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액스선 형광에 의한 Ni-Fe-Cr계의 내부조직 효과에 관한 연구
예진해 安東大學 1985 安東大學 論文集 Vol.7 No.1
The purpose of this study is to obtain X-ray absorption-enhancement coefficient of the matix by use of metallic oxides mixtuse so that both constituent and composition can be easily varied and to examine applicability of these coefficient to metallic ingot samples for composition measurements. Instead of using the coefficient obtained from the ingots, competition of alloy ingots and powdered oxide termary have been calculated by usage of the coefficients of obtained from the oxide binany mixture and the concentration are found to be within 2.2~4.5% of relative errors.
예진해 安東大學 1986 安東大學 論文集 Vol.8 No.1
X-ray fluorescence analytical technique is well known method for nondistructive analysis of metallic alloyes. X-ray intensity from some element in a matrix of other elements is not linear with composition because of selective absorption or secondary fluorescence within the specimen (matrix effect). The purpose of this study is to obtain X-ray absorption enhancement coefficient of the matrix by use of metallic oxides powdered mixture so that both constituent and composition can be easily varied and to examine applicability of these coefficients to metallic ingot samples for composition measurments.
액스선 형광분광법에서 매트릭스효과를 보정하기 위한 실험계수 이용법
예진해 安東大學 1989 安東大學 論文集 Vol.11 No.1
The matrix effect should be reduced to the mininum in order to examine the proper contents of analytic elements in the X-ray spectro-analytic method. To reduce this matrix effect, a formular is established in relation to several factors such as the X-ray fluorescent intensity of a certain element in a well -known sample, the contents of the element, the reflex-principle of X-ray radiation, and the characteristic that the adjacent matrix teduces or increases the analytic line intensity in proportion to the differences in the mass absorption coefficient of each element. The process in which the matrix effect coefficient is derived from this formular and the method of using this coefficient by which the contents of an unknown elements can be discovered are discussed.
전이금속 착물의 전자구조 및 화학적 반응성 (제25보) trans-[Cr(3,3,3-tet)Br_(2)]^(+)의 수화반응에 미치는 용매효과
최종하,예진해 안동대학교 기초과학연구소 1998 基礎科學 硏究論文集 Vol.9 No.1
The rate constants for the solvolysis of trans-[Cr(3,3,3-tet)B_(2)]^(+) ion were determined by the spectroscopic method in methanol-, ethanol-, acetone-, and acetonitrile-water mixtures at 30℃. Activation parameters were calculated from the rate constants by the transition state theory. The rate constants for the solvolysis increasing co-solvent composition. The variation of the rate constant was not consistent with the variation of dielectric constant. The plot of log kobs against Grunwald-Winstein Y values with gradients of 0.135, 0.161, 0.0976 and 0.144 in methanol-, ethanol-, acetonitrile-, and acetone-water mixtures respectively. A free energy cycle for the process from the initial state to the transition state in water and in water+co-solvent mixtures shows that the changes in salvation of the transition state have a dominate effect on the rate. From the above results, we may deduce that the mechanism for the equations of the trans-[Cr(3,3,3-tet)Br_(2)]+ is the Id mechanism.
전이금속 착물의 전자 구조 및 화학적 반응성 (제27보) trans-[Cr(AA)_(2)F_(2)]+(AA=tn, ptn)의 전자전이와 리간드장 해석
최종하,예진해 안동대학교 기초과학연구소 1999 基礎科學 硏究論文集 Vol.10 No.1
The electronic d-d spectra of trans-[Cr(AA)_(2)F_(2)]^(+)(AA=tn, ptn) complexes have been interpreted in terms of the ligand field theory. The band maxima are fitted with secular determinant for quartet state energy of d^(3) configuration in tetragonal field including configurational but neglecting spin-orbit coupling. A spectral fitting computer program is used to minimize the differences between the calculated and the observed positions for the spin-allowed transition bands. The crystal field parameters are directly related to the normalized spherical harmonic hamiltonians, angular overlap and semiempirical parameters. Values of the various ligand field parameters have been obtained and discussed from the point of view their chemical significances. The results derived from the analysis of the electronic spectra allow us to determine the energy levels of d-orbital and quartet state of trans-[Cr(AA)_(2)F_(2)]^(+) complexes. According to the results of ligand field analysis, it is confirmed that nitrogen atoms of the tn and ptn ligands have a strong σ-donor character, also fluoride ligand has very strong σ- and χ-donor properties toward chromium(III) ion.
나도성,예윤해,박진환 慶熙大學校 레이저 工學硏究所 1995 레이저공학 Vol.6 No.-
The possibility of multiplexed FP(Fabry-Perot)-interferometric intrusion sensing system was investigated. Two series-connected FP interferometers whose cavity lengths are much longer than source coherence length are interrogated by an FP-type laser diode with the help of compensating interferometer. Preliminary results with 20 meters-long FP interferometers buried 10~30㎝ deep in sand showed the sensitivity of 19.9~23.0 Pa/fringe in wet sand and 41.6 Pa/fringe in dry sand.