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論文

Phase and contrast moir signatures in two-dimensional cone beam interferometry

Sarenac, D.*; Gorbet G.*; Clark, C. W.*; Cory, D. G.*; Ekinci, H.*; Henderson, M. E.*; Huber, M. G.*; Hussey, D. S.*; Kapahi, C.*; Kienzle, P. A.*; et al.

Physical Review Research (Internet), 6(3), p.L032054_1 - L032054_8, 2024/09

https://doi.org/10.1103/PhysRevResearch.6.L032054

Neutron interferometry has played a distinctive role in fundamental science and characterization of materials. Moir neutron interferometers are candidate next-generation instruments: they offer microscopy-like magnification of the signal, enabling direct camera recording of interference patterns across the full neutron wavelength spectrum. Here we demonstrate the extension of phase-grating moir interferometry to two-dimensional geometries. Our measurements of phase topologies and gravitationally induced phase shifts are in good agreement with theory.

論文

Composition dependence of bulk properties in the Co-intercalated transition metal dichalcogenide Co $_{1/3}$ TaS $_{2}$

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; Avdeev, M.*; 飯田一樹*; 梶本亮一; Park, J.-G.*

Physical Review B, 109(6), p.L060403_1 - L060403_7, 2024/02

https://doi.org/10.1103/PhysRevB.109.L060403

被引用回数：3 パーセンタイル：61.83(Materials Science, Multidisciplinary)

Spontaneous Hall conductivity has recently been reported in the triangular lattice antiferromagnet Co $_{1/3}$ TaS $_{2}$ under a zero magnetic field. This phenomenon originates from the distinctive noncoplanar triple- magnetic ground state, possessing uniform real-space Berry curvature characterized by scalar spin chirality. We investigated the physical properties of Co $_{1/3}$ TaS $_{2}$ by judiciously controlling the composition, revealing a drastic change in its bulk properties, even by slight variations in cobalt composition, despite the same crystal structure. For , Co $_{x}$ TaS $_{2}$ keeps all the characteristics of the ground state consistent with the previous studies --- two antiferromagnetic phase transitions at $T_mathrm{N1}$ and $T_mathrm{N2}$ ( $< T_mathrm{N1}$ ), a large spontaneous Hall conductivity [ $sigma_{xy}(mathbf{H} = 0)$ ], and a weak ferromagnetic moment along the axis. However, samples with exhibit distinct bulk properties, including the absence of both $sigma_{xy}(mathbf{H} = 0)$ and the weak ferromagnetic moment. Our neutron diffraction data reveal that Co $_{x}$ TaS $_{2}$ with develops coplanar helical magnetic order with $mathbf{q}_mathrm{m1} =(1/3, 0, 0)$ . This is entirely different from what has been seen in , explaining the observed composition dependence.

論文

Impact of interatomic structural characteristics of aluminosilicate hydrate on the mechanical properties of metakaolin-based geopolymer

Kim, G.*; Cho, S.-M.*; Im, S.*; Suh, H.*; 諸岡聡; 菖蒲敬久; 兼松学*; 町田晃彦*; Bae, S.*

Construction and Building Materials, 411, p.134529_1 - 134529_18, 2024/01

https://doi.org/10.1016/j.conbuildmat.2023.134529

被引用回数：3 パーセンタイル：54.99(Construction & Building Technology)

This study explores the influence of the interatomic structure of sodium aluminosilicate hydrate (N-A-S-H) with varying silica contents on the mechanical properties of metakaolin-based geopolymer. Geopolymer pastes comprising Si/Al ratios between 2.0 and 3.0 were synthesized. A larger number of Si-O-Si linkages compared to Si-O-Al linkages and a higher atomic number density were found in the geopolymers with higher silica contents, which enhanced the compressive strength of the geopolymer pastes up to the optimal Si/Al ratio of 2.5. The paste with a Si/Al = 2.5 exhibited a greater portion of Q $^{4}$ (1Al and 2Al) and denser morphology compared to the other geopolymer pastes. Furthermore, in-situ high-energy synchrotron X-ray scattering experiments were conducted to assess the elastic modulus of the aluminosilicate structure at a local atomic scale. The modulus value in real space decreases with increasing silica contents up to Si/Al = 2.5 and increases with the presence of excessive unreacted silica fume. The modulus value in reciprocal space for the axial and lateral directions both presented a positive value at the geopolymer comprising a Si/Al ratio higher than 2.5, indicating that the load-bearing property of N-A-S-H changed at higher Si/Al ratios. Moreover, the smallest difference between the strains along the axial and lateral directions was detected for the geopolymer with Si/Al = 2.5 in both the real and reciprocal space, owing to the most interconnected and flexible nanostructure, which led to the highest mechanical strength.

論文

Characteristic microstructural phase evolution and the compressive strength development mechanisms of tricalcium silicate pastes under various initial carbonation curing environments

Cho, S.*; Suh, H.*; Im, S.*; Kim, G.*; 兼松学*; 諸岡聡; 町田晃彦*; 菖蒲敬久; Bae, S.*

Construction and Building Materials, 409, p.133866_1 - 133866_20, 2023/12

https://doi.org/10.1016/j.conbuildmat.2023.133866

被引用回数：6 パーセンタイル：79.26(Construction & Building Technology)

The effects of various initial carbonation curing environments on the phase evolution and resulting mechanical characteristics of tricalcium silicate paste were studied. For the analyses of the reaction products and microstructure, synchrotron X-ray diffraction, thermogravimetry, Fourier transform-infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy and high-resolution X-ray computed tomography were utilized. C $_{3}$ S cured under carbonation environment pressurized by 0.1 MPa showed excellent mechanical properties owing to the highest degree of reaction and homogeneous generation of CaCO $_{3}$ with low-Ca/Si calcium silicate hydrates, resulting in a dense matrix with refined pore structure. C $_{3}$ S paste treated under other carbonation conditions underwent deteriorative microstructural phase transitions, including void evolution by decalcification of C-S-H and an inhomogeneous composition of crystalline phases, resulting in inferior properties.

論文

Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co $_{1/3}$ TaS $_{2}$

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; Kang, Y.-G.*; Avdeev, M.*; Sibille, R.*; 飯田一樹*; 梶本亮一; Lee, K. H.*; et al.

Nature Communications (Internet), 14, p.8346_1 - 8346_9, 2023/12

https://doi.org/10.1038/s41467-023-43853-4

被引用回数：10 パーセンタイル：79.98(Multidisciplinary Sciences)

The triangular lattice antiferromagnet (TLAF) has been the standard paradigm of frustrated magnetism for several decades. The most common magnetic ordering in insulating TLAFs is the 120 $^{circ}$ structure. However, a new triple- chiral ordering can emerge in metallic TLAFs, representing the short wavelength limit of magnetic skyrmion crystals. We report the metallic TLAF Co $_{1/3}$ TaS $_{2}$ as the first example of tetrahedral triple- magnetic ordering with the associated topological Hall effect (non-zero $sigma_{xy}(mathbf{H}=0)$ ). We also present a theoretical framework that describes the emergence of this magnetic ground state, which is further supported by the electronic structure measured by angle-resolved photoemission spectroscopy. Additionally, our measurements of the inelastic neutron scattering cross section are consistent with the calculated dynamical structure factor of the tetrahedral triple- state.

論文

First observation of $^{28}$ O

近藤洋介*; Achouri, N. L.*; Al Falou, H.*; Atar, L.*; Aumann, T.*; 馬場秀忠*; Boretzky, K.*; Caesar, C.*; Calvet, D.*; Chae, H.*; et al.

Nature, 620(7976), p.965 - 970, 2023/08

https://doi.org/10.1038/s41586-023-06352-6

被引用回数：18 パーセンタイル：95.53(Multidisciplinary Sciences)

非常に中性子が過剰な原子核 $^{28}$ Oは、陽子、中性子ともに魔法数であることから古くからその性質に興味が持たれていたが、酸素の最後の束縛核 $^{24}$ Oよりも中性子が4個も多いため、これまで観測されてこなかった。この論文では、理化学研究所RIBFにて $^{29}$ Fからの1陽子ノックアウト反応によって $^{28}$ Oを生成し、そこから放出される中性子を測定することによって初めてその観測に成功した。核構造の観点からは、 $^{28}$ Oでは二重閉殻が保たれているか興味が持たれていたが、実験で得られた分光学的因子が殻模型計算で予言されて程度の大きいことから、閉殻構造をもたない可能性が高いことがわかった。

論文

Level structures of $^{56,58}$ Ca cast doubt on a doubly magic $^{60}$ Ca

Chen, S.*; Browne, F.*; Doornenbal, P.*; Lee, J.*; Obertelli, A.*; 角田佑介*; 大塚孝治*; 茶園亮樹*; Hagen, G.*; Holt, J. D.*; et al.

Physics Letters B, 843, p.138025_1 - 138025_7, 2023/08

https://doi.org/10.1016/j.physletb.2023.138025

被引用回数：6 パーセンタイル：87.68(Astronomy & Astrophysics)

$^{57,59}$ Scからの1陽子ノックアウト反応を用いて、 $^{56}$ Caと $^{58}$ Caのガンマ崩壊を観測した。 $^{56}$ Caでは1456(12)keVの線遷移が、 $^{58}$ Caでは1115(34)keVの遷移が観測された。どちらの遷移も暫定的に $2^{+}_{1} rightarrow 0^{+}_{gs}$ と割り当てられた。有効核子間相互作用をわずかに修正した広い模型空間での殻模型計算では、 $2^{+}_{1}$ 準位エネルギー、2中性子分離エネルギー、反応断面積が実験とよく一致し、N=34閉殻の上に新しい殻が形成されていることを裏付けた。その構成要素である $0_{f5/2}$ と $0_{g9/2}$ 軌道はほぼ縮退しており、これは $^{60}$ Caが二重魔法核である可能性を排除し、Ca同位体のドリップラインを $^{70}$ Caあるいはそれ以上にまで広げる可能性がある。

論文

Nuclear structure in parity doublet model

Mun, M.-H.*; Shin, I. J.*; Paeng, W.-G.*; 原田正康*; Kim, Y.*

European Physical Journal A, 59(7), p.149_1 - 149_6, 2023/07

https://doi.org/10.1140/epja/s10050-023-01064-x

被引用回数：2 パーセンタイル：40.52(Physics, Nuclear)

Using an extended parity doublet model with the hidden local symmetry, we study some properties of nuclei in the mean field approximation to see if the parity doublet model could reproduce nuclear properties and also to estimate the value of the chiral invariant nucleon mass $_{0}$ preferred by nuclear structure. We first determine our model parameters using the inputs from free space and from nuclear matter properties. Then, we study some basic nuclear properties such as the nuclear binding energy with several different choices of the chiral invariant mass. We observe that our results approach the experimental values as $_{0}$ is increased until $_{0}$ = 700 MeV and start to deviate more from the experiments afterwards with m0 larger than $_{0}$ = 700 MeV. From this observation, we conclude that $_{0}$ = 700 MeV is preferred by nuclear properties. We then calculate some properties of several selected nuclei with $_{0}$ = 700 MeV and compare them with experiments. Finally, we study the neutron-proton mass difference in some nuclei.

論文

Si-addition contributes to overcoming the strength-ductility trade-off in high-entropy alloys

Wei, D.*; Gong, W.; 都留智仁; Lobzenko, I.; Li, X.*; Harjo, S.; 川崎卓郎; Do, H.-S.*; Bae, J. W.*; Wagner, C.*; et al.

International Journal of Plasticity, 159, p.103443_1 - 103443_18, 2022/12

https://doi.org/10.1016/j.ijplas.2022.103443

被引用回数：67 パーセンタイル：99.58(Engineering, Mechanical)

Face-centered cubic single-phase high-entropy alloys (HEAs) containing multi-principal transition metals have attracted significant attention, exhibiting an unprecedented combination of strength and ductility owing to their low stacking fault energy (SFE) and large misfit parameter that creates severe local lattice distortion. Increasing both strength and ductility further is challenging. In the present study, we demonstrate via meticulous experiments that the CoCrFeNi HEA with the addition of the substitutional metalloid Si can retain a single-phase FCC structure while its yield strength (up to 65%), ultimate strength (up to 34%), and ductility (up to 15%) are simultaneously increased, owing to a synthetical effect of the enhanced solid solution strengthening and a reduced SFE. The dislocation behaviors and plastic deformation mechanisms were tuned by the addition of Si, which improves the strain hardening and tensile ductility. The present study provides new strategies for enhancing HEA performance by targeted metalloid additions.

論文

Effect of magnesium silicate hydrate (M-S-H) formation on the local atomic arrangements and mechanical properties of calcium silicate hydrate (C-S-H); In situ X-ray scattering study

Kim, G.*; Im, S.*; Jee, H.*; Suh, H.*; Cho, S.*; 兼松学*; 諸岡聡; 小山拓*; 西尾悠平*; 町田晃彦*; et al.

Cement and Concrete Research, 159, p.106869_1 - 106869_17, 2022/09

https://doi.org/10.1016/j.cemconres.2022.106869

被引用回数：22 パーセンタイル：89.36(Construction & Building Technology)

This study explored the effect of M-S-H formation on the local atomic arrangements and mechanical properties of C-S-H. The elastic moduli of the samples were calculated using shifted atomic distances (r) and d-spacings (d) acquired by applying an external load on the pastes during X-ray scattering experiments. The experimental results indicated that the crystal structure of C-S-H remained intact with MgCl $_{2}$ addition. At the highest Mg/Si ratio (Ca/Si = 0.6, Mg/Si = 0.2), change in the dominant phase occurred from C-S-H to M-S-H because the low pH environment hindered the formation of C-S-H and facilitated the formation of M-S-H. The elastic modulus decreased with increasing Mg/Si ratio up to 0.1 owing to both C-S-H destabilization and low M-S-H content in the samples. Conversely, the elastic modulus increased in the paste synthesized with the highest Mg/Si ratio because considerable M-S-H had formed, which exhibited a higher elastic modulus than C-S-H.

論文

Enhancement of electrical conductivity to metallization of Mn $_{3-x}$ FeO spinel and postspinel with elevating pressure

山中高光*; Rahman, S.*; 中本有紀*; 服部高典; Jang, B. G.*; Kim, D. Y.*; Mao, H.-K.*

Journal of Physics and Chemistry of Solids, 167, p.110721_1 - 110721_10, 2022/08

https://doi.org/10.1016/j.jpcs.2022.110721

被引用回数：1 パーセンタイル：9.25(Chemistry, Multidisciplinary)

高圧下中性子回折実験により、立方晶MnFeOスピネルと正方晶MnFeOはそれぞれ18GPaと14GPa以上でCaMnO型の構造に変化することが分かった。Mn $_{3-x}$ FeO固溶体の転移圧力はMn含有量の増加とともに低下することがわかった。放射光X線Mssbauer実験により、スピネル構造の四面体サイト(A)と八面体サイト(B)におけるFe $^{2+}$ とFe $^{3+}$ 分布が圧力によって変化することを明らかにした。MnFeOとMnFeOは常温ではフェリ磁性体である。CaMnO型相は常磁性であった。電気抵抗の温度依存性から、このスピネルはA,Bサイトのカチオン間の電子ホッピングによって電気伝導を起こす半導体であることが示唆された。圧力によってB-B間距離が短くなると、隣接するBカチオン間の電子移動度が大きくなり、伝導が促進される。MnFeOのBサイトにおけるFe $^{2+}$ とFe $^{3+}$ の占有率はMnFeOのそれよりもずっと大きいことが明らかになった。CaMnO型は金属相である。理論計算の結果、金属的な性質が確認され、Feのd軌道がMnのd軌道に比べて強く適合されていることがわかった。

論文

Work hardening behavior of hot-rolled metastable Fe $_{50}$ Co $_{25}$ Ni $_{10}$ Al $_{5}$ Ti $_{5}$ Mo $_{5}$ medium-entropy alloy; In situ neutron diffraction analysis

Kwon, H.*; Harjo, S.; 川崎卓郎; Gong, W.; Jeong, S. G.*; Kim, E. S.*; Sathiyamoorthi, P.*; 加藤秀実*; Kim, H. S.*

Science and Technology of Advanced Materials, 23(1), p.579 - 586, 2022/00

https://doi.org/10.1080/14686996.2022.2122868

被引用回数：6 パーセンタイル：50.48(Materials Science, Multidisciplinary)

Metastability engineering is a strategy to enhance the strength and ductility of alloys via deliberately lowering phase stability and prompting deformation-induced martensitic transformation. In this work, the martensitic transformation and its effect on the mechanical response of a Fe $_{50}$ Co $_{25}$ Ni $_{10}$ Al $_{5}$ Ti $_{5}$ Mo $_{5}$ medium-entropy alloy (MEA) were studied by in situ neutron diffraction under tensile loading. This work shows how great a role FCC to BCC martensitic transformation can play in enhancing the mechanical properties of ferrous MEAs.

論文

The High temperature gas-cooled reactor

Ftterer, M. A.*; Strydom, G.*; 佐藤博之; Li, F.*; Abonneau, E.*; Abram, T.*; Davies, M. W.*; Kim, M. H.*; Edwards, L.*; Muransky, O.*; et al.

Encyclopedia of Nuclear Energy, Vol.1, p.512 - 522, 2021/06

https://doi.org/10.1016/B978-0-12-409548-9.12205-5

高温ガス炉は、ヘリウムガス冷却、黒鉛減速の熱中性子炉で、優れた固有の安全性を有しており、発電のみならず、水素製造などの多様な熱利用に用いることができる。本資料は、高温ガス炉に関する解説を目的として、高温ガス炉の特徴に加えて、これまでの開発の経緯や実用化に向けた研究開発状況について説明する。

論文

Electromagnetic transitions of the singly charmed baryons with spin 3/2

Kim, J.-Y.*; Kim, H.-C.*; Yang, G.-S.*; 岡眞

Physical Review D, 103(7), p.074025_1 - 074025_21, 2021/04

AA2020-0757.pdf:1.74MB

https://doi.org/10.1103/PhysRevD.103.074025

被引用回数：11 パーセンタイル：64.01(Astronomy & Astrophysics)

スピン3/2のチャームバリオンの電磁崩壊過程をパイオン平均場を用いたカイラルクォークソリトン模型によって計算した。およびSU(3)の破れの効果を取り入れ、ヴァレンスクォークとスィークォークが遷移形状因子にどの程度寄与するかを定量的に調べた。の小さい領域では、スィークォークの効果がより大きくなること、SU(3)の破れはUスピン禁止遷移を除き、非常に小さいことを発見した。格子QCDおよび他の模型計算との比較を行った。

論文

Experimental evidence for common driving effects in low-energy fission from sublead to actinides

Schmitt, C.*; Lemasson, A.*; Schmidt, K.-H.*; Jhingan, A.*; Biswas, S.*; Kim, Y. H.*; Ramos, D.*; Andreyev, A. N.; Curien, D.*; Ciemala, M.*; et al.

Physical Review Letters, 126(13), p.132502_1 - 132502_6, 2021/04

https://doi.org/10.1103/PhysRevLett.126.132502

被引用回数：18 パーセンタイル：82.84(Physics, Multidisciplinary)

Isotopic distributions of fragments from fission of the neutron-deficient $^{178}$ Hg nuclide are reported. This experimental observable is obtained for the first time in the region around lead using an innovative approach based on inverse kinematics and the coincidence between the large acceptance magnetic spectrometer VAMOS++ and a new detection arm close to the target. The average fragment ratio and prompt neutron multiplicity are derived and compared with current knowledge from actinide fission. A striking consistency emerges, revealing the unexpected dominant role of the proton subsystem with atomic number between the = 28 and 50 magic numbers. The origin of nuclear charge polarization in fission and fragment deformation at scission are discussed.

論文

Development of negative muonium ion source for muon acceleration

北村遼; Bae, S.*; Choi, S.*; 深尾祥紀*; 飯沼裕美*; 石田勝彦*; 河村成肇*; Kim, B.*; 近藤恭弘; 三部勉*; et al.

Physical Review Accelerators and Beams (Internet), 24(3), p.033403_1 - 033403_9, 2021/03

https://doi.org/10.1103/PhysRevAccelBeams.24.033403

被引用回数：2 パーセンタイル：29.07(Physics, Nuclear)

低エネルギーミューオン源としてアルミニウム薄膜標的を用いた負ミューオニウムイオン(Mu $^{-}$ )源を開発した。Mu $^{-}$ イオン源の性能評価のためMu-イオンを生成する実験を行った。Mu $^{-}$ イオンの測定強度は入射ミューオン強度 $1.3times10^{6}$ /sに対して $(1.7 pm 0.3) times 10^{-3}$ Mu $^{-}$ /sであった。アルミニウム標的上での入射ミューオンに対するMu $^{-}$ イオンの比である生成効率は $(1.1 pm 0.2(textrm{stat.})^{-0.0}_{+0.1}(textrm{syst.})) times10^{-6}$ であった。このMu $^{-}$ イオン源はミューオン加速器の開発を促し、比較的簡便な装置による低エネルギーミューオン源の実用性を実証した。

論文

Effect of the difference in strength of hard and soft components on the synergetic strengthening of layered materials

Kim, J. G.*; Bae, J. W.*; Park, J. M.*; Woo, W.*; Harjo, S.; Lee, S.*; Kim, H. S.*

Metals and Materials International, 27(2), p.376 - 383, 2021/02

https://doi.org/10.1007/s12540-020-00657-1

被引用回数：10 パーセンタイル：49.25(Materials Science, Multidisciplinary)

Heterogeneous structured materials achieve a combination of high strength and extreme ductility due to synergetic strengthening driven by conditions in the interfacial region. Although the origin of synergetic strengthening has been revealed to be strain incompatibility in the interfacial region, the effect of the strength difference between hard and soft phases on strengthening has not been investigated well. In the work reported in the present paper, the effect of the difference in strength of the hard and soft phases on synergetic strengthening was investigated by conducting in situ neutron diffraction tensile tests. As a result, it was determined that the dislocation density in a layered sheet of high Mn (HMn) steel/interstitial free (IF) steel is higher than that in a layered sheet of HMn/low carbon steel. The big difference in mechanical properties between HMn steel and IF steel induces a high stress gradient and results in additional dislocations.

論文

Quasifree neutron knockout reaction reveals a small -Orbital component in the Borromean nucleus $^{17}$ B

Yang, Z. H.*; 久保田悠樹*; Corsi, A.*; 吉田数貴; Sun, X.-X.*; Li, J. G.*; 木村真明*; Michel, N.*; 緒方一介*; Yuan, C. X.*; et al.

Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02

AA2020-0819.pdf:1.29MB

https://doi.org/10.1103/PhysRevLett.126.082501

被引用回数：52 パーセンタイル：96.37(Physics, Multidisciplinary)

ボロミアン核であり中性子ハロー構造が期待される $^{17}$ Bに対する(,)反応実験を行った。断面積の運動量分布を分析することで、 $1s_{1/2}$ と $0d_{5/2}$ 軌道の分光学的因子を決定した。驚くべきことに、 $1s_{1/2}$ の分光学的因子は9(2)%と小さいことが明らかになった。この結果は、連続状態を含むdeformed relativistic Hartree-Bogoliubov理論によってよく説明された。本研究の結果によると、現在知られているハロー構造を持つとされる原子核の中で $^{17}$ Bはおよび軌道の成分が最も小さく、または軌道成分が支配的であることが必ずしもハロー構造の前提条件ではない可能性を示唆している。

論文

HM and THM interactions in bentonite engineered barriers for nuclear waste disposal

Gens, A.*; Alcoverro, J.*; Blaheta, R.*; Hasal, M.*; Michalec, Z.*; 高山裕介; Lee, C.*; Lee, J.*; Kim, G. Y.*; Kuo, C.-W.*; et al.

International Journal of Rock Mechanics and Mining Sciences, 137, p.104572_1 - 104572_19, 2021/01

https://doi.org/10.1016/j.ijrmms.2020.104572

被引用回数：16 パーセンタイル：84.30(Engineering, Geological)

放射性廃棄物を地層処分した際に、廃棄体やその周囲で起こる熱-水理-力学-化学が連成する現象を表現する連成モデルの開発と確証を目的に、国際共同研究「DECOVALEX 2019 (DEvelopment of COupled models and their VALidation against EXperiments 2019)」が実施された。DECOVALEX-2019の一つのタスクでは、スイスのモン・テリ岩盤研究所およびグリムゼル試験サイトで実施されている原位置試験(それぞれ、EB試験およびFEBEX試験)を対象とした解析課題であり、廃棄体定置後のベントナイト材料からなる緩衝材等の人工バリア及び岩盤を対象に緩衝材が不飽和から飽和に至る状態までの熱-水理-力学連成現象のモデル化に関する検討が行われた。このタスクでは4つのチームが様々なコンピューターコード、構成則を使用して水理-力学および熱-水理-力学の連成解析を実行し、計測データと解析結果の比較が行われた。本論文は、DECOVALEX-2019プロジェクトのこのタスクで得られた成果や課題等について取りまとめた論文である。

論文

Soft, skin-interfaced microfluidic systems with integrated immunoassays, fluorometric sensors, and impedance measurement capabilities

Kim, S.*; Lee, B.*; Reeder, J. T.*; Seo, S. H.*; Lee, S.-U.*; Hourlier-Fargette, A.*; Shin, J.*; 関根由莉奈; Jeong, H.*; Oh, Y. S.*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 117(45), p.27906 - 27915, 2020/11

https://doi.org/10.1073/pnas.2012700117

被引用回数：94 パーセンタイル：93.75(Multidisciplinary Sciences)

本研究では、汗のコルチゾール分析のための流動イムノアッセイ、グルコースとアスコルビン酸(ビタミンC)分析のための蛍光測定イメージング、および電極を使用した発汗速度のデジタルトラッキングを組み合わせた、ワイヤレス,バッテリー不要の皮膚インターフェースマイクロ流体システムを実現した。運動している被験者を対象とした体系的なテストにより、本開発デバイスが物理的ストレスと生化学的相関を追跡可能であることが示された。