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Hirota, Noriaki; Takeda, Kiyoko*; Tachibana, Yukio; Masaki, Yasuhiro*
Zairyo To Kankyo, 70(3), p.68 - 76, 2021/03
Corrosion resistance of stainless steels and Ni-based alloys were evaluated in a sulfuric acid decomposition gas at high temperature. The evaluation were carried out in an environment simulated in the sulfuric acid decomposition reaction vessel for thermochemical hydrogen production process (IS process). Their corrosion films were also analyzed for better understanding of the corrosion behavior. As a result, after 100 hour corrosion test, Ni-based alloy containing 2.4% Si showed good corrosion resistance. Ferritic stainless steel containing 3% Al (3Al-Ferrite) showed better corrosion resistance. Its corrosion rate was lower than that of SiC (0.1mm/year), which is a candidate material for the sulfuric acid decomposition reaction vessel. On the other hand, Ni-based alloy pre-filmed with AlO
is prepared as the relative corrosion film of 3Al-Ferrite. Its corrosion rate was significantly higher than that of 3Al-Ferrite. As the result of EPMA analysis of these oxide films, Ni-based alloy containing 2.4% Si formed Si oxide film which had some cracks after the long term corrosion test. Therefore S penetrated into grain boundaries of the matrix through the oxide film. 3Al-Ferrite formed a thin and uniform Al
O
film, and the penetration of S into the grain boundaries was not observed. Al
O
pre-film of Ni-based alloy also showed S penetration in the matrix because the Al
O
pre-film had many small defects originally. The corrosion oxide film of 3Al-Ferrite consisted of only
-Al
O
, while the Al
O
pre-film consist of
-Al
O
and
-Al
O
. Those results suggest that the better corrosion resistance of 3Al-Ferrite is due to the uniform formation of dense
-Al
O
film at the early stage of the corrosion.
Maruyama, Yudai*; Takeda, Kiyoko*; Tomooka, Norihiko*; Sato, Katsuya; Ono, Yutaka; Yokoyama, Tadashi*
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 99, 2016/02
Fujinami, Shun*; Takeda, Kiyoko*; Onodera, Takefumi*; Sato, Katsuya; Shimizu, Tetsu*; Wakabayashi, Yu*; Narumi, Issey*; Nakamura, Akira*; Ito, Masahiro*
Genome Announcements (Internet), 3(5), p.e01005-15_1 - e01005-15_2, 2015/09
Takeda, Kiyoko*; Sato, Katsuya; Narumi, Issey*; Ono, Yutaka; Otsu, Naoko*; Yokoyama, Tadashi*
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 120, 2015/03
Fujinami, Shun*; Takeda, Kiyoko*; Onodera, Takefumi*; Sato, Katsuya; Sano, Motohiko*; Takahashi, Yuka*; Narumi, Issey*; Ito, Masahiro*
Genome Announcements (Internet), 2(5), p.e00866-14_1 - e00866-14_2, 2014/09
Fujinami, Shun*; Takeda, Kiyoko*; Onodera, Takefumi*; Sato, Katsuya; Sano, Motohiko*; Narumi, Issey*; Ito, Masahiro*
Genome Announcements (Internet), 2(3), p.e00458-14_1 - e00458-14_2, 2014/05
Sato, Katsuya; Onodera, Takefumi*; Takeda, Kiyoko; Narumi, Issey*
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 110, 2014/03
Takeda, Kiyoko; Sato, Katsuya; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 114, 2014/03
Fujinami, Shun*; Takeda, Kiyoko; Onodera, Takefumi*; Sato, Katsuya; Sano, Motohiko*; Narumi, Issey*; Ito, Masahiro*
Genome Announcements (Internet), 1(6), P. e01043-13, 2013/12
Takeda, Kiyoko; Tejima, Kohei*; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 107, 2013/01
Tejima, Kohei*; Yokoyama, Tadashi*; Sato, Katsuya; Takeda, Kiyoko; Narumi, Issei
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 112, 2013/01
Tejima, Kohei; Sato, Katsuya; Takeda, Kiyoko; Yokoyama, Tadashi*; Narumi, Issei
Radioisotopes, 61(4), p.161 - 171, 2012/04
A biofertilizer is a substance that holds beneficial microorganisms for plant growth in a carrier material. To demonstrate the effect of -sterilization, the survival of the
was monitored to assess the shelf life of biofertilizers. As biofertilizer carriers, five kinds of typical Japanese soil-based materials were used. Following the sterilization of carrier materials by
-irradiation or autoclaving,
was inoculated into each material. The biofertilizer was stored for 12 months at 4
C or 30
C. After storage, viable inoculants in the biofertilizer were enumerated. Results indicated that inoculant density after storage was greater than the initial density in biofertilizers made from sterilized carriers, whereas it decreased significantly in biofertilizers made from non-sterilized carriers.
-sterilization was superior to autoclave sterilization in enhancing inoculant survival in some cases.
Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 110, 2012/01
Takeda, Kiyoko*; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 75, 2011/01
Yokoyama, Tadashi*; Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei
no journal, ,
no abstracts in English
Tejima, Kohei; Yokoyama, Tadashi*; Sato, Katsuya; Takeda, Kiyoko; Narumi, Issei
no journal, ,
Biofertilizer is a substance that holds beneficial microorganism for plant growth (e.g. Rhizobia) in the carrier such as peat, perlite, charcoal and soil. To use biofertilizer more efficiently, it is necessary to keep the amount of viable inoculants in the biofertilizer for a definite period of time. The inoculants survival in the biofertilizer could be affected by the physical and chemical properties of carrier materials and by the competition with native microorganisms in the carrier. -irradiation is expected to sterilize the carrier materials without changes in physical and chemical properties. In an effort to demonstrate the advantage of
-sterilization, the survivals of inoculants were monitored to assess the shelf life of biofertilizer.
Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
no journal, ,
In Asian countries, in order to increase crop yield under low input of chemical nitrogen fertilizers, many researchers are trying to develop biofertilizers. However, several researchers point out constraints on application of biofertilizers. Major constraint is a viability loss of beneficial microorganisms in biofertilizers caused by exposure to high temperature and drought stress under both storage and transportation conditions. Therefore, we are trying to improve a phenotypic character concerning high temperature tolerant in USDA110, which is a worldwide superior inoculant to soybean. In this study, ion-beam microbial mutation-breeding technology is used to generate high temperature tolerant mutants. Consequently, we obtained high temperature tolerant mutants of
USDA110, which can survive at 45
C for 5 days. Now, we are characterizing these mutants in terms of differences in several phenotypic properties.
Tejima, Kohei; Sato, Katsuya; Takeda, Kiyoko; Narumi, Issei; Yokoyama, Tadashi*
no journal, ,
no abstracts in English
Takeda, Kiyoko; Sato, Katsuya; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*
no journal, ,
Yokoyama, Tadashi*; Takeda, Kiyoko*; Tejima, Kohei; Sato, Katsuya; Narumi, Issei
no journal, ,
no abstracts in English