• Bulletin of the Korean Chemical Society
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• 제4권1호
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• pp.17-25
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• 1983

The hyperfine integrals for 4d orbitals have been evaluated adopting a general method which is applicable to a general vector, R, pointing arbitrary direction in space. The operator and the spherical harmonic part of 4d orbitals are expressed in terms of R and r$_{N}$ and the exponential part, r$^{2}$exp(-2${\beta}$r), of 4d orbitals is also translated as a function of R and r$_{N}$ and then integration is performed. The radial integrals for 4d orbitals are tabulated in analytical forms. The hyperfine integrals for 4d orbitals are also represented in analytical forms, using the specific formulas of radial series which we found.

• Bulletin of the Korean Chemical Society
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• 제25권6호
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• pp.777-778
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• 2004

• Bulletin of the Korean Chemical Society
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• 제11권4호
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• pp.332-333
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• 1990

The most general algebraic Hamiltonian for vibron model of diatomic molecules is obtained by using the theorems on the Jordan Schwinger representations of Lie groups.

• 대한화학회지
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• 제53권2호
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• pp.189-201
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• 2009

이 연구의 목적은 고등학교 1학년 과학영재 학급 학생과 일반 학급 학생의 창의적 성격과 창의 적 인지력을 비교함으로써 과학 창의성이 있는 학생이 과학영재로 선발되었는지와 과학영재 학급 수 업을 통해 창의성이 향상되었는지를 알아보는 것이다. 연구를 위하여 과학영재 학급 학생과 일반 학급 학생에 대해 Khatena-Torrance 창의적 성격검사와 Torrance 창의성 검사 중 언어검사 A형을 영재 수업 전․후에 실시하였다. 연구결과, 과학영재 학급 학생이 일반 학급 학생에 비하여 창의적인 성격을 가지 고 있는 것으로 나타났으나, 창의적 인지력 면에서는 유의미한 차이를 보이지 않았다. 과학영재 학급 학생과 일반 학급 학생의 창의적 성격의 하위 요인과 창의적 인지력의 하위 요인 사이의 상관관계가 매 우 낮아, 창의적 성격과 창의적 인지력이 서로 독립적인 것으로 나타났다. 그리고 과학영재 수업 실시 후에 과학영재 학급 학생들의 창의적 성격과 창의적 인지력은 향상되지 않았다. 따라서 과학 창의성이 있는 학생을 과학영재 학생으로 선발하는 방법과 과학영재 학생의 창의성을 향상시킬 수 있는 교수-학 습 방법에 대한 연구와 개발이 필요하다.

• Advances in Traditional Medicine
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• 제6권3호
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• pp.221-231
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• 2006

The aim of the present study is to investigate central nervous system (CNS) activity of the methanol extracts of leaves of Caesalpinia bonducella (MECB) and stem bark of Bauhinia racemosa (MEBR) (Caesalpinaceae) in Swiss albino mice and Wistar albino rats. General behavior, exploratory behavior, muscle relaxant activity and phenobarbitone sodium-induced sleeping time were studied. The results revealed that the methanol extracts of leaves of Caesalpinia bonducella at 100 - 200 mg/kg and stem bark of Bauhinia racemosa 100 - 200 mg/kg caused a significant reduction in the spontaneous activity (general behavioral profile), remarkable decrease in exploratory behavioral pattern (Y-maze and head dip test), a reduction in muscle relaxant activity (rotarod and traction tests), and also significantly potentiated phenobarbitone sodium-induced sleeping time. The results suggest that MECB and MEBR exhibit CNS depressant activity in tested animal models.

• Bulletin of the Korean Chemical Society
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• 제24권3호
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• pp.306-310
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• 2003

Hydrolysis reactions of S-phenyl-S-vinyl-N-p-tosylsulfilimine (VSI) and its derivatives at various pH have been investigated kinetically. The hydrolysis reactions produced phenylvinylsulfoxide and p-toluene sulfonamide as the products. The reactions are first order and Hammett ρ values for pH 1.0, 6.0, and 11.0 are 0.82, 0.45, and 0.57, respectively. This reaction is not catalyzed by general base. The plot of k vs pH shows that there are three different regions of the rate constants $(k_t)$ in the profile.; At pH < 2 and pH > 10, the rate constants are directly proportional to the concentrations of hydronium and hydroxide ion catalyzed reactions, respectively. The rate constant remains nearly the same at 2 < pH < 10. On the bases of these results, the plausible hydrolysis mechanism and a rate equation have been proposed: At pH < 2.0, the reaction proceeds via the addition of water molecule to sulfur after protonation at the nitrogen atom of the sulfilimine, whereas at pH > 10.0, the reaction proceeds by the addition of hydroxide ion to sulfur directly. In the range of pH 2.0-10.0, the addition of water to sulfur of sulfilimine appears to be the rate controlling step.

• Bulletin of the Korean Chemical Society
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• 제31권3호
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• pp.683-688
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• 2010

A new and efficient Au-catalyzed alkoxycyclization of conjugated enynols offers a general entry to a wide range of highly substituted furans in good to excellent yields. These furans were subjected to diethyl acetylenedicarcoxylate to afford the interesting cycloadducts in good to excellent yields.

• Bulletin of the Korean Chemical Society
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• 제10권6호
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• pp.564-567
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• 1989

The use of some mono-substituted phenyl N-phenylcarbamates derivatives as corrosion inhibitors for nickel in 1M perchloric acid was studied by galvanostatic polarization. The inhibition appears to function through general adsorption isotherm. However, galvanostatic polarization data suggest that in the case of all seven inhibitors both anode are polarized under the influence of an external current. Electrocapillary measurements have also revealed that the tendency of the inhibitors tested to adsorb on metallic surface follows the same order of efficiency.

• Bulletin of the Korean Chemical Society
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• 제7권4호
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• pp.271-275
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• 1986

The Smoluchowski equation with a step potential is solved in one-dimensional case and three-dimensional case with spherical symmetry. Exact analytic expressions for the solution and the remaining probability are obtained in one-dimensional case for the reflecting boundary condition and the long time behavior of the remaining probability is compared with the earlier work. In three-dimensional case, only the long time behavior is evaluated. More general case with the radiation boundary condition is also investigated and the results are shown to approach correct limits of the reflecting boundary condition.

• Bulletin of the Korean Chemical Society
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• 제8권4호
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• pp.329-332
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• 1987

The reaction of (E)-1-alkenyl-1,3,2-benzodioxaboroles with a variety of allylic phenoxides in the presence of a catalytic amount of Pd$(PPh_3)_4$ is described. The reaction affords a general and simple procedure for the preparation of 1,4-alkadienes from alkynes via hydroboration.