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Shiraishi, Fumito*; Chihara, Ryoji*; Tanimoto, Risa*; Tanaka, Kazuya; Takahashi, Yoshio*
Island Arc, 31(1), p.e12448_1 - e12448_9, 2022/05
Times Cited Count：0 Percentile：0(Geosciences, Multidisciplinary)At Yunotaki Fall in north Japan, manganese-oxidizing bacteria were previously assumed to have oxidized manganese to precipitate birnessite, which relied on oxygen released from algae. However, it remained unclear whether larger-scale manganese oxide precipitation was actually occurring under light conditions. This study evaluated the contribution of indirect oxidation using microelectrodes to analyze local water chemistry, in addition to bulk water chemistry and DNA analyses. The results of this study demonstrate that low bulk pH values in the hot spring water hindered indirect oxidation despite the occurrence of active oxygenic photosynthesis and that direct oxidation by manganese-oxidizing bacteria is considered to dominate in the investigated sample.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
Tanimoto, Ryoji*; Yoshimura, Tadahiro*; Hoshino, Yasushi*; Munekata, Hideki*; Tamaki, Yoshihisa*
JNC TJ9420 2004-003, 212 Pages, 2004/02
JNC-TJ9420-2004-003.pdf:117.29MB
Comparative evaluation of system characteristics such as system safety, economics, environmental burden reduction, etc. concerning candidate fuel fabrication systems are carrying out in the feasibility study on commercialized FBR cycle systems. In its phase II study, a study on characteristics evaluation techniques which focused attention on operating rate of the plant and waste generation started. In last fiscal year, the relationship between operating rate of the plant and waste generation amount was investigated in consideration of failure frequency and periodic replacement of equipments, and perspectives of characteristics comparison between multiple fuel fabrication systems were made clear. In this fiscal year, system characteristics evaluation of each low DF fuel fabrication system was conducted and characteristics comparison between those systems was carried out on the bases of perspectives which made clear last fiscal year. Plant design data obtained for each characteristics evaluation were linked to a database in order to make use of future system design investigation. In addition, system safety represented by operating rate and environmental burden reduction represented by waste generation were chosen as the intended characteristics in this study. In addition to this, programs of the characteristics evaluation simulator which designed until last fiscal year were modified in order to make more accurate calculation possible.
Tanimoto, Ryoji*; Yoshimura, Tadahiro*; Hoshino, Yasushi*; Munekata, Hideki*; Tamaki, Yoshihisa*
JNC TJ9420 2004-002, 143 Pages, 2004/02
JNC-TJ9420-2004-002.pdf:72.69MB
In the third year of feasibility studies on commercialized FBR cycle system phase II, design consideration of fuel fabrication equipments at lower processes than the fuel element fabrication and line composition examination, regarding low decontamination pellet fuel fabrication facilities, were conducted. Incidental facilities such as flushing and decontamination facilities of solid waste were also studied. A concept of fuel fabrication plant in 200t-HM/y scale was shown as well as system properties data acquisition concerning economics and environmental burden reduction of fuel fabrication plant.
Tanimoto, Ryoji*; Kikuchi, Toshiaki*; Tanaka, Hirokazu*; Amino, Masaki*; Yanai, Minoru*
JNC TJ9420 2004-001, 258 Pages, 2004/02
JNC-TJ9420-2004-001.pdf:10.19MB
Process and layout design of external wet gelation stages in vibropacking process was examined for the feasibility study of commercialized FBR cycle system. In tbhis study, following process stages for the oxide core fuel production line were covered, that is, solidification, washing, drying, calcination, reduction, sintering stages including interim storage of sintering particles and reagent recovery stage.
Tanimoto, Ryoji*; Yoshimura, Tadahiro*; Hoshino, Yasushi*; Munekata, Hideki*; Tamaki, Yoshihisa*
JNC TJ9400 2004-002, 58 Pages, 2004/02
JNC-TJ9400-2004-002.pdf:1.39MB
In this investigation, ceramics denitration containers with ball valve units were manufactured and preliminary tests of microwave denitration, calcination and reduction were carried out in last fiscal year. In this fiscal year, a small scale denitration /conversion apparatus with turntable system was designed and manufactured, then a series of microwave denitration/conversion tests was conducted. Feasibility of the denitration/conversion apparatus with turntable system was evaluated by checking powder properties and soundness of apparatus through the series of tests. The summary of the results are as follows;(1).By the series of microwave denitration, calcination, and reduction tests using small scale denitration/conversion apparatus with turntable system manufactured, it is confirmed that there are no critical problem in the apparatus.(2).Checking the powder properties after grinding, it is confirmed that the powder is equivalent of one obtained by conventional microwave denitration /conversion facility.(3).Reduced powder was grinded and pressed to several pellets, then sintered. It was confirmed that high density pellet fuel can be obtained.(4).Studying the test results from the viewpoint of feasibility of denitration/conversion facility with turntable system, the R&D issues were made clear.
