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Ecological and genomic profiling of anaerobic methane-oxidizing archaea in a deep granitic environment

伊能 康平*; Hernsdorf, A. W.*; 今野 勇太*; 幸塚 麻里子*; 柳川 克則*; 加藤 信吾*; 砂村 道成*; 広田 秋成*; 東郷 陽子*; 伊藤 一誠*; et al.

ISME Journal, 12(1), p.31 - 47, 2018/01



Remote radiation imaging system using a compact $$gamma$$-ray imager mounted on a multicopter drone

佐藤 優樹; 小澤 慎吾*; 寺阪 祐太; 冠城 雅晃; 谷藤 祐太; 川端 邦明; 宮村 浩子; 和泉 良*; 鈴木 敏和*; 鳥居 建男

Journal of Nuclear Science and Technology, 55(1), p.90 - 96, 2018/01

 被引用回数:6 パーセンタイル:3.56(Nuclear Science & Technology)

A remote radiation imaging system comprising a lightweight Compton camera and a multicopter drone was developed to remotely and quickly measure radioactive contamination inside the buildings of the Fukushima Daiichi Nuclear Power Station (FDNPS). The drone system is used for measuring detailed radiation distributions in narrow areas, which have been difficult to gauge with conventional aircraft monitoring using helicopters. A measurement of radiation distributions in outdoor environments in the coastal areas of Fukushima, Japan, was performed. The drone system with the Compton camera succeeded in remote observations of dense hotspots from the sky over a contaminated area near the FDNPS. The time required for image reconstruction is approximately 550 s in the case of a 9-m flight altitude for the hotspots with a surface dose rate of several tens of $$mu$$Sv/h. This drone system will be used inside the buildings of the FDNPS for remote measurement of radioactive contamination.


Radiation imaging system using a compact $$gamma$$-ray imager mounted on a remotely operated machine

佐藤 優樹; 川端 邦明; 小澤 慎吾*; 和泉 良*; 冠城 雅晃; 谷藤 祐太; 寺阪 祐太; 宮村 浩子; 河村 拓馬; 鈴木 敏和*; et al.

IFAC-PapersOnLine, 50(1), p.1062 - 1066, 2017/07

The development of remote and quick radiation imaging methods in the high dose-rate environment is requested to accelerate implementation of decommissioning of the Fukushima Dai-ichi Nuclear Power Plant (FDNPP). We developed the remote radiation imaging system consisting of a Compton camera and a multicopter drone to remotely measure the radioactive contamination on the several radioactive fields in the environment and inside the building of nuclear facilities such as the FDNPP. The drone system succeeded in the observation of several hotspots from the sky at the outdoor environments in coastal areas of Fukushima, Japan. In addition, we are now developing the SLAM technology for remotely operated machines such as the drone to complete the remote radiation imaging system, which can autonomous flight.


Mesoscopic structures of vermiculite and weathered biotite clays in suspension with and without cesium ions

元川 竜平; 遠藤 仁*; 横山 信吾*; 小川 紘樹*; 小林 徹; 鈴木 伸一; 矢板 毅

Langmuir, 30(50), p.15127 - 15134, 2014/12

 被引用回数:11 パーセンタイル:45.77(Chemistry, Multidisciplinary)

The effect of cesium (Cs) adsorption on the mesoscopic structure of the clay minerals vermiculite and weathered biotite (WB) in suspensions was elucidated by small-angle X-ray scattering (SAXS). The clay minerals form multilayered structures and the Cs cations are strongly adsorbed in the interlayer space of the soil clays, in particular vermiculite and WB. SAXS was used to monitor the relationship between Cs adsorption at the clay interlayers and the structural changes at length scales from 0.1 to 100 nm. The variation in the distance between the neighboring clay sheets and the spatial arrangement of the clay sheets with and without Cs were clarified. Our quantitative analyses revealed that the number of stacked layers of pure vermiculite was decreased by Cs addition, whereas that of WB increased. Moreover, the average distance between the neighboring layers of vermiculite in suspension was larger than that of WB, which reflects the different conditions of Cs intercalation. These findings provide fundamental insights that are important for predicting the environmental fate of radioactive cesium in contaminated regions and for developing methods for extracting cesium from soil.


Collective structural changes in vermiculite clay suspensions induced by cesium ions

元川 竜平; 遠藤 仁*; 横山 信吾*; 西辻 祥太郎*; 小林 徹; 鈴木 伸一; 矢板 毅

Scientific Reports (Internet), 4, p.6585_1 - 6585_6, 2014/10

 被引用回数:19 パーセンタイル:25.08(Multidisciplinary Sciences)

Following the Fukushima Daiichi nuclear disaster in 2011, Cs radioisotopes have been dispersed over a wide area. Most of the Cs has remained on the surface of the soil because Cs is strongly adsorbed in the interlayer spaces of soil clays, particularly vermiculite. We have investigated the microscopic structure of an aqueous suspension of vermiculite clay over a wide length scale (0.1-100 nm) by small-angle X-ray scattering. We determined the effect of the adsorption behavior of Cs on the structural changes in the clay. It was found that the abruption of the clay sheets was induced by the localization of Cs at the interlayer. This work provides important information for predicting the environmental fate of radioactive Cs in polluted areas, and for developing methods to extract Cs from the soil and reduce radioactivity.


Observation of spontaneously excited waves in the ion cyclotron frequency range on JT-60U

市村 真*; 檜垣 浩之*; 柿本 真吾*; 山口 裕資*; 根本 健樹*; 片野 誠*; 石川 正男; 森山 伸一; 鈴木 隆博

Nuclear Fusion, 48(3), p.035012_1 - 035012_7, 2008/03

 被引用回数:20 パーセンタイル:30.31(Physics, Fluids & Plasmas)

本論文では、JT-60Uにおけるイオンサイクロトロン周波数帯の自発的励起波動の実験的観測に関して報告する。磁場閉じ込めプラズマ中では、非等方速度分布に起因して不安定性が駆動される。中性粒子入射による高エネルギーDイオンによる励起波動と核融合反応イオン($$^{3}$$He, T)による2つのタイプの揺動が観測されている。これらの揺動は、JET, TFTRで観測されるイオンサイクロトロン放射(ICE)と呼ばれるものと同じものと考えられる。本論文では、初めてこれらの励起波動の空間構造を明らかとした。ICRF加熱用のアンテナを磁気プローブとして用い、ポロイダル方向の空間構造を測定し、観測される波動が揺動磁場成分を持つことが明らかとなった。また、トロイダル方向の空間構造からDイオンに起因する揺動は磁場方向の波数が零付近、核融合反応イオンに起因する揺動は有限な波数を持つことが明らかとなった。さらに核融合反応イオンの$$^{3}$$HeとTに関しても異なる構造が観測され、異なるアルベン波動が不安定になることが示唆された。


The H-Invitational Database (H-InvDB); A Comprehensive annotation resource for human genes and transcripts

山崎 千里*; 村上 勝彦*; 藤井 康之*; 佐藤 慶治*; 原田 えりみ*; 武田 淳一*; 谷家 貴之*; 坂手 龍一*; 喜久川 真吾*; 嶋田 誠*; et al.

Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01

 被引用回数:50 パーセンタイル:21.17(Biochemistry & Molecular Biology)



Wave excitation in magnetically confined plasmas with an anisotropic velocity distribution

市村 真*; 檜垣 浩之*; 柿本 真吾*; 山口 裕資*; 根本 健樹*; 片野 誠*; 小澤 功*; 室 大志*; 石川 正男; 森山 伸一; et al.

Fusion Science and Technology, 51(2T), p.150 - 153, 2007/02

 パーセンタイル:100(Nuclear Science & Technology)



Design study and evaluaion of advanced fuel fabrication systems for FBR fuel cycle

川口 浩一; 滑川 卓志; 鈴木 嘉浩; 原口 信吾*

Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13) (CD-ROM), 7 Pages, 2005/05




富山 眞吾*; 松尾 重明*; 松永 絹子*; 鈴木 美穂子*

JNC-TJ7420 2005-054, 295 Pages, 2004/02




Charge transfer in collisions of lithium ions with beryllium through oxygen ions at energies below 32 keV/amu

鈴木 慎悟*; 白井 稔三; 島倉 紀之*

Physica Scripta, T92, p.438 - 440, 2001/07



Inner-shell ionization in high density hot plasma produced by high intensity laser irradiation

森林 健悟; Zhidkov, A. J.*; 佐々木 明; 周藤 佳子; 鈴木 慎悟*

Atomic Collision Research in Japan, No.27, p.1 - 3, 2001/00



Molecular-state treatment of electron capture and excitation in collisions of B$$^{q+}$$(q=1-5) ions with He atoms

島倉 紀之*; 鈴木 偉之; 櫻井 義信*; 鈴木 慎悟*; 季村 峯生*; 白井 稔三

Physica Scripta, T92, p.410 - 414, 2001/00



Short wavelength X-ray emission from inner-shell excited states generated by high intensity laser irradiation on Kr, Xe clusters

森林 健悟; Zhidkov, A. G.; 佐々木 明; 周藤 佳子; 鈴木 慎悟*

Proceedings of 2nd International Conference on Inertial Fusion Sciences and Applications (IFSA 2001), p.1182 - 1185, 2001/00



Spatial variation of D$$alpha$$ line spectral profile and emission process in the divertor region of JT-60U

熊谷 晃*; 久保 博孝; 竹永 秀信; 鈴木 慎悟; 清水 勝宏; 朝倉 伸幸; 嶋田 道也

Plasma Physics and Controlled Fusion, 42(5), p.529 - 543, 2000/05

 被引用回数:13 パーセンタイル:57.99(Physics, Fluids & Plasmas)



Heating and non-inductive current drive by negative ion based NBI in JT-60U

及川 聡洋; 牛草 健吉; Forest, C. B.*; 根本 正博; 内藤 磨; 草間 義紀; 鎌田 裕; 飛田 健次; 鈴木 慎悟*; 藤田 隆明; et al.

Nuclear Fusion, 40(3Y), p.435 - 443, 2000/03

 被引用回数:34 パーセンタイル:24.6(Physics, Fluids & Plasmas)



Spectroscopic study of JT-60U divertor plasma

久保 博孝; 東島 智; 竹永 秀信; 熊谷 晃*; 清水 勝宏; 杉江 達夫; 鈴木 慎悟; 逆井 章; 朝倉 伸幸

NIFS-PROC-44, p.65 - 68, 2000/01



Electron capture processes in collisions between Be$$^{q+}$$ ions and He atoms

鈴木 慎悟; Guly$'a$s, L.; 島倉 紀之*; Fainstein, P. D.*; 白井 稔三

Journal of Physics B; Atomic, Molecular and Optical Physics, 33(17), p.3307 - 3318, 2000/00




仲野 友英; 久保 博孝; 杉江 達夫; 東島 智; 鈴木 慎悟*; 逆井 章; 伊丹 潔

JAERI-Research 99-003, 16 Pages, 1999/01


臨界プラズマ試験装置JT-60Uのダイバータプラズマにおける不純物挙動を調べるために、可視領域(300~780nm)のスペクトルを観測した。観測の結果、DI,HeI-II,BII,CII-IV,OI-IIIからのスペクトル線とCD及びC$$_{2}$$分子のスペクトルバンドが同定された。軽元素不純物のスペクトル線は、主量子数の変化を伴わない遷移($$Delta$$n=0)によるものが多く観測され、主量子数の変化を伴う遷移($$Delta$$n$$neq$$0)では方位量子数が大きい準位間の遷移が観測された。C$$_{2}$$分子のスペクトルバンドはSwan bandと同定された。


Monte Carlo simulation of hellium atoms and ions in JT-60U W-shaped divertor

鈴木 慎悟*; 清水 勝宏; 久保 博孝; 白井 稔三; 逆井 章; 杉江 達夫; 朝倉 伸幸

Europhysics Conference Abstracts, 23J, p.477 - 480, 1999/00


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