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극미세 입자 Aluminosilicate 계 졸의 합성 및 응용 : (Ⅰ) SiO₂및 γ-AIOOH졸의 제조 및 케릭터라이제이션
현상훈,송재권,강범석 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1
Nanoparticulate silica sols could be synthesized by an interfacial hydrolysis reaction between TEOS and high alkaline water. The silica sols were extremely stable at pH of 8 and their average particle sizes were less than 3 nm, while very unstable between 4 and 5 of pH. The sol particles grew up to about 10 nm within 1 day in the region of pH less than 7. It was found that the silica sol with pH less than 2 was stabilized without further growing after 1 day-aging. The particle size of γ-AlOOH sols synthesized via the modified Yoldas-method could be controlled according to the mole ratio of nitric acid/aluminium tri-sec-butoxide(0.07∼1.0). The stable γ-AlOOH sol with the average particle size of 45 nm, which was prepared using the mole ratio of 0.07, was estimated to be suitable for coating reproducible γ-AlOOH membrane layers with the high specific surface area.
현범수 韓國海洋大學校 附設 海洋科學技術硏究所 1998 硏究論文集 Vol.7 No.-
해양오염 사고시 유출유의 수거를 위하여 사용되는 유회수기에 대하여 고찰하였다. 논문의 주요 내용은 (1) 유회수기의 종류, 장단점, 성능지표 및 시장현황에 대한 개괄적인 설명과 (2) 유회수 성능에 영향을 미치는 인자들에 대한 고찰, 그리고 (3) 유회수기 분야에 대하여 현재까지 발표된 논문들에 대한 핵심 아이디어들을 소개하였다. 끝으로 (4) 유체역학적 관점에서 본 유회수기의 특성과 해양, 토목, 기계등 유사관련분야의 연구결과가 유회수기 해석에 어떻게 이용될 수 있는지에 대하여 고찰하였다. The hydrodynamic characteristics of oil skimmers are reviewed. The paper consists of (1) introduction of the general aspects of oil skimmers, including kinds, performance indices, current market situations, (2) the analysis of factors affecting oil-skimming, (3) the review of existing papers with a special focus on hydrodynamic problem and finally (4) conclusions and some suggestions. The purpose of this paper is to draw hydrodynamists' attentions on oil skimmer, more broadly on marine oil spill.
벼 乾畓直播栽培에서 Propyl Dihydro Jasmonate 種子處理에 따른 出芽 및 生育促進效果
박종현,이철원,송범헌,손석용 忠北大學校 農業科學硏究所 2003 農業科學硏究 Vol.20 No.-
This study was conducted to examine the effects of Propyl Dihydro Jasmonate on the growth responses, chilling tolerance and yields on the direct seeding on dry paddy at seedling stage in two rice cultivars The emergence rate of two rice cultivars (Seoan byeo and Dasanbyeo) were increased more by the treatment of 0.05μM PDJ than those of others. Higher concentration of PDJ was found to be inhibitory for germination. Number of emergence of cultivar Seoanbyeo was higher in 0.05μM PDJ treatment for 24hour as compared to 12hour, whereas, no significant difference was observed in case of cultivar Dasanbyeo Plant height and number of tillers of two rice cultivars were increased by the treatment of 0.05μM PDJ for 24 hour Rice yield of the tested cultivars were increased high in the PDJ treatment plot due to increment of the panicle number in the dry seesed paddy field.
조현이,정종철,김호성,최재욱,성대경,서지훈,김성범,이계혁 大韓顎顔面成形再建外科學會 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1
Osteosarcoma is a primary malignant tumor arising most often in the long bone, but rare in jaw bone. Especially osteogenic sarcoma of the mandible is a rare tumor, comprising less than 0.5% of all head and neck tumors. Osteosarcoma occurs cheifly in young persons, and presenting very survival rates. Histopathologically this tumor can be classified three types, osteoblastic, fibroblastic, chondroblastic and classified from low grade to high grade by anaplasia or mitosis of the tumor cells. Sometimes, the exact diagnosis of osteosarcoma is difficult especially in low grade osteosarcoma, even if clinical or radiographical findings suggest to osteosarcoma. So suspcious to malignant bone tumor in clinical or radiological findings, biopsy should be taked from deep portion and multiple area, and sharing the patient history and radiographs with pathologist will assist in the development of the diagnosis. We report a case of low grade osteosarcoma on the mandible initially difficulty in accurate diagnosis. The patient visited our hospital for routine dental treatment but radiographic findings displayed ill-defined radiolucency with osteoid formation on the mandible. Final diagnosis was difficulty in initial biopsy but subsequent biopsy taked from deep portion presented infiltrative growth and mitosis of the tumor cell in some area with small osteoid bone formation, so we could reach final diagnosis as low grade sarcoma. We treated this patient with bloc resection of the mandible and immediate reconstruction with iliac corticocancellous block.
무전해법에 의해 생성된 비정질 Ni_(87.0)P_(13.0) 박막의 부식특성 : 염 수용액과 pH를 중심으로 under salt and pH
최순범,김현구 조선대학교 기초과학연구소 2003 自然科學硏究 Vol.26 No.-
We were carried out to measure corrosion potential corrosion current density. corrosion rate and corrosion resistance on polarization curves in variation temperatures for the amorphous N_157 P film. The results were particularly examined to identify the influences affecting the corrosion potential including various conditions such as temperatures concentrations and pH. The potentiodynamics parameters of the corrosion were obtained using a Tafel plot The charge transfer coefficient (α) was determined from the Tafel equation and the α was 0.99 in 7×10^-3 sodium chloride aqueous solution