• 농약과학회지
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• 제2권3호
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• pp.79-84
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• 1998

콩나물중 carbendazim 잔류분을 정량하고 확인할 수 있는 새로운 분석법을 확립하고자 tandem HPLC(UV & FL) 및 APcI를 source로 사용한 LC/MS를 이용하였다. 이를 위해 FL(fluorescence) 검출기를 UV(ultraviolet) 검출기와 나란히 연결하여 UV 검출기의 경우 280 nm 파장을 그리고 FL 검출기의 경우는 excitation파장과 emission파장을 각각 280 mn와 310 nm로 설정하였다. 분석결과 carbendazim의 검출한계는 $0.04{\mu}g/kg$이었다. 콩나물에 carbendazim을 0.5, 1.0 및 2.0 ppm 수준으로 첨가하여 회수율을 측정한 결과 그 평균값은 89.1%이었다. APcI source를 사용한 LC/MS 질량스펙트럼 방법은 콩나물중 carbendazim 잔류분을 최종 확인할 수 있었다. APcI LC/MS 방법은 전자충격에 의한 질량스펙트럼에 비해 훨씬 간단한 fragment를 형성할 뿐 만 아니라 carbendazim의 경우 m/z 133, m/z 159, m/z 191($M^{+}$)의 전형적인 fragment 이온을 형성하므로, 이 방법을 병행한다면 콩나물중 carbendazim 잔류분을 효과적으로 확인할 수 있을 것으로 사료되었다.

• 천문학회보
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• 제39권1호
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• pp.68.1-68.1
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• 2014

We present the results of far-ultraviolet (FUV) observations of comet C/2001 Q4 (NEAT) obtained with Far-ultraviolet Imaging Spectrograph (FIMS) on board the Korean microsatellite STSAT-1, which operated at an altitude of 700 km in a sun-synchronous orbit. FIMS is a dual channel imaging spectrograph (S-channel 900-1150 ${\AA}$, L-channel 1350-1710 ${\AA}$, and ${\lambda}/{\Delta}{\lambda}$ ~ 550 for both channels) with large image fields of view (S-channel $4.0^{\circ}{\times}4.6^{\prime}$, L-channel $7.5^{\circ}{\times}4.3^{\prime}$, and angular resolution ~ $5-10^{\prime}$) optimized for the observation of diffuse emission of astrophysical radiation. Comet C/2001 Q4 (NEAT) were made in two campaigns during its perihelion approach between May 8 and 15, 2004. Based on the scanning mode observations in the wavelength band of 1400-1700 ${\AA}$, we have constructed an image of the comet with an angular size of $5^{\circ}{\times}5^{\circ}$, which corresponds to the central coma region. Several important fluorescence emission lines were detected including S I multiplets at 1429 and 1479 ${\AA}$, C I multiplets at 1561 and 1657 ${\AA}$, and the CO $A^1{\Pi}-X^1{\Sigma}^+$ Fourth Positive system; we have estimated the production rates of the corresponding species from the fluxes of these emission lines. The estimated production rate of CO was $Q_{CO}=(2.65{\pm}0.63){\times}10^{28}s^{-1}$, which is 6.2-7.4% of the water production rate and is consistent with earlier predictions. The average carbon production rate was estimated to be $Q_C={\sim}1.59{\times}10^{28}s^{-1}$, which is ~60% of the CO production rate. However, the observed carbon profile was steeper than that predicted using the two-component Haser model in the inner coma region, while it was consistent with the model in the outer region. The average sulfur production rate was $Q_S=(4.03{\pm}1.03){\times}10^{27}s^{-1}$, which corresponds to ~1% of the water production rate.

• 천문학회보
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• 제39권2호
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• pp.78.2-78.2
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• 2014

MIRIS (Multi-purpose Infrared Imaging System) is the primary payload on the Korean science and technology satellite, STSAT-3, which was launched on 2013 November 21. It is designed to observe the near-infrared sky with a $3.67^{\circ}{\times}3.67^{\circ}$ field of view and a $51.6^{{\prime}{\prime}}{\times}51.6^{{\prime}{\prime}}$ pixel resolution. Using two narrow-band filters at $1.88{\mu}m$ (Pa ${\alpha}$ line) and $1.84+1.92{\mu}m$ (Pa ${\alpha}$ dual continuum), the Paschen ${\alpha}$ Galactic plane survey has been carrying out, and the area for the Galactic longitude from $+280^{\circ}$ to $+100^{\circ}$ (with the width of $-3^{\circ}$ < b < $+3^{\circ}$) has been covered by 2014 August 31. In this contribution, we present the preliminary results of the MIRIS Paschen ${\alpha}$ emission maps and compare them with other wavelength maps such as $H{\alpha}$ and dust maps. Many of the Paschen ${\alpha}$ features have been detected along the plane, and some of them are weak or invisible in the $H{\alpha}$ map and coincide well with dense cloud regions.