본 연구는 수력발전시설에서 물고기의 생존과 상해를 유도하는 흐름현상을 파악하기 위한 진보된 수치해석기법의 개발을 다루고 있다. 원형 젤의 LES를 실시하여 난류젤의 전단지역에 물고기를 방류하는 실험의 결과를 수치적으로 해석하였다. 이 연구에서는 순간 LES 흐름장이 유속, 압력 그리고 와도의 강한 변동으로 특성지울 수 있으며, 이것이 물고기에게 시간평균 정상류보다 상당히 큰 추진력과 모멘트를 발휘함을 보여준다. 이 연구는 아울러 수력터빈 드래프트관에서의

본 연구에서는 유의파고별, 지오 튜브의 채움비, 지오 튜브 천단고의 변화에 따라 지오 튜브의 안정 및 소파성능에 관한 실험을 실시하였다. 축척은 1/50로 하여 조파 수로내에 모형을 설치하였다. 안정성 시험은 유의파고를 재현하여 지오 튜브의 변위를 계측하여 검토하였다. 지오 튜브의 각 부분의 변위량을 관찰하기 위하여 바닥에 메쉬를 설치하여 계측하였으며 지오 튜브 상부에 기준선을 표시하고 10cm 간격으로 초기 위치점을 설정하여 계측하였다. 소파성능은 지

Mineralization of organic N is an important factor in determining the appropriate rate of organic matter application to paddy fields. A kinetic analysis was conducted for nitrogen mineralization of rice, barley, Chinese milk Ovetch (Astragalus sinicus L.; MV) and narrow leaf vetch straw in paddy soil. Nitrogen immobilization occurred rapidly and its rate increased in straw with high C/N ratio. The amount of nitrogen mineralization was rapid in the first year of rice-vetch cropping system. The rate constant (K) depended on the C/N ratio of organic matter. Mineralization of straw increased at high temperature. The amount of available N increment resulted in fast mineralization of straw, especially in rice and barley straw. Chinese milk vetch had the greatest mineralization rate at all temperatures and fertilization levels followed by narrow-leaf vetch. However, rice and barley straws with high C/N ratio immobilized the soil N at the initial incubation duration. Chinese milk vetch or narrow leaf vetch was not effectively mineralized in mixed treatments with rice or barley straw. The mineralization rate of organic matter was mostly affected by the C/N ratio of straw and temperature of incubation. Organic matter with low C/N ratio should be recommended to avoid the immobilization of soil N and the increasing mineralization rate of straw

A porous α-alumina tube of 2.5 ㎜ O.D. and 1.9 ㎜ I.D. was used as the support of an inorganic membrane. Macropores of the tube, about 150 nm in size, were plugged with silica formed by thermal decomposition of tetraethylorthosillcate at 600℃. The forced cross-flow CVD method that reactant was evacuated through the porous wall of the support was very effective in plugging macropores. The H_2 permeance of the prepared membrane was of the order of 10^-8 mol s^-1 m^-2 . Pa^-1, while the N_2 permeance was below 10^-11 mol. s^-1 . m^-2 . Pa^-1 at 600℃. This was comparable to that of silica-modified Vycor glass whose size was 4 nm.

In every reciprocal crosses of self pollination, interspecific pollination through ordinary stigma pollination of L. longiflorum and L. × elegans, pollen vigorously germinated in stigma, and pollen tube was growing. But, 5 days after pollination, pollen tube stopping their growth in the same style as was observed in the cross of self pollination and interspecific pollination. Intrastylar pollination of L. × elegans and L. longiflorum passed stylar cannal through the basal part of styles. But, pollen tube that was growing to the ovule of the ovary was extremely small. In morphogical observation of ovary 10 days after pollination, it was observed, that every reciprocal crosses of L. longiflorum × L. × elegans was fertilized through intrastylar pollination, so that this technique was used to overcome cross incompatibilities.lities.