• Title/Summary/Keyword: K490

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Molecular Dynamics Study on the Structural Phase Transition of Crystalline Silver Iodide

  • Jun Sik Lee;Mee Kyung Song;Mu Shik Jhon
    • Bulletin of the Korean Chemical Society
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    • v.12 no.5
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    • pp.490-494
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    • 1991

  • The ${\beta} to {\alpha}$ phase transition in silver iodide is studied with the (N, V, E) and (N, P, T) molecular dynamics (MD) method. In experiments, the phase transition temperature is 420 K. Upon heating of ${\beta}$ form, the iodine ions undergo hcp to bcc transformation and silver ions become mobile. MD simulations for the ${\beta}$ and ${\alpha}$ phases are carried out at several temperatures and the radial distribution functions (rdf) are obtained at those temperatures in the (N, V, E) ensemble. But the phase transition is not found in our calculation. Next the phase transition is studied with the (N, P, T) MD and we find some evidences of phase transition. At 3 Kbars and 2 Kbars the phase transition temperatu re is about 300 K. For 3.55 Kbars, the phase transition is higher (420 K) than the low pressure case. The phase transition temperature is somewhat dependent on the pressure in our calculations.

  • https://doi.org/10.5012/bkcs.1991.12.5.490 인용 PDF

Analytical Study of the Fire Resistance for Beams Consisting of Fire Resistant Steels with a Both Fixed Boundary Conditions (양단 고정단인 건축용 내화강재 적용 보부재의 해석적 내화성능 연구)

  • Kwon, In-Kyu
    • Fire Science and Engineering
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    • v.30 no.5
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    • pp.82-86
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    • 2016

  • The fire resistance of a statistically indeterminate beam made of fire resistant steel was analyzed using the mechanical and thermal databases and compared with that of an indeterminate beam constructed of ordinary structural steel to not only determine the fire resistance performance of a statistically indeterminate beam itself, but also to determine if it is stable to test the fire resistance performance with a determinate beam built with ordinary structural steel instead of an indeterminate beam made from fire resistant steels. The results showed that the fire resistance of an indeterminate beam consisting of fire resistant steels is better than that of a determinate beam made of SS 400 and if the length of the beam built with FR 490 is longer, the displacement of the beam is higher. In addition, the fire test with a determinate beam made of SS 400 is was more conservative than that of an indeterminate beam made of FR 490 in the range of the same length. Therefore, another measure should be considered if beams built with FR 490 are longer than thos of SS 400.

  • https://doi.org/10.7731/KIFSE.2016.30.5.082 인용 PDF KSCI

CONSENSUS N-TREES AND REMOVAL INDEPENDENCE

  • Powers, R.C.
    • Journal of the Korean Mathematical Society
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    • v.37 no.3
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    • pp.473-490
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    • 2000

  • Removal independence is a translation of Arrow's axiom of independence of irrelevant alternatives for social welfare functions to an axiom about consensus functions involving n-trees. It is shown that a consensus function is removal independent if and only if it is expressible as th union of three types of functions.

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