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Journal Articles

Rail DRAGON: Long-reach Bendable Modularized Rail Structure for Constant Observation inside PCV

Yokomura, Ryota*; Goto, Masataka*; Yoshida, Takehito*; Warisawa, Shinichi*; Hanari, Toshihide; Kawabata, Kuniaki; Fukui, Rui*

IEEE Robotics and Automation Letters (Internet), 9(4), p.3275 - 3282, 2024/04

To reduce errors in the remote control of robots during decommissioning, we developed a Rail DRAGON, which enables continuous observation of the work environment. The Rail DRAGON is constructed by assembling and pushing a long rail structure inside the primary containment vessel (PCV), and then repeatedly deploying several monitoring robots on the rails to enable constant observation in a high-radiation environment. In particular, we have developed the following components of Rail DRAGON: bendable rail modules, straight rail modules, a basement unit, and monitoring robots. Concretely, this research proposes and demonstrates a method to realize an ultralong articulated structure with high portability and workability. In addition, it proposes and verifies the feasibility of a method for deploying observation equipment that can be easily deployed and replaced, while considering disposal.

Journal Articles

Magnetic-impurity-induced modifications to ultrafast carrier dynamics in the ferromagnetic topological insulators Sb$$_{2-x}$$V$$_{x}$$Te$$_{3}$$

Sumida, Kazuki*; Kakoki, Masaaki*; Reimann, J.*; Nurmamat, M.*; Goto, Shinichi*; Takeda, Yukiharu; Saito, Yuji; Kokh, K. A.*; Tereshchenko, O. E.*; G$"u$dde, J.*; et al.

New Journal of Physics (Internet), 21(9), p.093006_1 - 093006_8, 2019/09

 Times Cited Count:10 Percentile:65.58(Physics, Multidisciplinary)

Journal Articles

Electrochemical Cs removal and crystal formation from Fukushima weathered biotite in molten NaCl-CaCl$$_{2}$$

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Yaita, Tsuyoshi; Suzuki, Shinichi*

AIMS Electronics and Electrical Engineering (Internet), 3(2), p.102 - 110, 2019/03

The possibility of removal and controlling crystal formation from weathered biotite (WB) in clay minerals were investigated using molten salt electrochemistry (EC) in molten NaCl-CaCl$$_{2}$$ under an electrochemical reductive reaction. Cyclic Voltammogram (CV) measurements were performed in the range of +0.5 V to -2.2 V. Several peaks were confirmed in the CV spectra. The peak at -1.4 V represents a reduction reaction of Fe in WB, so we conducted an experiment at -1.4 V for 2 h to reduce Iron (Fe). The Cs removal rate after EC treatment was determined by X-ray fluorescence analysis, and almost 100% Cs removal was confirmed. To understand the effect of the reductive reaction, we performed X-ray Adsorption Fine Structure (XAFS) analysis. Before EC treatment, the Fe in WB was present as a mixture of Fe$$^{3+}$$ and Fe$$^{2+}$$. After EC treatment, the presence of Fe$$^{2+}$$ was confirmed by XAFS analysis. Based on this finding, EC treatment is effective for reducing Fe in WB. This result indicated that Fe$$_{2}$$O$$_{3}$$ formation was suppressed, and the reduction reaction was effective for controlling crystal formation.

Journal Articles

Simultaneous measurement of neutron-induced fission and capture cross sections for $$^{241}$$Am at neutron energies below fission threshold

Hirose, Kentaro; Nishio, Katsuhisa; Makii, Hiroyuki; Nishinaka, Ichiro*; Ota, Shuya*; Nagayama, Tatsuro*; Tamura, Nobuyuki*; Goto, Shinichi*; Andreyev, A. N.; Vermeulen, M. J.; et al.

Nuclear Instruments and Methods in Physics Research A, 856, p.133 - 138, 2017/06

 Times Cited Count:3 Percentile:44.94(Instruments & Instrumentation)

Oral presentation

Liquid-liquid extraction of lanthanides into ionic liquids with a multidentate ligand

Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Yaita, Tsuyoshi; Suzuki, Shinichi; Goto, Masahiro*

no journal, , 

The extraction behavior of lanthanides from aqueous solutions into ionic liquids (ILs) and the stripping test have been investigated with N, N, N', N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) as a ligand. TPEN in ILs shows the extremely high extraction performance for lanthanides compared to that in chloroform. The stripping of lanthanides from ILs into a receiving phase is successfully achieved under acidic conditions. Furthermore, the leaching of TPEN from ILs into the receiving phase is negligible small, although almost all TPEN molecules in chloroform readily leach.

Oral presentation

Cesium removal and separate from Fukushima weathered biotite using molten salt electrochemistry

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Cesium removal and separate from Fukushima weathered biotite using molten salt electrochemistry

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Cesium removal and separate from Fukushima weathered biotite using molten salt electrochemistry

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Cesium removal and separate from contaminated soil using molten salt electrochemistry and it structure analysis

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Removal of cesium from contaminated soil and field effect using molten salt electrochemical method

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Electrochemical control of multi crystal formation from clay mineral in molten NaCl-CaCl$$_{2}$$

Honda, Mitsunori; Sakanaka, Yoshihide*; Goto, Takuya*; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

Oral presentation

Cesium removal and reductive effect from Fukushima weathered biotite using molten NaCl-CaCl$$_{2}$$

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Hasegawa, Yuri; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Removal of cesium from contaminated soil by molten salt electrochemical method and elucidation of electrolytic reduction effect by XAFS analysis

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Molten salt electrochemical Cs removal and crystal formation from weathered biotite toward energy material creations

Honda, Mitsunori; Goto, Takuya*; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

14 (Records 1-14 displayed on this page)
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