• Title/Summary/Keyword: 스코리아

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Fake Limestone Cave of Geon-Ji Gul Accompanied with Lava-calcification (용암석회질화가 수반된 위종동 건지굴)

  • Soh, Dea-Wha;Hong, Young-Ja;Soh, Hyun-Jae
    • Journal of the Speleological Society of Korea
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    • no.77
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    • pp.31-42
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    • 2007
  • 북제주군 협재리 해안가 인근에 소재한 건지굴을 대상으로 화산지역의 용암동굴에서 특이하게 진행되고 있는 응암석회질화(鎔岩石灰質化: lava-calcification)의 위종동(僞鐘洞)에 대하여 동굴내부와 주변상황에 근거한 분석, 고찰을 통하여 석회질화의 원인을 규명하고, 생태와 환경 및 동굴해안접경구와의 상관성을 고찰하고, 주위에 흔히 분포되어있는 스코리아에 대해 분석응용을 하였다. 용암(화산)동굴은 생성이후 퇴화한다. 그러나 용암동굴에서 용암석회질화의 위종동 현상이 발생하면 용암의 기공과 균열부분 또는 용암석간의 공극에 석회질 성분이 침투, 고화, 융합되면서 구조적 보강효과의 발생으로 오히려 건축구조물의 콘크리트 역할과 같이 견고하게 진행되는 특이현상을 갖는다. 이와 같은 진행성 용암석회질화 현상이 북제주군 협재리에 소재한 건지굴에서 진행되고 있음을 최초로 확인하였다.

창립회원사

  • Korea Electrical Manufacturers Association
    • 전기산업
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    • v.14 no.11
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    • pp.20-26
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    • 2003
  • PDF

Volcanic Forms and Eruption Processes of Laoheishan and Huoshaoshan in the Wudalianchi Volcanics, NE China (중국 오대연지 라오헤이산과 후오샤오산의 화산 형태와 분출 과정)

  • Hwang S.K.;Jin X.;Ahn U.S.
    • The Journal of the Petrological Society of Korea
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    • v.14 no.4 s.42
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    • pp.251-263
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    • 2005
  • Modern volcanoes, Laoheishan and Huoshaoshan, have erupted during $1720\~1721$ in the Wudalianchi volcanic group, NE china. They comprise scoria and spatter cones that consist of potassium-rich phono-tephritic pyroclastic deposits and lavas, and include wide lava flow fields. The Laoheishan scoria cone is a polygenetic multiple volcano that overlaps earlier and later edifices with more complicated internal structures produced in greater scale and in earlier time than the Huoshaoshan. There is a funnel-shaped crater in the center of the later edifice of the Laoheishan scoria cone. The Huoshaoshan spatter cone is a monogenetic simple volcano with a central pit crater. The volcanic sequences indicate eruption processes that followed a repeated pattern that progressed through 5 stages of explosive and effusive eruption including lava fountains and Strombolian eruptions in the Laoheishan, and a recognizable pattern of 2 stages that started with Strombolian eruption and progressed through lava effusion in the Huoshaoshan.

Sterilization of Scoria Powder by Corona Discharge Plasma (코로나 방전 플라즈마를 이용한 화산암재 분말 살균)

  • Jo, Jin Oh;Lee, Ho Won;Mok, Young Sun
    • Applied Chemistry for Engineering
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    • v.25 no.4
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    • pp.386-391
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    • 2014
  • Atmospheric-pressure nonthermal corona discharge plasma was applied to the sterilization of biologically contaminated scoria powder. Escherichia coli (E. coli) culture solution was uniformly sprayed throughout the scoria powder for artificial inoculation, which was well mixed to ensure uniformity of the batch. The effect of the key parameters such as discharge power, treatment time, type of gas and electrode distance on the sterilization efficiency was examined and discussed. The experimental results revealed that the plasma treatment was very effective for the sterilization of scoria powder; 5-min treatment at 15 W could sterilize more than 99.9% of E. coli inoculated into the scoria powder. Increasing the discharge power, treatment time or applied voltage led to an improvement in the sterilization efficiency. The effect of type of gas on the sterilization efficiency was in order of oxygen, synthetic air (20% oxygen) and nitrogen from high to low. The inactivation of E. coli under the influence of corona discharge plasma can be explained by cell membrane erosion or etching resulting from UV and reactive oxidizing species (oxygen radical, OH radical, ozone, etc.), and the destruction of E. coli cell membrane by the physical action of numerous corona streamers.

Runoff Characteristics of a Small Catchment in Eoseungsaeng-oreum, Jeju Island (제주도 스코리아콘의 유출 특성 - 어승생오름 소유역을 사례로 -)

  • KIM, Taeho;AN, Junggi
    • Journal of The Geomorphological Association of Korea
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    • v.15 no.2
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    • pp.55-65
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    • 2008
  • In order to examine the runoff characteristics of scoria cones in Jeju Island, hydrological observations were conducted in the experimental basin (5.1 ha) of Eoseungsaeng-oreum which has been predominantly covered with Carpinus laxiflora and Quercus serrata. Although runoff has continuously occurred during the observed period, the baseflow gradually increased from April and decreased from October. The peak flow approximately corresponded to every rainfall events except for the rainfall events which has slight total precipitation and no previous precipitation. The experimental basin shows flash runoff response and short lag time; the mean lag time is 35.8 minutes. Although the runoff ratio of quick flow is proportional to total precipitation, the increasing rate is low and the maximum runoff ratio is 24.7%. In addition, the runoff ratio is less than 1% in 68.3% of the rainfall events, suggesting that the portion of quick flow to total precipitation is low. The rainfall events with relatively long event time demonstrated a secondary peak generated by translatory flow. The runoff characteristics seem to be related to local impermeable beds in the experimental basin.