http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최강순,김구대,金昌殷 연세대학교 산업기술연구소 1977 논문집 Vol.7 No.1
. The effect of concentrations of urea and melamin resin solutions on the impregnation, thermosetting, and physical properties of the preformed gypsum body was studied to improve the mechanical strength and water resistivity of the substrate material. A maximum impregnation was obtained when the urea and melamin resin concentrations were 60% and 50%, or the viscosities were 100 cp and 200 cp, respectively. High mechanical strength of the resin impregnated gypsum was observed in this range of concentrations. The amount of residual free water in a heat-treated gypsum was found to be increasing and the mechanical strength, consequently, was found to be lowered with decreasing the resin concentration. Since the resin was considered to be absorbed only on the surface of the substrate material, water resistivity of the composite was found to be increasing up to three times of that of a hydrated gypsum, say 3 to 5%, as the concentration of the resin solution increased up to 60%.
고분자에말죤의 첨가에 따른 시멘트모르터의 특성에 관한 연구 -Polyacrylicacid Ester 및 Polystyrene 에말죤의 첨가영향-
김창은,최강순 한국세라믹학회 1975 한국세라믹학회지 Vol.12 No.4
Polymer emulsion was used as the admixture for the purpose of increasing the mechanical properties of cement mortar. The effect of polymer emulsion admixture on compressive strength and tensile strength and chemical resistance, relative humidity on compressive and tensile strength, sand particles on water absorption were studied. The results were as follows. 1. Polymer emulson modified mortar cured under 95% of realative humidity showed lower strength than the mortar cured at dry condition. 2. The maximum strength was attained at 10~20% of polystyrene and polyacrylic acid ester polymer-cement mortar. 3. The modified mortar (sand size rate (-9+35)mech:(-35+60)mech=4 : 1) was 1.5 times lower than the modified mortar (1 : 1) in water absorption. 4. Compared with the ordinary mortar, the modified mortar showed 2~3 times greater chemical resistance for 5% HCl or 5% H2SO4.
김정제,최강순,신영오,Kim, Jeong-Je,Choi, Kang-Soon,Shin, Young-Oh 한국토양비료학회 1992 한국토양비료학회지 Vol.25 No.4
산야초(山野草), 활엽수(闊葉樹)와 침엽수낙엽(針葉樹落葉)을 실험실조건하(實驗室條件下)에서 90일간(日間) 부숙(腐熟)시키면서 경시적(經時的)으로 시료(試料)를 채취(採取)하여 산가수분해(酸加水分解)시킨후 6개(個)의 저분자량(低分子量)의 유기산(有機酸)을 분석(分析)한 결과(結果)는 다음과 같다. 1. Formic, acetic, succinic, malic, tartaric와 citric acid가 검출(檢出)되었으며 이중(中) malic acid는 전시료중(全試料中)에서 극(極)히 미량(微量)으로 함유(含有)되어 있었다. 2. 산야초(山野草)의 경우 저분자량(低分子量) 유기산(有機酸)의 농도(濃度)는 부숙기간(腐熟期間)이 경과(經過)함에 따라 감소(減少)했으며 formic acid와 acetic acid등(等) monocarboxylic acid는 dicarboxylic acid와 tricarboxylic acid에 비(比)해 훨씬 높은 농도(濃度)를 보였고 formic acid와 acetic acid는 상호보충(相互補充) 관계(關係)가 있었다. Citric acid는 부숙기간(腐熟期間)이 경과(經過)함에 따라 농도(濃度)가 증가(增加)하였다. 3. 활엽수낙엽(闊葉樹落葉)의 경우 부숙기간(腐熟期間)이 경과(經過)함에 따라 monocarboxylic acid농도(濃度)가 상대적(相對的)으로 높았다. Formic acid와 acetic acid사이는 상호보충(相互補充) 관계(關係)가 있음이 구명(究明)되었다. 4. 침엽수낙엽(針葉樹落葉)의 경우 부숙기간(腐熟期間)이 경과(經過)함에 따라 유기함유량(有機含有量)의 변화(變化)가 별(別)로 나타나지 않았다. 산야초(山野草)와 활엽수낙엽(闊葉樹落葉)과는 대조적(對照的)으로 dicarboxylic acid인 succinic acid농도(濃度)가 가장 높았다. Changes in the concentrations of six low-molecular-weight organic acids extracted from hydrolysates of plant residues undergoing decomposition for 90 days under the laboratory condition were investigated. 1. Litters of deciduous and coniferous trees and wild grass cuttings were sampled for the study and concentrations of formic, acetic, succinic, tartaric, malic and citric acids were determined. The concentration of malic acid were negligible. 2. In the wild grass cuttings, the total concentration of low-molecular-weight organic acids decreased with the passage of decomposition. Monocarboxylic acids, I. e., formic and acetic acids, predominated over dicarboxylic and tricarboxylic acids. Formic and acetic acids appeared to be compensatory for each other. Concentration of citric acid increased at a remarkable rate. 3. The total concentration of organic acids in the hydrolysates of deciduous litter was shown to increase. The concentration of monocarboxylic acids was significantly higher in the end of the period of decomposition. Here again a compensatory relationship was observed between concentrations of formic and acetic acids. 4. There was comparatively little change exhibited during the period of experiment concerning the concentrations of organic acids from hydrolysates of decomposing coniferous litter. In contrast with the others, however, the concentration of succinic acid, a dicarboxylic acid, maintained the highest level.