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Electron heating experiment using the high harmonic fast wave on LHD
hiroshi Kasahara,K. Saito,N. Takeuchi,R. Kumazawa,T. Seki,T. Mutoh,T. Oosako,Y. Takase 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Electron heating experiments using the High Harmonic Fast Wave (HHFW) were performed on the Large Helical Device (LHD). An electron temperature increase from 2.5 keV to 3.6 keV by 1.2 MW of HHFW was observed when both ECH and NBI were used to create a target plasma with high stored energy and electron temperature. When ECH works effectively, the electron density is pumped out, but the rate of decrease of the electron density is reduced when HHFW heating is applied. This result indicates that HHFW is absorbed effectively when the central electron temperature and electron beta are high enough, and suggests that parallel heating of electrons by HHFW reduces electron density pump out caused by perpendicular electron heating by ECH. According to a 1-D calculation, raising the density is more effective for improving singlepass damping than raising the temperature. According to a 2-D full-wave calculation, electron damping occurs in an off-axis region at low density, but wave fields become more concentrated in the core and absorption becomes more centrally localized at high density.e
In-situ Observation of Hydride Stability of Vanadium Alloys in Electron Microscope
Ohnuki, S.,Takase, K.,Yashiki, K.,Hamada, K.,Suda, T.,Watanabe, S. Korean Society of Electron Microscopy 2006 Applied microscopy Vol.36 No.2
High-resolution microscopy was applied for surveying hydride stability in Vanadium alloys, which are candidate for hydrogen storage materials of advanced hydrogen energy systems. $V_2H$ hydride in V alloys was stable at room temperature under the vacuum condition, but it was decomposed during heating up to $100^{\circ}C$. It was confirmed from HRTEM image and FFT that $V_2H$ has a BCT structure, where hydrogen atoms locate at octahedral sites. Crystal orientation was <110> beta// <110> mat., and lattice strain is about 10%. After the decomposition of the hydride, relatively large lattice expansion was observed in the matrix, which suggests that hydrogen atoms should be trapped by lattice defects and included in the matrix. Intensive electron beam also enhanced the decomposition.
Obi, T.,Matsumoto, M.,Miyazaki, K.,Kitsutaka, K.,Tamaki, M.,Takase, K.,Miyamoto, A.,Oka, T.,Kawamoto, Y.,Nakada, T. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.9
Comparisons of properties between skeletal ryanodine receptor 1 (sRyR1)-heterozygous-mutated and normal types of meat were carried out in pigs using PSE (pale, soft and exudative) meat found during the butchering process. All samples considered to be PSE meat showed irregular running and disorder of the muscle fibers and a wider inter-fiber space upon light microscopic observation. Electron microscopy revealed disintegration, twisting, and disorder of the myofibril arrangement and elimination of the Z line in PSE meat, compared with normal meat. Meat property tests demonstrated greater decreases in water holding capacity, moisture and sarcoplasmic protein, and higher $L^*$ values for the meat color index in PSE meat than in normal meat, but there were no differences in these factors between genetically normal and sRyR1-heterozygous PSE meat. On the other hand, higher $a^*$ and $b^*$ values were observed in sRyR1-heterozygous than in normal PSE meat, and similar alterations to the a* value were observed in terms of the amount of myoglobin and density of the 17-kDa protein band, corresponding to the molecular mass of myoglobin, on SDS-PAGE gels. These results suggest that sRyR1-heterozygous PSE pork contains much more myoglobin than genetically normal PSE meat.