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Effect of Mixture Flow Rate on Emission Characteristics of Laminar Premixed CH4/Air Flame with Changing Combustor Pressure

  • Ma, Hai-quan;Song, Jae-hyeok;Kang, Ki-joong;Choi, Gyung-min;Kim, Duck-jool
    • 한국연소학회:학술대회논문집
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    • 2012.04a
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    • pp.269-271
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    • 2012

  • To investigate emission characteristics of laminar premixed CH4/air flame, combustion experiments were conducted at three flow rates (5.3L/min, 10.6L/min, 15.5L/min) with changing the combustor pressure(-30Kpa-30Kpa). It was found that with increasing flow rate, NOx emission increased in high pressure condition, while decreased in low pressure condition; and the emission of CO decreased with increasing flow rate. For the influence of pressure, emission of NOx increased with increasing pressure regardless of flow rates, while CO emission decreased on the contrary.

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Dimerization of Thyroglobulin in the Endoplasmic Reticulum (Thyroglobulin의 소포체내 dimerization)

  • 권오유;신기선
    • Journal of Life Science
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    • v.13 no.3
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    • pp.248-251
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    • 2003

  • The kinetics of dimerization of a newly synthesized thyroglobulin (Tg), the precursor protein in the manufacture of thyroid hormone, was investigated in the endoplasmic reticulum of thyrocytes FRTL-5 cell line. The folded monomeric Tg was first detectable in a conformationally unstable form, from the examination of lysates of pulse labeled cultured thyrocytes by denaturing and nondenaturing gel electrophoresis by 15 min after biosynthesis. The first dimeric Tg was formed by 30 min after; the monomer declined and the dimer progressively increased, and 40 min after remarkable dimeric Tg form was found. Finally, dimerization was complete at 60 min after.

  • https://doi.org/10.5352/JLS.2003.13.3.248 인용 PDF KSCI

Determination of VOC in aqueous samples by the combination of headspace (HS) and solid-phase microextraction (SPME) (HS-SPME 방식에 기초한 물 중 VOC 성분의 분석기법에 대한 연구: 3가지 실험 조건의 변화와 분석감도의 관계)

  • Park, Shin-Young;Kim, Ki-Hyun;Yang, H.S.;Ha, Joo-Young;Lee, Ki-Han;Ahn, Ji-Won
    • Analytical Science and Technology
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    • v.21 no.2
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    • pp.93-101
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    • 2008

  • The application of solid phase microextraction (SPME) is generally conducted by directly immersing the fiber into the liquid sample or by exposing the fiber in the head space (HS). The extraction temperature, the time of incubation, and application of stirring are often designated to be the most important parameters for achieving the best extraction efficiencies of HS-SPME analysis. In this study, relative importance of these three analytical parameters involved in the HS-SPME method is evaluated using a polydimethylsiloxane/carboxen (PDMS/CAR) fiber. To optimize its operation conditions the competing relationships between different parameters were investigated by comparing the extraction efficiency based on the combination of three parameters and two contracting conditions: (1) heating the sample at 30 vs. 50 C, (2) exposing samples at two durations of 10 vs. 30 min, and (3) application of stirring vs. no stirring. According to our analysis among 8 combination types of HS-SPME method, an extraction condition termed as S50-30 condition ((1) 1200 rpm stirring, (2) $50^{\circ}C$ exposure temp, and (3) 30 min exposure duration) showed maximum recovery rate of 45.5~68.5% relative to an arbitrary reference of direct GC injection. According to this study, the employment of stirring is the most crucial factor to improve extraction efficiency in the application of HS-SPME.

  • https://doi.org/10.5806/AST.2008.21.2.093 인용 PDF KSCI