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Tominaga, Aki; Shobu, Takahisa; Kamei, Naomitsu; Muramatsu, Toshiharu
no journal, ,
A joint exists in mechanical structure. The material used according to the use environment is also various for mechanical structure. The reliability is requested of the technology to which those are joined. Laser machining doesn't choose the material. It's expected that this is used as variety material junction technique and necessary welding technique. It's necessary to consider influence of a stress by the variety organization of the joint neighborhood, the mechanical property and the difference in the heat expansion coefficient between the variety metal together. To aim at generalization by this TAKUMI's technological calculation scientific simulation, permanent deformation spacial distribution inside the same kind material weld material between the carbon steel, the carbon steel and the variety material weld material of oxygen-free copper by a high powered fiber laser was measured and the special quality about the processing influence was estimated.
Shimoyama, Iwao; Baba, Yuji*
no journal, ,
Cs-free mineralization enable soil decontamination at lower temperature than conventional heat treatments because Cs is removed through conversion of clay minerals to different minerals, but the efficiency depends on additives. CaCl
derives high decontamination ratio accompanying phase transformation of clay minerals at 700
C, however, the effect of Cl is unclear. In this work, Cs-sorbed weathered biotite (Cs-WB) was used as a model soil, and the interaction between Cl and Cs-WB before phase transformation was investigated using NEXAFS spectroscopy. Cs-WB was reacted with NaCl-CaCl and excessive salt was removed by water rinsing. NEXAFS spectrum of the sample prepared at 400C showed three kind of Cl sites which are attributed to -1, +1, and high valencies based on the DV-X
molecular orbital calculations. Because +1 and high valence Cl sites with Cl-O bonding destabilize silica framework, this interaction can facilitate decomposition of clay minerals at moderate temperatures. The comparison of other chloride reagents suggests that the effect of Cl depends on the valence of counter cation in the reagent.
Baba, Yuji*; Shimoyama, Iwao
no journal, ,
no abstracts in English
solid by depth analysis with photo-electron spectroscopySekiguchi, Tetsuhiro; Yokoyama, Keiichi; Yano, Masahiro; Asaoka, Hidehito; Suzuki, Shinichi*; Yaita, Tsuyoshi
no journal, ,
In the recovery process for the laser isotope separation of cesium Cs-135, we need occlusion material that takes the photo-generated atomic Cs selectively, but does not take CsI molecules. In the present study, fullerene C
was selected as an occlusion material. Concentration depth distribution of Cs in the solid was evaluated using X-ray photo-electron spectroscopy (XPS). The dependence of the X-ray excitation energy for Cs
or CsI dosed C samples were measured. Difference in excitation energy dependence were observed between Cs and CsI. In Cs, the results were explained by the distribution that penetrated deeply into the solid. On the other hand, it was concluded that CsI did not penetrate into the solid.
K
Li
)NbO
- Ca(ZrTi)OYoneda, Yasuhiro; Takuwa, Chihaya*; Kobune, Masafumi*
no journal, ,
A two-body correlation distribution function obtained from high-energy X-ray diffraction experiments was applied to a niobium-based oxide ferroelectric (NaKLi)NbO - Ca(ZrTi)O with excellent piezoelectric properties. The average structure of (NaKLi)NbO - Ca(ZrTi)O changes with a small amount of Ta-additives. When the density and grain size of the sample were matched to determine whether the local structure changed with the change in the average structure, there was almost no difference in the local structure between 3
and 10. The difference was observed in the coherence of the nanoscale region, suggesting a difference in the ferroelectric domain size.
Tamura, Kazuhisa
no journal, ,
Solid/liquid interfaces are the frontier of the various chemical reactions. The reactivity of the chemical reactions greatly depends on the structure of the interface. The Electrochemical reaction is one of the reactions, which occurs at the solid/liquid interface. In the last decades, the relationship between the reactivity and the structure of the solid/liquid interface has been intensively studied and it was found that the structure of the electrode surface and electrical double layer play an important roll in electrochemical reactions. Therefore, to understand the detail of the electrochemical reactions it is fundamentally important to understand the structure of the electrolyte/electrode interface. In this study, the surface structure of Au(111) single crystal electrode under the application of a potential in 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide were investigated.