• Title/Summary/Keyword: 그라스만

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Evaluation of dynamic fracture characteristics for advanced glass ceramics using strain gage method (스트레인게이지법을 사용한 그라스세라믹의 동적 파괴특성평가)

  • Rho Nam-Su;Kim Jae-Hoon;Lee Young-Shin;Kim Duck Hoi;Moon Soon-Il
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.112-115
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    • 2005

  • The objectives of this study are to evaluate the dynamic fracture toughness of advance glass ceramics(MACOR glass-filled ceramic, Corning Glass Works) for dome port cover of the ramjet. Static and dynamic fracture toughness tests are performed using strain gage method in the variation of notch radii.

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Low temperature solution growth of silicon on foreign substrates (이종기판을 사용한 저온에서의 실리콘 박막 용액 성장법)

  • Soo Hong Lee;Martin A. Green
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.4 no.1
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    • pp.42-45
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    • 1994

  • Deposition of silicon on pretreated sapphire and glass substrates has been investigated by the solution growth method at low temperatures. An average 14 $\mu\textrm{m}$ thickness of silicon was grown over a large area on sapphire substrate originally coated with a much thinner silicon layer [0.5 $\mu\textrm{m}$ (100) Si/(1102) sapphire)] at low temperatures from $380~460^{\cire}C$. Successful results were obtained from surface treated glass substrates in the temperatures range from $420~520^{\circ}C$.

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Structure Elucidation of Sesquiterpenoid from Pathogenic Fungus Bipolaris cynodontis (식물 병원균 Bipolaris cynodontis로부터 분리한 세스퀴테르펜류 화합물의 구조 분석)

  • Lim, Chi-Hwan
    • Analytical Science and Technology
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    • v.9 no.1
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    • pp.107-111
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    • 1996

  • A phytotoxic compound was isolated from a culture of Bipolaris cynodontis, a fungus pathogenic to Bermuda grass. The structure was determined by spectroscopic analyses including 2D NMR experiments, to be sesquiterpene having a 9-carbon unit side chain. The compound inhibits the root growth of the seedlings of Italian ryegrass and rice plant, the host plant of the B. cynodontis, by about 100% at 100ppm, and it is suggested that this may play an important role in the expression of the disease symptom.

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서로 다른 형태의 질소 공급에 의한 페레니얼 라이그라스 (Lolium perenne L.)의 생산성과 재생활력에 미치는 영향

  • 조준현;차준영;김병호;김태환
    • Proceedings of the Korean Society of Grassland Science Conference
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    • 1999.06a
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    • pp.89-90
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    • 1999

  • 페레니얼 라이그라스(Lolium perenne L.)의 질소공급형태에 따른 저장질소의 함량과 재생기간 중 저장질소의 이용 및 재생활력을 구명하고자 수경재배 하였다. (NH$_4$)$_2$SO$_4$, KNO$_3$, Urea, Organic-N 및 NH$_4$NO$_3$의 서로 다른 질소형태로 각각 1mM/week을 4주간 공급하여 건물생산량을 보았고, 예취 후 각각의 질소 형태로 4mM/40days동안 공급하여 흡수된 질소의 함량 및 잔여기관내 축적된 질소의 함량을 관찰하였으며, 예취 후 저장된 질소에 의한 재생활력을 보기 위해 0.2mM NH$_4$NO$_3$의 형태로 동일하게 공급하였다.(중략)

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