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- 저자 : H. Isshiki (검색결과 5 건)
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An Axisymmetrical Dock in Waves
Isshiki, H.,Hwang, J.H. 대한조선학회 1976 大韓造船學會誌 Vol.13 No.2
Linearized motions of as axisymmetrical dock freely floating in a regular plane wave are discussed. An extension of the Bessho variational principle(Bessho[3]) is derived to obtain a numerical procedure for a solution of the boundary value problem associated with the fluid motion. The added mass and the damping coefficients for a circular dock in vertical(heave) and horizontal(surge) oscillations are evaluated numerically, and the resulte seems to be satisfactory.
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Visible luminescence of nanocrystalline AlN:Er thin film by co-deposition of AlN, Er, and SiO2
J.-W. Lim,W. Takayama,Y.F. Zhu,J.W. Bae,J.F. Wang,S.Y. Ji,K. Mimura,J.H. Yoo,M. Isshiki 한국물리학회 2007 Current Applied Physics Vol.7 No.3
We report a visible luminescence of Er3+ ions in an amorphous-nanocrystalline AlN:Er thin lm prepared by co-deposition usingAlN, Er, and SiO2 3+ in the AlN:Er lm annealed at 750.C showed a strong bluish green emissionof Er3+ in the amorphous-nanocrystalline AlN:Er thin lm, which is attributed to the intra-4fEr3+ transitions of2H11/2!4I15/2 and4F7/2!4I15/2The occurrence of the strong Er3+ emission in the annealed AlN:Er thin lm with a mixture of amorphous and nanocrystalline phasesmay be contributed to an increase in the number of excitation Er3+ centers and a presence of oxygen related to Er3+ excitation andrecombination process in the AlN:Er thin film.
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