• Title/Summary/Keyword: earth environment

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EFFECT OF SOIL TEXTURE ON SURFACTANT-BASED REMEDIAT10N OF HYDROPHOBIC ORGANIC-CONTAMINATED SOIL

  • Lee, Dal-Heui;Robert D. Cody;Kim, Dong-Ju
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2001.04a
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    • pp.22-25
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    • 2001
  • 본 연구는 소수성 유기물로 오염된 토양의 계면 활성제를 이용한 복원에 토양의 조성이 미치는 영향에 대한 것으로서, 토양의 조성에 따른 배치실험 및 주상실험을 실시하였다. 복원 정도는 clay 함량에 따라 대우 달랐으며, clay 함량이 34% 미만일 때 복원율이 높았음을 보여주었다. 또한 clay 함량이 68% 이상일 때에는 복원율이 매우 낮았다.

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Application of an Optimization Method to Groundwater Contamination Problems

  • Ko, Nak-Youl;Lee, Jin-Yong;Lee, Kang-Kun
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2002.09a
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    • pp.24-27
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    • 2002
  • The optimal designs of groundwater problems of contaminant containment and cleanup using linear programming and genetic algorithm are provided. In the containment problem, genetic algorithm shows the superior feature to linear programming. In cleanup problem, genetic algorithm makes reasonable optimal design. Un this study, it is demonstrated through numerical experiments that genetic algorithm can be applied to remedial designs of groundwater problems.

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Global MHD Simulation of the Earth's Magnetosphere Event on October, 1999

  • PARK KYUNG SUN;OGINO TATSUKI
    • Journal of The Korean Astronomical Society
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    • v.34 no.4
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    • pp.317-319
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    • 2001
  • The response of the earth's magnetosphere to the variation of the solar wind parameters and Interplanetary magnetic field (IMF) has been stud}ed by using a high-resolution, three-dimension magnetohydrodynamic (MHD) simulation when the WIND data of velocity Vx, plasma density, dynamic pressure, By and Bz every 1 minute were used as input. Large electrojet and magnetic storm which occurred on October 21 and 22 are reproduced in the simulation (fig. 1). We have studied the energy transfer and tail reconnect ion in association with geomagnetic storms.

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Hardness Prediction and First Principle Study of Re-123(Re = Y, Eu, Pr, Gd) Superconductors

  • Liu, Weiwei;Zhou, Y.P.;Feng, X.L.
    • Bulletin of the Korean Chemical Society
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    • v.30 no.12
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    • pp.3016-3020
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    • 2009
  • The chemical bond parameters of Y-123, Eu-123, Pr-123 and Gd-123 compounds have calculated using the chemical bond theory of complex crystals. Their hardness have been predicted by the chemical bond definition of hardness. The calculated results indicate that the Ba-O and RE-O types of bond have a lower covalent character and the Cu-O types of bond have greater covalency. The hardness values increase as the unit cell volume of the rare earth superconductor structures decrease.