• Title/Summary/Keyword: Crystallography

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Calculation of the Number of Intensity Data (강도자료의 수 계산)

  • 서일환;이진현
    • Korean Journal of Crystallography
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    • v.4 no.1
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    • pp.49-51
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    • 1993

  • The knowledge on the number of necessary and collectable reflections for the crystal structure analysis is greatly helpful in choosing the conditions for X-ray intensity data collection using automatic four circle diffractometer. In this paper, we represent a method to calculate the total unmber of collectable intensity date in an asymmetric unit.

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Impact Characteristics of Garphite/Epoxy Composite Materials with Non-wowen Tissue (부직포를 삽입한 Graphite/Epoxy 복합재료의 충격 특성)

  • 정성균;서유원;이승환
    • Korean Journal of Crystallography
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    • v.9 no.2
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    • pp.125-130
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    • 1998

  • 본 논문에서는 부직포를 삽입한 Gr/Ep 복합재료의 충격 흡수 특성을 연구하였다. 계면(interface) 층에 유리 부직포 또는 탄소 부직포를 삽입하여 복합적층판을 제작하였다. 저속충격 시험을 수행하였으며, 충격에 의한 층간분리(delamination)를 C-Scan과 현미경을 사용하여 관찰하였다. 실험결과 계면에 부직포를 삽입함으로써 충격에 의한 층간분리 면적이 감소함을 알 수 있었다.

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Synthesis of 6,13-Bis(thymidinyl)-5,12-dioxocyclams and the Molecular Structure of the (R,S)-Isomer

  • 박재욱;Louis S. Hegedus;Melissa Hellman
    • Bulletin of the Korean Chemical Society
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    • v.20 no.8
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    • pp.917-920
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    • 1999

  • The three stereoisomers of the 6,13-bis(thymidinyl)dioxocyclam 6 were synthesized through photoreaction of the chromium alkoxycarbene complex 2 and 1-(benzyloxycarbonyl)-4,4-dimethyl-D 2 -imidazoline. The molecular structure of (R,S)-6 was elucidated by X-ray crystallography.

  • https://doi.org/10.5012/bkcs.1999.20.8.917 인용 PDF