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수용성 미셀용액에 가용화된 9-Methylanthracene의 평균 미세환경의 성질
朴哲浩,高正秀,吳世雄 木浦大學校 基礎科學硏究所 1993 基礎科學硏究誌 Vol.11 No.-
The average microenvironmental polarity of 9-MA which was solubilized in a micellar solution was estimated by UV spectroscopic characteristics sensitive to the polarity of solvent. When 9-MA was solubilized in aqueous CTAB, SDS, and Brij 35 solutions, its microenvironmental polarity parameter showed little dependence on the ionic properties of the micelles. The average microenvironmental polarity of 9-MA was similar to the polarity of mixed solvents between 50%(W/W) methanol-water mixture and 40%(w/w) methanol-water mixture. It was found that the greater part of 9-MA might be distributed at the surface of micelles when it was solubilized in aqueous micellar solutions.
Park, Chul-Woung,Lee, Dong-Hoon,Kim, Bong-Hak,Park, Seung-Nam,Shin, Hyun-Dong Springer-Verlag 2006 Metrologia Vol.43 No.1
<P>We have improved the accuracy in source-based calibration of radiative heat flux sensors by considering the temperature non-uniformity of the blackbody cavity. The method measures the responsivity of a heat flux sensor as a function of distance from the blackbody aperture. From this variation of the responsivity, the temperature distribution and the effective emissivity of the blackbody can be determined via a Monte Carlo simulation. The calibration uncertainty is evaluated to be 2.3% (<I>k</I> = 2) for irradiance values up to 10 kW m<SUP>−2</SUP> at a blackbody temperature around 2900 °C. In order to verify the accuracy improvement, the results are compared with those of a detector-based calibration, which demonstrated an agreement within the uncertainty.</P>
Park, Chul Woung,Kim, Bong Hak,Lee, Dong-Hoon,Park, Seung Nam Springer-Verlag 2005 Metrologia Vol.42 No.1
<P>A nickel carbon eutectic point was realized by a radiation thermometer for two geometrically different fixed point cells made by an optimized filling process. The process was based on monitoring the variation of the melting–freezing temperature difference as a function of the filling ratio of the cell. The integrity of construction and the filling endpoint could be confirmed by observing a clear convergence of the melting–freezing temperature difference as the filling ratio increases. From 14 sets of realizations with two different cells and two different spectral bands of the radiation thermometer, the eutectic temperature is determined to be 1328.73 ?C with an expanded uncertainty of 0.22 ?C (<I>k</I> = 2).</P>
레이저 유도 격자 분광장치 제작 및 C₃H8 화염에서 열 격자 측정
박철웅(Chul Woung Park),한재원(Jae Won Hahn),이중재(Joong-Jae Lee),이영우(Young-Woo Lee),고동섭(Dong-Seob Ko) 한국광학회 2001 한국광학회지 Vol.12 No.6
레이저 유도 격자 분광장치를 제작하여, C₃H_8 층류 확산화염에서 생성된 열 격자 신호를 측정하였다. 열 격자를 생성시키기 위한 여기광은 파장이 532 ㎚인 Nd:YAG 레이저를 사용하였고, 검침광은 488 ㎚의 CW Ar+ 레이저를 이용하였다. 검침광의 세기를 변화시켜 장치의 회절효율과 신호 특성을 측정하였다. 측정된 열 격자 신호의 세기를 분석하여 화염내의 매연의 농도 분포를 정성적으로 측정하였고, 신호의 주파수 변화를 측정하여 온도 분포를 구하였다. We made a laser induced grating spectrometer(LIGS) and measured the thermal grating signal generated in a C₃H_8 flame. The thermal grating was formed in the C₃H_8 flame with two second-harmonic Nd:YAG pulse laser beams, and an LIGS signal was generated by Bragg scattering of a probe laser beam Ar+ laser(488 ㎚). We found the modulation period of the signal depends linearly on the spacing of the grating set in the flame. We determined flame temperature by fitting the modulated signal and soot concentration with signal strength. Using this technique, we also obtained temperature profile and soot-particle distribution in a C₃H_8 flame.