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基于深度学习的CT心肌延迟强化后处理图像的降噪

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国际医学放射学杂志 2022年第6期45卷 734-735页

作者： T.Nishii T.Kobayashi h.Tanaka A.Kotoku y.Ohta y.morita 李晨菲

摘要为了改善 CT 心肌延迟增强（MDE）的影像质量，开发了一种基于融合 MDE CT 数据验证的深度学习（DL）的后处理降噪方法。目的以 MRI 晚期钆增强（LGE）为标准，评价

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Depositional condition of Paleoproterozoic Francevillian carbonate rocks revisited from rare earth element contents

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Geoscience Frontiers 2024年第3期15卷 31-49页

作者： satoshi yoshida Karen Bakakas Mayika yuki Ishihara Mathieu Moussavou hisashi Asanuma Tomohiko sato Takafumi hirata Cédric Ligna yusuke Sawaki Amboise Edou-Minko Department of Earth Science and Astronomy The University of Tokyo3-8-1 Komaba Meguro-kuTokyo 153-8902Japan Center for Northeast Asian Studies Tohoku University41 KawauchiAoba-kuSendai 980-8576Japan Department of Geology Universitédes Sciences et Techniques de MasukuBP:90190025 FrancevilleGabon Department of Earth and Planetary Science The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan Geochemical Research Center The University of Tokyo7-3-1HongoBunkyo-kuTokyo 113-0033Japan Graduate School of human and Environmental Studies Kyoto UniversityYoshida-nihonmatsuSakyo-kuKyoto 606-8501Japan Center for Fundamental Education Okayama University of Science1-1Ridai-choKita-kuOkayama CityOkayama 700-0005Japan

The Paleoproterozoic Francevillian Group in the eastern Gabonese Republic has been recently attracting increasing attention because it includes distinctive macroscopic structures interpreted as eukaryotic ***,its depositional setting and associated redox conditions need to be clearly *** clarify these,petrological studies and rare earth element(REE)abundances of carbonate rocks of the Francevillian Group in the Lastoursville basin were determined with ICP-MS coupled with a laser ablation sampling *** microscopic observations indicate that dolostones in this basin underwent the complicated diagenetic history,including sparitization,decomposition of organic matter,reduction of ferromanganese oxides,silicification,and later *** dolostones of lower Francevillian B(FB)Formation show heterogeneous textures formed by alterations during *** the alterations,changes of REE abundances and degrees of positive y anomalies appear to have *** indicates that REE signatures in carbonate rocks can vary during *** high Mn contents in the dolostones of upper FB Formation were derived from the reduction of ferromanganese oxides in *** signatures of REE abundance in dolostones can be explained by the mixing of seawater and ferromanganese oxide *** that sense,the dolostones inherited the trace element characteristics of precursor ferromanganese oxides even after the diagenesis.y/ho values of the most primary parts of each sample exceed 33,the newly determined threshold value for marine carbonate rocks based on our *** magnitude of the La anomaly values also falls within the range of that of holocene reefal *** indicate that a precursor of the dolostone of the Francevillian Group was deposited in a marine *** addition,presence of Ce anomalies in the upper FB Formation suggests that the Paleoproterozoic ocean was oxidized to such an ex

关键词： Carbonate diagenesis Francevillian Group LA-ICP-MS Seawater composition y/ho fractionation

通过深度学习重建冠状动脉CT血管成像检测支架再狭窄的可行性研究

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国际医学放射学杂志 2024年第3期 380-380页

作者： h.Kawai S.Motoyama M.Sarai y.sato T.Matsuyama R.Matsumoto 余芸菲

摘要目的 CT血管成像评价支架内再狭窄（ISR）仍然具有挑战性，特别是对于小支架。使用深度学习重建来量化支架支柱厚度和支架处的血管管腔直径，并将其与使用传统

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Friction stir spot welding of SPCC low carbon steel plates at extremely low welding temperature

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Journal of Materials Science & Technology 2019年第5期35卷 733-741页

作者： y.F.Sun h.Fujii y.sato y.Morisada Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki 567-004Japan School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China

Friction stir spot welding (FSSW) was applied to 2.0 mm thick steel plate cold-rolled commercial (SPCC) low carbon steel plates at a very low rotation speed that ranged from 5 to 50rpm, which was much lower than that generally used for the conventional FSSW technique. Due to the very low heat input, the welding processes could therefore be completed at a peak welding temperature below 160℃. As a result, a significantly refined microstructure with an average grain size of about 0.41μm was formed in the stir zone of the joints and the JI {0-11 } and J2{1-1O} shear textures were the dominant components, which are different from the D1{11-2} and D2{-1-12} shear textures formed in the conventional FSSW joints. In addition, no heat affected zone could be detected along the crosssectional plane of the joints. Although a few void-like non-bonded areas were still observed along the interface between the upper and lower steel plates, the shear tensile loads of the joints increased to about 10.0 kN when welded at a condition of 8t, 20rpm and 30 s, and the joints fractured through the plug failure mode.

关键词： Friction stir spot welding Dynamic recrystallization Microstructure Steel

Friction-stir welding and processing of Ti-6Al-4V titanium alloy:A review

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Journal of Materials Science & Technology 2018年第1期34卷 58-72页

作者： S.Mironov y.S.sato h.Kokawa Department of Materials Processing Graduate School of Engineering Tohoku University

In this work, the current understanding and development of fliction-stir welding and processing of Ti- 6Al-4V alloy are briefly reviewed. The critical issues of these processes are addressed, including welding tool materials and design, tool wea,, processing temperature, material flow, processing window and residual stresses. A particular emphasis is given to microstructural aspects and microstructure-properties relationship. Potential engineering applications are highlighted.

关键词： Ti-6Al-4V titanium alloy Friction-stir welding Friction-stir processing Microstructure Properties

Data-Driven Viewpoint for Developing Next-Generation Mg-Ion Solid-State Electrolytes

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电化学（中英文） 2024年第7期30卷 38-49页

作者： Fang-Ling yang Ryuhei sato Eric Jianfeng Cheng Kazuaki Kisu Qian Wang Xue Jia Shin-ichi Orimo hao Li Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan College of Physics Sichuan UniversityChengdu610065China Institute for Materials Research(IMR) Tohoku UniversitySendai980-8577Japan College of Materials Science and Engineering Sichuan UniversityChengdu610064China

Magnesium(Mg)is a promising alternative to lithium(Li)as an anode material in solid-state batteries due to its abundance and high theoretical volumetric ***,the sluggish Mg-ion conduction in the lattice of solidstate electrolytes(SSEs)is one of the key challenges that hamper the development of Mg-ion solid-state *** various Mg-ion SSEs have been reported in recent years,key insights are hard to be derived from a single literature ***,the structure-performance relationships of Mg-ion SSEs need to be further unraveled to provide a more precise design guideline for *** this viewpoint article,we analyze the structural characteristics of the Mg-based SSEs with high ionic conductivity reported in the last four decades based upon data mining-we provide big-data-derived insights into the challenges and opportunities in developing next-generation Mg-ion SSEs.

关键词： Data mining Magnesium-ion solid-state electrolytes All-solid-state batteries Magnesium-ion conductivity

深度学习和智能手机优化心肌晚期钆增强成像Look-Locker影像的抑制点

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国际医学放射学杂志 2023年第5期 619-619页

作者： y.Ohta E.Tateishi y.morita T.Nishii A.Kotoku h.horinouchi 张晓涵谷连元

摘要目的利用卷积神经网络（CNN）确定Look-Locker序列影像的最佳反转时间（TI），并探讨智能手机校正TI的可行性。方法回顾性收集2017—2020年期间1 113例Look-

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Plasma Confinement Characteristics in heliotron J——Spontaneous Change of Plasma Confinement State

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Plasma Science and Technology 2004年第4期6卷 2371-2376页

作者： T.Mizuuchi h.Okada K.Nagasaki S.Kobayashi S.yamamoto F.Sano K.Kondo K.hanatani M.Nakasuga y.Nakamura y.Suzuki y.Manabe h.Shidara h.Kawazome M.Kaneko y.Nishioka y.Ohno T.Takamiya h.yukimoto y.Fukagawa y.morita S.Nakazawa S.Nishio K.Takahashi S.Tuboi M.yamada K.Ohashi y.Ijiri T.Senju K.yaguchi K.Sakamoto K.Tohshi M.Shibano T.Obiki Institute of Advanced Energy Kyoto UniversityUji 611-0011Japan Graduate School of Energy Science Kyoto UniversityUji 611-0011Japan

Spontaneous transition of the plasma confinement mode was observed in thehelical-axis heliotron device 'heliotron J' for three different plasma heating schemes, ***-only, NBI-only and the combination of ECh and NBI. The transition seems to occur above a certaincritical density. In addition to the confinement transition, a spontaneous shift of the hittingposition of the divertor plasma flux on the wall was observed. This shift could be related with thechange of the edge field topology caused by non-inductive toroidal currents.

关键词： heliotron J plasma confinement transition phenomena

Analytical Investigation of Prior Austenite Grain Size Dependence of Low Temperature Toughness in Steel Weld Metal

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Journal of Materials Science & Technology 2012年第3期28卷 241-248页

作者： X.F. Zhang P. hall h. Terasak M. sato y. Komizo Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 56%0047 Japan Technical Development Department Welding Business Kobe Steel Ltd. 100-1 Miyamae Fujisawa Kanagawa 251- 8551 Japan

Prior austenite grain size dependence of the low temperature impact toughness has been addressed in the bainitic weld metals by in situ ***,decreasing the grain size is the only approach by which both the strength and the toughness of a steel are ***,low carbon bainitic steel with small grain size shows a weakening of the low temperature impact toughness in this *** direct tracking of the morphological evolution during phase transformation,it is found that large austenite grain size dominates the nucleation of intragranular acicular ferrite,whereas small austenite grain size leads to grain boundary nucleation of *** kinetics information will contribute to meet the increasing low temperature toughness requirement of weld metals for the storage tanks and offshore structures.

关键词： In situ observation Prior austenite grain size Low temperature toughness Intragranular nucleation Grain boundary nucleation