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The Surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

北里 宏平*; Milliken, R. E.*; 岩田 隆浩*; 安部 正真*; 大竹 真紀子*; 松浦 周二*; 荒井 武彦*; 仲内 悠祐*; 中村 智樹*; 松岡 萌*; et al.

Science, 364(6437), p.272 - 275, 2019/04

 被引用回数:140 パーセンタイル:99.81(Multidisciplinary Sciences)



Electrical and crystallographic study of an electrothermodynamic cycle for a waste heat recovery

Kim, J.*; 山中 暁*; 中島 啓*; 加藤 孝典*; Kim, Y.*; 福田 竜生; 吉井 賢資; 西畑 保雄; 馬場 将亮*; 武田 雅敏*; et al.

Advanced Sustainable Systems (Internet), 2(11), p.1800067_1 - 1800067_8, 2018/11

 被引用回数:1 パーセンタイル:11.84(Green & Sustainable Science & Technology)

An innovative electrothermodynamic cycle (pyroelectric effect with an external electric field) was recently presented, which is based on temporal temperature variations in wasted heat from engine exhaust gas. In this paper, for further improvement, a generating mechanism of the cycle is investigated using in-operando time-resolved synchrotron X-ray diffraction with generating assessment. The polarizations of the sample are gained from both crystal/domain changes and simultaneous electrical measurements. Three types of materials are prepared: soft and hard types of lead zirconate titanate (PZT) and lead magnesium niobate-lead titanate (PMN-PT). Among them, PMN-PT has the highest generating power. When an external electric field is applied, the PMN-PT exhibits only 180$$^circ$$ domain rotations, whereas PZTs exhibit both 90$$^circ$$ and 180$$^circ$$ rotations. A strong driving force for 180$$^circ$$ rotation depresses rotations in other angles and increases polarization changes. The results show that the material development, which has only 180$$^circ$$ switching domains, has potential for use in the establishment of a high-efficiency waste heat recovery system.


Temperature stability of PIN-PMN-PT ternary ceramics during pyroelectric power generation

茂呂 拓哉*; Kim, J.*; 山中 暁*; 村山 一郎*; 加藤 孝典*; 中山 忠親*; 武田 雅敏*; 山田 昇*; 西畑 保雄; 福田 竜生; et al.

Journal of Alloys and Compounds, 768, p.22 - 27, 2018/11

 被引用回数:10 パーセンタイル:66.99(Chemistry, Physical)

Relaxor-based ternary Pb(In$$_{1/2}$$Nb$$_{1/2}$$)O$$_3$$-Pb(Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$-PbTiO$$_3$$ (PIN-PMN-PT) ceramics near a morphotropic phase boundary were grown, and their electrical properties at various temperatures were investigated in the electrothermodynamic cycle for the future environment-friendly automotive applications. Structural disordering, depending on the PIN content, influenced the diffuse phase transition between the tetragonal and cubic structures and contributed to the power-generating behavior. The net power-generating energies (P$$_{net}$$) were 2.43-3.01 mW/cm$$^3$$ at temperatures above 200$$^circ$$C and were maintained at above 1 mW/cm$$^3$$ over a temperature range of approximately 100 degrees. Therefore, the PIN-PMN-PT system has a possibility of a wider usage temperature range, the disordering of the perovskite crystal structure can be controlled, and it will be a candidate for the application of pyroelectric energy conversion system.


Pyroelectric power generation with ferroelectrics (1-x)PMN-xPT

Kim, J.*; 山中 暁*; 中島 啓*; 加藤 孝典*; Kim, Y.*; 福田 竜生; 吉井 賢資; 西畑 保雄; 馬場 将亮*; 武田 雅敏*; et al.

Ferroelectrics, 512(1), p.92 - 99, 2017/08

 被引用回数:6 パーセンタイル:41.1(Materials Science, Multidisciplinary)

We have been investigating a novel electrothermodynamic cycle based on temporal temperature variations using the pyroelectric effect to utilize the waste heat as renewable energy. An improved generating performance with relaxer ferroelectric ceramics was achieved using 75Pb(Mg$$_{2/3}$$Nb$$_{1/3}$$)O$$_3$$-25PbTiO$$_3$$ which is well known for the high dielectric and pyroelectric properties. The potential was evaluated by using the hysteresis loops and generating properties are analyzed both in laboratory and engine dynamometer. Results showed 0.48 mW/cm$$^3$$ in engine dynamometer assessment, which is 3 times larger than the previous study using Pb(Zr,Ti)O$$_3$$.


Relationship between the material properties and pyroelectric-generating performance of PZTs

山中 暁*; Kim, J.*; 中島 啓*; 加藤 孝典*; Kim, Y.*; 福田 竜生; 吉井 賢資; 西畑 保雄; 馬場 将亮*; 山田 昇*; et al.

Advanced Sustainable Systems (Internet), 1(3-4), p.1600020_1 - 1600020_6, 2017/04




佐藤 昌之*; 村岡 浩治*; 穂積 弘毅*; 眞田 幸尚; 山田 勉*; 鳥居 建男

日本航空宇宙学会論文集(インターネット), 65(2), p.54 - 63, 2017/02




眞田 幸尚; 山田 勉*; 佐藤 義治; 西澤 幸康; 石橋 聖*; 渡辺 将久; 鳥居 建男

JAEA-Research 2016-011, 52 Pages, 2016/09




Dynamical behavior of human $$alpha$$-synuclein studied by quasielastic neutron scattering

藤原 悟; 荒木 克哉*; 松尾 龍人; 八木 寿梓*; 山田 武*; 柴田 薫; 望月 秀樹*

PLOS ONE (Internet), 11(4), p.e0151447_1 - e0151447_17, 2016/04

 被引用回数:18 パーセンタイル:67.4(Multidisciplinary Sciences)

Filamentous aggregates (amyloid fibrils) of the protein $$alpha$$-synuclein ($$alpha$$-Syn) are related to the pathogenesis of Parkinson's disease. To understand the pathogenesis mechanism of this disease, the mechanism of the amyloid fibril formation of $$alpha$$-Syn must be elucidated. As a first step toward this ultimate goal, dynamical behavior of $$alpha$$-Syn in the monomeric and the fibril states was investigated using quasielastic neutron scattering (QENS). Analysis of the QENS spectra of solution samples of $$alpha$$-Syn shows that diffusive global motions are observed in the monomeric state but largely suppressed in the fibril state. However, the amplitude of the side chain motion is shown to be larger in the fibril state than in the monomeric state. This implies that significant solvent space exists within the fibrils, which is attributed to the $$alpha$$-Syn molecules within the fibrils having a distribution of conformations. The larger amplitude of the side chain motion in the fibril state than in the monomeric state implies that the fibril state is entropically favorable.



眞田 幸尚; 森 愛理; 石崎 梓; 宗像 雅広; 中山 真一; 西澤 幸康; 卜部 嘉; 中西 千佳; 山田 勉; 石田 睦司; et al.

JAEA-Research 2015-006, 81 Pages, 2015/07




Novel electrothermodynamic power generation

Kim, Y.*; Kim, J.*; 山中 暁*; 中島 啓*; 小川 孝*; 芹沢 毅*; 田中 裕久*; 馬場 将亮*; 福田 竜生; 吉井 賢資; et al.

Advanced Energy Materials, 5(13), p.1401942_1 - 1401942_6, 2015/07

 被引用回数:8 パーセンタイル:41.84(Chemistry, Physical)



Mathematical Modeling of Radioactive Contaminants in the Fukushima Environment

北村 哲浩; 操上 広志; 山口 正秋; 小田 好博; 齋藤 龍郎; 加藤 智子; 新里 忠史; 飯島 和毅; 佐藤 治夫; 油井 三和; et al.

Nuclear Science and Engineering, 179(1), p.104 - 118, 2015/01

 被引用回数:8 パーセンタイル:65.81(Nuclear Science & Technology)



超深地層研究所計画 年度報告書(2013年度)

濱 克宏; 見掛 信一郎; 西尾 和久; 川本 康司; 山田 信人; 石橋 正祐紀; 村上 裕晃; 松岡 稔幸; 笹尾 英嗣; 真田 祐幸; et al.

JAEA-Review 2014-038, 137 Pages, 2014/12


日本原子力研究開発機構東濃地科学センターでは、「地層処分技術に関する研究開発」のうち深地層の科学的研究(地層科学研究)の一環として、結晶質岩(花崗岩)を対象とした超深地層研究所計画を進めている。本計画は、「第1段階; 地表からの調査予測研究段階」、「第2段階; 研究坑道の掘削を伴う研究段階」、「第3段階; 研究坑道を利用した研究段階」の3段階からなり、2013年度は、第2段階および第3段階の調査研究を進めた。本報告書は、2010年度に改定した「超深地層研究所地層科学研究基本計画」に基づいた、超深地層研究所計画の第2段階および第3段階の調査研究のうち2013年度に実施した(1)調査研究、(2)施設建設、(3)共同研究等の成果を取りまとめたものである。



眞田 幸尚; 山田 勉; 石橋 聖; 鳥居 建男

第57回自動制御連合講演会講演論文集(USB Flash Drive), p.695 - 698, 2014/11




眞田 幸尚; 西澤 幸康; 卜部 嘉; 山田 勉; 石田 睦司; 佐藤 義治; 平山 弘克; 高村 善英; 西原 克哉; 伊村 光生; et al.

JAEA-Research 2014-012, 110 Pages, 2014/08





眞田 幸尚; 高村 善英; 卜部 嘉; 土田 清文; 西澤 幸康; 山田 勉; 佐藤 義治; 平山 弘克; 西原 克哉; 伊村 光生; et al.

JAEA-Research 2014-005, 67 Pages, 2014/05





眞田 幸尚; 西澤 幸康; 山田 勉; 池田 和隆*; 松井 雅士*; 土田 清文; 佐藤 義治; 平山 弘克; 高村 善英; 西原 克哉; et al.

JAEA-Research 2013-049, 129 Pages, 2014/03





眞田 幸尚; 山田 勉; 平山 弘克; 伊村 光生; 西澤 幸康; 鳥居 建男

第1回計測自動制御学会制御部門マルチシンポジウム報文集(USB Flash Drive), 5 Pages, 2014/03



Evidence for a charge collective mode associated with superconductivity in copper oxides from neutron and X-ray scattering measurements of La$$_{2-x}$$Sr$$_x$$CuO$$_4$$

Park, S. R.*; 福田 竜生; Hamann, A.*; Lamago, D*; Pintschovius, L.*; 藤田 全基*; 山田 和芳*; Reznik, D.*

Physical Review B, 89(2), p.020506_1 - 020506_5, 2014/01

 被引用回数:24 パーセンタイル:69.85(Materials Science, Multidisciplinary)

In superconducting copper oxides, some Cu-O bond-stretching phonons around 70 meV show anomalous giant softening and broadening of electronic origin, and electronic dispersions have large renormalization kinks near the same energy. These observations suggest that phonon broadening originates from quasiparticle excitations across the Fermi surface and the electronic dispersion kinks originate from coupling to anomalous phonons. We measured the phonon anomaly in underdoped ($$x$$ = 0.05) and overdoped ($$x$$ = 0.20 and 0.25) La$$_{2-x}$$Sr$$_x$$CuO$$_4$$ by inelastic neutron and X-ray scattering with high resolution. Combining these and previously published data, we found that doping dependence of the magnitude of the giant phonon anomaly is very different from that of the ARPES kink, i.e., the two phenomena are not connected. We show that these results provide indirect evidence that the phonon anomaly originates from novel collective charge excitations as opposed to interactions with electron-hole pairs. Their amplitude follows the superconducting dome so these charge modes may be important for superconductivity.



田上 雅彦*; 山田 泰広*; 山下 佳彦*; 宮川 歩夢*; 松岡 俊文*; Xue, Z.*; 辻 健*; 鶴田 忠彦; 松岡 稔幸; 天野 健治; et al.

JAEA-Research 2012-036, 110 Pages, 2013/02





鶴田 忠彦; 田上 雅彦; 天野 健治; 松岡 稔幸; 栗原 新; 山田 泰広*; 小池 克明*

地質学雑誌, 119(2), p.59 - 74, 2013/02


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