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11.
Koiso T Yamamoto K Hata Y Takahashi Y Kita E Ohshima K Okamura FP 《J Phys Condens Matter》1996,8(38):7059-7065
A structural study of [Formula: see text], grown from aqueous solution, was performed using anomalous x-ray scattering near the Cs K absorption edge to determine an absolute configuration of constituent atoms. The sense of the helical structure of the [Formula: see text] chain was found to be predominantly right-handed through a comparison of observed Bragg Bijvoet ratios with calculated ones. Assuming that [Formula: see text] consists of the two domains (i.e. right- and left-handed helices), we estimate that the volume fraction for the right-handed helix is [Formula: see text]. 相似文献
12.
Nonlinear processes in UV optical materials were investigated by using 280-fs, 248-nm pulses. Nonlinear absorption in CaF2 was confirmed to be a two-photon process by using the luminescence of self-trapped excitons, which was also used for the single shot pulse width measurement. The absorption bands due to F centers were identified in CaF2, MgF2, and LiF after several hundred shots at 100 GW/cm2. Absorption at 248 nm was considerable especially in MgF2 and LiF. Self-focusing and self-phase modulation were observed in CaF2. 相似文献
13.
T. Mochiku Y. Hata T. Wuernisha Y. Matsushita Y. Katsuya S. Ishimaru M. Tanaka K. Kobayashi A. Hoshikawa T. Ishigaki H. Yasuoka K. Hirata 《Physica C: Superconductivity and its Applications》2009,469(15-20):960-964
Heavily Fe-substituted Ba2YCu3O6+δ-type compound FeSr2YCu2O6+δ exhibits superconductivity around 60 K, only when it is annealed in N2 and subsequently in O2. Cationic distribution in this compound is strongly dependent on ionic radius at the Y site, and its superconducting properties are affected by the cationic distribution. In contrast, although the compound with the substitution of fluorite-type unit for Y has cationic order, it does not exhibit superconductivity. We have analyzed the crystal structure of the compounds with the substitution of other lanthanoid elements for Y and with substitution of fluorite-type unit for Y. 相似文献
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15.
Seiichiro Onari Tetsuya Hata Yukio Tanaka Jun-ichiro Inoue 《Journal of Physics and Chemistry of Solids》2008,69(12):3307-3309
In order to clarify the tunneling spectroscopy in high-Tc cuprates, we study electronic state of the surface in the strongly correlated electron systems. First, we obtain Green's function of strongly correlated normal bulk system using the fluctuation exchange (FLEX) approximation. Next, we insert infinite potential into the bulk system and obtain Green's function of surface. We find that the density of states (DOS) in strongly correlated bulk systems are different from that on the surface, and the difference decreases as the magnitude of Coulomb interaction (U) increases. 相似文献
16.
An axial non-mechanical scan in the laser Doppler velocimeter (LDV) using a single diffraction grating is demonstrated. The measurement position in this LDV is axially scanned using a wavelength change and a dispersion function of the grating. The experimental result using a sensor probe setup indicates that a scanning function is successfully obtained with a simpler arrangement than that of the LDV previously reported, and the ratio of the scanning range to the working distance can be enhanced by virtue of using larger angular dispersion. 相似文献
17.
Kenji Kajiyama Susumu Hata Seizou Sakata 《Applied Physics A: Materials Science & Processing》1977,12(2):209-210
Dynamic characteristics of semiconductor lasers are calculated with single-mode rate equations, taking into account spontaneous
emission factor β and bias current 相似文献
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New pyrrolylalkanethiolate-stabilized gold and palladium nanoparticles have been prepared: electrochemical polymerization of their metal nanoparticles and their TEMPO-derivatized metal nanoparticles gave the remarkably stable poly(pyrrole metal nanoparticle) films on metal electrodes. 相似文献