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論文

Investigating the $$^{13}$$N($$alpha$$,$$p$$)$$^{16}$$O reaction rates via the $$^{19}$$F($$p$$,$$t$$)$$^{17}$$F reaction

Kim, S. H.*; Chae, K. Y.*; 浅井 雅人; 廣瀬 健太郎; 佐藤 哲也; 牧井 宏之; 西尾 勝久; Orlandi, R.; Smallcombe, J.; 洲嵜 ふみ; et al.

Journal of the Korean Physical Society, 89(5), p.488 - 493, 2026/09

 被引用回数:0 パーセンタイル:0.00(Physics, Multidisciplinary)

コア崩壊超新星爆発(CCSNe)の元素合成シミュレーションにおいて、$$^{13}$$N($$alpha$$,$$p$$)$$^{16}$$O反応速度の不確実性が課題となっていた。本研究では、この反応を制約するため、JAEAタンデム加速器で$$^{19}$$F($$p$$,$$t$$)$$^{17}$$F遷移反応実験を実施した。得られたトリトンスペクトルと角度分布から、関連する$$^{17}$$F共鳴の崩壊特性(部分幅)を詳細に測定し、その結果を用いて反応速度パラメータを精密化した。これにより、CCSNe核合成モデルの信頼性向上が期待できる。

論文

Progressive release of long-stored carbon from tropical peatland disturbances

小嵐 淳; 伊藤 雅之*; 安藤 麻里子; 國分 陽子; 松枝 誠; Kusin, K.*; Jaya, A.*; Dohong, S.*; 平野 高司*

Nature Communications (Internet), 17, p.4369_1 - 4369_9, 2026/05

 被引用回数:0 パーセンタイル:0.00(Multidisciplinary Sciences)

熱帯泥炭地は重要かつ長期的な炭素貯蔵庫であるが、人間活動によって劣化が進み、大気への炭素放出が深刻な懸念となっている。本研究は、インドネシア中部カリマンタンの泥炭地における炭素貯留と放出について、泥炭層と地下水溶存有機炭素の放射性炭素年代測定に基づいて明らかにした。18年間(1996年$$sim$$2014年)の排水は、数百年から千年もの間、浸水環境で保存されていた炭素5-11kg C m$$^{-2}$$を放出した。排水に続く火災は、過去3000年間に蓄積された炭素23-32kg C m$$^{-2}$$を放出し、より古い泥炭の分解を誘発した。この知見をインドネシアの撹乱された泥炭地全域に外挿すると、1996年から2014年の間に0.81-3.70Gtの炭素が放出されたことが示唆された。さらに継続的な泥炭の分解によって年間0.03-0.08Gtの炭素が放出され続けており、地球の炭素収支に重大な影響を及ぼしている。

論文

Magnetic evolution, phase transitions, and electronic band structure of the ferrotoroidic candidate Ba$$_6$$Cr$$_2$$S$$_{10}$$

Zhao, G.*; Li, J.*; Zhang, J.*; 小嶋 健児*; Cai, Y.*; 伊藤 孝; Yoon, S. W.*; Wang, X.*; 前川 禎通*; Su, G.*; et al.

Physical Review Research (Internet), 8(1), p.013331_1 - 013331_10, 2026/03

Ferrotoroidic materials, which break both time- and space-reversal symmetries to enhance magnetoelectric responses, are of great interest for applications. Ba$$_6$$Cr$$_2$$S$$_{10}$$, a recently synthesized quasi-one-dimensional ferrotoroidic candidate, combines polarization, magnetization, and toroidal moment, yet its electronic band structure, magnetic evolution, and phase transitions remain incompletely understood to date. Here, we investigate Ba$$_6$$Cr$$_2$$S$$_{10}$$, using electrical transport, direct current magnetization, alternating current susceptibility, specific heat, and muon spin rotation ($$mu$$SR) measurements, along with various first-principles calculations. Electrical transport measurements and density functional theory confirm a narrow band gap ($$sim$$0.707~eV, experimentally; $$sim$$0.680~eV, theoretically). $$mu$$SR measurements reveal that static magnetism dominates down to 2~K, with an ordered volume fraction of $$sim$$89% at this temperature. Two distinct transitions are identified: one around the N$'{e}$el temperature [$$T_{rm N}=(8pm 1)$$~K] and another corresponding to a phase transition near 30~K, as consistently indicated by our complementary experimental techniques. The absence of dynamic critical behaviors and the lack of a $$lambda$$-type specific heat anomaly are consistent with a first-order-like transition at $$T_{rm N}$$. Based on various complementary experimental results and theoretical calculations, we propose a hypothesis that the $$sim$$30~K broad feature arises from the complex interplay between crystal structure distortion and magnetic coupling, which is potentially directly linked to ferrotoroidicity. As the first study integrating $$mu$$SR with complementary experiments and first-principles calculations to explore ferrotoroidicity, this work provides key insights into the underlying physics of Ba$$_6$$Cr$$_2$$S$$_{10}$$ and related compounds in this area.

論文

Stress and temperature, rather than hydrogen, govern stacking fault evolution during tensile deformation in Fe-24Cr-19Ni steel

伊東 達矢; 小川 祐平*; Gong, W.; 川崎 卓郎; 柴田 曉伸*; Harjo, S.

Scripta Materialia, 273, p.117084_1 - 117084_6, 2026/03

 被引用回数:5 パーセンタイル:69.61(Nanoscience & Nanotechnology)

The effect of solute hydrogen on stacking fault evolution in austenitic steels remains debated. In this study, the changes in stacking fault probability in the $$<$$111$$>$$//loading direction grains family ($$P_{mathrm{SF}}^{111}$$) of hydrogen-charged and non-charged Fe-24Cr-19Ni austenitic steels were evaluated using ${it in situ}$ neutron diffraction during tensile deformation at 223 and 177 K. When $$P_{mathrm{SF}}^{111}$$ values were plotted against macroscopic strain, hydrogen apparently enhanced stacking fault evolution. However, when identical data were translated into the form of $$P_{mathrm{SF}}^{111}$$ versus stress, the superficial hydrogen-effect on $$P_{mathrm{SF}}^{111}$$ notably disappeared. Rather, deformation temperature played more predominant role - lower temperature led to higher $$P_{mathrm{SF}}^{111}$$ regardless of hydrogen-charging, reflecting the reduction of stacking fault energy with decreasing temperature. These findings demonstrate that hydrogen has a minor effect on stacking fault evolution compared with temperature and applied stress.

論文

Elastic accommodation and anomalous tetragonality of thin-plate martensite in an Fe-31Ni-10Co-3Ti alloy revealed by ${it in situ}$ neutron diffraction at cryogenic temperatures

山下 享介*; Harjo, S.; Gong, W.; 川崎 卓郎; 森戸 茂一*; 諸岡 聡; 藤井 英俊*; 友田 陽*

Journal of Alloys and Compounds, 1056, p.186668_1 - 186668_11, 2026/02

 被引用回数:0 パーセンタイル:0.00(Chemistry, Physical)

In this study, ${it in situ}$ neutron diffraction during cryogenic cooling was performed on Fe-31Ni-10Co-3Ti alloy to investigate changes in the austenite lattice constant and martensite tetragonality during thin-plate martensitic transformation. The austenite lattice constant showed only a slight change because of the Invar effect, but decreased below the Ms temperature due to elastic accommodation of transformation strain. Broadening of austenite diffraction peaks and EBSD analysis indicated localized plastic accommodation near intersecting martensite regions. For martensite, the a-axis decreased while the c-axis increased anomalously with decreasing temperature, leading to enhanced tetragonality below 35 K. During heating, the c-axis decreased and tetragonality was reduced. These behaviors are attributed to Bain strain during twin formation and possible interfacial stress with surrounding austenite.

論文

New insights into the Oklo natural fission reactors elucidated from isotopic studies using state-of-the-art analytical techniques

日高 洋*; 鏡味 沙耶; 齊藤 天晴; 横山 立憲; Pravdivtseva, O.*; Meshik, A.*; Bentridi, S.*; Durastanti Rabnga Mombo, E. D.*; Gall, B.*

Radiation Protection Dosimetry, 202(2), p.65 - 69, 2026/02

 被引用回数:0 パーセンタイル:0.00(Environmental Sciences)

オクロ天然原子炉試料の同位体データは、個々の原子炉領域で生じた核反応の履歴を読み解くための重要な情報だが、そのほとんどは四半世紀以上前に取得されたものである。同位体分析に使用する質量分析装置の技術的進歩は目覚ましく、最新の技術によって従来よりも高精度な同位体データを取得することで、オクロ現象の解明に繋がる新たな知見を得ることが期待できる。本論文では、現在我々が実施している、先端的同位体分析技術に基づくオクロ現象に対する新しいアプローチについて論ずる。

論文

Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion

Cho, K.*; 山下 葵平*; 角谷 心之輔*; 齊藤 拓馬*; 佐々木 泰祐*; 澤泉 克彦*; 奥川 将行*; 小泉 雄一郎*; 眞山 剛*; 菊川 泰地*; et al.

Acta Materialia, 303, p.121696_1 - 121696_18, 2026/01

 被引用回数:21 パーセンタイル:95.69(Materials Science, Multidisciplinary)

The deformation behavior and strengthening mechanism of Inconel 718 with a hierarchical structure composed of microscale crystallographic lamellar microstructure (CLM) and nanoscale cellular structure, fabricated by laser powder bed fusion, were clarified via nanoscale microstructural and in-situ neutron diffraction analyses. The CLM is a layered structure parallel to the building direction (BD) and consists of relatively wide main and narrow sub-layers with $$<$$110$$>$$ and $$<$$100$$>$$ orientations, respectively, with respect to BD. This is the first study to demonstrate that the yield stress of the alloys depends strongly on deformation stresses of the sub-layers, even though Schmid factors of the primary slip system for both layers are the same. The sub-layer continues to deform elastically even beyond the micro-yield point of the main layer, which results in the macroscopic strengthening at an early stage of deformation. On the other hand, the cellular structure is formed in both layers, associated with a dendritic cell growth along $$<$$100$$>$$ direction, Nb segregation between the cells and an accumulation of dislocations to decrease a residual stress. The cell boundaries with numerous dislocations and Nb segregation act as a strong barrier to dislocation motion resulting in a stress increase through the Hall-Petch law, even though they are low-angle grain boundaries. The spacing and morphology of the cell boundary depend strongly on fabrication conditions. The optimized cellular structure provides significant strengthening comparable to or greater than that caused by large-angle grain boundaries, thereby increasing the macroscopic strength of the alloys through hardening of the sub-layer.

論文

Integrated neutron and surface-based characterization of stress/strain fields and microstructural evolution during fatigue crack growth in SUS304 stainless steel

Su, Y. H.; 篠原 武尚; Parker, J. D.*; 及川 健一; 甲斐 哲也; Gong, W.; 伊東 達矢; Harjo, S.; 相澤 一也; 鬼柳 善明*; et al.

Materials Science & Engineering A, 951, p.149607_1 - 149607_16, 2026/01

 被引用回数:0 パーセンタイル:0.00(Nanoscience & Nanotechnology)

Local variations in residual stress/strain and microstructure during fatigue crack growth in compact tension specimens of SUS304 austenitic stainless steel were investigated using complementary methods: pulsed neutron Bragg-edge imaging (NBEI), neutron diffraction (ND), digital image correlation (DIC) and electron backscatter diffraction (EBSD). Surface strain fields were evaluated using DIC and EBSD. NBEI provided two-dimensional averaged microstructure information, whereas ND yielded detailed three-dimensional distributions of residual lattice (elastic) strain and stress. This study particularly focused on how NBEI is helpful in understanding overall damage characteristics in the vicinity of a crack tip two-dimensionally. Distribution of microstructural parameters associated with crack growth, such as lattice constant, crystallite size, and texture, across the entire specimen was considered using Bragg-edge spectral analysis. The plastic zone in front of the crack tip, characterized by reduced crystallite size, was observed during crack propagation. After final fracture, two distinct zones with reduced crystallite size were identified: one caused by localized plastic deformation near the crack tip, and the other by bending at the back end of the specimen. This paper introduces the four experimental techniques and describes their respective features. Each method has its own advantages and limitations; However, by integrating their results, a more comprehensive understanding of the overall stress/strain field can be achieved.

論文

Cryogenic tensile testing system for simultaneous ${it in situ}$ neutron diffraction and digital image correlation strain analysis

川崎 卓郎; Harjo, S.; Gong, W.; Mao, W.*; 山下 享介*; 伊東 達矢; 相澤 一也

Review of Scientific Instruments, 96(9), p.093901_1 - 093901_6, 2025/09

 被引用回数:6 パーセンタイル:78.81(Instruments & Instrumentation)

A cryogenic tensile testing system for ${it in situ}$ neutron diffraction measurement, incorporating macroscopic strain distribution measurement through the Digital Image Correlation (DIC) method, was developed. By integrating this system with a versatile horizontal load frame, tensile tests can be conducted within the temperature range from room temperature to 20 K. A tentative measurement combining ${it in situ}$ neutron diffraction and the DIC technique was performed on an ultrafine-grained 304 stainless steel during tensile deformation at 77 K. It revealed that the deformation-induced martensitic transformation can be characterized more accurately by considering the local macroscopic strain in the neutron-irradiated gauge region, as determined by the DIC method, rather than the overall sample strain. The developed system enables accurate measurement of macroscopic strain, particularly in cases of non-uniform deformation, while simultaneously capturing associated crystallographic structure changes, thereby enhancing the effectiveness of neutron data for materials research.

論文

その場中性子回折を用いたSUS310Sステンレス鋼の水素添加による強さ・伸び向上メカニズムの解明

伊東 達矢; 小川 祐平*; Gong, W.; Mao, W.*; 川崎 卓郎; 岡田 和歩*; 柴田 曉伸*; Harjo, S.

波紋, 35(3), p.129 - 133, 2025/08

Recent studies have shown that the addition of hydrogen to SUS310S stainless steel (Fe-24Cr-19Ni, mass%) simultaneously enhances both strength and ductility, indicating a phenomenon contrary to the conventional understanding of hydrogen embrittlement. In this study, we investigated the underlying mechanism through ${it in situ}$ neutron diffraction experiments during tensile deformation using TAKUMI at the MLF of J-PARC. The results revealed that solid-solution strengthening by hydrogen plays the most significant role in improving the mechanical properties. Solute hydrogen atoms distort the lattice to suppress dislocation motion, thereby increasing the strength. The raised stress in the hydrogen charged sample enables the onset of deformation twinning at a smaller strain compared to the non-hydrogen charged sample. Consequently, the twinning-induced plasticity effect contributes more significantly to work hardening and the improvement of uniform elongation due to the solid-solution strengthening by hydrogen. These findings suggest a new pathway for the effective utilization of hydrogen in austenitic steels.

論文

Unique deformation behavior of ultrafine-grained 304 stainless steel at 20 K

Mao, W.*; Gong, W.; 川崎 卓郎; Gao, S.*; 伊東 達矢; 山下 享介*; Harjo, S.; Zhao, L.*; Wang, Q.*

Scripta Materialia, 264, p.116726_1 - 116726_6, 2025/07

 被引用回数:6 パーセンタイル:51.04(Nanoscience & Nanotechnology)

An ultrafine-grained 304 austenitic stainless steel exhibited pronounced serrated Luders deformation at 20 K, with stress and temperature oscillations reaching 200 MPa and 20 K. ${it In-situ}$ neutron diffraction and digital image correlation revealed discontinuous Luders band propagation and burst martensite formation. During deformation, austenite phase stress remained lower than at upper yielding, indicating elastic behavior. Notably, martensite phase stress stayed lower than austenite until fracture, likely due to stress relaxation from burst martensitic transformation at 20 K. The low martensite stress delayed brittle fracture until austenite plastically yielded during uniform deformation.

論文

Magnetism of kagome metals (Fe$$_{1-x}$$Co$$_x$$)Sn studied by $$mu$$SR

Cai, Y.*; Yoon, S.*; Sheng, Q.*; Zhao, G.*; Seewald, E. F.*; Ghosh, S.*; Ingham, J.*; Pasupathy, A. N.*; Queiroz, R.*; Lei, H.*; et al.

Physical Review B, 111(21), p.214412_1 - 214412_17, 2025/06

 被引用回数:3 パーセンタイル:40.34(Materials Science, Multidisciplinary)

We study the magnetic properties of the metallic kagome system (Fe$$_{1-x}$$Co$$_x$$)Sn by a combination of muon spin relaxation ($$mu$$SR), magnetic susceptibility, and scanning tunneling microscopy (STM) measurements in single crystal specimens with Co concentrations $$x$$ = 0, 0.11, 0.8. In the undoped antiferromagnetic compound FeSn, we find possible signatures for a previously unidentified phase that sets in at $$T^{*}sim 50$$~K, well beneath the Neel temperature $$T_{N}sim 376$$~K as indicated by a peak in the relaxation rate 1/$$T_1$$ observed in zero field (ZF) and longitudinal field (LF) $$mu$$SR measurements, with a corresponding anomaly in the ac and dc susceptibility, and an increase in the static width 1/$$T_2$$ in ZF-$$mu$$SR measurements. No signatures of spatial symmetry breaking are found in STM down to 7~K. Related to the location and motion of muons in FeSn, we confirmed a previous report that about 40% of the implanted muons reside at a field-cancelling high symmetry site at $$T < 250$$~K, while an onset of thermal hopping changes the site occupancy at higher temperatures. In Fe$$_{0.89}$$Co$$_{0.11}$$Sn, where disorder eliminated the field-cancellation effect, all the implanted muons exhibit precession and/or relaxation in the ordered state. In Fe$$_{0.2}$$Co$$_{0.8}$$Sn, we find canonical spin glass behavior with freezing temperature $$T_gsim 3.5$$~K; the ZF and LF-$$mu$$SR time spectra exhibit results similar to those observed in dilute alloy spin glasses CuMn and AuFe, with a critical behavior of $$1/T_1$$ at $$T_g$$ and $$1/T_1to 0$$ as $$Tto 0$$. The absence of spin dynamics at low temperatures makes a clear contrast to the spin dynamics observed by $$mu$$SR in many geometrically frustrated spin systems on insulating kagome, pyrochlore, and triangular lattices. The spin glass behavior of CoSn doped with dilute Fe moments is shown to originate primarily from the randomness of doped Fe moments rather than due to geometrical frustration of the underlying lattice.

論文

Martensitic transformation and shape memory effect in Mn-rich Cu-Mn-Al alloys

伊東 達矢; Xu, S.*; Xu, X.*; 大森 俊洋*; 貝沼 亮介*

Shape Memory and Superelasticity, 11(2), p.167 - 175, 2025/06

The microstructure, crystal structures, cold workability, and martensitic transformation temperatures of several Cu$$_{100-{it x}-{it y}}$$Mn$$_{it x}$$Al$$_{it y}$$ (40 $$leq$$ ${it x}$ $$leq$$ 55; 10 $$leq$$ ${it y}$ $$leq$$ 13; at%) alloys were analyzed. For the first time, martensitic transformation was revealed Mn-rich Cu-Mn-Al alloys. The surface relief of the martensite phase reversibly appeared and disappeared during cooling and heating, along with small thermal hysteresis, implying a thermoelastic transformation. The crystal structures of the parent and martensite phases are B2 and 2M(BCT), respectively, with c$/a being approximately 1.35. Cold workability improves with decreasing Al content, exhibiting a trend similar to that observed for previously reported Cu-rich Cu-Al-Mn shape memory alloys. The martensitic transformation temperatures decrease with increasing Al content and increase with increasing Mn content. These results are consistent with the stability trends of the parent body-centered cubic phase in the phase diagram at high temperature. The shape memory effect with a recovery strain of 1.3% was observed in a 5.0% pre-stretched Cu$_{39}$$Mn$$_{50}$$Al$$_{11}$$ (at%) sample. This alloy demonstrates moderate cold workability and cost-effectiveness, exhibiting potential as an alternative for conventional shape memory alloys in various applications.

論文

Role of solute hydrogen on mechanical property enhancement in Fe-24Cr-19Ni austenitic steel; An ${it in situ}$ neutron diffraction study

伊東 達矢; 小川 祐平*; Gong, W.; Mao, W.*; 川崎 卓郎; 岡田 和歩*; 柴田 曉伸*; Harjo, S.

Acta Materialia, 287, p.120767_1 - 120767_16, 2025/04

 被引用回数:29 パーセンタイル:98.55(Materials Science, Multidisciplinary)

Incorporating solute hydrogen into Fe-Cr-Ni-based austenitic stainless steels enhances both strength and ductility, providing a promising solution to hydrogen embrittlement by causing solid-solution strengthening and assisting deformation twinning. However, its impacts on the relevant lattice defects evolution (${it i.e.}$, dislocations, stacking faults, and twins) during deformation remains unclear. This study compared the tensile deformation behavior in an Fe-24Cr-19Ni (mass%) austenitic steel with 7600 atom ppm hydrogen-charged (H-charged) and without hydrogen-charged (non-charged) using ${it in situ}$ neutron diffraction. Hydrogen effects on the lattice expansion, solid-solution strengthening, stacking fault probability, stacking fault energy, dislocation density, and strain/stress for twin evolution were quantitatively evaluated to link them with the macroscale mechanical properties. The H-charged sample showed improvements in yield stress, flow stress, and uniform elongation, consistent with earlier findings. However, solute hydrogen exhibited minimal influences on the evolution of dislocation and stacking fault. This fact contradicts the previous reports on hydrogen-enhanced dislocation and stacking fault evolutions, the latter of which can be responsible for the enhancement of twinning. The strain for twin evolution was smaller in the H-charged sample compared to the non-charged one. Nevertheless, when evaluated as the onset stress for twin evolution, there was minimal change between the two samples. These findings suggest that the increase in flow stress due to the solid-solution strengthening by hydrogen is a root cause of accelerated deformation twinning at a smaller strain, leading to an enhanced work-hardening rate and improved uniform elongation.

論文

${it In situ}$ neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steel

伊東 達矢; 小川 祐平*; Gong, W.; Mao, W.*; 川崎 卓郎; 岡田 和歩*; 柴田 曉伸*; Harjo, S.

Proceedings of the 7th International Symposium on Steel Science (ISSS 2024), p.237 - 240, 2024/11

Hydrogen embrittlement has long been an obstacle to the development of safe infrastructure. However, in contrast to hydrogen's embrittling effect, recent research has revealed that the addition of hydrogen improves both the strength and uniform elongation of AISI Type 310S austenitic stainless steel. A detailed understanding of how hydrogen affects the deformation mechanism of this steel could pave the way for the development of more advanced materials with superior properties. In the present study, ${it in situ}$ neutron diffraction experiments were conducted on Type 310S steel with and without hydrogen-charged to investigate the effect of hydrogen on the deformation mechanism. In addition to the effect of solid-solution strengthening by hydrogen, the q-value, a parameter representing the proportion of edge and screw dislocations in the accumulated dislocations, was quantitatively evaluated using CMWP analysis on neutron diffraction patterns. The comparison of q-values between the hydrogen-charged and non-charged samples reveals that hydrogen has minimal effect on dislocation character in Type 310S steel.

論文

Martensitic transformation-governed Luders deformation enables large ductility and late-stage strain hardening in ultrafine-grained austenitic stainless steel at low temperatures

Mao, W.*; Gao, S.*; Gong, W.; 川崎 卓郎; 伊東 達矢; Harjo, S.; 辻 伸泰*

Acta Materialia, 278, p.120233_1 - 120233_13, 2024/10

 被引用回数:67 パーセンタイル:99.33(Materials Science, Multidisciplinary)

Using a hybrid method of in situ neutron diffraction and digital image correlation, we found that ultrafine-grained 304 stainless steel exhibits Luders deformation after yielding, in which the deformation behavior changes from a cooperation mechanism involving dislocation slip and martensitic transformation to one primarily governed by martensitic transformation, as the temperature decreases from 295 K to 77 K. Such martensitic transformation-governed Luders deformation delays the activation of plastic deformation in both the austenite parent and martensite product, resulting in delayed strain hardening. This preserves the strain-hardening capability for the later stage of deformation, thereby maintaining a remarkable elongation of 29% while achieving a high tensile strength of 1.87 GPa at 77 K.

論文

Polyelectrolyte-protein synergism; pH-responsive polyelectrolyte/insulin complexes as versatile carriers for targeted protein and drug delivery

Murmiliuk, A.*; 岩瀬 裕希*; Kang, J.-J.*; Mohanakumar, S.*; Appavou, M.-S.*; Wood, K.*; Alm$'a$sy, L.*; Len, A.*; Schw$"a$rzer, K.*; Allgaier, J.*; et al.

Journal of Colloid and Interface Science, 665, p.801 - 813, 2024/07

 被引用回数:14 パーセンタイル:67.76(Chemistry, Physical)

タンパク質の構造は複雑であるため、形成されたナノ粒子の特性を予測・調整する能力は限られている。我々の研究の目標は、タンパク質とイオン性薬物とのブロック共重合体によって形成される複合体を系統的に研究することにより、タンパク質/PE複合体における形態転移の主要な引き金を解明し、カプセル化効果を評価し、粒子の安定性を評価することである。我々は、PEと中性親水性ブロックからなる共重合体が、タンパク質の等電点に近いpH値でインスリンと共集合することを示した。粒子内のインスリンの配置は、タンパク質分子間の静電気力によって制御され、形成された粒子の形態は、pHとイオン強度を変化させることによって調整することができる。

論文

Hydrogen bond symmetrisation in D$$_2$$O ice observed by neutron diffraction

小松 一生*; 服部 高典; Klotz, S.*; 町田 真一*; 山下 恵史朗*; 伊藤 颯*; 小林 大輝*; 入舩 徹男*; 新名 亨*; 佐野 亜沙美; et al.

Nature Communications (Internet), 15, p.5100_1 - 5100_7, 2024/06

 被引用回数:29 パーセンタイル:85.81(Multidisciplinary Sciences)

水素結合の対称化とは、水素原子が水素結合の中心に位置する現象である。理論的研究により、氷VIIの水素結合は、圧力が増加するにつれて、水素の分布を変化させながら、いくつかの中間状態を経て、最終的に対称化すると予測されている。これまで、多くの実験的研究が行われてきたにもかかわらず、その水素の位置や転移圧力は一貫していない。われわれは、100GPa以上の圧力で中性子回折実験を行い、氷中の水素分布を決定し、隣接酸素間での分布が80GPa付近で2つから1つになり水素結合が対称化することを世界で初めて観測した。

論文

A Systematic approach for the adequacy analysis of a set of experimental databases; Application in the framework of the ATRIUM activity

Baccou, J.*; Glantz, T.*; Ghione, A.*; Sargentini, L.*; Fillion, P.*; Damblin, G.*; Sueur, R.*; Iooss, B.*; Fang, J.*; Liu, J.*; et al.

Nuclear Engineering and Design, 421, p.113035_1 - 113035_16, 2024/05

 被引用回数:12 パーセンタイル:92.85(Nuclear Science & Technology)

In the Best-Estimate Plus Uncertainty (BEPU) framework, the use of best-estimate code requires to go through a Verification, Validation and Uncertainty Quantification process (VVUQ). The relevance of the experimental data in relation to the physical phenomena of interest in the VVUQ process is crucial. Adequacy analysis of selected experimental databases addresses this problem. The outcomes of the analysis can be used to select a subset of relevant experimental data, to encourage designing new experiments or to drop some experiments from a database because of their substantial lack of adequacy. The development of a specific transparent and reproducible approach to analyze the relevance of experimental data for VVUQ still remains open and is the topic of this contribution. In this paper, the concept of adequacy initially introduced in the OECD/NEA SAPIUM (Systematic APproach for model Input Uncertainty quantification Methodology) activity is formalized. It is defined through two key properties, called representativeness and completeness, that allows considering the multifactorial dimension of the adequacy problem. A new systematic approach is then proposed to analyze the adequacy of a set of experimental databases. It relies on the introduction of two sets of criteria to characterize representativeness and completeness and on the use of multi-criteria decision analysis method to perform the analysis. Finally, the approach is applied in the framework of the new OECD/NEA ATRIUM activity which includes a set of practical IUQ exercises in thermal-hydraulics to test the SAPIUM guideline in determining input uncertainties and forward propagating them on an application case. It allows evaluating the adequacy of eight experimental databases coming from the Super Moby-dick, Sozzi-Sutherland and Marviken experiments and identifying the most adequate ones.

論文

Spectroscopy of neutron-rich Fe isotopes populated in the $$^{70}$$Zn+$$^{238}$$U reaction

Benito, J.*; Lenzi, S. M.*; Recchia, F.*; Axiotis, M.*; Aydin, S.*; Bazzacco, D.*; Benzoni, G.*; Orlandi, R.; 他37名*

Acta Physica Polonica B; Proceedings Supplement, 17(3), p.3-A4_1 - 3-A4_7, 2024/04

 被引用回数:0 パーセンタイル:0.00(Physics, Multidisciplinary)

Excited states of neutron-rich $$^{64,66,68}$$Fe isotopes have been studied through a multinucleon transfer reaction of a $$^{70}$$Zn beam on a $$^{238}$$U target at the National Laboratories of Legnaro, Italy. The magnetic spectrometer PRISMA was used to identified the isotopes produced in the reaction, and the CLARA array of Clover Ge detectors to detect their gamma rays. The obtained level scheme were compared with new, state-of-the-art large scale shell model calculations. The large model space used in the calculation, which included the 2d$$_{5/2}$$ orbital, revealed that this orbit is key in order to obtain excellent agreement between the calculations and the experimental data.

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