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Ohtomo, M.,Yamauchi, Y.,Sun, X.,Kuzubov, A.,Mikhaleva, N.,Avramov, P.,Entani, S.,Matsumoto, Y.,Naramoto, H.,Sakai, S. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.6
<P>We report the structural analysis and spin-dependent band structure of hydrogenated boron nitride adsorbed on Ni(111). The atomic displacement studied by using the normal incidence X-ray standing wave (NIXSW) technique supports the H-B(fcc):N(top) model, in which hydrogen atoms are site-selectively chemisorbed on boron atoms and N atoms remain on top of Ni atoms. The distance between the Ni plane and nitrogen plane did not change after hydrogenation, which implies that the interaction between Ni and N is 3d-pi orbital mixing (donation and back-donation) even after hydrogenation of boron. The remaining pi* peaks in near-edge X-ray absorption fine structure (NEXAFS) spectra are a manifestation of the rehybridization of sp(2) into sp(3) states, which is consistent with the N-B-N bonding angle derived from NIXSW measurement. The SPMDS measurement revealed the spin asymmetry appearing on hydrogenated h-BN, which was originated from a p related orbital with back donation from the Ni 3d state. Even though the atomic displacement is reproduced by the density functional theory (DFT) calculation with the H-B(fcc):N(top) model, the experimental spin-dependent band structure was not reproduced by DFT possibly due to the self-interaction error (SIE). These results reinforce the site-selective hydrogenation of boron and pave the way for efficient design of BN nanomaterials for hydrogen storage.</P>
A. Ohtomo,Z. Iwai,H. Fukuda,I. Mizumoto,H. Dozono 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
The simple adaptive control(SAC) method has attracted attention for interest of the simple structure of its adaptive controller. We establish that the introduction of output derivative action to the original SAC system definitely improves the response characteristic of the control system. The effect of such an introduction is confirmed through experimental results by applying the method to a servo control system using a direct drive (DO) motor.
Slenderness ratio of telescopic cylinder-columns
Sugiyama, Yoshihiko,Ohtomo, Takamitsu Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.3
The present paper deals with the effective slenderness ratio of telescopic cylinders as a long column having different cross sections. Firstly, the slenderness ratio defined in the current standard for the telescopic cylinders is discussed to point out some difficulties which arise when the ratio is applied to the column having different cross sections. Secondly, a new effective slenderness ratio is proposed for columns having different cross sections by introducing a partial effective slenderness ratio. Finally, the proposed slenderness ratio is applied, for extending and development of discussion, to a two-staged column having piece-wise constant cross sections and a cylindrical column having linearly varying diameters.