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洛東江 水質汚染에 따른 淨水處理 改善에 關한 硏究(II)
李哲熙,朴永圭,金水源,具本大 嶺南大學校 環境問題硏究所 1981 環境硏究 Vol.1 No.1
The algae content in the Nackdong river water, which is used as source of water works in Daegu city and carries a pollution load of domestic and industrial wastewater, rises in the warm season to such a level that calls for a improvement process for water treatment. A pilot plant study on the efficiency of the removal of algae by dissolved air flotation was conducted and the results are summarized as follows: 1. Algae concentration in the raw water is the highests in April, May and September below 25 NTU of raw water turbidity. In these dry months, the production of treated water decreases by the conventional water treatment process. 2. The average efficienct of algae removal could be achieved at 96% using coagulants, such as alum or PAC at dissolved air flotation. In the conventional sedimentation process, algae can be removed by only 88% and produces chlorinated organic compounds after breakpoint chlorinatioin. 3. It is required that the ideal flotation area is 7,106㎡ and the detention time is 20 min for treated water of 250,000㎡ /day.
이익춘,이본수 서울대학교 1972 서울대학교 論文集 Vol.22 No.-
The volume and compressibility of activation at atmospheric pressure for various reactions were evaluated by the graphical method which was applied to ionic equilibrium by Lord Wynn-Jones, and reaction-mechanisms were discussed on the basis of these quantities. It was ascertained that compressibility of activation is more favorable than volume of activation for discussing reaction mechanisms. Expansibility of activation was also calculated for a few cases.
Hyun, Kwan-Hoon,Kwack, In-Young,Lee, Do-Young,Park, Hyung-Yeon,Lee, Bon-Su,Kim, Chan-Kyung Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.12
Ligand-based quantitative structure-activity relationship (QSAR) studies were performed on indolinones derivatives as a potential inhibitor of the protein tyrosine kinase of fibroblast growth factor receptor (FGFR) by comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) implemented in the SYBYL packages. The initial X-ray structure of docked ligand (Su5402) to FGFR was used to minimize the 27 training set molecules using TRIPOS force field. Seven models were generated using CoMFA and CoMSIA with grid spacing 2 ${\AA}$. After the PLS analysis the best predicted CoMSIA model with hydrophobicity, hydrogen bond donor and acceptor property showed that a leave-one out(LOO) cross validated value $({r^2}_{cv})^$ and non-cross validated conventional value $({r^2}_{ncv})^$ are 0.543 and 0.938, respectively.
Bon-Su Lee,Chang Kon Kim,Ikchoon Lee Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.5
The gas-phase pyrolysis reactions of iminoethers (Ⅱ), 2-alkoxypyridines (Ⅲ), 2-N-alkylated pyridones (Ⅳ) and N-alkylated acetamides (Ⅴ) have been studied MO theoretically with the AM1 method. The decomposition of these compounds proceeds by a concerted retro-ene process through a six-membered cyclic transition state. The reactivity decreases in the order (Ⅱ) > (Ⅲ) > (Ⅳ) > (Ⅴ), with a greater reactivity for the imine series, (Ⅱ) and (Ⅲ), compared to the amide series, (Ⅳ) and (Ⅴ), and a difference in basicity between the N and O atoms. Within a given series, however, the reactivity is dictated mainly by the aromaticity in the transition state. The reactivity order with respect to side alkyl chain of a species was found to increase as the steric crowding effect increases. The AM1 reactivity in this work agree well with the experimental results.
Lee, Ik-Choon,Lee, Byung-Choon,Lee, Bon-su,Sohn, Se-Chul Korean Chemical Society 1985 Bulletin of the Korean Chemical Society Vol.6 No.1
Solvolysis of 1-adamantyl chloride, -bromide and -tosylate have been studied in methanol-acetonitrile mixtures. Rate maxima were found for 1-adamantyl bromide and tosylate at 80-90 % methanol mixtures. The rate maximum observed was interpreted as a result of cooperative enhancement of cation and anion solvation. 1-Adamantyl tosylate had small cation solvation but had extensive anion solvation. It was concluded that the Y scale based on adamantyl tosylate is superior to others since it varies in a wide range especially for weakly ionizing medium.
Halogen Exchange Reactions of Cinnamyl Halides
Lee, Bon-Su,Lee, Ikchoon Korean Nuclear Society 1969 Nuclear Engineering and Technology Vol.1 No.2
Halogen exchange reactions of trans-cinnnamyl chloride and bromide with radioactive chloride, bromide and iodide ions in acetone have teen studied. Relative nucleophilicity of halide ions and relative leaving ability have been discussed invoking the principle of HSAB.
Lee, Ik-Choon,Koh, Han-Joong,Lee, Bon-Su,Lee, Hai-Whang,Choi, Jae-Ho Korean Chemical Society 1990 Bulletin of the Korean Chemical Society Vol.11 No.5
Primary and secondary ${\alpha}$-deuterium kinetic isotope effects are determined with deuterated aniline nucleophiles in the nucleophilic substitution reactions of benzyl benzenesulfonates and 1-phenylethyl benzenesulfonates in acetonitrile at 30.0^{\circ}C. The $k_H/k_D$ values support our previous conclusions regarding the transition state structures proposed for the two reactions based on the cross-interaction constants ${\rho}_{ij}$; the former is a typical $S_N2$ reaction whereas in the latter the four-center transition state may be involved.