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Journal Articles

Study on flow-induced-vibration evaluation of the large-diameter pipings in a sodium-cooled fast reactor, 3; Random vibration analysis method based on turbulence energy calculated by CFD

Hirota, Kazuo*; Ishitani, Yoshihide*; Nishida, Keigo*; Sago, Hiromi*; Xu, Y.*; Yamano, Hidemasa; Nakanishi, Shigeyuki; Kotake, Shoji

Proceedings of 6th Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-6) (USB Flash Drive), 8 Pages, 2008/11

CFD simulation using the Reynolds stress model was performed to evaluate turbulence-induced forces on the piping. The turbulence energy with the CFD simulation was compared with pressure fluctuation distributions obtained by the test with a 1/3 scale elbow simulating the JSFR hot-leg piping. The profile of turbulence energy was good agreement with that of the pressure fluctuation. The magnitude of pressure fluctuation can also be estimated from calculated turbulence energy multiplied by a certain coefficient. In the vibration analysis, the power spectrum density (PSD) of the pressure fluctuation was derived from the measured normalized PSD multiplied by the coefficient. The vibration analysis method was proposed based on the PSDs derived by the above procedure and correlation lengths. The analysis results of vibration response showed good agreement with the flow-induced-vibration test results, thereby it can be said that the vibration analysis method developed in this study is valid.

Journal Articles

Phylogenetic and disruption analyses of aspartate kinase of ${it Deinococcus radiodurans}$

Nishida, Hiromi*; Narumi, Issei

Bioscience Biotechnology and Biochemistry, 71(4), p.1015 - 1020, 2007/04

https://doi.org/10.1271/bbb.60671
 Times Cited Count：2 Percentile：10.84(Biochemistry & Molecular Biology)

The radioresistant bacterium ${it Deinococcus radiodurans}$ is evolutionarily closely related to the themophilic bacterium ${it Thermus thermophilus}$. These bacteria have a single gene encoding an aspartate kinase (AK). ${it T. thermophilus}$ has an aminoadipate pathway for lysine biosynthesis, which does not use AK. Phylogenetic analysis showed that ${it D. radiodurans}$ AK had different protein structure and different evolutionary history from ${it T. thermophilus}$ AK. Disruption analysis of ${it D. radiodurans}$ AK indicated that ${it D. radiodurans}$ AK was not used for lysine biosynthesis but for threonine and methionine biosyntheses. Thus these two AKs have different evolutionary origins, but their functions are not different.

JAEA Reports

Basic research on proton acceleration based on lasers and plasmas, JAERI's nuclear research promotion program, H10-008 (Contract research)

Ogata, Atsushi*; Okamoto, Hiromi*; Kusano, Kanya*; Endo, Ichita*; Nishida, Yasushi*; Sakae, Takeji*; Arai, Masatoshi*; Nakanishi, Hiroshi*; Kondo, Kiminori*

JAERI-Tech 2002-007, 28 Pages, 2002/03

JAERI-Tech-2002-007.pdf:1.34MB

no abstracts in English

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