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Ishiyama, Shintaro; Idehara, Toshitaka*; Noda, Kazufusa*
no journal, ,
Transmission experiment of high powered THz micro beam for minimally invasive cancer therapy with micro quartz fiber was conducted with 100 W gyrotron equipment. Transmission components was consisted of two types of micro quartz fiber (0.6 mm
150 mm) and hollow waveguide horm with Au metal coating. From these results, it is concluded that 20 
90 
W output was detected from the end of antenna type micro fiver at 80 100 W input, whereas not detected in case of columnar type macro fiber.
Katsuyama, Jinya; Takeuchi, Tomoaki; Kakubo, Yuta*; Nozawa, Yasuko*; Yamaguchi, Yoshihito; Toyama, Takeshi*; Nishiyama, Yutaka; Nagai, Yasuyoshi*
no journal, ,
Cladding of stainless steel, which is composed of two phases of 
and 
phases, is overlay-welded on the inner surface of RPVs as a means for corrosion protection. For cladding, it is known that hardening occurs due to the thermal ageing. Complex distribution of phase and its hardening has possibility to raise stress locally. Therefore, we performed nanostructure analysis for thermal aged cladding material, and stress-strain analysis based on the FEM. After thermal ageing at 400 
C, it is shown that hardening of phase is due to Cr spinodal decomposition. Tensile stress corresponding to the weld residual stress is applied to FEM model which has a complex distribution of the phase based on microscopic observation. Plastic strain are produced at some regions of phase. Hardening of phase results in large tensile stress beyond 350MPa of residual stress within phase near the and phases boundaries.
Teshigawara, Makoto; Oi, Motoki; Harada, Masahide; Kasugai, Yoshimi; Takada, Hiroshi
no journal, ,
The Japan Spallation Neutron Source (JSNS) is a 1 MW pulsed neutron source of the Japan Proton Accelerator Research Complex (J-PARC). A thermal-neutron-absorber material (Au-In-Cd alloy), called decoupler, is developed to obtain a neutron beam pulse with narrow width and fast decay (short tail). In order to utilize the Au-In-Cd decoupler, we need to make the bonding between Au-In-Cd and aluminum alloy (A5083), which is structural material of moderator with curved shape in terms of the heat removal (5 W/cm
at maximum) and thermal stress. A Hot Isostatic Pressing (HIP) technique is adopted to obtain the bonding the Au-In-Cd alloy to the A5083. We found that the diffusion bonding was confirmed between the Au-In-Cd and A5083 alloy under the condition of the temperature of 490C to 550C (five cases), pressure of 100 MPa and holding time of 1 hour. In case of 535C, the intermetallic compound grown in the second diffusion layer from A5083 was confirmed, however, the strength for 535C gave three times higher than that of design requirement (30MPa).
Al rolled foil catalysts for steam reforming of methaneXu, Y.*; Ma, Y.*; Demura, Masahiko*; Hirano, Toshiyuki*; Teraoka, Yuden; Yoshigoe, Akitaka
no journal, ,
no abstracts in English
Yamaguchi, Masatake; Tsuru, Tomohito; Itakura, Mitsuhiro; Kaburaki, Hideo
no journal, ,
no abstracts in English
a
screw dislocation in MgItakura, Mitsuhiro; Yamaguchi, Masatake; Kaburaki, Hideo; Tsuru, Tomohito
no journal, ,
The Peierls stress of the prismatic slip in Mg single crystal is order of magnitude higher than that of the basal slip, resulting in highly anisotropic plasticity and low workability. To design Mg-based alloy with an improved workability, it is crucial to identify and model the correct prismatic slip behavior based on the first-principles method. In the present work, the migration pathway between split screw dislocations which are spread on two adjacent basal planes is identified using first-principles method and drag method. The line tension energy of a kink configuration is also calculated based on the lattice Green function method in first-principles calculations.
H
by direct observation of metal-hydrogen bondingMatsumura, Daiju; Nishihata, Yasuo; Matsuo, Motoaki*; Takagi, Shigeyuki*; Orimo, Shinichi*
no journal, ,
no abstracts in English
Kondo, Keietsu; Ugachi, Hirokazu; Nakano, Junichi; Kaji, Yoshiyuki; Tsukada, Takashi
no journal, ,
no abstracts in English
Oi, Motoki; Teshigawara, Makoto; Harada, Masahide; Kasugai, Yoshimi
no journal, ,
The Japan Spallation Neutron Source (JSNS) is a 1 MW pulsed neutron source of the Japan Proton Accelerator Research Complex (J-PARC). In order to produce the neutron beams with narrow width and fast decay, thermal neutron absorber (decoupler) is adopted to the moderator. For the first moderator, we developed a Ag-In-Cd decoupler. However, Ag-In-Cd decoupler also has a disadvantage of residual radioactivity, such as 108 mAg. The authors have focused on the development of a low activated decoupler for the second moderator. A combination of gold(Au), indium(In) and cadmium(Cd) was selected as the decoupler material. From the viewpoint of neutronics, we found that the Au-In-Cd decoupler provided three orders of magnitude lower radioactivity than the Ag-In-Cd one without sacrificing the neutronic performance. However, there were almost no data about Au-In-Cd alloy production. Purpose of this study is development of the Au-In-Cd alloy.
Takeyama, Akinori; Sugimoto, Masaki; Yoshikawa, Masahito
no journal, ,
There is growing interest in H production using inorganic membrane stable in reactant gases such as carbon monoxide (CO) or steam. In this study, we prepared an inorganic membrane from polymer-derived silicon carbide (SiC) using electron beam curing of polymer precursor film. Alpha almina tube, which is chemically stable but has sized pore (averaged diameter size 100 nm), was used as the support. First, supports were dipped in the 10 mass% polycarbosilne (PCS), polymer precursor solution for 1 s and drawn up (the first dipping). After drying, some of those supports coated with PCS film were immersed into another PCS solution whose concentration was 3 mass% for 0.8, 1.5 and 2 s (the second dipping). They were cured by electron beam irradiation in helium atmosphere and pylolyzed at 973 K in argon atmosphere. H permeance of SiC membrane prepared via only the first dipping increased with increasing the temperature, but not following the Arrhenius plot. This means sub-nano meter sized pores and a few of large defects coexisted in the membrane. Whereas, H permeance of the membrane prepared via the first and 1.5s of second dipping increased following the Arrhenius plot. Activation energy of 7.5 kJ/mol calculated from slope of the plot indicates that pores of the support were plugged by SiC film and thermally activated H molecules diffused through the membrane by molecular sieving mechanism.
Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
no journal, ,
no abstracts in English
Yamaguchi, Masatake; Itakura, Mitsuhiro; Shiga, Motoyuki; Kaburaki, Hideo
no journal, ,
no abstracts in English
Sugimoto, Masaki; Yoshikawa, Masahito; Seki, Shuhei*; Tsukuda, Satoshi*; Tanaka, Shunichiro*
no journal, ,
no abstracts in English
Cu alloy under high pressure and temperatureSaito, Hiroyuki; Endo, Naruki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi
no journal, ,
no abstracts in English
Shi, S.*; Ono, Naoko*; Ukai, Shigeharu*; Hayashi, Shigenari*; Abe, Yosuke
no journal, ,
For the synthesis of a bubble dispersion strengthened copper by using the pyrolysis gaseous products of Poly (PMMA) during spark plasma sintering (SPS) process, a systematic investigation of the optimal conditions was performed. It was found that the optimal conditions are 5vol
PMMA for composition and maintaining temperature of 750C for 2 hours in SPS progress.