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論文

Local structure investigations of accumulated damage in irradiated MgAl$$_{2}$$O$$_{4}$$

吉岡 聰*; 鶴田 幸之介*; 山本 知一*; 安田 和弘*; 松村 晶*; 杉山 武晴*; 大場 洋次郎; 石川 法人; 小林 英一*; 奥平 幸司*

Journal of the American Ceramic Society, 103(8), p.4654 - 4663, 2020/08

 被引用回数:0 パーセンタイル:100(Materials Science, Ceramics)

高速重イオン照射によりMgAl$$_{2}$$O$$_{4}$$スピネルに形成された損傷組織をX線吸収端近傍構造解析(XANES)とX線小角散乱法(SAXS)を用いて調べた。照射量が増加するとSAXSとXANESの両方で変化が見られた。SAXSでは、照射部に直径5nmの円柱状のイオントラックが観測された。XANESの結果は、四面体位置と八面体位置の間でカチオンの無秩序化が生じていることを示すものであった。さらに、XANESスペクトルの定量的な解析により、高照射量ではカチオンが八面体位置を優先的に占有することがわかった。

論文

Revising the 4${it f}$ symmetry in CeCu$$_{2}$$Ge$$_{2}$$; Soft X-ray absorption and hard X-ray photoemission spectroscopy

荒谷 秀和*; 中谷 泰博*; 藤原 秀紀*; 川田 萌樹*; 金井 惟奈*; 山神 光平*; 藤岡 修平*; 濱本 諭*; 久我 健太郎*; 木須 孝幸*; et al.

Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09

AA2018-0352.pdf:1.16MB

 被引用回数:3 パーセンタイル:64.52(Materials Science, Multidisciplinary)

We present a detailed study on the $$4f$$ ground state symmetry of the pressure-induced superconductor CeCu$$_2$$Ge$$_2$$ probed by soft X-ray absorption and hard X-ray photoemission spectroscopy. The revised Ce $$4f$$ ground states are determined as $$|{Gamma_7}rangle=sqrt{0.45}|{J_{z}=pm frac{5}{2}}rangle - sqrt{0.55}|{mp frac{3}{2}}rangle$$ with $$Sigmamathchar`-{rm type}$$ in-plane rotational symmetry. This gives an in-plane magnetic moment consistent with the antiferromagnetic moment as reported in neutron measurements. Since the in-plane symmetry is the same as that for the superconductor CeCu$$_2$$Si$$_2$$, we propose that the charge distribution along the $$c$$-axis plays an essential role in driving the system into a superconducting phase.

論文

X-ray absorption near edge structure and first-principles spectral investigations of cationic disorder in MgAl$$_{2}$$O$$_{4}$$ induced by swift heavy ions

吉岡 聰*; 鶴田 幸之介*; 山本 知一*; 安田 和弘*; 松村 晶*; 石川 法人; 小林 英一*

Physical Chemistry Chemical Physics, 20(7), p.4962 - 4969, 2018/02

 被引用回数:2 パーセンタイル:78.62(Chemistry, Physical)

MgAl$$_{2}$$O$$_{4}$$中のカチオン(Mg, Al)は、通常は秩序だったサイトに配置されている。Mgは四面体位置、Alは八面体位置にある。しかし、スピネルに高速重イオンを照射すると、スピネル中のカチオンの配置が無秩序になることが予想される。カチオン配置の秩序度の変化を、放射光を利用したエックス線吸収端近傍構造の測定により評価した。その結果得られた実験データを、第一原理計算の結果と比較することによって、以下のことが分かった。照射に伴うMgの配置の変化とAlの配置の変化が整合しており、MgがAlサイトに、AlがMgサイトに乗り移る無秩序化が進んでいることが分かった。高照射量(1$$times$$10$$^{13}$$ ions/cm$$^{2}$$)では、完全な配置の無秩序化が達成されることがわかった。

論文

Prediction method of improved residual stress distribution by shot peening using large scale analysis method

生島 一樹*; 柴原 正和*; 西川 聡*; 古川 敬*; 秋田 貢一; 鈴木 裕士; 諸岡 聡

E-Journal of Advanced Maintenance (Internet), 9(3), p.NT87_1 - NT87_5, 2017/11

In this work, an analysis system that can analyze the modification of the residual stress distribution by peening is proposed based on IEFEM. In the proposed analysis system, IEFEM is extended to consider the dynamic effect to analyze the dynamic phenomenon with an impulsive load. The impulsive load due to the collision of shots is modeled as an equivalent load model. The equivalent load model is integrated with IEFEM considering the dynamic effect to calculate spatially and temporally random load in dynamic analyses. Using the proposed analysis system, the residual stress distribution modification by shot peening in a multi-pass welded pipe joint is predicted. The residual stress distributions obtained by the analysis are compared with those measured by X-ray diffraction (XRD), and the effect of the number of shot collisions on the change in residual stress distribution is discussed.

論文

In-situ residual stress analysis during thermal cycle of a dissimilar weld joint using neutron diffraction and IEFEM

秋田 貢一; 柴原 正和*; 生島 一樹*; 西川 聡*; 古川 敬*; 鈴木 裕士; Harjo, S.; 川崎 卓郎; Vladimir, L.*

溶接学会論文集(インターネット), 35(2), p.112s - 116s, 2017/06

Residual stresses near the weld metal of the joints before and after a thermal cycle were measured using a reactor based neutron diffraction technique in room temperature. In-situ residual stress measurements were performed on the plate type sample using a pulsed neutron diffraction technique under thermal cycles. Residual stress behaviors of the samples were examined also by the idealized explicit FEM (IEFEM), which agreed well with the experimental results of the residual stress behaviors during thermal cycles. Thermal stresses were induced near the weld metal by the difference of the linear expansion coefficients of the dissimilar base metals. Since the thermal stress exceeded the yield stress of the material during the first heating process, the residual stresses near the weld metal were redistributed and a part of the residual stress was relaxed.

論文

Study on shot peened residual stress distribution under cyclic loading by numerical analysis

生島 一樹*; 木谷 悠二*; 柴原 正和*; 西川 聡*; 古川 敬*; 秋田 貢一; 鈴木 裕士; 諸岡 聡

溶接学会論文集(インターネット), 35(2), p.75s - 79s, 2017/06

In this research, to investigate the effect of shot peening on operation, an analysis method to predict the behavior of stress distribution on shot peening was proposed. In the proposed system, the load distribution on the collision of shots was modeled, and it was integrated with the dynamic analysis method based on the Idealized explicit FEM (IEFEM). The thermal elastic plastic analysis method using IEFEM was applied to the analysis of residual stress distribution of multi-pass welded pipe joint. The computed residual stress distribution was compared with the measured residual stress distribution using X-ray diffraction (XRD). As a result, it was shown that the both welding residual stress distribution agree well with each other. Considering the computed welding residual stress distribution, the modification of stress distribution due to shot peening was predicted by the proposed analysis system.

論文

Numerical analysis of residual stress distribution on peening process

生島 一樹*; 柴原 正和*; 秋田 貢一; 鈴木 裕士; 諸岡 聡; 西川 聡*; 古川 敬*

Welding in the World, 61(3), p.517 - 527, 2017/05

本研究では、先ず、ショットピーニングプロセスにおける残留応力の挙動を予測するための解析手法を提案した。この手法ではショットの衝突時の荷重分布をモデル化し、さらに、理想化陽解法FEM解析手法(IEFEM)に基づく動的解析法と組み合わせた。提案した解析システムの解析精度は、ショット一発が衝突した際の応力分布をABAQUSによる解析結果と比較することで確認した。IEFEMを用いて熱弾塑性解析を実施し、配管のマルチパス溶接における溶接残留応力の解析を実施し、解析結果をX線回折による残留応力測定結果と比較し、両者がよく一致することを確認した。次いで、ショットピーニングによる溶接残留応力の変化を提案システムによって解析した。その結果、多量のショットを衝突した場合の残留応力は、解析と実験とでよく一致した。

論文

Large trigonal-field effect on spin-orbit coupled states in a pyrochlore iridate

植松 大介*; 佐賀山 基*; 有馬 孝尚*; 石川 洵*; 中辻 知*; 高木 英典*; 吉田 雅洋*; 水木 純一郎; 石井 賢司

Physical Review B, 92(9), p.094405_1 - 094405_6, 2015/09

 被引用回数:15 パーセンタイル:32.98(Materials Science, Multidisciplinary)

The half-filled topmost valence band of Ir$$^{4+}$$ in several iridates such as Sr$$_2$$IrO$$_4$$, IrO$$_2$$, and CaIrO$$_3$$ has been proposed to originate mainly from the spin-orbit coupled $$J_{rm eff}=1/2$$ states. In pyrochlore iridates $$R_2$$Ir$$_2$$O$$_7$$ ($$R$$: rare earth), some exotic electronic states are theoretically proposed by assuming $$J_{rm eff}=1/2$$ states. However, the octahedral coordination around Ir is trigonally distorted, which may affect the energy level scheme of Ir $$5d$$ states. Here, we report spectra of resonant elastic and inelastic X-ray scattering in Eu$$_2$$Ir$$_2$$O$$_7$$ at the Ir $$L$$ edges. A large suppression of the magnetic scattering signal at the Ir $$L_{rm II}$$ edge supports the $$J_{rm eff}=1/2$$ picture rather than the $$S=1/2$$ one. The inelastic scattering spectrum indicates that the magnitude of the trigonal field on the Ir$$^{4+}$$ states is evaluated to be comparable to the spin-orbit interaction. The energy diagram of the $$5d$$ state is proposed based on the simple cluster model.

論文

Route and regulation of zinc, cadmium, and iron transport in rice plants (${it Oryza sativa}$ L.) during vegetative growth and grain filling; Metal transporters, metal speciation, grain Cd reduction and Zn and Fe biofortification

米山 忠克*; 石川 覚*; 藤巻 秀

International Journal of Molecular Sciences (Internet), 16(8), p.19111 - 19129, 2015/08

AA2015-0336.pdf:1.94MB

 被引用回数:54 パーセンタイル:21.29(Biochemistry & Molecular Biology)

Zinc (Zn), iron (Fe) concentrations in rice grains harvested under different levels in soil are known to change only within a small range, while cadmium (Cd) concentrations show greater changes. To clarify the mechanisms underlying such difference, we synthesized information on the routes of metal transport and accumulation in rice plants. At grain-filling, Zn and Cd ascending in xylem are transferred to the phloem at stem nodes. Grain Fe is largely derived from the leaves by remobilization. Zn and Fe concentrations in phloem-sap and grains are regulated within a small range, while Cd concentrations vary depending on xylem supply. To increase concentrations of the metal chelators are effective in increasing grain Zn and Fe concentrations. The elimination of OsNRAMP5 Cd-uptake transporter and the enhancement of root-cell vacuolar Cd sequestration reduce uptake and root-to-shoot transport, respectively, resulting in a reduction of grain Cd accumulation.

論文

Bipartite magnetic parent phases in the iron oxypnictide superconductor

平石 雅俊*; 飯村 壮史*; 小嶋 健児*; 山浦 淳一*; 平賀 晴弘*; 池田 一貴*; Miao, P.*; 石川 喜久*; 鳥居 周輝*; 宮崎 正範*; et al.

Nature Physics, 10(4), p.300 - 303, 2014/04

 被引用回数:80 パーセンタイル:3.66(Physics, Multidisciplinary)

High-temperature (high-$$T_{rm c}$$) superconductivity appears as a consequence of the carrier-doping of an undoped parent compound exhibiting antiferromagnetic order; thereby, ground-state properties of the parent compound are closely relevant to the superconducting state. On the basis of the concept, a spin-fluctuation has been addressed as an origin of pairing of the superconducting electrons in cuprates. Whereas, there is growing interest in the pairing mechanism such as an unconventional spin-fluctuation or an advanced orbital-fluctuation due to the characteristic multi-orbital system in iron-pnictides. Here, we report the discovery of an antiferromagnetic order as well as a unique structural transition in electron-overdoped LaFeAsO$$_{1-x}$$H$$_x$$ ($$x sim 0.5$$), whereby another parent phase was uncovered, albeit heavily doped. The unprecedented two-dome superconducting phases observed in this material can be interpreted as a consequence of the carrier-doping starting from the original at $$x sim 0$$ and advanced at $$x sim 0.5$$ parent phases toward the intermediate region. The bipartite parent phases with distinct physical properties in the second magnetic phase provide us with an interesting example to illustrate the intimate interplay among the magnetic interaction, structural change and orbital degree of freedom in iron-pnictides.

論文

Whole-plant imaging of $$^{107}$$Cd distribution using positron-emitting tracer imaging system

鈴井 伸郎; 尹 永根; 井倉 将人*; 石井 里美; 河地 有木; 石川 覚*; 藤巻 秀

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 101, 2014/03

We have conducted noninvasive imaging of cadmium (Cd) in intact plants using a positron-emitting tracer imaging system (PETIS) and $$^{107}$$Cd for the purpose of understanding the mechanism of Cd translocation in plants. In our typical imaging experiment, $$^{107}$$Cd tracer has been fed to the root of large plants such as rice, and obtain the serial images of $$^{107}$$Cd distribution in the underground parts (roots and culture solutions) or the aerial parts (shoots or grains). However, whole-plant images of $$^{107}$$Cd distribution in both underground and aerial parts have not been obtained because the field of view (FOV) of PETIS is limited. In this study, we fed $$^{107}$$Cd to dwarf plants, ${it Sedum plumbizincicola}$ and visualized Cd dynamics in a whole plant within the FOV of PETIS. As a result, the whole physiological process, i.e., uptake from culture solution, translocation from root to shoot and accumulation in shoot, were successfully visualized in the single imaging experiment. The time courses of Cd amounts demonstrated that the half amount of Cd fed to the solution was taken up by the root within 2 hours, and the two-thirds amount was accumulated in the shoot after 30 hours. These results imply the whole-plant imaging represents a reliable tool for the quantitative analysis of Cd dynamics.

論文

Nitrate facilitates cadmium uptake, transport and accumulation in the hyperaccumulator ${it Sedum plumbizincicola}$

Hu, P.*; 尹 永根; 石川 覚*; 鈴井 伸郎; 河地 有木; 藤巻 秀; 井倉 将人*; Yuan, C.*; Huang, J.*; Li, Z.*; et al.

Environmental Science and Pollution Research, 20(9), p.6306 - 6316, 2013/09

 被引用回数:31 パーセンタイル:24.63(Environmental Sciences)

${it Sedum plumbizincicola}$, a species in the family Crassulaceae, has been reported to be a Cd hyperaccumulator exhibiting fast growth, large biomass, asexual reproduction and perennial habit and showing remarkable potential in the phytoextraction of Cd from polluted soils. The aims of this study are to investigate whether and how the nitrogen form (nitrate (NO$$_{3}$$$$^{-}$$) versus ammonium (NH$$_{4}$$$$^{+}$$)) influences cadmium (Cd) uptake and translocation and subsequent Cd phytoextraction by the ${it S. plumbizincicola}$. This is the first report of successful visualisation and quantification of Cd uptake and root-to-shoot translocation in intact plants of the hyperaccumulator species ${it S. plumbizincicola}$ supplied with different forms of inorganic N using positron-emitting tracer imaging system (PETIS), a real-time imaging method.

論文

Real-time imaging and analysis of differences in cadmium dynamics in rice cultivars (${it Oryza sativa}$) using positron-emitting $$^{107}$$Cd tracer

石川 覚*; 鈴井 伸郎; 伊藤 小百合*; 石井 里美; 井倉 将人*; 安部 匡*; 倉俣 正人*; 河地 有木; 藤巻 秀

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 91, 2013/01

We have visualized and quantitatively analysed the real-time Cd dynamics from roots to grains in typical rice cultivars that differed in grain Cd concentrations. We used positron-emitting $$^{107}$$Cd tracer and an innovative imaging technique, PETIS. A new method for direct and real-time visualization of the Cd uptake by the roots in the culture was first realized in this work. Imaging and quantitative analyses revealed the different patterns in time-varying curves of Cd amounts in the roots of rice cultivars tested. Three low-Cd accumulating cultivars showed rapid saturation curves, whereas three high-Cd accumulating cultivars were characterized by curves with a peak within 30 min after $$^{107}$$Cd supplementation, and a subsequent steep decrease resulting in maintenance of lower Cd concentrations in their roots. This difference in Cd dynamics may be attributable to OsHMA3 transporter protein, which was recently shown to be involved in Cd storage in root vacuoles and not functional in the high-Cd accumulating cultivars. Moreover, the PETIS analyses revealed that the high-Cd accumulating cultivars were characterized by rapid and abundant Cd transfer to the shoots from the roots, a faster transport velocity of Cd to the panicles, and Cd accumulation at high levels in their panicles, passing through the nodal portions of the stems where the highest Cd intensities were observed.

論文

Ion-beam irradiation, gene identification, and marker-assisted breeding in the development of low-cadmium rice

石川 覚*; 石丸 泰寛*; 伊倉 将人*; 倉俣 正人*; 阿部 薫*; 瀬野浦 武志*; 長谷 純宏; 荒尾 知人*; 西澤 直子*; 中西 啓仁*

Proceedings of the National Academy of Sciences of the United States of America, 109(47), p.19166 - 19171, 2012/11

 被引用回数:210 パーセンタイル:0.35(Multidisciplinary Sciences)

コメは食品を経由するカドミウム摂取の主要経路の1つであるが、コメのカドミウム汚染を大幅に低減させる技術は開発されていない。われわれはイオンビーム照射によって、コメの粒にカドミウムをほとんど蓄積しないイネ変異体を獲得し、さらに責任遺伝子を同定した。われわれは、低カドミウム濃度を示す3つの変異体を獲得し、それぞれが同一の遺伝子(${it OsNRAMP5}$)に異なる変異を持つこと、並びに変異型${it osnramp5}$によってコードされるトランスポーターが根におけるカドミウム輸送能を欠損することを明らかにした。カドミウム汚染水田において、変異体は低カドミウム濃度の形質を示し、それ以外の農業形質には影響が認められなかった。さらに、変異型${it osnramp5}$を持つイネ新品種を開発するためのDNAマーカーを開発した。われわれの発見はコメのカドミウム汚染低減に大きく貢献するものである。

論文

異種材料溶接継手の残留応力解析

鈴木 賢治*; 山岸 葵*; 西川 聡*; 菖蒲 敬久

保全学, 11(2), p.91 - 98, 2012/07

本研究では、オーステナイト系ステンレス鋼SUS316L及びニッケル基超合金NCF600を母材とした異種材平板の突合わせ溶接継手の残留応力について実材料表面残留応力分布計測及び熱弾塑性有限要素解析を行った。その結果、測定からは溶接部内部に弾塑性有限要素解析では見られない非対称な圧縮応力分布が発生していることを明らかにした。今後この差を解明するために結晶配向、弾塑性異方性なども含めたより詳細な研究が必須であり、それにより、より信頼性の高い弾塑性有限要素解析が可能になると期待できる。

論文

USP処理した異材溶接継手の熱負荷前後における残留応力マッピング

秋田 貢一; 鈴木 裕士; 西川 聡*; 大北 茂*

日本材料学会第61期通常総会・学術講演会論文集(USB Flash Drive), 2 Pages, 2012/05

超音波ショットピーニングを施した異材溶接継手の熱負荷前後における表面及び内部の残留応力分布を、X線と中性子回折によって測定した。結果をもとに、熱負荷による残留応力緩和機構を検討した。

論文

Real-time imaging and analysis of differences in cadmium dynamics in rice cultivars ($$it{Oryza sativa}$$) using positron-emitting $$^{107}$$Cd tracer

石川 覚*; 鈴井 伸郎; 伊藤 小百合*; 石井 里美; 井倉 将人*; 安部 匡*; 倉俣 正人*; 河地 有木; 藤巻 秀

BMC Plant Biology, 11, p.172_1 - 172_12, 2011/11

 被引用回数:52 パーセンタイル:11.04(Plant Sciences)

In this study, we have visualized and quantitatively analysed the real-time Cd dynamics from roots to grains in typical rice cultivars that differed in grain Cd concentrations. We used positron-emitting $$^{107}$$Cd tracer and an innovative imaging technique, the positron-emitting tracer imaging system (PETIS). In particular, a new method for direct and real-time visualization of the Cd uptake by the roots in the culture was first realized in this work. Imaging and quantitative analyses revealed the different patterns in time-varying curves of Cd amounts in the roots of rice cultivars tested. Three low-Cd accumulating cultivars (japonica type) showed rapid saturation curves, whereas three high-Cd accumulating cultivars (indica type) were characterized by curves with a peak within 30 min after $$^{107}$$Cd supplementation, and a subsequent steep decrease resulting in maintenance of lower Cd concentrations in their roots. Moreover, the PETIS analyses revealed that the high-Cd accumulating cultivars were characterized by rapid and abundant Cd transfer to the shoots from the roots, a faster transport velocity of Cd to the panicles, and Cd accumulation at high levels in their panicles, passing through the nodal portions of the stems where the highest Cd intensities were observed.

論文

Quantitative evaluation of rice varieties in cadmium uptake activities for remediation of cadmium-contaminated soil

石川 覚*; 鈴井 伸郎; 伊藤 小百合*; 石井 里美; 山崎 治明*; 河地 有木; 石岡 典子; 藤巻 秀

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 102, 2011/01

In this study, we evaluated the activities on Cd translocation of a few candidate varieties and analyzed the biological mechanisms using a positron-emitting tracer imaging system (PETIS). Three common rice cultivars, Nipponbare, Koshihikari and Sasanishiki and three candidate varieties were subjected. We equally fed the hydroponic culture solution including $$^{107}$$Cd to the six test plants and obtained the serial images of the Cd distribution in the aerial parts for 36 h using PETIS. As a result, It was found that the three candidate plants accumulated Cd in their aerial parts approximately two times as common cultivars. It was also found that almost all Cd in the culture solution was absorbed by all the tested plants. Therefore, this result indicates that the difference was due to greater activities of the candidates in the process to export Cd from the root tissue to the aerial parts, but not in the process of absorption from the culture.

論文

An Approach to DNA crystallization using the thermal reversible process of DNA duplexes

茶竹 俊行*; 佐崎 元*; 亀甲 龍彦*; 藤原 悟; 石川 卓哉*; 松本 治*; 森本 幸生*

Crystal Growth & Design, 10(3), p.1090 - 1095, 2010/03

 被引用回数:4 パーセンタイル:48.86(Chemistry, Multidisciplinary)

温度上昇により二本鎖DNAから一本鎖DNAへの転移が起こる熱的可逆過程を用いたDNA結晶化技術を提案した。DNA8量体(dCGCGCG)結晶の溶解度及びその融解点と二本鎖DNAから一本鎖DNAへの転移過程の関係を調べた結果、この転移過程が溶解度上昇を引き起こすことが明らかとなった。この温度による溶解度制御技術を用いることにより、少量のDNAから良質の単結晶が生成できることが示された。簡単に適用可能なこの方法は、高価な装置を用いることなく結晶の溶解度を制御できるという点で、従来の蒸気拡散法より優れている。

論文

地層処分の安全評価の観点からのガラス固化体中の核種インベントリ評価の信頼性向上の取り組み

石川 真澄*; 金子 悟*; 北山 一美*; 石黒 勝彦*; 植田 浩義*; 若杉 圭一郎*; 篠原 伸夫; 奥村 啓介; 茅野 政道; 守屋 登康*

日本原子力学会和文論文誌, 8(4), p.304 - 312, 2009/12

ガラス固化体に関する品質管理では、おもに貯蔵や輸送の観点から重要となる項目が対象とされており、地層処分で対象とする長半減期核種は、これまで研究開発の対象とされてこなかった。ガラス固化体の長半減期核種インベントリ評価では、その信頼性向上に向けて技術開発し、実測データを取得する取り組みが不可欠である。われわれは照射履歴の明らかな使用済燃料の溶解液を用いて、核種の生成・壊変コード及び核データ・ライブラリーの信頼性を向上させるとともに、その適応性を検討する技術開発プログラムを開始した。ガラス固化体の品質管理課題を解決するためには、地層処分の分野ばかりでなく、原子力施設の運転,使用済燃料の再処理及び廃棄物のガラス固化の観点から包括的な研究が必要となる。本研究はこれらを統括する先端的技術開発である。

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