Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
/MgO] for prompt and efficient adsorption of ciprofloxacin from aqueous solutionsFalyouna, O.*; Bensaida, K.*; Maamoun, I.; Ashik, U. P. M.*; Tahara, Atsushi*; Tanaka, Kazuya; Aoyagi, Noboru; Sugihara, Yuji*; Eljamal, O.*
Journal of Cleaner Production, 342, p.130949_1 - 130949_15, 2022/03
Times Cited Count：84 Percentile：97.67(Green & Sustainable Science & Technology)Muramatsu, Toshiharu; Sato, Yuji; Kamei, Naomitsu; Aoyagi, Yuji*; Shobu, Takahisa
Nihon Kikai Gakkai Dai-13-Kai Seisan Kako, Kosaku Kikai Bumon Koenkai Koen Rombunshu (No.19-307) (Internet), p.157 - 160, 2019/10
no abstracts in English
Muramatsu, Toshiharu; Aoyagi, Yuji*; Yoshiuji, Takahiro*
Nihon Kikai Gakkai 2017-Nendo Nenji Taikai Koen Rombunshu (DVD-ROM), 4 Pages, 2017/09
A general-purpose three-dimensional thermohydraulics numerical simulation code SPLICE was developed at Japan Atomic Energy Agency and designed to deal with gas-liquid-solid consolidated incompressible viscous flows with a phase change process in various laser applications, such as welding, coating, cutting, etc. The result obtained from metal powder laser additive manufacturing simulations is very encouraging in the sense that the SPLICE code would be used as one of efficient tools to provide the laser irradiation conditions.
Aso, Tomokazu; Teshigawara, Makoto; Hasegawa, Shoichi; Aoyagi, Katsuhiro*; Muto, Hideki*; Nomura, Kazutaka*; Takada, Hiroshi; Ikeda, Yujiro
JAEA-Technology 2017-021, 75 Pages, 2017/08
JAEA-Technology-2017-021.pdf:33.03MB
Liquid hydrogen is employed as a cold neutron moderator material at the spallation neutron source of Materials and Life science experimental Facility of Japan Proton Accelerator Research Complex (J-PARC). From January 2015, it became observable that the differential pressure between heat exchangers and an 80 K adsorber (ADS) in a helium refrigerator system increased with operating time. In November 2015, the differential pressure rise became more significant, leading to degrade the refrigerating performance in cooling liquid hydrogen. In order to investigate the cause of the abnormal differential pressure rise between the heat exchangers and the ADS, we carried out visual inspection inside the heat exchangers and analyzed the impurities contained in the helium gas. Unfortunately, we could not identify the impurities causing the performance degradation, but observed a trace of oil in the inlet piping of the heat exchanger. Based on investigations of the abnormal events occurred in the refrigerators with similar refrigerating capacity at other facilities, we took measures that cleaning the heat exchangers with Freon and replacing the ADS with new one. As a result, the differential pressure rise phenomenon was removed to recover the performance. We have detected oil from the Freon used for cleaning the heat exchangers and at a felt supporting charcoal packed in the ADS. In particular, oil was accumulated in membranous form onto the felt at the entrance side in the ADS. The amount of oil contained in the helium gas was about 10 ppb or so, less than the design value, in the helium refrigerator. However, the oil accumulated onto the felt in the ADS through long operating period may cause abnormal differential pressure rise, leading to the performance degradation of the helium refrigerator. Further study is needed to specify the cause more clearly.
Terunuma, Akihiro; Mimura, Ryuji; Nagashima, Hisao; Aoyagi, Yoshitaka; Hirokawa, Katsunori*; Uta, Masato; Ishimori, Yuu; Kuwabara, Jun; Okamoto, Hisato; Kimura, Yasuhisa; et al.
JAEA-Review 2016-008, 98 Pages, 2016/07
JAEA-Review-2016-008.pdf:11.73MB
Japan Atomic Energy Agency formulated the plan to achieve the medium-term target in the period of April 2010 to March 2015(hereinafter referred to as "the second medium-term plan"). JAEA determined the plan for the business operations of each year (hereinafter referred to as "the year plan"). This report is that the Sector of Decommissioning and Radioactive Waste Management has summarized the results of the decommissioning technology development and decommissioning of nuclear facilities which were carried out in the second medium-term plan.
Inagaki, Daisuke*; Tsusaka, Kimikazu*; Aoyagi, Kazuhei; Nago, Makito*; Ijiri, Yuji*; Shigehiro, Michiko*
Proceedings of ITA-AITES World Tunnel Congress 2015 (WTC 2015)/41st General Assembly, 10 Pages, 2015/05
adsorbed on kaolinite by time-resolved laser fluorescence spectroscopy (TRLFS) and parallel factor analysis (PARAFAC)Ishida, Keisuke*; Saito, Takumi*; Aoyagi, Noboru; Kimura, Takaumi; Nagaishi, Ryuji; Nagasaki, Shinya*; Tanaka, Satoru*
Journal of Colloid and Interface Science, 374(1), p.258 - 266, 2012/05
Times Cited Count：40 Percentile：65.56(Chemistry, Physical)Aoyagi, Noboru; Shimojo, Kojiro; Brooks, N. R.*; Nagaishi, Ryuji; Naganawa, Hirochika; Van Hecke, K.*; Van Meervelt, L.*; Binnemans, K.*; Kimura, Takaumi
Chemical Communications, 47(15), p.4490 - 4492, 2011/04
Times Cited Count：41 Percentile：68.73(Chemistry, Multidisciplinary)Nagaishi, Ryuji; Yamada, Reiji; Aoyagi, Noboru; Sugo, Yumi
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 161, 2008/03
From the standpoints of utilization of radioactive wastes, and of sophistication of separation process of spent fuels, we have been investigating promotion or inhibition of radiation-induced reactions in immiscible heterogeneous systems: solutions coexisting/contacting with solid oxides, solvent system with aqueous and organic phases, etc.. We have recently report that the reactions of reduction of metal ions and of hydrogen production in aqueous solution were promoted by adding oxide particles to the solution, and that the radiolysis of amides in n-dodecane was dependent on aqueous solution contacting with the n-dodecane. In this report, we illustrate recover of platinum-group elements from aqueous solution, and non-toxic treatment of chrysotile asbestos using ionizing radiations as the experimental results found in fiscal 2006.
Aoyagi, Noboru; Nagaishi, Ryuji; Esaka, Fumitaka; Yamada, Reiji
Chemistry Letters, 36(7), p.890 - 891, 2007/07
Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)A high yield of H gas was unprecedentedly produced due to the radiolysis of water containing asbestos while the morphology of them turned fibrous bundles into non-fibrous particles in 0.40 M HSO
solution over 2.0 MGy dose of irradiation. In conclusion, irradiation against asbestos in solutions can promote the hydrogen gas production and cause the morphological change of chrysotile without providing heat or chemicals.
Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Matsushita, Tomohiro*; Saito, Yuji; Mizumaki, Masaichiro*; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; et al.
Hoshako, 14(5), p.339 - 348, 2001/11
no abstracts in English
Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; Takeuchi, Masao*; et al.
Review of Scientific Instruments, 72(8), p.3191 - 3197, 2001/08
Times Cited Count：21 Percentile：70.49(Instruments & Instrumentation)no abstracts in English
Yoshida, Zenko; Aoyagi, Hisao; ; Takeishi, Hideyo; Sasaki, Yuji; Uno, Seiichiro; Tachikawa, Enzo
Journal of Alloys and Compounds, 213-214, p.453 - 455, 1994/00
Times Cited Count：10 Percentile：61.70(Chemistry, Physical)no abstracts in English
in high-T
superconducting La
Sr
CuO
pellet by flow-coulometrySasaki, Yuji; Aoyagi, Hisao; Takeishi, Hideyo; Yoshida, Zenko
Physica C, 191, p.347 - 353, 1992/00
Times Cited Count：7 Percentile：55.21no abstracts in English
Sasaki, Yuji; Aoyagi, Hisao; Takeishi, Hideyo; Yoshida, Zenko
Analytical Sciences, 7(Suppl.), p.1201 - 1204, 1991/00
no abstracts in English
Aoyagi, Noboru; Shimojo, Kojiro; Nagaishi, Ryuji; Toraishi, Takashi*; Watanabe, Masayuki; Kimura, Takaumi
no journal, ,
Metal-containing ionic liquids such as [C
mim][AlCl] and [Cmim][FeCl], have been received much attention in synthetic, catalytic, electrochemical, magnetic application and so on. In the present study, we report the syntheses, and spectral properties to discuss the coordination geometries of uranyl isothiocyanate since no complex is known for 
3 in any solvents ( is the number of coordinated ligands). All materials, [Cmim][U
O(NCS)
(HO)
](
= 1 - 3), exhibited brilliant colors: wine red - crimson - orange. Also, the first thermochromism of actinide compounds were found.
Nagaishi, Ryuji; Aoyagi, Noboru; Shinha, Yusuke; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Radiolytic reactions in ionic liquids of thiocyanate salts were studied by means of the nano-second pulse radiolysis technique. One of the significant ionization sites of liquids was found out to be thiocyanate ion by observing direct formation of its dimer radical ion, not 
the diffusive encounter between thiocyanate radical and ion. The formation and reaction behaviors of solvated electron and dimer were examined by changing the composition of liquids and by adding electron scavengers to the liquid.
Nagaishi, Ryuji; Aoyagi, Noboru; Shinha, Yusuke; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Radiolytic behavior of ionic liquids of thiocyanate salts was studied by using the ns-pulse radiolysis technique. The transient absorption of thiocyante dimer radical ion was observed in the liquids, and the rise was within the width of electron pulse. The maximum absorbance of dimer in the liquids was equivalent to that in aqueous solutions, where the dimer is formed from the reaction of thiocyanate ion with OH, and increased linearly with increasing the thiocyanate concentration in the liquids. These indicate that one of the ionization sites of liquids should be thiocyanate ion.
Nagaishi, Ryuji; Aoyagi, Noboru; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Radiolytic behavior of ionic liquids having thiocyanate ion as a constituent, of which the reactions with radiolysis products of water are well known, was studied by using the ns-pulse radiolysis technique to clarify the ionization sites and the presence of geminate radical formed together with electron in the liquids. The transient absorption of thiocyante dimer radical ion was observed in the liquids, and the rise was within the pulse width. The maximum absorbance of dimer in the liquids was equivalent to that in aqueous solutions, where the dimer is formed from the reaction of thiocyanate ion with OH radical, and increased with increasing the thiocyanate concentration in the liquids. These indicate that one of the ionization sites of liquids should be thiocyanate ion, leading to the formation of electron and thiocyanate radical. Difference in the radiolytic behavior between imidazolium and ammonium salts, and the ps-pulse radiolysis will be also discussed.
Nagaishi, Ryuji; Aoyagi, Noboru; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Reaction behaviors of radiolysis products in mixtures of different ionic liquids containing thiocyanate anion were studied by measuring the transient absorptions under irradiation of electron pulses. Dimer radical ion of thiocyanate in the visible range and electron in the near-infrared range were observed in the ns-pulse radiolysis to measure their yields and reactions. The formations of products increased with increasing the thiocyanate concentration, regardless of kinds of cations in the mixture. The products were also observed in the ps-pulse radiolysis to clarify their formation pathways.
