Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Iyota, Muneyoshi*; Matsuda, Tomoki*; Sano, Tomokazu*; Shigeta, Masaya*; Shobu, Takahisa; Yumoto, Hirokatsu*; Koyama, Takahisa*; Yamazaki, Hiroshi*; Semba, Yasunori*; Ohashi, Haruhiko*; et al.
Journal of Manufacturing Processes, 94, p.424 - 434, 2023/05
Times Cited Count：3 Percentile：57.26(Engineering, Manufacturing)Morishita, Yuki; Kurosawa, Shunsuke*; Yamaji, Akihiro*; Hayashi, Masateru*; Sasano, Makoto*; Makita, Taisuke*; Azuma, Tetsushi*
Scientific Reports (Internet), 11(1), p.5948_1 - 5948_11, 2021/03
Times Cited Count：2 Percentile：31.78(Multidisciplinary Sciences)The internal exposure of workers who inhale plutonium dioxide particles in nuclear facilities is a crucial matter for human protection from radiation. To determine the activity median aerodynamic diameter values at the working sites of nuclear facilities in real time, we developed a high-resolution alpha imager using a ZnS(Ag) scintillator sheet, an optical microscope, and an electron-multiplying charge-coupled device camera. Then, we designed and applied a setup to measure a plutonium dioxide particle and identify the locations of the individual alpha particles in real time. Employing a Gaussian fitting, we evaluated the average spatial resolution of the multiple alpha particles was evaluated to be 16.2 umFWHM with a zoom range of 5 x. Also, the spatial resolution for the plutonium dioxide particle was 302.7 umFWHM due to the distance between the plutonium dioxide particle and the ZnS(Ag) scintillator. The influence of beta particles was negligible, and alpha particles were discernible in the alpha-beta particle contamination. The equivalent volume diameter of the plutonium dioxide particle was calculated from the measured count rate. These results indicate that the developed alpha imager is effective in the plutonium dioxide particle measurements at the working sites of nuclear facilities for internal exposure dose evaluation.
in the liquid nitrogen and natural gas temperature regionsYoshii, Kenji; Hayashi, Naoaki*; Mizumaki, Masaichiro*; Takano, Mikio*
AIP Advances (Internet), 7(4), p.045117_1 - 045117_6, 2017/04
Times Cited Count：6 Percentile：29.59(Nanoscience & Nanotechnology)We have investigated the magnetocaloric effect (MCE) of Ba
Sr
Fe
O (x
0.2), a series of cubic perovskites showing a field-induced transition from helical antiferromagnetism to ferromagnetism. The maximum magnetic entropy change (-
S
) at 50 kOe varies from 
5.8 J kg
K (x=0) to 4.9 J kgK (x=0.2), while the refrigerant capacity remains almost the same at 165 J kg. Interestingly, the temperature of -S decreases from 116 K to 77 K with increasing x, providing this series of rare-earth-free oxides with potential as a magnetic refrigerant for the liquefaction of nitrogen and natural gas.
studied by X-ray spectroscopyMizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*
Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06
Times Cited Count：10 Percentile：94.45(Physics, Condensed Matter)We investigated the electronic structure of BaFeO by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.
FeO and zero-thermal expansion compositeNabetani, Koichiro*; Muramatsu, Yuya*; Oka, Kengo*; Nakano, Kiho*; Hojo, Hajime*; Mizumaki, Masaichiro*; Agui, Akane; Higo, Yuji*; Hayashi, Naoaki*; Takano, Mikio*; et al.
Applied Physics Letters, 106(6), p.061912_1 - 061912_5, 2015/02
Times Cited Count：60 Percentile：89.12(Physics, Applied)Negative thermal expansion (NTE) of BiNi
Fe
O
is investigated by dilatometric curves, synchrotron X-ray diffraction, and X-ray absorption spectroscopy. All samples (x=0.05-0.15) shows large NTE with the coefficient of linear thermal expansion which induced by charge transfer between Bi
and Ni
in the controlled temperature range near room temperature. Compared with BiLnNiO (Ln: rare-earth elements), the thermal hysteresis that causes a problem for practical application is suppressed because random distribution of Fe in the Ni site changes the first order transition to second order-like transition.
Omichi, Masaaki*; Asano, Atsushi*; Tsukuda, Satoshi*; Takano, Katsuyoshi*; Sugimoto, Masaki; Saeki, Akinori*; Sakamaki, Daisuke*; Onoda, Akira*; Hayashi, Takashi*; Seki, Shu*
Nature Communications (Internet), 5, p.3718_1 - 3718_8, 2014/04
Times Cited Count：35 Percentile：78.11(Multidisciplinary Sciences)Protein nanowires exhibiting specific biological activities hold promise for interacting with living cells and controlling and predicting biological responses such as apoptosis, endocytosis and cell adhesion. Here we report the result of the interaction of a single high-energy charged particle with protein molecules. Degradation of the human serum albumin nanowires was examined using trypsin. The biotinylated human serum albumin nanowires bound avidin, demonstrating the high affinity of the nanowires. Human serum albumin-avidin hybrid nanowires were also fabricated from a solid state mixture and exhibited good mechanical strength. The biotinylated human serum albumin nanowires can be transformed into nanowires exhibiting a biological function such as avidin-biotinyl interactions and peroxidase activity. The present technique is a versatile platform for functionalizing the surface of any protein molecule with an extremely large surface area.
Mizumaki, Masaichiro*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Takano, Mikio*
Journal of Applied Physics, 114(7), p.073901_1 - 073901_6, 2013/08
Times Cited Count：19 Percentile：61.74(Physics, Applied)We have investigated the magnetocaloric effect (MCE) of a perovskite oxide, BaFeO, that shows ferromagnetism by the aid of a small external field of about 0.3 T below the Curie temperature T
= 111 K. The magnetization is found to change almost reversibly in both field and temperature cycles. Hence, magnetic and thermal hysteretic losses are negligibly low during refrigeration, a property that is suitable for application. The reversible MCE is likely to arise from the absence of an orbital magnetic moment of Fe ions which are essentially in the Fe
L state (L: ligand hole). The magnetic entropy change and refrigerant capacity near the T are about 5.8 J kg K and about 172 J kg, respectively, both of which are comparable to those of ferromagnetic perovskite manganites. As BaFeO contains no rare metals and is stable against corrosion, the material can be regarded as a candidate refrigerant material.
Mizuta, Yoshio*; Hosokai, Tomonao*; Masuda, Shinichi*; Zhidkov, A.*; Makito, Keigo*; Nakanii, Nobuhiko*; Kajino, Shohei*; Nishida, Akinori*; Kando, Masaki; Mori, Michiaki; et al.
Physical Review Special Topics; Accelerators and Beams, 15(12), p.121301_1 - 121301_10, 2012/12
Times Cited Count：21 Percentile：72.39(Physics, Nuclear)Liu, Q.; Homma, Toshimitsu; Nishimaki, Yuichiro*; Hayashi, Hiroko*; Terakado, Masato*; Tamura, Satoshi*
JAEA-Data/Code 2010-001, 57 Pages, 2010/03
JAEA-Data-Code-2010-001.pdf:16.81MB
For a risk assessment model of an engineering system, the uncertainties in the model inputs propagate through the model and lead to the uncertainty in the model output. In order to evaluate the model output uncertainty and the contribution of each model input to the output uncertainty, the computer code GSALab, which is based on Monte Carlo simulations, has been developed. It is composed of three parts, namely, random samples generation, uncertainty analysis and sensitivity analysis. In the part of sensitivity analysis, several global sensitivity indicators, including the popularly used variance-based indicators, are implemented. In addition, the GUI (Graphical User Interface) of GSALab has been developed for the user's convenience. In addition to risk assessment models, it is also possible to use GSALab for uncertainty and sensitivity analysis of a wide class of mathematical models.
Matsumura, Hiroyoshi*; Adachi, Motoyasu; Sugiyama, Shigeru*; Okada, Shino*; Yamakami, Megumi*; Tamada, Taro; Hidaka, Koshi*; Hayashi, Yoshio*; Kimura, Toru*; Kiso, Yoshiaki*; et al.
Acta Crystallographica Section F, 64(11), p.1003 - 1006, 2008/11
Times Cited Count：17 Percentile：77.92(Biochemical Research Methods)This paper reports the crystallization and preliminary neutron diffraction measurements of HIV-1 protease, a potential target for anti-HIV therapy, complexed with an inhibitor (KNI-272). The aim of this neutron diffraction study is to obtain structural information about the H atoms and to determine the protonation states of the residues within the active site. The crystal was grown to a size of 1.4 mm
by repeated macroseeding and a slow-cooling method using a two-liquid system. Neutron diffraction data were collected at room temperature using a BIX-4 diffractometer at the JRR-3 research reactor of the Japan Atomic Energy Agency (JAEA). The data set was integrated and scaled to 2.3 
resolution in space group P2(1)2(1)2, with unit-cell parameters a = 59.5, b = 87.4, c = 46.8 .
Hayashi, Maki*; Yoshikawa, Hideki
JAEA-Research 2008-024, 56 Pages, 2008/03
JAEA-Research-2008-024.pdf:20.71MB
Corrosion analysis have carried out on forty iron-based archaeological remains, which had been dug out at seventeen relics in Japan. Although JAEA estimated the corrosion amount of the carbon steel to be 31mm for 1000 years by the second progress Report (H12), this analysis clarified the corrosion amount of the iron-based archaeological remain was lower than 31mm. Most of iron-based archaeological remains for this analysis had been buried in a oxidizing environment. Because the disposal environment is expected to be reducing condition, the corrosion data in conditions relevant for geological disposal are desirable. The purpose of this study is to investigate the corrosion of the soil solid sample that contains the plow excavated from the Oda castle. We want to use medical X-ray CT owned in the JAEA for metal natural analogue study. Therefore, same sample were measured by high energy industry machine for industry and medical X-ray tomography. And the comparison of each X-ray CT Image and measurement of thickness of rust were performed.
Hayashi, Maki*; Sasamoto, Hiroshi; Yoshikawa, Hideki
JAEA-Data/Code 2008-008, 17 Pages, 2008/03
JAEA-Data-Code-2008-008.pdf:5.08MB
In geological disposal system, high-level radioactive waste (HLW) glass is expected to retain radionuclide for the long term as the first barrier to prevent radionuclide release. The advancement of its performance assessment technology leads to the reliability improvement of the safety assessment of entire geological disposal system. For this purpose, phenomenological studies for improvement of scientific understanding of dissolution/alteration mechanisms, and development of robust dissolution/alteration model based on the study outcomes are indispensable. The database on glass dissolution has been developed for supporting these studies. This report describes improvement of the prototype glass database. Also, this report gives an example of the application of the database for verification of glass dissolution model.
Tsuchiya, Kunihiko; Hoshino, Tsuyoshi; Kawamura, Hiroshi; Mishima, Yoshinao*; Yoshida, Naoaki*; Terai, Takayuki*; Tanaka, Satoru*; Munakata, Kenzo*; Kato, Shigeru*; Uchida, Munenori*; et al.
Nuclear Fusion, 47(9), p.1300 - 1306, 2007/09
Times Cited Count：23 Percentile：62.01(Physics, Fluids & Plasmas)no abstracts in English
Tsuchiya, Kunihiko; Hoshino, Tsuyoshi; Kawamura, Hiroshi; Mishima, Yoshinao*; Yoshida, Naoaki*; Terai, Takayuki*; Tanaka, Satoru*; Munakata, Kenzo*; Kato, Shigeru*; Uchida, Munenori*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03
no abstracts in English
CHayashi, Maki*; Satake, Kenji*; Sasamoto, Hiroshi
JAEA-Data/Code 2006-012, 25 Pages, 2006/03
JAEA-Data-Code-2006-012.pdf:2.2MB
An international interlaboratory study (ILS) was coordinated by Argonne National Laboratory (ANL) to evaluate the precision and bias of a single-pass flow-through (SPFT) test method that can be used to measure the forward dissolution rate of borosilicate glass. In this report we present the results of tests conducted at 70C using the LRM glass prepared by ANL. Based on measurements of the concentrations of glass components (i.e., Si, B and Na) in effuluent solutions and the solution flow rate, glass dissolution rates were calculated under the steady-state concentrations of glass components. The rates in the absence of glass components were estimated by extrapolation of the experimental results to zero concentration of glass components. Results show that the average pH of effuluent solutions was 11.68
0.23 (0.23 refers to standard deviation) at room temperature (21.784.03C, 4.03 means standard deviation). The estimated dissolution rate of LRM glass, based on variations in Si, B and Na concentrations in the absence of solution-feedback effects, is 2.11, 1.99 and 1.93 (g/m
d), respectively. The reliability of these estimates is questionable, however, due to considerable scatter in the aqueous concentration data. Based on these results, it is suggested that carefully controlled and constant flow rates are required to obtain reliable data using the SPFT test method.
Hayashi, Maki*; Satake, Kenji*; Yoshikawa, Hideki; Yui, Mikazu
JNC TN8400 2005-008, 30 Pages, 2005/04
JNC-TN8400-2005-008.pdf:32.41MB
The dissolution rate of radionuclide from radioactive waste (HLW) glass is one of the important parameters for the safety assessment of the geological disposal system. A lot of information on the dissolution behavior of the glass are open to the public and have useful information to understand the essential characteristic of the glass under various conditions. We collected information on the dissolution behavior of the glass (Glass, Experimental Type, Solution, Experimental Conditions, Experimental Results, Reference) from Scientific Basis for Nuclear Waste management published by Materials Research Society (MRS). This system contains 846 data now. This database is supported by Windows Me / Access2002 to search of data, reference document, and graphs.
TiO pebble bed under neutron pulse operationTsuchiya, Kunihiko; Kikukawa, Akihiro*; Hoshino, Tsuyoshi; Nakamichi, Masaru; Yamada, Hirokazu*; Yamaki, Daiju; Enoeda, Mikio; Ishitsuka, Etsuo; Kawamura, Hiroshi; Ito, Haruhiko; et al.
Journal of Nuclear Materials, 329-333(Part2), p.1248 - 1251, 2004/08
Times Cited Count：10 Percentile：55.72(Materials Science, Multidisciplinary)no abstracts in English
Hayashi, Maki*; Ueno, Kenichi; Yoshikawa, Hideki; Yui, Mikazu
JNC TN8400 2003-029, 33 Pages, 2003/11
JNC-TN8400-2003-029.pdf:3.55MB
The purpose of this study is to understand, experimentaly and analytically, the alteration-phase formation and associated elemetal release during aqueous corrosion of HLW glass in order to establish the evaluation and modeling of a more realistic long-term exudation action in disposal environment. Static deterioration tests were performed with a simulated HLW glass, P0798 glass, in solution pH is fixed on conditions (pH=11) and Na concentration is changed, the dissolution of glass and mineralization and the influence of Na concentration exerted on Cs exudation were evaluated. The solution concentrations of dissolved elements were measured by use of ICP-AAS , ICP-AES , ICP-MS , and the unreacted glass and reacted glass were analyzed by use of XRD and BET , electron microscope (SEM/EDS). The results indicated that; 1)Na-beidellite may generate in this experiment condition, 2)The glass dissolution proceeds in proportion to square root of time , it turns out that it is not dependent on Na concentration in solution on this experiment conditions, 3)Most of Cs in the glass is involved with the crystalline alteration-phases formation on the surface of glass.
Narita, Osamu; Makino, Akihiro; *; Maruo, Yoshihiro; Hayashi, Naomi*; *; *; 3 of others*
PNC TN8410 89-005, 94 Pages, 1988/10
None
JRR-2 Control Office; Kambara, Toyozo; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Morozumi, Minoru; Kambayashi, Yuichiro; Shitomi, Hajimu; Kokanezawa, Takashi; et al.
JAERI 1027, 57 Pages, 1962/09
no abstracts in English
