area where the rise and fall of bubbles were most active was found, and numerical calculations were performed focusing on the points. Before the numerical calculations, a non-dimensional derivation was performed to secure homogeneity among the variables. Based on the data obtained from non-dimension derivation, 25 variable conditions for each particle size and fluid velocity were set. Through separate calculations, the equation for bubble rise and fall was derived. By calculating the ratio of drag and buoyancy for each variable, if the drag force acting on the bubble was greater than buoyancy, the bubble falls, and bubbles are not reduced. If the buoyancy is larger than drag, the bubble rises, and the bubble is reduced. Through the analysis, the rise and fall of the bubble were confirmed, and the results were consistent with the separate numerical calculations.
문현식,노일,김종갑 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.3
The study of site characteristics and vegetation structure was carried out to provide basic data for conservation and reasonable management of Korean endemic Corylopsis coreana communities in Jukgok and Ogok-myeon in Gokseong, Jeonnam Province. In C. coreana communities, average soil pH was 5.05, and the content of organic matter, total N and available P was 5.22%, 0.24% and 3.25ppm, respectively-. According to the importance value of each layer; Pinus densiflora, nuercus variabilis of Jukgok and Quercus mongolica, Q. serrata, and Pinus densiflora of Ogok area in the tree layer were high. In the subtree and shrub layer at two study sites, C. coreana has the highest importance value. In subtree layer at the two study sites, species diversity, evenness and dominance ranged from 0.567 to 0.779, 0.401 to 0.509 and 0.491 to 0.509, respectively. The distribution patterns by Morisita's index showed that C. coreana in two study sites was randomly distributed in the subtree and shrub layers.
문현식,권수덕 한국산림과학회 2006 한국산림과학회지 Vol.95 No.1
Closing processes of taping holes and diameter growth of taped trees of Acer mono wereinvestigated to understand the effects of sap taping and number of tapping holes on tree growth and closingspeed of holes. Closing processes of tapping holes were faster at trees taped of ten holes than tres tapped ofone, thre, five holes during the study period, and tapped holes were completely filed up within 15 months.Diameter growth by number of tapped hole were 0.54 m for control trees, 0.60 mm for tres taped of onehole, 0.64 m for trees taped of three holes, 0.33 m for tapped of five holes and 0.31 m for trees tapedof ten holes, respectively. Closing processes of tapping holes by fusion materials was fast in the order of DBcompletely healed within 4 months. Therefore, DB ointment should be used to minimize damage on tree growthand secure resources for sap collection of A. mono.