• 제목/요약/키워드: Krypton

검색결과 24건 처리시간 0.026초

증발산 장기 관측에 따른 크립톤 습도계의 흡수 계수의 변화와 이슬점 생성기를 이용한 기기 보정 (Changes in Absorption Coefficient of Krypton Hygrometer in Long-term Monitoring of Evapotranspiration and Its Calibration Using a Dew Point Generator)

  • 박윤호;김준;이희춘;임종환;권원태
    • 한국농림기상학회지
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    • 제2권3호
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    • pp.75-79
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    • 2000
  • Calibrations of fast-response krypton hygrometers were carried out using a dew-point hygrometer to investigate the changes in their absorption coefficients due to long-term field operation. Absorption coefficients changed proportionally with the number of hours of field operation. The increase in absorption coefficient indicates that the water vapor flux, calculated with the original absorption coefficient, would underestimate the true flux in the field. To minimize the uncertainty in quantifying evapotranspiration and surface energy budget studies, frequent calibrations (for example, every 1500 hours of field operation) of krypton hygrometer are recommended.

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The Vacancies-in-Solid Model Applied to Sublimation Pressure, Enthalpies and Entropies of Sublimation, and Enthalpies and Entropies of Solid Krypton and Xenon

  • Ko, Seuk-Beum;Kim, Wan-Kyue
    • Bulletin of the Korean Chemical Society
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    • 제2권1호
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    • pp.17-24
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    • 1981
  • Thermodynamic properties such as sublimation pressures, enthalpies and entropies of sublimation, enthalpies and entropies of solid krypton and xenon are calculated from $0{\circ}K$ to the triple point, using the vacancies-in-solid model. The Mie-Lennard-Jones 12,6 potential in uniform potential field is used. The results are compared with the calorimetric and sublimation pressure values, and are in a good agreement with the available calorimetric and sublimation pressure values.

오피스텔 모델건물의 생애주기비용 분석에 의한 다층유리창 경제성 비교 (Comparison on the Economical Efficiency of the Multiple Glazed Windows According to Life Cycle Costing of an Officetel Model Building)

  • 정근주
    • 한국주거학회논문집
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    • 제17권4호
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    • pp.101-109
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    • 2006
  • The purpose of this study was to suggest ways on reducing the cooling and heating energy cost of the officetel building with the multiple glazing windows according to Life Cycle Costing. This study consisted of an hour-by hour energy simulation program and further data from the EnergyPlus V1-2-2 to the four pane type windows that were applied with 2 low-e polyester film and krypton gas to the officetel model building. It was determined that the four panes type windows that had 2 low-e polyester film and krypton gas applied to, them showed a cooling and heating cost reduction over traditional double glazed windows that were filled with air. According to this study, as well as the information from chart 4.5 and the LCC it was determined that the present value of the four panes of windows that had 2 low-e polyester film and krypton gas applied to them showed. a 11.4% reduction in heating and cooling in comparison to the traditional double glazed windows that were filled with air.

레늄 필라멘트와 반사 글로브를 개선한 Basking Neodymium Lamp의 개발 (Development of Basking Neodymium Lamp Improving Reflector Globe and Rhenium Filament)

  • 어익수;양해술
    • 한국산학기술학회논문지
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    • 제8권3호
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    • pp.477-482
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    • 2007
  • 본 논문은 램프의 벌브 형태 개선과 알루미늄 코팅에 의한 리플렉터 글로브의 적용으로 광을 집적하여 증가시키고, 레늄 필라멘트의 적용에 따른 장 수명과 크립톤 가스와 질소가스의 최적 주입 비율을 통한 60[W]급 Basking Neodymium Lamp 개발에 관한 것으로 이를 측광, 분석하였다. 개발결과 수명은 7,200시간, 광속은 620[1m]이며 색온도와 연색성 또한 우수한 것으로 나타나 농업용과 일반용 램프로써의 그 가능성을 확인하였다.

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초음파분해반응에 있어서 희가스의 영향 (Effects of Noble Gas on the Sonolytic Decomposition)

  • 임봉빈;김선태
    • 한국환경과학회지
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    • 제11권7호
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    • pp.749-755
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    • 2002
  • The effects of noble gas (such as helium, neon, argon, krypton, and xenon) on the sonolytic decomposition of water and 2-methyl-2-propanol(t-butanol) with 200 KHz high power ultrasound were investigated. The physical properties of the noble gas have an effect on the formation rate of products $(H_2O_2,\;H_2,\;O_2)$ and the decomposition rate on the sonolytic decomposition of water. The pyrolysis products, such as methane, ethane, ethylene, and acetylene are formed during the sonolytic decomposition of t-butanol. From the estimation of the ratio $[C_2H_4+C_2H_2] / [C_2H_6]$, the cavitation temperature would be varied by the used noble gas. In all cases for the sonolytic decomposition of water, t-butanol, and diethyl phthalate, the decomposition rates were xenon > krypton > argon > neon > helium with a significant difference and were closely correlated with the formation rate of OH radical and high temperature inside the cavitation bubble under each noble gas.

비활성 기체의 증기압 예측 (Prediction of Vapor Pressure of the Inert Gases)

  • 정재관
    • 대한화학회지
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    • 제47권6호
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    • pp.541-546
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    • 2003
  • 문헌에 보고된 기존의 비활성 기체의 증기압 측정값을 이용하여 환원증기압과 환원온도 형태의 아래와 같은 식의 상수 A, B, C, D와 지수 n을 구하는데 사용하였다: $InP_r=A+{\frac{B}{T_r}+CInT_r+DT_n^r}$ 오차분석법에 의해 위 식에 적용되는 비활성 기체의 각 기체 Ar, Kr, Xe, He과 Ne에 대한 가장 정확한 지수와 4개의 상수를 얻었다. 위 식을 통해 각 기체의 증기압을 계산하기 위해서 필요한 것은 정상 끓는점, 임계압력 및 임계온도뿐이며 5개의 비활성 기체의 406개 증기압 실험값에 적용하여 본 결과 전체 평균편차가 0.31% 였다. Ar, Kr, Xe에 대한 평균편차는 각각 0.24%, 0.09%, 0.22%였으며, Ne은 1.31%, He은 0.61%이다. 이러한 결과는 He과 연관된 큰 양자효과와 Ne에 대한 적은 양자효과 때문에 예상된 것이다.