• Title/Summary/Keyword: 배위

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An Experimental Study on the Formation of Reversed Field Configuration (역전적세배위의 형성에 관한 실채연)

  • 김동필;이기호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.35 no.12
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    • pp.579-585
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    • 1986
  • A Reversed Field Pinch(RFP) Plasma automatically forms the reversed field configuration in a stable state by the self-reversal phenomenon. But this process of formation of the reversed field configuration has a problem that instabilities occur. In order to form a RFP configuration in a stable state by removing instabilities, this experimental study attempts to restrain Toroidal magnetic fields and supplement Toroidal flux by employing high frequency rotating fields. As a result, the reversed magnetic field configuration is stably formed in a short period because high frequency rotating fields can deflect poloidal currents and produce magnetic fields in the Toroidal direction.

A Study of Reverse Field Coordination by Toroidal Field (톨로이달 자계에 의한 역전자계 배위 연구)

  • Kim, Won-Sop
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.288-288
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    • 2010
  • In this study radio rotatiing field is used in order to form the stable reversed field configuration. The experimental study removing the flux conserving ring not so as to conserve toroidal flux, it was found that there occurred a rapid formation of a stable reversed field configuration, in which toroidal flux was increased shaping reversed field configuration and F-$\Theta$ locus traced close to BFM because it started below F value.

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Synthesis and Spectroscopic Studies of Metal Complexes Formed in the Reaction of Metal Ions with Urea at High Temperature (높은 온도에서 Urea와 금속이온과의 반응으로 얻어진 금속 Complexes의 합성과 분광학적 연구)

  • Gaballa, Akmal S.;Teleb, Said M.;Nour, El-Metwally
    • Journal of the Korean Chemical Society
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    • v.51 no.4
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    • pp.339-345
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    • 2007
  • Urea reacts with PtCl2, H2[PtCl6]·6H2O, H2[IrCl6] and Ni(CH3CO2)2 in aqueous solution at high temperature (60-80 °C) yielding [PtCl2(Urea)]·2H2O (1), (NH4)2[PtCl6] (2), (NH4)2[IrCl6]·H2O (3) and [Ni2(OH)2(NCO)2(H2O)2] (4) complexes, respectively. In complex 1, urea coordinates to Pt(II) as a neutral bidentate ligand via amido nitrogen atoms. In complexes 2, 3 and 4 it seems that the coordinated urea molecules decompose during the reaction at high temperature and a variety of reaction products are obtained. All complexes were isolated in moderate yields as dark green (1), yellow (2), pale brown (3) and faint green (4) precipitates, respectively. The reaction products were characterized by their microanalysis, IR, 1H and 13C NMR spectra as well as thermal analysis. General mechanisms describing the formation of these complexes were suggested.

Abnormality of P2O5-Na2O-MgO Glasses by Raman and Infrared Spectroscopy (라만과 적외선 분광기를 이용한 P2O5-Na2O-MgO 유리의 이상성에 관한 연구)

  • Lee, Byung-Chul;Kwon, Young-Jun;Ryu, Bong-Ki
    • Journal of the Korean Ceramic Society
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    • v.39 no.3
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    • pp.265-271
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    • 2002
  • Density, water resistance, Raman and infrared spectroscopy were used to investigate the change of structural characteristics with the composition of phosphate galss samples made by melting method. The structural abnormality of the density and water resistance were rapidly increased and shown near the 60mol% of $P_2O_5$. This result could be explained by the structural changes owing to the strong shrinkage of glass network by the coordination of DBO(Double-Bonded Oxygen) around $Mg^{2+}$ cations. In addition, it seems that the DBOs coordinating $Mg^{2+}$ cations lose its characteristics of double bonding and resonate with other NBOs(Non-Bonding Oxygen).

Single crystal growth and structure analysis of superionic conductor ${\beta}-Ag_3SI$ (초이온도전체 ${\beta}-Ag_3SI$의 단결정 육성과 결정구조 해석)

  • Nam Woong Cho;Kwang Soo Yoo;Hyung Jin Jung
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.4 no.1
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    • pp.63-70
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    • 1994
  • Single crystals of the superionic conductor ${\beta}-Ag_3SI$ were prepared by thermal treatmentr from the reactant mixture of AgI and $Ag_2S$. The growing single crystals were made to spherical shape of $200{mu}m$ in diameter. The detailed structures analyses revealed that $Ag^+$ in ${\beta}-Ag_3SI$ distribute on 12h site of 4-coordination inpreference to 3c site of 6-coordination. The effective one-particle potential (o.p.p.). of $Ag^+$ along [110] direction was evaluated from the probability density function(p.d.f.) Activation energy calculated from the o.p.p. curve has been found to be 0.012 eV for the diffusion of $Ag^+$ on (001) plane in the ${\beta}-Ag_3SI$ structure.

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